Impact action device
SUBSTANCE: impact action device includes housing provided with an inner bore that receives and allows axial displacement of an impact piston and working tool (spear) arranged coaxially towards said piston. On the top portion of a tool shank there is an annular groove. The lateral surface of said groove mates a limitedly axially displaceable split ring receiving the working tool and at the same time mating the housing surface. Besides, the thickness of said ring is less than the thickness of said groove and its bottom end surface permanently contacts the top end of a rubber-metal shock absorber receiving the working tool. The bottom end of the shock absorber permanently contacts an annular boss formed on the inner side of the housing.
EFFECT: enhancement of reliability, design simplicity and economic feasibility of the device.
2 cl, 5 dwg
Device impact refers to the mining, construction, metallurgy and can be used for crushing of oversized, destruction of solid materials, loosening frozen soils in mining, construction, metallurgy and other industries.
The known device impact companies such as Krupp, Rammer, and others, the device according to the Japan patent No. 0236721, as well as devices for A.S. USSR №777211, IPC EV 1/14 and RF patent No. 2182226, IPC IS 37/00. In these devices working tool made in the form of a cylindrical rod having at its shank one or two flats, interacting with fingers, fixed in the housing of the device. This ensures a constant angle relative to its longitudinal axis position and limited movement along the axis. The disadvantage of this solution is to reduce the strength of the tool by reducing the cross-section of the shank of the tool by the presence of faces.
Also known device, as the USSR №1078051, IPC IS 37/00 and A.S. USSR №1079834, IPC IS 37/00, where to limit longitudinal movement of the tool at the end made the annular ledge. With this choice, the strength of the tool is not reduced, but its production requires increased consumption of material, moreover, is complicated by design.
The main disadvantage inherent in semireclined devices, is the lack of elements for damping the residual energy of the tool during attacks on weak material and especially at idle impacts. As a result, the instrument after impact with considerable speed collides with his body. This leads to large dynamic stresses in the tool, in the fingers and body elements, and, ultimately, to failure.
The closest technical solution to the claimed is a device as. the USSR №564415, IPC IS 37/00, selected as a prototype.
The known device comprises a striking mechanism, in the edge of which side of the tool are hydraulic cylinders, the cavity of which channels communicated with the hydraulic system of the device. When interacting in the end of the stroke of the annular protrusion of the tool with cylinders occurs damping of its residual energy.
The disadvantages of the known device should include the complexity and the large diameter of the projection on the shank of the tool, which requires increased material consumption and more complex designs.
Thus, the disadvantages of the known devices are of low reliability, design complexity and increased cost.
The task, which is aimed by the invention is a device percussion, ex the different high reliability, constructive simplicity and efficiency.
To solve the problem the essence of the invention is that in contrast to the known devices percussion, comprising a housing, the inner bore with the possibility of longitudinal movement are piston-drummer and coaxially with it tool (peak), according to the invention on the shank of the tool in its upper part is made annular groove, with the lateral surface of which involves covering the split tool is limited movable along the axis of the ring, while its outer surface conjugate with the surface. The thickness of the said ring is less than the width of the said grooves, and its lower end surface is in constant contact with the upper end of the covering instrument rubber-metal buffer, which its bottom end is in constant contact with the annular protrusion formed on the inner side of the case.
In addition, the cross section of the tool shank in the groove and mating with the surface of the split ring are in the form of a circle or polygon with number of sides three or more (in the limit - circle), and on the outer surface of each of the two halves of the said ring is made of at least one longitudinal groove, the side on top of the spine which are associated with key, fixedly mounted in the housing.
The technical result that can be obtained from the use of the invention is to simplify the construction of the device, increasing its reliability and reducing the cost.
The invention is illustrated by drawings.
Figure 1 shows the structural diagram of the inventive device, percussion; figure 2 shows a section A-a of Fig 1; figure 3 shows a view "B" of figure 1; figure 4 - example of a specific embodiment; figure 5 shows a section A-a figure 4.
The device includes a housing 1, in the internal bore of which, with the possibility of longitudinal displacement posted by piston-drummer 2. In the lower part (in the drawing) of the housing 1 coaxially with the piston-drummer 2 in the guide rails 3 and 4 posted by tool - peak 5.
On the tool shank spades made annular groove 6 having side 7 and two end surfaces 8 and 9. Its side 7 of the surface of the groove 6 is associated with the inner surface of the split ring 10 consists of two half-rings 101and 102while the thickness of the said ring is less than the width of the said grooves 6.
Its outer surface of the split ring 10 is mated with the inner surface of the housing 1. Its upper end surface of the aforementioned split ring 10 rests on the shoulder 11 of the housing 1 and the lower end surface is STU - on rubber-metal buffer 12, which in turn is in contact with the upper end of the guide sleeve 13, mounted stationary in the housing 1 by means of the outer sleeve 14 and the fingers 15.
An example of the apparatus for impact action, in which the surface of the groove 6 of the tool 5 has the shape of a polyhedron, coupled with the similar surface of the split ring 10, as shown in figure 2. The number of faces can be three or more (in the limit - circle).
In addition, in this case on the outer surface of each of the two halves 101and 102the ring 10 is made of longitudinal grooves connected with the pins 16, fixed in the housing 1. This attachment eliminates the rotating tool 5 peaks around its axis during operation. This is necessary if the working part of the tool is made in the form of a wedge or shovels.
The device operates as follows. In the initial position of the lower end of the tool - peaks rests on the surface of the processed material, such as rocks. The lower end surface 9 of the ring groove 6 is in contact with the split ring 10, which rests on the shoulder 11 of the housing 1.
When working stroke (downward movement) of the piston-drummer 2 at the end of its stroke strikes the tool - peak 5. Under the action of the punch tool - peak 5 is moved along the axis down, somnogenic penetrating into the material being processed. The magnitude of this movement (introduction) 1 depends on the strength (strength) of the processed material and usually does not exceed the value of L, is equal to the difference of the width of the annular groove 6 and the ring 10, i.e. L=C-D, where C is the width of the annular groove, and D is the thickness of the split ring. This means that the impact energy is extinguished on the way 1<L.
During operation of the impact device is constantly pressed against destructible material, providing contact the lower end surface 9 of the ring groove 6 to the split ring 10.
If handled too weak material, the impact energy on the way of implementing equal to L, not hitting, and tool - peak 5 after contact of the upper end surface 8 of the annular grooves 6 split ring 10 continues to move down, deforming the rubber-metal buffer 12 and thereby stermaria tool - peak 5. This limits the peak load on the body 1 of the device.
And, finally, a possible case of "pure shot" or idle stroke when the stroke tool - peak 5 does not concern the processed material. In this case, all the impact energy is extinguished due to the deformation of the rubber-metal buffer 12.
The percussion device made according to the invention, has a more durable tool with a minimum consumption of material, and such is the position in the tool and the clamping minimal even at idle impacts ("pure shot"), which improves the reliability of the device, to simplify its operation and reduce the cost.
1. The percussion device, comprising a housing, the inner bore with the possibility of longitudinal movement are piston-drummer and coaxially with it tool (peak), characterized in that the shank of the tool in its upper part is made annular groove, with the lateral surface of which involves covering the split tool is limited movable along the axis of the ring, while its outer surface conjugate with the surface, the thickness of the said ring is less than the width of the said grooves, and its lower end surface is in constant contact with the upper end of the covering instrument rubber-metal buffer, which its bottom end is constantly exposed to annular ledge formed on the inner side of the case.
2. The device according to claim 1, characterized in that the cross-section of the tool shank in the groove and mating with the surface of the split ring are in the form of a circle or polygon with number of sides three or more, and on the outer surface of each of the two halves of the said ring is made of at least one longitudinal groove, the side surfaces of which are associated with key, NEPAD is tenderly fixed in the case.
FIELD: mining, particularly well drilling methods and devices, namely drilling by use of heat, flame drilling.
SUBSTANCE: method involves obtaining hydrogen and oxygen by water electrolysis; supplying hydrogen and oxygen in combustion chamber with the use of compressor and converting combustion heat into working body heat to melt rock; inflaming and blasting detonating gas to create blast wave and to convert blast product energy into mechanical energy to rotate blades of rotor arranged in combustion chamber and connected with drilling screw installed outside of combustible chamber. Exhausted blast products are delivered to face to improve melted rock mass removal from well bottom to ground surface by means of electric pump. Device comprises derrick, drill pipes, power drive, tripping equipment, pump and drilling assembly. Supply chamber of drilling assembly is connected with electrolyzer vessel through oxygen and hydrogen supply pipelines. Drilling assembly is shaped as wolfram or molybdenum cylindrical vessel with molded air-tight end closures threadedly connected with the vessel. Longitudinal water cooling jacket channels are formed inside cylinder walls. Inserted in the vessel is rotor having blades, which separate vessel into four chambers. Reed switch is connected to inner vessel surface to provide automatic detonating mixture inflaming to blast content of one vessel chamber. Electrolyzer comprises accumulation vessel, vacuum cylinders with vacuum control means and vacuum pumps.
EFFECT: increased productivity and drilling efficiency, as well as extended technological capabilities.
2 cl, 32 dwg
FIELD: tunnel construction, particularly devices to construct hydroelectric power plant floodgates and to build motor roads and rail roads in mountains.
SUBSTANCE: method involves creating conditions favorable for chemical reaction between chemical element oxides basically constituting rock and graphite for rock fusion. For this rock is heated up to high temperature at face by thermal electric arc energy transmission through metal front tunneling machine wall. Electric arc is generated between electrodes inside discharge chambers arranged on inner surface of front tunneling machine wall. Electric current is supplied to electrodes via graphite mass moving through electrically-insulated pipes. Graphite is forced via electrodes and introduced into face through nozzles connected to front tunneling machine wall.
EFFECT: possibility to regulate electric current power and graphite mass to select necessary excavation regimes.
FIELD: mining, particularly methods or devices for dislodging, particularly by electricity.
SUBSTANCE: method involves transferring high-voltage pulses with frequency defined by head rotation rate on rotary drilling head. Drilling tool includes serially connected drilling string 9, drilling head 1, high-voltage pulse source 11 arranged directly in drilling tool over drilling head 1 and charging means 12. The charging means 12 is arranged in drilling tool over high-voltage pulse source 11.
EFFECT: increased drilling efficiency due to increased operational drilling tool reliability.
3 cl, 6 dwg, 1 tbl
FIELD: mining, particularly for rock block separation from rock massif, to create roads and tunnels in rock, to produce row crystalline material, demolish old foundations and building structures.
SUBSTANCE: device comprises power cylinder with piston, rod with spacing wedge-like end passing through power cylinder so that it may slide in longitudinal direction. Device also has collet with tongues and engaging wedges connected to free tongue ends. The collet is put on rod and connected to power cylinder. Rod is secured to linkage and attached to piston. Spacing end thereof is made as truncated cone expanding towards free end of the rod.
EFFECT: increased device efficiency due to possibility to separate edges of crack to be formed enough for highly-viscous block separation from rock massif, simplified structure and provision of rock breakage through small blastholes.
5 cl, 1 dwg
FIELD: mining, particularly well drilling by use of heat, for example, flame drilling.
SUBSTANCE: method involves supplying oxyhydrogen mixture in drilling assembly; igniting the mixture to obtain high temperature. Oxygen and hydrogen contained in oxyhydrogen mixture are obtained by water electrolysis in movable plant arranged just near well and are delivered via flexible hoses. Drilling assembly is heated by oxyhydrogen mixture blasting inside drilling device body with predetermined frequency to create high-temperature and impact wave acting on rock-cutting tool by rock-cutting tool screwing in rock. Well drilling device comprises shell body with blasting chamber, working reagent delivery channel system and exhaust gas discharge channel system. Drilling assembly is made as cylinder of molybdenum or wolfram including tank and lid connected with each by means of screw connections. Longitudinal water jacket channels are arranged inside cylinder walls. Movable rotor blades fixedly secured to hollow shaft are arranged inside the cylinder to divide cylinder volume into several chambers. Supply chamber of drilling assembly is communicated with electrolyzer chamber through gas conduits, accumulator vessels, vacuum cylinders and vacuum pumps. Reed switch and spark-plugs connected with each other through electrical chain to provide detonating gas blasting inside chamber are built in inner cylinder side.
EFFECT: improved capacity and operational efficiency.
2 cl, 15 dwg
FIELD: construction and geology, particularly to break natural and artificial scale and deposits and to drill holes.
SUBSTANCE: method involves supplying water under pressure at hydraulic cavitational device inlet; activating hydraulic cavitational process in the device with the use of cavitational body located inside the device; directing cavitation water jet from device outlet to surface to be eroded. Pressure of 90-200 atm is provided at device inlet. Space in front of surface to be broken is filled with water for height of at least 300 mm of water column. Distance between device outlet section and surface to be broken is 20-1500 mm. Hydraulic cavitational process has maximal power to provide vibratory super-cavitation with local medium heating, water ionization and cavitational erosion of surface to be broken. This is provided by two ways of water jet direction inside the device. In the first case water jet is directed through two-step chambers having different cross-sections. In the second case water jet passes trough hollow cavitational body made as contraction tube secured inside the chamber. Both water jets are mixed with each other at device outlet. Vibratory super-cavitation presence is detected. Device comprises hollow body with opposite opened ends, cavitational body secured in the body so that the cavitational body extends in longitudinal body direction, and hollow nozzle. Body interior is made as two-step cylindrical chamber. The first step is inlet step and has diameter not exceeding 0.5 of that of the second step. Cavitational body is hollow contraction tube having wavy surface and tapering in water jet direction from device inlet. Ratio between the smallest nozzle and contraction tube diameters is 1.25-2.0.
EFFECT: increased cavitational jet power.
5 cl, 4 dwg
FIELD: construction industry, particularly to drive heavy reinforced concrete and metal shelled concrete piles during ice-resistant fixed platform, including underwater one, construction.
SUBSTANCE: electric hammer comprises body with three-phase winding of linear induction motor stator adapted to receive reciprocating hollow striking armature installed therein in fluid-tight manner. The striking armature is monolithic in lower part and includes short-circuited current-conducting winding formed from outer surface thereof. Hammer comprises anvil block with damping means. Linear induction motor stator winding is installed in upper part of cylindrical electric hammer body, which is provided with tubular striking armature position sensors. Cylindrical body of electric hammer is installed inside cylindrical sealed shell so that lower and upper chambers are created. Chamber lengths are equal to cylindrical body length and striking armature travel correspondingly. The upper and lower chambers are freely connected with each other. Upper chamber is communicated with striking armature interior. Lower chamber has pipeline with check valve. Lower chamber and striking armature interiors are partly filled with heat-conductive and electrical insulation liquid. Remainder zones of lower chamber, striking armature interior and total upper chamber are filled with high-pressure heat-conductive gas. Lower chamber has protective safety valve. Vacuum chamber is created between lower monolithic striking armature part and anvil block. Damping means is installed in lower monolithic part of cylindrical electrical hammer body in fluid-tight manner and may reciprocate relatively the body. Cylindrical fluid-tight shell has additional weight. Short-circuited current-conducting winding of linear induction motor stator is linked to frequency-regulated power supply and control system.
EFFECT: increased operational reliability.
FIELD: mining, particularly for mine excavation, well drilling, ore preparation, in geophysics for deposit exploration and probing.
SUBSTANCE: method involves applying pulsed electromagnetic field and elastic stress waves to rock, wherein rock is simultaneously treated with pulsed magnetic field having induction of 0.25-1.5 T, pulse duration of 100-300 microseconds and 1·10-2 - 5·108 Hz frequency, and elastic stress wave. As elastic compression stress waves act on rock magnetic field is created by positive current pulse half-waves. As elastic extension stress waves act on rock magnetic field is created by negative current pulse half-waves. As electric rock resistance decreases up to electric resistance of conductive and semiconductive minerals forming said rock electric current is passed through rock along with following magnetic field induction vector change to provide total rock loosening in treated zone. Magnetic field induction vector is directed orthogonally to elastic stress wave propagation and then the cycle is repeated.
EFFECT: increased degree of crystalline rock weakening due to destruction thereof, inter-crystalline bounds weakening along with decreased power inputs and material consumption.
FIELD: mining, particularly methods or devices for dislodging with or without loading.
SUBSTANCE: method involves drilling well; filling well with liquid and powder material; forming cracks in three planes simultaneously, wherein the planes pass through well axis and extend at 90-180° angle one relatively another. The cracks are created by impact waves applied to liquid with rod accelerated in free fall mode. Powder material is used for crack propping. Device comprises hollow body, rod with wedges connected to outer surfaces of rod wings and installed on the body, sealing elastic bush arranged from outer body side. One body end terminates in collet. Wings are installed along side edges of rod wings and define sharpened tips as the result of mutual contact thereof. Another body end is threadedly connected to pipe adapted to receive rod with annular extension. Distance member, which spaces apart collet wings, is installed in the body so that it may slide in longitudinal direction towards free end of the body. Sealing elastic bush is put on the body from collet side.
EFFECT: improved production well efficiency, rock piece separation from massif and elastic wave emission, increased rock cutting efficiency.
5 cl, 4 dwg
FIELD: mining and construction, particularly hydraulic percussion devices for percussion driving rod members in ground, oversized pieces breakage and so on.
SUBSTANCE: machine comprises body, striker, forward and reverse stroke chambers arranged in-between, additional chamber, control channel made in the body and flow control device to connect forward stroke chamber with liquid source, with accumulator and reverse stroke chamber in the end of striker stroke. After striker detention before direct stroke as system pressure becomes equal to predetermined pressure Pd forward stroke chamber is communicated with tank return line. The second control chamber of flow control device is spring-loaded with force calculated with accordance to Pd value. In the end of reverse stroke additional chamber is communicated with tank return line. In the end of direct stroke additional chamber is connected with liquid source, accumulator and reverse stroke chamber. Forward stroke chamber is made as slide and hydraulic cylinder fixedly connected thereto through rod of double action hydraulic cylinder piston. Chambers of said hydraulic cylinder are used as control chambers of flow control device. The first chamber of the hydraulic cylinder having lesser working area is permanently connected with direct stroke chamber. Said chamber is also communicated with liquid source, accumulator and reverse stroke chamber through throttle and slide. The second chamber having greater area is connected to additional chamber through control channel of the body and is spring-loaded with said spring through slide. Channel communicating direct stroke chamber with tank return line is closed with striker as additional chamber is connected with tank return line in the end of reverse stroke.
EFFECT: increased output due to increased impact frequency and power and improved reliability due to minimized energy losses during flow control device shifting between forward and reverse machine strokes.
2 cl, 1 dwg
FIELD: mining industry, construction, mechanical engineering, etc.
SUBSTANCE: machine includes barrel made of impact and static sections, mounted telescopically one in another with possible axial displacement, excluding axial impaction thereof to each other, while both sections are placed in resilient body, made of elastomer, and body has inner bead formed by coaxial recesses of greater and lesser diameters, while impact section is placed in recess of lesser diameter on the outer side of body, and static section is placed in body recess of greater diameter and has outer bead for interaction with appropriate inner bead of body, and also has longitudinal grooves on outer surface, made along forming lines, portion of which by radial drain ports near inner end of barrel are connected to straight drive chamber, and second part connected to back flow chamber by drain ports near outer end of barrel, below-valve and above-valve saddles, respectively covers for barrel and valve box, are made in form of straight and reversed cones, and valve is made of elastic polymer in form of two-tab construction, tabs of which consist of two hollow truncated cones, rigidly interconnected by bases, with forming of chamber, conical on both sides, and outer conical surfaces of upper and lower tabs match conical surfaces of respectively above-valve and below-valve saddles and interact with them in turns, impact mechanism is made of two masses serially placed in barrel - striker and piston, having spherical ends for interaction with forming of intermediate chamber between them, working implement holder lid, fixed on outer end of body, made of elastomer, has a recess in form of inner cone inside ring-shaped edge for interaction with appropriate outer cone on body and pass aperture in base near center, diameter of which matches diameter of bead on replaceable implement, holder of working implement is made of shockproof elastomer in form of cut bushing, having a bead outside for interaction with bottom inside lid and a cylindrical portion, diameter of which matches diameter of pass valve in lid, in which it is mounted, and inner holder diameter matches diameter of neck of replaceable working implement.
EFFECT: higher efficiency, lower vibration, higher effectiveness.
FIELD: mechanical engineering; jack hammers.
SUBSTANCE: proposed hammer has housing with two working chambers, upper and lower ones, arranged in tandem and divided by bridge with hole. Striker in form of rod with two pistons end ends, upper and lower ones, is installed in chambers. Striker is in contact with shank of working tool. Hammer is provided with air distributor and channels in housing. Channel along which compressed air is supplied to execute idle stroke of striker are laid only to lower part of upper chamber under upper piston. Chamber under lower piston is in constant communication with atmosphere through holes in walls of housing in zone of contact of striker with shank of working tool.
EFFECT: reduced back blow (vibration) and force to be applied to hammer at operation.
2 cl, 2 dwg
SUBSTANCE: device has impact assembly, support for fixing impact assembly, pneumatic tanks, mounted between impact assembly and support. Pneumatic tanks are interconnected constantly by air-conducting sleeve. One of tanks is connected to compressed air source by air-conductive sleeve, containing adjusting device for changing rigidity of tanks dependent on changes in physical-mechanical properties of destructed object.
EFFECT: higher reliability.
FIELD: mining industry, particularly use of explosive substances based on calcium oxide for developing decorative rock, for safe breaking building structures and objects taken out of service.
SUBSTANCE: method involves reducing limestone to powder state, mixing powder with fine solid fuel; granulating thereof; high-temperature roasting the obtained granules in bed by penetration method under temperature of not less than 1500°C; grinding roasted granules to obtain the following fractional composition (% by weight): particles with 0.1 mm or lesser size- 30-50, particles with 0.1-0.25 mm size - 25-40, particles with 0.25-0.5 mm size - 15-25, particles with 0.5 mm and greater size - up to 20. To provide increased expansion clinker binding agent, for instance Portland cement taken in amount of 10-30% of roasted product mass is added to roasted granules.
EFFECT: improved quality, increased inner friction of hardening mix, provision of breaking force exceeding 180 MPa and 1.5-2 fold cost reduction in comparison with prior art method using rotary furnaces.
2 cl, 1 tbl
FIELD: mining industry.
SUBSTANCE: device has hollow cylindrical body with radial apertures and ring-shaped shelves at the ends and self-compacting collars. These are mounted on opposite ends of body and are adjacent by bases to its ring-shaped shelves. On the latter barrels are fitted with central apertures in bases. Through barrels and body a pipe is let with possible longitudinal displacement relatively to body, having radial apertures, ring-shaped shelf at one end and outer thread at other end. Pipe is pressurized on the side of ring-shaped shelf, its radial apertures are in zone of radial apertures of body, one barrel is stopped against ring-shaped shelf of pipe, and other barrel is connected to pipe by threaded connection.
EFFECT: higher efficiency.
FIELD: mining industry, particularly devices for drilling and reaming wells in hard rock.
SUBSTANCE: drilling device has drilling tool made as boring rod with rock-cutting members and flame-jet burner installed at end thereof. Device also comprises pipelines for supplying fuel, water and air from discharge compressor outlet to flame-jet burner, as well as compressor with filter arranged at suction pipe inlet. Filter comprises body with condensate-tapper, converging nozzle and deflector. Flame-jet burner is made as a plurality of nozzles. Number of burner nozzles is divisible by 2. Each nozzle has curvilinear grooves extending from inlet orifice to outlet one in longitudinal direction. Curvature of groove generatrix of one nozzle advances in clockwise direction. Curvature of groove generatrix of another nozzle advances in counterclockwise direction.
EFFECT: reduced power inputs due to improved parameters of temperature fields and fields of stresses in well body where high-temperature fuel combustion processes cooperate with rock of complex structure and texture.
FIELD: dislodging equipment for cutting rock, artificial frangible materials, for loosening frozen ground and for compacting fill-up soil, particularly replaceable tool adapted to be connected to shovel boom and operative tool of fixed high-strength rock dislodging plant.
SUBSTANCE: device has resilient seals, hydropneumatic accumulator piston movably installed in device body and comprising cylindrical shaft connected to piston end facing hydraulic chamber thereof and mating device body. Cylindrical shaft has annular groove formed in medium part thereof and brings end chamber of distribution means having larger diameter into communication with draining pipeline or with working liquid source through body channels. End chamber having lesser diameter permanently communicates with working liquid source. Rear cavity of working stroke chamber located behind working end of percussion piston communicates with working liquid source or with working stroke chamber through body channels and two check valves.
EFFECT: increased efficiency, simplicity and reliability, reduced cost and size, improved manufacturability, prevention of working fluid flow between working stroke chamber and idle stroke chamber, increased impact frequency with a given pump capacity and impact energy.
2 cl, 1 dwg
FIELD: mining, particularly hand tools or hand-held power-operated tools specially adapted for dislodging minerals.
SUBSTANCE: pneumatic hammer comprises arm with cup, executive tool, body with outlet channel closed with lid from arm side and defining annular prechamber for system air between cup and lid, working and idle stroke chambers, displacement chamber located between lid and larger body step and pressurizing chamber defined by recess with cut-off edges permanently formed on inner side surface of central stepped channel by annular prechamber communicated with compressed air system. Hammer also has inlet throttle channel formed in pressurizing chamber wall, annular neck portion located in central stepped lid channel between pressurizing and displacement chambers, bypass displacing channel having radial outlet formed in the body and communicating with working stroke chamber arranged between pressurizing chamber and outlet channel formed in the body and striker with upper and lower cut-off edges located in central stepped channel along body axis. Distance between the striker edges is greater than distance between displacement chamber outlet and cutoff edge of larger central channel step. Hammer is additionally provided with inlet throttle channel made in the lid and permanently communicated with annular prechamber. Radial bypass displacing channel inlet is formed in the annular neck portion between pressurizing and displacing chambers from displacing chamber side so that distance between cut-off edges of displacing chamber on side central stepped body channel surface is greater than distance between cut-off striker edges.
EFFECT: increased power of hammer stroke.
FIELD: mining, particularly hand tools or hand-held power-operated tools specially adapted for dislodging minerals.
SUBSTANCE: pneumatic hammer has body with radial outlet channel and central channel, lid with annular shoulder and central orifice supported by body end in air-tight manner, striker with through axial channel dividing central body channel into working and idle stroke chambers, tube having blind shoulder arranged from lid side, longitudinal and radial channels. The tube is installed coaxially in central body channel and cooperates with through axial channel of the striker and with central lid orifice by side wall thereof so that annular dap is created between tube and lid. The annular gap may be closed with blind lid shoulder. Hammer has cup, which is air-tightly installed relative annular shoulder and body so that annular accumulation chamber is formed between side cup surface and lid. Annular accumulation chamber is permanently communicated with idle stroke chamber by radial bypass channel in the body. Annular lid shoulder and cup with air inlet channel define prechamber. Air inlet channel permanently communicate prechamber with compressed air system through air hose and nipple releasable connected to the cup. Hammer comprises ring with outlet orifices forming outlet chamber between the body and outlet channel, executive tool with shank and shoulder cooperating with body end and with shank cooperating with hammer, cap with annular shock absorber retaining executive tool from falling out of central body channel. Executive tool shank is provided with central blind hole for receiving tube rested upon bottom thereof. Side surfaces of the tube and central blind hole cooperate to define annular channel having throat, which is not less than that of longitudinal tube channel.
EFFECT: increased operational reliability and power of hammer stroke.
FIELD: mining and building, particularly control methods for hydraulic driven pulse systems, to design hydraulic percussion machines.
SUBSTANCE: method involves permanently connecting return stroke chamber to system comprising liquid source and accumulator; connecting forward stroke chamber alternately to liquid source or to drain means adapted to discharge liquid into vessel through hydraulic distribution means including the first and the second control chambers, wherein forward stroke chamber is connected to liquid source in response to a control signal which controls striker shifting into forward stroke, and forward stroke chamber is connected to drain means in response to a control signal which controls striker shifting into return stroke after striker fixation; exerting permanent additional force upon the second control chamber connected to upper striker location sensor. Above alternate connection between forward stroke chamber and liquid source or drain means is carried out by means of quick-acting valve connected to liquid source, to drain means and to the first chamber of hydraulic distribution means. Above control signals for striker shifting into forward or return strokes are transmitted to quick-acting valve from control unit. Time delays for control signal transmission are set manually or with the use of control unit to provide quick-acting valve shifting relative synchronization moment set by timing sensor in accordance to operation condition sensor signal magnitude.
EFFECT: increased efficiency and operational reliability.
2 cl, 1 dwg