Heavy vertical curling machine

Abstract

The utility model relates to the technical field of heavy vertical curling machines, which comprises a rack, a workpiece seat mounted on the rack and used for placing a workpiece, and a curling device arranged above the workpiece seat, the hemming device comprises a roller mechanism used for conducting hemming forming on a workpiece, a main shaft and a rotation driving motor used for driving the roller mechanism to rotate. The roller mechanism is mounted on the main shaft, and the rotation driving motor is connected with the main shaft and drives the roller mechanism mounted on the main shaft to rotate; the roller mechanism comprises a pre-bending roller, a hemming roller and a balancing mechanism used for balancing the pre-bending roller and the hemming roller. By arranging the balance mechanism, the pre-bending roller and the hemming roller are mounted on the balance mechanism, and the balance operation of the pre-bending roller and the hemming roller can be ensured in the process of processing a workpiece through the balance mechanism, so that the quality and the yield of a product are improved, and the service life of equipment is prolonged; meanwhile, the vertical design can greatly save the occupied space of the equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, in particular to mechanical processing equipment for pre-bending and curling large materials. Background Art

[0002] For the processing of cylindrical materials, rolling and curling are generally required, such as shrinking, expanding, curling and other processing procedures. The curling processing method is generally stamping or rolling. In the rolling forming process of curling, the workpiece is generally driven by a motor to rotate. First, the workpiece needs to be rolled by a pre-bending mechanism to pre-bend it, and then the workpiece is curled by a curling mechanism to complete the curling process.

[0003] However, in the current equipment, when the curling mechanism and / or pre-bending mechanism is in the process of processing, it is possible that deviations and imbalances may occur due to the uneven surface of the workpiece or the uneven force on the curling mechanism and / or pre-bending mechanism during processing, which will cause uneven force on the material, thereby affecting the quality and output of the product and causing the product to be scrapped or damaged; at the same time, it may even cause the curling mechanism and / or pre-bending mechanism to generate additional friction and heat during operation, accelerate the wear and aging of the equipment, and cause the equipment to overheat or even malfunction and damage.

[0004] Therefore, people are in urgent need of a curling device that can effectively ensure that the curling mechanism and / or pre-bending mechanism remain balanced during the processing process to ensure the quality of the product. Utility Model Content

[0005] The utility model provides a heavy-duty vertical curling machine which has an ingenious equipment structure and effectively ensures that a curling mechanism and / or a pre-bending mechanism maintains balance during the processing process, thereby ensuring the quality of the product.

[0006] The technical solution of the utility model is a heavy-duty vertical curling machine, comprising a frame, a workpiece seat installed on the frame for placing the workpiece, and a curling device arranged above the workpiece seat;

[0007] The curling device comprises a roller mechanism for curling the workpiece, a main shaft and a rotary drive motor for driving the roller mechanism to rotate;

[0008] The roller mechanism is installed on the main shaft, and the rotation drive motor is connected to the main shaft and drives the roller mechanism installed on the main shaft to rotate;

[0009] The roller mechanism comprises a pre-bending roller, a curling roller and a balancing mechanism for balancing the pre-bending roller and the curling roller.

[0010] Furthermore, the balancing mechanism includes a base plate for mounting a pre-bending roller and a curling roller, a plurality of balancing wheels and a balancing plate, wherein the base plate is connected to the main shaft, and the pre-bending roller and the curling roller are arranged below the base plate; the balancing plate is arranged above the base plate, and the plurality of balancing wheels are evenly distributed between the balancing plate and the base plate and roll and displace between the balancing plate and the base plate.

[0011] Furthermore, the pre-bending roller is provided with a pre-bending wheel adjustment mechanism, and the hemming roller is provided with a hemming wheel adjustment mechanism;

[0012] The pre-bending adjustment mechanism includes a pre-bending screw, a pre-bending guide rail and a pre-bending wheel mounting seat, and both ends of the pre-bending screw are provided with pre-bending support seats for supporting the rotation of the pre-bending screw. The pre-bending screw is threadedly connected to the pre-bending wheel mounting seat and drives the pre-bending wheel mounting seat to slide on the pre-bending guide rail; the curling adjustment mechanism includes a curling screw, a curling guide rail and a curling wheel mounting seat, and both ends of the curling screw are provided with curling support seats for supporting the rotation of the curling screw. The curling screw is threadedly connected to the curling wheel mounting seat and drives the curling wheel mounting seat to slide on the curling guide rail.

[0013] Furthermore, a pre-bending lifting cylinder is provided between the pre-bending roller and the pre-bending wheel mounting seat, one end of the pre-bending lifting cylinder is connected and fixed to the pre-bending wheel mounting seat, and the other end of the pre-bending lifting cylinder is connected and fixed to the pre-bending roller to drive the pre-bending roller to move up and down.

[0014] Furthermore, a positioning mechanism is provided between the curling device and the workpiece seat, and the positioning mechanism includes a positioning seat arranged in the middle of the workpiece seat and a positioning column arranged in the middle of the curling device and corresponding to the positioning seat, the positioning seat is provided with a through hole, and the positioning column is movably inserted in the through hole of the positioning seat; a rotating bearing is provided between the positioning seat and the workpiece seat.

[0015] Furthermore, a clamping mechanism is provided between the workpiece seat and the curling device, and the clamping mechanism includes a positioning plate for clamping and fixing the workpiece. An opening is provided through the middle of the positioning plate, and the opening corresponds to the shape of the workpiece to be processed. The workpiece is placed between the workpiece seat and the positioning plate, and the positioning plate and the workpiece seat cooperate with each other to clamp and fix the workpiece.

[0016] Furthermore, the frame is provided with clamping lifting cylinders on both sides of the clamping mechanism, and the clamping lifting cylinders are connected to the positioning plate and drive the positioning plate to move up and down.

[0017] Furthermore, an adjustment frame is provided between the clamping and lifting cylinder and the positioning plate, and the adjustment frame is composed of two fixed longitudinal beams and two movable cross beams. The fixed longitudinal beams are connected and fixed to the clamping and lifting cylinder, and a plurality of adjustment holes for installing the movable cross beams are evenly distributed on the fixed longitudinal beams. The fixed longitudinal beams and the movable cross beams are connected by bolts; the positioning plate is connected and fixed to the movable cross beams.

[0018] Furthermore, a feeding mechanism is provided at the bottom of the workpiece seat, and the feeding mechanism includes a workpiece mounting seat and a feeding guide rail. The workpiece seat is arranged on the workpiece mounting seat, and the workpiece mounting seat is slidably arranged on the feeding guide rail and slides and displaces along the direction of the feeding guide rail.

[0019] Furthermore, the curling device is provided with a curling lifting mechanism, which includes a lifting drive motor and an active screw and a driven screw symmetrically arranged on both sides of the curling device, and the active screw and the driven screw are connected to the curling device through a mounting seat; a slide rail is provided at the bottom of the mounting seat, and the mounting seat is slidably arranged on the slide rail; the active screw is connected to the drive motor, and a linkage mechanism is provided between the active screw and the driven screw, and the linkage mechanism includes a driving gear set, a driven gear set and a transmission rack, and the active screw drives the driven screw to rotate synchronously through the cooperation of the active gear set, the driven gear set and the transmission rack.

[0020] Compared with the prior art, the beneficial effects of the utility model are as follows: by providing a balancing mechanism, the pre-bending roller and the curling roller are installed on the balancing mechanism, and the balancing mechanism is used to ensure the balanced operation of the pre-bending roller and the curling roller during the processing process, thereby improving the quality and output of the product and extending the service life of the equipment; at the same time, the vertical design can greatly save the space occupied by the equipment, thereby realizing effective space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is the front view of the utility model;

[0023] Figure 3 It is a cross-sectional view of the utility model;

[0024] Figure 4 This utility model Figure 3 A partial enlarged schematic diagram of point "A";

[0025] Figure 5 It is a top view of the utility model;

[0026] Among them, 1. workpiece, 2. workpiece seat, 3. spindle, 4. rotation drive motor, 5. pre-bending roller, 6. curling roller, 7. base plate, 8. balance wheel, 9. balance plate, 10. pre-bending screw, 11. pre-bending guide rail, 12. pre-bending wheel mounting seat, 13. pre-bending support seat, 14. curling screw, 15. curling guide rail, 16. curling wheel mounting seat, 17. curling support seat, 18. pre-bending lifting cylinder, 19. . Positioning seat, 20. Positioning column, 21. Positioning hole, 22. Rotating bearing, 23. Positioning plate, 24. Clamping lifting cylinder, 25. Fixed longitudinal beam, 26. Movable cross beam, 27. Adjustment hole, 28. Workpiece mounting seat, 29. Feeding guide rail, 30. Lifting drive motor, 31. Active screw rod, 32. Driven screw rod, 33. Mounting seat, 34. Slide rail, 35. Active gear set, 36. Driven gear set. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the utility model, so as to fully understand the purpose, scheme and effect of the utility model. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0028] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, top, bottom, etc. used in the present invention are only relative to the relative positional relationship of the various components of the present invention in the accompanying drawings.

[0029] In addition, unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art. The terms used in this specification are only for describing specific embodiments, not for limiting the present invention. The term "and / or" used herein includes any combination of one or more related listed items.

[0030] It should be understood that, although the terms first, second, third, etc. may be used to describe various elements in the present disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, without departing from the scope of the present disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0031] Reference Figures 1 to 4As shown, the technical solution of the utility model is a heavy-duty vertical curling machine, including a frame, a workpiece seat 2 installed on the frame for placing a workpiece 1, and a curling device arranged above the workpiece seat 2; the curling device includes a roller mechanism for curling the workpiece 1, a spindle 3, and a rotary drive motor 4 for driving the roller mechanism to rotate; the roller mechanism is installed on the spindle 3, and the rotary drive motor 4 is connected to the spindle 3 and drives the roller mechanism installed on the spindle 3 to rotate; the roller mechanism includes a pre-bending roller 5, a curling roller 6, and a balancing mechanism for balancing the pre-bending roller 5 and the curling roller 6. By providing a balancing mechanism, the pre-bending roller 5 and the curling roller 6 are installed on the balancing mechanism, and the balancing mechanism is used to ensure balanced operation of the pre-bending roller 5 and the curling roller 6 during the processing of the workpiece 1, thereby improving the quality and output of the product and extending the service life of the equipment; at the same time, the vertical design can greatly save the space occupied by the equipment, thereby realizing effective space utilization.

[0032] like Figure 2 As shown, in order to ensure that the processing components such as the pre-bending roller 5 and the hemming roller 6 are balanced during processing, the balancing mechanism includes a base plate 7 for mounting the pre-bending roller 5 and the hemming roller 6, a plurality of balancing wheels 8 and a balancing plate 9, wherein the base plate 7 is connected to the spindle 3, the pre-bending roller 5 and the hemming roller 6 are arranged below the base plate 7; the balancing plate 9 is arranged above the base plate 7, and the plurality of balancing wheels 8 are evenly arranged between the balancing plate 9 and the base plate 7 and are rolled and displaced between the balancing plate 9 and the base plate 7. The balancing wheel 8 is made to roll on the balancing plate 9, with the plane of the balancing plate 9 as a reference, to ensure that the pre-bending roller 5 and the hemming roller 6 can be uniformly balanced, and to avoid the occurrence of deviations and imbalances during processing due to the uneven surface of the workpiece 1 or the uneven force on the hemming mechanism and / or the pre-bending mechanism during processing.

[0033] like Figure 2As shown, in order to enable the equipment to process workpieces 1 of different models and sizes, the pre-bending roller 5 is provided with a pre-bending wheel adjustment mechanism, and the hemming roller 6 is provided with a hemming wheel adjustment mechanism; the pre-bending adjustment mechanism includes a pre-bending screw 10, a pre-bending guide rail 11, and a pre-bending wheel mounting seat 12, and both ends of the pre-bending screw 10 are provided with a pre-bending support seat 13 for supporting the rotation of the pre-bending screw 10, and the pre-bending screw 10 is threadedly connected to the pre-bending wheel mounting seat 12 and drives the pre-bending wheel mounting seat 12 to slide and displace on the pre-bending guide rail 11. The hemming adjustment mechanism includes a hemming screw 14, a hemming guide rail 15, and a hemming wheel mounting seat 16, and both ends of the hemming screw 14 are provided with a hemming support seat 17 for supporting the rotation of the hemming screw 14, and the hemming screw 14 is threadedly connected to the hemming wheel mounting seat 16 and drives the hemming wheel mounting seat 16 to slide and displace on the hemming guide rail 15. Therefore, the pre-bending adjustment mechanism and the curling wheel adjustment mechanism are provided to flexibly adjust the pre-bending wheel and the curling wheel, thereby improving the practicability of the equipment.

[0034] like Figure 3 As shown, in order to facilitate the switching of the pre-bending roller 5 to process the workpiece, a pre-bending lifting cylinder 18 is provided between the pre-bending roller 5 and the pre-bending wheel mounting seat 12. One end of the pre-bending lifting cylinder 18 is fixedly connected to the pre-bending wheel mounting seat 12, and the other end is fixedly connected to the pre-bending roller 5 to drive the pre-bending roller 5 to move up and down. When the pre-bending roller 5 processes the workpiece, the pre-bending lifting cylinder 18 drives the pre-bending roller 5 to move downward and extend to perform pre-bending rolling processing on the workpiece; when the processing is completed, the pre-bending lifting cylinder 18 drives the pre-bending roller 5 to move upward and retract to exit the processing station.

[0035] like Figure 3 As shown, in order to improve the stability of the equipment during rolling and rotating processing, a positioning mechanism is provided between the curling device and the workpiece seat 2, and the positioning mechanism includes a positioning seat 19 provided in the middle of the workpiece seat 2 and a positioning column 20 provided in the middle of the curling device and corresponding to the positioning seat 19, the positioning seat 19 is provided with a through hole 21, and the positioning column 20 is movably inserted in the through hole 21 of the positioning seat 19 for connection; a rotating bearing 22 is provided between the positioning seat 19 and the workpiece seat 2. When the curling device performs a rotating rolling process on the workpiece 1, the positioning column 20 and the positioning seat 19 can cooperate with each other to ensure the relative stability between the curling device and the workpiece seat 2, prevent the occurrence of offset and the like, and improve the processing quality.

[0036] like Figure 4As shown, in order to prevent the workpiece 1 from being displaced and detached in the workpiece seat 2 and to ensure the accuracy of the processing position, a clamping mechanism is provided between the workpiece seat 2 and the curling device, and the clamping mechanism includes a positioning plate 23 for clamping and fixing the workpiece 1. An opening is provided through the middle of the positioning plate 23, and the opening corresponds to the shape of the workpiece 1 to be processed. The workpiece 1 is placed between the workpiece seat 2 and the positioning plate 23, and the positioning plate 23 and the workpiece seat 2 cooperate with each other to clamp and fix the workpiece 1.

[0037] like Figure 1 As shown, the frame is provided with clamping lifting cylinders 24 on both sides of the clamping mechanism, and the clamping lifting cylinders 24 are connected to the positioning plate 23 and drive the positioning plate 23 to move up and down, so that the positioning plate 23 can cooperate with the workpiece seat 2 to clamp and fix the workpiece 1 therebetween.

[0038] like Figure 1 As shown, in order to make the equipment applicable to clamping and fixing workpieces 1 of different models and sizes, an adjustment frame is also provided between the clamping and lifting cylinder 24 and the positioning plate 23, and the adjustment frame is composed of two fixed longitudinal beams 25 and two movable cross beams 26. The fixed longitudinal beams 25 are connected and fixed to the clamping and lifting cylinder 24, and a plurality of adjustment holes 27 for installing the movable cross beams 26 are evenly distributed on the fixed longitudinal beams 25. The fixed longitudinal beams 25 and the movable cross beams 26 are connected by bolts; the positioning plate 23 is connected and fixed to the movable cross beam 26. Therefore, the position of the movable cross beam 26 can be adjusted by disassembling, so that positioning plates 23 of different models and sizes can be installed to clamp and fix workpieces 1 of different models and sizes.

[0039] like Figure 1 and Figure 5 As shown, in order to facilitate the processing of the large workpiece 1, a feeding mechanism is provided at the bottom of the workpiece seat 2, and the feeding mechanism includes a workpiece mounting seat 28 and a feeding guide rail 29. The workpiece seat 2 is arranged on the workpiece mounting seat 28, and the workpiece mounting seat 28 is slidably arranged on the feeding guide rail 29 and slides and moves along the direction of the feeding guide rail 29. Therefore, by providing the feeding guide rail 29 and the workpiece mounting seat 28 to cooperate with each other, the large workpiece 1 can be quickly and conveniently moved, thereby improving the production and processing efficiency.

[0040] like Figure 5As shown, in order to drive the curling device to rise and / or descend for processing, the curling device is provided with a curling lifting mechanism, which includes a lifting drive motor 30 and an active screw 31 and a driven screw 32 symmetrically arranged on both sides of the curling device, the active screw 31 and the driven screw 32 are connected to the curling device through a mounting seat 33; a slide rail 34 is provided at the bottom of the mounting seat 33, and the mounting seat 33 is slidably arranged on the slide rail 34; the active screw 31 is drivingly connected to the lifting drive motor 30, and a linkage mechanism is provided between the active screw 31 and the driven screw 32, the linkage mechanism includes a driving gear set 35, a driven gear set 36 and a transmission rack, and the active screw 31 drives the driven screw 32 to rotate synchronously through the cooperation of the active gear set 35, the driven gear set 36 and the transmission rack.

[0041] The working principle of the device is as follows: first, the workpiece 1 is placed on the workpiece seat 2, and then the workpiece seat 2 is moved to the bottom of the curling device through the feeding mechanism, and then the workpiece 1 is clamped and fixed on the workpiece seat 2 through the clamping mechanism; when the workpiece 1 is clamped and fixed on the workpiece seat 2, the curling device moves downward to drive the pre-bending roller 5 and the curling roller 6 to roll the workpiece 1; the pre-bending roller 5 and the curling roller 6 are kept balanced during the rolling process through the balancing mechanism.

[0042] The above is only a preferred embodiment of the utility model. The utility model is not limited to the above implementation. As long as the technical effect of the utility model is achieved by the same means, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the scope of protection of the present disclosure. All should belong to the protection scope of the utility model. Within the protection scope of the utility model, its technical solution and / or implementation method can have various modifications and changes.

Claims

1. A heavy-duty vertical curling machine, including a frame, characterized in that: It comprises a workpiece seat (2) installed on a frame for placing a workpiece (1), and a curling device arranged above the workpiece seat (2); The curling device comprises a roller mechanism for curling a workpiece (1), a main shaft (3), and a rotary drive motor (4) for driving the roller mechanism to rotate; The roller mechanism is mounted on the main shaft (3), and the rotation drive motor (4) is connected to the main shaft (3) and drives the roller mechanism mounted on the main shaft (3) to rotate; The roller mechanism comprises a pre-bending roller (5), a curling roller (6), and a balancing mechanism for balancing the pre-bending roller (5) and the curling roller (6).

2. The heavy-duty vertical curling machine according to claim 1, characterized in that: The balancing mechanism comprises a base plate (7) for mounting a pre-bending roller (5) and a curling roller (6), a plurality of balancing wheels (8) and a balancing plate (9); the base plate (7) is connected to the main shaft (3); the pre-bending roller (5) and the curling roller (6) are arranged below the base plate (7); the balancing plate (9) is arranged above the base plate (7); the plurality of balancing wheels (8) are evenly arranged between the balancing plate (9) and the base plate (7) and are rollingly displaced between the balancing plate (9) and the base plate (7).

3. The heavy-duty vertical curling machine according to claim 2, characterized in that: The pre-bending roller (5) is provided with a pre-bending wheel adjustment mechanism, and the hemming roller (6) is provided with a hemming wheel adjustment mechanism; The pre-bending adjustment mechanism comprises a pre-bending screw (10), a pre-bending guide rail (11) and a pre-bending wheel mounting seat (12), and pre-bending support seats (13) for supporting the rotation of the pre-bending screw (10) are provided at both ends of the pre-bending screw (10), and the pre-bending screw (10) is threadedly connected to the pre-bending wheel mounting seat (12) and drives the pre-bending wheel mounting seat (12) to slide and displace on the pre-bending guide rail (11); the hemming wheel adjustment mechanism comprises a hemming screw (14), a hemming guide rail (15) and a hemming wheel mounting seat (16), and hemming support seats (17) for supporting the rotation of the hemming screw (14) are provided at both ends of the hemming screw (14), and the hemming screw (14) is threadedly connected to the hemming wheel mounting seat (16) and drives the hemming wheel mounting seat (16) to slide and displace on the hemming guide rail (15).

4. The heavy-duty vertical curling machine according to claim 3, characterized in that: A pre-bending lifting cylinder (18) is provided between the pre-bending roller (5) and the pre-bending wheel mounting seat (12); one end of the pre-bending lifting cylinder (18) is fixedly connected to the pre-bending wheel mounting seat (12), and the other end of the pre-bending lifting cylinder (18) is fixedly connected to the pre-bending roller (5) to drive the pre-bending roller (5) to move up and down.

5. The heavy-duty vertical curling machine according to claim 1, characterized in that: A positioning mechanism is provided between the curling device and the workpiece seat (2), the positioning mechanism comprising a positioning seat (19) arranged in the middle of the workpiece seat (2) and a positioning column (20) arranged in the middle of the curling device and corresponding to the positioning seat (19), the positioning seat (19) being provided with a through hole (21), the positioning column (20) being movably plugged into the through hole (21) of the positioning seat (19) for connection; a rotating bearing (22) is provided between the positioning seat (19) and the workpiece seat (2).

6. The heavy-duty vertical curling machine according to claim 1, characterized in that: A clamping mechanism is provided between the workpiece seat (2) and the curling device, the clamping mechanism comprising a positioning plate (23) for clamping and fixing the workpiece (1), an opening is provided through the middle of the positioning plate (23), the opening corresponds to the shape of the part to be processed of the workpiece (1), the workpiece (1) is placed between the workpiece seat (2) and the positioning plate (23), and the positioning plate (23) and the workpiece seat (2) cooperate with each other to clamp and fix the workpiece (1).

7. The heavy-duty vertical curling machine according to claim 6, characterized in that: The frame is provided with clamping lifting cylinders (24) on both sides of the clamping mechanism. The clamping lifting cylinders (24) are connected to the positioning plate (23) and drive the positioning plate (23) to move up and down.

8. The heavy-duty vertical curling machine according to claim 7, characterized in that: An adjustment frame is also provided between the clamping and lifting cylinder (24) and the positioning plate (23), and the adjustment frame is composed of two fixed longitudinal beams (25) and two movable cross beams (26). The fixed longitudinal beams (25) are connected and fixed to the clamping and lifting cylinder (24), and a plurality of adjustment holes (27) for installing the movable cross beams (26) are evenly distributed on the fixed longitudinal beams (25). The fixed longitudinal beams (25) and the movable cross beams (26) are connected by bolts; the positioning plate (23) and the movable cross beams (26) are connected and fixed.

9. The heavy-duty vertical curling machine according to claim 1, characterized in that: A feeding mechanism is provided at the bottom of the workpiece seat (2), the feeding mechanism comprising a workpiece mounting seat (28) and a feeding guide rail (29), the workpiece seat (2) is arranged on the workpiece mounting seat (28), the workpiece mounting seat (28) is slidably arranged on the feeding guide rail (29) and slides and moves along the direction of the feeding guide rail (29).

10. The heavy-duty vertical curling machine according to claim 1, characterized in that: The curling device is provided with a curling lifting mechanism, which comprises a lifting drive motor (30) and an active screw rod (31) and a driven screw rod (32) symmetrically arranged on both sides of the curling device, wherein the active screw rod (31) and the driven screw rod (32) are both connected to the curling device through a mounting seat (33); a slide rail (34) is provided at the bottom of the mounting seat (33), and the mounting seat (33) is slidably arranged on the slide rail (34); the active screw rod (31) is drivingly connected to the lifting drive motor (30), and a linkage mechanism is provided between the active screw rod (31) and the driven screw rod (32), wherein the linkage mechanism comprises a driving gear set (35), a driven gear set (36) and a transmission rack, and the active screw rod (31) drives the driven screw rod (32) to rotate synchronously through the cooperation of the active gear set (35), the driven gear set (36) and the transmission rack.

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