Polishing device for rubber roller machining

Abstract

The utility model relates to the field of rubber roller machining devices, in particular to a grinding device for rubber roller machining, and solves the technical problems that the grinding effect of the grinding device on a rubber roller is poor, and sweeps generated in the grinding process cannot be collected. According to the technical scheme, the grinding device for rubber roller machining comprises a bottom plate, a scrap collecting plate, supporting feet, a waste scrap box, a grinding box, a fixed assembly, a movable assembly and a grinding assembly; through combined operation of the fixing assembly, the moving assembly and the grinding assembly, the rubber covered roller can be prevented from shaking during grinding, the position and the moving speed of the arc-shaped grinding plate can be accurately controlled, dead-angle-free and high-efficiency grinding coverage is achieved, in addition, the grinding assembly can be matched with rubber covered rollers of different sizes, and the grinding efficiency is improved. In this way, various polishing requirements are met, and the problems that the polishing effect of a polishing device on the rubber roller is poor, and sweeps generated in the polishing process cannot be collected are solved.

Description

Technical Field

[0001] The utility model relates to the field of rubber roller processing devices, in particular to a grinding device used for rubber roller processing. Background Art

[0002] The rubber roller is a product carefully constructed of a metal core, a hard rubber layer, an outer rubber layer, a roller neck and other components. The surface of the rubber roller after rubber coating often leaves unevenness and burrs due to process limitations. It is necessary to use grinding equipment to restore the smoothness and perfection of the rubber roller surface to ensure its excellent performance and durability in subsequent applications.

[0003] The existing grinding device mainly uses a grinding wheel or a grinding head to grind the rubber roller, but this grinding method has a poor grinding effect on the rubber roller and cannot completely cover the surface of the rubber roller. In addition, a large amount of debris will be generated during the grinding operation of the rubber roller, and these debris often cannot be effectively and centrally processed, thereby polluting the working environment.

[0004] Therefore, in view of the fact that the above-mentioned grinding device has poor grinding effect on the rubber roller and the waste chips generated during the grinding process cannot be collected, a grinding device for rubber roller processing can be designed. Through pneumatic telescopic adjustment and threaded transmission structure, it can perform all-round grinding on rubber rollers of different sizes and facilitate the collection of waste chips generated during grinding. Utility Model Content

[0005] In order to overcome the problem that the grinding effect of the grinding device on the rubber roller is poor and the waste chips generated during the grinding process cannot be collected.

[0006] The technical solution of the utility model is: a grinding device for rubber roller processing, comprising a base plate, a chip collecting plate, a support leg, a waste chip box, a grinding box, a fixed component, a movable component and a grinding component; a funnel-shaped chip collecting plate is installed at the lower end of the base plate, and the left and right outer walls of the chip collecting plate are fixedly connected with support legs for support, a waste chip box for collecting waste chips is provided at the lower end of the chip collecting plate, a grinding box is installed at the upper end of the base plate, and the bottom of the grinding box and the upper end of the base plate are both provided with mesh waste chip outlets, the fixed component is driven to rotate by a motor and is installed in the grinding box, a threaded transmission structure is provided in the movable component and is installed in the grinding box, the movable component is located at the upper end of the fixed component, and a threaded transmission structure is provided in the grinding component and is installed at the lower end of the No. 1 movable seat in the movable component.

[0007] Preferably, the base plate serves as the basic support platform for the entire device, the chip collecting plate is designed to be funnel-shaped, and is used to collect waste chips generated during the grinding process and guide them to flow into the waste chip box. The legs support the base plate and the entire device to ensure that the device is firmly placed on the ground. The grinding box is used to provide a place for grinding the rubber roller. The fixed component is driven to rotate by a motor, and is used to fix and rotate the rubber roller to be grinded so as to perform all-round grinding. The moving component drives the arc-shaped grinding plate to move left and right, and the grinding component brings the two arc-shaped grinding plates close to the rubber roller, thereby grinding the rubber roller.

[0008] Preferably, the fixing assembly includes a cylinder, a support plate and a No. 1 rotating support seat; the cylinder is installed on the left inner wall of the polishing box, the right end of the cylinder power output element is fixedly connected to the support plate, and the No. 1 rotating support seat is installed on the right inner wall of the polishing box. The cylinder serves as a power source, and pushes the support plate and the servo motor fixed on the support plate to move through its telescopic movement, thereby meeting the needs of fixing rubber rollers of different sizes. The support plate serves as a supporting platform for the servo motor and the rubber roller, and the No. 1 rotating support seat provides stable rotation support for the right end of the rubber roller, ensuring that the rubber roller does not shake during rotation.

[0009] Preferably, the fixing assembly also includes a servo motor, a coupling and a rubber roller; the servo motor is installed at the upper end of the support plate, the left end of the rubber roller is installed with a coupling and is connected to the output shaft of the servo motor through the coupling, and the right end of the rubber roller is rotatably connected to the No. 1 rotating support seat. The servo motor provides rotational power for the rubber roller and is connected to the left end of the rubber roller through the coupling to drive the rubber roller to rotate. The servo motor has high-precision speed control and stability, which can ensure that the rubber roller rotates at a constant speed during the grinding process.

[0010] Preferably, the moving assembly includes a crossbeam, a No. 1 U-shaped groove, a No. 1 rotating motor and a No. 2 rotating support seat; a No. 1 U-shaped groove is provided at the lower end of the crossbeam and the right end is fixedly connected to the right inner wall of the polishing box, the No. 1 rotating motor is installed at the left end of the crossbeam, and the No. 2 rotating support seat is installed on the right inner wall of the No. 1 U-shaped groove. The crossbeam serves as the supporting structure of the entire moving assembly, the No. 1 U-shaped groove is used to install and fix the No. 2 rotating support seat and provide a moving track for the No. 1 moving seat, the No. 1 rotating motor provides rotational power for the one-way threaded rod, and drives the No. 1 moving seat to move left and right by rotating the one-way threaded rod, and the No. 2 rotating support seat provides stable rotational support for the right end of the one-way threaded rod.

[0011] Preferably, the moving assembly also includes a one-way threaded rod and a moving seat No. 1; the right end of the one-way threaded rod is rotatably connected to the No. 2 rotating support seat, the left end of the one-way threaded rod is fixedly connected to the output shaft of the No. 1 rotating motor, and the No. 1 rotating seat is provided with an internal thread that matches the external thread of the one-way threaded rod, the one-way threaded rod is threadedly connected to the No. 1 moving seat, and the one-way threaded rod serves as a transmission element, and its external thread cooperates with the internal thread in the No. 1 moving seat to convert the rotational motion of the No. 1 rotating motor into linear motion of the No. 1 moving seat, and a grinding assembly is installed at the lower end of the No. 1 moving seat, so that the grinding assembly can move left and right.

[0012] Preferably, the grinding assembly includes a longitudinal beam, a No. 2 U-shaped groove, a No. 2 rotating motor, a No. 3 rotating support seat and a bidirectional threaded rod; the lower end of the longitudinal beam is provided with a No. 2 U-shaped groove and the upper end is fixedly connected to the lower end of the No. 1 moving seat, the No. 2 rotating motor is installed at the rear end of the longitudinal beam, the No. 3 rotating support seat is installed on the front inner wall of the No. 2 U-shaped groove, the front and rear ends of the bidirectional threaded rod are provided with two sets of external threads in opposite directions, the front end of the bidirectional threaded rod is rotatably connected to the No. 3 rotating support seat, and the rear end of the bidirectional threaded rod is fixedly connected to the output shaft of the No. 2 rotating motor The longitudinal beam serves as the main supporting structure of the grinding assembly. The No. 2 U-shaped groove provides an installation position for the No. 3 rotating support seat and serves as the moving track for the No. 2 moving seat and the No. 3 moving seat. The No. 2 rotating motor provides rotational power for the bidirectional threaded rod, and drives the No. 2 moving seat and the No. 3 moving seat to move toward each other by rotating the bidirectional threaded rod. The No. 3 rotating support seat provides stable rotational support for the front end of the bidirectional threaded rod. The bidirectional threaded rod serves as a transmission element, and the opposite external threads at its front and rear ends are used to realize the opposite movement of the No. 2 moving seat and the No. 3 moving seat.

[0013] Preferably, the grinding assembly also includes a No. 2 movable seat, a No. 3 movable seat and an arc-shaped grinding plate; the No. 2 movable seat is provided with an internal thread that matches the rear end external thread of the two-way threaded rod, the rear end of the two-way threaded rod is threadedly connected to the No. 2 movable seat, the No. 3 movable seat is provided with an internal thread that matches the front end external thread of the two-way threaded rod, the front end of the two-way threaded rod is threadedly connected to the No. 3 movable seat, the lower ends of the No. 2 movable seat and the No. 3 movable seat are fixedly connected with an arc-shaped grinding plate, the No. 2 movable seat and the No. 3 movable seat cooperate with the two-way threaded rod through their internal threads to achieve forward and backward movement, thereby approaching the rubber roller, the movable seat is fixedly connected with the arc-shaped grinding plate, and the rubber roller is polished through the rotation with the rubber roller.

[0014] Beneficial effects of the utility model:

[0015] 1. Through the joint operation of the fixed component, the moving component and the grinding component, not only can the shaking of the rubber roller be avoided during grinding, but also the position and moving speed of the arc-shaped grinding plate can be accurately controlled to achieve no dead angle and high-efficiency grinding coverage. In addition, the grinding component can adapt to rubber rollers of different sizes to meet various grinding needs;

[0016] 2. The chip collecting plate is used to collect the waste chips generated during the grinding process and guide them to the waste chip box, so as to facilitate the workers to centrally handle the waste chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure shows a three-dimensional structure diagram of a grinding device for rubber roller processing of the utility model;

[0018] Figure 2 The figure shows a front view schematic diagram of a grinding device for rubber roller processing of the utility model;

[0019] Figure 3 Shown is a top view schematic diagram of a grinding device for rubber roller processing of the utility model;

[0020] Figure 4 The figure shows a three-dimensional structure diagram of a fixing assembly of a grinding device for rubber roller processing of the utility model;

[0021] Figure 5 The present invention is a schematic diagram of the three-dimensional structure of the movable assembly of the grinding device for rubber roller processing;

[0022] Figure 6 What is shown is a schematic diagram of the three-dimensional structure of the grinding assembly of the grinding device for rubber roller processing of the utility model.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. bottom plate; 2. chip collecting plate; 3. supporting leg; 4. waste chip box; 5. grinding box; 601. cylinder; 602. supporting plate; 603. rotating support seat No. 1; 604. servo motor; 605. coupling; 606. rubber roller; 701. crossbeam; 702. U-shaped groove No. 1; 703. rotating motor No. 1; 704. rotating support seat No. 2; 705. one-way threaded rod; 706. moving seat No. 1; 801. longitudinal beam; 802. U-shaped groove No. 2; 803. rotating motor No. 2; 804. rotating support seat No. 3; 805. two-way threaded rod; 806. moving seat No. 2; 807. moving seat No. 3; 808. arc-shaped grinding plate. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-Figure 3The utility model provides an embodiment: a grinding device for processing a rubber roller 606, comprising a bottom plate 1, a chip collecting plate 2, a support leg 3, a waste chip box 4, a grinding box 5, a fixed component, a moving component and a grinding component; a funnel-shaped chip collecting plate 2 is installed at the lower end of the bottom plate 1, and the left and right outer walls of the chip collecting plate 2 are fixedly connected with the support legs 3 for support, a waste chip box 4 for collecting waste chips is arranged at the lower end of the chip collecting plate 2, a grinding box 5 is installed at the upper end of the bottom plate 1, and a mesh-shaped waste chip outlet is provided at the bottom of the grinding box 5 and the upper end of the bottom plate 1, the fixed component is driven to rotate by a motor and is installed in the grinding box 5, a threaded transmission structure is arranged in the moving component and is installed in the grinding box 5, and the moving component is located at the upper end of the fixed component, A threaded transmission structure is provided in the grinding component and is installed at the lower end of the No. 1 moving seat 706 in the moving component. The base plate 1 serves as the basic support platform of the entire device. The chip collecting plate 2 is designed to be funnel-shaped, which is used to collect waste chips generated during the grinding process and guide them to flow to the waste chip box 4. The support legs 3 support the base plate 1 and the entire device to ensure that the device is firmly placed on the ground. The grinding box 5 is used to provide a place for grinding the rubber roller 606. The fixed component is driven to rotate by a motor, which is used to fix and rotate the rubber roller 606 to be polished so as to perform all-round grinding. The moving component drives the arc-shaped grinding plate 808 to move left and right. The grinding component makes the two arc-shaped grinding plates 808 close to the rubber roller 606, thereby grinding the rubber roller 606.

[0026] See also Figure 4 In this embodiment, the fixed component includes a cylinder 601, a support plate 602 and a No. 1 rotating support seat 603; the cylinder 601 is installed on the left inner wall of the polishing box 5, the right end of the cylinder 601 power output element is fixedly connected with the support plate 602, and the No. 1 rotating support seat 603 is installed on the right inner wall of the polishing box 5. The fixed component also includes a servo motor 604, a coupling 605 and a rubber roller 606; the servo motor 604 is installed on the upper end of the support plate 602, the left end of the rubber roller 606 is installed with a coupling 605 and is connected to the output shaft of the servo motor 604 through the coupling 605, the right end of the rubber roller 606 is rotatably connected to the No. 1 rotating support seat 603, and the cylinder 601 is used as a power source , through its telescopic movement, it pushes the support plate 602 and the servo motor 604 fixed on the support plate 602 to move, so as to meet the needs of fixing rubber rollers 606 of different sizes. The support plate 602 serves as a supporting platform for the servo motor 604 and the rubber roller 606. The No. 1 rotating support seat 603 provides stable rotation support for the right end of the rubber roller 606 to ensure that the rubber roller 606 does not shake during rotation. The servo motor 604 provides rotational power for the rubber roller 606, and is connected to the left end of the rubber roller 606 through the coupling 605 to drive the rubber roller 606 to rotate. The servo motor 604 has high-precision speed control and stability, which can ensure that the rubber roller 606 rotates at a constant speed during the grinding process.

[0027] See also Figure 5-Figure 6In this embodiment, the moving assembly includes a crossbeam 701, a No. 1 U-shaped groove 702, a No. 1 rotating motor 703 and a No. 2 rotating support seat 704; the lower end of the crossbeam 701 is provided with a No. 1 U-shaped groove 702 and the right end is fixedly connected to the right inner wall of the grinding box 5, the No. 1 rotating motor 703 is installed at the left end of the crossbeam 701, and the No. 2 rotating support seat 704 is installed on the right inner wall of the No. 1 U-shaped groove 702. The moving assembly also includes a one-way threaded rod 705 and a No. 1 moving seat 706; the right end of the one-way threaded rod 705 is rotatably connected to the No. 2 rotating support seat 704, and the one-way threaded rod 70 The left end of the first rotating motor 703 is fixedly connected to the output shaft of the first rotating motor 703, the first moving seat 706 is provided with an internal thread that matches the external thread of the one-way threaded rod, the one-way threaded rod 705 is threadedly connected to the first moving seat 706, the crossbeam 701 serves as the supporting structure of the entire moving assembly, the first U-shaped groove 702 is used to install and fix the second rotating support seat 704, and provides a moving track for the first moving seat 706, the first rotating motor 703 provides a rotating power for the one-way threaded rod 705, and drives the first moving seat 706 to move left and right by rotating the one-way threaded rod 705, and the second rotating seat 706 is driven to move left and right. The rotating support seat 704 provides a stable rotating support for the right end of the one-way threaded rod 705. The one-way threaded rod 705 serves as a transmission element. Through its external thread, it cooperates with the internal thread in the No. 1 moving seat 706 to convert the rotating motion of the No. 1 rotating motor 703 into the linear motion of the No. 1 moving seat 706. A grinding assembly is installed at the lower end of the No. 1 moving seat 706, so that the grinding assembly can move left and right. The grinding assembly includes a longitudinal beam 801, a No. 2 U-shaped groove 802, a No. 2 rotating motor 803, a No. 3 rotating support seat 804 and a two-way threaded rod 805; the lower end of the longitudinal beam 801 is provided with There is a No. 2 U-shaped groove 802 and the upper end is fixedly connected to the lower end of the No. 1 moving seat 706, the No. 2 rotating motor 803 is installed on the rear end of the longitudinal beam 801, the No. 3 rotating support seat 804 is installed on the front inner wall of the No. 2 U-shaped groove 802, the front and rear ends of the bidirectional threaded rod 805 are provided with two sets of external threads in opposite directions, the front end of the bidirectional threaded rod 805 is rotatably connected to the No. 3 rotating support seat 804, the rear end of the bidirectional threaded rod 805 is fixedly connected to the output shaft of the No. 2 rotating motor 803, and the grinding assembly also includes the No. 2 moving seat 806, the No. 3 moving seat 807 and the arc-shaped grinding plate 808;The second moving seat 806 is provided with an internal thread that matches the rear end external thread of the two-way threaded rod 805, the rear end of the two-way threaded rod 805 is threadedly connected to the second moving seat 806, the third moving seat 807 is provided with an internal thread that matches the front end external thread of the two-way threaded rod 805, the front end of the two-way threaded rod 805 is threadedly connected to the third moving seat 807, the lower ends of the second moving seat 806 and the third moving seat 807 are fixedly connected with an arc-shaped grinding plate 808, the longitudinal beam 801 serves as the main supporting structure of the grinding assembly, the second U-shaped groove 802 provides an installation position for the third rotating support seat 804, and serves as a moving track for the second moving seat 806 and the third moving seat 807, and the second rotating motor 80 3 provides rotational power for the bidirectional threaded rod 805, and drives the second moving seat 806 and the third moving seat to move toward each other by rotating the bidirectional threaded rod 805. The third rotating support seat 804 provides stable rotational support for the front end of the bidirectional threaded rod 805. The bidirectional threaded rod 805 is used as a transmission element. Through its external threads at the front and rear ends with opposite directions, the second moving seat 806 and the third moving seat 807 can move toward each other. The second moving seat 806 and the third moving seat 807 can cooperate with the bidirectional threaded rod 805 through their internal threads to move forward and backward, so as to approach the rubber roller 606. The arc-shaped grinding plate 808 is fixedly connected to the moving seat, and the rubber roller 606 is grinded by the rotation with the rubber roller 606. ;

[0028] In the operation process, firstly, the telescopic distance of the cylinder 601 is finely adjusted according to the specific size of the rubber roller 606, so as to drive the precise displacement of the support plate 602 and the servo motor 604, and then, the left end of the rubber roller 606 is connected to the coupling 605, and at the same time, the right end of the rubber roller 606 is ensured to be securely installed in the No. 1 rotating support seat 603;

[0029] Next, the second rotary motor 803 is activated, and its power drives the bidirectional threaded rod 805 to rotate. Through the interaction between the threads, the second moving seat 806 and the third moving seat 807 move flexibly in the front-back direction in coordination, slowly approaching the rubber roller 606, until the inner wall of the arc-shaped grinding plate 808 fits perfectly with the outer wall of the rubber roller 606, forming a preparation state before grinding;

[0030] At this moment, the servo motor 604 is started, which drives the rubber roller 606 to rotate, and the arc-shaped grinding plate 808 grinds the surface of the rubber roller 606 finely and evenly;

[0031] If the specific grinding position needs to be adjusted, start the No. 1 rotary motor 703, which drives the one-way threaded rod 705 to rotate. Under the precise control of the thread, the No. 1 moving seat 706 moves freely left and right, and then pulls the longitudinal beam 801 and the arc-shaped grinding plate 808 to be accurately adjusted to the required position, ensuring comprehensive and accurate grinding work.

[0032] Through the above steps, through the joint operation of the fixed component, the moving component and the grinding component, not only can the shaking of the rubber roller 606 during grinding be avoided, but also the position and moving speed of the arc-shaped grinding plate 808 can be accurately controlled to achieve dead angle-free and highly efficient grinding coverage. In addition, the grinding component can adapt to rubber rollers 606 of different sizes to meet various grinding needs, thereby solving the problem that the grinding effect of the grinding device on the rubber roller 606 is poor and the waste chips generated during the grinding process cannot be collected.

[0033] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A grinding device for processing a rubber roller, comprising a bottom plate (1), a chip collecting plate (2), a support foot (3), a waste chip box (4) and a grinding box (5); characterized in that: It also includes a fixed component, a movable component and a grinding component; a funnel-shaped chip collecting plate (2) is installed at the lower end of the base plate (1), and the left and right outer walls of the chip collecting plate (2) are fixedly connected with supporting legs (3) for support, and a waste chip box (4) for collecting waste chips is arranged at the lower end of the chip collecting plate (2); a grinding box (5) is installed at the upper end of the base plate (1); the bottom of the grinding box (5) and the upper end of the base plate (1) are both provided with mesh waste chip outlets; the fixed component is driven to rotate by a motor and is installed in the grinding box (5); a threaded transmission structure is arranged in the movable component and is installed in the grinding box (5); the movable component is located at the upper end of the fixed component; and a threaded transmission structure is arranged in the grinding component and is installed at the lower end of the No. 1 movable seat (706) in the movable component.

2. The grinding device for rubber roller processing according to claim 1 is characterized in that: The fixed assembly comprises a cylinder (601), a support plate (602) and a first rotating support seat (603); the cylinder (601) is mounted on the left inner wall of the polishing box (5), the right end of the power output element of the cylinder (601) is fixedly connected with the support plate (602), and the first rotating support seat (603) is mounted on the right inner wall of the polishing box (5).

3. The grinding device for rubber roller processing according to claim 2 is characterized in that: The fixing assembly further comprises a servo motor (604), a coupling (605) and a rubber roller (606); the servo motor (604) is mounted on the upper end of the support plate (602); the left end of the rubber roller (606) is mounted with a coupling (605) and is connected to the output shaft of the servo motor (604) through the coupling (605); the right end of the rubber roller (606) is rotatably connected to the first rotating support seat (603).

4. The grinding device for rubber roller processing according to claim 3 is characterized in that: The moving assembly comprises a crossbeam (701), a No. 1 U-shaped groove (702), a No. 1 rotating motor (703) and a No. 2 rotating support seat (704); the lower end of the crossbeam (701) is provided with a No. 1 U-shaped groove (702) and the right end is fixedly connected to the right inner wall of the polishing box (5); the No. 1 rotating motor (703) is installed at the left end of the crossbeam (701); and the No. 2 rotating support seat (704) is installed on the right inner wall of the No. 1 U-shaped groove (702).

5. The grinding device for rubber roller processing according to claim 4 is characterized in that: The moving assembly also includes a one-way threaded rod (705) and a first moving seat (706); the right end of the one-way threaded rod (705) is rotatably connected to the second rotating support seat (704), the left end of the one-way threaded rod (705) is fixedly connected to the output shaft of the first rotating motor (703), and the first moving seat (706) is provided with an internal thread that matches the external thread of the one-way threaded rod, and the one-way threaded rod (705) is threadedly connected to the first moving seat (706).

6. The grinding device for rubber roller processing according to claim 5, characterized in that: The grinding assembly comprises a longitudinal beam (801), a No. 2 U-shaped groove (802), a No. 2 rotating motor (803), a No. 3 rotating support seat (804) and a bidirectional threaded rod (805); the lower end of the longitudinal beam (801) is provided with a No. 2 U-shaped groove (802) and the upper end is fixedly connected to the lower end of the No. 1 moving seat (706); the No. 2 rotating motor (803) is installed at the rear end of the longitudinal beam (801); the No. 3 rotating support seat (804) is installed on the front inner wall of the No. 2 U-shaped groove (802); the front and rear ends of the bidirectional threaded rod (805) are provided with two groups of external threads in opposite directions; the front end of the bidirectional threaded rod (805) is rotatably connected to the No. 3 rotating support seat (804); and the rear end of the bidirectional threaded rod (805) is fixedly connected to the output shaft of the No. 2 rotating motor (803).

7. The grinding device for rubber roller processing according to claim 6, characterized in that: The grinding assembly further comprises a second moving seat (806), a third moving seat (807) and an arc-shaped grinding plate (808); the second moving seat (806) is provided with an internal thread matched with the rear end external thread of the bidirectional threaded rod (805); the rear end of the bidirectional threaded rod (805) is threadedly connected to the second moving seat (806); the third moving seat (807) is provided with an internal thread matched with the front end external thread of the bidirectional threaded rod (805); the front end of the bidirectional threaded rod (805) is threadedly connected to the third moving seat (807); the lower ends of the second moving seat (806) and the third moving seat (807) are both fixedly connected with the arc-shaped grinding plate (808).

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