A mobile battery swap station

Abstract

The application relates to a mobile battery replacement station, which comprises a tractor head, a flatbed trailer and a battery replacement box body, the battery replacement box body is provided with a ground rail frame, the ground rail frame is provided with a battery pack and a longitudinally movable gantry, the gantry is fixed with a multi-stage forklift capable of transversely stretching and retracting, the multi-stage forklift is connected with a battery lifting appliance through a lifting mechanism, the lifting mechanism comprises a supporting shaft and a speed reducer, the supporting shaft is installed on the multi-stage forklift, both ends of the supporting shaft are provided with driven chain wheels, the speed reducer is fixed on the multi-stage forklift, an input shaft of the speed reducer is connected with a servo motor, both ends of an output shaft of the speed reducer are provided with driving chain wheels, both sides of the speed reducer are provided with lifting chains, the lifting chains pass through the driving chain wheels and the driven chain wheels, the lower end of the lifting chain is hinged to the battery lifting appliance, the upper end of the lifting chain is hinged to the multi-stage forklift through an air spring, and the air spring and the speed reducer are located at both sides of the supporting shaft. The application has the advantages of compact structure, convenient movement, stability and reliability and good adaptability.

Description

Technical Field

[0001] This invention relates to a battery swapping station, specifically a mobile battery swapping station. Background Technology

[0002] In the field of electric trucks, the large number of batteries leads to long charging times. Therefore, batteries are typically fixed to mounting frames to form a replaceable battery pack, and dedicated battery swapping stations are set up to charge the pack. When the battery pack's charge is low, the vehicle can be driven to the swapping station for replacement, preventing disruption to normal use. Existing battery swapping stations are mainly skid-mounted, meaning the skid-mounted structure is fixed in a selected location. For example, patent CN217730260U discloses a single-box battery swapping station. Once constructed, this type of station cannot be moved and is subject to significant site limitations, only suitable for locations with abundant mains power. It cannot meet the needs of locations with insufficient mains power. Summary of the Invention

[0003] The purpose of this invention is to provide a mobile battery swapping station, which has the advantages of compact structure, convenient mobility, stability and reliability, good adaptability and strong practicality.

[0004] To address the aforementioned problems in the existing technology, this invention provides a mobile battery swapping station, comprising a tractor unit and a flatbed trailer connected to each other. A battery swapping box with wing doors is fixed on the flatbed trailer. A ground rail frame is provided within the battery swapping box, and n charging positions are arranged longitudinally on the ground rail frame. Battery packs are mounted on n-1 of the charging positions. A gantry frame that can move longitudinally and spans the battery packs is also provided on the ground rail frame. A multi-stage fork that can extend laterally is fixed on the gantry frame. The multi-stage fork is connected to a battery lifting device via two symmetrically distributed lifting mechanisms. The structure includes a support shaft and a reducer. The support shaft is mounted on the multi-stage forks via bearing housings. Driven sprockets are provided at both ends of the support shaft. The reducer is fixed on the multi-stage forks. A servo motor is connected to the input shaft of the reducer. Driven sprockets corresponding to the driven sprockets are provided at both ends of the output shaft of the reducer. Lifting chains are provided on both sides of the reducer. The lifting chains pass around the corresponding drive and driven sprockets. The lower end of the lifting chain is hinged to the battery lifting device. The upper end of the lifting chain is hinged to the multi-stage forks via a gas spring. The gas spring and the reducer are located on opposite sides of the support shaft.

[0005] Furthermore, in this invention, a mobile battery swapping station is provided, wherein the ground rail frame includes a bottom frame, with upward-opening balance guide grooves on both sides of the bottom frame, an upper frame fixed on the bottom frame, with outward-opening travel guide grooves on both sides of the upper frame, and guide wheel sets spaced apart installed at the bottom of the two legs of the gantry frame, each guide wheel set including a support fixed on the gantry frame, with balance guide wheels and travel guide wheels installed on the support, the balance guide wheels and travel guide wheels correspondingly located in the balance guide groove and travel guide groove, respectively.

[0006] Furthermore, in a mobile battery swapping station of the present invention, a drive assembly is provided between the two legs of the gantry and the upper frame. The drive assembly includes a bracket, a reducer, a drive motor, a drive sprocket, a guide sprocket, and a drive chain. The bracket is fixed on the gantry, the reducer is fixed on the bracket, the drive motor is fixed on the reducer, the drive sprocket is fixed on the output shaft of the reducer, and two guide sprockets are provided and symmetrically installed on the bracket below the drive sprocket. The drive chain passes around the drive sprocket and the two guide sprockets in a Z-shape, and the two ends of the drive chain are connected to the upper frame through tensioning members.

[0007] Furthermore, in a mobile battery swapping station of the present invention, the upper frame is provided with a baffle corresponding to a tensioning member. The tensioning member includes a pull rod that passes through the baffle and is connected to a drive chain. A nut is installed at the end of the pull rod away from the drive chain. A disc spring is sleeved on the pull rod between the nut and the baffle. The disc spring is in a balance sleeve with its opening facing the nut. The balance sleeve is provided with an end plate that is pressed between the disc spring and the baffle.

[0008] Furthermore, the present invention provides a mobile battery swapping station, wherein the bottom frame includes symmetrically distributed first side beams, each side beam comprising two square tubes fixed together by a connector, and the balance guide groove is formed by the gap between the two square tubes of the first side beam; the upper frame includes symmetrically distributed second side beams, the second side beams being made of channel steel, and the walking guide groove being formed by the groove of the channel steel of the second side beam; the gantry frame is made of welded square tubes with I-beams welded to the lower ends of its two legs, and the supports are fixed to the bottom of the I-beams by bolts.

[0009] Furthermore, the present invention provides a mobile battery swapping station, wherein the battery hoisting device includes a docking frame, four centrally symmetrically distributed chain hinge seats on the upper side of the docking frame, and spaced-apart lifting claw assemblies on the lower side of the docking frame. The lifting claw assembly includes a connecting plate fixed to the docking frame, a guide member fixed to the lower side of the connecting plate, and a limiting groove penetrating both ends on the upper center of the guide member. A gear shaft and two lifting claws are provided in the limiting groove. The gear shaft is installed in the middle position of the limiting groove through two flanged bearings that cooperate with the connecting plate and the guide member. The upper end of the gear shaft is connected to a reduction motor fixed to the upper side of the connecting plate. The two lifting claws slide in cooperation with the limiting groove and are located on both sides of the gear shaft. Each of the two lifting claws is fixed with a rack that meshes with the gear shaft.

[0010] Furthermore, in a mobile battery swapping station of the present invention, an upper self-lubricating plate is fixed on the connecting plate and fits against the upper side of the lifting claw, and a lower self-lubricating plate is fixed on the guide member and fits against the lower side of the lifting claw; the two side walls of the lifting claw are respectively provided with arc-shaped grooves along the length direction, and the two side walls of the limiting groove are respectively provided with through holes at intervals corresponding to the lifting claw, and springs are provided in the through holes. The outer end of the spring presses against the pressure plate fixed to the outside of the guide member, and the inner end of the spring presses against the steel ball located in the arc-shaped groove of the lifting claw.

[0011] Furthermore, in a mobile battery swapping station of the present invention, the multi-stage forks include a fixed fork, a middle fork, and an outer fork that slide in sequence. Two fixed forks, two middle forks, and two outer forks are symmetrically arranged. An intermediate support plate, two mounting plates, and two bracket plates are fixed between the two outer forks. Two gas spring hinge seats are respectively provided on the two bracket plates. The support shafts of the two lifting mechanisms are correspondingly mounted on the two mounting plates. The reducers of the two lifting mechanisms are fixed on the intermediate support plate. The gas springs of the two lifting mechanisms are respectively connected to the corresponding gas spring hinge seats through pins.

[0012] Furthermore, in a mobile battery swapping station of the present invention, two positioning posts are fixed to the lower side of the two mounting plates respectively, and the docking frame is provided with positioning holes that cooperate with the positioning posts; the driven sprocket, the driving sprocket, the drive sprocket and the guide sprocket are all three-row sprockets, and the lifting chain and the drive chain are all three-row chains.

[0013] Furthermore, in a mobile battery swapping station of the present invention, the lower side of the connecting plate is provided with an upper groove for accommodating an upper self-lubricating plate, and the bottom of the limiting groove of the guide member is provided with a lower groove for accommodating a lower self-lubricating plate; two lifting claw assemblies are provided, and the two lifting claw assemblies are respectively located at the two ends of the docking frame.

[0014] Compared with existing technologies, the mobile battery swapping station of this invention has the following advantages: This invention uses an interconnected tractor unit and a flatbed trailer. A battery swapping box with wing doors is fixed on the flatbed trailer. A ground rail frame is installed within the battery swapping box. n charging positions are arranged longitudinally on the ground rail frame. Battery packs are installed at n-1 charging positions. A gantry frame that can move longitudinally and spans the battery packs is installed on the ground rail frame. A multi-stage fork that can extend laterally is fixed on the gantry frame. The multi-stage fork is connected to a battery lifting device through two symmetrically distributed lifting mechanisms. The lifting mechanisms are supported by... The system comprises a support shaft and a reducer. The support shaft is mounted on a multi-stage fork via bearing housings, with driven sprockets at both ends. The reducer is fixed to the multi-stage fork, with a servo motor connected to its input shaft. The output shaft of the reducer has drive sprockets at both ends corresponding to the driven sprockets. Lifting chains are installed on both sides of the reducer, bypassing the corresponding drive and driven sprockets. The lower end of the lifting chain is hinged to a battery lifting device, and the upper end is hinged to the multi-stage fork via a gas spring. The gas spring and reducer are positioned on opposite sides of the support shaft. This design constitutes a compact, easily movable, stable, reliable, adaptable, and highly practical mobile battery swapping station. This invention, by setting up a tractor unit and a flatbed trailer, can quickly move the battery swapping box and its internal components, including the ground rail frame, battery pack, gantry frame, multi-stage forks, lifting mechanism, and battery hoist, to the required location, improving mobility and environmental adaptability, and meeting the needs of sites with limited mains power. By setting up a ground rail frame and gantry frame, and fixing laterally extendable multi-stage forks on the gantry frame, the battery pack can be transferred inside and outside the swapping box during battery swapping using the multi-stage forks, effectively reducing the lateral width of the swapping box and improving mobility. By setting two symmetrically distributed lifting mechanisms on the multi-stage forks, the battery hoist can be lifted and lowered as a whole when the two lifting mechanisms are controlled synchronously. When one of the lifting mechanisms is controlled independently, the battery hoist can be leveled, improving safety, reliability, and docking accuracy when loading and unloading battery packs. By equipping the lifting mechanism with a support shaft, driven sprocket, reducer, drive sprocket, lifting chain, and gas spring, the lifting chain can be routed around the corresponding drive and driven sprockets. The gas spring and reducer are positioned on opposite sides of the support shaft. On one hand, the lifting function can be achieved by utilizing the contraction capacity of the gas spring in conjunction with the drive sprocket to drive the lifting chain. On the other hand, the reciprocating winding method of the lifting chain increases the coverage angle of the drive sprocket. Compared with existing lifting mechanisms that use rope reels to wind steel wire ropes, this effectively reduces swaying and improves stability and reliability.

[0015] The following detailed description of a mobile battery swapping station according to the present invention, with reference to the accompanying drawings, illustrates the specific embodiments. Attached Figure Description

[0016] Figure 1This is an isometric view of a mobile battery swapping station according to the present invention.

[0017] Figure 2 This is an isometric view of the internal structure of the battery swapping box in this invention;

[0018] Figure 3 This is a front view of the ground track frame and gantry in this invention;

[0019] Figure 4 This is a top view of the ground rail frame and gantry in this invention;

[0020] Figure 5 This is an isometric view of the ground rail frame and gantry in this invention;

[0021] Figure 6 for Figure 3 AA direction view in the middle;

[0022] Figure 7 for Figure 4 BB view in the middle;

[0023] Figure 8 for Figure 6 A magnified view of the area at position C in the middle;

[0024] Figure 9 for Figure 7 A magnified view of the area at position D in the middle;

[0025] Figure 10 for Figure 7 A magnified view of the area at position E in the middle;

[0026] Figure 11 This is a front view of the multi-stage forks, lifting mechanism, and battery hoist in this invention;

[0027] Figure 12 This is an isometric view of the multi-stage forks, lifting mechanism, and battery hoist in this invention;

[0028] Figure 13 This is a front view of the external forks, lifting mechanism, and battery hoist in this invention;

[0029] Figure 14 This is a top view of the external forks, lifting mechanism, and battery hoist in this invention;

[0030] Figure 15 This is an isometric view of the external forks, lifting mechanism, and battery hoist in this invention;

[0031] Figure 16 for Figure 13 FF view in the middle;

[0032] Figure 17 for Figure 13 GG view in the middle;

[0033] Figure 18 for Figure 14 HH direction view in the middle;

[0034] Figure 19 This is a front view of the battery lifting device in this invention;

[0035] Figure 20 This is a top view of the battery lifting device in this invention;

[0036] Figure 21 This is an isometric view of the battery lifting device in this invention;

[0037] Figure 22 for Figure 19 II-direction view in the middle;

[0038] Figure 23 for Figure 19 The JJ view in the middle. Detailed Implementation

[0039] First, it should be noted that the directional terms such as up, down, left, right, front, and back used in this invention are merely descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this invention.

[0040] like Figures 1 to 23 The present invention illustrates a specific embodiment of a mobile battery swapping station, comprising a tractor unit 1 and a flatbed trailer 2 connected to each other. A battery swapping box 3 with wing doors is fixed to the flatbed trailer 2. A ground rail frame 4 is installed within the battery swapping box 3, and n charging positions are arranged longitudinally on the ground rail frame 4. Battery packs 5 are installed at the n-1 charging positions, leaving one charging position empty for placing a battery pack 5 removed from the vehicle 100. A gantry 6, which can move longitudinally and span the battery pack 5, is set on the ground rail frame 4. A multi-stage fork 7, which can extend laterally, is fixed on the gantry 6. The multi-stage fork 7 is connected to the battery lifting device 9 through two symmetrically distributed lifting mechanisms 8. The lifting mechanism 8 is equipped with a support shaft 81 and a reducer 82. The support shaft 81 is mounted on the multi-stage fork 7 through a bearing seat 811. Both ends of the support shaft 81 are respectively provided with driven sprockets 812. The reducer 82 is fixed on the multi-stage fork 7. The input shaft of the reducer 82 is connected to a servo motor 821. Both ends of the output shaft of the reducer 82 are respectively provided with drive sprockets 822 corresponding to the driven sprockets 812. Furthermore, lifting chains 83 are respectively provided on both sides of the reducer 82, so that the lifting chains 83 pass around the corresponding driving sprocket 822 and driven sprocket 812. The lower end of the lifting chain 83 is hinged to the battery lifting device 9, and the upper end of the lifting chain 83 is hinged to the multi-stage fork 7 through the gas spring 84. The gas spring 84 and the reducer 82 are located on both sides of the support shaft 81.

[0041] The above configuration constitutes a compact, easily movable, stable, reliable, adaptable, and highly practical mobile battery swapping station. This invention, by setting up a tractor unit 1 and a flatbed trailer 2, can quickly move the battery swapping box 3, along with its ground rail frame 4, battery pack 5, gantry frame 6, multi-stage forks 7, lifting mechanism 8, and battery hoist 9, to the required location, improving mobility and environmental adaptability, and meeting the needs of sites with limited mains power. By setting up the ground rail frame 4 and gantry frame 6, and fixing the laterally extendable multi-stage forks 7 on the gantry frame 6, the battery pack 5 can be transferred inside and outside the battery swapping box during swapping using the multi-stage forks 7, effectively reducing the lateral width of the battery swapping box 3 and improving mobility. By setting up two symmetrically distributed lifting mechanisms 8 on the multi-stage forks 7, the battery hoist 9 can be lifted as a whole when both lifting mechanisms 8 are controlled simultaneously, while controlling one lifting mechanism 8 individually... The battery lifting device 9 can be leveled, improving safety, reliability, and docking accuracy when loading and unloading the battery pack 5. The lifting mechanism 8 is equipped with a support shaft 81, driven sprocket 812, reducer 82, drive sprocket 822, lifting chain 83, and gas spring 84. The lifting chain 83 bypasses the corresponding drive sprocket 822 and driven sprocket 812, with the gas spring 84 and reducer 82 positioned on either side of the support shaft 81. This utilizes the retraction capacity of the gas spring 84 in conjunction with the drive sprocket 822 to drive the lifting chain 83, achieving the lifting function. Furthermore, the reciprocating winding of the lifting chain 83 increases the coverage angle of the drive sprocket 822. Compared to existing lifting mechanisms that use a rope reel to wind the wire rope, this effectively reduces swaying and improves stability and reliability. It should be noted that in practical applications, the invention also includes multiple hydraulic outriggers at the bottom of the flatbed trailer 2. These outriggers support and level the flatbed trailer 2 after it has been moved to its destination, ensuring stability and reliability. It should also be noted that the structure of the charging position and battery pack 5 is well known to those skilled in the art, wherein the top and bottom of the battery pack 5 are respectively provided with rectangular frames to establish a connection with the charging position and battery hanger 9.

[0042] As an optimization, this specific embodiment adopts the following structure for the ground track frame 4: a bottom frame 41 is set, and the bottom frame 41 is provided with upward-facing balance guide grooves 411 on both sides. An upper frame 42 is fixed on the bottom frame 41, and the upper frame 42 is provided with outward-facing travel guide grooves 421 on both sides. At the same time, this specific embodiment installs spaced guide wheel sets at the bottom of the two legs of the gantry frame 6, and the guide wheel sets are fixed to the supports 61 on the gantry frame 6. Balance guide wheels 62 and travel guide wheels 63 are installed on the supports 61, wherein the balance guide wheels 62 and travel guide wheels 63 are respectively located in the balance guide grooves 411 and travel guide grooves 421. This structure forms a three-dimensional guide and limit ground rail structure by setting balance guide grooves 411 and travel guide grooves 421 on the bottom frame 41 and the upper frame 42 respectively. With the balance guide wheels 62 and travel guide wheels 63 set on the gantry 6 corresponding to the balance guide grooves 411 and travel guide grooves 421, the stability and reliability of the structure and operation are improved. During the large-scale lateral extension and retraction of the multi-stage forks 7, the overturning of the gantry 6 can be effectively prevented. As an optimization, this specific embodiment also provides drive components between the two legs of the gantry frame 6 and the upper frame 42, so as to drive the gantry frame 6 to move longitudinally along the ground rail frame 4. The drive components adopt the following structure: including a bracket 64, a reducer 65, a drive motor 66, a drive sprocket 67, a guide sprocket 68, and a drive chain 69. The bracket 64 is fixed on the gantry frame 6, the reducer 65 is fixed on the bracket 64, the drive motor 66 is fixed on the reducer 65, the drive sprocket 67 is fixed on the output shaft of the reducer 65, the guide sprocket 68 has two symmetrically mounted on the bracket 64 below the drive sprocket 67, and the drive chain 69 passes around the drive sprocket 67 and the two guide sprockets 68 in a Z-shape. The two ends of the drive chain 69 are connected to the upper frame 42 through tensioning members. This invention improves the stability and reliability of the drive and the precision of the control by using a drive chain 69 in conjunction with a drive sprocket 67 and guide sprockets 68, and by having the drive chain 69 pass around the drive sprocket 67 and the two guide sprockets 68 in a Z-shape. Compared with the prior art method of directly driving the steel wheel to roll by a reducer, this invention improves the stability and reliability of the drive and the precision of the control.

[0043] In a specific embodiment, the present invention provides a baffle 422 corresponding to the tensioning member on the upper frame 42, and the tensioning member adopts the following structure: a pull rod 423 passing through the baffle 422 and connected to the drive chain 69 is provided; a nut 424 is installed at the end of the pull rod 423 away from the drive chain 69; a disc spring 425 is sleeved on the pull rod 423 between the nut 424 and the baffle 422; the disc spring 425 is placed in a balance sleeve 426 with its opening facing the nut 424; and the balance sleeve 426 has an end plate that presses against the disc spring 425 and the baffle 422. This tensioning member has the characteristics of simple structure, easy assembly and disassembly, good stability, and strong adaptability, and improves the adaptability of the drive chain 69 to the drive sprocket 67 while ensuring structural stability. In a specific embodiment, the present invention provides a bottom frame 41 with symmetrically distributed first side beams 412, and each first side beam 412 has two square tubes, which are fixed together by spaced-apart connectors. The balance guide groove 411 is formed by the gap between the two square tubes of the first side beam 412. This bottom frame 41 has the advantages of simple structure and easy fabrication. Similarly, in this specific embodiment, the upper frame 42 is provided with symmetrically distributed second side beams 427, which are made of channel steel. The travel guide groove 421 is formed by the groove of the channel steel of the second side beam 427. This upper frame 42 also has the advantages of simple structure and easy fabrication. To improve the stability of the structure and the convenience of connection, in this specific embodiment, the gantry 6 is made of welded square tubes, and I-beams 610 are welded to the lower ends of its two legs. The supports 61 are fixed to the bottom of the I-beams 610 by multiple bolts.

[0044] As an optimization, this specific embodiment adopts the following structure for the battery hoist 9: a docking frame 91 is provided, and four chain hinge seats 92 distributed in a centrally symmetrical manner are provided on the upper side of the docking frame 91 so as to be connected to the lifting chains 83 of the two lifting mechanisms 8 through pin shafts; and a claw assembly 93 distributed at intervals is provided on the lower side of the docking frame 91 so as to be connected to the rectangular frame on the top of the battery pack 5. The lifting claw assembly 93 is fixed to the connecting plate 931 on the docking frame 91. A guide member 932 is fixed to the lower side of the connecting plate 931. A limiting groove 9321 that passes through both ends is provided in the middle of the upper side of the guide member 932. A gear shaft 933 and two lifting claws 934 are arranged in the limiting groove 9321. The gear shaft 933 is installed in the middle position of the limiting groove 9321 through two flanged bearings 935 that cooperate with the connecting plate 931 and the guide member 932. The upper end of the gear shaft 933 is connected to the reduction motor 936 fixed to the upper side of the connecting plate 931. The two lifting claws 934 slide with the limiting groove 9321 and are positioned on both sides of the gear shaft 933. The two lifting claws 934 are respectively fixed with racks 937 that mesh with the gear shaft 933. The battery lifting device 9 in this configuration features a simple structure, convenient operation, and reliable connection. When lifting the battery pack 5, the battery lifting device 9 is first moved to directly above the battery pack 5 via the gantry 6 and multi-stage forks 7. Then, the battery lifting device 9 is lowered onto the rectangular frame at the top of the battery pack 5 via two lifting mechanisms 8. Next, the symmetrically distributed lifting claws 934 are extended and hooked onto the rectangular frame by the reduction motors 936 of each claw assembly 93, thus connecting the battery lifting device 9 to the battery pack 5. After the battery lifting device 9 and the battery pack 5 are moved to the target position via the gantry 6 and multi-stage forks 7, the symmetrically distributed lifting claws 934 are retracted by the reduction motors 936 of each claw assembly 93, thus disconnecting the battery lifting device 9 from the battery pack 5. This invention simplifies the structure and improves the ease of operation and connection reliability by equipping the battery lifting device 9 with spaced-apart lifting claw assemblies 93. These lifting claw assemblies 93 are composed of a connecting plate 931, a guide member 932, a gear shaft 933, a reduction motor 936, lifting claws 934, and a rack 937. By simply driving the gear shaft 933 to rotate via the reduction motor 936, the symmetrically distributed lifting claws 934 can be extended or retracted.

[0045] As an optimization, this specific embodiment improves the sensitivity of the extension or retraction of the lifting claw 934 by fixing an upper self-lubricating plate 938, which is attached to the upper side of the lifting claw 934, on the connecting plate 931, and a lower self-lubricating plate 939, which is attached to the lower side of the lifting claw 934, on the guide member 932. Simultaneously, this specific embodiment provides arc-shaped grooves 9341 along the length direction on both side walls of the lifting claw 934, and provides spaced through holes on both side walls of the limiting groove 9321 at positions corresponding to the lifting claw 934, with springs 9310 installed in the through holes. The outer end of the spring 9310 presses against a pressure plate 9311 fixed to the outside of the guide member 932 by bolts, and the inner end of the spring 9310 presses against a steel ball 9312 located in the arc-shaped groove 9341 of the lifting claw 934. This structural design enhances the sensitivity of the extension or retraction of the claw 934 by cooperating with the arc-shaped grooves 9341 on both sides of the claw 934 and multiple steel balls 9312. Combined with the upper self-lubricating plate 938 and the lower self-lubricating plate 939, an all-round lubrication structure is formed around the claw 934, which can effectively avoid jamming.

[0046] In a specific embodiment, the present invention provides a multi-stage fork 7 consisting of a fixed fork 71, a middle fork 72, and an outer fork 73 that slide in sequence. Two of each of the fixed fork 71, middle fork 72, and outer fork 73 are symmetrically arranged to improve structural stability. An intermediate support plate 731, two mounting plates 732, and two bracket plates 733 are fixed between the two outer forks 73. Two gas spring hinge seats 734 are respectively provided on the two bracket plates 733. The support shafts 81 of the two lifting mechanisms 8 are correspondingly mounted on the two mounting plates 732, the reducers 82 of the two lifting mechanisms 8 are fixed on the intermediate support plate 731, and the gas springs 84 of the two lifting mechanisms 8 are respectively connected to the corresponding gas spring hinge seats 734 via pins. It should be noted that multi-stage forks are existing technology in the art, and their structure, principle, and connection relationships between the various stages of the forks are well known to those skilled in the art and will not be described in detail here. In a specific embodiment, the present invention fixes two positioning posts 735 on the lower side of the two mounting plates 732 respectively, and provides positioning holes 911 on the docking frame 91 to cooperate with the positioning posts 735. After the battery lifting device 9 is lifted into place, each positioning post 735 is inserted into the corresponding positioning hole 911, which can effectively improve the tightness and integrity of the connection between the battery lifting device 9 and the multi-stage fork 7, and ensure stability during movement. To enhance the stability and reliability of the structure and operation, this specific embodiment uses three rows of sprockets for the driven sprocket 812, the driving sprocket 822, the drive sprocket 67, and the guide sprocket 68. Correspondingly, the lifting chain 83 and the drive chain 69 both use three rows of chains. To improve the structural compactness, this specific embodiment provides an upper groove for accommodating the upper self-lubricating plate 938 on the lower side of the connecting plate 931, and a lower groove for accommodating the lower self-lubricating plate 939 is provided at the bottom of the limiting groove 9321 of the guide member 932. In practical applications, to achieve the goal of simplifying the structure while ensuring connection reliability, the present invention typically provides two claw assemblies 93, and the two claw assemblies 93 are respectively set at the two ends of the docking frame 91.

[0047] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications made by those skilled in the art based on the technical solutions of the present invention without departing from the design concept of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A mobile battery swapping station, comprising a tractor unit (1) and a flatbed trailer (2) connected to each other, wherein a battery swapping box (3) with wing doors is fixed on the flatbed trailer (2), characterized in that, The battery swapping box (3) is provided with a ground rail frame (4), on which n charging positions are arranged longitudinally, and battery packs (5) are provided on n-1 charging positions. The ground rail frame (4) is also provided with a gantry frame (6) that can move longitudinally and span the battery packs (5). A multi-stage fork (7) that can extend laterally is fixed on the gantry frame (6). The multi-stage fork (7) is connected to a battery hoist (9) through two symmetrically distributed lifting mechanisms (8). The lifting mechanism (8) includes a support shaft (81) and a reducer (82). The support shaft (81) is mounted on the multi-stage fork (7) through a bearing seat (811). Driven sprockets (81) are provided at both ends of the support shaft (81). 2) The reducer (82) is fixed on the multi-stage fork (7). The input shaft of the reducer (82) is connected to the servo motor (821). The output shaft of the reducer (82) is provided with drive sprockets (822) corresponding to the driven sprockets (812) at both ends. The reducer (82) is provided with lifting chains (83) on both sides. The lifting chains (83) pass around the corresponding drive sprockets (822) and driven sprockets (812). The lower end of the lifting chain (83) is hinged to the battery hanger (9). The upper end of the lifting chain (83) is hinged to the multi-stage fork (7) through the gas spring (84). The gas spring (84) and the reducer (82) are located on both sides of the support shaft (81). The battery hoist (9) includes a docking frame (91). Four chain hinge seats (92) are centrally symmetrically distributed on the upper side of the docking frame (91). A claw assembly (93) is spaced apart on the lower side of the docking frame (91). The claw assembly (93) includes a connecting plate (931) fixed to the docking frame (91). A guide member (932) is fixed to the lower side of the connecting plate (931). A through-type guide member (932) is located in the middle of the upper side of the guide member (932). The limiting groove (9321) at the end is provided with a gear shaft (933) and two lifting claws (934). The gear shaft (933) is installed in the middle position of the limiting groove (9321) through two flanged bearings (935) that cooperate with the connecting plate (931) and the guide (932). The upper end of the gear shaft (933) is connected to a reduction motor (936) fixed on the upper side of the connecting plate (931). The two lifting claws (934) are connected to the limiting groove (9321). The groove (9321) is slidably fitted and is located on both sides of the gear shaft (933). Two lifting jaws (934) are respectively fixed with racks (937) that mesh with the gear shaft (933). An upper self-lubricating plate (938) is fixed on the connecting plate (931) and fits against the upper side of the lifting jaws (934). A lower self-lubricating plate (939) is fixed on the guide member (932) and fits against the lower side of the lifting jaws (934). The two side walls of the lifting jaws (934) Each of the two sides of the limiting groove (9321) is provided with an arc-shaped groove (9341) along the length direction. The corresponding positions of the two sides of the limiting groove (9321) and the lifting claw (934) are respectively provided with through holes distributed at intervals. A spring (9310) is provided in the through hole. The outer end of the spring (9310) presses against the pressure plate (9311) fixed on the outside of the guide (232). The inner end of the spring (9310) presses against the steel ball (9312) in the arc-shaped groove (9341) of the lifting claw (934).

2. A mobile battery swapping station according to claim 1, characterized in that, The ground track frame (4) includes a bottom frame (41), with an upward-opening balance guide groove (411) on each side of the bottom frame (41). An upper frame (42) is fixed on the bottom frame (41), with an outward-opening walking guide groove (421) on each side of the upper frame (42). The bottom of the two legs of the gantry (6) is equipped with spaced guide wheel sets. The guide wheel sets include a support (61) fixed on the gantry (6). A balance guide wheel (62) and a walking guide wheel (63) are installed on the support (61). The balance guide wheel (62) and the walking guide wheel (63) are respectively located in the balance guide groove (411) and the walking guide groove (421).

3. A mobile battery swapping station according to claim 2, characterized in that, The two legs of the gantry (6) are respectively provided with drive components between the upper frame (42). The drive components include a bracket (64), a reducer (65), a drive motor (66), a drive sprocket (67), a guide sprocket (68), and a drive chain (69). The bracket (64) is fixed on the gantry (6), the reducer (65) is fixed on the bracket (64), the drive motor (66) is fixed on the reducer (65), the drive sprocket (67) is fixed on the output shaft of the reducer (65), the guide sprocket (68) is provided with two and symmetrically installed on the bracket (64) below the drive sprocket (67), and the drive chain (69) passes around the drive sprocket (67) and the two guide sprockets (68) in a Z-shape. The two ends of the drive chain (69) are respectively connected to the upper frame (42) through tensioning members.

4. A mobile battery swapping station according to claim 3, characterized in that, The upper frame (42) is provided with a baffle (422) corresponding to the tensioning member. The tensioning member includes a pull rod (423) that passes through the baffle (422) and is connected to the drive chain (69). A nut (424) is installed at the end of the pull rod (423) away from the drive chain (69). A disc spring (425) is sleeved on the pull rod (423) between the nut (424) and the baffle (422). The disc spring (425) is in a balance sleeve (426) with its opening facing the nut (424). The balance sleeve (426) is provided with an end plate that is pressed between the disc spring (425) and the baffle (422).

5. A mobile battery swapping station according to claim 4, characterized in that, The bottom frame (41) includes symmetrically distributed first side beams (412), each side beam (412) comprising two square tubes, which are fixed together by connectors. The balance guide groove (411) is formed by the gap between the two square tubes of the first side beam (412). The upper frame (42) includes symmetrically distributed second side beams (427), which are made of channel steel. The walking guide groove (421) is formed by the channel steel groove of the second side beam (427). The gantry frame (6) is made of square tubes and welded with I-beams (610) at the lower ends of its two legs. The support (61) is fixed to the bottom of the I-beams (610) by bolts.

6. A mobile battery swapping station according to claim 5, characterized in that, The multi-stage fork (7) includes a fixed fork (71), a middle fork (72), and an outer fork (73) that slide together in sequence. The fixed fork (71), the middle fork (72), and the outer fork (73) are symmetrically arranged in twos. An intermediate support plate (731), two mounting plates (732), and two bracket plates (733) are fixed between the two outer forks (73). Two air spring hinge seats (734) are respectively provided on the two bracket plates (733). The support shafts (81) of the two lifting mechanisms (8) are correspondingly installed on the two mounting plates (732). The reducers (82) of the two lifting mechanisms (8) are fixed on the intermediate support plate (731). The air springs (84) of the two lifting mechanisms (8) are respectively connected to the corresponding air spring hinge seats (734) through pins.

7. A mobile battery swapping station according to claim 6, characterized in that, Two positioning posts (735) are fixed on the lower side of the two mounting plates (732), and the docking frame (91) is provided with positioning holes (911) that cooperate with the positioning posts (735); the driven sprocket (812), the driving sprocket (822), the drive sprocket (67) and the guide sprocket (68) are all three-row sprockets, and the lifting chain (83) and the drive chain (69) are all three-row chains.

8. A mobile battery swapping station according to claim 7, characterized in that, The lower side of the connecting plate (931) is provided with an upper groove for accommodating the upper self-lubricating plate (938), and the bottom of the limiting groove (9321) of the guide member (932) is provided with a lower groove for accommodating the lower self-lubricating plate (939); there are two lifting claw assemblies (93), and the two lifting claw assemblies (93) are located at the two ends of the docking frame (91).

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