Flat battery bearing platform

By designing a flat battery carrier platform and adopting side-drive and horizontal locking/unlocking components, the flexibility and safety issues of battery swapping equipment in vehicles with low chassis have been solved. This has enabled a reduction in the height of the battery carrier platform and precise position adjustment, thereby improving battery swapping efficiency and safety.

CN223890964UActive Publication Date: 2026-02-10TIMES QIJI NEW ENERGY TECHNOLOGY (SHENZHEN) CO LTD
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Patent Information

Application Number
CN202520449891.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-14
Publication Date
2026-02-10
Estimated Expiration
2035-03-14

AI Technical Summary

Technical Problem

Existing battery swapping methods have poor flexibility and portability for vehicles with low chassis. Traditional sunken and lifting battery swapping methods have problems such as high construction costs, complex operation, significant safety hazards, and low efficiency. In addition, the excessive height of the battery support plate increases the difficulty of loading and unloading and safety risks.

Method used

A flat battery carrying platform is designed, which adopts a support plate, a rotating component, and an unlocking component. The support plate is rotated by side drive, and the unlocking component is horizontally set to reduce the overall height of the battery carrying platform. The precise position adjustment of the battery pack is achieved through a slewing mechanism and a slewing support mechanism.

Benefits of technology

It achieves space saving on the battery carrying platform, reduces the overall height, adapts to the battery swapping needs of various vehicles, improves operational safety and efficiency, and reduces the physical exertion and safety risks of battery loading and unloading.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a flat type battery bearing platform which is used for loading a battery pack, the flat type battery bearing platform comprises a supporting plate, a rotating assembly and a plurality of locking and unlocking assemblies, the supporting plate is used for loading the battery pack, the rotating assembly is arranged on the side edge of the supporting plate, and the rotating assembly is used for driving the supporting plate to rotate. The locking and unlocking assembly is used for locking and unlocking the battery pack and comprises a gun body and a second driving mechanism for driving the gun body to operate, the second driving mechanism is horizontally arranged on the side, away from the battery pack, of the supporting plate, and the gun body penetrates through the supporting plate from the second driving mechanism; the rotating assembly is arranged on the side edge of the supporting plate, the supporting plate is driven to rotate from the side edge, and the second driving mechanism of the locking and unlocking assembly is horizontally arranged, so that the vertical space of the battery bearing platform is saved, the overall height of the battery bearing platform is reduced, and the battery replacement requirements of various vehicles are met; and the battery bearing platform can be rotated, so that the position of the battery pack can be accurately adjusted.
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Description

Technical Field

[0001] This utility model relates to the field of battery swapping vehicle technology, specifically to a flat battery carrying platform. Background Technology

[0002] With the rapid development of the new energy vehicle industry, battery packs, as core components, have seen their charging and battery swapping technologies become one of the key factors restricting the widespread adoption of new energy vehicles. For vehicles with low chassis, traditional battery swapping methods mainly employ either a sunken or lifted design.

[0003] However, sunken battery swapping requires excavating a pit to accommodate the swapping equipment, which significantly increases construction costs and faces problems such as large land area requirements, complex procedures, and numerous environmental restrictions, severely limiting the flexibility and portability of the swapping equipment. While lift-type battery swapping avoids pit construction, its equipment costs are high, operation is time-consuming, and it requires extremely high track precision, further increasing implementation difficulty. Furthermore, lift-type battery swapping may pose operational safety hazards, leading to low swapping efficiency. Given these numerous problems with battery swapping methods, reducing the height of the swapping trolley is one solution. The battery support plate is a promising area for improvement. An excessively high support plate not only increases the difficulty and time of battery loading and unloading, but also requires operators to have greater range of motion, increasing physical exertion and workload; batteries are more prone to falling during loading and unloading, increasing safety risks; a higher center of gravity makes the vehicle more prone to swaying and tilting during driving and battery loading / unloading, affecting stability; and it also wastes space. Therefore, reducing the height of the battery support plate of the swapping trolley has become an urgent need. Summary of the Invention

[0004] The purpose of this invention is to provide a flat battery support platform to solve the above-mentioned problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A flat battery carrier platform is provided for loading a battery pack. The flat battery carrier platform includes a support plate, a rotating assembly, and several locking / unlocking assemblies. The support plate is used to load the battery pack. The rotating assembly is disposed on the side of the support plate and is used to drive the support plate to rotate. The locking / unlocking assemblies are used to lock / unlock the battery pack. The locking / unlocking assemblies include a gun body and a second drive mechanism for driving the gun body to rotate. The second drive mechanism is horizontally disposed on the side of the support plate away from the battery pack. The gun body passes through the support plate from the second drive mechanism.

[0007] As a further improvement of this utility model, a support beam is provided below the support plate, and a rotation mechanism is provided between the support plate and the support beam. The rotation mechanism is located at the center of the support plate, and the support plate can rotate relative to the support beam with the rotation mechanism as the center.

[0008] As a further improvement of the present invention, the rotary mechanism includes a bearing housing, a bearing, a rotary shaft and a top end cover. The bearing housing is mounted on a support beam, the bearing is mounted inside the bearing housing, the rotary shaft is rotatably mounted inside the bearing, and the support plate is connected to the rotary shaft through the top end cover.

[0009] As a further improvement of the present invention, a plurality of rotary support mechanisms are provided below the support plate. The rotary support mechanism includes a rotary seat and a rotatable rolling element mounted on the rotary seat. The rotary seat is mounted on the support beam, and the rolling element abuts against the support plate and can roll on the support plate.

[0010] As a further improvement of the present invention, the rotating assembly includes a first driving mechanism, a spur gear and an arc-shaped rack, the spur gear and the arc-shaped rack meshing with each other, the first driving mechanism being mounted on a support beam, the first driving mechanism being able to drive the spur gear to rotate, one side of the arc-shaped rack having protruding teeth, and the other side of the arc-shaped rack being connected to a support plate.

[0011] As a further improvement of the present invention, the support beam includes a slewing reinforcing plate, a connecting rod, and a mounting plate. The slewing reinforcing plate is disposed at the center of the connecting rod, and there are two mounting plates, which are respectively disposed at both ends of the connecting rod. The first driving mechanism is disposed on the mounting plate.

[0012] As a further improvement of this utility model, a plurality of rotating blocks are provided on the support plate, which are used to cooperate with the support beam to limit the rotation range of the support plate.

[0013] As a further improvement of the present invention, the gun body includes an unlocking rotating head seat, an unlocking gun head, and a strip-shaped stop pin. The unlocking gun head is sleeved with the unlocking rotating head seat. The second driving mechanism can drive the unlocking rotating head seat to move. A strip-shaped hole is provided on the unlocking rotating head seat in the radial direction. A through hole is provided on the unlocking gun head in the radial direction. The strip-shaped stop pin passes through both the strip-shaped hole and the through hole.

[0014] As a further improvement of this utility model, cotter pins are provided at both ends of the strip-shaped stop pin, and the cotter pins are used to connect the unlocking gun head and the strip-shaped stop pin.

[0015] As a further improvement of the present invention, a first slot is provided on the unlocking gun head. The first slot extends from the bottom of the unlocking gun head to the top in the axial direction. The unlocking rotating head seat can be inserted into the first slot. A spring is provided in the first slot. One end of the spring is connected to the bottom of the first slot, and the other end of the spring is connected to the top of the unlocking rotating head seat.

[0016] The beneficial effects of this utility model are as follows:

[0017] By setting the rotating component on the side of the support plate and driving the support plate to rotate from the side, and by setting the second drive mechanism of the unlocking component horizontally, the vertical space of the battery carrier platform is saved, the overall height of the battery carrier platform is reduced, and it can adapt to the battery swapping needs of various vehicles; and the battery carrier platform can be rotated to precisely adjust the position of the battery pack. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a flat battery support platform;

[0019] Figure 2 yes Figure 2 Enlarged view of point A in the middle;

[0020] Figure 3 This is a schematic diagram of the internal structure of a flat battery support platform;

[0021] Figure 4 This is a schematic diagram of the bottom of the support plate;

[0022] Figure 5 This is a cross-sectional view of the support plate;

[0023] Figure 6 This is an exploded view of the rotary mechanism;

[0024] Figure 7 This is a structural diagram of the unlocking / unlocking components and the locking mechanism;

[0025] Figure 8 This is a structural diagram of the gun body;

[0026] Figure 9 It is a cross-sectional view of the gun barrel.

[0027] in:

[0028] 1-Support plate, 11-Rotating stop, 2-Support beam, 21-Rotation reinforcing plate, 22-Connecting rod, 23-Mounting plate, 24-Soft stop, 31-First drive mechanism, 32-Spur gear, 33-Arc rack, 4-Unlocking assembly, 41-Second drive mechanism, 42-Unlocking head seat, 421-Strip hole, 43-Unlocking gun head, 431-First slot, 432-Second slot, 44-Strip 45-Cotter pin, 46-Spring, 47-Sealing ring, 48-Dust baffle, 5-Rotating mechanism, 51-Bearing housing, 52-Bearing, 53-Rotating shaft, 531-Simultaneous section, 532-Isolation section, 533-Rotating section, 54-Top end cover, 55-Bottom end cover, 56-Rotating seat, 57-Rolling element, 58-Rotating pad, 6-Bottom guard plate, 7-Positioning pin, 8-Locking mechanism. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present invention.

[0030] If the description of this utility model involves directions (e.g., up, down, left, right, front, back, outside, inside, etc.), then the directions involved need to be defined. For example, "To clearly express the position and direction described in this utility model, the operator of the instrument is used as a reference, the end closer to the operator is the proximal end, and the end farther from the operator is the distal end." Or, the paper can be used as a reference. Of course, if the positional relationship between the two is defined by mutual reference in the subsequent description, then this definition is not required.

[0031] A flat battery support platform, such as Figure 1 As shown, this device is used in a battery swapping unit to carry a battery pack. The battery carrying platform includes a support plate 1, a rotating assembly, and several locking / unlocking assemblies 4. The support plate 1 is used to load the battery pack. The rotating assembly is located on the side of the support plate 1 and is used to drive the support plate 1 to rotate parallel to the support plate 1. The locking / unlocking assemblies 4 are used to lock / unlock the battery pack. The locking / unlocking assemblies 4 include a gun body and a second drive mechanism 41 that drives the gun body to rotate. The second drive mechanism 41 is horizontally arranged on the side of the support plate 1 away from the battery pack. The gun body passes through the support plate 1 from the second drive mechanism 41.

[0032] As one embodiment of this utility model, such as Figures 3-4As shown, a support beam 2 is provided below the support plate 1, and a rotating mechanism 5 is provided between the support plate 1 and the support beam 2. The rotating mechanism 5 is located at the center of the support plate 1, and the support plate 1 can rotate relative to the support beam 2 with the rotating mechanism 5 as the center.

[0033] like Figures 4-6 As shown, the fixed component of the rotary mechanism 5 is fixed to the support beam 2, and the rotating component of the rotary mechanism 5 is connected to the support plate 1. Therefore, the support plate 1 can rotate relative to the support beam 2 around the rotating component of the rotary mechanism 5. In one embodiment of this utility model, the rotary mechanism 5 includes a bearing seat 51, a bearing 52, and a rotary shaft 53. The bearing seat 51 is fixed to the support beam 2, the bearing 52 is disposed within the bearing seat 51, and the rotary shaft 53 is rotatably disposed within the bearing 52. The rotary shaft 53, bearing 52, and bearing seat 51 are coaxially arranged. A top end cap 54 is provided at the top of the rotary shaft 53, and the rotary shaft 53 is connected to the support plate 1 via the top end cap 54 and fasteners. A bottom end cap 55 is provided at the bottom of the rotary shaft 53, and the bearing seat 51 and support beam 2 are fixed via the bottom end cap 55 and fasteners. Simultaneously, the bottom end cap 55 also restricts the axial position between the rotary shaft 53 and the bearing 52.

[0034] Furthermore, the support plate 1 and the support beam 2 are separately disposed. The rotating shaft 53 includes a synchronously moving section 531, a blocking section 532, and a rotating section 533 connected in sequence. The synchronously moving section 531 is used to drive the support plate 1 to rotate synchronously. Preferably, a central hole is provided on the support plate 1. The shape of the central hole is consistent with the cross-section of the synchronously moving section 531, and the shape of the central hole is not circular. Preferably, the central hole is a square hole, and the cross-section of the synchronously moving section 531 is square, consistent with the shape of the central hole. The blocking section 532 is used to separate the support plate 1 and the support beam 2, so that the support plate 1 and the support beam 2 are separated. Preferably, the diameter or axial width of the blocking section 532 is greater than that of the synchronously moving section 531 and the rotating section 533, and the blocking section 532 has a certain axial thickness. The cross-section of the rotating section 533 is circular.

[0035] Several rotary support mechanisms are provided below the support plate 1. Each rotary support mechanism includes a rotary seat 56 and a rolling element 57 rotatably mounted on the rotary seat 56. The rotary seat 56 can be mounted on the support beam 2. The rolling element 57 abuts against the support plate 1 and can roll on the support plate 1. When the support plate 1 and the support beam 2 rotate relative to each other, the rolling element 57 provides support force to the support plate 1 and reduces the frictional force of the movement. As an embodiment of this utility model, the rolling element 57 is a roller. Further, a rotary pad 58 is provided on the support plate 1, and the rolling element 57 can slide on the rotary pad 58. The rotary pad 58 can be a soft plate, thereby reducing the noise generated when the rolling element 57 rolls.

[0036] As one embodiment of the present invention, the support beam 2 includes a slewing reinforcing plate 21, a connecting rod 22 and a mounting plate 23. The slewing reinforcing plate 21 is disposed at the center of the connecting rod 22. There are two mounting plates 23, which are respectively disposed at both ends of the connecting rod 22. The mounting plates 23 are used to connect other equipment.

[0037] In one embodiment of this utility model, the rotating assembly is used to drive the support plate 1 to rotate, and the rotation is a rotation about the rotary mechanism 5. The rotating assembly includes a first driving mechanism 31 and a gear and rack mechanism driven by the first driving mechanism 31. The gear and rack mechanism includes a spur gear 32 and an arc-shaped rack 33 meshing with each other. The first driving mechanism 31 is disposed on the support beam 2, specifically, the first driving mechanism 31 is disposed on the mounting plate 23. The first driving mechanism 31 can drive the spur gear 32 to rotate. The first driving mechanism 31 can be a motor. The arc-shaped rack 33 is connected to the side of the support plate 1. The outer convex side of the arc-shaped rack 33 is provided with teeth. The toothless side of the arc-shaped rack 33 is connected to the support plate 1. When the spur gear 32 is driven to rotate by the first driving mechanism 31, the spur gear 32 meshes with the arc-shaped rack 33, thereby driving the arc-shaped rack 33 to rotate, and thus realizing the rotation of the support plate 1. The rotating component is located on the side of the support plate 1, rather than below it, thus saving space and reducing the overall height of the battery support platform.

[0038] In one embodiment of this utility model, the curvature of the rotary pad 58 is consistent with the curvature of the arc-shaped rack 33.

[0039] In one embodiment of this utility model, a plurality of rotating blocks 11 are provided on the support plate 1, with the rotating blocks 11 extending from the support plate 1 toward the support beam 2. The rotating blocks 11 are used to cooperate with the support beam 2 to limit the rotation range of the support plate 1. During rotation, the support beam 2 can block the rotating blocks 11, thereby limiting the rotation range of the support plate 1. Furthermore, a plurality of soft blocks 24 are provided on the support beam 2. The soft blocks 24 can cooperate with the rotating blocks 11 to reduce the collision impact between the rotating blocks 11 and the support beam 2 and absorb noise.

[0040] As an embodiment of this utility model, a plurality of locking / unlocking components 4 are provided on the support plate 1. The locking / unlocking components 4 are used to lock / unlock the battery pack. The locking / unlocking components 4 include a gun body and a second drive mechanism 41. The second drive mechanism 41 can drive the gun body to rotate. The second drive mechanism 41 is horizontally arranged on the side of the support plate 1 away from the battery pack. The gun body passes through the support plate 1 from the second drive mechanism 41. The horizontal arrangement means that the drive source in the second drive mechanism 41, such as a motor, has its output shaft parallel to the plane of the support plate 1. A transmission mechanism is provided between the output shaft of the motor and the gun body. The original rotation of the motor output shaft parallel to the plane of the support plate 1 is changed to a rotation perpendicular to the plane of the support plate 1 through the transmission mechanism, thereby reducing the overall height of the battery support platform.

[0041] As one embodiment of this utility model, such as Figures 7-9 As shown, the gun body includes an unlocking rotating head base 42, an unlocking gun head 43, and a strip-shaped stop pin 44. The unlocking gun head 43 is sleeved with the unlocking rotating head base 42. The second driving mechanism 41 can drive the unlocking rotating head base 42 to move. The unlocking rotating head base 42 is provided with a strip-shaped hole 421, which penetrates the unlocking rotating head base 42 in the radial direction. The unlocking gun head 43 is also provided with a through hole, which penetrates the unlocking gun head 43 in the radial direction. The strip-shaped stop pin 44 penetrates both the strip-shaped hole 421 and the through hole, thereby connecting the unlocking rotating head base 42 and the unlocking gun head 43.

[0042] In one embodiment of this utility model, cotter pins 45 are respectively provided at both ends of the strip-shaped stop pin 44. The cotter pins 45 are used to connect the unlocking gun head 43 and the strip-shaped stop pin 44. The unlocking rotating head base 42 and the unlocking gun head 43 are connected by the strip-shaped stop pin 44. When the second driving mechanism 41 drives the unlocking rotating head base 42 to rotate, the unlocking gun head 43 can rotate synchronously with the unlocking rotating head base 42.

[0043] In one embodiment of this utility model, a first slot 431 and a second slot 432 are provided on the unlocking gun head 43. The first slot 431 extends axially from the bottom of the unlocking gun head 43 to the top, and the second slot 432 extends axially from the top of the unlocking gun head 43 to the bottom. The first slot 431 and the second slot 432 are not connected. Preferably, the first slot 431 and the second slot 432 are coaxially arranged. The unlocking rotary head seat 42 can be inserted into the first slot 431. A spring 46 is provided in the first slot 431. One end of the spring 46 is connected to the bottom of the first slot 431, and the other end of the spring 46 is connected to the top of the unlocking rotary head seat 42, thereby flexibly transmitting the power of the unlocking rotary head seat 42 to the unlocking gun head 43. Furthermore, a spring 46 mounting hole is provided at the top of the unlocking rotary head seat 42, and the spring 46 is disposed in the spring 46 mounting hole. The second slot 432 is used to connect the external locking mechanism 8, which works with the unlocking / unlocking assembly 4 to unlock / unlock the battery pack.

[0044] Furthermore, a sealing ring 47 is provided between the housing of the unlocking rotary head seat 42 and the second drive mechanism 41, and an annular dust baffle 48 is provided on the unlocking gun head 43. The sealing ring 47 and the dust baffle 48 work together to provide dust prevention and sealing.

[0045] As an embodiment of the present invention, a bottom guard plate 6 is provided at the bottom of the support beam 2, and the bottom guard plate 6 is used to protect the components inside the battery bearing platform.

[0046] A first sensor is provided on the mounting plate 23. The first sensor is used to detect the position of the support plate 1 rotation to prevent the support plate 1 from rotating beyond the range.

[0047] A second sensor is provided on the support plate 1, which is used to detect the position of the battery pack.

[0048] A positioning pin 7 is provided on the support plate 1, which is used to position the battery pack when loading the battery pack.

[0049] The flat battery carrier platform provided by this utility model saves vertical space and reduces the overall height of the battery carrier platform by setting the rotating component on the side of the support plate 1 and driving the support plate 1 to rotate from the side. In addition, the second drive mechanism 41 of the unlocking component 4 is set horizontally, which can adapt to the battery swapping needs of various vehicles. Furthermore, the battery carrier platform can be rotated to precisely adjust the position of the battery pack.

[0050] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0051] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent implementation methods or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A flat battery carrying platform for loading battery packs, characterized in that: The flat battery carrying platform includes a support plate (1), a rotating assembly, and several locking / unlocking assemblies (4). The support plate (1) is used to load the battery pack. The rotating assembly is located on the side of the support plate (1) and is used to drive the support plate (1) to rotate. The locking / unlocking assemblies (4) are used to lock / unlock the battery pack. The locking / unlocking assemblies (4) include a gun body and a second drive mechanism (41) for driving the gun body to rotate. The second drive mechanism (41) is horizontally located on the side of the support plate (1) away from the battery pack. The gun body passes through the support plate (1) from the second drive mechanism (41).

2. The flat battery support platform according to claim 1, characterized in that: A support beam (2) is provided below the support plate (1), and a rotating mechanism (5) is provided between the support plate (1) and the support beam (2). The rotating mechanism (5) is located at the center of the support plate (1), and the support plate (1) can rotate relative to the support beam (2) with the rotating mechanism (5) as the center.

3. The flat battery support platform according to claim 2, characterized in that: The rotary mechanism (5) includes a bearing housing (51), a bearing (52), a rotary shaft (53), and a top end cover (54). The bearing housing (51) is mounted on the support beam (2), the bearing (52) is mounted inside the bearing housing (51), and the rotary shaft (53) is rotatably mounted inside the bearing (52). The support plate (1) is connected to the rotary shaft (53) through the top end cover (54).

4. The flat battery support platform according to claim 2, characterized in that: Several rotary support mechanisms are provided below the support plate (1). The rotary support mechanism includes a rotary seat (56) and a rotatable rolling element (57) mounted on the rotary seat (56). The rotary seat (56) is mounted on the support beam (2). The rolling element (57) abuts against the support plate (1) and can roll on the support plate (1).

5. The flat battery support platform according to claim 2, characterized in that: The rotating assembly includes a first driving mechanism (31), a spur gear (32), and an arc rack (33). The spur gear (32) and the arc rack (33) mesh with each other. The first driving mechanism (31) is mounted on the support beam (2). The first driving mechanism (31) can drive the spur gear (32) to rotate. One side of the arc rack (33) is provided with protruding teeth, and the other side of the arc rack (33) is connected to the support plate (1).

6. The flat battery support platform according to claim 5, characterized in that: The support beam (2) includes a slewing reinforcing plate (21), a connecting rod (22) and a mounting plate (23). The slewing reinforcing plate (21) is located at the center of the connecting rod (22). There are two mounting plates (23) and they are respectively located at both ends of the connecting rod (22). The first drive mechanism (31) is located on the mounting plate (23).

7. The flat battery support platform according to claim 2, characterized in that: A plurality of rotating blocks (11) are provided on the support plate (1), and the rotating blocks (11) are used to cooperate with the support beam (2) to limit the rotation range of the support plate (1).

8. The flat battery support platform according to claim 1, characterized in that: The gun body includes an unlocking rotating head seat (42), an unlocking gun head (43), and a strip-shaped stop pin (44). The unlocking gun head (43) is sleeved with the unlocking rotating head seat (42). The second driving mechanism (41) can drive the unlocking rotating head seat (42) to move. A strip-shaped hole (421) is provided on the unlocking rotating head seat (42) in the radial direction. A through hole is provided on the unlocking gun head (43) in the radial direction. The strip-shaped stop pin (44) passes through both the strip-shaped hole (421) and the through hole.

9. The flat battery support platform according to claim 8, characterized in that: Cotter pins (45) are provided at both ends of the bar-shaped stop pin (44), and the cotter pins (45) are used to connect the unlocking gun head (43) and the bar-shaped stop pin (44).

10. The flat battery support platform according to claim 8, characterized in that: A first slot (431) is provided on the unlocking gun head (43). The first slot (431) extends from the bottom of the unlocking gun head (43) to the top in an axial direction. The unlocking rotating head seat (42) can be inserted into the first slot (431). A spring (46) is provided in the first slot (431). One end of the spring (46) is connected to the bottom of the first slot (431), and the other end of the spring (46) is connected to the top of the unlocking rotating head seat (42).