Limiting mechanism for improving lifting stability of battery transfer equipment and battery transfer equipment

Abstract

The invention provides a limiting mechanism for improving the lifting stability of battery transfer equipment and the battery transfer equipment, and the limiting mechanism comprises a plurality of back wheel sets which are arranged in one-to-one correspondence with a plurality of gear and rack transmission units and fixed at preset positions of a battery taking and placing mechanism so as to position the positions of gears and racks in each gear and rack transmission unit; each back wheel set comprises two back wheels which are attached to the back face of the corresponding rack at a preset angle and the side face, facing the battery taking and placing mechanism, of the rack. According to the limiting mechanism for improving the lifting stability of the battery transfer equipment and the battery transfer equipment, the whole battery taking and placing mechanism enables the gears to be attached to the corresponding racks through the back wheel sets at multiple positions, stable lifting of the battery taking and placing mechanism is achieved, the lifting performance is improved, and the situation that the gears and the racks are disengaged is avoided; the structure is simple and cost is low.

Description

[0001] This application is a division of a Chinese invention patent with an application date of December 2, 2021, application number 202111460206.9, and name “Limiting mechanism and battery transfer equipment for improving the lifting stability of battery transfer equipment”. Technical Field

[0002] The present invention relates to the field of battery swap stations, and in particular to a limiting mechanism and a battery transporting device for improving the lifting stability of a battery transporting device. Background Art

[0003] As the battery charging time of electric vehicles is limited, quick-swap electric vehicles have been accepted by more and more users. It only needs to replace the depleted battery pack and install a fully charged battery pack in the battery swap station or energy storage station, saving a long battery charging time. The battery swap station or energy storage station is equipped with: battery swap equipment for battery removal or installation, battery transfer equipment for transferring battery packs, and charging equipment for charging battery packs.

[0004] The existing battery transfer device usually realizes lifting and moving through a guide mechanism, a transmission mechanism and a drive mechanism, so as to transfer the battery between the battery positions. The Chinese patent application with publication number CN110901601A discloses an AGV charging station, which adopts the principle of multi-axis linkage and the design of a multi-axis system, specifically exchanges and charges the battery in the X-axis, Y-axis, Z-axis and the direction of battery pulling and pushing, removes the battery from the AGV trolley and puts the battery into the load-bearing frame. The Chinese patent application with publication number CN106043247A discloses a modular and expandable battery exchange station or energy storage station equipment and a charging rack, in which the battery storage modules in the charging rack are stacked together in a building block manner, and the battery transfer device can travel through the battery storage module. After the battery transfer device carries the battery to the vacant battery storage module position inside the charging rack, the lifting device lifts the battery transfer platform upward, and the battery transfer platform drives the battery placed thereon to move vertically upward, and the battery is fixed in the battery storage layer through the battery locking mechanism, and then the battery is charged by the electrical layer. A Chinese patent application with publication number CN208181025U discloses a battery bin and a new energy vehicle battery swap station, wherein a lift can dock and transfer batteries between an RGV trolley and a battery rack. When replacing batteries for new energy vehicles, the battery transfer device of the lift can transfer batteries between the new energy vehicle and the battery rack along the Y direction, can transfer batteries to the battery rack along the X direction or dock batteries from the battery rack, and the lifting platform itself can lift batteries along the Z direction so that the batteries are horizontally aligned with the battery rack or the new energy vehicle.

[0005] However, the existing transfer device generally drives the car to move up and down through a sprocket chain transmission method, so as to correspond to the battery compartment at any height position, which is convenient for taking and placing the battery pack. Due to the heavy weight of the battery pack, if the car carrying the battery pack is moved up and down through a gear rack transmission method, it is easy to cause the gear and rack to disengage, and the car cannot be driven up and down, causing damage to the gear rack structure, which is not conducive to the normal operation of the battery transfer device. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the battery transfer device in the battery swap station adopts a gear rack transmission method to achieve lifting and lowering, which is easy to cause gear rack disengagement or even damage, and to provide a limiting mechanism and battery transfer equipment that improves the lifting stability of the battery transfer equipment.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A limiting mechanism for improving the lifting stability of a battery transport device, wherein the battery transport device is arranged near a battery rack having a plurality of battery packs, the battery transport device comprises a mounting portion arranged near the battery rack, a battery pick-up and placement mechanism for picking up and placing batteries relative to any battery position of the battery rack, and a transmission mechanism for driving the battery pick-up and placement mechanism to move up and down, the transmission mechanism comprising a plurality of gear rack transmission units respectively arranged between the mounting portion and the battery pick-up and placement mechanism, wherein the limiting mechanism comprises:

[0009] A plurality of back wheel groups, which are arranged one by one corresponding to the plurality of gear rack transmission units and fixed at the preset positions of the battery access mechanism to locate the positions of the gears and racks in each group of the gear rack transmission units;

[0010] Each of the back wheel groups includes two back wheels which are attached to the back side of the corresponding rack and the side of the rack facing the battery pick-and-place mechanism at a preset angle.

[0011] In this solution, by setting a back wheel group located on the back side of the rack and on the side facing the battery pick-up and placement mechanism to limit the gear on the tooth surface of the rack in the vertical and horizontal directions, it can be ensured that the gear can mesh on the tooth surface and will not disengage from the vertical and horizontal directions, so that the gear can maintain stable meshing with the rack, and the lifting and lowering movement can be guided and limited by the back wheel group, making the transmission more stable. Each gear rack transmission structure is tightly arranged with the rack in three directions through the gear and the back wheel group, which can also reduce the stress on the gear and make the gear less likely to be damaged. In this way, the battery pick-up and placement mechanism as a whole can make the gear attached to the corresponding rack through the back wheel groups at multiple positions, so as to achieve stable lifting and lowering of the battery pick-up and placement mechanism, improve the lifting performance, and avoid the situation where the gear and rack are disengaged; the structure is simple and the cost is low.

[0012] Preferably, the number of the back wheel groups and the number of the rack and pinion transmission units satisfy the relationship that the number of the back wheel groups is a multiple of the number of the rack and pinion transmission units.

[0013] In this solution, the back wheel is in point contact. By setting multiple sets of back wheels, the limiting mechanism can be in multi-point contact, which has a better limiting effect and higher stability.

[0014] Preferably, when the number of the back wheel groups is more than twice the number of the rack and pinion transmission units, a corresponding number of the back wheel groups are arranged on the corresponding sides of the battery picking and placing mechanism based on the average number of the back wheel groups relative to the rack and pinion transmission units, so that the gears of the corresponding rack and pinion transmission units are located between the back wheel groups at the upper and lower ends.

[0015] In this solution, back wheel assemblies are respectively provided on the upper and lower sides of the gear to better limit the gear and prevent the gear from disengaging, thereby achieving a better limiting effect.

[0016] Preferably, the plurality of back wheel assemblies arranged in the same area and the rotating shafts of the corresponding gears are fixed into an integrated structure via a fixing unit.

[0017] In this solution, the back wheel assembly is fixed with the corresponding gear and the rotating shaft as an integrated structure, which facilitates the adjustment of the meshing degree of the gear and the rack and can increase the strength of the connection position.

[0018] Preferably, the fixing unit comprises a base extending and fixedly arranged along the height direction of the battery taking and placing mechanism and a plurality of fixing plates fixed on the base in the horizontal direction, and the back wheel groups are arranged on the fixing plates in a one-to-one correspondence.

[0019] In this solution, a single back wheel assembly is fixed as a whole on a fixed plate corresponding to the fixed base to ensure a close fit between the back wheel assembly and the rack, thereby improving the meshing degree of the gear rack and the guide limit function.

[0020] Preferably, the fixing plate has a recessed portion matching the back and side surfaces of the corresponding rack, so that the back wheel assembly is in close contact with the contact surface of the rack.

[0021] In this solution, the fixing plate of the fixing base is provided with a recessed portion so that the rack can be embedded therein, making it easier to arrange the back wheel assembly on the fixing plate facing the side and back of the rack, and the fit is convenient to adjust.

[0022] Preferably, each of the back wheels is fixed to a corresponding position of the fixing plate via a mounting seat, the mounting seat has a through hole for fixed connection with the fixing plate, and the through hole is a waist-shaped adjustment hole extending toward the rack.

[0023] In this solution, the installation position of the back wheel group is adjustable. The back wheel is connected to the fixed plate through a mounting seat. By setting a waist-shaped adjustment hole with a certain extension direction, the installation position of the back wheel can be adjusted by fixing bolts at different positions of the waist-shaped adjustment hole to get closer to or away from the rack, thereby ensuring the fit between the back wheel and the back or side of the rack.

[0024] Preferably, the fixing unit further comprises a bearing seat fixed on the base adjacent to the rack, and the rotating shaft of the gear is connected to the gear via a bearing disposed in the bearing seat to drive the gear to rotate.

[0025] In this solution, a shaft driving gear is provided and the shaft is connected to the gear and the fixed base by a hole-shaft connection method, and is integrated with a limit mechanism, so as to facilitate overall adjustment of the meshing degree of the gear rack and increase the strength of the connection position.

[0026] A battery transfer device is provided, wherein the battery transfer device is arranged near a battery rack having multiple battery racks for storing battery packs, and the battery transfer device comprises a mounting portion arranged adjacent to the battery rack, a battery pick-up and placement mechanism for picking up and placing batteries relative to any battery position of the battery rack, a transmission mechanism for driving the battery pick-up and placement mechanism to rise and fall, and the limiting mechanism as described above, wherein the transmission mechanism comprises a plurality of gear rack transmission units respectively arranged between the mounting portion and the battery pick-up and placement mechanism.

[0027] In this solution, this battery transport device limits the gear on the tooth surface of the rack in the vertical and horizontal directions by setting a back wheel group located on the back of the rack and on the side facing the battery pick-up and placement mechanism, which can ensure that the gear can mesh on the tooth surface and will not disengage from the vertical and horizontal directions, so that the gear can maintain stable meshing with the rack, and the lifting and lowering movement can be guided and limited by the back wheel group, making the transmission more stable. Each gear rack transmission structure is tightly arranged with the rack in three directions through the gear and the back wheel group, which can also reduce the stress on the gear and make the gear less likely to be damaged. In this way, the battery pick-up and placement mechanism as a whole can make the gear attached to the corresponding rack through the back wheel groups at multiple positions, so as to achieve stable lifting and lowering of the battery pick-up and placement mechanism, improve the lifting performance, and avoid the situation where the gear and rack are disengaged; the structure is simple and the cost is low.

[0028] Preferably, the rack of the gear rack transmission unit includes a mounting surface, the mounting portion includes a plurality of columns, the rack is detachably connected to the corresponding columns through threaded blind holes embedded in the mounting surface, and the mounting surface is arranged opposite to the side surface abutting the back wheel.

[0029] In this solution, the rack is installed on the guide mechanism from the side so that it can contact the gear and the limit mechanism from three directions respectively, thereby achieving a clamping effect, ensuring the degree of meshing, and improving transmission stability.

[0030] The positive and progressive effect of the present invention is that the present invention discloses a limiting mechanism and a battery transporting device for improving the lifting stability of a battery transporting device. By setting a back wheel group located on the back of the rack and the side facing the battery pick-and-place mechanism to limit the gear on the tooth surface of the rack in the vertical and horizontal directions, it can be ensured that the gear can be meshed on the tooth surface and will not disengage from the vertical and horizontal directions, so that the gear can maintain stable meshing with the rack, and the lifting movement can be guided and limited by the back wheel group, so that the transmission is more stable. Each gear rack transmission structure is tightly arranged with the rack in three directions through the gear and the back wheel group, which can also reduce the stress on the gear and make the gear less likely to be damaged. In this way, the battery pick-and-place mechanism as a whole can make the gear attached to the corresponding rack through the back wheel groups at multiple positions, so as to achieve stable lifting and lowering of the battery pick-and-place mechanism, improve the lifting performance, and avoid the situation where the gear and rack are disengaged; the structure is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a battery transport device according to an embodiment of the present invention.

[0032] Figure 2 Schematic diagram of the structure of the transmission mechanism of an embodiment of the present invention.

[0033] Figure 3Schematic diagram of the structure of a rack and pinion transmission unit according to an embodiment of the present invention.

[0034] Figure 4 Schematic diagram of the structure of the limiting mechanism of an embodiment of the present invention.

[0035] Figure 5 Schematic diagram of the structure of a fixing unit according to an embodiment of the present invention.

[0036] Figure 6 Schematic diagram of the structure of the back wheel according to an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] Mounting portion 100, column 110

[0039] Battery pick-and-place mechanism 200

[0040] Transmission mechanism 300, gear rack transmission unit 310, gear 311, rack 312, rotating shaft 320, bearing 330, motor 340

[0041] Limiting mechanism 400, back wheel assembly 410, back wheel 411, mounting seat 412, waist-shaped adjustment hole 413, fixing unit 420, base 421, fixing plate 422 DETAILED DESCRIPTION

[0042] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0043] like Figure 1 As shown, this embodiment provides a battery transfer device, which is arranged in a battery swap station and is used to take and place batteries from a battery rack where batteries are placed in the battery swap station. The battery transfer device includes a mounting portion 100 as a frame, and the mounting portion 100 includes four columns 110, which jointly support the main structure of the battery transfer device. The battery transfer device also includes a battery pick-up and placement mechanism 200 for taking and placing batteries relative to any battery position of the battery rack. The battery pick-up and placement mechanism 200 is connected to the four columns 110, and is driven by a transmission mechanism 300 to move up and down in a vertical direction corresponding to the length direction of the column 110. The transmission mechanism 300 includes a plurality of gear rack transmission units 310 respectively arranged between the column 110 of the mounting portion 100 and the battery pick-up and placement mechanism 200, and the gear 311 rotates on the rack 312 to achieve movement and lifting.

[0044] like Figure 2 , 3As shown in FIG. 4 , the limiting mechanism 400 for improving the lifting stability of the battery transport equipment in this embodiment includes a plurality of back wheel groups 410, which are arranged one by one corresponding to the plurality of gear rack transmission units 310 and fixed at the preset positions of the battery pick-and-place mechanism 200 to locate the positions of the gear 311 and the rack 312 in each gear rack transmission unit 310. Each back wheel group 410 includes two back wheels 411 attached to the back side of the corresponding rack 312 at a preset angle and the side of the rack 312 facing the battery pick-and-place mechanism 200.

[0045] In this embodiment, the rack and pinion transmission unit 310 includes a rack 312 disposed on the column 110 and a gear 311 connected to the battery pick-and-place device. The rack 312 has four faces, and the gear 311 is meshed with the tooth faces of the rack 312. One side of the rack 312 is used for connection with the column 110, and the back and the other side of the rack 312 are respectively in contact with the two back wheels 411 of the back wheel group 410 of the limiting mechanism 400.

[0046] The rack 312 is installed on the guide mechanism through one side so that it can contact the gear 311 and the limiting mechanism 400 from three directions respectively, thereby achieving a clamping effect and improving transmission stability.

[0047] By setting a back wheel group 410 located on the back of the rack 312 and on the side facing the battery pick-up and placement mechanism, the gear 311 is limited in the vertical and horizontal directions on the tooth surface of the rack 312, which can ensure that the gear 311 can be meshed on the tooth surface and will not come out in the vertical and horizontal directions. The gear 311 can maintain stable meshing with the rack 312, and the lifting and lowering movement can be guided and limited by the back wheel group, making the transmission more stable. Each gear rack transmission structure is closely arranged with the rack 312 from three directions through the gear 311 and the back wheel group 410, which can also reduce the stress on the gear 311 and make the gear 311 not easily damaged. In this way, the battery pick-up and placement mechanism as a whole can make the gear attached to the corresponding rack through the back wheel groups at multiple positions, so as to achieve stable lifting and lowering of the battery pick-up and placement mechanism, improve the lifting performance, and avoid the situation where the gear rack is disengaged; the structure is simple and the cost is low.

[0048] like Figure 3 , 4 As shown, the number of the back wheel assemblies 410 and the number of the rack and pinion transmission units 310 satisfy the relationship that the number of the back wheel assemblies 410 is a multiple of the number of the rack and pinion transmission units 310 .

[0049] In this embodiment, there are four groups of gear rack transmission units 310 respectively arranged at the four corners of the battery pick-and-place mechanism 200. There are eight back wheel groups 410 divided into four groups corresponding to the gear rack transmission units 310. Two back wheel groups 410 respectively limit the same gear rack transmission unit 310. The back wheel 411 is point contact. By setting multiple groups of back wheels 411, the limiting mechanism 400 can be contacted at multiple points, with better limiting effect and higher stability.

[0050] In other embodiments, the number of the back wheel groups 410 corresponding to a group of gear rack transmission units 310 is not limited to two, and other numbers may also be set as long as multi-point contact can be ensured.

[0051] like Figure 3 , 4 As shown, when the number of back wheel groups 410 is more than twice the number of rack and pinion transmission units 310, a corresponding number of back wheel groups 410 are set on the corresponding side of the battery placement mechanism 200 based on the average number of back wheel groups 410 relative to the rack and pinion transmission units 310, so that the gear 311 of the corresponding rack and pinion transmission unit 310 is located between the back wheel groups 410 at the upper and lower ends.

[0052] In this embodiment, the back wheel group 410 corresponding to each gear rack transmission unit 310 is respectively arranged on the upper and lower sides of the contact position between the gear 311 and the rack 312, so that the gear 311 is located between the point contact position of the back wheel 411, so that the distance between the tooth surface of the rack 312 and the contact position of the gear 311 relative to the side and back of the rack 312 and the contact position of the back wheel 411 is equal, so that the force on both sides of the rack 312 is more balanced, ensuring that the gear 311 is more stably limited on the rack 312.

[0053] In other embodiments, setting the distances between the gear 311 and the two back wheels 411 to be different can also achieve a relatively stable limiting effect. However, in this solution, the torque between the two back wheels 411 is not equal, and the stability is poor.

[0054] Providing back wheel assemblies on the upper and lower sides of the gear can better limit the gear and prevent the gear from falling off, thereby achieving a better limiting effect.

[0055] like Figure 4 , 5 As shown, a plurality of back wheel assemblies 410 disposed in the same area and the rotating shafts 320 of the corresponding gears 311 are fixed into an integrated structure through a fixing unit 420 .

[0056] In this embodiment, the limiting mechanism 400 includes a fixing unit 420, which is a connecting structure arranged at the corner of the battery pick-up and placement mechanism 200, and is used to install the back wheel group 410. The fixing unit 420 is in a one-to-one correspondence with the gear rack transmission unit 310, and the back wheel group 410 corresponding to the gear rack transmission unit 310 is arranged on the fixing unit 420. The gear 311 is driven by a rotating shaft 320, and the rotating shaft 320 is connected to the motor 340 arranged on the battery pick-up and placement mechanism 200. The rotating shaft 320 is limited to the bearing 330 fixed to the battery transport mechanism, and the gear 311 is indirectly connected to the battery transport mechanism through the rotating shaft 320 and can drive the battery transport mechanism to rise and fall. The bearing 330 is also fixed on the fixing unit 420. So that the back wheel group 410 and the corresponding gear 311 and the rotating shaft 320 can be fixed as an integral structure, which is convenient for adjusting the meshing degree of the gear and the rack, and can increase the strength of the connection position.

[0057] like Figure 5 As shown, the fixing unit 420 includes a base 421 extending and fixedly arranged along the height direction of the battery pick-and-place mechanism 200 and a plurality of fixing plates fixed on the base 421 in the horizontal direction, and the back wheel groups 410 are arranged on the fixing plates one by one.

[0058] In this embodiment, the base 421 extends along the height direction of the battery pick-and-place mechanism 200, and is used to connect and fix with the battery pick-and-place mechanism 200 and the bearing 330. The fixing plates 422 are arranged at the top and bottom ends of the base 421, and the two back wheel assemblies 410 corresponding to the gear rack transmission unit 310 there are respectively fixed on the two fixing plates 422 located at the top and bottom of the base 421. The single back wheel assembly 410 is fixed as a whole on the fixing plate corresponding to the fixed base 421, ensuring the close fit between the back wheel assembly 410 and the rack 312, improving the gear rack meshing degree and the guide limit function.

[0059] like Figure 5 As shown, the fixing plate has a recessed portion that matches the back and side surfaces of the corresponding rack 312 so that the back wheel assembly 410 is in close contact with the contact surface of the rack 312 .

[0060] In this embodiment, a corner of the fixing plate 422 that contacts the column 110 of the mounting portion 100 is notched to form a recessed portion, so that the rack 312 can be embedded in this position and the back and side surfaces of the rack 312 can face the fixing plate 422. The fit is easy to adjust, which facilitates the installation of the back wheel 411.

[0061] like Figure 5 , 6As shown, each back wheel 411 is fixed to a corresponding position of the fixing plate through a mounting seat 412 . The mounting seat 412 has a through hole for fixed connection with the fixing plate. The through hole is a waist-shaped adjustment hole 413 extending toward the rack 312 .

[0062] In this embodiment, the back wheel 411 is installed in the mounting seat 412, and the mounting seat 412 is fixed to the fixing plate 422 by bolts. The mounting seat 412 has a waist-shaped adjustment hole 413 extending toward the rack 312, and the bolt passes through the waist-shaped adjustment hole 413 and is connected to the through hole on the fixing plate 422. By providing the waist-shaped adjustment hole 413 with a certain extension direction, the installation position of the back wheel 411 can be adjusted by fixing the bolt at different positions of the waist-shaped adjustment hole 413 to get closer to or farther from the rack 312, thereby ensuring the fit between the back wheel 411 and the back or side of the rack 312.

[0063] In this embodiment, the adjustment hole on the mounting seat 412 and the through hole on the mounting portion are waist-shaped holes extending toward the rack 312, and multiple adjustment holes and through holes are provided at different positions of the two to make the connection more stable and the adjustment freedom higher. In other embodiments, only the connection hole that can adjust the position can be provided on the mounting seat 412 or the fixing plate 422, and only ordinary through holes are provided on the other side, and the number of the adjustment holes and through holes can be flexibly set.

[0064] By setting the position of the back wheel 411 to be adjustable, it is possible to adapt to rack and pinion transmission units 310 of different specifications, and ensure that the back wheel 411 can fit the side and back of the rack 312 .

[0065] like Figure 3 , 4 As shown, the fixing unit 420 further includes a bearing 330 seat fixed on the base 421 adjacent to the rack 312 , and the rotating shaft 320 of the gear 311 is connected to the gear 311 through the bearing 330 disposed in the bearing 330 seat to drive the gear 311 to rotate.

[0066] In this embodiment, the bearing 330 seat is disposed on the base 421 and is connected to the bearing 330 by bolts.

[0067] By setting the rotating shaft 320 to drive the gear 311 and connecting the rotating shaft 320, the gear 311 and the fixed base 421 together by a hole-shaft connection method, and integrating it with the limiting mechanism 400, it is convenient to adjust the meshing degree of the gear rack as a whole and increase the strength of the connection position.

[0068] In this solution, the rack 312 is installed on the guide mechanism through the non-back surface, the tooth surface and the side surface, so that it can contact the gear 311 and the limiting mechanism 400 from three directions respectively, achieving a clamping effect and improving transmission stability.

[0069] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 should not be understood as a limitation on the present invention.

[0070] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A limiting mechanism for improving the lifting stability of a battery transport device, wherein the battery transport device is arranged near a battery rack having a plurality of battery packs, and the battery transport device comprises a battery pick-up and placement mechanism for picking up and placing batteries relative to any battery position of the battery rack, and a plurality of gear rack transmission units for driving the battery pick-up and placement mechanism to move up and down, characterized in that: The limiting mechanism comprises: A plurality of back wheel groups are arranged one by one corresponding to the plurality of gear rack transmission units and fixed on the corresponding side surfaces of the battery pick-and-place mechanism, so that the gears of the corresponding gear rack transmission units are located between the back wheel groups at the upper and lower ends to locate the positions of the gears and racks in each group of the gear rack transmission units.

2. The limiting mechanism for improving the lifting stability of battery transport equipment according to claim 1, characterized in that: Each of the back wheel groups comprises two back wheels which are attached to the back side of the corresponding rack and the side of the rack facing the battery taking and placing mechanism at a preset angle.

3. The limiting mechanism for improving the lifting stability of battery transport equipment according to claim 1, characterized in that: The number of the back wheel groups and the number of the rack and pinion transmission units satisfy the relationship that the number of the back wheel groups is a multiple of the number of the rack and pinion transmission units; Preferably, when the number of the back wheel groups is more than twice the number of the rack and pinion transmission units, a corresponding number of the back wheel groups are arranged on the corresponding side surfaces of the battery placement mechanism based on the average number of the back wheel groups relative to the rack and pinion transmission units.

4. The limiting mechanism for improving the lifting stability of battery transport equipment according to claim 1, characterized in that: The plurality of back wheel assemblies arranged in the same area and the rotating shafts of the corresponding gears are fixed into an integrated structure through a fixing unit.

5. The limiting mechanism for improving the lifting stability of battery transport equipment according to claim 4, characterized in that: The fixing unit comprises a base extending and fixedly arranged along the height direction of the battery taking and placing mechanism and a plurality of fixing plates fixed on the base in the horizontal direction, and the back wheel groups are arranged on the fixing plates in a one-to-one correspondence.

6. The limiting mechanism for improving the lifting stability of battery transport equipment according to claim 5, characterized in that: The fixing plate has a recessed portion matching the back and side surfaces of the corresponding rack, so that the back wheel assembly is closely attached to the contact surface of the rack.

7. The limiting mechanism for improving the lifting stability of battery transport equipment according to claim 5, characterized in that: Each of the back wheels is fixed to a corresponding position of the fixing plate through a mounting seat, and the mounting seat is provided with a through hole for fixed connection with the fixing plate, and the through hole is a waist-shaped adjustment hole extending toward the rack.

8. The limiting mechanism for improving the lifting stability of battery transport equipment according to claim 5, characterized in that: The fixing unit also includes a bearing seat fixed on the base adjacent to the rack, and the rotating shaft of the gear is connected to the gear through a bearing arranged in the bearing seat to drive the gear to rotate.

9. A battery transport device, characterized in that: The battery transfer equipment is arranged near a battery rack having multiple battery racks for storing battery packs. The battery transfer equipment includes a battery picking and placing mechanism for picking and placing batteries relative to any battery compartment of the battery rack, multiple sets of gear rack transmission units for driving the battery picking and placing mechanism to move up and down, and a limiting mechanism as described in any one of claims 1 to 8.

10. The battery transport device according to claim 9, characterized in that: The rack of the gear rack transmission unit includes a mounting surface, and the battery transporting equipment also includes a plurality of columns. The rack is detachably connected to the corresponding columns through threaded blind holes embedded in the mounting surface, and the mounting surface is arranged opposite to the side surface abutting against the back wheel.

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