Automobile headrest screw grabbing robot

Abstract

The invention relates to the technical field of robots for automobile headrest production, in particular to an automobile headrest screw grabbing robot which comprises an operation table, a fixing frame is arranged on the operation table, a screw feeder is arranged in front of the fixing frame, and a material placing assembly is arranged in front of the screw feeder. The screw feeder is fixedly installed at the top end of the operation table, a translation plate is arranged over the screw feeder, two sliding rails are arranged at the bottom end of the translation plate, a U-shaped frame is fixedly installed at the top end of the translation plate, a drag chain is arranged in the U-shaped frame, and one end of the drag chain is connected with a screw screwing assembly. According to the screw feeder, the four transmission shafts are movably installed on the rotating ring, the screwdriver blades are installed at the bottom ends of the transmission shafts, the four screwdriver blades can take screws from the screw feeder at the same time, and the situation that the screws need to be taken again after screwing of one screw is completed is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of robots for automobile headrest production, in particular to an automobile headrest screw grasping robot. Background Art

[0002] As a product that can provide additional support, car headrests can help drivers relieve neck fatigue and can buffer the pressure from the acceleration or deceleration of the vehicle when a vehicle collides, ensuring that the driver's head and neck will not suffer serious injuries. During the production process of car headrests, it is often necessary to use a screw grasping robot to grasp the screws and screw them into the screw holes on the car headrest to assemble the various parts of the car headrest together.

[0003] Some existing screw grabbing robots can only install one screw at a time when installing screws on car headrests, and return to the screw supply point to reassemble the screws after the installation is completed. The work efficiency is relatively low and needs to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide a car headrest screw grasping robot to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A car headrest screw grabbing robot comprises an operating table, a fixing frame is arranged on the operating table, a screw feeder is arranged in front of the fixing frame, a material placing assembly is arranged in front of the screw feeder, and the screw feeder is fixedly installed on the top of the operating table, a translation plate is arranged directly above the screw feeder, two slide rails are arranged at the bottom end of the translation plate, a U-shaped frame is fixedly installed on the top of the translation plate, a drag chain is arranged in the U-shaped frame, and a screw tightening assembly is connected to one end of the drag chain.

[0007] The material placement assembly comprises two vertical mounting blocks, a rotating motor is arranged between the two vertical mounting blocks, and a material placement platform is arranged on the outer wall of the output shaft of the rotating motor.

[0008] The screw assembly includes a vertical plate, a fixed frame is provided on the front end surface of the vertical plate, a rotating screw is provided in the fixed frame, a lifting block is movably mounted on the outer wall of the rotating screw, a groove is provided on the front end surface of the lifting block, and a second rotating motor is provided in the groove, a sleeve ring is connected to the outer wall of the output shaft of the second rotating motor, and the sleeve ring is fixedly sleeved on the outer wall of the electric push rod, a stabilizing platform is provided at the bottom end of the electric push rod, a third rotating motor is provided at the bottom end of the stabilizing platform, a rotating shaft is connected to the bottom end of the output shaft of the third rotating motor, a mounting platform is movably mounted on the outer wall of the rotating shaft, a telescopic connecting rod is provided between the top end of the mounting platform and the bottom end of the stabilizing platform, and the telescopic connecting rod is connected to the stabilizing platform and the mounting platform through a rotating shaft.

[0009] A mounting rod is installed at the bottom end of the mounting platform, and a rotating motor is arranged at the bottom end of the mounting rod. A connecting plate is connected to the outer wall of the output shaft of the rotating motor, and a rotating ring is connected to the outer wall of the connecting plate. A fixing ring is arranged on the periphery of the rotating ring, and the top end of the fixing ring is connected to the bottom end of the mounting platform by two connecting columns. Four through holes are arranged on the rotating ring, and transmission shafts are arranged in the four through holes, and screwdriver heads are arranged at the bottom ends of the four transmission shafts.

[0010] A clamping block is provided at the top of the transmission shaft, a ring is movably mounted on the outer wall of the transmission shaft, two limit blocks are fixedly connected to the outer wall of the ring, a positioning frame is movably fitted on the outer wall of the limit block, and the positioning frame is fixedly installed on the top of the rotating ring, a movable ring is movably mounted on the outer wall of the transmission shaft, a limiting plug rod is provided on the top of the movable ring, and a vertical mounting plate is provided at the bottom of the movable ring.

[0011] A mounting plate is fixedly connected to the outer wall of the fixing ring, a horizontal plate is arranged on the side wall of the mounting plate, a triangular mounting plate is arranged at the bottom end of the horizontal plate, an L-shaped fixing platform is arranged at the bottom end of the mounting plate, two protrusions are arranged at the top end of the L-shaped fixing platform, and an arc plate is arranged between the two protrusions.

[0012] The bottom end of the rotating ring is provided with four lifting grooves, and the diameter of the lifting grooves is the same as the diameter of the limiting rods, and the top ends of the limiting rods extend into the lifting grooves at the bottom end of the rotating ring.

[0013] A clamping slot is arranged at the bottom end of the rotating shaft, and the length, width and height dimensions of the clamping slot are the same as those of the clamping block.

[0014] The telescopic connecting rod is composed of a column and a telescopic column. The column is a hollow cylinder, and an opening is provided at the bottom end of the column. The top end of the telescopic column extends into the inner cavity of the column through the opening at the bottom end of the column. A plurality of arc-shaped grooves are vertically provided on the inner wall of the column, and two spring plungers matching the arc-shaped grooves are provided on the outer wall of the telescopic column.

[0015] A circular slide groove is arranged on the inner wall of the sleeve ring, and two sliding blocks are slidably installed in the circular slide groove, and the sliding blocks are fixedly connected to the outer wall of the transmission shaft.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention movably mounts four transmission shafts on a rotating ring and mounts screwdriver heads on the bottom ends of the transmission shafts, so that the four screwdriver heads can simultaneously pick up screws from a screw feeder, thereby avoiding the need to pick up screws again after completing the screwing of one screw.

[0018] The vertical mounting plate contacts the highest point of the arc plate in the process of following the rotation of the rotating ring, so that the transmission shaft can automatically dock with the bottom end of the rotating shaft, and the clamping block at the top of the transmission shaft is inserted into the clamping groove at the bottom end of the rotating shaft, and the automatic loading facilitates the screwing and installation.

[0019] The slider in the circular groove on the inner wall of the movable ring is connected to the transmission shaft, so that when the vertical mounting plate at the bottom end of the movable ring contacts the arc plate, the transmission shaft can be driven upward synchronously, and when the hydraulic push rod pushes the triangular mounting plate downward and drives the movable ring to move downward, the transmission shaft can be driven downward to disengage from the connection with the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the material placing component of the present invention.

[0022] Figure 3 It is a schematic diagram of the structure of the screw assembly of the present invention.

[0023] Figure 4 It is a schematic diagram of the local structure of the screw assembly of the present invention.

[0024] Figure 5 For the present invention Figure 3 A magnified view of the structure in the middle.

[0025] Figure 6 It is a schematic diagram of the structure of the stabilizing platform of the present invention.

[0026] Figure 7 For the present invention Figure 6 Enlarged view of the structure at point B in the middle.

[0027] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point C in the middle.

[0028] Fig. 9 For the present invention Figure 7Enlarged schematic diagram of the structure at point D in the middle.

[0029] Fig.10 It is a schematic diagram of the mounting plate structure of the present invention.

[0030] In the figure: 1. operating table; 2. fixing frame; 3. slide rail; 4. translation plate; 5. U-shaped frame; 6. drag chain; 7. screw assembly; 8. material placement assembly; 9. screw feeder; 10. telescopic connecting rod; 11. vertical assembly block; 12. rotating motor; 13. material placement table; 14. vertical plate; 15. fixing frame; 16. rotating screw; 17. lifting block; 18. second rotating motor; 19. set ring; 20. electric push rod; 21. stabilizing table; 22. third rotating motor; 2 3. Rotating shaft; 24. Mounting platform; 25. Mounting rod; 26. Rotating motor; 27. Connecting plate; 28. Rotating ring; 29. ​​Fixed ring; 30. Connecting column; 31. Transmission shaft; 32. Block; 33. Ring; 34. Limit block; 35. Positioning frame; 36. Movable ring; 37. Screwdriver head; 38. Vertical mounting plate; 39. Mounting plate; 40. Horizontal plate; 41. Triangular mounting plate; 42. L-shaped fixing platform; 43. Boss; 44. Arc plate; 45. Limiting rod. DETAILED DESCRIPTION

[0031] 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.

[0032] See also Figures 1 to 10 The present invention provides a technical solution: a car headrest screw grasping robot, such as Figure 1As shown in, it includes an operating table 1, a fixing frame 2 is fixedly installed on the top of the operating table 1, a screw feeder 9 is arranged in front of the fixing frame 2, the screw feeder 9 adopts the Jianfeng turntable screw feeder JF-818LMJ in the prior art, a material placement component 8 is arranged in front of the screw feeder 9, and the screw feeder 9 is fixedly installed on the top of the operating table 1, and four material placement grooves are arranged on the material transfer disk which is one of the components of the screw feeder 9, so that four screws can be conveniently placed in the four material placement grooves on the material transfer disk, and the diameter of the material transfer disk is the same as the diameter of the rotating ring 28, so that the four screwdriver heads 37 on the rotating ring 28 can be connected with the four screws on the material transfer disk which is one of the components of the screw feeder 9, a translation plate 4 is arranged directly above the screw feeder 9, and the bottom end of the translation plate 4 is arranged There are two slide rails 3, which adopt ball linear guides in the prior art, and the slider, which is one of the components of the ball linear guide, is fixedly connected to the translation plate 4, so that the translation plate 4 can be pushed for translational movement through the slide rails 3. A U-shaped frame 5 is fixedly installed on the top of the translation plate 4, and a groove is provided on the front end surface of the U-shaped frame 5, and a ball linear guide is provided in the groove. The slider on the ball linear guide is connected to a screw assembly 7, and a drag chain 6 is provided in the U-shaped frame 5. One end of the drag chain 6 is connected to the screw assembly 7. The drag chain 6 can provide protection for the ball linear guide on the U-shaped frame 5 and the lines on the screw assembly 7. A control main board is provided on the operating table 1, and the control main board is connected to the electrical appliances on the operating table 1 through lines, and a working program is set so that the equipment on the operating table 1 can be used smoothly.

[0033] See also Figure 2 The material placement component 8 includes two vertical mounting blocks 11, the bottom ends of the two vertical mounting blocks 11 are fixedly connected to the operating table 1, and a rotating motor 12 is arranged between the two vertical mounting blocks 11. The right side of the rotating motor 12 passes through a vertical mounting block 11 and extends to the right side of the vertical mounting block 11, and a material placement table 13 is fixedly connected to the outer wall of the output shaft of the rotating motor 12. The material placement table 13 is driven to rotate by the rotating motor 12, which can facilitate the screwing and installation of automobile headrest screws that require different installation angles.

[0034] See also Figure 3-Figure 10The screw assembly 7 includes a vertical plate 14, the back surface of the vertical plate 14 is connected to a slider of a ball linear guide structure in the groove of the front end surface of the U-shaped frame 5, and the front end surface of the vertical plate 14 is provided with a fixed frame 15, and a through hole is provided on the top side wall of the fixed frame 15, and a motor is installed in the through hole, and the bottom end of the output shaft of the motor faces downward and is connected to a rotating screw 16, and the bottom end of the rotating screw 16 is rotatably connected to the inner wall of the bottom end of the fixed frame 15, and a lifting block 17 is movably sleeved on the outer wall of the rotating screw 16, and the length and width of the lifting block 17 are the same as those of the fixed frame 1 The length and width of the inner wall of the lifting block 17 are the same. The motor drives the rotating screw 16 to rotate, so that the lifting block 17 can move vertically up and down in the fixed frame 15. The front end surface of the lifting block 17 is provided with a groove, and a second rotating motor 18 is installed in the groove. A sleeve ring 19 is fixedly connected to the outer wall of the output shaft of the second rotating motor 18. An electric push rod 20 is fixedly installed on the sleeve ring 19. The bottom end of the electric push rod 20 is fixedly connected to a stabilizing platform 21. The bottom end of the stabilizing platform 21 is provided with a third rotating motor 22. The bottom end of the output shaft of the third rotating motor 22 is connected to The rotating shaft 23 has a mounting platform 24 movably mounted on its outer wall. A telescopic connecting rod 10 is arranged between the top of the mounting platform 24 and the bottom of the stabilizing platform 21. The telescopic connecting rod 10 is connected to the stabilizing platform 21 and the mounting platform 24 through a rotating shaft. The telescopic connecting rod 10 is composed of a column and a telescopic column. The column is a hollow column, and an opening is arranged at the bottom of the column. The top of the telescopic column extends into the inner cavity of the column through the opening at the bottom of the column. A plurality of arc grooves are vertically arranged on the inner wall of the column, and two arc grooves are arranged on the outer wall of the telescopic column. The spring plunger matching the arc groove can be inserted into arc grooves of different heights by the spring plunger, so that the position of the telescopic column can be fixed, and the angle of the rotating shaft 23 can be adjusted during the rotation of the second rotating motor 18. After the adjustment is completed, it is avoided that the mounting platform 24 is only mounted on the outer wall of the rotating shaft 23 and is prone to self-rotation due to the lack of fixation. In addition, the rotating motor 12 and the second rotating motor 18 are both equipped with a frequency converter, so that the angle of the rotating motor 12 and the second rotating motor 18 after rotation can be locked during use.

[0035] A mounting rod 25 is installed at the bottom end of the mounting platform 24, and a rotating motor 26 is arranged at the bottom end of the mounting rod 25. A connecting plate 27 is connected to the outer wall of the output shaft of the rotating motor 26, and a rotating ring 28 is connected to the outer wall of the connecting plate 27. A fixing ring 29 is movably fitted on the outer wall of the rotating ring 28, and two connecting columns 30 are fixedly installed on the top of the fixing ring 29. The top ends of the two connecting columns 30 are fixedly connected to the bottom end of the mounting platform 24. Four through holes are arranged on the rotating ring 28, and transmission shafts 31 are arranged in the four through holes. A screwdriver head 37 is installed at the bottom end of the transmission shaft 31. The inside of the cutter head 37 is hollow, and a magnet is installed in the screwdriver head 37, and a block 32 is provided at the top of the transmission shaft 31, and a slot is provided at the bottom of the rotating shaft 23, and the length, width and height of the slot are the same as the length, width and height of the block 32. A collar 33 is movably sleeved on the outer wall of the transmission shaft 31, and a circular groove is provided on the inner wall of the collar 33, and two sliders are slidably installed in the circular groove, and the sliders are fixedly connected to the outer wall of the transmission shaft 31, so as to prevent the transmission shaft 31 from driving the collar 33 to rotate in the process of following the rotation of the rotating shaft 23, and the collar 33 can follow the transmission shaft 31. The movable shaft 31 moves vertically up and down, and two limit blocks 34 are fixedly connected to the outer wall of the collar 33. The outer walls of the limit blocks 34 are movably fitted with positioning frames 35. The positioning frames 35 are fixedly installed on the top of the rotating ring 28. The top of the rotating ring 28 is provided with eight hidden grooves. The limit blocks 34 can be put into the hidden grooves during the lifting and lowering movement of the collar 33 to prevent the limit blocks 34 from affecting the lifting and lowering movement of the collar 33. A movable ring 36 is provided on the outer wall of the transmission shaft 31. A circular slide groove is provided on the outer wall of the movable ring 36. A slider is slidably installed in the circular slide groove. The sliders are fixedly connected On the outer wall of the transmission shaft 31, the transmission shaft 31 can drive the movable ring 36 to move up and down during the lifting and lowering movement and prevent the transmission shaft 31 from driving the movable ring 36 to rotate during the rotation process. Four lifting grooves are set at the bottom end of the rotating ring 28, and the diameter size of the lifting grooves is the same as the diameter size of the limiting rod 45. The top ends of the limiting rods 45 are all extended into the lifting grooves at the bottom end of the rotating ring 28, and the inner walls of the top ends of the lifting grooves are connected to the limiting rods 45 through connecting springs. The limiting rods 45 are set at the top end of the movable ring 36, and the bottom end of the movable ring 36 is provided with a vertical mounting plate 38.

[0036] A mounting plate 39 is fixedly connected to the outer wall of the fixed ring 29, a horizontal plate 40 is arranged on the side wall of the mounting plate 39, a hydraulic push rod is installed on the bottom plate of the horizontal plate 40, the bottom end of the hydraulic push rod is connected to a triangular mounting plate 41, an L-shaped fixing platform 42 is arranged at the bottom end of the mounting plate 39, two protrusions 43 are arranged on the top of the L-shaped fixing platform 42, an arc plate 44 is arranged between the two protrusions 43, and the arc plate 44 and the triangular mounting plate 41 are both located in the movable range of rotation of the movable ring 36 on the rotating ring 28.

[0037] When the rotating motor 26 is rotating, the rotating ring 28 is rotated. When the rotating ring 28 is rotating, it drives the four transmission shafts 31 to make circular motion at the same time. When the four transmission shafts 31 are moving, a vertical mounting plate 38 contacts the arc plate 44. When the vertical mounting plate 38 moves to the highest point on the arc plate 44, it drives the movable ring 36 and the transmission shaft 31 to move upward, so that the block 32 at the top of the transmission shaft 31 is inserted into the slot at the bottom of the rotating shaft 23, so that the transmission shaft 31 and the screwdriver head 37 can be driven to rotate during the rotation of the rotating shaft 23 to screw on the car headrest. At this time, the triangular mounting plate 41 is located at the top of the movable ring 36, and the triangular mounting plate 41 can be pushed downward by the hydraulic push rod, so that the triangular mounting plate 41 pushes the movable ring 36 to move downward, so that the block 32 is pulled out of the slot, which is convenient for replacing the next screwdriver head 37.

[0038] When the present invention is in use, the electrical appliances on the operating table 1 are first started by an external power supply, the car headrest is placed on the top of the material placement table 13, and through the cooperation of the slide rail 3, the four screwdriver heads 37 below the rotating ring 28 each take a screw from the screw feeder 9, and the rotating motor 26 is rotated so that the vertical mounting plate 38 at the bottom end of a movable ring 36 can contact the highest point of the arc plate 44. At this time, the top clamping block 32 of the transmission shaft 31 on the movable ring 36 will be inserted into the bottom clamping groove of the rotating shaft 23, and the rotating shaft 23, the transmission shaft 31, and the screwdriver head 37 can be rotated by the third rotating motor 22 to rotate and install the screw. After the installation is completed, the triangular mounting plate 41 is pushed downward by the hydraulic push rod to pull the clamping block 32 out of the clamping groove, and the next screwdriver head 37 can be replaced for use.

[0039] 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 car headrest screw grabbing robot, comprising an operating table (1), characterized in that: The operating table (1) is provided with a fixed frame (2), a screw feeder (9) is provided in front of the fixed frame (2), a material placing assembly (8) is provided in front of the screw feeder (9), and the screw feeder (9) is fixedly mounted on the top of the operating table (1), a translation plate (4) is provided directly above the screw feeder (9), two slide rails (3) are provided at the bottom of the translation plate (4), a U-shaped frame (5) is fixedly mounted on the top of the translation plate (4), a drag chain (6) is provided inside the U-shaped frame (5), and one end of the drag chain (6) is connected to a screw screwing assembly (7).

2. The automobile headrest screw grabbing robot according to claim 1, characterized in that: The material placement assembly (8) comprises two vertical blocks (11), a rotating motor (12) is arranged between the two vertical blocks (11), and a material placement platform (13) is arranged on the outer wall of the output shaft of the rotating motor (12).

3. The automobile headrest screw grabbing robot according to claim 1, characterized in that: The screw assembly (7) comprises a vertical plate (14), a fixed frame (15) is arranged on the front end surface of the vertical plate (14), a rotating screw (16) is arranged in the fixed frame (15), a lifting block (17) is movably sleeved on the outer wall of the rotating screw (16), a groove is arranged on the front end surface of the lifting block (17), and a second rotating motor (18) is arranged in the groove, a sleeve ring (19) is connected to the outer wall of the output shaft of the second rotating motor (18), and the sleeve ring (19) is fixedly sleeved on the outer wall of the electric push rod (20) The electric push rod (20) is provided with a stabilizing platform (21) at the bottom end, a third rotating motor (22) is provided at the bottom end of the stabilizing platform (21), a rotating shaft (23) is connected to the bottom end of the output shaft of the third rotating motor (22), a mounting platform (24) is movably mounted on the outer wall of the rotating shaft (23), a telescopic connecting rod (10) is provided between the top end of the mounting platform (24) and the bottom end of the stabilizing platform (21), and the telescopic connecting rod (10) is connected to the stabilizing platform (21) and the mounting platform (24) through a rotating shaft.

4. The automobile headrest screw grabbing robot according to claim 3, characterized in that: A mounting rod (25) is mounted at the bottom end of the mounting platform (24), a rotating motor (26) is arranged at the bottom end of the mounting rod (25), a connecting plate (27) is connected to the outer wall of the output shaft of the rotating motor (26), a rotating ring (28) is connected to the outer wall of the connecting plate (27), a fixing ring (29) is arranged on the periphery of the rotating ring (28), and the top end of the fixing ring (29) is connected to the bottom end of the mounting platform (24) via two connecting columns (30), four through holes are arranged on the rotating ring (28), transmission shafts (31) are arranged in the four through holes, and screwdriver heads (37) are arranged at the bottom ends of the four transmission shafts (31).

5. The automobile headrest screw grabbing robot according to claim 4, characterized in that: A clamping block (32) is provided at the top of the transmission shaft (31); a collar (33) is movably mounted on the outer wall of the transmission shaft (31); two limit blocks (34) are fixedly connected to the outer wall of the collar (33); a positioning frame (35) is movably fitted on the outer wall of the limit blocks (34); and the positioning frame (35) is fixedly mounted on the top of the rotating ring (28); a movable ring (36) is movably mounted on the outer wall of the transmission shaft (31); a limit rod (45) is provided at the top of the movable ring (36); and a vertical mounting plate (38) is provided at the bottom of the movable ring (36).

6. The automobile headrest screw grabbing robot according to claim 4, characterized in that: A mounting plate (39) is fixedly connected to the outer wall of the fixing ring (29), a transverse plate (40) is arranged on the side wall of the mounting plate (39), a triangular mounting plate (41) is arranged at the bottom end of the transverse plate (40), an L-shaped fixing platform (42) is arranged at the bottom end of the mounting plate (39), two protrusions (43) are arranged at the top end of the L-shaped fixing platform (42), and an arc-shaped plate (44) is arranged between the two protrusions (43).

7. The automobile headrest screw grabbing robot according to claim 4, characterized in that: The bottom end of the rotating ring (28) is provided with four lifting grooves, and the diameter of the lifting grooves is the same as the diameter of the limiting rod (45), and the top ends of the limiting rods (45) extend into the lifting grooves at the bottom end of the rotating ring (28).

8. The automobile headrest screw grabbing robot according to claim 4, characterized in that: A clamping slot is provided at the bottom end of the rotating shaft (23), and the length, width and height dimensions of the clamping slot are the same as those of the clamping block (32).

9. The automobile headrest screw grabbing robot according to claim 3, characterized in that: The telescopic connecting rod (10) is composed of a column and a telescopic column. The column is a hollow column, and an opening is arranged at the bottom end of the column. The top end of the telescopic column extends into the inner cavity of the column through the opening at the bottom end of the column. A plurality of arc-shaped grooves are vertically arranged on the inner wall of the column, and two spring plungers matching the arc-shaped grooves are arranged on the outer wall of the telescopic column.

10. The automobile headrest screw grabbing robot according to claim 5, characterized in that: A circular slide groove is provided on the inner wall of the collar (33), and two sliding blocks are slidably mounted in the circular slide groove, and the sliding blocks are fixedly connected to the outer wall of the transmission shaft (31).

Images