Transfer manipulator structure
By designing a load transfer robot structure including a support frame, a fixture frame and a lifting mobile frame, the problem of difficulty in transferring batteries between the upper and lower layers of fixtures is solved, efficient production line transfer is achieved, production efficiency is improved and area occupied is reduced.
Patent Information
- Application Number
- CN202323452605.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-18
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2033-12-18
AI Technical Summary
In the existing battery production lines, it is difficult to transfer batteries between the upper and lower fixtures, resulting in low production efficiency and large area occupied by the production line.
A load transfer robot structure is designed, including a support frame, a fixing frame and a lifting mobile frame, and the battery transfer between the upper and lower fixtures is realized through the guide rail and the lifting mechanism.
It realizes efficient transfer of batteries between the upper and lower fixtures, improves production efficiency and reduces the area occupied by the production line.
Smart Images
Figure CN222680866U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of transfer, and in particular relates to a transfer manipulator structure. Background Art
[0002] The production process of lithium batteries requires the processing of formation (aging), capacity division, hot pressing and other processes. In order to improve the efficiency of battery production, the hot pressing, formation, capacity division and other processes of the battery will be completed on the same production line. Since the fixtures involved in different workstations are also different, it is necessary to transfer the battery from one set of fixtures to another set of fixtures, so it is necessary to set up an overhead crane manipulator to transfer the battery.
[0003] At present, the production line of the battery back-end process is long, so it will occupy the area of the production workshop, so the production line is designed as a double-layer structure. In order to match the transfer of the upper and lower layers of batteries, it is necessary to design an overhead crane that can meet the transfer of the upper and lower layers. Utility Model Content
[0004] The utility model aims to provide a transfer manipulator structure, which can meet the needs of transferring batteries in different clamps of upper and lower layers and realize the transfer of battery production lines of upper and lower layers.
[0005] To achieve the above-mentioned purpose, an embodiment of the utility model provides a transfer robot structure, including a support frame, a fixed frame and a lifting and moving frame; the two support frames are arranged opposite to each other, and the two fixed frames are arranged opposite to each other and are located at one end of the support frames; guide rails and lifting mechanisms are provided on the opposite sides of the two support frames; the lifting mechanism includes a carrier plate, and a first supporting slide rail and a first rack are provided on the carrier plate; the fixed frame is provided with two layers of supporting structures, and each supporting structure is provided with a second rack and a second supporting slide rail; the lifting and moving frame includes a frame, a motor, a transmission shaft and a first gear; support pulleys are provided at both ends of the frame and supported on corresponding supporting slide rails; the motor is provided on the frame, the transmission shaft is rotatably connected to one side of the frame, and the two ends of the transmission shaft extend to the top of the support frame, and the first gear is provided at both ends of the transmission shaft, the first gear is meshed with the first rack or the second rack, and the motor is connected to the transmission shaft for driving the transmission shaft to rotate; a clamping mechanism is provided on the bottom side of the frame.
[0006] Furthermore, fixed plates are provided at both ends of the frame, and two sets of supporting pulleys are provided at the bottom of the fixed plates; the supporting pulleys include a rotating shaft and two rollers, two supporting plates extend upward from the bottom side of the fixed plate, the rotating shaft rotatably connects the two supporting plates, and the two rollers are sleeved on the rotating shaft.
[0007] Furthermore, an extension portion extending downward is provided at the bottom end of a support plate, and a stop portion is extended from the bottom end of the extension portion and is limited on one side of the support slide rail.
[0008] Furthermore, the lifting mechanism also includes a third rack, a mounting seat, a reducer, a second transmission shaft and a second gear; the two third racks are arranged on both sides of the support frame, and the two mounting seats are slidably connected to the corresponding guide rails; the carrier plate is connected to the two mounting seats, the reducer is arranged on the bottom side of the carrier plate, the second transmission shaft is connected to the reducer, and second gears are arranged at both ends of the second transmission shaft, and the second gear is meshed with the corresponding third racks.
[0009] Furthermore, a supporting cylinder is also provided on the supporting frame, and the supporting cylinder is used to extend into the bottom side of the carrier plate and support the carrier plate.
[0010] Furthermore, the clamping mechanism includes a lifting frame, several groups of clamping components, two lifting mechanisms and a power mechanism; a group of lifting mechanisms are respectively connected to the two ends of the lifting frame, and the lifting mechanisms are arranged on the bottom side of the frame; the power mechanism is connected to the lifting mechanism, which is used to drive the lifting mechanism to drive the lifting frame to rise and fall; the clamping component is arranged on the bottom side of the lifting frame.
[0011] Furthermore, the lifting mechanism includes a base plate, a guide column, a screw assembly and an adjusting rod. The two guide columns and the screw assembly are vertically arranged between the base plate and the frame and connected to the lifting frame. The adjusting rod is obliquely connected to the base plate and the frame. The adjusting rod includes a screw and nuts arranged at both ends of the screw. The nut has a connecting end, which is pivotally connected to the base plate or the frame. The power mechanism is a motor assembly connected to the screw assembly.
[0012] Furthermore, the clamping assembly includes a connecting seat, a clamping member and a pressing plate, and multiple groups of clamping members are arranged in sequence; the connecting seat is provided with a first installation cavity and a second installation cavity distributed up and down, and a partition is provided between the first installation cavity and the second installation cavity;
[0013] The clamping member includes two clamping plates, a guide shaft, a compression spring and a connecting rod; the two clamping plates are cross-arranged and pivotally connected in the second mounting cavity; the guide shaft slides through the partition, a limiting portion is provided at the upper end of the guide shaft, the compression spring is sleeved on the upper end of the guide shaft and limited between the partition and the limiting portion; connecting rods are connected between the lower end of the guide shaft and the two clamping plates, and the two ends of the connecting rod are pivotally connected to the clamping plates and the guide shafts respectively; the pressure plate is arranged in the first mounting cavity and connected to the upper ends of each guide shaft.
[0014] Furthermore, the clamping mechanism also includes an adjusting mechanism, and two groups of clamping assemblies are slidably connected to the bottom side of the lifting frame, and the adjusting mechanism connects the two clamping assemblies to adjust the distance between the two clamping assemblies;
[0015] The adjusting mechanism includes a connecting plate, a motor, a driving gear and an adjusting slide; the connecting plate is arranged on the lifting frame, and two adjusting slides are relatively slidably arranged on the connecting plate, and a plurality of meshing teeth are arranged on opposite sides of the two adjusting slides; the motor is arranged on the bottom side of the connecting plate, and the driving gear is arranged on the motor and meshes with the meshing teeth; one end of the adjusting slide is connected to the corresponding connecting seat.
[0016] The above one or more technical solutions in the formation fixture provided by the embodiment of the utility model have at least the following technical effects:
[0017] When the lifting and moving frame needs to transfer the upper layer of the fixed frame to the lower layer or move from the lower layer to the upper layer, the motor drives the transmission shaft to rotate first, and the first gears at both ends of the transmission shaft mesh with the corresponding second racks, so that the lifting and moving frame and the clamping mechanism at the bottom can be driven to move together, so that the lifting and moving frame as a whole can be moved to the carrier plate on the support frame, and the supporting roller is supported on the first supporting slide rail, and the first gear is meshed with the first rack; the lifting and moving frame is pushed up and down by the lifting mechanism, and when the lifting and moving frame is lifted to the target position, the motor drives the transmission shaft to rotate, so that the first gear rotates, and the first gear meshes with the first rack, so that the frame can be driven to move on the first supporting slide rail and move to the second supporting slide rail, so that the lifting and moving frame can be moved from the support frame to the fixed frame. Therefore, this transfer robot can realize the movement of the upper and lower layers, and then realize the transfer of the clamped batteries on the first and second layers of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0019] Figure 1 This is a structural diagram of a transfer robot provided in an embodiment of the utility model.
[0020] Figure 2 A structural diagram of the support frame portion of the transfer robot provided in an embodiment of the utility model.
[0021] Figure 3 A structural diagram of a lifting and moving frame of a transfer robot provided in an embodiment of the utility model.
[0022] Figure 4 A structural diagram of the clamping mechanism of the transfer robot provided in an embodiment of the utility model.
[0023] Figure 5 A cross-sectional view of a clamping assembly of a transfer robot provided in an embodiment of the utility model. DETAILED DESCRIPTION
[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.
[0025] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.
[0028] In one embodiment of the transfer robot structure of the utility model, please refer to Figures 1 to 3 , a transfer robot comprises a support frame 100, a fixed frame (not shown in the drawings) and a lifting and moving frame 200. The two support frames 100 are arranged opposite to each other, and the two fixed frames are arranged opposite to each other and are located at one end of the support frames 100. Guide rails 101 and lifting mechanisms 300 are provided on opposite sides of the two support frames 100. The lifting mechanism 300 comprises a carrier plate 310, on which a first supporting slide rail 311 and a first rack 312 are provided. The fixed frame is provided with two layers of supporting structures, and each supporting structure is provided with a second rack and a second supporting slide rail.
[0029] The lifting and moving frame 200 includes a frame 210, a motor 220, a transmission shaft 230 and a first gear 240. Support pulleys 250 are provided at both ends of the frame 210 and supported on the corresponding first support rails 311. The motor 220 is provided on the frame 210, the transmission shaft 230 is rotatably connected to one side of the frame 210, and both ends of the transmission shaft 230 extend upward from the support frame 100, and both ends of the transmission shaft 230 are provided with a first gear 240, the first gear 240 is meshed with the first rack 312 or the second rack, and the motor 220 is connected to the transmission shaft 230 to drive the transmission shaft 230 to rotate; a clamping mechanism 400 is provided on the bottom side of the frame 210.
[0030] When the lifting and moving frame 200 needs to transfer the upper support structure of the fixed frame to the lower support structure or move from the lower support structure to the upper support structure, the motor 220 first drives the transmission shaft 230 to rotate, and the first gears 240 at both ends of the transmission shaft 230 are meshed with the corresponding second racks, so that the lifting and moving frame 200 and the clamping mechanism 400 at the bottom can be driven to move together, so that the lifting and moving frame 200 can be moved as a whole to the carrier plate 310 on the support frame 100, and the support roller 250 is supported on the first support rail 311, and the first gear 240 is meshed with the first rack 240; the lifting mechanism 300 drives the lifting and moving frame 200 to rise and fall. When the lifting and moving frame is lifted to the target position, the motor 220 can drive the transmission shaft 230 to rotate, so that the first gear 240 rotates. The first gear 240 is meshed with the first rack 312, so that the frame 210 can be driven to move on the first support rail 311 and move to the second support rail, so that the lifting and moving frame 200 can be moved from the support frame 100 to the fixed frame. Therefore, the transfer robot can realize the movement of the upper and lower layers, and then realize the transfer of the clamped battery on the first and second layers of the equipment.
[0031] Further, refer to Figure 3 , two ends of the frame 210 are provided with fixed plates 211, and two sets of supporting pulleys 250 are provided at the bottom of the fixed plates 211; the supporting pulleys 250 include a rotating shaft 251 and two rollers 252, and two supporting plates 212 are extended upward from the bottom side of the fixed plate 211, the rotating shaft 251 is rotatably connected to the two supporting plates 212, and the two rollers 252 are sleeved on the rotating shaft 251. In this embodiment, the two rollers 252 are supported on the first supporting rail 311, which can increase the stability of the movement of the lifting and moving frame 200.
[0032] Further, refer to Figure 3The bottom end of a support plate 212 is provided with an extension portion 213 extending downward, and the bottom end of the extension portion 213 is provided with a stopper portion 214, which is limited on one side of the support rail 311. In this embodiment, the position of the frame 210 and the support rail can be ensured by limiting the stopper portion 214, and the problem of the support pulley 250 derailing can be prevented when moving from the first support rail 311 to the second support rail.
[0033] Further, refer to Figure 1 and Figure 2 , the lifting mechanism 300 also includes a third rack 320, a mounting seat 330, a reducer 340, a second transmission shaft 350 and a second gear 360. The two third racks 320 are arranged on both sides of the support frame 100, and the two mounting seats 330 are slidably connected to the corresponding guide rails 101. The carrier plate 310 is connected to the two mounting seats 330, the reducer 340 is arranged on the bottom side of the carrier plate 310, the second transmission shaft 350 is connected to the reducer 340, and the two ends of the second transmission shaft 350 are provided with second gears 360, and the second gear 360 is meshed with the corresponding third rack 320. In this embodiment, the reducer 340 drives the second transmission shaft 350 to rotate, and under the meshing of the second gear 360 and the third rack 320, the frame 210 moves up and down, so that the lifting and moving frame 200 is lifted and lowered as a whole.
[0034] Further, refer to Figure 1 The support frame 100 is also provided with a support cylinder 120, which is used to extend into the bottom side of the carrier plate 310 and support the carrier plate 310. When the carrier plate 310 of the lifting mechanism 300 is lifted and does not need to move up and down, the support cylinder 120 can extend to the bottom side of the carrier plate 310, thereby supporting the carrier plate 310.
[0035] For further information, please refer to Figure 3 and Figure 4 , an embodiment of a battery clamped by a clamping mechanism 400, specifically, the clamping mechanism 400 includes a lifting frame 410, a plurality of clamping assemblies 420, two lifting mechanisms 430 and a power mechanism 440. A group of lifting mechanisms 430 are respectively connected to both ends of the lifting frame 410, and the lifting mechanisms 430 are arranged on the bottom side of the frame 210. The power mechanism 440 is connected to the lifting mechanism 430, and is used to drive the lifting mechanism 430 to drive the lifting frame 410 to lift and lower. The clamping assembly 420 is arranged on the bottom side of the lifting frame 410. In this embodiment, the lifting frame 410 and the clamping assembly 420 can be driven by the lifting mechanism 430 to move up and down, so that the clamping assembly 420 can clamp the battery and clamp the battery to move upward from the corresponding clamp.
[0036] Further, refer to Figure 3The lifting mechanism 430 includes a bottom plate 431, a guide column 432, a screw assembly 433 and an adjusting rod 434. The two guide columns 432 and the screw assembly 433 are vertically arranged between the bottom plate 431 and the frame 210 and connected to the lifting frame 410. The adjusting rod 434 obliquely connects the bottom plate 431 and the frame 210. The adjusting rod 434 includes a screw rod 435 and a nut 436 arranged at both ends of the screw rod 435. The nut 436 has a connecting end, and the connecting end is pivotally connected to the bottom plate 431 or the frame 210. The power mechanism 44 is a motor assembly connected to the screw assembly 433. In this embodiment, the motor assembly drives the screw in the screw assembly 433 to rotate, so that the nut in the screw assembly 433 moves up and down, and then the lifting frame 410 can be driven to move up and down. In addition, the vertical angle between the guide column 432 and the screw assembly 433 can be adjusted by the adjusting rod 434, so that the lifting frame 410 moves up and down more smoothly. Specifically, by changing the length of the adjustment rod 434 , the horizontal angle of the bottom plate 431 can be adjusted, thereby adjusting the vertical angle of the guide column 432 and the screw assembly 433 .
[0037] Further, refer to Figures 3 to 5 The clamping assembly 420 includes a connection seat 421, a clamping member 422 and a pressing plate 423, and multiple groups of clamping members 422 are arranged in sequence. The connection seat 421 is provided with a first installation cavity 424 and a second installation cavity 425 distributed up and down, and a partition plate 426 is arranged between the first installation cavity 424 and the second installation cavity 425.
[0038] Reference Figure 5 The clamping member 422 includes two clamping plates 4220, a guide shaft 4221, a compression spring 4222 and a connecting rod 4223. The two clamping plates 4220 are cross-arranged and pivotally connected in the second mounting cavity 425. The guide shaft 4221 slides through the partition plate 426, and a limiting portion 4224 is provided at the upper end of the guide shaft 4221. The compression spring sleeve 4222 is on the upper end of the guide shaft 4221 and is limited between the partition plate 426 and the limiting portion 4224. A connecting rod 4223 is connected between the lower end of the guide shaft 4221 and the two clamping plates 4220, and the two ends of the connecting rod 4223 are pivotally connected to the clamping plates 4220 and the guide shaft 4221 respectively; the pressure plate 423 is arranged in the first mounting cavity 424 and connected to the upper end of each guide shaft 4221. In this embodiment, when the battery needs to be clamped or released, the pressure plate 423 is pressed down by the power unit, so that the guide shaft 4221 overcomes the elastic force of the compression spring 4222 and moves downward. When the guide shaft 4221 moves downward, the connecting rod 4223 pushes the clamping plate 4220 to rotate, and then pushes the two clamping plates 4220 to open, so that the battery can be clamped or released.
[0039] For further information, please refer to Figure 3 and Figure 4The clamping mechanism 400 further includes an adjusting mechanism 450 . Two groups of clamping assemblies 420 are slidably connected to the bottom side of the lifting frame 410 . The adjusting mechanism 450 connects the two clamping assemblies 420 to adjust the distance between the two clamping assemblies 420 .
[0040] Reference Figure 3 and Figure 4 , the adjustment mechanism 450 includes a connecting plate 451, an adjustment motor 452, a driving gear 453 and an adjustment slide 454. The connecting plate 451 is arranged on the lifting frame 410, and two adjustment slides 454 are relatively slidably arranged on the connecting plate 451, and a plurality of meshing teeth 456 are arranged on opposite sides of the two adjustment slides 454. The adjustment motor 452 is arranged on the bottom side of the connecting plate 451, and the driving gear 453 is arranged on the adjustment motor 452 and meshes with the meshing teeth 456. One end of the adjustment slide 454 is connected to the corresponding connecting seat 421. In this embodiment, the adjustment motor 452 drives the driving gear 453 to rotate, and the driving gear 453 meshes with the meshing teeth 456, so that the adjustment slide 454 can be driven to slide. When the adjustment slide 454 slides, the connecting seat 421 can be driven to move, thereby adjusting the spacing between the two clamping assemblies 420, so that the clamping and transfer of batteries of different sizes can be satisfied.
[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A transfer robot structure, comprising a support frame, a fixed frame and a lifting and moving frame; the two support frames are arranged opposite to each other, and the two fixed frames are arranged opposite to each other and are located at one end of the support frame; characterized in that: Guide rails and lifting mechanisms are provided on opposite sides of the two support frames; the lifting mechanism includes a carrier plate, on which a first supporting slide rail and a first rack are provided; the fixed frame has a two-layer supporting structure, each of which is provided with a second rack and a second supporting slide rail; the lifting and moving frame includes a frame, a motor, a transmission shaft and a first gear; support pulleys are provided at both ends of the frame and are supported on the corresponding first supporting slide rails; the motor is provided on the frame, the transmission shaft is rotatably connected to one side of the frame, and the two ends of the transmission shaft extend toward the top of the support frame, and the first gear is provided at both ends of the transmission shaft, the first gear is meshed with the first rack or the second rack, and the motor is connected to the transmission shaft for driving the transmission shaft to rotate; a clamping mechanism is provided on the bottom side of the frame.
2. The transfer robot structure according to claim 1, characterized in that: Fixed plates are provided at both ends of the frame, and two groups of supporting pulleys are provided at the bottom of the fixed plates; the supporting pulleys include a rotating shaft and two rollers, two supporting plates extend upward from the bottom side of the fixed plate, the rotating shaft rotatably connects the two supporting plates, and the two rollers are sleeved on the rotating shaft.
3. The transfer robot structure according to claim 2 is characterized in that: An extending portion extending downward is provided at the bottom end of the support plate, and a blocking portion extends from the bottom end of the extending portion and is limited on one side of the support slide rail.
4. The transfer robot structure according to claim 1, characterized in that: The lifting mechanism also includes a third rack, a mounting seat, a reducer, a second transmission shaft and a second gear; the two third racks are arranged on both sides of the support frame, and the two mounting seats are slidably connected to the corresponding guide rails; the carrier plate is connected to the two mounting seats, the reducer is arranged on the bottom side of the carrier plate, the second transmission shaft is connected to the reducer, and the second gears are arranged at both ends of the second transmission shaft, and the second gears are meshed with the corresponding third racks.
5. The transfer robot structure according to any one of claims 1 to 4, characterized in that: The support frame is also provided with a support cylinder, and the support cylinder is used to extend into the bottom side of the carrier plate and support the carrier plate.
6. The transfer robot structure according to any one of claims 1 to 4, characterized in that: The clamping mechanism includes a lifting frame, several groups of clamping components, two lifting mechanisms and a power mechanism; one group of the lifting mechanisms is connected to each end of the lifting frame, and the lifting mechanisms are arranged on the bottom side of the frame; the power mechanism is connected to the lifting mechanisms and is used to drive the lifting mechanisms to drive the lifting frame to move up and down; the clamping components are arranged on the bottom side of the lifting frame.
7. The transfer robot structure according to claim 6, characterized in that: The lifting mechanism includes a base plate, a guide column, a screw assembly and an adjusting rod. The two guide columns and the screw assembly are vertically arranged between the base plate and the frame and connected to the lifting frame. The adjusting rod obliquely connects the base plate and the frame. The adjusting rod includes a screw and nuts arranged at both ends of the screw. The nut has a connecting end, and the connecting end is pivotally connected to the base plate or the frame. The power mechanism is a motor assembly connected to the screw assembly.
8. The transfer robot structure according to claim 6, characterized in that: The clamping assembly includes a connecting seat, a clamping member and a pressing plate, and multiple groups of clamping members are arranged in sequence; the connecting seat is provided with a first installation cavity and a second installation cavity distributed up and down, and a partition is provided between the first installation cavity and the second installation cavity; The clamping member includes two clamping plates, a guide shaft, a compression spring and a connecting rod; the two clamping plates are cross-arranged and pivotally connected in the second mounting cavity; the guide shaft slides through the partition, and a limiting portion is provided at the upper end of the guide shaft, and the compression spring is sleeved on the upper end of the guide shaft and limited between the partition and the limiting portion; the connecting rod is connected between the lower end of the guide shaft and the two clamping plates, and the two ends of the connecting rod are respectively pivotally connected to the clamping plates and the guide shaft; the pressure plate is arranged in the first mounting cavity and connected to the upper end of each guide shaft.
9. The transfer robot structure according to claim 8, characterized in that: The clamping mechanism further includes an adjusting mechanism, and two groups of the clamping assemblies are slidably connected to the bottom side of the lifting frame, and the adjusting mechanism connects the two clamping assemblies to adjust the distance between the two clamping assemblies; The adjustment mechanism includes a connecting plate, an adjusting motor, a driving gear and an adjusting slide; the connecting plate is arranged on the lifting frame, and the two adjusting slides are relatively slidably arranged on the connecting plate, and the opposite sides of the two adjusting slides are provided with a plurality of meshing teeth; the adjusting motor is arranged on the bottom side of the connecting plate, and the driving gear is arranged on the adjusting motor and meshes with the meshing teeth; one end of the adjusting slide is connected to the corresponding connecting seat.