A fixed-arm hoisting type intensive battery swap station

Abstract

The application discloses a fixed-arm hoisting type intensive battery swap station and relates to the technical field of battery swap stations.The battery swap station comprises a storage layer and a conveying layer.The storage layer comprises a first support frame, and the first support frame is provided with a plurality of battery brackets for placing battery boxes.The conveying layer comprises a moving frame, the moving frame is slidingly arranged along the arrangement direction of the battery brackets, and the moving frame overhangs the first support frame in a direction perpendicular to the sliding direction of the moving frame.A moving module is arranged on the moving frame, and a hoisting module is arranged on the moving module.The battery swap station has the advantages that the conveying layer and the storage layer are arranged, the battery boxes in the storage layer are compactly arranged, the hoisting module in the conveying layer can hoist the battery boxes for replacement, the operation is convenient, the conveying layer and the storage layer are arranged in a stacking mode, the space utilization rate is improved, the vertical space is fully utilized, and the problem of excessively large occupied area is solved.

Description

TECHNICAL FIELD

[0001] The application discloses a fixed-arm hoisting type intensive battery replacement station and relates to the technical field of battery replacement. BACKGROUND

[0002] With the increasing maturity of electric vehicles, the use environment is extended from small business passenger vehicles to various field operation vehicles. Industrial heavy trucks are also a type of electric vehicles, and the automatic replacement technology of battery packs as power sources is also improving.

[0003] The existing heavy truck battery replacement equipment on the market generally adopts a ceiling track hoisting type installation method. For example, the technical scheme disclosed in Chinese Patent Literature (application number: 2022219250988, patent name: a container type L-shaped heavy truck battery replacement station) is as follows: a battery replacement frame and a battery box are included, the battery box is arranged inside the battery replacement frame, a control box is arranged below the battery box, the battery replacement frame is a box type frame, a suspended corner frame is arranged on the upper portion of one side of the battery replacement frame, the corner frame is in an L shape with the battery replacement frame, a battery charging bottom support is arranged at the inner bottom portion of the battery box, the battery charging bottom support is connected to the control box, an arc-shaped ceiling track is arranged at the inner top portion of the battery replacement frame and the inner top portion of the corner frame, an intelligent crane is arranged to slide on the arc-shaped ceiling track, a rotary lifting appliance is arranged below the intelligent crane, the L-shaped heavy truck battery replacement station is used to make the heavy truck and the battery replacement station used in parallel, the battery replacement is bent out from the arc of the arc-shaped ceiling track, and the rotary mode of the rotary lifting appliance is set as a worm and gear structure to cooperate with a gripper to satisfy the replacement of the battery.

[0004] However, the ceiling track hoisting type installation structure has the characteristics of complex installation and large space occupation. The commonly used portal battery replacement station has a track laying and a battery in the same plane, and the plane space utilization rate is low, which cannot meet the requirements of areas with a lack of land.

[0005] Based on the above reasons, a fixed-arm hoisting type intensive battery replacement station is needed to overcome the above problems. SUMMARY

[0006] In view of the above, the application provides a fixed-arm hoisting type intensive battery replacement station, which includes a conveying layer and a storage layer below. The battery boxes in the storage layer are arranged compactly, the hoisting module in the conveying layer can hoist the battery boxes for replacement, the operation is convenient, the stacking of the conveying layer and the storage layer can improve the space utilization rate, fully utilize the vertical space, and solve the problem of excessive land occupation.

[0007] In order to solve the above technical problems, the application is realized by the following technical scheme:

[0008] The application discloses a fixed-arm hoisting type intensive battery swap station, which comprises a storage layer and a conveying layer.

[0009] The conveying layer comprises a moving frame which is slidingly arranged along the arrangement direction of the battery carriers and vertically projects out of the first support frame in the direction perpendicular to the sliding direction of the moving frame; the moving frame is provided with a moving module, and the moving module is provided with a hoisting module which is matched with the battery box.

[0010] Further, the moving frame is located above the first support frame; the first support frame is provided with a first guide rail, and the moving frame is slidingly connected to the first guide rail.

[0011] Alternatively, the first support frame is provided with a second support frame above the first support frame, the second support frame is provided with a first guide rail, and the moving frame is slidingly connected to the first guide rail.

[0012] Further, the moving frame is provided with a first translation module which is used for driving the moving frame to move relative to the first support frame.

[0013] Further, the first translation module comprises a first chain and a first translation motor; the first translation motor is arranged on the moving frame, the output shaft of the first translation motor is connected with a first sprocket, the first chain extends along the sliding direction of the moving frame and is fixed at both ends, and the middle part of the first chain is wound around the first sprocket; the first translation motor drives the moving frame to move by engaging the first chain through the first sprocket.

[0014] Further, the moving module comprises a plate frame which is provided with a second translation module; the second translation module is used for driving the plate frame to move relative to the moving frame in the direction perpendicular to the moving direction of the moving frame; the moving frame is provided with a second guide rail, and the plate frame is provided with a second sliding block which is slidingly connected to the second guide rail.

[0015] Further, the second translation module comprises a second chain and a second translation motor; the two ends of the second chain are fixed, and the arrangement direction of the second chain is perpendicular to the arrangement direction of the first chain; the second translation motor is connected with a second sprocket, the second chain is wound around the second sprocket, and the second translation motor drives the plate frame to move by engaging the second chain through the second sprocket.

[0016] Further, the lifting module comprises a lifting motor, a winding roller, a pulley block and a lifting hook plate, the lifting motor is connected with the input end of the third speed reducer, the output end of the third speed reducer is connected with the winding roller, the winding roller is wound with a traction rope, the traction rope is connected to the lifting hook plate through the pulley block.

[0017] Further, the bottom surface of the lifting hook plate is provided with a lifting hook handle, and the top of the battery box is provided with a horizontal plate, and the lifting hook handle is matched with the horizontal plate.

[0018] Further, one side of the first support frame is provided with a maintenance station, and the other side is provided with a control cabinet; a rain eave is arranged above the first support frame and the moving frame.

[0019] Further, the moving frame comprises a top frame and a plurality of supporting legs, the upper end of the supporting leg is fixedly connected with the top frame, the lower end of the supporting leg is fixedly connected with a bottom plate, the bottom of the bottom plate is provided with a first sliding block, and the first sliding block is slidably connected to the first guide rail; the first reinforcing rod and the second reinforcing rod are arranged, one end of the first reinforcing rod is fixedly connected with the supporting leg, and the other end of the first reinforcing rod is fixedly connected with the adjacent supporting leg; one end of the second reinforcing rod is fixedly connected with the supporting leg, and the other end of the second reinforcing rod is welded with the top frame.

[0020] Further, the moving frame comprises a top frame and a frame body, the top frame is slidably connected to the frame body, the top frame is provided with a rack, and the length direction of the rack is the same as the sliding direction of the top frame on the frame body; the frame body is provided with a telescopic drive motor, the telescopic drive motor is connected with a gear, and the gear is meshedly connected with the rack.

[0021] Further, the front end of the lifting hook handle is formed in an upwardly curved shape.

[0022] The beneficial effects of the present application are:

[0023] The present application comprises a conveying layer and a storage layer below, the storage layer is fixed on the ground, and the conveying layer is installed above the storage layer, without the need for installing a ceiling rail as in the traditional equipment, the structure is simple, and the installation is convenient; in addition, the battery boxes in the storage layer are arranged compactly, the lifting module in the conveying layer can lift the battery boxes for replacement, the operation is convenient, and the stacking of the conveying layer and the storage layer can improve the space utilization, fully utilize the vertical space, solve the problem of too large floor area, and the structure is ingenious. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments, the following will briefly introduce the drawings required to be used in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art without creative labor based on these drawings.

[0025] Figure 1 is a perspective view of the battery swap station provided by an embodiment of the present disclosure.

[0026] Figure 2 is a perspective view of the power storage layer provided by an embodiment of the present disclosure.

[0027] Figure 3 is a perspective view of the conveying layer provided by an embodiment of the present disclosure.

[0028] Figure 4 is a structural schematic view of the lifting module and the battery box provided by an embodiment of the present disclosure.

[0029] Figure 5 is a perspective view of the plate frame and the components above it provided by an embodiment of the present disclosure.

[0030] Figure 6 is a perspective view of the translation module provided by an embodiment of the present disclosure.

[0031] Figure 7 is a perspective view of the lifting hook plate provided by an embodiment of the present disclosure.

[0032] Figure 8 is a perspective view of the battery box provided by an embodiment of the present disclosure.

[0033] Figure 9 is a perspective view of another structural mode of the battery swap station provided by an embodiment of the present disclosure.

[0034] Figure 10 is Figure 9 is a perspective view of another structural mode of the moving frame provided by an embodiment of the present disclosure.

[0035] Main element symbol explanation

[0036]

[0037]

[0038] The following specific embodiments will further illustrate the present disclosure in combination with the above drawings. Specific embodiments

[0039] In order to enable a more clear understanding of the above-mentioned objects, features and advantages of the present disclosure, the present disclosure will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the present disclosure. The described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure.

[0041] In various embodiments, for the purpose of facilitating description without limiting the present disclosure, the term "connected" used in the patent application specification and claims of the present disclosure is not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "below", "left", "right", and the like are only used to represent relative positional relationships, which change accordingly when the absolute position of the described object changes.

[0042] Embodiment one

[0043] As shown in Figures 1 to 8 The fixed-arm hoisting intensive battery swap station includes a storage layer 1 and a conveying layer 2, the storage layer 1 is located below, and the conveying layer 2 is located above. The storage layer 1 includes a first support frame 101, which is fixed to the ground. The first support frame 101 is provided with a plurality of battery racks 102 for placing battery boxes 103. The battery racks 102 are provided with charging modules and are used to charge the battery boxes 103. When the battery boxes 103 are placed on the battery racks 102 as shown in Figure 1 or Figure 2 The charging port of the battery rack 102 is connected to the charging port of the battery box 103, so that the battery rack 102 charges the battery box 103.

[0044] The conveying layer 2 comprises a moving frame 201 which is slidingly arranged along the arrangement direction of the battery bracket 102 and overhangs the first support frame 101 in a direction perpendicular to the sliding direction of the moving frame 201. In some embodiments, the moving frame 201 is fixed overhang, i.e. part of the structure of the moving frame 201 overhangs the first support frame 101 in the direction perpendicular to the sliding direction. In other embodiments, the moving frame 201 can also be movable overhang, i.e. part of the structure of the moving frame 201 can move to overhang the first support frame 101 during the battery replacement process, and can also be retracted without overhanging the first support frame 101 in the non-working state. The moving frame 201 is provided with a moving module, and the moving module is provided with a lifting module which is used in matching with the battery box 103.

[0045] Specifically, when the heavy truck 24 with the battery box 103 to be replaced arrives at the front of the storage layer 1, the lifting module on the conveying layer 2 lifts away the battery box 103 on the heavy truck 24 and sends it into the battery bracket 102 of the storage layer 1 for charging, and then lifts out the battery box 103 which has been fully charged in the other battery bracket 102 and sends it to the heavy truck 24, thereby completing the replacement.

[0046] The first support frame 101 is provided with a first guide rail 3, and the moving frame 201 is slidingly connected to the first guide rail 3. The moving frame 201 is provided with a first translation module which is used to drive the moving frame 201 to move relative to the first support frame 101.

[0047] The first translation module comprises a first chain 4 and a first translation motor 5. The first translation motor 5 is arranged on the moving frame 201, and the output shaft of the first translation motor 5 is connected to a first sprocket 8. The first chain 4 extends along the sliding direction of the moving frame 201 and is fixed at both ends, and the middle part passes through the first sprocket 8. The first translation motor 5 drives the moving frame 201 to move by engaging the first chain 4 through the first sprocket 8. When the first translation motor 5 drives the first sprocket 8 to rotate, the first sprocket 8 will move along the first chain 4, thereby causing the moving frame 201 to move relative to the first support frame 101.

[0048] As a further preferred embodiment, a reduction gearbox and a synchronous shaft can be added to increase torque and synchronous driving. For example, the first translation motor 5 can be connected to the input end of a first reduction gearbox 6, and the output end of the first reduction gearbox 6 can be connected to a first synchronous shaft 7. The two ends of the first synchronous shaft 7 are connected to a first sprocket 8, which is connected to the first chain 4. In this embodiment, the first reduction gearbox 6 is an expansion reducer. The first translation motor 5 drives the rotation of the first synchronous shaft 7 through the first reduction gearbox 6, which drives the rotation of the first sprocket 8, thereby enabling the first sprocket 8 to move along the first chain 4. Since the first chain 4 is arranged in the same direction as the first guide rail 3, the moving frame 201 moves left and right under the action of the first translation module.

[0049] The moving module includes a plate frame 9, and a second translation module is arranged on the plate frame 9. The second translation module is used to drive the plate frame 9 to move relative to the moving frame 201 in a direction perpendicular to the moving direction of the moving frame 201.

[0050] The second translation module includes a second chain 10 and a second translation motor 11. The two ends of the second chain 10 are fixedly connected to the top ends of the moving frame 201, and the arrangement direction of the second chain 10 is perpendicular to the arrangement direction of the first chain 4. The second translation motor 11 is connected to a second sprocket 14, and the second chain 10 passes around the second sprocket 14. The second translation motor 11 drives the plate frame 9 to move by engaging the second chain 10 through the second sprocket 14. Similar to the movement mode of the first translation module, the second translation motor 11 drives the second sprocket 14 to rotate, enabling the second sprocket 14 to move along the second chain 10, thereby achieving the purpose of moving the plate frame 9 on the top of the moving frame 201.

[0051] As a further preferred embodiment, a reduction gearbox and a synchronous shaft can be added to increase torque and synchronous driving. For example, the second translation motor 11 can be connected to the input end of a second reduction gearbox 12, and the output end of the second reduction gearbox 12 can be connected to a second synchronous shaft 13. The two ends of the second synchronous shaft 13 are connected to a second sprocket 14, which is connected to the second chain 10. The second translation motor 11 and the second reduction gearbox 12 are fixedly connected to the plate frame 9.

[0052] The structure and working principle of the second translation motor 11 are the same as those of the first translation module. The second reduction gearbox 12 is also an expansion reducer. The top of the moving frame 201 is provided with a second guide rail 2017, and the plate frame 9 is provided with a second sliding block 901, which is slidingly connected to the second guide rail 2017. The second translation motor 11 drives the second sprocket 14 to move along the second chain 10 through the second reduction gearbox 12, thereby enabling the plate frame 9 to move forward and backward on the moving frame 201.

[0053] The lifting module comprises a lifting motor 15, a winding roller 16, a pulley block 17 and a hook plate 18. The lifting motor 15 is connected with the input end of a third speed reducer 19. The output end of the third speed reducer 19 is connected with the winding roller 16. In this embodiment, the third speed reducer 19 is a double-shaft output speed reducer. Both output shafts of the third speed reducer 19 are connected with the winding roller 16. The traction rope 20 is wound on the winding roller 16. The traction rope 20 is connected to the hook plate 18 along the pulley block 17. Therefore, the lifting motor 15 controls the rotation of the winding roller 16 through the third speed reducer 19 to control the unwinding or winding of the traction rope 20, so as to pull the lifting of the hook plate 18. The bottom surface of the hook plate 18 is provided with a hook handle 1801. The top of the battery box 103 is provided with a horizontal plate 1031. The hook handle 1801 is matched with the horizontal plate 1031. Specifically, combined with Figure 7 and Figure 8 When the battery box 103 is lifted, the hook plate 18 is first lowered to an appropriate height by the lifting motor 15, so that the hook handle 1801 is slightly lower than the horizontal plate 1031 of the battery box 103. At this time, the second translation motor 11 controls the forward movement of the plate frame 9, that is, the hook handle 1801 is inserted below the horizontal plate 1031. At this time, the hook plate 18 is lifted by the lifting motor 15, so that the battery box 103 can be lifted. The battery box 103 can be lowered by reversing the above operation.

[0054] As shown in Figure 7 , the front end of the hook handle 1801 is formed in an upwardly curved shape. This allows the front end of the hook handle 1801 to be upwardly curved when the battery box 103 is lifted, so that the front end of the hook handle 1801 is limited by the horizontal plate 1031, avoiding the battery box 103 from sliding outwards, which helps to improve the stability of the operation.

[0055] The first support frame 101 is provided with a maintenance workbench 21 on one side and a control cabinet 22 on the other side. The circuit of the battery bracket 102 is connected with the control cabinet 22. The maintenance workbench 21 is used to place maintenance tools. The control cabinet 22 and the maintenance workbench 21 are arranged on the left and right sides of the first support frame 101, which is convenient for the operator to maintain the equipment daily. The first support frame 101 and the moving frame 201 are provided with a rain eave 23 above, which has the effect of blocking rain.

[0056] The moving frame 201 comprises a top frame 2011 and a plurality of supporting legs 2012, the second guide rail 2017 and the moving module are located on the top frame 2011, the upper end of the supporting leg 2012 is welded with the top frame 2011, the lower end of the supporting leg 2012 is welded with a bottom plate 2013, the first translation motor 5 and the first speed reducer 6 are fixed on the bottom plate 2013, the bottom of the bottom plate 2013 is provided with a first sliding block 2014, the first sliding block 2014 is slidably connected with the first guide rail 3; the moving frame 201 is slidably connected with the first guide rail 3 of the first supporting frame 101 through the first sliding block 2014; comprising a first reinforcing rod 2015 and a second reinforcing rod 2016, one end of the first reinforcing rod 2015 is welded with the supporting leg 2012, the other end of the first reinforcing rod 2015 is welded with the adjacent supporting leg 2012; the first reinforcing rod 2015 is used for enhancing the stability of the connection between the supporting legs 2012; one end of the second reinforcing rod 2016 is welded with the supporting leg 2012, one end of the second reinforcing rod 2016 is welded with the top frame 2011; the second reinforcing rod 2016 is used for enhancing the stability of the connection between the supporting leg 2012 and the top frame 2011, so that the moving frame 201 has high overall supportability.

[0057] Embodiment two

[0058] As shown in Figure 9 and Figure 10 , it is a perspective view of another structural mode of the battery swap station, in this structure, the layout mode of the storage layer 1 and the conveying layer 2 is different, and the structural mode of the moving frame 201 is also different. Specifically, the storage layer 1 still comprises a first supporting frame 101, the first supporting frame 101 is fixed on the ground, the first supporting frame 101 is provided with a plurality of battery cradles 102 for placing the battery box 103; the upper side of the first supporting frame 102 is provided with a second supporting frame 104, the second supporting frame 104 is provided with the first guide rail 3, the moving frame 201 is slidably connected with the first guide rail 3; the moving frame 201 is driven to slide on the first guide rail 3 by the first translation module, and the structure is the same as that of embodiment one.

[0059] The moving frame 201 comprises a top frame 2011, a frame body 2018 and a driving mechanism, the moving module and the lifting module are located on the top frame 2011, the top frame 2011 is slidingly connected to the frame body 2018, the driving mechanism comprises a rack 2019 arranged on the top frame 2011 and a telescopic driving motor 2020 arranged on the frame body 2018. The length direction of the rack 2019 is the same as the sliding direction of the top frame 2011 on the frame body 2018, the telescopic driving motor 2020 is connected with a gear 2021, the telescopic driving motor 2020 drives the gear 2021 to rotate, the gear 2021 is meshingly connected with the rack 2019, so it can be known from the above structure that when the telescopic driving motor 2020 drives the gear 2021 to rotate, the top frame 2011 can slide on the frame body 2018 through the interaction of the gear 2021 and the rack 2019.

[0060] In this layout, the battery box 103 on the first support frame 101 is located at the rear, the heavy truck 24 is located at the front, the second support frame 104 is located in the middle, the top frame 2011 moves backward on the frame body 2018 to the upper side of the first support frame 101, and the battery box 103 is lifted through the cooperation of the moving module and the lifting module; then the top frame 2011 moves forward on the frame body 2018 to the upper side of the heavy truck 24, and the battery box 103 is lowered to the heavy truck 24 through the cooperation of the moving module and the lifting module, thereby completing the battery replacement work.

[0061] In the several embodiments provided in the present disclosure, it is apparent that the present disclosure is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present disclosure. Therefore, the embodiments should be considered as exemplary and not limiting, and the scope of the present disclosure is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be included in the present disclosure. In addition, it is clear that the word "comprise" does not exclude other units or steps, and the singular does not exclude the plural. The words "first", "second" and the like are used to indicate names and do not mean any particular order.

[0062] The above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit it, although the present disclosure has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present disclosure can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure.

Claims

1. A fixed-arm hoisting type intensive battery swapping station, characterized in that, The system includes a storage layer and a conveying layer. The storage layer includes a first support frame with several battery trays for placing battery boxes. The conveying layer includes a movable frame that slides along the arrangement direction of the battery trays and extends out of the first support frame perpendicular to its sliding direction. A movable module and a lifting module are mounted on the movable frame and used in conjunction with the battery boxes. The movable frame is located above the first support frame. A first guide rail is mounted on the first support frame, and the movable frame is slidably connected to the first guide rail. The storage layer is fixed to the ground, and the conveying layer is installed above it. Battery boxes are arranged and placed within the storage layer.

2. The fixed-arm hoisting integrated battery swapping station according to claim 1, characterized in that, The movable frame is equipped with a first translation module, which is used to drive the movable frame to move relative to the first support frame.

3. A fixed-arm hoisting integrated battery swapping station according to claim 2, characterized in that, The first translation module includes a first chain and a first translation motor. The first translation motor is disposed on the moving frame. The output shaft of the first translation motor is connected to a first sprocket. The first chain extends along the sliding direction of the moving frame and is fixed at both ends, with the middle part passing around the first sprocket. The first translation motor drives the moving frame to move by engaging the first chain through the first sprocket.

4. A fixed-arm hoisting integrated battery swapping station according to claim 3, characterized in that, The moving module includes a plate frame, on which a second translation module is provided. The second translation module is used to drive the plate frame to move relative to the moving frame in a direction perpendicular to the moving direction of the moving frame. The moving frame is provided with a second guide rail, and the plate frame is provided with a second slider, which is slidably connected to the second guide rail.

5. A fixed-arm hoisting integrated battery swapping station according to claim 4, characterized in that, The second translation module includes a second chain and a second translation motor. The two ends of the second chain are fixed, and the setting direction of the second chain is perpendicular to the setting direction of the first chain. The second translation motor is connected to a second sprocket, and the second chain passes around the second sprocket. The second translation motor drives the plate frame to move by engaging the second chain through the second sprocket.

6. A fixed-arm hoisting integrated battery swapping station according to claim 1, characterized in that, The lifting module includes a lifting motor, a winding roller, a pulley block, and a hook plate. The lifting motor is connected to the input end of a third reduction gearbox, and the output end of the third reduction gearbox is connected to the winding roller. A traction rope is wound on the winding roller, and the traction rope is connected to the hook plate along the pulley block.

7. A fixed-arm hoisting integrated battery swapping station according to claim 6, characterized in that, The bottom surface of the hook plate is provided with a hook handle, and the top of the battery box is provided with a horizontal plate. The hook handle is used in conjunction with the horizontal plate.

8. A fixed-arm hoisting integrated battery swapping station according to claim 7, characterized in that, The movable frame includes a top frame, a frame body, and a driving mechanism. The top frame is movably connected to the frame body, and the driving mechanism is used to drive the top frame to move relative to the frame body.

9. A fixed-arm hoisting integrated battery swapping station according to claim 8, characterized in that, The driving mechanism includes a rack disposed on the top frame, the length direction of the rack being the same as the sliding direction of the top frame on the frame body; a telescopic drive motor is disposed on the frame body, the telescopic drive motor being connected to a gear, and the gear being meshed with the rack.

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