The rock-breaking tool
(57) Abstract:The invention is intended for use in mining and earth-moving machines to equip their working bodies. Rock cutting tool made of steel wheels with hamartoblastoma elements and basic structure of sorbitol vacation. The tool includes a shank and a wedge-shaped working part. On the front surface of the working part, having a wave-like form, are electrodes-energizers and stabilizer with resonator. On the rear surface of the wave form are Wycliffe element and shaped longitudinal groove offset from the longitudinal axis of symmetry of the flow divider. The depth of deflections before and after the second cycloid front and rear wavy surfaces different in different runs rock cutting tool. When the tool is executed for monolithic rock these values are respectively 0,4; 0,75; 0.75 diameter of the circle that forms the specified cycloid and equal 9-20 mm When the tool is executed to loose weight breed these values are respectively 0,6; 1,0; 1,0 diameter of the circle that forms the specified cycloid and is 14 - 56 mm Tool allows you to increase Scot used to equip the working bodies of the mining and earthmoving machinery.Famous rock cutting tool steel wheels with hamartoblastoma elements sorbitol structure including a shank and a wedge-shaped working part formed in the front surface of the wave form, which are electrodes - energizers and stabilizer, side surfaces, which are flow energizers, and rear wavy surface on which are Wycliffe element and shaped longitudinal groove with an ultrasonic generator and an additional inclined slots in the diffuser part. (See, for example, patent of Russia No. 2001264 from 1993 CL E 21 C 25/38).The disadvantage of analogue is that impossible unification tool for the effective destruction of all kinds of rocks: Sandstone, Apatite, iron ore, diabase, copper ore, etc., because the tool cannot adjust its geometry during operation to the physical and mechanical properties of different breeds. Secondly, the interaction of rocks with high plasticity: clay, loam, frozen and wet sand, coal, shale, and mechanomyography rock - mass is weakened, for example by an explosion, leading to periodic storenum working bodies of mining machines. l due to polarization processes. Sufficient elasticity and plasticity of single crystals prevents the development of low-cycle fatigue fracture from the applied shear stress. In addition to fracture of ductile single crystals requires the application only at the critical point the shear stress with the fluctuation in 2 to 3o(See, for example, patent USSR N 720174 1979 to CL E 21 F 13/08). Since the electrode - energizers do not have the required dimensions for the application of force at the critical point and thus have a higher Flexural rigidity, which does not allow to apply shear stress fluctuation in 2 to 3othe operators of excavators and bulldozers when stopping forced to periodically change the angle of engagement of the tool with the array to a new stall, usually 1.0 to 1.5 m Experienced drivers during excavation and digging constantly changing 2 to 3othe angle of interaction, not to bring the work equipment to stall. Therefore, the prior art from the viewpoint of durability is insufficient, as it does not provide unification, that is, adjustment of the geometry of the tool to various physical and mechanical properties of rocks and there is the destruction of ductile single crystals.Novoobrazovanii elements sorbitol patterns, including a shank and a wedge-shaped working part formed in the front surface of the wave form, which are electrodes - energizers and stabilizer with resonator, the side surfaces, which are flow energizers, and the rear surface of the wave form, which are Wycliffe element and shaped longitudinal groove offset from the longitudinal axis of symmetry of the flow divider in the confused part of the groove and with an ultrasonic generator and more inclined grooves in the cone part of the figure of the longitudinal groove. (See, for example, patent of Russia No. 2052102 from 1996 to CL E 21 C 35/38.)
The disadvantage of the prototype is that though and provides adjustment of the tool geometry to physical and mechanical properties of the destructible rocks at the wear of the working parts of the tool along the length, but it is quite slow. When switching on the interaction with different breed on 4oand more on the angle of internal friction of the process of adjustment is delayed until almost come to a full resource tool in length. Despite the presence of a specific profile, namely likelihooda surface and electrode, turbulizer, provide periodically goes with the destruction of Vicolo on fracture by cleavage and destruction of the cutting. This is because on the one hand the tool bucket excavators and bulldozer rippers periodically substantially change the angles of interaction: 50 - 70owith the mass of the face, namely the transition from implementation - horizontal section length of 2 to 5 m to the drawing - curved trajectory excavation length of 10 - 12 m or when switching from a burial - plot path length of 0.5 - 3.0 m to the Ripper is a horizontal section of a length of 20 to 200 m on the other hand, due to a significant increase in the Flexural rigidity of a working part of the tool in the process of wear and tear in length. This means misalignment resonance frequency of the working part of the tool with the frequency of the shear stresses generated by the engine high pressure volumetric stress state - DD (plane strain), formed in front of the instrument. The consequence specified is increasing the intensity of destruction, and thus reducing the durability of the tool.Secondly, because the rocks with the hardness of the scale Protodiakonov 0.5 to 7.0 and with angles of internal friction from 16 to 38opredisposed to the formation of ductile single crystals, not to mention methanomethylovorans breed, when working IKI prototype in comparison with the prior art analog, and even more serial of tool with a wedge-shaped profile made the prototype of the prior art is insufficient, as it requires the creation of a device, autoregulates Flexural rigidity of a working part of the tool, for quick adjustment of geodynamic settings of the instrument to the physical and mechanical properties destructible rocks; and you want a device that provides shear deformation with fluctuations at the critical point of plastic crystals formed in front of the instrument.The achievement of high level of technology possible when portarray tool steel wheels with hamartoblastoma elements sorbitol structure includes a shank and a wedge-shaped working part formed in the front surface of the undulating shape with depths of depression brachistochrone before and after the second cycloid, respectively, when interacting with metamorphizing rock (monolith): 0.4 and 0.75 diameter, forming a specified cycloid circle*= 9 - 20 mm, when interacting with methanomethylovorans breed respectively: 0.6 and 1.0 in diameter, forming a specified cycloid circle*p= 14 - 56 mm, which is the electrode - turbulization the second diameter forming its range, that is, respectively, when interacting with the monolith or weakened by mass, equal to: HPD.m.=*and HPD.about.= *pand limited by the length of the perpendicular height h1=*restored from the longitudinal axis of symmetry and the stabilizer with the resonator, the side surfaces which are flow energizers and the rear surface wave form with a deep bend of brachistochrone 0.75 diameter, forming a second cycloid circle*= 9 - 20 mm when interacting with the monolith and 1.0 in diameter, forming a second cycloid front surface of the circle*p= 14 - 56 mm when interacting with a weakened lot, which are Wycliffe element and shaped longitudinal groove offset from the longitudinal axis of symmetry of the flow divider in the confused part of the groove and with an ultrasonic generator and an additional inclined slots in the diffuser part figured longitudinal groove.The invention consists in the following. Low-frequency 2 - 8 Hz interaction tool with a breed defined by the actuator mining machine, causes the breed when focusing the reflected ultrasonic energy from the metal tool education now is type: COOH-and OH-and, the cumulative jet, the latter in turn form a toroidal resonators and the second core high blood pressure. The polarization of the sealed mass of rocks leads to a change in clutch hydroxyl groups OH and carboxyl COOH determining the dipole moment of the molecules and their high mechanical strength, and also leads to the appearance of surface waves Rayleigh, investigation processes repackaging and density changes of phases. Since connections polar OH groups-, NH-and COOH-have a light tail atom, the process of polarization increases the frequency of these compounds. At the time of kropyvnia cavitation bubbles polar groups that migrated to the area of the sliding surfaces, is achieved plasma frequency absorption of 20 to 60 kHz, changing dipole moment and causes the increase of the amplitude of the shear stresses in accordance with theory of R. E. Peierls. The level of energy breaks the valence and the covalent bond that disintegrates the layer of rock thickness up to 2 in the area of the sliding surfaces of the shell aggregated ellipsoid and thereby separates a piece of rock in the form of aggregated ellipsoid from an array of face for a moment before destruction, predstavlyaet shear stress-separationSD.-o.
At high plasticity instead of aggregated ellipsoid formed plastic crystal, for the destruction of which high-frequency vibration, strictly organized in time and space, lack of need application fluctating shear stress-separation at the critical point PD. To prevent the formation of single crystals P. A. Micerium was tested automatic control for periodically changing the angle of interaction bucket excavators with rock. To ensure low-cycle fatigue fracture of rocks, including viscous plastic single crystals by application generated by the engine high pressure PD with frequency 1700 to 2700 Hz shear stress, separation, W. M. Berman was applied volume with hydraulic accumulators, which stretched the time of interaction of the tool with the array. A significant decrease in coefficient of friction-sliding and translation of friction-sliding friction-rolling in the boundary layer on the instrument through the use of cycloidal-brachistochronic surfaces providing different kind of turbulization, also reduces the frequency of storani. The analysis of this phenomenon showed that sosaku the instrument is a device on the autoregulation of its own oscillation frequency due to a change in Flexural rigidity and provides an oscillating mass by the formation and subsequent migration of gaseous metal in the Knudsen layer. This device only works when the misalignment is generated by frequency shift separation of fowith its own frequency finworking part of the tool 5 - 30%. With the aim of strengthening the process of formation of hot gaseous metal when applying high-frequency modulation voltage in the skin layer of the metal and its subsequent transfer to the Knudsen layer, cycloidal-brachistochronic wedge-shaped profile of the working part of the tool has been adjusted. Subtle tuning fsinto foprovided metal milling a series of vortex rings in the diffuser. In accordance with the above, the depth of brachistochrone front and rear surfaces were adjusted so that the resonant length of the instrument was determined by the difference between the length of the instrument to the zone of thermal weakening and the lengths of the projections on the longitudinal axis of symmetry of the segments obtained between points brachistochrone front surface in contact with the tangent, the inclination to the longitudinal axis of symmetry are equal , and the points of intersection of these tangents with the tangent to the circles of constructing the sock back surface and to brachistochrone rear surface, the inclination to the longitudinal axis of symmetry ravetta on frequency modulation finin the skin-layer metal tool that intensifies the formation of hot gaseous metal brachistochrone to a level that allows stable autoregulating Flexural rigidity of a working part of the tool. The latter is due to the decreasing height of the cross section of the working part of the tool during operation, when the working part from wear and tear is reduced in length. In other words the ratio of the average height of the cross section to the length of the working part is provided by the constant, while the serial tool this ratio sharply increases during operation. (Reference: operation-technology import tool regulates periodic remounting to replace the front surface to the rear, which to some extent corrects the situation).The proposed geometry significantly reduces the resistance to the introduction of the tool in the array, providing a stable fracture rocks vicola, i.e. with minimum energy consumption without locking modes. To ensure the tool works without locking modes simultaneously is proposed to replace the first electrode - turbulization front surface on the elongated, low frequency oscillations instra viscoplastic single crystals, that will, at least, to shift to smaller parts of the single crystal relative to each other. This violation of the integrity of the single crystal in accordance with law, C. Wolfe dramatically increases the surface energy of the crystal and causes it to crack with the formation of gaseous products of disintegration. The condition of the shift in the single crystal is an imposing cylindrical symmetry of uniaxial compression on the symmetry of the crystal at the point most stable structures, repeated by B. M. Labove in their geometric series with denominator q-o6where qo= 1,26. As well as the minimum radius that defines the depth of the skin layer polarization processes in the crystal, RDD=0,25 l*then the critical point is the most stable structures is at the height of the perpendicular, recovered from the longitudinal axis of the tool, namely h= RDDq-o6=*.To optimize mentioned elongated electrode turbulizer should be aware that when its dimensions, height equal to HPD.m.= 51*I.m.Re-1-to1*or HPD.about.= 51*I.about.Re-1is trated mass, obtained by the interaction of the tool with the monolith or weakened by mass, dramatically increases the pressure directly in front of him, which increases the viscosity of the resulting turbulent flow, which provides intensive absorption of polar groups, which are surface-active substances (surfactants). If surfactants in normal conditions instantly migrate into the intergranular space of the metal tool and krupkova its surface layer, the height significantly interfere with this process, while reducing the resistance movement. Translation of a laminar flow into turbulent possible for almost all known species in the numbers of O. Reynolds Re > 2300.It should be noted that the length of AP for methanomethylovorans rocks exposed to uniaxial compression, equal to a constant value of l*= 0,23684 m, while the length of the PD metamorphizing breed varies from 0,21 to 0.15 m depending on the angle of internal friction, varying respectively from 48 to 16o. The main value that defines the process of destruction and force the implementation of the instrument in the breed, is the shear stress, separation. Said value, repeatedly opredelyau is when determining toughness helped to develop an algorithm of calculation for all physico-mechanical properties of fractured rocks, required to calculate the optimal geometry protorosaurs tool based on two parameters: the angle of internal friction and density of the breed. For a more complete understanding of the invention offers an example of the calculation of the proposed options on the basis of the specified algorithm for crowns Ripper dozer type T-35.01 (T-500), interacting with the monolith Apatite, and tooth bucket excavator EKG-10 interacting with methanomethylovorans Apatite (see table, where*- the angle of internal friction of the breed;*- maximum power angle E. H. Pasino;*- - minimum energy angle of internal friction by E. H. Pasino; Z*- the minimum angle of polarization;*- the maximum angle of polarization*- vibration friction angle;p- coefficient S. D. Poisson;*p- Poisson's ratio at the time of destruction of rocks by A. N. Zelenin; l*- length of the flat deformation - DD methanomethylovorans breed before the time of destruction; h*- the basic height of the PD methanomethylovorans breed; h**- the basic height of the PD metamorphismaare circle K. F. Mora, defines the limit of the tensile strength;*withJ.- diameter of circle K. F. Mora, determining tensile strength of rock under compression, and the length of the PD metamorphizing breed;*I.mthe diameter of the core of high pressure J. C. Boussinesq for metamorphizing breed;*the diameter of the compact vortex turbulizing layer or the thickness of the boundary layer of the dispersed mass; n*the thickness of the captured methanomethylovorans layer breed or full height DD metamorphizing breed;*withD.-o- vector shift separation at a speed of implementation of 0.1 m/s, which corresponds to the magnitude of the translation vector separation at the maximum power angle; k*Ithe vector of intensity of a spherical tensor hydrostatic pressure; k*the vector of intensity of the stress deviator; T*ethe vector of intensity tensor destructive voltage reflecting the totality of the ball tensor hydrostatic pressure and deviator stress. (The angle between the k*Iand k*90o. When determining the mechanical properties of the rock T*e.90taken ine= 90o);e- the coefficient of mechanobiological by T. I. Berman; K*cthe speed ratio at*;*c- the vector that determines the voltage coupling; *pol.- the vector which determines the magnitude of polarization; V*- speed deformation; P*c- coefficient of the boundary layer; P*to- the coefficient of viscosity sublayer Knudsen; R*p- coefficient of turbulence; V*/n*the velocity gradient; LN. O. S.- the average length of a piece methanomethylovorans breed in the destruction of her cleavage; CF.- the phase velocity; LMs. O. R.- the average length of a piece methanomethylovorans breed destroyed by cutting; LN. M. S.- the average length of a piece metamorphizing rocks, destroyed by cleavage; LMs. M. R.- the average length of a piece metamorphizing breed destroyed by cutting; fO.- frequency ripple voltage shift-margin generated by the engine high pressure J. C. Boussinesq on the basis of the effect of piezoelectricity by A. C. Berman; fO.- frequency of absorption (emission) of energy in the resonator, L. Helmholtz by R. Taylor; FR.- the cross-sectional area of the neck of the resonator; VI.g.the volume of gas in the core of the high pressure J. C. Boussinesq, resulting pitoeff methanomethylovorans breed in the destruction of its demolition; fMs. O. R.- the average frequency of PD methanomethylovorans breed in the destruction of her cutting; fN. M. S.- low frequency PD metamorphizing breed in the destruction of her cleavage; fMs. M. R.- the average frequency of PD metamorphizing breed in the destruction of her cutting; C*L.p- the velocity of the longitudinal ultrasonic waves in the array at the maximum compression of the pores, i.e. at a pressure of 50 to 70 MPa for A. C. Berman; Tfrom.the time that determines the density ripple radiated kinetic energy;pdensity of rocks; - kinematic viscosity boundary layer of the dispersed mass; is the dynamic viscosity laminar boundary layer;SD.-o- shear stress-separation for rock breaking by A. C. Berman (equation obtained on the basis of the conditions of fluidity I. Newton);SD.-o- shear stress-separation for destruction metamorphizing breed (the Equation is based on the density of the radiation kinetic energy in time) by A. C. Berman, and D. C. Berman; fromthe radiation density of the kinetic energy of oscillating in a sinusoidal manner, by M. A. Lavrentiev;fromthe radiation density of the kinetic energy at the time when the generation voltage of duracrete rocks under uniaxial compression; Ky- coupling coefficient;p- the tensile strength of rocks under tension; I.about- tensile strength shear ball core surface high pressure when cranking in PD methanomethylovorans breed; I.m- tensile strength shear ball core surface high pressure when cranking in PD metamorphizing breed (the monolith); - tensile strength shear spherical surface turbulizing vortex when turning it in PD metamorphizing breed; c- power clutch, N. N. Maslova, a set of plastic adhesion due to water-colloidal reversible ties and structural rigid couplings due to the strength of cementation-crystallization relations, irreversible at fracture;floor- voltage polarization forming the magnitude of the coupling; C*L.p- the velocity of the longitudinal ultrasonic waves in a compact array metamorphizing breed at al.D. Berman; U - velocity shift in the oncoming flow; U*- speed shift asymmetrically cut the oncoming flow by A. C. Berman; CR- the speed of surface waves by j..The Rayleigh; EArt. p.- modulus of elasticity poro is tion of elasticity; GPD.module shift in DD metamorphizing rock on, M Asciano; G*- the shear modulus in the layer of dispersed mass in laminar flow, the K - module a comprehensive three-dimensional elasticity; Cs.p.- the speed of transverse waves in DD; d*a.C- - the average diameter of the abrasive grains formed during sintering breed when piezoeffect in the area of netmate in the nucleus increased pressure on D. C. Berman; d*c.C- diameter subzero breed on An.D. Berman;*- kinematic viscosity turbulizing layer;*- dynamic viscosity turbulizing layer; Re.is the number 0, the Reynolds;to- the ratio of the resistance movement in friction-rolling vortices turbulizing layer N. The Blasius;cthe coefficient of resistance to movement of the friction-slide by A. N. Soboleva; TB. N.the time of absorption of electromagnetic energy; DD- the relaxation period PD metamorphizing breed;*the period of relaxation dispersed mass in D. K. Maxwell; fP. C.- frequency ripple turbulizing vortices by O. A. Berman; Sp. N.the surface tension of vortex rings; lp. N.- the perimeter of the arc of contact turbulizing C dispersed mass and gaseous products of disintegration; W*e- the Weber number for flow spiral twisted;p. b- the density of rocks in the cumulative jet from N. E. Sobolev;p. b- the density of the rock in the core of high pressure in accordance with the views of J. C. Boussinesq;*the main angle of the front surface (the inclined N1) to the axis of symmetry; 2*the main angle of the rear surface (the inclined N2) to the longitudinal axis of symmetry; L1.m.; L1.about.- the distance along the inclined No. 1 to the top of the 1st cycloid front surface. In this case and hereinafter, the first value refers to the instrument bulldozer interacting with the monolith - metamorphizing breed, the second value refers to the instrument excavator, interacting with weak mass - methanomethylovorans breed; lN. m; lN. O.- cut, cut perpendicular to the longitudinal axis inclined from N 1; L*2.m.; L*2.o.- cut along the inclined N 1 from the perpendicular to the longitudinal axis of symmetry to the inclined projections on N1 vertices of the 1st brachistochrone front surface; L2.m.; L2.about.- cut inclined N1 to the projection on it of the top of the 1st brachistochrone; L3.m; L3.about.4.m.; L4.about.- cut inclined N1 to the projection on it of the top of the 2nd brachistochrone; L*4.m.; L*4.o.- cut inclined N1 from the perpendicular to the longitudinal axis of symmetry to the projection on it of the top of the 2nd brachistochrone; L5.m.; L5.about.- cut inclined N1 to the zone of thermal weakening; L*5.m.; L*5.o.- cut inclined N1 from the perpendicular to the longitudinal axis of symmetry of the zone of thermal weakening; DB; DE.- height of seat tool that determines the length of the zone of thermal weakening; L6.m.; L6.about.- cut inclined N1, determining the optimal length of the working part of the tool; L**4.m; L**4.o.- cut longitudinal symmetry axis to the projection of the vertices of the 2nd brachistochrone front surface; L**5.m; L**5.o.- is the length of the longitudinal axis of symmetry of the zone of thermal weakening; L**6.m; L**6.o.- the length of the working part of the tool; the height of the upper part of the sock instrument; the height of the lower part of the sock instrument; h0.m.; h0.about.- height sock tool; distance midodrine the symmetry axis to the top of brachistochrone rear surface; h4.m.; h4.about.- height cross section of the tool between the vertices of the 2nd brachistochrone front surface and brachistochrone rear surface; h*4.m.; h*4.o.- the height of the tool in the area of the top of the 2nd brachistochrone the front surface and the rear surface taking into account the depth of the diffuser; the height of the perpendicular from the vertex of the 3rd cycloid front surface to the longitudinal axis of symmetry; the magnitude of the perpendicular, recovered from the longitudinal axis of symmetry from the beginning of the zone of thermal weakening inclined to N2; h5.m.; h5.about.the magnitude of the perpendicular to the longitudinal axis of symmetry in the area of the top of the 3rd cycloid front surface between the inclined N1 and N2; h*5.m.; h*5.o.- height cross-section in the area of early thermal weakening; C*L.INF.- longitudinal ultrasonic velocity in the metal of the tool;INF.the density of the metal of the tool; E*andN.- the modulus of elasticity of the metal of the tool at a temperature corresponding to point P. Curie (TK.= +768oC); PR. B.- the resulting maximum force on canine bulldozer; PArt. b- force locking bulldozer; PR. E.- the result is/SUB>.E.effective net force on the bucket; mso- weight of the tractor; mR.weight Ripper; mB- weight of the bulldozer; P*p.B.effective net force on canine bulldozer;from.- the voltage that determines the tensile strength of the metal of the tool during the bending;century- tensile strength metal tool under tension;-01the fatigue limit of the metal at high tension with the asymmetry of the cycle of 0.2; W4.To.B.; W4.To.E.- constructive Equatorial moment resistance of the cross section of the tool in the area of the top of the 2nd brachistochrone front surface; W4.M.B.; W4.M.E.- maximum mechanical moment of resistance in the area of the top of the 2nd brachistochrone front surface; b4.B.; b4.E.- the width of the tool in the area of the top of the 2nd brachistochrone front surface; W5.To.B.; W5.To.E.- constructive Equatorial moment resistance of the cross section of the tool at the beginning of the zone of thermal weakening; W5.M.B.; W5.M.E.- maximum mechanical moment of resistance in the area of the top of the 3rd cycloid front surface of the working part of the tool; b4.B. F.;b4.E. F- the actual width of the tool is required inventory of structural strength in the area of the top of the 2nd brachistochrone; W4.To.B. F./W4.M.B.; W4.To.E. F./W4.M.E.the actual factor of structural strength; W5.To.B./W5.M.B.; W5.To.E./W5.M.E.- coefficient of an adequate supply of constructive moment of resistance in the zone of thermal weakening; b5.B.; b5.E.- the minimum required thickness of the tool in the zone of thermal weakening; b5.B. F.; b5.E. F.the actual thickness of the tool in the zone of thermal weakening; W5.To.B. F./W5.M.B.; W5.To.E. F./W5.M.E.- the actual factor constructive moment of resistance in the weld zone weakening: hcf. b; hcf. E.- the average height of the working part of the tool without taking into account the longitudinal shaped groove; lR. D. m; lR. D. O.resonance length of the working part of the tool; lM. B.; lO. E.- reduce the length of the working part of the tool by reducing the above oscillating masses of 1.57 times as alternating maximum and minimum design moments of resistance on length increases its resistance to low-cycle fatigue fracture; reducing the length of the working part of the tool in the area of the 1st brachistochrone the front surface due to Opti tool in the area of the 2nd brachistochrone front surface; j*CIR.- the quantity that determines the angles between the longitudinal axis of symmetry and tangent to the 1-th and 2-th brachistochrone front surface; i*barts.- the quantity that determines the angles between the longitudinal axis of symmetry and tangent to the binding circles sock and brachistochrone rear surface; L7.m.; L7.about.- cut along the inclined N 2 from the tangent to brachistochrone rear surface to the intersection with the perpendicular, which is simultaneously tangent to the generating circle at the end of the first cycloid front surface; H1.m.; H1.about.- the amount of deflection of the 1st brachistochrone the front surface, for maximum reduction of the oscillating mass of the tool; H4.m.; H4.about.- the amount of deflection of the 2nd brachistochrone for maximum reduction of the oscillating mass; H*4.m.; H*4.o.- the amount of deflection brachistochrone rear surface, providing maximum reduction is given an oscillating mass; bcf. b; bcf. E.- the actual average width of the tool: JB; JE.- Equatorial moment of inertia of the cross section of the tool in the area of early thermal weakening; CI. J. B.;army fluctuations; mB; mE.- weight of the instrument on the basis of the resonant length; m*b.; m*e.- the weight of the instrument on the basis of the resonant length;Jn.B.;Jn.E.cyclic oscillation frequency of the working part of the tool; fJn.B.; fJn.E.frequency fluctuations of the working part of the tool; q0the denominator exponentially for large size pieces of destroyed rock by B. M. Labove; RPD.- the minimum radius that defines the depth of the skin layer polarization processes in single crystal by G. N. Soboleva; h- overall dimension along the height of the most stable structures that make up the main crystal; HPD.M.; HPD.About.- size obstacles dispersed mass in height, providing sustainability education turbulizing process for this obstacle.A search for sources of patent and scientific and technical information showed that the combination of all the essential distinguishing features of the claimed invention is not known, therefore, the technical solution meets the requirement of "Novelty", as it is not known from the prior art.When the definition developed in the well-known features in conjunction with the distinctive features of the proposed technical solution meets the criterion of "Inventive step" because of the significant differences.It is possible to achieve a high degree of progressivity: an increase in resource 1.6 - 2.3 times in comparison with the resource of the prototype at almost the same cost of production, therefore, the invention meets the criterion of "Practical application".The invention is illustrated by drawings.Fig. 1. General view of the claimed invention. (Notation: upper numbers refer to the tool rippers, dozers, interacting with monolith rocks, bottom - to tool for excavator buckets interacting with weak mass, 1 - shank, 2 - operating part 3 - the front surface of the wave-shaped, 4 - deflection H1.m.= 0,4*a 5 - deflection H1.o.= 0,6*p.6 deflection H4.m.= 0,75*7 - deflection H4.o.= 1,0*p., 8 - brachistochrone N 1 tool that interacts with the monolith, 9 - brachistochrone N 1 tool that interacts with methanomethylovorans weight: 10 - brachistochrone N 2 tools that interact with metamorphizing breed 11 - brachistochrone N 2 tool interacting with a weakened lot, 12 - cycloid N 2 tools of Ripper dozer, 13 - cycloid N 2 tools of the excavator bucket, 14 - diameter*pthe Mohr's circle that defines the tensile strenght tensile, 17 - circle, forming a cycloid N 2 tools of the excavator bucket, 18 - first elongated electrode turbolister, 19 second electrode turbolister the front surface 20 to the third electrode turbolister, 21 - the height of the first elongated electrode turbulizer when interacting with the monolith of rock HPD.m.= 51*I.m./Reto*22 - height of the first elongated electrode turbulizer when interacting with mechanosorptive mass slaughter HPD.o.51*I.o./Reto*pthe 23 - height perpendicular limiting the length of the first elongated electrode turbulizer h= RPD.q-o6, 24 - longitudinal axis of symmetry, 25 - stabilizer, 26 - resonator stabilizer, 27 - lateral surface 28 is a flow energizers, 329 - rear surface wave-shaped, 30 - deflection H*4.m.= 0,75*31 deflection H*4.o.=*pa 32 - Wycliffe item 33 - shaped longitudinal groove 34 to the flow divider, 36 - ultrasonic generator, a 37 - additional inclined grooves).Fig. 2. Profile working part pomodori. (Legend: 1 - shank, 2 - operating part 3 is the front surface, 4 - deflection tool Ripper dozer before cycloid N 2, 5 - deflection tool bucket before cycloid N 2, 6 - deflection tool Ripper dozer after cycloid N 2, 7 - deflection tool bucket after cycloid N 2, 8 - brachistochrone N 1 tool bulldozer, 9 - brachistochrone N 1 tool excavator, 10 - brachistochrone N 2 tool bulldozer, 11 - brachistochrone N 2 tool excavator, 12 - cycloid N 2 tool bulldozer, 13 - cycloid N 2 tool excavator, 14 - diameter*turbulizing vortex 15 - circle that defines the tensile strength shear spherical surface turbulizing vortex when turning it in PD metamorphizing breed, 16 - diameter*pthe Mohr's circle that defines the tensile strength metamorphizing breed tensile, 17 forming the circle of the cycloid N 2 tools of the excavator bucket, 18 - first elongated electrode turbolister, 19 second electrode turbolister, 20 - the third electrode turbolister, 21 - height elongated electrode turbulizer to interact with the monolith HPD.m.*22 - height of the first e is perpendicular, limiting cycloidal curve elongated electrode turbulizer h= RPD.q-o6, 24 - longitudinal axis of symmetry, 25 - stabilizer, 26 - resonator 27 - lateral surface 28 is a flow energizers, 29 - rear surface wave-shaped, 30 - deflection of the rear surface of the instrument bulldozer H*4.m.= 0,75*31 deflection of the rear surface of the instrument excavator H*4.o.=*pa 32 - Wycliffe item 33 - shaped longitudinal groove 34 is an ultrasonic generator, a 37 - additional inclined grooves 38 - diffuser part figured longitudinal groove, 39 - area collapse, 40 - core profile of high pressure generating shear stress - separation in plane strain monolith, 41 - seal in the form of ellipsoid arising under plane deformation in the monolith of rock, 42 - seal in the form of a viscoplastic crystal, analog ellipsoid arising under plane deformation in methanomethylovorans breed, 43 - diameter*I.m.engine high pressure in the ellipsoid PD, 44 - component of the single crystal with the most stable dimensions, 45 - a critical point at the base of the single crystal at the height of Miniaplicativo after partial cracking of the seal of the viscoplastic crystal and generating shear stress - separation, 47 - diameter*I.about.engine high pressure that occurs after partial cracking viscoplastic crystal under plane deformation, 48 - a series of vortex rings 49 - turbulizing layer on the front surface, 50 - sublayer Knudsen, 51 - piece inclined No. 1, held at an angle*the zone of thermal weakening of the L5.m.= 1,5*I.m.+0,5*withJ.for a tool that interacts with the monolith, 52 - piece inclined No. 1, held at an angle*to the longitudinal axis of the zone of thermal weakening of the L5.o.= 2*I.about.+l*tool, interacting with weak mass, 53 - segment slant N 1 L4.m.= 1,5*I.m.+0,25*withJ.to the projection on it of the top of the second brachistochrone tool bulldozer, 54 - inclined segment N 1 L4.o.= 2*I.about.+0,5*I.m.to the projection on it of the top of the first brachistochrone when interacting with the monolith, 56 - segment slant N 1 L2.o.= 1,25*I.about.to the projection on it of the top of the first brachistochrone when interacting with weak mass, 57 - angle*= 0,25*for what I 0,67 DB, 59 - the length of the zone of thermal weakening of the tool bucket excavator, equal to 0.67 De, 60 - angle j*= 3*determining the slope of the tangent to the first brachistochrone, 61 - cut , which reduces the resonant length of the tool bucket due to the optimum deflection, 62 - cut , which reduces the resonant length of the tool bucket due to the optimum deflection, 63 - angle j*= 3*tangent to the second brachistochrone, 64 - reduce the length of the working part of the tool bulldozer at optimal deflections to calculate the resonant length: 65 - reduce the length of the working part of the tool bucket in the area of the second brachistochrone, 66 - cut brachistochrone rear surface of the instrument bulldozer, 67 - cut brachistochrone rear surface of the tool bucket, 68 - piece slant N 2, held at an angle 2*to the longitudinal axis of symmetry of L7.m.=*withJ., 69 - segment slant N 2 for tool bucket L7.o= 1.5 l*determining the touch point of brachistochrone rear surface with a tangent to it, 70 angle of the i*= 2*+*determining the slope of the Cam is the one resonant length at the optimum deflection, 72 - the average height of the cross section of the tool bucket defining a resonant length at the optimum deflection, 73 - height seats DBtool bulldozer, 74 - height seats Detool bucket, which determines the length of the zone of thermal weakening).Fig. 3. Chart: "the Load - Displacement obtained in the tests for impact bending to determine the impact strength converted from Cartesian coordinates to polar elements that determine the physico-mechanical properties of rocks. Designations: 14 - diameter*swirl, 16 - diameter *pthe Mohr's circle tensile breed, 40 - core profile of high pressure (kernel Boussinesq) generating a shear stress - separation in the monolith, 41 - longitudinal profile of the ellipsoid PD, 43 - diameter cores Boussinesq*I.m.in DD in the monolith, 46 - core profile of high pressure generating shear stress - separation in a weakened mass of rock in DD, 47 - diameter cores Boussinesq *I.about.when DD is in a weakened mass of rock, 75 - axis voltages. 76 - axis strain - displacement, 77 - sample Menage to test for impact strength, 78 - hardening, 79 - zone reversible offset the operator, hardening, 83 - nucleation of fatigue cracks, 84 area of fatigue crack development, 85 - quasihole the destruction of the sample, 86 - area doloma 87 -*= 45+0,5*the maximum power angle, 88 - a vector quantity that defines the shear stress - separation at a speed of implementation 1 m/s, 89 main dimensions of the ellipsoid height h*=0,5 l*under plane deformation methanomethylovorans breed, 90 - angle*, 91 - a vector quantity that defines the shear stress - separation at a speed of implementation of 0.1 m/s, corresponding to a shear stress, separation at an angle of introductionE.=*, 92 - diameter*withJ.the Mohr's circle under uniaxial compression or the length of the aggregated ellipsoid in DD metamorphizing breed, 93 - length compressed ellipsoid or partially cracked viscoplastic crystal from methanomethylovorans breed in DD, 94 - value capture layer n*from methanomethylovorans breed, 95 - velocity coefficient K*v.= 1. when the rate of adoption of 1.0 m/s, 96 - velocity coefficient K*v.when the rate of adoption of 0.1 m/s, 97 - angle*determining the speed ratio at 0.1 m/s, 98 -E.the angle of the odesE.= 90o, 99 - vector intensity of a spherical tensor hydrostatic pressure k*I.90= 0,5*2SG./l*when determining passport breed, 100 is the vector of intensity of the stress deviator k*.90= 0,5*2SG./*I.about.when determining passport breed, 101 - main dimensions aggregated ellipsoid height h**=0,25 l*plane strain metamorphizing breed.Rock cutting tool made of steel casting with hamartoblastoma elements sorbitol structure includes a shank 1 and a wedge-shaped working portion 2 formed in the front surface of the wave form 3, with depths of troughs H1.M4 or H1.O5 and H4.M.6 or H4.O7 brachistochrone 8 or 9 and 10 or 11 before and after the second cycloid 12 or 13, respectively, when interacting with metamorphizing rock (monolith): 0.4 and 0.75 diameter *= 9 - 20 mm 14 forming the specified cycloid 12 lap 15, and when interacting with methanomethylovorans breed, respectively: 0.6 and 1.0 in diameter*p= 14 - 56 mm 16 forming the specified cycloid 13 circle 17 on which are electoral cycloid 12 or 13 height HP. D. M21 or HP. D. O.22 equal to the diameter of 14 or 16 forming her lap 15 or 17, that is, respectively, when interacting with the monolith or weakened by mass, equal to HPD.m.=*or HPD.about.= *pand limited by the length of the perpendicular line h23 with a height of h= *14, recovered from the longitudinal axis of symmetry 24 and the stabilizer 25 with the cavity 26, the side surfaces 27, which are energizers stream 28, and the rear surface of the wave form 29 with the depth of the trough H*4.m.30 or H*4.o.31 brachistochrone equal to 0.75 diameter*= 9 - 20 mm 14 forming a second cycloid 12 lap 15 when interacting with the monolith, or 1.0 diameter *p= 14 - 56 mm 16 forming a second cycloid 13 lap 17 when interacting with a weakened lot, which are Wycliffe element 32 and shaped longitudinal groove 33 offset from the longitudinal axis of symmetry 24 of the flow divider 34 in the confused part 35 figure of a longitudinal groove 33 and the ultrasonic generator 36 and additional inclined slots 37 in the diffuser portion 38 figure of a longitudinal groove 33.In the interaction of the tool with the monolith SUP> and the ratio of the fortress on a scale Protodiakonov fK. P.= 7 - 39 is formed shear zone 39 with a core of high pressure 40 with a diameter of*I.m.43 and other elements aggregated ellipsoid PD 41. When interacting with weak mass and monolith rocks with*= 16 - 38oand fK. P.= 0,5 - 7,0 due to activation polarization process under uniaxial compression is formed similar PD in the form of a viscoplastic single crystal PD 42. The destruction of the ellipsoids of compacted rock is pumped into them energy when the shear stress - separationSD.-oat a frequency faboutgenerated by the kernel of high pressure 40 with a diameter of*I.m.43. The destruction of the seals in the form of a viscoplastic single crystals 42 is first by shifting smaller crystals 44 planes clutch in the zone of the most stable structures - a critical point 45, which forms gaseous products of disintegration, which, migrating in the area of the sliding surfaces, provide avalanche breakdown due to cavitation. Specified is due to the fact that the first electrode turbulator 18 is lengthened and therefore has a significantly lower Flexural gestione increase in shear stress - separation up to 4 times. Further, the destruction of the partially cracked viscoplastic crystal 42 is performed by pumping energy into him at a frequency shift separation through the core of high pressure 46 with a diameter of*I.about.47 greater than the diameter of the*I.m.43.The natural frequency fINF.fluctuations of the working part of the tool due to autoregulates devices together deflection: 4, 6, and 30 or 5, 7 and 31 is continuously adjusted to the frequency fO.generated by the kernel of high pressure, respectively, 40 or 46 depending on metamorphic rocks and the faster, the larger the misalignment. Usually the coarse adjustment takes 2 - 4 minutes, accurate, due to the milling of a series of vortex rings 48 surface of the diffuser 38 another 5 - 10 minutes of operation. Therefore, the coefficient generated by the kernel of high pressure energy piezoelectrically more than 56%, which ensures the destruction of Mykola and prevents locking of the tool. Autoregulation resonance frequency of the working part of the tool is due to the fact that the surface layer of the metal perceives through turbulizing layer 49 dispersed mass of the ode, as well as the phase velocity in the well-known packageversion rocks almost the same: 1,40 - 1.68 m/s, the amplitude-frequency-modulated packets shear stresses are placed between the peaks of the undulating surface of the working part 2 of the tool with an offset not to exceed 30%. In other words, a seizure occurs amplitude-frequency-modulated packets shear stresses that Deplete the breed of the amplitude-frequency packages vibrations of the tool due to the close phase velocities in PD and in the tool and at the expense of significantly greater power. The powerful modulation generated by the engine high pressure frequency shear stress, separation of fO.and the natural frequency of oscillation of the tool of the amplitude-frequency package in the skin-layer metal tool with a phase shift leads to the heating of the metal surface layer thickness up to 2 and the formation from it of hot gas. Movement sublayer Knudsen 50 carries the hot gas from the metal skin layer on the front surface 3 in the direction from electrode - turbulizer 18 to the shank 1, and the rear surface 29 of the diffuser portion 38 to wycliffism element 32. This changes the average height of the working part of the tool, the second tool length, consequently, adjusts the frequency of natural oscillations of the tool fINF., adjusting it to the generation frequency fO.shear stress, separation of the core of the high pressure Boussinesq. When you download a certain amount of energy, when the disintegration of the shell PD 41 or 42 with a thickness up to 2 ends, from an array of bottom separated by a piece of rock, resembling an ellipsoid or cracked the crystal.The proposed solution improves the durability of the tool 1.6 - 2.3 times in comparison with the resource prototype.The annual effect during operation, for example, one bulldozer type T-35,01 (T-500) through the use of a new type of tool can make the consumer to 13 thousand dollars. Original data: angle of internal friction*monolith rocks of the 38othe coefficient of the fortress on a scale Protodiakonov 13, loosening 3 hours a day for 120 days in a year. Annual demand in serial tool: 120 the Need for a tool prototype: 17 PCs /year. The annual demand in the inventive instrument: 10 pcs. In a comparable tool weight: 22 - 24 kg serial tool is released for $ 130. USA / PCs, it is similarly claimed. 1. Rock cutting tool is, including a shank and a wedge-shaped working part formed in the front surface of the wave form, which are electrodes-energizers and stabilizer with resonator, the side surfaces, which are flow energizers, and the rear surface of the wave form, which are Wycliffe element and shaped longitudinal groove offset from the longitudinal axis of symmetry of the flow divider in the confused part figured longitudinal groove and with an ultrasonic generator and an additional inclined slots in the diffuser part figured longitudinal groove, characterized in that what depth deflections brachistochrone before and after the second cycloid front surface and rear surface, respectively, when interacting with the monolith of rock: of 0.4, 0.75 and 0.75 diameter, forming a specified cycloid circle*= 9 to 20 mm, and when the interaction is weakened by the mass of rock 0.6, 1.0, and 1.0 in diameter, forming a specified cycloid circle*p= 14 - 56 mm2. The instrument under item 1, characterized in that the first electrode-turbulization the front surface of the rock cutting tool made in the form of a mirror reflection of the second cycloid the/SUP>paccordingly, when interacting with analita or weakened by mass of rock, limited by the length of the perpendicular height h1=*restored from the longitudinal axis of symmetry.
FIELD: earth-moving equipment.
SUBSTANCE: proposed excavator tooth unit contains holder with main part and nose part, both arranged coaxially relative to longitudinal axial line of holder. Main part is made for fastening said holder to excavator. Nose part terminates in free front end and it has upper and lower surfaces located mainly respectively higher and lower than longitudinal axial line of said holder. Upper surface of said nose part has two inclined sides arranged at opposite sides from longitudinal axial line and in front relative to rear end of said nose part over its length. Each inclined side of said upper surface is arranged at angle of 25-65° to horizontal plane. Lower surface of said nose part has two sides arranged at opposite sides relative to longitudinal axial line of said holder. Cavity made in said nose part comes to one of inclined sides of said upper surface of nose part of holder, being arranged along axis intersecting opposite sides of upper and lower surfaces of said nose part at angle of 30-60° to horizontal plane. Excavator tooth has front and rear end parts. Blind space open to rear end of said tooth and designed for fitting-in section of nose part of holder is made in rear end part of said tooth. Tooth is provided with hole arranged in working combination with inclined cavity of holder when tooth and holder are in working connection. Pin-type locking device is provided being arranged in cavity of said holder and at least partially passed through hole in said tooth for detachable fastening of tooth and holder in working connected. Tooth and holder described in invention form with tooth unit a ground of inventions.
EFFECT: improved reliability of excavator tooth unit.
40 cl, 31 dwg
FIELD: excavation equipment, particularly small metalwork for digging elements.
SUBSTANCE: unit for wearing and supporting members has replaceable tooth head and holding structure including intermediate holder with front part of front end arranged in pocket of rear end of tooth head and complementary thereto. Front part is secured in the pocket by the first glut pin structure. Holding structure also has main holder with front part of front end complementarily inserted in pocket of rear end of intermediate holder and secured in the pocket by the second glut pin structure. Rear end of main holder is operatively secured to cutting blade of excavator bucket. Each front part have oval configuration elongated in horizontal direction. Glut pin structures extend in horizontal direction. Front parts have reinforcing projections arranged in orifices adapted to secure front parts. Holder and tooth head are provided with mating ribbed areas.
EFFECT: reduced unit size, improved power and working characteristic, as well as wear-resistance characteristics.
40 cl, 7 dwg
FIELD: dredgers or soil-shifting machines for special purposes, particularly to cut chaps in ground.
SUBSTANCE: device comprises at least one cutter brought into rotation and at least one the first cutting member to cut ground during cutter rotation in the first direction. At least one the second cutting member for ground cutting rotated in the second direction opposite to the first one is installed on the cutter. At least one of the cutting members may be shifted from the first ground cutting position to the second diverted position. Executive tool to shift the cutting member between the first and the second positions is also provided.
EFFECT: increased cutting ability in both rotational directions, prevention of excessive cutting member wear.
12 cl, 2 dwg
FIELD: mechanical engineering; design of excavator dipper teeth.
SUBSTANCE: parallelepiped inserts are fitted in tooth point and inserts of cylindrical form are fitted further on along working plane. Inserts manufactured of wear-resistant cast iron, owing to shadow effect, prevent intensive abrasive wear of steel base, thus increasing service life of tooth. As wear-resistant inserts are arranged only on one of working surfaces, other surfaces (opposite one) is subjected to more intensive wear which provides finally sharpening of tooth in process of operation. Use of such design and method of manufacture make it possible to increase service live more than two times and provided reliability of operation of excavator dipper.
EFFECT: increased service life and provision of self-sharpening of tooth point owing to fitting-in small size wear-resistant cast iron parts in steel base.
4 cl, 4 dwg
FIELD: mining and building, particularly material shifting devices adapted to releasably connect replaceable bit of excavation tooth with transitional extension structure fastened thereto.
SUBSTANCE: replaceable bit is telescopically put on transition extension and removably secured thereto by means of elongated flat connection unit provided with side peripheral part free of constriction. Connection unit extends in longitudinal direction through bit and connection orifices aligned with each other and prevents bit removal from transitional extension by forward movement thereof. Transversal support surface of bit side facing one end of connection unit prevents it outward passage through one bit orifice. Blocking member supported by another connection unit end and engaged with groove in another bit orifice prevents outward connection member passage through bit orifice provided with grooves. Support structure releasably retains the blocking member in closing and opening directions, which prevent blocking member displacement parallel to connection unit length.
EFFECT: simplified working tool replacement.
51 cl, 5 dwg
FIELD: mining industry.
SUBSTANCE: invention can be used in working members of mining and earth-moving machines, particularly, in machines for digging hard and frozen soils. Proposed ripper point for breaking hard and frozen soils has shank with slot for fastening, and wedge-like working part formed by front end surface, two side surfaces and rear surface. Working part of front end surface located in place of intensive wear is reinforced along longitudinal axial line H-H by three of stress concentrators, being round elements projecting over front end working surface and dipped into body of point. Distance L between concentrators in row and distance 1 between rows is equal to triple value of their diameter.
EFFECT: reduced effort to applied to small soil, reduced power consumption for ripping, increased service life of ripper point.
FIELD: mining, particularly excavation equipment for detachable connection of replaceable tooth crown in earth-shifting machine.
SUBSTANCE: device comprises the first and the second telescopically joined members, aligned orifices formed in the members and adapted for connector receiving and connection finger unit for forced retention of the first and the second members so that the members are telescopically arranged one relatively another. Connection finger unit comprises body, fixing member and resilient stop member. The body is arranged in the aligned orifices so that the body may be removed therefrom. The connector prevents separation of the first member from the second one. The body also has channel opened in outer surface thereof and having non-round side surface section. Fixing member is arranged in channel and limited by side surface section. The fixing member may rotate with respect to the body from fixing position into releasing position and in reverse direction. Resilient stop member is connected with fixing member so that the stop member may rotate together with fixing member. The stop member is adapted to retain fixing member in fixing position. The stop member has periphery delimiting fixing member. The periphery is slidably joined with non-round side surface section so that the periphery and the side surface are mutually complementary.
EFFECT: increased efficiency of connection unit for wearing and support member connection.
37 cl, 14 dwg
SUBSTANCE: cog unit of earthmover bucket comprises cog with seat, which is open at the back and is a female part, besides specified cog has hole for fitting of fixing stud, adapter, having ledge, which is a male part that matches shape of specified seat, besides mentioned ledge is crossed with matching site for fixing stud, fixing stud inserted into specified hole of cog and into specified matching site in adapter and serving for cog fixation to adapter. At least one of specified opposite surfaces of ledge has lowered or deepened area arranged around matching site for fixing stud. At least the wall of seat that is inverted towards specified surface of ledge has relief part additionally to specified lowered or deepened area, having shape of boss that gradually increases in direction of open part of seat. Specified hole in seat walls and specified matching site in ledge have according flat back surfaces, which are matched to each other. Fixing stud has flat back surface, which simultaneously lies onto specified back surfaces of hole and matching site.
EFFECT: simplified design of cog unit for manufacturing, lower costs, avoidance of cog disconnection from adapter under severe operation conditions.
32 cl, 14 dwg
SUBSTANCE: proposed device comprises tooth arranged in adapter and connecting element with sleeve made from elastic deformable material, and key. Said tooth and adapter have holes and zones to receive said sleeve and key. Note that said key is inserted into sleeve to extend therefrom. Note also that said key is fitted aligned with sleeve to displace therein, while sleeve is arranged in adapter part. Key has end part that makes key base, and key head on the body opposite part. Key head has part that makes bearing surface with shifted center. The latter enters appropriate surface made in the tooth first hole. Key head end can be turned by actuator element. Key base has anchoring appliance that enters in elastically deformable sleeve due to first tightening preset-force action. Key base end has conical part that thrusts against tooth second hole making second tightening action exceeding aforesaid one and created by key turn. Key turn governs is shift relative to its initial axis and allows its locking by anchorage on either tooth metal components or different bearing zones.
EFFECT: appropriate locking of tooth-adapter link, higher labor safety.
16 cl, 21 dwg
SUBSTANCE: group of inventions relates to the field of mining and construction, in particular, to rotary cutting tool, which may be used to pierce through thickness of soil. Rotary cutting tool includes body, which has axial front end and axial back end, and also axial length. Hard tip, which has remote end, is fixed to body of cutting tool at its axial front end. Body of cutting tool has a section of back surface, arranged along axis behind remote end of hard tip, and having transverse dimension. Section of back surface includes axial front transverse dimension and minimum transverse dimension, which is located along axis behind axial front transverse dimension. Axial front dimension exceeds minimum transverse dimension. Section of back surface has axial length within the limits from approximately 10% to 35% of axial length of cutting tool body.
EFFECT: improvement of rotary cutting tool, to reduce extent of resistance of rotary cutting tool when piercing through soil thickness, with small angle of separation.
32 cl, 9 dwg