CN213205668U

CN213205668U - Round rod cutting pick

Info

Publication number: CN213205668U
Application number: CN202021578168.8U
Authority: CN
Inventors: 苗祥; 秦鹏程
Original assignee: Suzhou Wuyuansu Machinery Manufacturing Co ltd
Current assignee: Jiangsu Wuyuan Machinery Manufacturing Co ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2021-05-14
Anticipated expiration: 2030-08-03

Abstract

The utility model relates to a round bar pick, which comprises a pick body and a tip part, wherein the pick body consists of an upper end part and a lower handle part, and the pick body is provided with a central axis L; the tip part is made of hard alloy materials and is fixed at the upper end of the end part, the middle part of the end part is at least provided with a first annular groove, a second annular groove and a third annular groove from top to bottom around a central axis L, and a bulge part and a longitudinal concave part are arranged at the lower part of the end part around the central axis L; the utility model discloses a round bar pick can rotate in a flexible way when the operation to the resistance of minimize pick in work, the broken material is treated in the cutting fast, and the wearing and tearing of the pick body that causes when the gasket can effectively prevent to cut the slope in addition increase the life of pick, are fit for using widely.

Description

Round rod cutting pick

Technical Field

The utility model relates to a heading machine technical field, concretely relates to round bar pick is the leading tool of coal breakage and garrulous coal for the vulnerable part in the heading machine one of, is.

Background

The heading machine is mechanical equipment for heading underground coal mine tunnels, railway tunnels, road tunnels and mine tunnels, the cutting head is an execution mechanism of the heading machine, and cutting teeth arranged on a tooth holder of the cutting head are elements for directly finishing a coal rock breaking task. The cutting pick is used as a tool for breaking coal rocks, and has the problems that the cutting pick is softened due to the fact that the temperature is increased along with the increase of working time besides the high compressive stress, shearing stress and impact load, and the abrasion of the cutting pick is accelerated. The mining cutting pick can be divided into a pickaxe-shaped cutting pick and a flat cutting pick, and the existing heading machine mainly uses the pickaxe-shaped cutting pick. Pick-shaped cutting teeth are generally formed by brazing an alloy steel tooth body and a hard alloy tool bit, and the use performance of the cutting teeth depends on the material of the tooth body, the performance of hard alloy and the quality of a brazed joint.

In order to further improve the working efficiency of the heading machine, improve the reliability of the cutting teeth and reduce the loss of the cutting teeth, it is necessary to analyze the main reasons of failure of the cutting teeth of the heading machine. Through investigation and analysis, the cutting pick mainly has the problems of abrasion, falling off of the hard alloy tool bit, fragmentation of the hard alloy tool bit and the like in the working process. The degree of pick wear depends primarily on the hardness of the coal and its corrosiveness. According to the theory of abrasion, the abrasion of metal by coal belongs to abrasive abrasion and is caused by hard minerals in coal, such as quartz, pyrite and the like. Wear is caused by the grooves cut into the surface of the cutting pick head. The corrosive action of the downhole environment also greatly exacerbates the wear of the cutting pick material. Wear damage has 2 forms: hard alloy tool bit wear and tooth wear. The alloy contains graphite impurities, has uneven crystal grain distribution, more gaps and uneven structure, and is the main reason for causing the early abrasion of the hard alloy cutter head; the quality and performance of the tooth body material are unstable, and the poor control of the heat treatment process is the reason of the abrasion of the tooth body. Eccentric wear of pick-shaped cutting teeth often occurs in work. Because the part of the pick-shaped cutting tooth participating in cutting is a cone and the part contacting with the coal rock is a conical surface, if the cutting tooth can not freely rotate in the tooth holder due to interference, environmental pollution or other reasons during working, the eccentric wear phenomenon can occur. The occurrence of eccentric wear phenomenon increases cutting resistance, seriously wears, and reduces the service life of the cutting pick, even falls off.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a round bar pick, in order to make pick and gasket wearing and tearing even, prolong its life, the pick must guarantee the rotation that takes place simultaneously when cutting into coal petrography or mineral for each part global of pick and gasket all contacts with the coal petrography material, thereby even wearing and tearing.

This purpose is realized through the following technical scheme:

a round bar cutting pick comprises a cutting pick body and a tip part, wherein the cutting pick body is composed of an end part and a handle part and is provided with a central axis L, the tip part is composed of hard alloy materials and is embedded in a molten pool of the end part through a special welding process, a first annular groove, a second annular groove and a third annular groove are arranged in the middle of the end part around the central axis L, and a convex part and a longitudinal concave part are arranged in the lower part of the end part around the central axis L.

Preferably, the first annular groove, the second annular groove and the third annular groove are distributed at intervals in the middle of the cutting pick.

Preferably, the projection is formed of a plurality of rib-shaped bodies, and a single rib-shaped body has a first action surface, a second action surface, and a third action surface.

Preferably, the longitudinal recess consists of a number of individual grooves, each individual groove comprising a first working surface and a second working surface.

Further, the convex portions and the longitudinal concave portions are arranged to intersect circumferentially around the central axis L.

Preferably, the raised portion extends along a middle transition of the pick body towards the bottom outer contour surface.

Preferably, the longitudinal recess extends along a middle transition of the pick body towards the bottom outer contour surface.

Preferably, the transition between the end bottom and the handle is provided with a mounting stop surface.

Preferably, the handle comprises segmented first, second, third and fourth cylinders.

Further, the outer contour surface has a diameter a, the first cylinder has a diameter b, the second cylinder has a diameter c, the third cylinder has a diameter d, the fourth cylinder has a diameter e, and the diameter a > diameter b > diameter c > diameter d; diameter c = diameter e. The size range of the diameter a is 60mm-80 mm; the diameter b ranges from 40mm to 50mm in size; the diameter c ranges from 30mm to 35mm in size; the diameter d ranges from 25mm to 30mm in size; the diameter e ranges in size between 30mm and 35mm, wherein a tightening steel sleeve is provided at the periphery of the shank, and the tightening steel sleeve comprises at least one stop member which is arranged circumferentially of the tightening steel sleeve and acts in an annular recess of the shank.

Compared with the prior art, the utility model, following beneficial effect has:

optimizing the wear design, wherein the convex part of the pick body consists of a plurality of rib-shaped bodies, a single rib-shaped body is provided with a first action surface, a second action surface and a third action surface, the longitudinal concave part of the pick body consists of a plurality of independent grooves, and each independent groove comprises a first working surface and a second working surface; at the same time, the cutting pick shim is provided with recesses in its radially outer circumferential region, which recesses form an intrusion zone for milled coal rock material which carries circumferential tangential forces into the shim, which therefore induces a rotational movement of the cutting pick shim, which improves the free rotation, which produces as little rotational wear as possible in relation to the cutting pick holder. Whilst the pick is able to maintain good rotation so that it wears evenly around its entire periphery.

Drawings

The invention is explained in detail below with reference to examples shown in the drawings.

Wherein:

FIG. 1 is a front view of a round bar pick;

FIG. 2 is a perspective view of the rod pick;

FIG. 3 is a front view of the pick body;

figure 4 is a full sectional view of a round bar pick assembled in a pick box.

Detailed Description

Fig. 1 and 2 show a round bar cutting pick comprising a pick body 8, a tip 1, wherein the pick body 8 is formed of an end portion 2, a shank portion 3 and has a central axis L, the tip 1 being formed of a super-hard alloy material such as carbide, diamond, polycrystalline diamond or other diamond-like hardness material. The carbide in the tip is an alloy of tungsten carbide, which ensures sufficient hardness and wear resistance, and cobalt, which is relatively "softer" and binds the tungsten carbide particles together, thereby ensuring a desired breaking strength even at the highest impact loads, and which is embedded in the weld pool of the tip 2 by a special welding process, the tip 2 being provided in the middle around the central axis L with a first annular groove 2.1, a second annular groove 2.2, a third annular groove 2.3, and in the lower part of the tip 2 around the central axis L with a bulge 6 and a longitudinal recess 7.

The first annular groove 2.1, the second annular groove 2.2 and the third annular groove 2.3 are distributed at intervals in the middle of the cutting pick. The annular groove can increase the contact area of the end part of the cutting pick and the coal rock material and is an external representation for testing the service life and the service condition of the cutting pick.

The projection 6 extends along the middle transition 2.5 of the pick body 8 towards the bottom outer contour surface 2.4. The longitudinal recess 7 extends along the middle transition 2.5 of the pick body 8 towards the bottom outer contour surface 2.4. The bulge 6 is composed of a plurality of rib-shaped bodies, and each rib-shaped body is provided with a first acting surface 6.1, a second acting surface 6.2 and a third acting surface 6.3. The longitudinal recess 7 consists of several separate grooves, each of which comprises a first working surface 7.1 and a second working surface 7.2. The projections 6 are arranged circumferentially crosswise with respect to the longitudinal recesses 7 about the central axis L. The design aims and basis are to increase the contact area of the cutting pick and the coal rock material, and in the process that the cut coal rock material is continuously in contact with the first working surface 6.1, the second working surface 6.2 and the third working surface 6.3 of the rib-shaped body of the bulge 6 and the first working surface 7.1 and the second working surface 7.2 of the independent groove of the longitudinal concave part 7, the shape similar to the fluid motion is formed, and additional driving friction force is generated, so that the cutting pick is pushed to continuously rotate in the cutting pick seat, and similarly, a plurality of flow guide parts 40 are arranged on the gasket 4, and each flow guide part 40 comprises a first flow guide surface 41, a second flow guide surface 42 and a third flow guide surface 43 and is also used for guiding the coal rock crushed aggregates and driving the gasket to rotate, so that the problems existing in the conventional cutting pick working process are effectively solved.

As shown in fig. 3, the handle 3 comprises a segmented first cylinder 3.1, second cylinder 3.2, third cylinder 3.3, fourth cylinder 3.4. The outer contour surface 2.4 has a diameter a, the first cylinder 3.1 has a diameter b, the second cylinder 3.2 has a diameter c, the third cylinder 3.3 has a diameter d, the fourth cylinder 3.4 has a diameter e, and the diameter a > diameter b > diameter c > diameter d; diameter c = diameter e. The size range of the diameter a is 60mm-80 mm; the diameter b ranges from 40mm to 50mm in size; the diameter c ranges from 30mm to 35mm in size; the diameter d ranges from 25mm to 30mm in size; the diameter e ranges from 30mm to 35mm in size; the pick outer contour face 2.4 and the first through fourth cylinders are of coaxial design, formed about the central axis L. A first stop surface 10.1 is arranged on the step surface connecting the first cylinder 3.1 and the second cylinder 3.2; a second stop surface 10.2 is arranged on the step surface connecting the second cylinder 3.2 and the third cylinder 3.3; a third stop surface 10.3 is provided on the step surface where the third cylinder 3.3 and the fourth cylinder 3.4 are connected.

As shown in fig. 4, the rod pick is provided with a shim 4 which is mounted in the first cylinder 3.1 of the shank 3 by means of an internal bore 46. The cutting pick is mounted in the pick holder 9 in the working position, the bottom of the pick end 2 at the transition to the shank 3 is provided with a mounting stop surface 2.6 for mating contact with the bearing surface 44 of the shim 4, and the shim 4 is provided with a support surface 47 for mating contact with the bearing surface 9.1 of the pick holder 9 and transmitting cutting forces from the pick tip 1.

Wherein a set steel sleeve 5 is provided at the periphery of the shank 3, the set steel sleeve 5 being made of a planar material, the stopper portion 50 being formed by punching out from the planar material, being formed at the surface of the set steel sleeve 5, and being recessed from the surface to the inside, forming the stopper portion 50 and being shown in the area surrounded by the set steel sleeve 5. The clamping steel sleeve 5 can be brought from a relaxed state into a clamped state or from a semi-clamped state into a clamped state through the inner bore 46 of the spacer 4. The stop 50 is furthermore cut out along a punching edge, the clamping steel sleeve 5 being rolled up, so that an annular inner circular surface 5.4 results. The tightening steel sleeve 5 comprises three limiting portions 50, each limiting portion 50 having a first limiting surface 5.1 and a second limiting surface 5.2. The stop 50 is radially distributed in the tightening steel sleeve 5 and acts in the third cylinder 3.3 of the shank 3.

Fig. 4 shows that the first 10.1, second 10.2 and third 10.3 stop surfaces are arranged opposite the first 5.1, second 5.2 and third 5.3 stop surfaces of the tightening steel sleeve 5 and form an interlocking relationship with each other. The first limiting surface 5.1 is arranged in parallel with the first stopping surface 10.1, the second limiting surface 5.2 and the second stopping surface 10.2, and the third limiting surface 5.3 and the third stopping surface 10.3, and a certain working movable gap is reserved between the corresponding surfaces, so that the axial movement and the circumferential rotation of the cutting pick in a certain distance can be kept, coal rock or mineral aggregate powder generated in the cutting process can be removed to block a reserved gap inside the cutting pick through the axial movement and the rotation, and the first stopping surface 10.1, the second stopping surface 10.2 and the third stopping surface 10.3 have a working contact relation with the first limiting surface 5.1, the second limiting surface 5.2 and the third limiting surface 5.3 of the fastening steel sleeve 5, and the contact relation is particularly strong friction and generates mutual abrasion due to the high-speed rotation of the cutting pick during working, the three limiting surfaces have larger areas, are beneficial to reducing the pressure intensity generated by the mutual friction, enhance the working stability, reduce the abrasion between the cutting pick handle part 3 and the tightening steel sleeve 5, obviously prolong the service life of the cutting pick and enhance the use effect in the working cutting process.

It should be noted that the drawings of the present embodiment are in a very simplified form and all use non-precise ratios, and are only used for convenience and clarity to aid in the description of the embodiments of the present invention.

It should be understood that the above-mentioned embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, and therefore, the protection scope of the present invention should not be limited thereby. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A round bar cutting pick comprises a cutting pick body (8) and a tip (1), wherein the cutting pick body (8) is composed of an upper end part (2) and a lower handle part (3), and the cutting pick body is provided with a central axis L; the tip part (1) is made of hard alloy materials and is fixed at the upper end of the end part (2), and the tip part is characterized in that the middle part of the end part (2) is at least provided with a first annular groove (2.1), a second annular groove (2.2) and a third annular groove (2.3) from top to bottom around a central axis L, and a protruding part (6) and a longitudinal concave part (7) are arranged around the central axis L at the lower part of the end part (2).

2. A rod pick according to claim 1, wherein the first (2.1), second (2.2) and third (2.3) annular grooves are evenly spaced, progressively spaced or progressively spaced.

3. A round cutting pick according to claim 1, wherein the boss (6) is formed by a plurality of ribs, each rib having a first active surface (6.1), a second active surface (6.2) and a third active surface (6.3).

4. A rod pick according to claim 3, wherein the longitudinal recess (7) consists of a number of separate grooves, each containing a first working surface (7.1) and a second working surface (7.2).

5. A rod pick according to claim 4, wherein the rib intersects the separate groove about the central axis L.

6. A cutting pick according to claim 4, wherein the projection (6) extends along a mid-transition (2.5) of the pick body (8) towards the outer profile surface (2.4) of the base.

7. A round rod pick according to claim 4, wherein the longitudinal recess (7) extends along a middle transition (2.5) of the pick body (8) towards the bottom outer contour surface (2.4).

8. A rod pick according to any one of claims 1 to 7, wherein the bottom of the end portion (2) at the transition to the shank portion (3) is provided with a mounting stop surface (2.6).

9. A round rod pick as claimed in claim 8, wherein the shank (3) is divided into a first (3.1), a second (3.2), a third (3.3) and a fourth (3.4) cylinder in sequence from top to bottom.

10. A round bar pick according to claim 6, wherein the outer contour face (2.4) has a diameter a (30), the first cylinder (3.1) has a diameter b (31), the second cylinder (3.2) has a diameter c (32), the third cylinder (3.3) has a diameter d (33), the fourth cylinder (3.4) has a diameter e (34), and the diameter a > diameter b > diameter c > diameter d; diameter c = diameter e.