CN219529004U

CN219529004U - Novel cat claw drill bit

Info

Publication number: CN219529004U
Application number: CN202223436120.5U
Authority: CN
Inventors: 左克飞; 荣华
Original assignee: SHAREATE TOOLS Ltd
Current assignee: SHAREATE TOOLS Ltd
Priority date: 2022-12-20
Filing date: 2022-12-20
Publication date: 2023-08-15
Anticipated expiration: 2032-12-20

Abstract

The utility model relates to a novel cat claw drill bit, which comprises a drill bit body (1) and coal cutting teeth (5), wherein the drill bit body (1) is provided with a coal cutting tooth mounting hole (6), and the handle part of the coal cutting teeth (5) is embedded in the coal cutting tooth mounting hole (6); the method is characterized in that: grooves (51) are formed in the circumferential direction of the handle of the coal cutting tooth (5), grooves (61) are correspondingly formed in the hole wall of the coal cutting tooth mounting hole (6), and the two corresponding grooves are internally and externally spliced to form a pin channel (7) extending in the circumferential direction of the coal cutting tooth; a pin hole (8) is formed in the drill bit body (1) from the outer side to the pin channel (7), the end part of the pin hole (8) is communicated with the pin channel (7), and the pin hole (8) is tangential to the pin channel (7); the pin hole (8) is internally provided with a pin (9), the tail end of the pin (9) stretches into the pin channel (7) and extends and deforms along the pin channel (7) so as to clamp and fix the coal cutting teeth (5) in the axial direction.

Description

Novel cat claw drill bit

Technical Field

The utility model relates to the technical field of mining drill bits, in particular to a novel cat claw drill bit.

Background

The cat claw type mining drill bit is generally suitable for open pit mining of soft coal beds (F < 1.5) and extremely soft coal beds (1.5 > F > 0.8), and has the characteristics of high cutting efficiency, replaceable cutting part coal cutting teeth, long service life of a drill bit body and the like. The cutting part coal cutting tooth is arranged on the drill bit body, belongs to a loss piece, and can be continuously used after being replaced by a new coal cutting tooth after being damaged and severely worn in the use process.

In the prior cat claw drill bit structure, as shown in fig. 1, when installing the coal-cutting tooth 2, the coal-cutting tooth 2 is knocked into the coal-cutting tooth installation hole 3 on the drill bit body 1 (the spring piece 21 on the coal-cutting tooth 2 is contracted in the knocking-in process, after the coal-cutting tooth 2 is installed in place, the spring piece 21 resets in the rectangular groove 31 of the coal-cutting tooth installation hole 3 to realize the installation of the coal-cutting tooth 2), when disassembling the coal-cutting tooth 2, a special disassembling tool 4 is needed, as shown in fig. 2, the pulling head 41 of the tool is installed in the clamping groove at the head part of the coal-cutting tooth 2, the punch 42 is rapidly moved to impact the handle 43 at the tail end of the tool, and the pulling tooth is realized by the impact force generated when the punch 42 impacts the handle 43. The operation of this disassembling mode requires the rapid movement of the punch 42, and a certain impact force is required to be generated to take out the coal cutter teeth 2, which is inconvenient to operate. In addition, after the coal cutting teeth 2 are worn for a period of time, broken teeth may occur, and the broken teeth are located near the clamping grooves of the head, as shown in fig. 3. Once the tooth breakage occurs, the pulling head 41 of the tool cannot be installed in the clamping groove of the head part of the coal cutting tooth 2, the rest coal cutting teeth 2 cannot be disassembled, the new coal cutting teeth 2 cannot be replaced for continuous use, and further the drill bit body 1 cannot be used continuously, so that the service life of the drill bit body 1 is influenced.

Disclosure of Invention

The utility model provides a cat claw drill bit adopting a novel assembly mode of coal cutting teeth, which aims to solve the problem that the prior cat claw drill bit structure is inconvenient to disassemble the coal cutting teeth, and a drill bit body is scrapped in advance because the broken teeth cannot be taken out.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the novel cat claw drill bit comprises a drill bit body and coal cutting teeth, wherein the drill bit body is provided with a coal cutting tooth mounting hole, and a handle part of the coal cutting teeth is embedded in the coal cutting tooth mounting hole; a first groove is formed in the circumferential direction of the handle part of the coal cutting tooth, a second groove is correspondingly formed in the hole wall of the coal cutting tooth mounting hole, and the two corresponding grooves are internally and externally spliced to form a pin channel extending in the circumferential direction of the coal cutting tooth; a pin hole is formed in the drill bit body from the outer side to the pin channel, the end part of the pin hole is communicated with the pin channel, and the pin hole is tangent to the pin channel; the pin hole is internally provided with a pin, the tail end of the pin extends into the pin channel and extends and deforms along the pin channel so as to clamp and fix the coal cutting teeth in the axial direction.

In the scheme, the pin channel is an annular groove surrounding the circumference of the coal cutting tooth.

In the scheme, the length of the pin extending into the pin channel accounts for 1/4-1/2 of the circumference of the coal cutting tooth handle.

In the scheme, the pin is provided with the head part exposed out of the pin hole, and the head part of the pin is used for pulling out the pin.

In the above scheme, the tail end of the pin is provided with a guiding tip.

Further, the guide tip angle is 30-60 degrees.

In the above scheme, the first groove of the coal cutter tooth is a semicircular section, and the second groove of the coal cutter tooth mounting hole is also a semicircular section, so that the spliced pin channel is a circular section.

In the above scheme, the diameter of the pin channel is larger than the diameter of the pin hole, and the diameter of the pin hole is larger than the diameter of the pin so as to accommodate the pin.

Compared with the existing structure, the utility model solves the problem of laborious disassembly of the coal cutting teeth under the condition of retaining the advantages of the installation of the coal cutting teeth; more importantly, the problem that the coal cutting tooth cannot be disassembled after the tooth breakage of the head part of the coal cutting tooth is solved, and the coal cutting tooth is simple in structure and convenient to process.

Drawings

FIG. 1 is a schematic diagram of an assembly structure of a prior art coal cutter;

FIG. 2 is a schematic diagram of a prior art tooth removal process;

FIG. 3 is a schematic diagram of a prior art broken tooth;

FIG. 4 is an overall schematic perspective view of a cat-claw drill bit according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of an assembly structure of a coal cutter according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of the junction of a tooth and annular groove of an embodiment of the present utility model, the view being taken radially of the tooth;

fig. 7 is a schematic diagram of the cooperation of the coal cutter teeth and the pins according to the embodiment of the utility model.

In the above figures: 1. a bit body; 11. a recess; 2. coal cutting teeth; 21. a spring piece; 3. mounting holes of coal cutting teeth; 31. rectangular grooves; 4. a special dismounting tool; 41. pulling out the head; 42. a punch; 43. a handle; 5. coal cutting teeth; 51. a first groove; 6. mounting holes of coal cutting teeth; 61. a second groove; 7. a pin channel; 8. a pin hole; 9. a pin; 91. a head.

Description of the embodiments

The utility model is further described below with reference to the accompanying drawings and examples:

examples: see fig. 4-7:

the utility model provides a novel cat claw drill bit, see the fig. 4 and show, including bit body 1 and coal cutting tooth 5, offered on the bit body 1 and cut coal tooth mounting hole 6, the stalk portion of coal cutting tooth 5 inlays in cutting coal tooth mounting hole 6.

Referring to fig. 5, a first groove 51 is formed in the circumferential direction of the shank of the coal cutter tooth 5, and the plane of the first groove 51 is perpendicular to the axial direction of the coal cutter tooth 5. The hole wall of the coal cutting tooth mounting hole 6 is correspondingly provided with a second groove 61, the second groove 61 is a whole circle in the circumferential direction, and the plane of the second groove 61 is also perpendicular to the axial direction of the coal cutting tooth 5. When the handle of the coal cutting tooth 5 is embedded in the coal cutting tooth mounting hole 6, the first groove 51 and the second groove 61 are spliced inside and outside to form a pin channel 7 extending in the circumferential direction of the coal cutting tooth, and the pin channel 7 is an annular groove surrounding the circumferential direction of the coal cutting tooth 5. Specifically, as shown in fig. 5, the first groove 51 and the second groove 61 are both semicircular in cross section, and the pin channel 7 formed by the split pin is circular in cross section.

Referring to fig. 5, the drill bit body 1 is provided with a pin hole 8 extending from the outside to the pin channel 7, the end of the pin hole 8 is communicated with the pin channel 7, and the pin hole 8 is tangential to the pin channel 7.

Referring to fig. 5, 6 and 7, a pin 9 is disposed in the pin hole 8, and the tail end of the pin 9 extends into the pin channel 7 and deforms along the pin channel 7 to axially clamp the coal-cutting teeth 5.

Preferably, as shown in fig. 6, the length of the pin 9 extending into the pin channel 7 occupies 1/4-1/2 of the circumference of the shank portion of the coal cutting tooth 5.

Referring to fig. 6 and 7, the pin 9 has a head 91 exposed outside the pin hole 8, and the head 91 of the pin 9 is used for the nail pulling operation. Preferably, as shown in fig. 6, a recess 11 is provided on the outer surface of the bit body 1 corresponding to the head 91 of the pin 9 such that the head 91 of the pin 9 is placed in the recess 11, but the recess 11 is significantly larger in size than the head 91 to facilitate manipulation with the forceps holder head 91.

Preferably, as shown in fig. 6, the tail end of the pin 9 is provided with a guiding tip for guiding when the pin is inserted. The angle of the guide tip is preferably 30-60 deg..

The first groove 51 of the coal cutting tooth 5 and the second groove 61 in the coal cutting tooth mounting hole 6 are opposite in axial position, namely the circle centers are on the same height of the coal cutting tooth 5 after mounting, the diameter of a pin channel 7 formed by the two grooves is larger than that of the pin 9, and the pin 9 can be ensured to enter and be pulled out.

The diameter of the pin hole 8 on the drill bit body is larger than that of the pin 9, so that the pin 9 can be inserted and pulled out; meanwhile, the pin hole 8 on the drill bit body 1 is in tangential relation with the pin channel 7, so as to ensure that the pin 9 can smoothly enter the pin channel 7.

The pin 9 is made of carbon steel or spring steel, has hardness below HRC25 and certain deformability, and can deform in the annular groove.

During assembly, the pin 9 enters the pin channel 7 after being inserted into the distribution hole 8 to be bent and deformed, and the axial limit and the installation of the coal cutting teeth 5 are realized by the pin in the pin channel 7.

In the use process, the stress of the coal cutting teeth 5 is mainly borne by the coal cutting teeth mounting holes 6, and the pin 9 is not stressed in the axial direction, so that the reliability of the structure is ensured. When the coal cutting teeth 5 are damaged or worn to be replaced, the heads of the pins 9 are clamped by pliers, and the pins 9 are pulled out; after the pin 9 is pulled out, the coal cutting teeth 5 are not limited to be axially outwards, and the coal cutting teeth 5 can be easily taken out by hands. Even if the head of the coal cutter tooth 5 is broken, the rest of the handle can be taken out by the self weight of the coal cutter tooth 5 after the pin 9 is taken out.

The utility model solves the problem of laborious disassembly of the coal cutting teeth 5 under the condition of keeping the advantages of the installation of the coal cutting teeth 5; more importantly, the problem that the coal cutting teeth 5 cannot be disassembled after the teeth are broken at the head parts of the coal cutting teeth 5 is solved, and the coal cutting teeth are simple in structure and convenient to process.

The above embodiment is a practical example, and in practice, the following variations are also possible:

1. the cross-sectional shapes of the first groove 51 of the coal cutter tooth 5 and the second groove 61 in the coal cutter tooth mounting hole 6 are not necessarily semicircular, and can be other shapes as long as the pin 9 can be accommodated;

2. the plane of the first groove 51 of the coal cutting tooth 5 and the plane of the second groove 61 in the coal cutting tooth mounting hole 6 are not necessarily perpendicular to the axial direction, and the planes are inclined to some extent, so long as the first groove 51 of the coal cutting tooth 5 and the second groove 61 in the coal cutting tooth mounting hole 6 are matched and can be opposite;

3. the first groove 51 of the coal cutter tooth 5 and the second groove 61 in the coal cutter tooth mounting hole 6 do not have to be a circle of grooves around the circumference, but may be a section of long groove in the circumference, and the first groove 51 of the coal cutter tooth 5 and the second groove 61 in the coal cutter tooth mounting hole 6 can be opposite as long as they are matched.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims

1. The novel cat claw drill bit comprises a drill bit body (1) and coal cutting teeth (5), wherein coal cutting teeth mounting holes (6) are formed in the drill bit body (1), and the handle parts of the coal cutting teeth (5) are embedded in the coal cutting teeth mounting holes (6); the method is characterized in that: a first groove (51) is formed in the circumferential direction of the handle part of the coal cutting tooth (5), a second groove (61) is correspondingly formed in the hole wall of the coal cutting tooth mounting hole (6), and the two corresponding grooves are spliced inside and outside to form a pin channel (7) extending in the circumferential direction of the coal cutting tooth; a pin hole (8) is formed in the drill bit body (1) from the outer side to the pin channel (7), the end part of the pin hole (8) is communicated with the pin channel (7), and the pin hole (8) is tangential to the pin channel (7); the pin hole (8) is internally provided with a pin (9), the tail end of the pin (9) stretches into the pin channel (7) and extends and deforms along the pin channel (7) so as to clamp and fix the coal cutting teeth (5) in the axial direction.

2. The novel cat-claw drill according to claim 1, wherein: the pin channel (7) is an annular groove which surrounds the circumference of the coal cutting tooth (5).

3. A novel cat-claw drill according to claim 1 or 2, characterized in that: the length of the pin (9) extending into the pin channel (7) accounts for 1/4-1/2 of the circumference of the handle part of the coal cutting tooth (5).

4. A novel cat-claw drill according to claim 1 or 2, characterized in that: the pin (9) is provided with a head (91) exposed out of the pin hole (8), and the head (91) of the pin (9) is used for pulling out the pin.

5. A novel cat-claw drill according to claim 1 or 2, characterized in that: the tail end of the pin (9) is provided with a guiding tip.

6. The novel cat-claw drill according to claim 5, wherein: the included angle of the tip for guiding is 30-60 degrees.

7. The novel cat-claw drill according to claim 1, wherein: the first groove (51) of the coal cutting tooth (5) is of a semicircular section, and the second groove (61) of the coal cutting tooth mounting hole (6) is of a semicircular section, so that the pin channel (7) formed by splicing is of a circular section.