A grinding head assembly

Abstract

The application discloses a grinding wheel grinding head assembly, which comprises a box body, a main shaft and a grinding wheel arranged at one end of the main shaft, an installation cavity is arranged in the box body, a compensation mechanism is arranged in the installation cavity, the compensation mechanism comprises a lifting frame which can move vertically along the inner wall of the installation cavity, the main shaft is horizontally arranged in the installation cavity and penetrates through the lifting frame at both ends, a first oil cylinder body is arranged on the upper end surface of the lifting frame, a ratchet wheel is arranged in the first oil cylinder body, a piston rod is arranged on one side of the ratchet wheel, a ratchet wheel shifting rod is arranged on the piston rod, a driving gear is arranged on the rotating shaft of the ratchet wheel, a screw rod is arranged on one side of the driving gear, a driven gear which is engaged with the driving gear is arranged on the screw rod, and the lower end of the screw rod extends to the inside of the lifting frame and is connected with the lifting frame. The grinding wheel can feed along the direction of a workpiece, the feeding amount can be accurately fed, the grinding wheel can be automatically dressed, the compensation of the grinding wheel and the linkage operation of the pressure angle and the top dressing of the grinding wheel can be realized.

Description

Technical Field

[0001] This invention belongs to the field of grinding head technology, and particularly relates to a grinding wheel head assembly. Background Technology

[0002] Currently, spur bevel gears can be machined using equipment such as gear planers and gear milling machines. Compared to planing and milling, gear grinding offers higher precision and better meets the needs of current working conditions. Common spur gear grinding machines use disc-shaped grinding wheels as abrasives. However, the wear of the grinding wheel is significant, and without timely compensation, the ground tool head will not meet design requirements, necessitating multiple grinding cycles and impacting processing efficiency. Gear grinding machines use a form grinding method for tooth profile machining, dressing the grinding wheel to match the workpiece contour. Therefore, the contour shape accuracy of the grinding wheel determines the magnitude of the tooth profile error. Grinding wheels require dressing during use to ensure that the grinding wheel tip and pressure angle are corrected, minimizing tooth profile errors. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a grinding wheel assembly that enables the grinding wheel to be fed along the workpiece direction, achieves compensation operation, ensures accurate and uniform feed amount, and achieves precise feed; it can also realize automatic dressing of the grinding wheel, grinding wheel compensation, and coordinated operation of grinding wheel pressure angle and tip dressing.

[0004] The present invention is implemented as follows: a grinding wheel head assembly includes a housing, a spindle penetrating the housing, and a grinding wheel disposed at one end of the spindle. The housing is provided with a mounting cavity, and the mounting cavity is provided with a compensation mechanism that can drive the spindle and the grinding wheel to feed along the workpiece direction. The compensation mechanism includes a lifting frame that can move vertically along the inner wall of the mounting cavity. The spindle is horizontally disposed in the mounting cavity and its two ends penetrate the lifting frame.

[0005] The upper surface of the lifting frame is provided with a first hydraulic cylinder body. A ratchet is provided in the first hydraulic cylinder body through a rotating shaft. A piston rod is provided in the first hydraulic cylinder body located on one side of the ratchet. A ratchet lever for actuating the ratchet is provided on the piston rod. A drive gear that rotates synchronously with the ratchet is provided on the rotating shaft where the ratchet is located. A screw is provided on one side of the drive gear. A driven gear that meshes with the drive gear is provided on the screw. The lower end of the screw extends through the first hydraulic cylinder body into the lifting frame and is provided with a nut. The nut is connected to the lifting frame.

[0006] Furthermore, a pressure angle trimming mechanism is provided on one side of the housing. The pressure angle trimming mechanism includes a pressure angle trimming arm provided on one side of the working end face of the grinding wheel and a first mounting frame provided on one side of the housing. A second cylinder body is provided inside the first mounting frame, and a piston rack is provided inside the second cylinder body. A first gear that meshes with the piston rack is provided at the lower end of the second cylinder body. A first mounting shaft is provided on one side of the first gear, and a first sector gear and a second gear are provided on the first mounting shaft. The first sector gear meshes with the first gear. A first rack that meshes with the second gear is provided inside the first mounting frame. A pressure angle trimming cutter is provided near the end of the grinding wheel of the pressure angle trimming arm, and the end of the pressure angle trimming arm away from the grinding wheel is connected to the upper end of the first rack.

[0007] Furthermore, the first rack is set at a 20° angle relative to the plane of the grinding wheel.

[0008] Furthermore, electrodes for feeding back signals to the hydraulic station are respectively provided on the second cylinder bodies at both ends of the piston rack.

[0009] Furthermore, a top dressing mechanism is provided on the other side of the housing of the relative pressure angle dressing mechanism. The top dressing mechanism includes a top dressing arm provided on one side of the working end face of the grinding wheel and a second mounting frame provided on one side of the housing. A second mounting shaft is provided in the second mounting frame, and a third gear, a fourth gear and a lifting cam are sequentially provided on the second mounting shaft.

[0010] A second sector gear is provided on the first mounting shaft, a transmission shaft is horizontally provided at the lower end of the housing, a fifth gear is provided on the transmission shaft corresponding to the pressure angle trimming mechanism side, the second sector gear meshes with the fifth gear, and a sixth gear is provided on the transmission shaft corresponding to the top trimming mechanism side, the third gear meshes with the sixth gear.

[0011] A hollow cylindrical swing body is provided on one side of the second mounting shaft. The lower end of the swing body is provided with a mating groove that engages with the lifting cam. A rack shaft is vertically arranged inside the swing body. A second rack that meshes with the fourth gear is provided at the lower end of the rack shaft. A third rack is provided at the upper end of the rack shaft. A rotating shaft is horizontally arranged at the upper end of the swing body. A helical gear that meshes with the third rack is provided on the rotating shaft. A top dressing tool is provided near the grinding wheel end of the top dressing arm. The end of the top dressing arm away from the grinding wheel is connected to the rotating shaft.

[0012] Furthermore, a trajectory cam is provided at the other end of the rotating shaft relative to the top trimming arm connection end, and a limit screw is provided on the upper surface of the second mounting frame through a mounting bracket, the limit screw cooperating with the trajectory cam.

[0013] Furthermore, a tension spring is provided between the outer wall of the upper end of the swing body and the box body.

[0014] Furthermore, a reset adjustment hole is provided on the upper end face of the screw.

[0015] Furthermore, the lifting frame is mounted on the inner wall of the mounting cavity via a needle roller array.

[0016] The advantages and technical effects of this invention are as follows: Due to the adoption of the above technical solution, the compensation mechanism enables the grinding wheel to be fed along the workpiece direction, achieving compensation operation. The ratchet lever rotates the ratchet to feed the grinding wheel, ensuring accurate and consistent feed amount and achieving precise feeding. The pressure angle dressing mechanism and the tip dressing mechanism are integrated with the grinding wheel, enabling automatic grinding wheel dressing. The piston rod, piston rack, electrode, and drive shaft in the compensation mechanism, pressure angle dressing mechanism, and tip dressing mechanism enable grinding wheel compensation and coordinated operation of the grinding wheel pressure angle and tip dressing, significantly improving work efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the grinding wheel and grinding head assembly provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the grinding wheel assembly provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the installation position of the compensation mechanism component provided in an embodiment of the present invention;

[0020] Figure 4 This is an installation diagram of the driving gear, driven gear, and screw provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the pressure angle dressing mechanism in the grinding wheel assembly provided in this embodiment of the invention;

[0022] Figure 6 This is a schematic diagram of the top dressing mechanism in the grinding wheel assembly provided in this embodiment of the invention;

[0023] Figure 7 This is a schematic diagram of the transmission structure of the transmission shaft provided in an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the component structure of the pressure angle trimming mechanism and the top trimming mechanism provided in the embodiments of the present invention.

[0025] In the diagram: 1. Housing; 2. Main shaft; 3. Grinding wheel; 4. Compensation mechanism; 401. Needle roller assembly; 402. Lifting frame; 403. Ratchet; 404. Piston rod; 405. Ratchet lever; 406. Drive gear; 407. Screw; 408. Driven gear; 409. Nut; 410. Reset adjustment hole; 411. First cylinder body; 5. Pressure angle adjustment mechanism; 501. Pressure angle adjustment arm; 502. First mounting frame; 503. Second cylinder body; 504. Piston rack; 505. Electrode; 506. First gear; 507. First mounting shaft; 508. First sector gear; 509. 510. Second gear; 511. First rack; 512. Second sector gear; 513. Fifth gear; 6. Top trimming mechanism; 601. Top trimming arm; 602. Second mounting frame; 603. Second mounting shaft; 604. Third gear; 605. Fourth gear; 606. Lifting cam; 607. Drive shaft; 608. Sixth gear; 609. Swinging body; 610. Mating groove; 611. Rack shaft; 612. Second rack; 613. Third rack; 614. Rotating shaft; 615. Helical gear; 616. Track cam; 617. Limiting screw; 618. Tension spring; 7. Mounting cavity. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] like Figures 1 to 8As shown, this application provides a grinding wheel assembly, including a housing 1, a spindle 2 penetrating the housing 1, and a grinding wheel 3 disposed at one end of the spindle 2. The housing 1 is provided with a mounting cavity 7, and the mounting cavity 7 is provided with a compensation mechanism 4 that can drive the spindle 2 and the grinding wheel 3 to feed along the workpiece direction. The compensation mechanism 4 includes a lifting frame 402 that can move vertically along the inner wall of the mounting cavity 7. Specifically, the lifting frame 402 is disposed on the inner wall of the mounting cavity 7 through a needle roller row 401. The main shaft 2 is horizontally positioned within the mounting cavity 7 and extends through the lifting frame 402 at both ends. A first hydraulic cylinder 411 is mounted on the upper surface of the lifting frame 402. A ratchet 403 is mounted inside the first hydraulic cylinder 411 via a rotating shaft. A piston rod 404 is located within the first hydraulic cylinder 411 on one side of the ratchet 403. A ratchet lever 405 for actuating the ratchet 403 is mounted on the piston rod 404. A drive gear 406, rotating synchronously with the ratchet 403, is mounted on the rotating shaft containing the ratchet 403. A screw 407 is located on one side of the drive gear 406. A driven gear 408 meshes with the drive gear 406 on the screw 407. The lower end of the screw 407 extends through the first hydraulic cylinder 411 into the lifting frame 402 and is fitted with a nut 409, which is connected to the lifting frame 402. A reset adjustment hole 410 is provided on the upper surface of the screw 407. Specifically, the reset adjustment hole 410 is a hexagonal hole, and the grinding wheel 3 can be reset and replaced by rotating the reset adjustment hole 410.

[0028] A pressure angle trimming mechanism 5 is provided on one side of the housing 1. The pressure angle trimming mechanism 5 includes a pressure angle trimming arm 501 disposed on one side of the working end face of the grinding wheel 3 and a first mounting frame 502 disposed on one side of the housing 1. A second cylinder body 503 is disposed within the first mounting frame 502, and a piston rack 504 is disposed within the second cylinder body 503. A first gear 506 meshing with the piston rack 504 is disposed at the lower end of the second cylinder body 503. A first mounting shaft 507 is disposed on one side of the first gear 506, and a first sector gear 508 and a second gear 509 are disposed on the first mounting shaft 507. The first sector gear 508 meshes with the first gear 506. A first rack 510 meshing with the second gear 509 is disposed within the first mounting frame 502. Preferably, the first rack 510 is set at a 20° angle relative to the plane of the grinding wheel 3. This ensures that the movement trajectory of the pressure angle trimming motion is the same as the pressure angle of the grinding wheel 3, guaranteeing the accuracy of the trimming. The pressure angle trimming arm 501 is provided with a pressure angle trimming tool near the end of the grinding wheel 3, and the end of the pressure angle trimming arm 501 away from the grinding wheel 3 is connected to the upper end of the first rack 510.

[0029] Electrodes 505 for feeding back signals to the hydraulic station are respectively provided on the second cylinder bodies 503 at both ends of the piston rack 504. Specifically, the second cylinder bodies 503 and the piston rack 504 are both made of metal, and the mounting brackets for the electrodes 505 on both sides are made of bakelite. The two electrodes 505 are insulated from the second cylinder bodies 503 and the piston rack 504. When the end of the piston rack 504 contacts the electrode 505, the second cylinder body 503, the piston rack 504 and the electrode 505 form a current loop. When energized, the signal circuit breaker can control the forward and reverse rotation of the hydraulic system. The two electrodes 505 at both ends of the second cylinder body 503 control two signals respectively.

[0030] A top dressing mechanism 6 is provided on the other side of the housing 1 of the relative pressure angle dressing mechanism 5. The top dressing mechanism 6 includes a top dressing arm 601 provided on one side of the working end face of the grinding wheel 3 and a second mounting frame 602 provided on one side of the housing 1. A second mounting shaft 603 is provided inside the second mounting frame 602. A third gear 604, a fourth gear 605 and a lifting cam 606 are sequentially provided on the second mounting shaft 603.

[0031] A second sector gear 511 is provided on the first mounting shaft 507, and a transmission shaft 607 is horizontally provided at the lower end of the housing 1. A fifth gear 512 is provided on the transmission shaft 607 corresponding to the pressure angle trimming mechanism 5. The second sector gear 511 meshes with the fifth gear 512. A sixth gear 608 is provided on the transmission shaft 607 corresponding to the top trimming mechanism 6. The third gear 604 meshes with the sixth gear 608.

[0032] A hollow cylindrical swing body 609 is provided on one side of the second mounting shaft 603. The lower end of the swing body 609 is provided with a mating groove 610 that cooperates with the lifting cam 606. A rack shaft 611 is vertically arranged inside the swing body 609. The lower end of the rack shaft 611 is provided with a second rack 612 that meshes with the fourth gear 605. The upper end of the rack shaft 611 is provided with a third rack 613. A rotating shaft 614 is horizontally arranged at the upper end of the swing body 609. A helical gear 615 that meshes with the third rack 613 is arranged on the rotating shaft 614. A top dressing tool is provided near the grinding wheel 3 of the top dressing arm 601. The end of the top dressing arm 601 away from the grinding wheel 3 is connected to the rotating shaft 614.

[0033] A trajectory cam 616 is provided at the other end of the rotating shaft 614 connected to the top dressing arm 601. A limiting screw 617 is provided on the upper surface of the second mounting frame 602 via a mounting bracket. The limiting screw 617 cooperates with the trajectory cam 616. The trajectory cam 616 and the limiting screw 617 restrict the movement trajectory of the top dressing arm 601 after it extends. During the extension process, the position is limited to the point where the top of the grinding wheel 3 touches the grinding wheel 3 and the top dressing tool is flipped to dress the top of the grinding wheel 3. A tension spring 618 is provided on the outer wall of the upper end of the swing body 609 between it and the housing 1. The tension spring 618 ensures that the limiting screw 617 is tightly engaged with the trajectory cam 616.

[0034] The grinding wheel 3 grinding head assembly has a grinding wheel 3 compensation function and a dressing function. These two functions are achieved by hydraulic control, gear transmission and gear shaft linkage. The dressing speed is controlled by a speed regulating valve.

[0035] When the compensation function is working, the hydraulic oil pushes the piston rod 404 in the first cylinder body 411. The ratchet lever 405 on the piston rod 404 pushes the ratchet 403 to rotate at a certain angle. The driving gear 406 on the rotating shaft where the ratchet 403 is located is linked with the ratchet 403 and transmits the power to the driven gear 408 that meshes with the driving gear 406. This drives the screw 407 where the driven gear 408 is located to rotate. Under the rotation of the screw 407, the nut 409 drives the lifting frame 402 to move upward, thereby causing the grinding wheel 3 to move towards the workpiece to perform the compensation action.

[0036] Pressure angle adjustment process: Hydraulic oil pushes the piston rack 504 in the second cylinder 503, causing the first gear 506 meshing with the piston rack 504 to rotate. This, in turn, drives the first sector gear 508 meshing with the first gear 506 to rotate at a certain angle, which in turn drives the first mounting shaft 507 to rotate. The second gear 509 on the first mounting shaft 507 rotates accordingly, pushing the first rack 510 to move, thereby pushing the pressure angle adjustment arm 501 to move. Since the first rack 510 is set at a 20° angle relative to the plane of the grinding wheel 3, the pressure angle adjustment arm 501 moves at a 20° angle towards the top of the grinding wheel 3, thus realizing the pressure angle adjustment of the grinding wheel 3. When the piston rack 504 moves to one end and touches the electrode 505, the adjustment is completed. The hydraulic oil pump reverses direction, and the piston rack 504 moves in the opposite direction, driving the above mechanism to perform a return motion. When the piston rack 504 touches the tail electrode 505, the hydraulic oil pump receives a signal and stops rotating. The entire grinding wheel 3 compensation adjustment is completed.

[0037] Top trimming process: The first mounting shaft 507 rotates, driving the second sector gear 511 to rotate, which in turn drives the transmission shaft 607 to rotate via the fifth gear 512 and transmits power. The rotation of the transmission shaft 607 causes the sixth gear 608 on the transmission shaft 607 on the corresponding side of the top trimming mechanism 6 to drive the third gear 604 to rotate, which in turn drives the second mounting shaft 603 to rotate. The fourth gear 605 and the lifting cam 606 on the second mounting shaft 603 rotate accordingly. The lifting cam 606 rotates in the mating groove 610 and pushes the swing body 609 upward. The swing body 609 rises a certain distance along the trajectory formed by the cam 616 and the limiting screw 617 to reach the limit. The lifting cam 606 then disengages from the mating groove 610. As the oscillating body 609 reaches its position, the fourth gear 605 pushes the second rack 612 at the lower end of the rack shaft 611, causing the third rack 613 at the upper end of the rack shaft 611 to move and drive the helical gear 615 to rotate. This, in turn, drives the rotating shaft 614 and the top dressing arm 601 to rotate along the outer circle of the track cam 616, and around the grinding wheel 3, completing the top circle dressing of the grinding wheel 3. The movement stops when the sixth gear 608 stops.

[0038] The complete working process of the grinding wheel 3 assembly is as follows: After the dressing starts, the pressurized oil pushes the piston rod 404 to drive the ratchet 403 to rotate at a certain angle, which in turn drives the coaxial drive gear 406 to rotate. This drives the meshing driven gear 408 and screw 407 to push the grinding wheel 3 spindle 2, thereby causing the grinding wheel 3 to move a fixed distance once. Then, hydraulic oil enters the tool dressing oil chamber to push the piston rack 504. The piston rack 504 drives the first gear 506 to drive the first sector gear 508. The first sector gear 508 is coaxially mounted with the second sector gear 511 and the second gear 509. The second sector gear 511 drives the transmission shaft 607 to transmit power to the other side. The top dressing mechanism 6 has a second gear 509 that drives the first rack 510 to move linearly, achieving pressure angle dressing of the grinding wheel 3. The transmission shaft 607 is equipped with a sixth gear 608 that drives the third gear 604 to rotate. The shaft on which the third gear 604 is located is equipped with a fourth gear 605 and a lifting cam 606. The lifting cam 606 pushes the swing body 609 to extend a certain distance and disengage to continue rotating. The fourth gear 605 drives the rack shaft 611 to move together with the swing body 609. The upper end of the rack shaft 611 drives the helical gear to rotate, and drives the rotating shaft 614 and the top dressing arm 601 to rotate along the outer circle of the trajectory cam 616, realizing the top dressing trajectory.

[0039] By adopting the above technical solution, the compensation mechanism 4 can realize the feeding of the grinding wheel 3 along the workpiece direction, and realize the compensation operation. The ratchet lever 405 drives the ratchet 403 to rotate, realizing the feeding of the grinding wheel 3, which can ensure the accuracy and uniformity of the feed amount and achieve precise feeding. The pressure angle dressing mechanism 5 and the top dressing mechanism 6 are integrated with the grinding wheel 3, which can realize automatic dressing of the grinding wheel 3. Through the piston rod 404, piston rack 504, electrode 505 and drive shaft 607 set in the compensation mechanism 4, pressure angle dressing mechanism 5 and top dressing mechanism 6, the compensation of the grinding wheel 3 and the linkage operation of the pressure angle and top dressing of the grinding wheel 3 can be realized, which greatly improves the work efficiency.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A grinding wheel head assembly, characterized in that, The assembly includes a housing (1), a spindle (2) passing through the housing (1), and a grinding wheel (3) disposed at one end of the spindle (2). The housing (1) is provided with an installation cavity (7). The installation cavity (7) is provided with a compensation mechanism (4) that can drive the spindle (2) and the grinding wheel (3) to feed along the workpiece direction. The compensation mechanism (4) includes a lifting frame (402) that can move vertically along the inner wall of the installation cavity (7). The spindle (2) is horizontally disposed in the installation cavity (7) and its two ends pass through the lifting frame (402). The upper end face of the lifting frame (402) is provided with a first cylinder body (411). A ratchet (403) is provided in the first cylinder body (411) through a rotating shaft. A piston rod (404) is provided in the first cylinder body (411) on one side of the ratchet (403). A ratchet lever (405) for actuating the ratchet (403) is provided on the piston rod (404). A drive gear (406) that rotates synchronously with the ratchet (403) is provided on the rotating shaft where the ratchet (403) is located. A screw (407) is provided on one side of the drive gear (406). A driven gear (408) that meshes with the drive gear (406) is provided on the screw (407). The lower end of the screw (407) extends through the first cylinder body (411) into the lifting frame (402) and is provided with a nut (409). The nut (409) is connected to the lifting frame (402). A pressure angle adjustment mechanism (5) is provided on one side of the housing (1). The pressure angle adjustment mechanism (5) includes a pressure angle adjustment arm (501) provided on one side of the working end face of the grinding wheel (3) and a first mounting frame (502) provided on one side of the housing (1). A second cylinder body (503) is provided inside the first mounting frame (502). A piston rack (504) is provided inside the second cylinder body (503). A first gear (506) is provided at the lower end of the second cylinder body (503) and meshes with the piston rack (504). A first mounting shaft (507) is provided on one side, and a first sector gear (508) and a second gear (509) are provided on the first mounting shaft (507). The first sector gear (508) meshes with the first gear (506). A first rack (510) meshes with the second gear (509) is provided inside the first mounting frame (502). A pressure angle trimming tool is provided at the end of the pressure angle trimming arm (501) near the grinding wheel (3). The end of the pressure angle trimming arm (501) away from the grinding wheel (3) is connected to the upper end of the first rack (510).

2. The grinding wheel assembly according to claim 1, characterized in that, The first rack (510) is set at a 20° angle relative to the plane of the grinding wheel (3).

3. The grinding wheel and grinding head assembly according to claim 1, characterized in that, Electrodes (505) for feeding back signals to the hydraulic station are respectively provided on the second cylinder bodies (503) at both ends of the piston rack (504).

4. The grinding wheel and grinding head assembly according to claim 1, characterized in that, A top dressing mechanism (6) is provided on the other side of the housing (1) of the relative pressure angle dressing mechanism (5). The top dressing mechanism (6) includes a top dressing arm (601) provided on one side of the working end face of the grinding wheel (3) and a second mounting frame (602) provided on one side of the housing (1). A second mounting shaft (603) is provided inside the second mounting frame (602). A third gear (604), a fourth gear (605) and a lifting cam (606) are sequentially provided on the second mounting shaft (603). A second sector gear (511) is provided on the first mounting shaft (507), and a transmission shaft (607) is horizontally provided at the lower end of the housing (1). A fifth gear (512) is provided on the transmission shaft (607) corresponding to the pressure angle trimming mechanism (5). The second sector gear (511) meshes with the fifth gear (512). A sixth gear (608) is provided on the transmission shaft (607) corresponding to the top trimming mechanism (6). The third gear (604) meshes with the sixth gear (608). A hollow cylindrical swing body (609) is provided on one side of the second mounting shaft (603). The lower end of the swing body (609) is provided with a mating groove (610) that cooperates with the lifting cam (606). A rack shaft (611) is vertically arranged inside the swing body (609). A second rack (612) that meshes with the fourth gear (605) is provided at the lower end of the rack shaft (611). A third rack (613) is provided at the upper end of the rack shaft (611). A rotating shaft (614) is horizontally arranged at the upper end of the swing body (609). A helical gear (615) that meshes with the third rack (613) is provided on the rotating shaft (614). A top dressing tool is provided at the end of the top dressing arm (601) near the grinding wheel (3). The end of the top dressing arm (601) away from the grinding wheel (3) is connected to the rotating shaft (614).

5. The grinding wheel assembly according to claim 4, characterized in that, A trajectory cam (616) is provided at the other end of the rotating shaft (614) connected to the top trimming arm (601). A limiting set screw (617) is provided on the upper surface of the second mounting frame (602) through a mounting bracket. The limiting set screw (617) cooperates with the trajectory cam (616).

6. The grinding wheel assembly according to claim 4, characterized in that, A tension spring (618) is provided between the outer wall of the upper end of the swing body (609) and the box (1).

7. The grinding wheel assembly according to claim 1, characterized in that, The upper end face of the screw (407) is provided with a reset adjustment hole (410).

8. The grinding wheel and grinding head assembly according to claim 1, characterized in that, The lifting frame (402) is mounted on the inner wall of the mounting cavity (7) via a needle roller array (401).

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