Bolt hole chamfering device for track link section

Abstract

The invention relates to the technical field of chamfering machining, in particular to a bolt hole chamfering machining device for a track link section, which comprises a workbench, a rack, an output motor, a rotating shaft, a driving part, a mounting frame, an adjusting mechanism, an expanding mechanism and a grinding head, the rack is mounted on the workbench, the output motor is mounted in the rack, and the rotating shaft is mounted in the rack; the rotating shaft is mounted at the output end of the output motor, the driving part is mounted on the rack, the mounting frame is mounted in the rack, the adjusting mechanism is mounted on the rotating shaft, the expanding mechanism is mounted in the rotating shaft, the polishing head is mounted at the other end of the rotating shaft, and the slope-adjustable polishing head is arranged to meet different chamfering requirements. And meanwhile, the stability in the chamfering process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of chamfering processing, and specifically relates to a chamfering processing device for bolt holes of track links. Background Art

[0002] A chamfering processing device for bolt holes of track links is a mechanical device or tooling specifically designed for chamfering the bolt holes on track links. The device aims to improve the processing efficiency and accuracy of the bolt holes of track links, ensure that bolts can be firmly installed on track links, thereby improving the stability and durability of the entire chain or track system.

[0003] During the chamfering process of the bolt holes of large track links, due to the different positions of the bolts on the track links, their functions are naturally different, which in turn leads to different sizes of multiple bolt holes on the same track link. Some bolt holes are large, and some are small. When the aperture of the bolt hole is large, setting a circumferential blade of the same size to chamfer it integrally poses technological difficulties, and due to the difficulty of calibrating the midpoint in one go, chamfering will occur when there is a deviation. At the same time, when chamfering different bolt holes, the adaptability of the chamfer to the bolt hole needs to be considered, so that when connecting bolts suitable for the size of the bolt hole, they can be better loaded. Increasing the chamfer angle can reduce the stress peak value. Therefore, the larger the aperture, the larger the chamfer required. However, if it is too large, it will weaken the bearing area of the hole wall. Therefore, a suitable chamfer needs to be selected to improve the convenient installation of bolts.

[0004] In the prior art, the method of chamfering the same bolt hole in a single batch is usually used. After chamfering the bolt holes of the same batch, if the chamfer size needs to be changed, at this time, the blade or grinding head for chamfering needs to be replaced. Therefore, blades or grinding heads suitable for the size need to be prepared. At the same time, when the chamfer is too large, ordinary blades or grinding heads are difficult to chamfer like conventional stamping, resulting in uneven chamfer quality, thus affecting the chamfer quality of the bolt holes of track links.

[0005] Based on this, in order to solve the problem that when chamfering bolt holes of different sizes on track links, it is difficult to conveniently adjust the chamfer of the bolt holes to meet the requirements of the bolt hole size, the present invention designs a chamfering processing device for bolt holes of track links. Summary of the Invention

[0006] The chamfering processing device for bolt holes of track links provided by the present invention solves the problem that when chamfering bolt holes of different sizes on track links, it is difficult to conveniently adjust the chamfer of the bolt holes to meet the requirements of the bolt hole size. By setting a grinding head with adjustable slope to adapt to the requirements of different chamfers, the stability during the chamfering process is improved at the same time.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A chamfering processing device for a track link bolt hole provided by the present invention includes a workbench, a frame, an output motor, a rotating shaft, a driving member, a mounting frame, an adjusting mechanism, an expanding mechanism, and a grinding head. The frame is mounted on the workbench, the output motor is mounted inside the frame, the rotating shaft is mounted at the output end of the output motor, the driving member is mounted on the frame, the mounting frame is mounted inside the frame, the adjusting mechanism is mounted on the rotating shaft, the expanding mechanism is mounted inside the rotating shaft, the grinding head is mounted at the other end of the rotating shaft. The driving member drives the adjusting mechanism to change the grinding head inclination angle, and the driving member drives the expanding mechanism to lock the position of the grinding head after adjustment. By adopting the method of sequential grinding of the side seams, after chamfering the bolt hole at the initial point, the chamfering of the entire bolt hole can be realized, thereby improving the yield and efficiency of the bolt hole chamfering.

[0009] Preferably, the rotating shaft is hollow and is divided into a fixed part and a movable part, so as to realize the adjustment of the longitudinal position.

[0010] Preferably, the driving member includes a hydraulic cylinder, a rack, a gear, and a handle. The hydraulic cylinder is mounted above the movable part, the rack is mounted on the side wall of the fixed part, the gear is mounted inside the frame through a shaft, and the handle is mounted on the shaft where the gear is located; further, in cooperation with the rotating shaft, the position of the grinding head can be longitudinally adjusted.

[0011] Preferably, the grinding head is an inner concave surface, an installation ring is installed at the center of the grinding head, compression springs are annularly arranged at the output end of the rotating shaft, and a clamping block is installed at the other end of the compression spring, which can adapt to the rounded corner and improve the convenience of installation and disassembly.

[0012] Preferably, the grinding head is composed of several grinding sheets. The grinding sheets are divided into a connecting part and a bending part. The connecting part and the bending part are rotatably connected. The connecting part is connected to the movable part of the rotating shaft. When processing different bolt holes, for different bolt hole diameters and thread depths, the slope of the chamfer is adjusted, thereby improving the adaptability of the bolt hole.

[0013] Preferably, the adjusting mechanism includes an installation ring, a connecting rod, a sliding groove, and a sliding block. The installation ring is installed at the output end of the hydraulic cylinder, one end of the connecting rod is installed below the installation ring, the sliding groove is opened on the back of the bending part, the sliding block is installed at the other end of the connecting rod, and the sliding block slides in the sliding groove, concentrating the stress at the grinding sheet. When grinding, the non-contact grinding sheets can offset the stress brought by the chamfer of the contact grinding sheets, thereby improving the stability during the chamfering process.

[0014] Preferably, the expansion mechanism includes an installation groove, a through hole, a limiting block, and a return spring. The installation groove is formed inside the slider, the through hole is formed in the side wall of the slider, the limiting block is installed at the through hole, and the return spring is installed between the limiting block and the inner wall of the slider. The bending part of a single grinding sheet can be disassembled, and at this time, the way of disassembling a single fixing part can be selected to replace the grinding sheet, thereby improving the use efficiency of the grinding head.

[0015] Preferably, an inverted stepped convex block is formed on the inner wall of the sliding groove, and the convex block is engaged with the limiting block. Under the action of the inverted stepped convex block, the two form a limit, and thus can cooperate with the hydraulic drive to improve the strength of the grinding head.

[0016] Preferably, a limiting groove is formed inside the convex block, and a ball is slidably installed in the limiting groove. The ball can further prevent the convex block from deflecting in position, thereby improving the stability during the chamfering process.

[0017] Preferably, holes are formed on the surface of the grinding sheet, and the holes are arranged perpendicular to the surface of the grinding sheet, thereby achieving a thermal equilibrium state and forming a directional air flow at the same time.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. A bolt hole chamfering processing device for a track link proposed by the present invention changes the shape of the grinding head through multiple grinding sheets. When chamfering a straight chamfer, different chamfers can be formed by adjusting the angles of the grinding sheets. At the same time, even when a single grinding sheet is damaged, the remaining grinding sheets can still normally chamfer the bolt hole. Through the adjustable grinding sheets, when processing different bolt holes, the chamfer slope can be adjusted according to different bolt hole diameters and thread depths, thereby improving the adaptability of the bolt holes.

[0020] 2. A bolt hole chamfering processing device for a track link proposed by the present invention has a slider sliding in a sliding groove. When the hydraulic cylinder drives the connecting rod to move, the connecting rod will drive the slider to slide in the sliding groove at this time. The slider and the connecting rod are hinged. However, since the position of the hydraulic cylinder driving the connecting rod is controlled by the hydraulic cylinder, when the hydraulic cylinder stops working, the position of the connecting rod can be restricted, and thus the position of the slider is fixed. Multiple bending parts form an umbrella shape, and thus the stress is concentrated at the grinding sheet. When grinding, the non-contact grinding sheets can offset the stress brought by the chamfering of the contact grinding sheets, thereby improving the stability during the chamfering process.

[0021] 3. A chamfering device for bolt holes of track links proposed by the present invention, through the cooperation of a convex block and a slider, when the hydraulic cylinder pushes downward, it can drive the slider to gradually move along the bending part towards the hinge point of the bending part and the fixed part. At this time, the inclination direction of the convex block is consistent with the moving direction, so there will be no obstruction. However, after the adjustment is completed, during the chamfering process, the grinding sheet will push the bending part under extrusion, and then the bending part will tend to flip upward, causing the convex block to move upward relative to the slider. At this time, under the action of the stepped convex block, the two form a limit, which can cooperate with the hydraulic drive to improve the strength of the grinding head, and further improve the stability of chamfering different bolt holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are one embodiment of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a working schematic diagram when the present invention performs fillet chamfering;

[0025] Figure 3 is a schematic diagram of the driving member of the present invention;

[0026] Figure 4 is a schematic diagram of the internal structure of the driving member of the present invention;

[0027] Figure 5 is Figure 4 a half-sectional schematic diagram of;

[0028] Figure 6 is a schematic diagram of the structure at the grinding sheet of the present invention;

[0029] Figure 7 is a half-sectional schematic diagram at the grinding head;

[0030] Figure 8 is Figure 7 an enlarged view of part A in;

[0031] Figure 9 is a schematic diagram of the internal structure of the slider of the present invention.

[0032] In the figure: 1, workbench; 2, frame; 3, output motor; 4, rotating shaft; 41, fixed part; 42, movable part; 43, compression spring; 44, clamping block; 5, driving member; 51, hydraulic cylinder; 52, rack; 53, gear; 54, handle; 6, mounting bracket; 7, adjusting mechanism; 71, mounting ring; 72, connecting rod; 73, chute; 731, convex block; 732, limiting groove; 733, ball; 74, slider; 8, expanding mechanism; 81, mounting groove; 82, through hole; 83, limiting block; 84, reset spring; 9, grinding head; 91, connecting ring; 92, grinding disc; 921, connecting part; 922, bending part; 923, hole. Detailed implementation mode

[0033] In order to better understand the above solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and the specific implementation mode.

[0034] As Figure 1-7 shown, a chamfering processing device for bolt holes of track links provided by the present invention includes a workbench 1, a frame 2, an output motor 3, a rotating shaft 4, a driving member 5, a mounting bracket 6, an adjusting mechanism 7, an expanding mechanism 8, and a grinding head 9. The frame 2 is installed on the workbench 1, the output motor 3 is installed inside the frame 2, the rotating shaft 4 is installed at the output end of the output motor 3, the driving member 5 is installed on the frame 2, the mounting bracket 6 is installed inside the frame 2, the adjusting mechanism 7 is installed on the rotating shaft 4, the expanding mechanism 8 is installed inside the rotating shaft 4, the grinding head 9 is installed at the other end of the rotating shaft 4, the driving member 5 drives the adjusting mechanism 7 to change the grinding head inclination angle of the grinding head 9, and the driving member 5 drives the expanding mechanism 8 to lock the position of the grinding head 9 after adjustment.

[0035] In the prior art, by starting the output motor 3 to drive the belt and pulley to rotate, the rotating shaft 4 is driven to rotate through the power transmission of the pulley. At this time, the driving member 5 can be a rack 52, a gear 53 and a handle 54. The gear 53 is driven to rotate by the handle 54. At this time, the gear 53 drives the rack 52 to move up and down, and then drives the whole rotating shaft 4 to move down, so as to realize drilling or chamfering of an object by the grinding head 9. A turntable is arranged below the workpiece, and the turntable drives the workpiece to rotate, so as to realize 360° rotation of the chamfering position of the workpiece;

[0036] Above the workbench 1, a processing table rotated by a built-in motor is installed. The workpiece is placed on the processing table. Under the action of the built-in motor, the processing table is driven to rotate. At this time, the rotation speed of the built-in motor can be adjusted to rotate slowly, while the output motor 3 above needs to rotate at a faster speed. In contrast, the high-speed rotation of the output motor 3 drives the grinding head 9 to rotate rapidly, thus forming a rapid rotation of the grinding head 9, and further enabling the grinding head 9 to cut the workpiece when it contacts the workpiece; the main function of the built-in motor is to adjust the position of the workpiece, so that the chamfer of the workpiece grinding can be cycled. Based on the situation that the bolt hole diameter of the workpiece is relatively large, at this time, the chamfer circumference of the workpiece to be ground is relatively long. Using the conventional chamfering method, it is difficult to position the appropriate grinding head 9, and it is difficult to just locate the center during chamfering, which may cause problems such as damage to the bolt hole chamfer. By adopting the method of sequential grinding of the side seams, after the bolt hole chamfer is completed at the initial point, the chamfer of the entire bolt hole can be realized, thereby improving the yield and efficiency of the bolt hole chamfer.

[0037] As Figure 5 shown, the rotating shaft 4 is hollow, and the rotating shaft 4 is divided into a fixed part 41 and a movable part 42. The fixed part 41 is located outside the movable part 42, and the fixed part 41 is hollow, and the two are slidably connected;

[0038] The rotating shaft 4 can drive the grinding head 9 to rotate. By setting the fixed part 41 and the movable part 42, the fixed part 41 is at the output end of the output motor 3 (in the figure, it is the output end of the pulley, and it is also possible not to set the belt and pulley and directly install the output motor 3 above the grinding head 9), and the movable part 42 can move up and down along the fixed part 41 under the action of the driving part 5, and the fixed part 41 and the movable part 42 are also connected by splines.

[0039] As Figure 3 shown, the driving part 5 includes a hydraulic cylinder 51, a rack 52, a gear 53, and a handle 54. The hydraulic cylinder 51 is installed above the movable part 42, the rack 52 is installed on the side wall of the movable part 42, the gear 53 is installed in the frame 2 through a shaft, and the handle 54 is installed on the shaft where the gear 53 is located. The hydraulic cylinder 51 is located on the mounting frame 6 and is located on the movable part 42. Therefore, the position of the hydraulic cylinder 51 can move up and down synchronously with the movable part 42. The rack 52 is installed on the side wall of the movable part 42. Therefore, when the handle 54 drives the gear 53 to rotate, the gear 53 can drive the rack 52 to move up and down, thereby realizing the approach of the grinding head 9 to the workpiece, and further forming chamfering processing.

[0040] As Figure 2 、 6, as shown in Figures 7 and 8, the grinding head 9 has a concave surface, a connecting ring 91 is installed at the center of the grinding head 9, the output end of the rotating shaft 4 is annularly and arrayedly installed with compression springs 43, and the other end of the compression spring 43 is installed with a clamping block 44.

[0041] When grinding an arc chamfer is required, at this time the grinding head 9 has a concave surface. When the grinding head 9 contacts the bolt hole, the concave surface of the grinding head 9 gradually contacts the top of the inner edge of the bolt hole, thus forming an arc surface. As the built-in motor drives the rotation of the workbench 1, at this time the workpiece gradually rotates around the center where the bolt hole is located, and then the grinding head 9 gradually contacts the bolt hole, thereby chamfering the bolt hole; at the same time, the connecting ring 91 can be clamped at the bottom end of the rotating shaft 4, and through the limit of the compression spring 43 and the clamping block 44, the grinding head 9 is fixed. During the process of grinding the chamfer, initially it is a cutting stress from top to bottom. At this time, the connection between the connecting ring 91 and the clamping block 44 is laterally extruded and then falls off. By this method, the fixing of the grinding head 9 can be realized. Thus, during the grinding process, whether it is the initial longitudinal extrusion or after reaching the unified horizontal plane of the chamfer, the built-in motor drives the workpiece to rotate around the center line of the bolt hole, thereby realizing the chamfering of the bolt hole.

[0042] As Figure 6 , 7 shown, the grinding head 9 is composed of several grinding sheets 92. The grinding sheets 92 are divided into a connecting part 921 and a bending part 922. The connecting part 921 and the bending part 922 are rotatably connected, and the connecting part 921 is connected to the connecting ring 91.

[0043] At this time, the grinding head 9 is of a spliced type. By changing the shape of the grinding head 9 with multiple grinding sheets 92, when grinding a straight chamfer, by adjusting the angle of the grinding sheets 92, different chamfers can be formed. At the same time, even when a single grinding sheet 92 is damaged, the remaining grinding sheets 92 can still normally chamfer the bolt hole. At the same time, with the adjustable grinding sheets 92, when processing different bolt holes, for different bolt hole diameters and thread depths, the slope of the chamfer can be adjusted, thereby improving the adaptability of the bolt hole.

[0044] The connecting part 921 is connected to the connecting ring 91, thereby making the connecting part 921 relatively fixed. The fixing of the bending part 922 is controlled by hydraulic pressure, thus ensuring that the bending part 922 will not bend during chamfering, thereby improving the strength of the grinding head 9 during chamfering. Since the material of the chain track is relatively hard, it is necessary to control the grinding head 9 not to deform during grinding. During the grinding process, in addition to the support of the rotating shaft 4 for the grinding sheet 92, there is also the support of the hydraulic cylinder 51 for the grinding sheet 92 through the adjusting mechanism 7. Thus, during chamfering, multi-point support can be achieved, thereby improving the strength of chamfering and the stability of the grinding head 9. In addition, during the chamfering process, the chips generated by chamfering will remain at the grinding head 9. If it is a conventional closed grinding head 9, at this time, if the chips remain on the surface of the grinding head 9, it will damage the edge of the bolt hole and the surface of the grinding head 9, thereby reducing the grinding quality.

[0045] As Figure 4 、 5 As shown in FIGS. 6, the adjusting mechanism 7 includes a mounting ring 71, a connecting rod 72, a sliding groove 73, and a sliding block 74. The mounting ring 71 is mounted on the output end of the hydraulic cylinder 51. One end of the connecting rod 72 is mounted below the mounting ring 71. The sliding groove 73 is formed on the back surface of the bending part 922. The sliding block 74 is mounted at the other end of the connecting rod 72, and the sliding block 74 is slidably mounted in the sliding groove 73.

[0046] The mounting ring 71 is used to simultaneously drive multiple connecting rods 72 to move synchronously when the hydraulic cylinder 51 is driven, thereby driving multiple grinding sheets 92 to move simultaneously, so as to achieve chamfering of the bolt holes of the workpiece. The sliding block 74 slides in the sliding groove 73. When the hydraulic cylinder 51 drives the connecting rod 72 to move, at this time, the connecting rod 72 will drive the sliding block 74 to slide in the sliding groove 73. The sliding block 74 and the connecting rod 72 are hinged. However, since the position where the hydraulic cylinder 51 drives the connecting rod 72 is controlled by the hydraulic cylinder 51, when the hydraulic cylinder 51 stops working, the position of the connecting rod 72 can be restricted, thereby making the position of the sliding block 74 fixed. Multiple bending parts 922 form an umbrella shape, thereby concentrating the stress at the grinding sheet 92. During grinding, the non-contact grinding sheets 92 can offset the stress brought by the chamfering of the contact grinding sheets 92, thereby improving the stability during the chamfering process.

[0047] As Figure 9 shown, the expansion mechanism 8 includes a mounting groove 81, a through hole 82, a limiting block 83, and a return spring 84. The mounting groove 81 is formed inside the sliding block 74. The through hole 82 is formed on the side wall of the sliding block 74. The limiting block 83 is mounted at the through hole 82, and the return spring 84 is mounted between the limiting block 83 and the inner wall of the sliding block 74.

[0048] During the movement of the slider 74, the limiting block 83 slides within the through hole 82. When it comes into contact with the inner wall of the sliding groove 73, the limiting block 83 restricts the extreme position of the slider 74 at this time, thereby preventing them from separating from each other during the chamfering process. When replacement is needed, only the limiting block 83 needs to be pressed against the return spring 84, and then the bent portion 922 of a single grinding sheet 92 can be disassembled. At this time, the grinding sheet 92 can be replaced by choosing to disassemble a single fixing portion 41, thereby improving the usage efficiency of the grinding head 9.

[0049] As Figure 8 shown, a reverse stepped convex block 731 is provided on the inner wall of the sliding groove 73, and the convex block 731 is engaged with the limiting block 83.

[0050] Through the cooperation of the convex block 731 and the slider 74, when the hydraulic cylinder 51 pushes downward, it can drive the slider 74 to gradually move along the bent portion 922 towards the hinge point of the bent portion 922 and the fixing portion 41. At this time, the inclination direction of the convex block 731 is consistent with the reverse direction of this movement, and thus no obstruction will be formed. However, after the adjustment is completed, during the chamfering process, the grinding sheet 92 will be pushed by the extrusion force, and then the bent portion 922 will tend to flip upward, which will cause the convex block 731 to move upward relative to the slider 74. At this time, under the action of the reverse stepped convex block 731, the two form a limit, thereby being able to cooperate with the hydraulic drive to improve the strength of the grinding head 9.

[0051] As Figure 9 shown, a limiting groove 732 is provided inside the convex block 731, and a ball 733 is slidably installed in the limiting groove 732.

[0052] During the rotation process, under the action of centrifugal force, the ball 733 will slide out of the limiting groove 732 and then come into contact with the surface of the sliding groove 73. Restricted by the convex block 731, the ball 733 can further prevent the convex block 731 from deflecting in position, thereby improving the stability during the chamfering process. The ball 733 is connected to the bottom of the limiting groove 732 through a tension spring.

[0053] Holes 923 are provided on the surface of the grinding sheet 92, and the holes 923 are arranged perpendicular to the surface of the grinding sheet 92.

[0054] On the one hand, the holes 923 enhance gas circulation, achieve heat dissipation in the chamfering area, and thus achieve a thermal equilibrium state; on the other hand, a negative pressure area can be formed through the holes 923, thereby generating a directional airflow field, and thus achieving the directional flow of chips.

[0055] When chamfering the bolt holes on the track link, the worker selects a suitable grinding head 9 at this time, installs and fixes the track link on the workbench 1, and places the center of the bolt hole to be chamfered on the axis of the built-in motor at the bottom of the workbench 1. At this time, start the output motor 3 to drive the grinding head 9 to rotate. Then, the worker rotates the hand-held handle 54 to drive the gear 53 to rotate. The gear 53 drives the rack 52 to move downward, and further drives the grinding head 9 to approach the edge of the track link bolt hole for chamfering;

[0056] When chamfering different bolt holes, stop the output motor 3 at this time and start the hydraulic cylinder 51. The hydraulic cylinder 51 drives the mounting ring 71 to move downward. The mounting ring 71 drives a plurality of connecting rods 72 to move downward. There are six in the figure. Subsequently, it will drive the slider 74 to move towards the center along the chute 73, thereby gradually reducing the slope of the grinding disc 92, so as to realize the adjustment of the angle of the grinding head 9. At this time, the limiting block 83 on the slider 74 will contact the convex block 731, and the convex block 731 limits the limiting block 83, and further cooperates with the hydraulic drive to initially lock the slider 74; start the output motor 3. At this time, the grinding head 9 rotates, and the ball 733 in the slider 74 will slide out to further realize the limit and improve the stability of the grinding head 9 during the chamfering process.

[0057] The above shows and describes the basic principles and beneficial effects of the present invention. At the same time, the present invention is not limited by the above embodiments. Without departing from the effects and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A device for chamfering bolt holes for track links, characterized in that: The invention comprises a workbench (1), a frame (2), an output motor (3), a rotating shaft (4), a driving member (5), a mounting frame (6), an adjusting mechanism (7), an expanding mechanism (8), and a grinding head (9), wherein the frame (2) is mounted on the workbench (1), the output motor (3) is mounted inside the frame (2), the rotating shaft (4) is mounted at the output end of the output motor (3), the driving member (5) is mounted on the frame (2), the mounting frame (6) is mounted inside the frame (2), the adjusting mechanism (7) is mounted on the rotating shaft (4), the expanding mechanism (8) is mounted inside the rotating shaft (4), the grinding head (9) is mounted at the other end of the rotating shaft (4), the driving member (5) drives the adjusting mechanism (7) to change the grinding head inclination angle of the grinding head (9), and the driving member (5) drives the expanding mechanism (8) to lock the adjusted position of the grinding head (9).

2. A device for chamfering bolt holes for track links according to claim 1, characterized in that: The rotating shaft (4) is hollow and is divided into a fixed part (41) and a movable part (42).

3. A device for chamfering bolt holes for track links according to claim 2, characterized in that: The driving member (5) comprises a hydraulic cylinder (51), a rack (52), a gear (53), and a handle (54); the hydraulic cylinder (51) is mounted above the movable part (42); the rack (52) is mounted on the side wall of the fixed part (41); the gear (53) is mounted in the frame (2) via a shaft; and the handle (54) is mounted on the shaft where the gear (53) is located.

4. A device for chamfering bolt holes for track links according to claim 2, characterized in that: The grinding head (9) is an inner concave surface, a connecting ring (91) is installed at the center of the grinding head (9), a compression spring (43) is installed in a circular array at the output end of the rotating shaft (4), and a clamping block (44) is installed at the other end of the compression spring (43).

5. The device for chamfering bolt holes for track links according to claim 1, characterized in that: The grinding head (9) is composed of six grinding sheets (92), and the grinding sheets (92) are divided into a connecting portion (921) and a bending portion (922). The connecting portion (921) is rotatably connected to the bending portion (922), and the connecting portion (921) is connected to the connecting ring (91).

6. A device for chamfering bolt holes for track links according to claim 5, characterized in that: The adjusting mechanism (7) comprises a mounting ring (71), a connecting rod (72), a slide groove (73), and a slider (74); the mounting ring (71) is mounted on the output end of the hydraulic cylinder (51); one end of the connecting rod (72) is mounted below the mounting ring (71); the slide groove (73) is provided on the back side of the bending portion (922); the slider (74) is mounted on the other end of the connecting rod (72); and the slider (74) is mounted in the slide groove (73) to slide.

7. A device for chamfering bolt holes for track links according to claim 6, characterized in that: The expansion mechanism (8) comprises a mounting groove (81), a through hole (82), a limit block (83), and a return spring (84); the mounting groove (81) is provided inside the slider (74); the through hole (82) is provided on the side wall of the slider (74); the limit block (83) is installed at the through hole (82); and the return spring (84) is installed between the limit block (83) and the inner wall of the slider (74).

8. A device for chamfering bolt holes for track links according to claim 7, characterized in that: An inverted stepped protrusion (731) is provided on the inner wall of the slide groove (73), and the protrusion (731) is engaged with the limiting block (83).

9. A device for chamfering bolt holes for track links according to claim 8, characterized in that: A limiting groove (732) is provided on the inner side of the protrusion (731), and a pin (733) is slidably installed in the limiting groove (732).

10. The device for chamfering bolt holes for track links according to claim 5, characterized in that: The surface of the grinding sheet (92) is provided with holes (923), and the holes (923) are arranged perpendicular to the surface of the grinding sheet (92).

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