Bottom support device of numerical control equipment

Abstract

The present invention relates to the field of equipment support, and in particular to a bottom support device for numerical control equipment, comprising a support seat, a guide housing seat is slidably mounted in the middle of the lower end of the support seat, a cleaning brush plate is fixedly mounted at the lower edge of the rear end of the guide housing seat, a brush cylinder shaft is rotatably mounted at the lower inner part of the guide housing seat, both ends of the brush cylinder shaft penetrate from both sides of the guide housing seat, both ends of the brush cylinder shaft are coaxially fixedly mounted with a cleaning brush cylinder, a pusher is mounted at the lower end of the support seat, the pusher is connected to the guide housing seat, and self-locking parts are mounted at the edges of both sides of the upper end of the support seat. The present invention reduces the labor intensity of workers, facilitates cleaning, ensures the cleaning effect, and improves the convenience of use.

Description

Technical Field

[0001] The invention relates to the field of equipment support, and in particular to a bottom support device for numerical control equipment. Background Art

[0002] CNC equipment refers to equipment that uses this technology. CNC technology is also called computer numerical control technology. At present, it is a technology that uses computers to realize digital program control. This technology uses computers to execute the motion trajectory of the equipment and the operation timing logic control function of peripherals according to the control program stored in advance.

[0003] During the use of some CNC equipment such as CNC sawing machines, there are often a lot of debris on the industrial floor below the equipment. At this time, in order to ensure the cleanliness of the industrial environment, it is generally necessary to clean it regularly. However, when the equipment is supported by its own feet, the bottom of the equipment is close to the ground, which is not conducive to the entry of cleaning facilities for cleaning. Therefore, in order to avoid this phenomenon, a support device is generally installed at the bottom of the equipment for support. In the actual installation process, after the equipment is placed on the support device, workers are required to additionally fix the two. The operation process is quite cumbersome, resulting in inconvenience in use. Although the equipment is supported by a support device, the height of the bottom of the equipment from the ground is still limited. At this time, workers are required to lie on the ground to extend the cleaning equipment under the equipment for cleaning. The process increases the labor intensity of the workers and is inconvenient to clean. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a bottom support device for numerical control equipment.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a bottom support device for CNC equipment, comprising a support seat, a guide shell seat is slidably installed in the middle of the lower end of the support seat, a cleaning brush plate is fixedly installed at the lower edge of the rear end of the guide shell seat, a brush cylinder shaft is rotatably installed on the inner lower part of the guide shell seat, both ends of the brush cylinder shaft pass through the two sides of the guide shell seat, and cleaning brush cylinders are coaxially fixedly installed on both ends of the brush cylinder shaft, a pushing member is installed at the lower end of the support seat, the pushing member is connected to the guide shell seat, and self-locking members are installed at the edges of both sides of the upper end of the support seat.

[0006] Preferably, a guide tooth plate is fixedly installed in the middle part of the lower end of the support seat, guide grooves are opened on both sides of the guide tooth plate, the upper end part of the guide shell seat is slidably installed inside the guide groove, and a gear shaft is rotatably installed in the middle part of the inner side of the guide shell seat, and the outer surface of the brush cylinder shaft and the outer surface of the gear shaft are coaxially inlaid with connecting gears, the two connecting gears are meshed with each other, and the connecting gear on the gear shaft is meshed with the guide tooth plate.

[0007] Preferably, the pushing member includes a threaded rod arranged at the lower end of the support seat, the threaded rod is located on the side of the guide tooth plate, a threaded sleeve is screwed on the outer surface of the threaded rod, the side of the threaded sleeve is fixed to the upper part of the side of the guide shell seat, and a servo motor is installed at the rear end of the support seat, and the output end of the servo motor is fixed to the threaded rod.

[0008] Preferably, a motor frame is fixedly mounted on the side of the servo motor, the end of the motor frame is fixed to the support seat, both ends of the threaded rod are rotatably mounted with a fixed rod seat, and the upper end of the fixed rod seat is fixed to the support seat.

[0009] Preferably, the self-locking part includes a bearing sleeve which is penetrated and embedded in the middle of the edges on both sides of the upper end of the support seat, and a reset top column is coaxially installed on the upper end of the bearing sleeve. The reset top column extends into the interior of the bearing sleeve, and the reset top column slides with the bearing sleeve. A guide sleeve is fixedly installed on the upper end of the reset top column, and two protruding columns are symmetrically installed inside the guide sleeve. The two protruding columns respectively penetrate from the two ends of the guide sleeve, and two limit slot blocks are symmetrically fixedly installed on the ends of the two protruding columns.

[0010] Preferably, the edges of the opposite surfaces of the limiting slot blocks on the two extending columns are inclined, and the opposite surfaces of the limiting slot blocks on the two extending columns are fixedly installed with L-shaped corner blocks, and the ends of the L-shaped corner blocks are arranged in an arc surface. An extending seat is extended from the upper end of the guide sleeve, and the extending seat is integrally formed with the guide sleeve. An extending frame is connected between the extending column and the supporting sleeve, and the extending frame is inclined.

[0011] Preferably, a limiting cap is coaxially fixedly installed on the lower end of the reset top column, and the limiting cap fits inside the bearing sleeve. A reset spring is fixedly installed on the lower end of the limiting cap, and the end of the reset spring is fixed to the inner bottom surface of the bearing sleeve. An upper connecting ear is extended near the edge of the lower end of the extending column, and two through grooves are symmetrically provided on the lower end surface of the guide sleeve. The upper connecting ear extends from the inside of the through groove, and two lower connecting ears are symmetrically extended from the outer surface of the bearing sleeve, and the lower connecting ear and the upper connecting ear are respectively located in the two ends of the extending frame, and both ends of the extending frame are penetrated and rotatably installed with connecting shafts, and the two connecting shafts are respectively penetrated and embedded in the interior of the lower connecting ear and the interior of the upper connecting ear.

[0012] Preferably, a fixing shell is fixedly installed at the upper edge of the side of the bearing sleeve, and a locking column is coaxially arranged inside the fixing shell, two ends of the locking column pass through the two sides of the fixing shell, the locking column and the fixing shell are slidably matched, the locking column passes through the side of the bearing sleeve, and a locking hole is opened on the side of the reset top column, one end of the locking column fits inside the locking hole, and a pulling ring is fixedly installed on the other end of the locking column, and a top ring is coaxially inlaid on the outer surface of the locking column, and the top ring fits inside the inner surface of the fixing shell, and a tightening spring is wound around the outer side of the locking column, and the two ends of the tightening spring are respectively fixed to the side of the top ring and the inner side of the fixing shell.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The threaded rod driven by the servo motor to rotate can drive the threaded sleeve to move, and then drive the guide shell seat to slide on the guide tooth plate, so as to drive the cleaning brush barrel and the cleaning brush plate on the guide shell seat to move, so as to repeatedly clean the debris on the industrial floor under the equipment and push it out of the equipment. The process does not require manual cleaning by workers, which effectively reduces the labor intensity of workers and facilitates cleaning. At the same time, when the guide shell seat is moving, the connecting gear in the guide shell seat will roll on the guide tooth plate, thereby driving the cleaning brush barrel on the brush barrel shaft to rotate, so as to increase the cleaning force of the industrial floor, thereby ensuring its cleaning effect.

[0015] The support leg at the bottom of the equipment body is pressed against the support seat, and the locking post in the fixed shell is pushed out by the locking spring and enters the locking hole on the reset post to lock and fix the support sleeve and the reset post, so as to limit the upper and lower positions of the equipment body. When the equipment body is placed on the support seat, the fixation between the two can be completed by itself, and the workers do not need to perform additional fixing operations, thereby effectively improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a bottom support device of a numerical control device of the present invention;

[0017] Figure 2A schematic diagram of a servo motor of a bottom support device of a numerical control device according to the present invention;

[0018] Figure 3 It is an internal view of a guide housing seat of a bottom support device of a numerical control device of the present invention;

[0019] Figure 4 The present invention is a bottom support device of a numerical control equipment Figure 1 A magnified view of middle;

[0020] Figure 5 It is an internal view of a bearing sleeve of a bottom support device of a numerical control device of the present invention;

[0021] Figure 6 This is a support view of a bottom support device of a numerical control device of the present invention;

[0022] Figure 7 This is a schematic diagram of the support feet of a bottom support device for numerical control equipment of the present invention.

[0023] In the figure: 1. Support seat; 2. Guide tooth plate; 3. Threaded rod; 4. Motor frame; 5. Servo motor; 6. Cleaning brush cylinder; 7. Limiting cap; 8. Reset spring; 9. Bearing sleeve; 10. Fixed shell; 11. Locking column; 12. Tightening spring; 13. Top ring; 14. Reset top column; 15. Guide sleeve; 16. Through groove; 17. Locking hole; 18. Threaded sleeve; 19. Guide shell seat; 20. Cleaning brush plate; 21. Gear shaft; 22. Connecting gear; 23. Guide groove; 24. Brush cylinder shaft; 25. Extending seat; 26. Extending frame; 27. Extending column; 28. Upper connecting ear; 29. ​​Lower connecting ear; 30. Connecting shaft; 31. Limiting slot block; 32. L-shaped angle block; 33. Pulling ring; 34. Rod seat; 35. Equipment body; 36. Support foot. DETAILED DESCRIPTION

[0024] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0025] like Figure 1-Figure 7The bottom support device of a numerical control equipment shown in the figure includes a support seat 1, a guide shell seat 19 is slidably installed on the middle part of the lower end of the support seat 1, and the guide shell seat 19 plays a role in supporting the cleaning brush plate 20 and the brush cylinder shaft 24, and a cleaning brush plate 20 is fixedly installed at the lower edge of the rear end of the guide shell seat 19, and the cleaning brush plate 20 plays a role in cleaning the industrial floor in the dead corner area between the two cleaning brush cylinders 6, and a brush cylinder shaft 24 is rotatably installed on the inner lower part of the guide shell seat 19, and the two ends of the brush cylinder shaft 24 pass through the two sides of the guide shell seat 19, and the brush cylinder shaft 24 plays a role in supporting the cleaning brush cylinder 6, and the two ends of the brush cylinder shaft 24 are coaxially fixedly installed with cleaning brush cylinders 6, and the cleaning brush cylinders 6 play a role in cleaning the industrial floor below the equipment body 35, and a pusher is installed at the lower end of the support seat 1, and the pusher is connected to the guide shell seat 19, and self-locking parts are installed at the edges of both sides of the upper end of the support seat 1.

[0026] A guide tooth plate 2 is fixedly installed in the middle of the lower end of the support seat 1, and guide grooves 23 are provided on both sides of the guide tooth plate 2. The guide grooves 23 cooperate with the guide shell seat 19 for guiding. The upper end of the guide shell seat 19 is slidably installed inside the guide groove 23, and a gear shaft 21 is rotatably installed in the middle of the inner side of the guide shell seat 19. The gear shaft 21 plays a role in carrying the connecting gear 22. The outer surface of the brush cylinder shaft 24 and the outer surface of the gear shaft 21 are coaxially inlaid with a connecting gear 22, and the two connecting gears 22 are meshed with each other. The connecting gear 22 on the gear shaft 21 is meshed with the guide tooth plate 2, and the connecting gear 22 and the guide tooth plate 2 allow the cleaning brush cylinder 6 to rotate to increase the cleaning force.

[0027] The pushing member includes a threaded rod 3 arranged at the lower end of the support seat 1, the threaded rod 3 is located on the side of the guide gear plate 2, and a threaded sleeve 18 is screwed on the outer surface of the threaded rod 3. The threaded rod 3 plays a role in driving the threaded sleeve 18 to move. The side of the threaded sleeve 18 is fixed to the upper side of the guide shell seat 19. A servo motor 5 is installed at the rear end of the support seat 1. The servo motor 5 drives the threaded rod 3 to rotate to drive the threaded sleeve 18 to move, and then drives the guide shell seat 19 to slide on the guide gear plate 2 to drive the cleaning brush cylinder 6 and the cleaning brush plate 20 on the guide shell seat 19 to move. At the same time, during the movement of the guide shell seat 19, the connecting gear 22 in the guide shell seat 19 will roll on the guide gear plate 2, and then drive the cleaning brush cylinder 6 on the brush cylinder shaft 24 to rotate, so as to repeatedly clean the debris on the industrial ground below the equipment to push it out of the equipment. The servo motor 5 plays a role in driving the threaded rod 3 to rotate, and the output end of the servo motor 5 is fixed to the threaded rod 3.

[0028] A motor frame 4 is fixedly installed on the side of the servo motor 5, and the motor frame 4 serves to fix the servo motor 5. The end of the motor frame 4 is fixed to the support seat 1, and both ends of the threaded rod 3 are rotatably installed with a fixed rod seat 34. The upper end of the fixed rod seat 34 is fixed to the support seat 1, and the fixed rod seat 34 serves to support the threaded rod 3.

[0029] The self-locking part includes a bearing sleeve 9 which is embedded in the middle part of the edges of both sides of the upper end of the support seat 1. A reset top column 14 is coaxially installed on the upper end of the bearing sleeve 9. The reset top column 14 extends into the interior of the bearing sleeve 9. The bearing sleeve 9 and the reset top column 14 play a role of vertically guiding the guide sleeve 15. The reset top column 14 slides with the bearing sleeve 9. The upper end of the reset top column 14 is fixedly installed with a guide sleeve 15. Two extending columns 27 are symmetrically installed inside the guide sleeve 15. The guide sleeve 15 plays a role of guiding the extending columns 27. The two extending columns 27 respectively penetrate from both ends of the guide sleeve 15. Two limit slot blocks 31 are symmetrically fixedly installed at the ends of the two extending columns 27. The size of the two limit slot blocks 31 is the same as the internal space size of the support leg 36, so that when the limit slot block 31 enters the support leg 36, it can just fit the inner surface of the support leg 36 to prevent shaking.

[0030] The edges of the opposite surfaces of the limiting groove blocks 31 on the two extending columns 27 are inclined, which can facilitate the limiting groove blocks 31 to enter the support legs 36. The opposite surfaces of the limiting groove blocks 31 on the two extending columns 27 are fixedly installed with L-shaped corner blocks 32. The ends of the L-shaped corner blocks 32 are arranged in an arc surface, which can facilitate the L-shaped corner blocks 32 to be pushed against the ends of the support legs 36. An extending seat 25 extends from the upper end of the guide sleeve 15. The extending seat 25 and the guide sleeve 15 are integrally formed. An extending frame 26 is connected between the extending column 27 and the bearing sleeve 9. The extending frame 26 plays a role in pushing out the extending column 27. The extending frame 26 is inclined.

[0031] The lower end of the reset top column 14 is coaxially fixed with a limit cap 7, which fits inside the bearing sleeve 9. The limit cap 7 prevents the reset top column 14 from separating from the bearing sleeve 9. A reset spring 8 is fixed at the lower end of the limit cap 7. The end of the reset spring 8 is fixed to the inner bottom surface of the bearing sleeve 9. The reset spring 8 pushes the reset top column 14 upward. An upper connecting ear 28 extends from the lower end of the extending column 27 near the edge. Two through grooves 16 are symmetrically provided on the lower end surface of the guide sleeve 15. The upper connecting ear 28 can fit in the through groove 16 and slide to adjust the extending The column 27 is used for guidance, and the upper connecting ear 28 passes through the inside of the through groove 16. Two lower connecting ears 29 are symmetrically extended from the outer surface of the bearing sleeve 9. The lower connecting ear 29 and the upper connecting ear 28 play the role of bearing the connecting shaft 30. The lower connecting ear 29 and the upper connecting ear 28 are respectively located at the two ends of the extension frame 26. Both ends of the extension frame 26 are penetrated and rotatably installed with a connecting shaft 30. The two connecting shafts 30 are respectively penetrated and embedded in the interior of the lower connecting ear 29 and the interior of the upper connecting ear 28. The connecting shaft 30 plays the role of connecting the lower connecting ear 29, the upper connecting ear 28 and the extension frame 26.

[0032] A fixed shell 10 is fixedly installed at the upper edge of the side of the bearing sleeve 9, and a locking column 11 is coaxially arranged inside the fixed shell 10. The fixed shell 10 plays a role in supporting the locking column 11. Both ends of the locking column 11 pass through the two sides of the fixed shell 10. The locking column 11 slides with the fixed shell 10. The locking column 11 passes through the side of the bearing sleeve 9. The locking column 11 can fix the reset top column 14 so that the reset top column 14 cannot move. A locking hole 17 is opened on the side of the reset top column 14. The locking hole 17 plays a role in cooperating with the locking column 11. One end of the locking column 11 is attached to the The locking column 11 is fitted inside the locking hole 17, and a pulling ring 33 is fixedly installed on the other end of the locking column 11. The pulling ring 33 serves to facilitate the holding and pulling of the locking column 11. The outer surface of the locking column 11 is coaxially inlaid with a top ring 13, and the top ring 13 is fitted to the inner surface of the fixed shell 10. The top ring 13 serves to be pushed by the tensioning spring 12. The outer side of the locking column 11 is wrapped with a tensioning spring 12. The two ends of the tensioning spring 12 are respectively fixed to the side of the top ring 13 and the inner side of the fixed shell 10. The tensioning spring 12 serves to fix the locking column 11 in the locking hole 17.

[0033] When supporting, the equipment body 35 is hoisted and aligned to the top of the support seat 1 and placed downward. At this time, the extension seat 25 is attached to the bottom of the equipment body 35 and moves downward synchronously under the downward pressure of the downwardly moving equipment body 35. At this time, the reset top column 14 is attached to the bearing sleeve 9 and slides to assist the downward movement of the guide sleeve 15. At the same time, the extension frame 26 moves synchronously under the drive of the downwardly moving guide sleeve 15 to push the extension column 27 out of the guide sleeve 15, so that the limiting groove block 31 at the end of the extension column 27 can enter the support foot 36 at the bottom of the equipment body 35, and at the same time, the L-shaped angle block 32 is pressed against the end of the support foot 36 to limit the left and right directions of the equipment body 35. At this time, the support foot 36 on the equipment body 35 is just pressed on the support seat 1 and supported by the support seat 1. In this process, the locking column 11 in the fixed shell 10 is pushed out by the tightening spring 12 and enters the reset top column 14, so as to lock and fix the bearing sleeve 9 and the reset top column 14, so as to limit the upper and lower positions of the equipment body 35, so as to fix the equipment body 35 on the support seat 1 for support. When the debris attached to the industrial floor below the equipment body 35 needs to be cleaned during use, the servo motor 5 can be used to drive the threaded rod 3 to rotate, so as to drive the threaded sleeve 18 to move, and then drive the guide shell seat 19 to slide on the guide tooth plate 2, so as to drive the cleaning brush cylinder 6 and the cleaning brush plate 20 on the guide shell seat 19 to move. At the same time, when the guide shell seat 19 is moving, the connecting gear 22 in the guide shell seat 19 will roll on the guide tooth plate 2, so as to drive the cleaning brush cylinder 6 on the brush cylinder shaft 24 to rotate, so as to repeatedly clean the debris on the industrial floor below the equipment, so as to push it out of the equipment for collection and treatment.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A bottom support device for a numerical control device, comprising a support seat (1), characterized in that: A guide housing seat (19) is slidably mounted on the middle part of the lower end of the support seat (1), a cleaning brush plate (20) is fixedly mounted on the lower edge of the rear end of the guide housing seat (19), a brush cylinder shaft (24) is rotatably mounted on the inner lower part of the guide housing seat (19), two ends of the brush cylinder shaft (24) pass through the two sides of the guide housing seat (19), and a cleaning brush cylinder (6) is coaxially fixedly mounted on both ends of the brush cylinder shaft (24), a pusher is mounted on the lower end of the support seat (1), the pusher is connected to the guide housing seat (19), self-locking parts are mounted on the edges of both sides of the upper end of the support seat (1), a guide tooth plate (2) is fixedly mounted on the middle part of the lower end of the support seat (1), and guide grooves (23) are provided on both sides of the guide tooth plate (2). ), the upper end of the guide housing seat (19) is slidably mounted inside the guide groove (23), a gear shaft (21) is rotatably mounted on the inner middle part of the guide housing seat (19), the outer surface of the brush cylinder shaft (24) and the outer surface of the gear shaft (21) are coaxially inlaid with a connecting gear (22), the two connecting gears (22) are meshed, the connecting gear (22) on the gear shaft (21) is meshed with the guide tooth plate (2), the pushing member comprises a threaded rod (3) arranged at the lower end of the support seat (1), the threaded rod (3) is located on the side of the guide tooth plate (2), the outer surface of the threaded rod (3) is screwed with a threaded sleeve (18), the side surface of the threaded sleeve (18) is fixed to the upper side surface of the guide housing seat (19), A servo motor (5) is installed at the rear end of the support seat (1), and the output end of the servo motor (5) is fixed to the threaded rod (3). The self-locking member includes a bearing sleeve (9) which penetrates and is embedded in the middle of the edges of both sides of the upper end of the support seat (1). A reset top column (14) is coaxially installed on the upper end of the bearing sleeve (9). The reset top column (14) extends into the interior of the bearing sleeve (9). The reset top column (14) and the bearing sleeve (9) are slidably matched. A guide sleeve (15) is fixedly installed on the upper end of the reset top column (14). Two protruding columns (27) are symmetrically installed inside the guide sleeve (15). The two protruding columns (27) respectively penetrate from the two ends of the guide sleeve (15). The ends of the two protruding columns (27) are Two limiting groove blocks (31) are symmetrically fixedly installed, and the edges of the opposite surfaces of the limiting groove blocks (31) on the two extending columns (27) are inclined. The opposite surfaces of the limiting groove blocks (31) on the two extending columns (27) are fixedly installed with L-shaped corner blocks (32), and the ends of the L-shaped corner blocks (32) are arranged in an arc surface. The upper end of the guide sleeve (15) extends with a protruding seat (25), and the protruding seat (25) and the guide sleeve (15) are integrally formed. A protruding frame (26) is connected between the extending column (27) and the bearing sleeve (9), and the protruding frame (26) is inclined. The lower end of the reset top column (14) is coaxially fixedly installed with a limiting cap (7), and the limiting cap (7) fits the inside of the bearing sleeve (9).A return spring (8) is fixedly mounted on the lower end of the limiting cap (7), and the end of the return spring (8) is fixed to the inner bottom surface of the bearing sleeve (9). An upper connecting ear (28) extends from the lower end of the extending column (27) near the edge. Two through slots (16) are symmetrically provided on the lower end surface of the guide sleeve (15), and the upper connecting ear (28) extends from the inside of the through slot (16). Two lower connecting ears (29) are symmetrically extended from the outer surface of the bearing sleeve (9). The lower connecting ear (29) and the upper connecting ear (28) are respectively located at the two ends of the extending frame (26). Both ends of the extending frame (26) are rotatably mounted with connecting shafts (30). The two connecting shafts (30) are respectively inserted and embedded in the inside of the lower connecting ear (29) and the inside of the upper connecting ear (28). A fixing shell (29) is fixedly mounted on the upper edge of the side surface of the bearing sleeve (9). 10), a locking column (11) is coaxially arranged inside the fixed shell (10), and the two ends of the locking column (11) extend through the two sides of the fixed shell (10), and the locking column (11) and the fixed shell (10) are slidably matched, and the locking column (11) passes through the side of the bearing sleeve (9), and the side of the reset top column (14) is provided with a locking hole (17), and one end of the locking column (11) is fitted inside the locking hole (17), and the other end of the locking column (11) is fixedly installed with a pulling ring (33), and the outer surface of the locking column (11) is coaxially inlaid with a top ring (13), and the top ring (13) is fitted to the inner surface of the fixed shell (10), and the outer side of the locking column (11) is wound with a tensioning spring (12), and the two ends of the tensioning spring (12) are respectively fixed to the side of the top ring (13) and the inner side of the fixed shell (10).

2. A bottom support device for numerical control equipment according to claim 1, characterized in that: A motor frame (4) is fixedly mounted on the side of the servo motor (5), the end of the motor frame (4) is fixed to the support seat (1), and both ends of the threaded rod (3) are rotatably mounted with a rod fixing seat (34), and the upper end of the rod fixing seat (34) is fixed to the support seat (1).

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