Tail drilling bit

FIELD: mining.

SUBSTANCE: tail drilling bit includes head of bit and shank of bit; at that, shank of bit is equipped with clamping sleeve in which shank of bit is fixed in the direction of its longitudinal axis by means of captive coupling and has the possibility of free rotation about its longitudinal axis. Clamping sleeve is equipped with fasteners which are engaged with circumferential slot of attachment section of the bit shank so that clamping sleeve is retained so that it can be rotated, however with captive coupling in axial direction of the bit shank. The latter has shank elongation on its end facing from the bit head; at that, the above shank elongation has tool location element. The latter is accessible through intermediate area of shank elongation in the bit axial direction, which is shifted backwards (retracted) relative to external surface of the bit shank and/or relative to external surface of clamping sleeve.

EFFECT: simpler erection and removal of the bit through mounting hole for the bit attachment.

10 cl, 2 dwg

 

The invention relates to a tail bit, including the head of the bit and the shank of the bit, while the shank of the bit provided with the clamping sleeve in which the shank of the bit is fixed in the direction of its longitudinal axis captive connection with the possibility of free rotation around its longitudinal axis.

These tail bits are known in various versions of the implementation. They are usually used in mining machines, road milling machines and the like for removal of tar, rocks, etc. While the tail bits are fixed in the holders, which are mounted on a milling drum machine. The holders provided with a hole as a socket for attachment of the bit. In it the shank of the bit is inserted into its clamping sleeve. When the clamping sleeve is resiliently clamped by the inner walls of the socket for attaching the bit. The tail bits are fixed in the clamping sleeve in the direction of its longitudinal axis captive connection, however, with the possibility of free rotation.

During use of the tip of the tool bit attached to the head of the bit is on removable material and when this wears out together with the head of the bit. When the limit of wear is reached, the tail bit must be replaced. To overcome the clamping forces clamping sleeve to the tail bits shall shall be applied force in the axial direction. The prior art a variety of tools that can be used for this purpose. For example, in WO 97/23710 instrument is described in which the handle by a swivel attached to the release site, having the form of a trunnion. The tools used for disassembly of the tail bits. For this release of land through the hole in the back side planting holes for mounting the bit that slides inside and is pressed against the free end of the shank of the bit. Then the handle can be turned up until it is in contact with the supporting section. You can now move the handle relative to the squeezing of the site in the hinge connection. The resulting lever effort is transmitted through the release of land to the bit so that the new clamping sleeve fixation stops. When the tail bits are removed and the tool is removed, in the planting hole, you can install a new neizrechennoe tail chisel and beat him with a hammer. Replacement tail bits using a known system requires effort, and if there is insufficient space its implementation is associated with a particular risk.

From DE 3026930 A1 other known device for dismantling. For these devices required a plunger which is mounted in the area of the planting holes of the tail bits. Pusher to moreparameters linearly relative to the tail end of the shank of the bit, thus the tail bits may be ejected from the socket outward.

The task of this invention is to provide a tail bit first mentioned kind which can be mounted and removed through the planting hole for fastening bits.

This problem is solved due to the fact that the shank of the bit at its facing the head of the bit end of a lengthening of the stem, and this elongation of the shank has an element for securing the tool and the item-based tool provides access through displaced backward relative to the outer surface of the shank of the bit and/or relative to the outer surface of the clamping sleeve intermediate region of elongation of the shank in the axial direction of the bit.

With this design provides the possibility of moving element of the tool in the staging area. For disassembly of the tail bits protruding element of the tool is inserted in the element-based tool, and adjacent to the speaker and the tool element area element moves along the intermediate region. The staging area allows the Executive element to move through the planting hole when inserted in the element-based tool as the tool element. the thus, the you can assemble and disassemble the tail bit by element through the planting hole.

One of the preferred embodiments of the invention provides that the intermediate region is formed between the outer surface of the cylindrical shank of the bit, which has a first diameter, and an end section extending shank, which has a second diameter, the second diameter smaller than the first diameter. The intermediate region is formed in the area differences of the diameters. If, in addition, provided that the Central longitudinal axis of the shank of the bit and the end portion located on one straight line, and the intermediate region formed by the annular space between the surfaces of the first and second diameter, the access to the element-based tool available on the entire circumference, which facilitates the installation of the tool on the tail bits.

The element-based tool can be formed by a circumferential groove. Thus the tail bits are manufactured just as chiseled detail.

One of the preferred variants of the invention provides that the elongation of the shank has a plot of penetration and release of land, which are directed transversely to the Central longitudinal axis of the tail bits. Thus, across the direction of the Oia mounting or Dismounting formed oblique shaped surfaces (undercut), which create the possibility of capturing tool with geometric closure for secure mounting or Dismounting.

To make this tool even if there is insufficient space and lack of review can reliably be introduced into the device for clamping tools, the invention of the tail bits can be performed so that the shank of the bit and/or elongation of the shank of the passed in element-based tool through a facet.

To facilitate the mounting work can be provided that the clamping sleeve is tensioned wear washer that holds the clamping sleeve in a condition of preload, and wear washer moves with the clamping sleeve in the direction of the head of the bit, and shifted wear washer is located on the formed between the head of the bit and the clamping sleeve and the transition section of the shank of the bit, releasing the clamping sleeve. The preload using a wear washer clamping sleeve can be easily assembled with the invention of the instrument.

Hereinafter the invention is explained in more detail depicted in the drawings, the exemplary embodiment. Shown:

figure 1 is a side view and partial section of the tail bits, prepared for m is ntaiu in the tool holder, and

figure 2 - tool holder according to figure 1, a perspective view.

Figure 1 shows the tail a bit with the head 10 of the bit and shank 20 bits. The head 10 of the bit has a socket in which is inserted the tip 12 of the drill bit and soldered therein. The tip 12 of the drill bit is usually made from solid alloy. The head 10 of the bit is adjacent to the tip 12 of the drill bit side lateral surface 11. These notches when using the tool flows remove formation material. Lateral surface 11 facing to the tip 12 of the bit area is covered by cladding 15 of hard alloy, which is made by navarivanija. Thus, the head 10 bits to be protected in this particularly subject to wear region.

In the transition region between the head 10 of the bit to the shank 20 of the bit head 10 of the bit has a shoulder 13. This flange forms a directed downwards bearing surface 14. It is symmetrical to the axis of rotation of the collar 13 is attached a cylindrical transition section 21. The transitional section 21 preferowan mounting section 22, which is also made in the form of a cylinder. At its free end mounting section 22 passes through the chamfer 25 elongation 20.1 shank. Elongation 20.1 shank provided with a circumferential groove, which serves as the element 26 to the base of the instrument. After groove elongation 20.1 shank ends end uchastka is 29. The tail section 29 formed at the free end of the shank is a flat bearing surface, which serves as a dewatering section 28. Addressed to trimname section 28 of the wall element 26 for securing the tool forms section 27 retracting.

On the mounting section 22 of the shank 20 of the bit slipped over the clamping sleeve 23. A cylindrical clamping sleeve 23 is formed by a folded cut sheet steel. The clamping sleeve 23 provided with a slot 24, which runs in the longitudinal direction of the clamping sleeve 23 and, as in the present case, can be offset.

On the clamping sleeve 23 are fasteners that protrude in the direction of the shank of the bit. These fastening elements in figure 1 are not visible. Fasteners are to engage in the ring groove of the fixing section 22. Due to this, the clamping sleeve 23 can rotate freely in the circumferential direction, however, in the axial direction is held captive by the connection.

On the clamping sleeve 23 is wearing a wearing washer 50. Wear washer 50 has a hole into which is inserted the clamping sleeve 23. The inner diameter of the hole is less than the outer diameter of the clamping sleeve 23 in its nesaratnam condition. When wearing the washer 50 is attached to the clamping sleeve 23, the outer diameter of the clamping sleeve 23 is designed for people who is, so it is in a condition of preload. As can be seen in figure 2, wear washer 50 is made in the form of machined parts. Wear washer 50 has a circumferential wall 52, which limits the Cup 53. On the bottom side of the wear washer 50 is a nozzle 51, which is made in the form of a bevel. Wear washer 50 can move in the axial direction of the tail bit side of the head 10 of the bit. When she falls in the region of the transition section 21, wear washer 50 releases the clamping sleeve 23, so that it can expand in the radial direction.

The tail bits can be mounted in made in the form of holes mounting hole 31 of the holder 30. This can occur with the use of a tool. The instrument is supplied with actuating element 40, which forms the clamping element between the shelf 42 and the Cam 41. The Cam 41 is included with the link element 26 to base of tail tool bit, while the shelf 42 is adjacent to trimname section 28. The actuating element 40 of the tool passes through is made in the form of through holes planting hole 31 of the holder 30.

Shelf 42 and the Cam 41 are connected by a bridge 44, the bridge 44 is made so that it may be injected between the inner edges of the landing is TVersity 31 for attachment of the bit and the end section 29. For this purpose, the end section 29 is shifted back (pulled toward the Central axis) relative to the outer surface of the fixing section 22 (shank bits) and relative to the outer surface of the clamping sleeve 23, as it has a smaller diameter than the mounting section 22 and the clamping sleeve 23.

Due to thus shifted back staging area element 26 for securing the tool is available in the axial direction of the tail bits in the bypass end portion 29. Thus, it is possible to pull the tail a bit with the help of element 40 through the planting hole 31. In the process of tightening the clamping sleeve 23 hits the facet 43 of the tool holder 30, which passes around the planting holes 31 for mounting the bit. In this case, upon further retraction of the clamping sleeve 23 is compressed in the area of planting holes 31 or chamfer 43 in the radial direction inside. Then wear washer 50 gets on the bearing surface 32 of the holder 30. While wearing the washer 50 is shifted in the direction of the head 10 of the bit, until it reaches the region of the transition section 21 and, as described above, will release the clamping sleeve 23. Revealed in the radial direction of the clamping sleeve 23 is then decompressed on the inner walls 31 for attachment of the bit. This Polo is the situation the flange 13 rests in the Cup 53 wear washer 50.

When the trailing bit has reached its limit of wear, it can be again removed from the tool holder 30. For this purpose, the actuating element 40 with its Cam 41 is inserted into the element 26 to the base of the instrument. Because in this state, the shelf 42 is adjacent to trimname section 28, the tail bit under the force element 40 can be removed from the planting hole 31.

When this is overcome created the clamping sleeve 23, the frictional force between the bore 31 and the outer surface of the clamping sleeve 23. When the tail bits are then reaches its shown in the figure 1 position of disassembly, it can be removed from the element.

To deliberately dismantle the tail bits to get the ability to simply insert the actuating element 4 in the element 26 to the base of the tool, preferably, if the elongation of the shank 20.1 held out planting holes 31 for mounting the bit. For this planting hole 31 for fastening the bits made in the form of through holes. Then the elongation of the shank 20.1 stands for facing away from the head 10 bits outlet.

However, the elongation of the shank 20.1 may also be inside the planting holes 31 for mounting the bit. Then you must consider that to insert the Cam 41 in the element is provided 26 for securing tool it may be held through an intermediate region between the end section 29 and the sides of the planting hole 31 for fastening the bits.

1. The tail bits, comprising a cylinder (10) of the bit and the shank (20) of the bit and the shank (20) of the bit provided with the clamping sleeve (23), in which the shank (20) of the bit is fixed in the direction of its longitudinal axis captive connection with the possibility of free rotation around its longitudinal axis, characterized in,
that the clamping sleeve (23) is provided with fastening elements that are included with the link in the circumferential groove of the fastening section (22) of the shank (20) of the bit, so that the clamping sleeve is held with the possibility of free rotation, but with the captive connection in the axial direction of the tail bits, and
the shank (20) of the bit at its facing away from the head (10) of the bit end of a lengthening (20.1) of the shank, and
this elongation (20.1) shank has an element (26) for securing tool, and
element (26) for securing tool is available through displaced backward relative to the outer surface of the shank (20) of the bit and/or relative to the outer surface of the clamping sleeve (23) an intermediate region of elongation (20.1) of the shank in the axial direction of the bit.

2. The tail bit according to claim 1, characterized in that the intermediate region is formed between the outer is th surface of the cylindrical shank (20) of the bit, which has a first diameter (D1), and an end section (29) of elongation of the shank (20.1), which has a second diameter (d1), and the second diameter (d1) is less than the first diameter (D1).

3. The tail bit according to claim 1, characterized in that the Central longitudinal axis of the shank (20) of the bit and the end portion (29) are located on one straight line, and the intermediate region formed by the annular space formed between the first and second diameters (D1 and d1).

4. The tail bit according to claim 1, characterized in that the element (26) for securing the tool is formed by a circumferential groove.

5. The tail bit according to claim 1, characterized in that the extension (20.1) of the shank has a section (27) pull and release area (28), which are directed transversely to the Central longitudinal axis of the tail bits.

6. The tail bit according to claim 1, characterized in that the shank (20) of the bit and/or elongation (20.1) of the shank enters the element (26) for securing the tool through the facet (25).

7. The tail bit according to claim 1, characterized in that the clamping sleeve (23) tight wear washer (50), which holds the clamping sleeve (23) in a condition of preload, and
wear washer (50) is moved from the clamping sleeve (23) in the direction of the head (10) of the bit,
and shifted wear washer (50) is located on formed between golaud is some (10) of the bit and the clamping sleeve (23) transition area (21) of the shank (20) of the bit, releasing the clamping sleeve (23).

8. The tail bit according to claim 1, characterized in that the cylinder (10) of the bit is attached to the tip (12) bits lateral surface (11)facing the edge (12) of the bit area is covered by cladding (15) from solid alloy, which is made by navarivanija.

9. The tail bit according to claim 1 or 7, characterized in that in the transition region from the head (10) of the bit to the shank (20) of the bit head (10) of the bit has a shoulder (13), to which is adjoined by a cylindrical transition section (21) for accommodating wear washers (50).

10. The tail bit according to claim 9, characterized in that it contains wear washer (50), which has a circumferential wall (52), which limit sleeve (53)and the flange (13) of the head (10) of the bit is placed in the Cup (53).



 

Same patents:

FIELD: construction.

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

FIELD: machine building.

SUBSTANCE: cutter consists of cutting point made out of silicon-carbide diamond composite and of case made out of metallic material. Also material of the case possesses higher coefficient of thermal expansion, than composite of the cutting point. Notably, the cylinder part of the point and internal surface of the case cavity of the cutter have coating. Heated metal, able to combine with any coating, is introduced into a circular cavity formed between the cylinder part of the point and a wall of the case cavity, thus fixing the point in the case. Upon successive cutter cooling, the case shrinks exerting sufficient pressure on solidified metal and presses it to cylinder external surface of the point.

EFFECT: upgraded strength of fixing cutting point in case of cutter.

19 cl, 2 dwg

FIELD: mining.

SUBSTANCE: invention is related to the field of mining and construction, in particular to method for manufacturing of rotary cutting tool body, which is a component of earthwork machine. Method for manufacturing of cutting tool body includes provision of stock material, having axial front end, and simultaneous arrangement of seat by cold stamping in axial front end of stock material and stripper groove in back axial location of seat.

EFFECT: increased strength of cutting tool body without mechanical treatment to reduce amount of raw materials required to manufacture rotary cutting tool.

2 cl, 9 dwg

FIELD: mining.

SUBSTANCE: suggested invention is related to the field of mining and construction, in particular to cutters with round tails. Cutter with round tail comprises tail, at the same time tail is retained with the possibility of rotation in clamping cartridge. Clamping cartridge is equipped with one or several retaining elements that protrude inside, which enter circular groove arranged in cutter tail, so that clamping cartridge is retained on round tail of cutter without possibility of shift in axial direction. One or several retaining elements are installed in medium transverse plane of clamping cartridge or have identical axial distance from it. Clamping cartridge is arranged with the possibility of installation in two axial positions turned by 180 around its longitudinal axis on round tail of cutter and fixation on it selectively in one of both identical positions. Retaining elements are arranged between two oriented forming edges across longitudinal axis of clamping cartridge and are stamped and/or impressed inside. Besides forming edges pass along part of clamping cartridge circumference and have distance from each other, which is equal or less than width of circumferential groove in round tail of cutter.

EFFECT: simplified installation of clamping cartridge on round tail of cutter.

11 cl, 4 dwg

FIELD: mining.

SUBSTANCE: disclosed group of inventions refers to mining industry, particularly to rock destruction tool for mining machines used at deposit development. The cutter consists of an elongated tail piece, of a cutting element secured at one end of the tail piece, projected out of it and made out of material of hardness exceeding hardness of the tail piece, and of a composed bushing formed with multitudes of belts secured around the tail piece near the cutting element and directly adjoining each other. Also belts of the bushing are fabricated out of material more hard, than material of the tail piece, the material of belts is less prone to produce an igniting spark, than material of the tail piece during cutting.

EFFECT: increased safety at mining operations due to reduced probability of generating igniting spark when cutter touches surface of rock in mining works hazardous for gas and dust, also increased wear resistance of cutter tail piece.

27 cl, 4 dwg

Tool holder. // 2347907

FIELD: mining..

SUBSTANCE: invention refers to mining and building, particularly to machines with pulvimixer. A tool holder for a machine with the pulvimixer or such like has base (10) which bears holding added piece (30), also added piece (30) has receiving seat (31) of the cutting tool; and lug (15) is attached to base (10) before holding added piece (30) in the direction of tool holder feeding. Base (10) has connecting section (20) made in form of a chip breaker; the connecting section is formed on base (10) and passes at least partially through lug (15) starting from holding added piece (30). End section (34) of holding added piece (30) has intake seat (31) of the cutting tool made in form of an aperture. Also end section (34) has circular contact surface (33) passing around medium lengthwise axis of intake seat (31) of the cutting tool. Contact surface (33) which is located radially outside passes up to dimension boundaries of a cylinder region of end section (34). Connecting section (20) returning in the direction of the axis relative to contact surface (33) is connected with holding added piece (30).

EFFECT: improved operation of cutting of disk pulvimixer.

9 cl, 3 dwg

FIELD: mining engineering.

SUBSTANCE: invention relates to mining industry, particularly the cutting tools of mining machines serving to disintegrate coal and other mine rocks. The cutting tool for disintegration of coal and other mine rocks consists of a tool holder with a lengthwise passage for water supply and a cutting tool cartridge as a core with through microcanals connecting the surface of the cutting tool cartridge working part with the lengthwise passage of the tool holder. Outlet holes of the microcanals on the surface of the cutting tool cartridge are made as contour rows positioned throughout the entire length of the working surface forming a cone. This structure increases the distance between the rows of the outlet holes as it gets further away from the top of the core, and the density of distribution of the microcanal external holes on the working surface of the cutting tool cartridge rises toward the top of the core.

EFFECT: extended life of a cutting tool and decreased wear of the cutting tool cartridge.

1 dwg

FIELD: mining.

SUBSTANCE: toolhead for drawknife cutter features mounting pocket open from above for receiving cutter liner limited at the ends with two lateral, one front and one back supporting walls forming drawknife cutter support located mainly in the middle part of back supporting wall and descending to the outer areas. End side of the back support wall directed to the mounting pocket features guiding surfaces in the outer areas, the said guiding surfaces descending inside at an angle to the mounting pocket and serving as an auxiliary mounting device for drawknife cutter.

EFFECT: excellent support of inserted cutter and fast and simple cutter mounting.

8 cl, 4 dwg

FIELD: mining.

SUBSTANCE: toolhead for drawknife cutter features mounting pocket open from above for receiving and supporting cutter liner limited at the ends with two lateral walls in relation to the operation drawknife direction, a front and a back supporting walls, the latter being higher than the former. One lateral support wall oriented away from breakage face during operation is higher than the front and the other lateral walls and forms a lateral cutter liner support longer than the other lateral support wall.

EFFECT: prolonged work life.

20 cl, 6 dwg

FIELD: construction.

SUBSTANCE: invention relates to the field of construction, in particular the construction equipment for processing surfaces of the ground with a milling drum. The construction equipment for processing a surface of the ground by a milling drum, on whose surface is located a large number of blade holders, and in the jack for holding the blades of the blade holders placed with the possibility of replacing the blades, in particular a blade with a round shank, and moreover by means of the device for tool replacement is carried out or blades from blade holders and/or mounts it. The milling drum is supplied with the device for tool replacement, the adjusting device is intended for positioning the milling drum or the blade in relation to at least one adaptation for tool replacement and/or the actuating unit provides the positioning, at least one adaptation for tool replacement relative to the milling device, the actuating unit and/or the adjusting device has a measuring system for determining the position, and moreover the actuating unit and/or the adjusting device are supplied with a digital control device.

EFFECT: simplification in the replacement of blades.

30 cl, 5 dwg

Improved ripper tip // 2434998

FIELD: mining.

SUBSTANCE: ripper tip includes replaceable tooth and attached seat in top cover of ripper tip. Ripper tooth is protected against rotation within the above top cover of ripper tip owing to locking heavy-shrink fitting so that the replaceable ripper tooth does not rotate when it is being used. Locking heavy-shrink fitting prevents penetration of solid particles into the gap between the walls of the above tooth and the above attached seat. Tooth has locking cone-shaped stock, and the above seat is provided with cone-shaped hole to be adjoined to the above locking cone-shaped stock. Tooth is cone-shaped and ends with a tip. Tip is made from high-strength material. Ripper tooth includes head section made at least partially from high-strength material. Top cover and ripper tooth form conjugation between seat and stock of ripper tooth having the corresponding shape; at that, seat and stock of ripper tooth have inner cone for formation of clamping cone between top cover and tooth; at that, ripper tooth is removed from cover in case of failure of clamping cone. Seat with inner cone forms some part of section for arrangement of ripper tooth in the cover, and the above stock of ripper tooth having the corresponding shape forms the part of ripper tooth. In stock of ripper tooth and section for arrangement of ripper tooth there made are through transverse channels the axial lines of which are aligned in case of fixture in the seat of stock of ripper tooth, which allows inserting the retaining pin. Head section of ripper tooth includes outward protruding arm enabling removal of ripper tooth. Section for arrangement of ripper tooth includes displacement hole that passes from external section of ripper tip to the area of base of the above seat, which allows displacing the tooth at available corresponding tool.

EFFECT: improving wear resistance and service life and economic effectiveness.

21 cl, 14 dwg

FIELD: construction.

SUBSTANCE: earth mover comprises a support device, a worn part, a shock-free installed connection system, a clamp, a wedge and an adjustment accessory. The worn part is an adapter, and the support device is a front edge of a bucket. The shock-free installed system is made with the possibility to install the worn part and to remove it on the support device.

EFFECT: simplified design, convenience of installation and removal without driving in and out.

28 cl, 2 dwg

FIELD: construction.

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

FIELD: transport.

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

FIELD: construction.

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

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

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.

3 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: 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: 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: 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

Up!