Cone pulley surface treatment device

Abstract

The invention discloses a cone pulley surface treatment device which comprises a machine base, a machining table is arranged in the center of the machine base, a positioning mechanism is arranged on the machining table, a rack is connected to the position, located on the periphery of the machining table, of the machine base, lifting mechanisms are arranged on the two sides of the rack correspondingly, and lifting bases are in transmission connection with the two lifting mechanisms correspondingly. Wherein an outer wall polishing mechanism is installed on one lifting seat, an outer wall cleaning mechanism is installed on the other lifting seat, a hydraulic cylinder is fixed to the center of the upper portion of the rack, and an inner wall polishing and cleaning integrated mechanism is installed at the telescopic end of the hydraulic cylinder. The inner wall of the cone pulley can be polished through the inner polishing block while the outer wall of the cone pulley is polished, simultaneous inner and outer polishing is achieved, the inner wall of the cone pulley is cleaned through the inner brush while polishing is conducted, and polishing and cleaning are conducted at the same time. When the inner wall of the cone pulley is polished, the sliding seat is driven by the driving mechanism to move towards the outer side of the second barrel, so that the inner polishing block can be driven to move outwards to polish the cone pulleys with different inner diameters, and the adaptability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of step pulley processing, in particular to a step pulley surface processing device. Background Art

[0002] The step pulley is a mechanical transmission device, which is mainly used to adjust the speed of the equipment by changing the transmission ratio. Figure 8 As shown, the tower wheel is composed of multiple wheels of different diameters fixed on the same shaft and arranged in a stepped manner.

[0003] When producing and processing a step wheel, it is necessary to perform surface treatment on the step wheel, such as grinding, surface cleaning, etc. However, there are currently the following problems when performing surface treatment on the step wheel: (1) Since the outer surface of the step shaft is conical and the diameter of each wheel disc is different, it is difficult for the existing grinding device to grind the outer wall of each wheel disc, and after grinding, the debris generated by grinding cannot be cleaned up immediately; (2) When grinding the outer wall, the inner wall cannot be polished at the same time, and the grinding efficiency is low; (3) When grinding the inner wall, if the diameter of the grinding block is large, it is difficult to insert it into the step wheel with a smaller inner diameter. If the diameter of the grinding block is small, after the grinding block is inserted into the step wheel, it cannot contact the inner wall, resulting in the inability to grind, resulting in poor adaptability. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a step pulley surface treatment device to solve the problems mentioned in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A surface treatment device for a tower wheel comprises a machine base, a processing table is arranged at the center of the machine base, a rotating mechanism for driving the processing table to rotate is arranged in the machine base, a plurality of grooves with the center of the processing table as the center are arranged on the processing table, a positioning mechanism for fixing the tower wheel at the center of the processing table is arranged in each groove, a frame is connected to the machine base at the periphery of the processing table, a lifting mechanism is arranged on both sides of the frame, and lifting seats are connected to the two lifting mechanisms in a driving manner, an outer wall grinding mechanism is installed on one of the lifting seats, and each wheel disc of the tower wheel can be ground by the outer wall grinding mechanism, and an outer wall cleaning mechanism is installed on the other lifting seat, and each wheel disc of the tower wheel can be cleaned by the outer wall cleaning mechanism; the machine A hydraulic cylinder is fixed at the center of the upper part of the frame, and an inner wall grinding and cleaning integrated mechanism is installed at the telescopic end of the hydraulic cylinder; the inner wall grinding and cleaning integrated mechanism includes a box body, a first motor is installed in the box body, a transmission rod is connected to the first motor through a coupling, the lower end of the transmission rod is connected to the first cylinder body, a plurality of inner brushes are connected to the outer wall of the first cylinder body, the lower end of the first cylinder body is connected to the second cylinder body, an opening is provided on one side of the second cylinder body, a slide seat is slidably connected in the opening, an inner grinding block is splined on the outer side of the slide seat, the outer wall of the inner grinding block is arc-shaped, and a driving mechanism for driving the slide seat to move in the second cylinder is provided in the second cylinder body, and the inner grinding block can be driven to make a linear motion in the opening by driving the slide seat to move.

[0007] Preferably, the positioning mechanism includes a first cylinder installed on the outer wall of the processing table and corresponding to the groove, a clamp connected to the telescopic end of the first cylinder, and a guide rail arranged in the groove. The clamp is located in the groove and is slidably connected to the guide rail, and a V-shaped groove is provided on the side of the clamp facing the center of the processing table.

[0008] The above technical solution places the stepper wheel on the processing table, and then controls all the first cylinders to work simultaneously, driving the clamping plate to slide in the groove along the guide rail, thereby clamping the stepper wheel through the clamping plate.

[0009] Preferably, the lifting mechanism includes a screw rod rotatably connected to the frame and vertically, a first guide rod connected to the frame and located on both sides of the screw rod, and a second motor installed on the upper part of the frame. The second motor is transmission-connected to the screw rod, the lifting seat is threadedly connected to the screw rod, and the lifting seat is slidably connected to the first guide rod.

[0010] The above technical solution controls the second motor to work and drives the lead screw to rotate, thereby driving the lifting seat to move up and down along the first guide rod.

[0011] Preferably, the outer wall grinding mechanism includes a second cylinder installed on one of the lifting seats, a third motor connected to the telescopic end of the second cylinder, a first transmission sleeve connected to the third motor through a coupling, and an external grinding block is splined on the first transmission sleeve.

[0012] The above technical solution controls the extension of the second cylinder to drive the third motor to move toward the processing table so that the outer grinding block contacts the step wheel.

[0013] Preferably, the outer wall cleaning mechanism includes a third cylinder installed on another lifting seat, a fourth motor connected to the telescopic end of the third cylinder, a second transmission sleeve connected to the fourth motor through a coupling, and an external cleaning brush is splined on the second transmission sleeve.

[0014] The above technical solution controls the third cylinder to work, which can drive the fourth motor to move toward the processing table so that the outer cleaning brush contacts the tower wheel.

[0015] Preferably, the driving mechanism includes a fifth motor disposed in the second cylinder, a first rotating shaft connected to the fifth motor through a coupling, and a first gear connected to the first rotating shaft, the first rotating shaft is rotatably connected to the second cylinder, the driving mechanism also includes a second rotating shaft rotatably connected to the second cylinder, a second gear connected to the second rotating shaft, the first gear is meshed with the second gear, and cams are connected to the first rotating shaft and the second rotating shaft, which control the two cams to rotate towards each other and push the slide to move toward the outside of the second cylinder.

[0016] According to the above technical solution, after the second cylinder enters the tower wheel, the fifth motor is controlled to make the first rotating shaft and the second rotating shaft rotate towards each other, driving the two cams to rotate towards each other, and the slide is squeezed by the cam to make the slide move toward the outside of the second cylinder. The slide drives the inner grinding block to move outward until the inner grinding block contacts the inner wall of the tower wheel, so that the inner wall of the tower wheel can be polished by the inner grinding block.

[0017] Preferably, the upper and lower ends of the second cylinder are connected to second guide rods, the outer periphery of the second guide rods is provided with a spring, the upper and lower sides of the slide seat are respectively slidably connected to the two second guide rods, one end of the spring rests on the inner wall of the second cylinder away from the opening, and the other end of the spring is connected to the slide seat.

[0018] In the above technical solution, the setting of the second guide rod can improve the stability of the slide during movement, and the reverse rotation of the first rotating shaft and the second rotating shaft can cause the two cams to rotate in reverse. Under the restoring force of the spring, the two slides will move into the second cylinder until they abut against the cam, thereby causing the inner grinding block to move into the second cylinder to adjust the length of the inner grinding block on the outside to adapt to the tower wheel with a smaller inner diameter.

[0019] Preferably, the rotating mechanism includes a sixth motor arranged in the machine base, a transmission shaft connected to the sixth motor, a main gear connected to the transmission shaft, a rotating column connected to the bottom surface of the processing table, and a sub-gear connected to the rotating column, and the main gear is meshed with the sub-gear.

[0020] The above technical solution controls the sixth motor to work, and through the cooperation of the main gear and the auxiliary gear, it can drive the rotating column to rotate, thereby driving the processing table to rotate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) Each wheel disc is polished by an outer wall cleaning mechanism. After polishing, each wheel disc is cleaned by an outer wall cleaning structure, thereby performing surface treatment on wheel discs of different diameters.

[0023] (2) While grinding the outer wall of the step wheel, the inner wall of the step wheel can be grinded by the inner grinding block, so that the inner and outer walls can be grinded at the same time. While grinding, the inner wall of the step wheel can be cleaned by the inner brush, so that cleaning can be achieved while grinding.

[0024] (3) When grinding the inner wall of the step wheel, the driving mechanism drives the slide to move toward the outside of the second cylinder, which can drive the inner grinding block to move outward, so as to grind step wheels with different inner diameters and improve adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the present invention;

[0026] Figure 2 for Figure 1 The main view;

[0027] Figure 3 It is a schematic diagram after the inner grinding block is moved outward from the second cylinder;

[0028] Figure 4 It is a schematic diagram after the inner grinding block moves toward the inner side of the second cylinder;

[0029] Figure 5 is a top sectional view of the second cylinder;

[0030] Figure 6 It is a top view of the processing table;

[0031] Figure 7 It is a schematic diagram of the surface treatment of the step pulley;

[0032] Figure 8 is a schematic diagram of a tower wheel;

[0033] In the figure: 1-base, 2-processing table, 3-groove, 4-frame, 5-lifting seat, 6-hydraulic cylinder, 7-box, 8-first motor, 9-transmission rod, 10-first cylinder, 11-inner brush, 12-second cylinder, 13-opening, 14-slide, 15-inner grinding block, 16-first cylinder, 17-plywood, 18-guide rail, 19-V-groove, 20-screw, 21-first guide rod, 22-second motor Machine, 23-second cylinder, 24-third motor, 25-external grinding block, 26-third cylinder, 27-fourth motor, 28-external cleaning brush, 29-first rotating shaft, 30-first gear, 31-second rotating shaft, 32-second gear, 33-cam, 34-second guide rod, 35-spring, 36-sixth motor, 37-main gear, 38-rotating column, 39-secondary gear, 40-fifth motor, 41-tower wheel. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] See also Figure 1-Figure 7 A step pulley surface treatment device includes a machine base 1, a processing table 2 is arranged at the center of the machine base 1, and a rotating mechanism for driving the processing table to rotate is arranged in the machine base. Specifically, the rotating mechanism includes a sixth motor 36 arranged in the machine base, a transmission shaft connected to the sixth motor, a main gear 37 connected to the transmission shaft, a rotating column 38 connected to the bottom surface of the processing table, and a sub-gear 39 connected to the rotating column, and the main gear 37 is meshed with the sub-gear 39. The sixth motor 36 is controlled to work, and the main gear 37 and the sub-gear 39 cooperate to drive the rotating column 38 to rotate, so as to drive the processing table 2 to rotate.

[0037] The processing table 2 is provided with a plurality of grooves 3 with the center of the processing table as the center of the circle, and each groove 3 is provided with a positioning mechanism for fixing the step wheel at the center of the processing table. Specifically, the positioning mechanism includes a first cylinder 16 installed on the outer wall of the processing table 2 and corresponding to the groove, a clamping plate 17 connected to the telescopic end of the first cylinder, and a guide rail 18 provided in the groove. The clamping plate 17 is located in the groove 3 and is slidably connected to the guide rail 18. A V-shaped groove 19 is provided on the side of the clamping plate 17 facing the center of the processing table. When fixing the step wheel, the step wheel is placed on the processing table 2, and then all the first cylinders 16 are controlled to work at the same time, driving the clamping plate 17 to slide along the guide rail 18 in the groove 3, so that the lower part of the step wheel is clamped by the clamping plate 17. In addition, the telescopic strokes of all the first cylinders 16 are the same, and the first cylinders 16 work at the same time, so that after all the clamping plates 17 contact the step wheel, the step wheel can be in the center position of the processing table 2.

[0038] The machine base 1 is connected to a frame 4 at the periphery of the processing table, and both sides of the frame 4 are provided with lifting mechanisms, and both lifting mechanisms are transmission-connected with lifting seats 5, and the lifting mechanisms can control the lifting seats to move up and down. Specifically, the lifting mechanism includes a screw rod 20 that is rotationally connected to the frame and vertical, a first guide rod 21 that is connected to the frame and located on both sides of the screw rod, and a second motor 22 installed on the upper part of the frame. The second motor 22 is transmission-connected to the screw rod 20, and the lifting seat 5 is threadedly connected to the screw rod 20, and the lifting seat 5 is slidably connected to the first guide rod 21. Controlling the second motor 22 to work and drive the screw rod 20 to rotate can drive the lifting seat 5 to rise and fall along the first guide rod 21.

[0039] An outer wall grinding mechanism is installed on one of the lifting seats 5. By controlling the lifting seat to descend one by one from top to bottom, each wheel disc of the tower wheel can be polished by the outer wall grinding mechanism. An outer wall cleaning mechanism is installed on the other lifting seat 5. By controlling the lifting seat to descend one by one from top to bottom, each wheel disc of the tower wheel can be cleaned by the outer wall cleaning mechanism. It should be noted that a touch display is also required to be provided on one side of the machine base for inputting set values ​​so as to set the number of revolutions of the second motor each time according to the width of the wheel disc, so that the lifting seat moves and descends the same distance each time, and after each descent, the outer wall grinding mechanism and the outer wall cleaning mechanism can be aligned with the corresponding wheel disc.

[0040] Specifically, the outer wall grinding mechanism includes a second cylinder 23 installed on one of the lifting seats 5, a third motor 24 connected to the telescopic end of the second cylinder, and a first transmission sleeve connected to the third motor through a coupling, and the first transmission sleeve is splined with an outer grinding block 25. When the outer wall grinding mechanism is aligned with the corresponding wheel disc, the second cylinder 23 is controlled to extend, which can drive the third motor 24 to move toward the processing table 2, so that the outer grinding block 25 contacts the side wall of the wheel disc, and then the third motor 24 is controlled to work, driving the outer grinding block 25 to rotate, and at the same time, the processing table is driven to rotate through the rotating mechanism, so that the wheel disc can be polished by the outer grinding block.

[0041] The outer wall cleaning mechanism includes a third cylinder 26 installed on another lifting seat 5, a fourth motor 27 connected to the telescopic end of the third cylinder, and a second transmission sleeve connected to the fourth motor through a coupling, and an outer cleaning brush 28 is splined on the second transmission sleeve. The third cylinder is controlled to work, and the fourth motor can be driven to move toward the processing table so that the outer cleaning brush contacts the tower wheel. When the outer wall cleaning mechanism is aligned with the corresponding wheel disc, the third cylinder 26 is controlled to extend, and the fourth motor 27 can be driven to move toward the processing table 2 so that the outer cleaning brush 28 contacts the side wall of the wheel disc, and then the fourth motor 27 is controlled to work, driving the outer cleaning brush 28 to rotate, and at the same time, the processing table 2 is driven to rotate through the rotating mechanism, so that the wheel disc can be cleaned by the outer cleaning brush 28.

[0042] A hydraulic cylinder 6 is fixed at the center of the upper part of the frame 4, and an inner wall grinding and cleaning integrated mechanism is installed at the telescopic end of the hydraulic cylinder 6; by controlling the extension of the hydraulic cylinder 6, the inner wall grinding and cleaning integrated mechanism can be driven to be inserted into the step pulley.

[0043] The inner wall grinding and cleaning integrated mechanism comprises a box body 7, a first motor 8 is installed in the box body 7, a transmission rod 9 is connected to the first motor 8 through a coupling, a first cylinder 10 is connected to the lower end of the transmission rod 9, a plurality of inner brushes 11 are connected to the outer wall of the first cylinder 10, a second cylinder 12 is connected to the lower end of the first cylinder 10, an opening 13 is provided on one side of the second cylinder 12, a slide seat 14 is slidably connected in the opening 13, an inner grinding block 15 is splined on the outer side of the slide seat 14, the outer wall of the inner grinding block 15 is arc-shaped so that the inner grinding block can contact the inner wall of the step wheel, and in actual work, the corresponding inner grinding block 15 can be selected according to the model of the step wheel. A driving mechanism for driving the slide seat 14 to move in the second cylinder is provided in the second cylinder 12, and the inner grinding block 15 can be driven to make a linear motion in the opening by driving the slide seat 14 to move. The driving mechanism includes a fifth motor 40 disposed in the second cylinder, a first rotating shaft 29 connected to the fifth motor through a coupling, and a first gear 30 connected to the first rotating shaft. The first rotating shaft 29 is rotatably connected to the second cylinder 12. The driving mechanism also includes a second rotating shaft 31 rotatably connected to the second cylinder, and a second gear 32 connected to the second rotating shaft. The first gear 30 is meshed with the second gear 32. Cams 33 are also connected to the first rotating shaft 29 and the second rotating shaft 31. The two cams 33 are controlled to rotate towards each other, so as to push the slide 14 to move toward the outside of the second cylinder 12.

[0044] After the second cylinder 12 enters the tower wheel 41, the fifth motor 40 is controlled to drive the first rotating shaft 29 and the second rotating shaft 31 to rotate toward each other through the cooperation of the first gear 30 and the second gear 32, thereby driving the two cams 33 to rotate toward each other, and the slide 14 is pushed by the cam 33 to make the slide 14 move toward the outside of the second cylinder 12, and the slide 14 drives the inner grinding block 15 to move outward until the inner grinding block 15 contacts the inner wall of the tower wheel, and then the first motor 8 is controlled to work and drive the transmission rod 9 to rotate, which can drive the first cylinder 10 and the second cylinder 12 to rotate together, so that the inner wall of the tower wheel is polished by the inner grinding block 15, and the inner wall of the tower wheel is cleaned by the inner brush 11.

[0045] Example 2

[0046] On the basis of Example 1, the upper and lower ends of the second cylinder 12 are connected with second guide rods 34, and the outer periphery of the second guide rods 34 is sleeved with springs 35. The upper and lower sides of the slide 14 are respectively slidably connected to the two second guide rods 34, and one end of the spring 35 abuts against the inner wall of the second cylinder 12 away from the opening, and the other end of the spring 35 is connected to the slide 14. The second guide rods 34 are provided to improve the stability of the slide 14 during movement. The first rotating shaft 29 and the second rotating shaft 31 rotate in opposite directions, so that the two cams 33 can rotate in opposite directions. Under the restoring force of the springs 35, the two slides 14 will move into the second cylinder 12 until they abut against the cams 33, so that the inner grinding block 15 moves into the second cylinder 12 to adjust the length of the inner grinding block 15 on the outside to adapt to the step wheel with a smaller inner diameter.

[0047] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A step pulley surface treatment device, characterized in that: The machine base (1) comprises a machine base (1), a processing table (2) is provided at the center of the machine base (1), a rotating mechanism for driving the processing table to rotate is provided in the machine base, a plurality of grooves (3) with the center of the processing table as the center of the circle are provided on the processing table (2), and a positioning mechanism for fixing the tower wheel at the center of the processing table is provided in each groove (3), a frame (4) is connected to the machine base (1) at the periphery of the processing table, lifting mechanisms are provided on both sides of the frame (4), and lifting seats (5) are connected to the two lifting mechanisms in a driving manner, an outer wall grinding mechanism is installed on one of the lifting seats (5), and each wheel disc of the tower wheel can be ground by the outer wall grinding mechanism, and an outer wall cleaning mechanism is installed on the other lifting seat (5), and each wheel disc of the tower wheel can be cleaned by the outer wall cleaning mechanism; A hydraulic cylinder (6) is fixed at the center of the upper part of the frame (4), and an integrated mechanism for inner wall grinding and cleaning is installed at the telescopic end of the hydraulic cylinder (6); The inner wall grinding and cleaning integrated mechanism comprises a box body (7), a first motor (8) is installed in the box body (7), a transmission rod (9) is connected to the first motor (8) through a coupling, the lower end of the transmission rod (9) is connected to a first cylinder (10), the outer wall of the first cylinder (10) is connected to a plurality of inner brushes (11), the lower end of the first cylinder (10) is connected to a second cylinder (12), one side of the second cylinder (12) is provided with an opening (13), a slide seat (14) is slidably connected in the opening (13), an inner grinding block (15) is splined on the outer side of the slide seat (14), the outer wall of the inner grinding block (15) is arc-shaped, and a driving mechanism for driving the slide seat (14) to move in the second cylinder is provided in the second cylinder (12), and the inner grinding block (15) can be driven to make a linear motion in the opening by driving the slide seat (14) to move.

2. A step pulley surface treatment device according to claim 1, characterized in that: The positioning mechanism comprises a first cylinder (16) mounted on the outer wall of the processing table (2) and corresponding to the groove, a clamping plate (17) connected to the telescopic end of the first cylinder, and a guide rail (18) arranged in the groove. The clamping plate (17) is located in the groove (3) and is slidably connected to the guide rail (18). A V-shaped groove (19) is provided on one side of the clamping plate (17) facing the center of the processing table.

3. A step pulley surface treatment device according to claim 2, characterized in that: The lifting mechanism comprises a screw rod (20) rotatably connected to a frame and vertically, a first guide rod (21) connected to the frame and located on both sides of the screw rod, and a second motor (22) installed on the upper part of the frame, the second motor (22) is transmission-connected to the screw rod (20), the lifting seat (5) is threadedly connected to the screw rod (20), and the lifting seat (5) is slidably connected to the first guide rod (21).

4. A step pulley surface treatment device according to claim 3, characterized in that: The outer wall grinding mechanism comprises a second cylinder (23) mounted on one of the lifting seats (5), a third motor (24) connected to the telescopic end of the second cylinder, and a first transmission sleeve connected to the third motor via a coupling, wherein an outer grinding block (25) is spline-connected to the first transmission sleeve.

5. A step pulley surface treatment device according to claim 4, characterized in that: The outer wall cleaning mechanism comprises a third cylinder (26) mounted on another lifting seat (5), a fourth motor (27) connected to the telescopic end of the third cylinder, and a second transmission sleeve connected to the fourth motor via a coupling, wherein an outer cleaning brush (28) is spline-connected to the second transmission sleeve.

6. A step pulley surface treatment device according to claim 5, characterized in that: The driving mechanism comprises a fifth motor (40) arranged in the second cylinder, a first rotating shaft (29) connected to the fifth motor through a coupling, and a first gear (30) connected to the first rotating shaft, wherein the first rotating shaft (29) is rotationally connected to the second cylinder (12), and the driving mechanism also comprises a second rotating shaft (31) rotationally connected to the second cylinder, and a second gear (32) connected to the second rotating shaft, wherein the first gear (30) is meshed with the second gear (32), and the first rotating shaft (29) and the second rotating shaft (31) are further connected with cams (33), and the two cams (33) are controlled to rotate towards each other, so as to push the slide seat (14) to move toward the outside of the second cylinder (12).

7. A step pulley surface treatment device according to claim 6, characterized in that: The upper and lower ends of the second cylinder (12) are connected to second guide rods (34), and a spring (35) is sleeved on the outer periphery of the second guide rods (34). The upper and lower sides of the slide seat (14) are respectively slidably connected to the two second guide rods (34), one end of the spring (35) abuts against the inner wall of the second cylinder (12) away from the opening, and the other end of the spring (35) is connected to the slide seat (14).

8. The step pulley surface treatment device according to claim 7, characterized in that: The rotating mechanism comprises a sixth motor (36) arranged in the machine base, a transmission shaft connected to the sixth motor, a main gear (37) connected to the transmission shaft, a rotating column (38) connected to the bottom surface of the processing table, and a sub-gear (39) connected to the rotating column, wherein the main gear (37) is meshed with the sub-gear (39).

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