阅读说明：本技术 一种硬质合金铣刀 (Hard alloy milling cutter ) 是由 王辰 杨家伟 于 2021-08-17 设计创作，主要内容包括：本发明涉及合金铣刀的技术领域,具体的说是一种硬质合金铣刀,包括有刀齿、刀身和刀齿槽；所述刀齿槽的内部安装有刀齿；所述刀齿的内部开设有台阶孔；所述刀身的内部设有圆孔；所述圆孔的一端位于刀身的内环面上,圆孔的另一端位于刀齿槽的内壁上；所述圆孔的数量与刀身数量一致,且与刀身凸起处呈一一对应关系,圆孔的内部设有钢丝绳；所述刀身的内环面且位于圆孔的一侧开设有凹槽；凹槽的内部滑动设有推块；通过外力推动铣刀杆,使得铣刀杆与刀身进行分离,推块因和凹槽为滑动配合,可以使得推块在凹槽中进行滑动,同时钢丝绳与矩形板的相互配合,进而取出刀齿,解决了刀齿更换和安装中过于繁琐和费事的问题。(The invention relates to the technical field of alloy milling cutters, in particular to a hard alloy milling cutter which comprises cutter teeth, a cutter body and cutter tooth grooves; the inside of the knife tooth groove is provided with knife teeth; step holes are formed in the cutter teeth; a circular hole is formed in the knife body; one end of the round hole is positioned on the inner ring surface of the cutter body, and the other end of the round hole is positioned on the inner wall of the cutter tooth groove; the number of the round holes is consistent with that of the knife bodies, the round holes and the protruding parts of the knife bodies are in one-to-one correspondence, and steel wire ropes are arranged inside the round holes; a groove is formed in the inner ring surface of the knife body and positioned on one side of the round hole; a push block is arranged inside the groove in a sliding manner; promote the cutter arbor through external force for the cutter arbor separates with the blade, and the ejector pad can make the ejector pad slide in the recess because of being sliding fit with the recess, and wire rope and rectangular plate mutually support simultaneously, and then take out the sword tooth, has solved the sword tooth and has changed and too loaded down with trivial details and troublesome problem in the installation.)

1. A hard alloy milling cutter comprises cutter teeth (1), a cutter body (2) and cutter tooth grooves (3); the method is characterized in that: the cutter teeth (1) are arranged in the cutter tooth groove (3); a step hole is formed in the cutter tooth (1); a round hole (4) is formed in the knife body (2); one end of each round hole (4) is located on the inner annular surface of the cutter body (2), the other end of each round hole (4) is located on the inner wall of the corresponding cutter tooth groove (3), the number of the round holes (4) is consistent with that of the cutter tooth grooves (3), the round holes and the cutter tooth grooves (3) are in one-to-one correspondence, and steel wire ropes (5) are arranged inside the round holes (4); a groove (6) is formed in the inner annular surface of the knife body (2) and on one side of the round hole (4); a push block (7) is connected inside the groove (6) in a sliding manner; one end of the push block (7) penetrates through the groove (6) and is in an arc shape; a rectangular plate (9) is arranged at one end of the cutter tooth (1) with a larger step hole; one end of the steel wire rope (5) is fixedly connected with the push block (7), and the other end of the steel wire rope (5) is fixedly connected with the rectangular plate (9).

2. The cemented carbide milling cutter as claimed in claim 1, wherein: the groove bottom of the groove (6) is connected with the other end of the push block (7) through a spring (8).

3. The cemented carbide milling cutter as claimed in claim 2, wherein: the diameter of one end of the stepped hole far away from the knife body (2) is larger than that of the other end; elastic sheets (10) are symmetrically arranged at the larger end of the stepped hole in the cutter tooth (1); the opposite ports of the two elastic sheets (10) are fixedly connected with the rectangular plate (9) together.

4. A cemented carbide milling cutter according to claim 3, characterized in that: one edge of the elastic sheet (10) far away from the step hole in the cutter tooth (1) extends to the outer side of the cutter tooth (1).

5. The cemented carbide milling cutter as claimed in claim 4, wherein: a ball (11) is connected between the groove (6) and the round hole (4) in a rolling manner, and the ball (11) is positioned on the inner annular surface of the knife body (2); the ball (11) is simultaneously contacted with the steel wire rope (5) and the push block (7).

6. The cemented carbide milling cutter as claimed in claim 5, wherein: a diamond-shaped fixed block (13) is arranged at the position, close to the cutter teeth (1), of the cutter body (2); the diamond-shaped fixing block (13) is rotationally connected with the cutter body (2) through a rotating rod, and the long end of the diamond-shaped fixing block (13) is attached to the outer surface of the cutter tooth (1).

Technical Field

The invention relates to the technical field of alloy milling cutters, in particular to a hard alloy milling cutter.

Background

The milling cutter is a rotary cutter which is used for milling and provided with one or more cutter teeth, each cutter tooth sequentially and intermittently cuts off the allowance of a workpiece during working, and the milling cutter is mainly used for processing planes, steps, grooves, forming surfaces, cutting off the workpiece and the like on a milling machine; the milling cutter is divided into: cylindrical milling cutters, face milling cutters, end milling cutters, face-edge milling cutters, angle milling cutters, saw blade milling cutters, and T-shaped milling cutters; the face milling cutter is also called a disc milling cutter, and is used for a vertical milling machine, a processing plane is arranged on an end face milling machine or a gantry milling machine, cutter teeth are arranged on the end face of a cutter body and the circumference, and the cutter teeth are divided into coarse teeth and fine teeth.

For example, a chinese patent with application number CN108723455A discloses a hard alloy milling cutter, which comprises a cutter head, a cutter body, a clamping seat, a cutting edge, a gasket, a bolt, a socket head cap screw, a clamping groove, a protective structure, a protective cover, a clamping sleeve, a connecting block, a screw, a cutter handle, a limiting ball, a connecting rod, a fixing ring, a connecting column, a limiting ring, a fixing rod, a limiting groove and a projection; the protection structure of the technical scheme is arranged outside the knife handle and detachably connected with the knife handle, the protection cover is arranged at the bottom end of the clamping sleeve and can resist chip removal in the process of machining a workpiece by the knife, and the bottom and the side wall of the knife can be machined by the knife edge arranged on the side wall of the knife body and the knife edge positioned on the outer side of the knife body, so that the worn knife edge can be conveniently replaced; but the mode of fixing and detaching the cutting edge in the technical scheme is too complicated and troublesome, thereby causing the limitation of the technical scheme.

In view of this, in order to overcome the above technical problems, the present invention provides a cemented carbide milling cutter, which solves the above technical problems.

Disclosure of Invention

In order to make up for the defects of the prior art, the pushing block provided by the invention is pushed by an external milling cutter rod so as to be synchronously moved and then matched with a rectangular plate through a steel wire rope; thereby fixing the cutter teeth; when the cutter tooth is taken out, the milling cutter rod is pushed by external force, so that the milling cutter rod is separated from the cutter body, the push block can slide in the groove due to the sliding fit of the push block and the groove, and meanwhile, the steel wire rope is matched with the rectangular plate, so that the cutter tooth is taken out, and the problems of complexity and trouble in cutter tooth replacement and installation are solved;

the technical scheme adopted by the invention for solving the technical problems is as follows: the hard alloy milling cutter comprises cutter teeth, a cutter body and cutter tooth grooves; the inside of the knife tooth groove is provided with knife teeth; step holes are formed in the cutter teeth; a circular hole is formed in the knife body; one end of each circular hole is positioned on the inner annular surface of the cutter body, the other end of each circular hole is positioned on the inner wall of the cutter tooth groove, the number of the circular holes is consistent with that of the cutter tooth grooves and is in one-to-one correspondence with the cutter tooth grooves, and steel wire ropes are arranged inside the circular holes; a groove is formed in the inner ring surface of the knife body and positioned on one side of the round hole; a push block is connected inside the groove in a sliding manner; one end of the push block penetrates through the groove and is in an arc shape; a rectangular plate is arranged at the larger end of the stepped hole in the cutter tooth; one end of the steel wire rope is fixedly connected with the push block, and the other end of the steel wire rope is fixedly connected with the rectangular plate;

when the tool bit is used, the existing tool bit and the tool body are mounted and dismounted through an external bolt, the bolt needs to be screwed for fixing when the tool bit is mounted, the bolt needs to be taken out firstly when the tool bit is dismounted, and the tool bit can be dismounted, so that the mounting and dismounting are complicated and troublesome;

therefore, when the cutter teeth are installed, a worker brings the cutter teeth to be installed close to the cutter tooth grooves, the steel wire rope and the rectangular plate penetrate out of the step hole, the width of the rectangular plate is smaller than the diameter of the smaller end of the step opening, the length of the rectangular plate is smaller than the diameter of the larger step hole at the other end, the rectangular plate can penetrate through the step hole when being horizontally placed, the cutter teeth to be installed cannot penetrate through the step hole when being placed in the vertical direction, the worker places the cutter teeth to be installed in the cutter tooth grooves, the size of the cutter tooth grooves is matched with that of the cutter teeth, the cutter teeth cannot fall off under the unfixed condition, the rectangular plate is rotated to enable the rectangular plate to be in the vertical direction and to be attached to the end, with the diameter of the larger step hole, the rectangular plate cannot fall off due to the fact that four corners of the rectangular plate are exactly matched with the diameters of the step holes, the cutter teeth to be placed in the cutter tooth grooves, and the cutter body is held by hand, when the cutter body penetrates through the external milling cutter rod, the milling cutter rod extrudes the push block, so that the push block moves in the groove, the steel wire rope is driven to be pulled, the steel wire rope is gradually brought into the groove along with the movement of the push block as the push block slowly moves into the groove, meanwhile, the other end of the steel wire rope drives the rectangular plate to move and extrudes the cutter teeth, and the cutter teeth are fixed and are more stable in the cutter tooth grooves;

when the push block is pushed by an external milling cutter rod, the push block is pushed to move synchronously, and then the steel wire rope and the rectangular plate are matched with each other; thereby fix the cutter tooth fast, this kind of fixed mode is swift and simple, has improved the efficiency of installation and dismantlement greatly.

Preferably, the groove bottom of the groove is connected with the other end of the push block through a spring; when the milling cutter is in work, when the external milling cutter rod pushes the push block to move, the push block further extrudes the spring, so that the steel wire rope becomes in a tight state and the rectangular plate is tensioned, and the rectangular plate extrudes the cutter teeth, so that the cutter teeth are more stable and cannot fall off; when external milling cutter arbor took out, the spring resets, drives the ejector pad and resets, and the resetting of ejector pad and then drive wire rope and remove, and at this moment wire rope becomes the state of relaxing by the state of tightening, and the extrusion force between fixed plate and the sword tooth diminishes simultaneously, plays the protection effect, and the spring can let the ejector pad reset, and the ejector pad can not the roll-off recess, can play the effect of preventing falling to the ejector pad.

Preferably, the diameter of one end of the stepped hole, which is far away from the knife body, is larger than that of the other end of the stepped hole; the larger end of the stepped hole is symmetrically provided with elastic sheets; the opposite ports of the two elastic sheets are fixedly connected with the rectangular plate together; the during operation, extrude the shell fragment by the staff, make the shell fragment take place to deform, and pass the step hole along with the removal of rectangular plate, when the rectangular plate was put into the step hole, not hard up shell fragment, the shell fragment resets, make the outer anchor ring of shell fragment and the inner wall in step hole contact, make the area of contact between shell fragment and the step hole increase, because shell fragment and elastic force, there is frictional force between shell fragment and the step hole again, thereby can make the stable subsides of shell fragment on the step hole inner wall, the shell fragment is connected with the rectangular plate again, the steady setting of rectangular plate has been increased, make the cutter tooth more stable when the rectangular plate extrudes the cutter tooth.

Preferably, one edge of the elastic sheet, which is far away from the step hole in the cutter tooth, extends to the outer side of the cutter tooth; during operation, the shell fragment is because of extending to the outside of sword tooth, and the staff of being convenient for more kneads the shell fragment, taking out and placing of the shell fragment of being convenient for.

Preferably, a ball is connected between the groove and the round hole in a rolling manner and is positioned on the inner annular surface of the knife body; the ball is simultaneously contacted with the steel wire rope and the push block; during operation, through the roll connection of ball, can protect wire rope for wire rope does not contact with the corner between round hole and the recess at the in-process that removes, in order to reduce the friction, increases wire rope life.

Preferably, a diamond-shaped fixed block is arranged at the position, close to the cutter teeth, of the cutter body; the rhombic fixed block is rotationally connected with the cutter body through the rotating rod, and one long end of the rhombic fixed block can be attached to the outer surface of the cutter tooth after being rotated; during operation, through rotating the rhombus fixed block, rhombus fixed block turned angle is 90 degrees only, when the rhombus fixed block rotates and is the vertical state, is used for extrudeing the sword tooth for sword tooth and sword tooth groove matched with are more stable, and when the rhombus fixed block rotated the level, do not contact with the sword tooth, make the sword tooth not influenced when taking out.

The invention has the following beneficial effects:

1. according to the invention, the milling cutter rod is pushed by external force, so that the milling cutter rod is separated from the cutter body, the push block can slide in the groove due to the sliding fit of the push block and the groove, and meanwhile, the steel wire rope is matched with the rectangular plate, so that the cutter teeth are taken out, and the problems of complexity and trouble in cutter tooth replacement and installation are solved;

2. according to the invention, the elastic sheet is extruded to deform and penetrates through the step hole along with the movement of the rectangular plate, when the rectangular plate is placed into the step hole, the elastic sheet is loosened and reset, so that the outer ring surface of the elastic sheet is contacted with the inner wall of the step hole, the contact area between the elastic sheet and the step hole is increased, and as the elastic sheet and the elastic sheet have elasticity, friction force exists between the elastic sheet and the step hole, the elastic sheet can be stably attached to the inner wall of the step hole, the elastic sheet is connected with the rectangular plate, the stable shape of the rectangular plate is increased, and the cutter teeth of the rectangular plate are more stable when the cutter teeth are extruded;

3. according to the invention, the steel wire rope can be protected through the rolling connection of the balls, so that the steel wire rope is not contacted with the corner between the round hole and the groove in the moving process, the friction is reduced, and the service life of the steel wire rope is prolonged.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective sectional view of the present invention;

FIG. 3 is a schematic view showing the positional relationship between a circular hole and a groove;

FIG. 4 is a schematic view of the connection between the cutter teeth, the cutter body and the diamond-shaped fixing block;

FIG. 5 is a schematic view of the connection between the wire rope, the rectangular plate and the spring plate of the present invention;

in the figure: 1. cutter teeth; 2. a blade body; 3. a cutter head groove; 4. a circular hole; 5. a wire rope; 6. a groove; 7. a push block; 8. a spring; 9. a rectangular plate; 10. a spring plate; 11. a ball bearing; 13. a diamond-shaped fixed block.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the cemented carbide milling cutter according to the present invention comprises a cutter tooth 1, a cutter body 2 and a cutter tooth groove 3; the cutter teeth 1 are arranged in the cutter tooth groove 3; a step hole is formed in the cutter tooth 1; a round hole 4 is formed in the knife body 2; one end of the round hole 4 is positioned on the inner annular surface of the cutter body 2, the other end of the round hole 4 is positioned on the inner wall of the cutter tooth groove 3, the number of the round holes 4 is consistent with that of the cutter tooth grooves 3 and is in one-to-one correspondence with the cutter tooth grooves 3, and a steel wire rope 5 is arranged inside the round hole 4; a groove 6 is formed in the inner annular surface of the knife body 2 and positioned on one side of the round hole 4; a push block 7 is connected inside the groove 6 in a sliding manner; one end of the push block 7 penetrates through the groove 6 and is arc-shaped; a rectangular plate 9 is arranged at the larger end of the stepped hole in the cutter tooth 1; one end of the steel wire rope 5 is fixedly connected with the push block 7, and the other end of the steel wire rope 5 is fixedly connected with the rectangular plate 9;

when the tool tooth 1 is in work, the existing tool tooth 1 and the existing tool body 2 are mounted and dismounted through an external bolt, the tool tooth 1 needs to be fixed by screwing the bolt when mounted, and the tool tooth 1 can be dismounted only by taking out the bolt when the tool tooth 1 is dismounted, so that the mounting and dismounting are complicated and troublesome;

therefore, when the cutter teeth 1 are installed, a worker brings the cutter teeth 1 to be installed close to the cutter tooth grooves 3, the steel wire ropes 5 and the rectangular plates 9 penetrate out of the step holes, the width of the rectangular plates 9 is smaller than the diameter of the smaller end of the step opening, the length of the rectangular plates 9 is smaller than the diameter of the larger step hole of the other end, the rectangular plates 9 can penetrate through the step holes when being horizontally placed, the rectangular plates cannot penetrate through the step holes when being placed in the vertical direction, the worker places the cutter teeth 1 to be installed in the cutter tooth grooves 3, the size of the cutter tooth grooves 3 is matched with the size of the cutter teeth 1, the cutter teeth 1 cannot fall off under the unfixed condition, the rectangular plates 9 are rotated, the rectangular plates 9 are in the vertical direction and attached to the ends, with the larger diameters, of the step holes in the cutter teeth 1, and the four corners of the rectangular plates 9 are just matched with the diameters of the step holes, so that the rectangular plates 9 cannot fall off, when the cutter teeth 1 are all placed in the cutter tooth grooves 3, the cutter body 2 is held by hand, so that the cutter body 2 penetrates through an external milling cutter rod, when the cutter body 2 penetrates through the external milling cutter rod, the milling cutter rod can extrude the push block 7, the push block 7 can move in the groove 6, the steel wire rope 5 is driven to be pulled, the steel wire rope 5 can be gradually brought into the groove 6 along with the movement of the push block 7 as the push block 7 slowly moves into the groove 6, meanwhile, the other end of the steel wire rope 5 can drive the rectangular plate 9 to move and extrude the cutter teeth 1, and the cutter teeth 1 are fixed, so that the cutter teeth 1 are more stable in the cutter tooth grooves 3;

according to the invention, when the push block 7 is pushed by an external milling cutter rod, the push block 7 is pushed to move synchronously, and then the steel wire rope 5 and the rectangular plate 9 are matched with each other; thereby fix sword tooth 1 fast, this kind of fixed mode is swift and simple, has improved the efficiency of installation and dismantlement greatly.

As an embodiment of the invention, the groove bottom of the groove 6 is connected with the other end of the push block 7 through a spring 8; when the milling cutter is in work, when the external milling cutter rod pushes the push block 7 to move, the push block 7 further extrudes the spring 8, so that the steel wire rope 5 becomes a tight state and the rectangular plate 9 is tensioned, and the rectangular plate 9 extrudes the cutter teeth 1, so that the cutter teeth 1 are more stable and cannot fall off; when external milling cutter arbor took out, spring 8 reset, drive ejector pad 7 and reset, and the restoration of ejector pad 7 and then drive wire rope 5 and remove, and at this moment wire rope 5 becomes the state of relaxing by the state of tightening, and the extrusion force between fixed plate and the sword tooth 1 diminishes simultaneously, plays the protection effect, and spring 8 can let ejector pad 7 reset, and ejector pad 7 can not roll off recess 6, can play the effect of preventing falling to ejector pad 7.

As an embodiment of the invention, one end of the stepped hole far away from the cutter body 2 is larger in diameter than the other end; the spring pieces 10 are symmetrically arranged at the larger end of the stepped hole; the opposite ports of the two elastic sheets 10 are fixedly connected with the rectangular plate 9 together; during operation, extrude shell fragment 10 by the staff, make shell fragment 10 take place deformation, and pass the step hole along with the removal of rectangular plate 9, when the step hole is put into to rectangular plate 9, not hard up shell fragment 10, shell fragment 10 resets, make the outer anchor ring of shell fragment 10 contact with the inner wall in step hole, make the area of contact between shell fragment 10 and the step hole increase, because shell fragment 10 with have an elasticity, there is frictional force between shell fragment 10 and the step hole again, thereby can make the stable subsides of shell fragment 10 on the step hole inner wall, shell fragment 10 is connected with rectangular plate 9 again, the stable shape of rectangular plate 9 has been increased, make rectangular plate 9 more stable when extrudeing knife teeth 1.

As an embodiment of the invention, one edge of the elastic sheet 10, which is far away from the step hole inside the cutter tooth 1, extends to the outer side of the cutter tooth 1; during operation, shell fragment 10 is because of extending to the outside of sword tooth 1, and the staff of being convenient for more kneads shell fragment 10, and the taking out and placing of shell fragment 10 of being convenient for.

As an embodiment of the invention, a ball 11 is connected between the groove 6 and the circular hole 4 in a rolling manner, and the ball 11 is located on the inner annular surface of the blade body 2; the ball 11 is simultaneously contacted with the steel wire rope 5 and the push block 7; during operation, through the roll connection of ball 11, can protect wire rope 5 for wire rope 5 does not contact with the corner between round hole 4 and the recess 6 at the in-process that removes, with the reduction friction, increases wire rope 5 life.

As an embodiment of the invention, a diamond-shaped fixed block 13 is arranged at the position of the knife body 2 close to the knife teeth 1; the rhombic fixed block 13 is rotationally connected with the cutter body 2 through a rotating rod, and the long end of the rhombic fixed block 13 can be attached to the outer surface of the cutter tooth 1 after being rotated; the during operation, through rotating rhombus fixed block 13, rhombus fixed block 13 turned angle is only 90 degrees, when rhombus fixed block 13 rotates and is the vertical state, is used for extrudeing sword tooth 1 for sword tooth 1 is more stable with sword tooth groove 3 matched with, and when rhombus fixed block 13 rotated the level, does not contact with sword tooth 1, makes sword tooth 1 not influenced when taking out.

The specific working process is as follows:

a worker brings the cutter teeth 1 to be installed close to the cutter tooth groove 3, a steel wire rope 5 and a rectangular plate 9 penetrate out of the step hole, the width of the rectangular plate 9 is smaller than the diameter of the smaller end of the step opening, the length of the rectangular plate 9 is smaller than the diameter of the larger step hole of the other end, the rectangular plate 9 can penetrate through the step hole when being horizontally placed, the step hole cannot be penetrated in the vertical direction, the worker places the cutter teeth 1 to be installed in the cutter tooth groove 3, the size of the cutter tooth groove 3 is matched with that of the cutter teeth 1, the cutter teeth 1 cannot fall off under the condition of unfixed condition, the rectangular plate 9 is rotated to enable the rectangular plate 9 to be in the vertical direction and be attached to the end, with the larger diameter, of the step hole in the cutter teeth 1, the rectangular plate 9 cannot fall off due to the fact that the four corners of the rectangular plate 9 are just matched with the diameter of the step hole, the cutter teeth 1 are placed in the cutter tooth groove 3, the cutter body 2 is held by hand, so that the cutter body 2 penetrates through an external cutter milling rod, when the cutter body 2 penetrates through the external cutter milling rod, the cutter milling rod extrudes the push block 7, the push block 7 moves in the groove 6, the steel wire rope 5 is driven to be pulled, the steel wire rope 5 is gradually moved into the groove 6 along with the movement of the push block 7, meanwhile, the rectangular plate 9 is driven by the other end of the steel wire rope 5 to move, the cutter tooth 1 is extruded, and the cutter tooth 1 is fixed, so that the cutter tooth 1 is more stable in the cutter tooth groove 3; when the external milling cutter bar pushes the push block 7 to move, the push block 7 further extrudes the spring 8, so that the steel wire rope 5 becomes a tight state and the rectangular plate 9 is tensioned, and the rectangular plate 9 extrudes the cutter teeth 1, so that the cutter teeth 1 are more stable and cannot fall off; when the external milling cutter rod is taken out, the spring 8 resets to drive the push block 7 to reset, the push block 7 resets to drive the steel wire rope 5 to move, the steel wire rope 5 is changed from a tightened state to a loosened state, meanwhile, the extrusion force between the fixed plate and the cutter teeth 1 is reduced, a protection effect is achieved, the spring 8 can enable the push block 7 to reset, the push block 7 cannot slide out of the groove 6, and an anti-falling effect can be achieved on the push block 7; the elastic sheet 10 is squeezed by a worker, so that the elastic sheet 10 deforms and penetrates through the step hole along with the movement of the rectangular plate 9, when the rectangular plate 9 is placed into the step hole, the elastic sheet 10 is loosened, the elastic sheet 10 is reset, the outer ring surface of the elastic sheet 10 is in contact with the inner wall of the step hole, the contact area between the elastic sheet 10 and the step hole is increased, friction force exists between the elastic sheet 10 and the step hole due to the elastic sheet 10 and elasticity, the elastic sheet 10 can be stably attached to the inner wall of the step hole, the elastic sheet 10 is connected with the rectangular plate 9, the stability of the rectangular plate 9 is increased, and the cutter tooth 1 is more stable when the rectangular plate 9 squeezes the cutter tooth 1; the elastic sheet 10 extends to the outer side of the cutter teeth 1, so that a worker can knead the elastic sheet 10 more conveniently, and the elastic sheet 10 can be taken out and placed conveniently; the steel wire rope 5 can be protected through the rolling connection of the balls 11, so that the steel wire rope 5 is not in contact with the corner between the round hole 4 and the groove 6 in the moving process, the friction is reduced, and the service life of the steel wire rope 5 is prolonged; through rotating rhombus fixed block 13, rhombus fixed block 13 turned angle is only 90 degrees, when rhombus fixed block 13 rotates and is the vertical state, is used for extrudeing sword tooth 1 for sword tooth 1 and sword tooth groove 3 matched with are more stable, and when rhombus fixed block 13 rotated the level, do not contact with sword tooth 1, make sword tooth 1 not influenced when taking out.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.