A connecting interface structure of a battery box

CN224696923UActive Publication Date: 2026-08-28KUNSHAN JIANCHUANG SPORTS TECH CO LTD
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Patent Information

Application Number
CN202521704442.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-08-12
Publication Date
2026-08-28
Estimated Expiration
2035-08-12

AI Technical Summary

Technical Problem

[0003]为保障电能的正常传输,电池仓内多会设置多个半圆形缺口的支撑板,使电池底部与支撑板的半圆形缺口接触,并通过负极接口弹簧的自身弹力,推动电池正极与正极接口紧密接触,进而使电池稳固的安装在电池仓内,此方式虽安装稳固,但在更换电池时,使用者需抠住电池正极端,挤压负极弹簧,随后将电池取出,但由于负极弹簧的弹力较大,且电池正极与电池仓内壁空间较小,因此使用者很难快速、高效且轻松地将电池取出,极大降低了工作人员的更换效率

Benefits of technology

[0023] 1. This utility model features a disassembly and assembly mechanism. Specifically, during installation, the negative terminal of the battery presses the spring of the negative terminal interface to its limit, causing the positive terminal of the battery to contact the positive terminal interface. The bottom of the battery contacts the semi-circular notches of the support block, the lowering block, and the uppering block. When removing the battery, pressing the left half of the battery in the front battery compartment causes it to move downwards with the support block as a fulcrum. This moves the lowering block downwards, pushing the left end of the hinge plate downwards and the right end upwards, causing the uppering block to lift the right half of the battery until the left side of the battery contacts the inclined groove. The right end is then lifted up for easy removal. Users can quickly remove the battery by pressing the left or right side, significantly reducing the difficulty and time spent on removal.

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Abstract

The utility model discloses a connecting interface structure of battery box relates to battery box technical field. The utility model discloses a battery box, the battery box inside is provided with the baffle, the battery box inside is provided with two battery compartments, still includes: dismounting mechanism. The utility model discloses through setting up dismounting mechanism, specifically is when installing, makes the spring of battery negative pole extrusion negative pole interface to limit, makes battery positive pole and positive pole interface contact, battery bottom and the semicircular gap of support block, lower block, upper block contact, when taking out, press the left half portion of battery in positive surface battery compartment, and it takes support block as fulcrum, and lower block is driven to go down, and promotes the lower block to go down, and promotes the articulated plate left end to go down, and right end to go up, and makes the upper block to lift the right half portion of battery, and the left side contact chute of battery stops, and right end is raised to take out conveniently, and the user presses the left side or right side of battery can take out battery quickly, and the difficulty of taking out and the time of spending are reduced greatly.
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Description

Technical Field

[0001] This utility model belongs to the field of battery box technology, and in particular relates to a connection interface structure for a battery box. Background Technology

[0002] Common battery box connection interfaces include: basic physical contact interface, output interface with wires, PCB board onboard connection interface, and dedicated battery pack interface (such as lithium battery pack). The most commonly used interface is the basic physical contact interface, which is most often used for cylindrical dry cell battery boxes such as AA / AAA batteries. The connection interface of the battery box is the core hub for realizing power transmission and physical connection. Its core mission is to establish a safe, reliable, and efficient connection bridge between the battery (energy) and the electrical equipment (load).

[0003] To ensure normal power transmission, battery compartments often have multiple support plates with semi-circular notches. The bottom of the battery contacts the semi-circular notches on the support plate, and the spring force of the negative terminal pushes the positive terminal of the battery into close contact with the positive terminal, thus securing the battery in the battery compartment. Although this method provides a secure installation, when replacing the battery, the user needs to hold the positive terminal of the battery, squeeze the negative terminal spring, and then remove the battery. However, due to the large spring force of the negative terminal spring and the small space between the positive terminal of the battery and the inner wall of the battery compartment, it is difficult for the user to remove the battery quickly, efficiently, and easily, greatly reducing the replacement efficiency of the staff. Utility Model Content

[0004] The purpose of this utility model is to provide a connection interface structure for a battery box. By setting up a disassembly and assembly mechanism, specifically during installation, the negative terminal of the battery is pressed to the limit by the spring of the negative terminal interface, so that the positive terminal of the battery contacts the positive terminal interface. The bottom of the battery contacts the semi-circular notches of the support block, the lowering block, and the uppering block. When removing the battery, pressing the left half of the battery in the front battery compartment causes it to move down with the support block as the fulcrum, which in turn moves the lowering block down, pushing the left end of the hinge plate down and the right end up, so that the uppering block lifts the right half of the battery until the left side of the battery contacts the inclined groove and stops. The right end is raised for easy removal. Users can quickly remove the battery by pressing the left or right side of the battery, which greatly reduces the difficulty and time spent on removal. This solves the problem that existing battery boxes often use a spring in the negative terminal interface to push the positive terminal of the battery to make close contact with the positive terminal interface of the battery box in order to ensure close contact between the positive and negative terminals of the battery and the positive and negative terminals of the battery box. However, due to the large elasticity of the negative terminal spring and the small space between the positive terminal of the battery and the inner wall of the battery compartment, it is difficult for users to remove the battery quickly, efficiently, and easily.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a connection interface structure for a battery box, including a battery box with a partition inside. The battery box has two battery compartments inside, and a positive terminal interface and a negative terminal interface are respectively installed on the left and right sides of the inner walls of the battery compartments. It also includes:

[0007] A disassembly and assembly mechanism, located inside the battery compartment, is used for quick battery removal. The mechanism includes two support blocks, and a lowering block and an uppering block are disposed inside the battery compartment.

[0008] A fixing mechanism is disposed inside the partition and is used to fix the installed battery.

[0009] The positive and negative terminals inside the two battery compartments are arranged in opposite directions. The positive terminal is W-shaped. The top of the support block, the lower moving block, and the upper moving block are all provided with semi-circular notches. The semi-circular notches on the top of the support block, the lower moving block, and the upper moving block are adapted to the outer surface of the battery.

[0010] Furthermore, the support block is fixedly connected to the inner wall of the battery compartment, the inner wall of the battery compartment is provided with a short groove and a long groove, the lower moving block is slidably limited to the short groove, the upper moving block is slidably limited to the long groove, the side of the lower moving block near the short groove is T-shaped, and the side of the upper moving block near the long groove is T-shaped.

[0011] Both the short groove and the long groove are T-shaped, and the length of the short groove is shorter than the length of the long groove.

[0012] Furthermore, the fixing mechanism includes a seagull plate, and a second movable groove is provided inside the partition. The seagull plate and the second movable groove are slidably limited to each other. A storage groove is provided on the left side of the inner wall of the two battery compartments, and the seagull plate is inserted into the storage groove.

[0013] The seagull board has a T-shaped center, the second movable slot has a T-shaped design, the second movable slot is connected to the storage slot, and the width of the storage slot is shorter than the width of the seagull board.

[0014] Furthermore, the bottom of the battery compartment has two movable slots, and the lower moving block and the upper moving block are respectively slidably limited to the two movable slots. The battery box has a cavity inside.

[0015] The two movable slots are respectively connected to the short slot and the long slot, and the movable slot, the short slot and the long slot are all connected to the cavity inside the battery box.

[0016] Furthermore, a hinge seat is fixedly connected to the top of the internal cavity of the battery box, and a hinge plate is hinged to the bottom of the hinge seat. Spring 1 is fixedly connected to the left and right sides of the top of the hinge plate. The tops of the two spring 1 are fixedly connected to the top of the internal cavity of the battery box, and inclined grooves are opened at the bottom of the two battery compartments.

[0017] The top of the hinge plate abuts against the bottom of the lower and upper moving blocks, the two springs are symmetrically arranged, and the two inclined slots are arranged in opposite directions.

[0018] Furthermore, the partition has vertical grooves inside and slots at the top;

[0019] The slot is connected to the vertical groove, and the vertical groove is connected to the second movable groove.

[0020] Furthermore, a T-shaped block is inserted into the slot, and a locking block is fixedly connected to the bottom of the T-shaped block. The locking block is slidably limited to the vertical groove. A locking groove is opened at the top of the seagull board. A second spring is fixedly connected to the top of the locking block. The top of the second spring is fixedly connected to the top of the inner wall of the vertical groove.

[0021] The T-shaped block is T-shaped, and the locking block is adapted to the locking groove.

[0022] This utility model has the following beneficial effects:

[0023] 1. This utility model features a disassembly and assembly mechanism. Specifically, during installation, the negative terminal of the battery presses the spring of the negative terminal interface to its limit, causing the positive terminal of the battery to contact the positive terminal interface. The bottom of the battery contacts the semi-circular notches of the support block, the lowering block, and the uppering block. When removing the battery, pressing the left half of the battery in the front battery compartment causes it to move downwards with the support block as a fulcrum. This moves the lowering block downwards, pushing the left end of the hinge plate downwards and the right end upwards, causing the uppering block to lift the right half of the battery until the left side of the battery contacts the inclined groove. The right end is then lifted up for easy removal. Users can quickly remove the battery by pressing the left or right side, significantly reducing the difficulty and time spent on removal.

[0024] 2. This utility model features a fixing mechanism. Specifically, the seagull plate is pulled out and moved to the right to the extreme position of the second moving slot. Its right side squeezes and pushes the locking block upward. After the vertical slot aligns with the locking slot, the locking block enters the locking slot under the action of the second spring. The seagull plate, support block, lowering block, and uppering block work together to secure the battery in the battery compartment. When replacing the battery, the T-shaped block is moved upward to make the locking block leave the locking slot, and the seagull plate is moved to the left to the storage slot. This design can securely install the battery in the battery compartment and ensure stable power transmission.

[0025] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the internal structure of the battery box of this utility model;

[0029] Figure 3 This is a schematic diagram of the positive electrode interface structure of this utility model;

[0030] Figure 4 This is a schematic diagram of the overall structure of the disassembly and assembly mechanism of this utility model;

[0031] Figure 5 This is a schematic diagram of the spring structure of this utility model;

[0032] Figure 6 This is a schematic diagram of the overall structure of the fixing mechanism of this utility model;

[0033] Figure 7 This utility model Figure 6 A magnified structural diagram of A in the middle;

[0034] Figure 8 This is a schematic diagram of the locking groove structure of this utility model.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. Battery box; 11. Divider; 12. Battery compartment; 13. Positive terminal; 14. Negative terminal; 2. Disassembly / assembly mechanism; 21. Support block; 22. Lowering block; 221. Short slot; 222. Moving slot one; 23. Upper moving block; 231. Long slot; 24. Hinge seat; 25. Hinge plate; 251. Spring one; 26. Slanted slot; 3. Fixing mechanism; 31. Seagull plate; 311. Moving slot two; 312. Storage slot; 313. Locking slot; 32. Vertical slot; 321. Slot; 33. T-shaped block; 331. Locking block; 332. Spring two. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0038] Please see Figures 1-8 As shown, this utility model is a connection interface structure for a battery box, including a battery box 1, a partition 11 inside the battery box 1, two battery compartments 12 inside the battery box 1, a positive terminal interface 13 and a negative terminal interface 14 respectively installed on the left and right sides of the inner wall of the battery compartment 12, and further including:

[0039] Disassembly and assembly mechanism 2 is located inside the battery compartment 12. The disassembly and assembly mechanism 2 is used for quick battery removal. The disassembly and assembly mechanism 2 includes two support blocks 21, and a downward moving block 22 and an upward moving block 23 are provided inside the battery compartment 12.

[0040] The fixing mechanism 3 is located inside the partition 11 and is used to fix the installed battery. The positive terminal interface 13 and negative terminal interface 14 inside the two battery compartments 12 are arranged in opposite directions. The positive terminal interface 13 is W-shaped. The top of the support block 21, the lower moving block 22 and the upper moving block 23 are all provided with semi-circular notches. The semi-circular notches on the top of the support block 21, the lower moving block 22 and the upper moving block 23 are adapted to the outer surface of the battery.

[0041] The support block 21 is fixedly connected to the inner wall of the battery compartment 12. The inner wall of the battery compartment 12 is provided with a short groove 221 and a long groove 231. The lower moving block 22 is slidably limited to the short groove 221, and the upper moving block 23 is slidably limited to the long groove 231. The side of the lower moving block 22 near the short groove 221 is T-shaped, and the side of the upper moving block 23 near the long groove 231 is T-shaped. Both the short groove 221 and the long groove 231 are T-shaped, and the length of the short groove 221 is shorter than the length of the long groove 231.

[0042] The fixing mechanism 3 includes a seagull plate 31. A second movable groove 311 is provided inside the partition 11. The seagull plate 31 and the second movable groove 311 are slidably limited together. A storage groove 312 is provided on the left side of the inner wall of the two battery compartments 12. The seagull plate 31 is inserted into the storage groove 312. The center of the seagull plate 31 is T-shaped. The second movable groove 311 is T-shaped. The second movable groove 311 and the storage groove 312 are interconnected. The width of the storage groove 312 is shorter than the width of the seagull plate 31.

[0043] The bottom of the battery compartment 12 has two movable slots 222. The lower moving block 22 and the upper moving block 23 are respectively slidably limited to the two movable slots 222. The battery box 1 has a cavity inside. The two movable slots 222 are respectively connected to the short slot 221 and the long slot 231. The movable slots 222, the short slot 221 and the long slot 231 are all connected to the cavity inside the battery box 1.

[0044] A hinge seat 24 is fixedly connected to the top of the internal cavity of the battery box 1. A hinge plate 25 is hinged to the bottom of the hinge seat 24. Springs 251 are fixedly connected to the left and right sides of the top of the hinge plate 25. The tops of the two springs 251 are fixedly connected to the top of the internal cavity of the battery box 1. Sloping grooves 26 are opened at the bottom of the two battery compartments 12. During installation, the negative terminal of the battery is pressed to the limit of the spring of the negative terminal interface 14, so that the positive terminal of the battery contacts the positive terminal interface 13. The bottom of the battery contacts the semi-circular notches of the support block 21, the lower moving block 22, and the upper moving block 23. When removing, press The left half of the battery in the front battery compartment 12 is supported by the support block 21. The left end moves down, which drives the lowering block 22 to move down, pushing the left end of the hinge plate 25 down and the right end up. This causes the upper moving block 23 to lift the right half of the battery until the left side of the battery contacts the inclined groove 26 and stops. The right end is raised for easy removal. Users can quickly remove the battery by pressing the left or right side, which greatly reduces the difficulty and time spent on removal. The top of the hinge plate 25 abuts against the bottom of the lower moving block 22 and the upper moving block 23. The two springs 251 are symmetrically arranged, and the two inclined grooves 26 are arranged oppositely.

[0045] The partition 11 has a vertical groove 32 inside and a slot 321 on the top of the partition 11; wherein the slot 321 is connected to the vertical groove 32, and the vertical groove 32 is connected to the movable slot 311.

[0046] A T-shaped block 33 is inserted into the slot 321. A locking block 331 is fixedly connected to the bottom of the T-shaped block 33. The locking block 331 slides and limits the movement of the vertical groove 32. A locking groove 313 is opened at the top of the seagull plate 31. A spring 332 is fixedly connected to the top of the locking block 331. The top of the spring 332 is fixedly connected to the top of the inner wall of the vertical groove 32. When the seagull plate 31 is pulled out and moved to the right to the limit position of the moving groove 311, its right side squeezes and pushes the locking block 331 upward. After the vertical groove 32 and the locking groove 313 are aligned, Locking block 331 enters locking groove 313 under the action of spring 332. Seagull plate 31, support block 21, lowering block 22, and uppering block 23 work together to secure the battery in battery compartment 12. When replacing, the T-shaped block 33 moves up to make locking block 331 leave locking groove 313, and seagull plate 31 moves left to storage groove 312. This setting can securely install the battery in battery compartment 12 and ensure stable power transmission. The T-shaped block 33 is T-shaped, and locking block 331 is adapted to locking groove 313.

[0047] A specific application of this embodiment is as follows: When in use, the user places two batteries into the two battery compartments 12 according to the positive and negative markings on the left and right sides of the battery compartment 12. When placing the battery into the front battery compartment 12, first place the negative terminal of the battery towards the negative terminal interface 14 on the left and the positive terminal towards the positive terminal interface 13 on the right. Then tilt the battery into the battery compartment 12 so that the negative terminal of the battery presses against the negative terminal interface 14. When the spring of the negative terminal interface 14 is pressed to its limit, the battery can be smoothly placed in, so that its positive terminal is in close contact with the positive terminal interface 13 on the right. At this time, the middle part of the battery is in contact with the semi-circular notch at the top of the support block 21, while the left and right parts of the battery are in contact with the semi-circular notches at the top of the lower moving block 22 and the upper moving block 23, respectively. At this time, the spring of the negative terminal interface 14 pushes the positive terminal of the battery to make close contact with the positive terminal interface 13 through its own elastic force, so that the battery is stably installed in the front battery compartment 12. The battery in the back battery compartment 12 is installed in the same way.

[0048] After all installation is complete, grasp the portion of the gull-shaped plate 31 that remains outside the storage slot 312 and pull the gull-shaped plate 31 out of the storage slot 312. Then, move the gull-shaped plate 31 to the right. As the gull-shaped plate 31 continues to move to the right within the second moving slot 311 and eventually reaches its limit position, the right side of the gull-shaped plate 31 will contact the inclined surface at the bottom of the locking block 331 and press the locking block 331, causing it to move upward. At this time, the second spring 332 is compressed. When the vertical slot 32 is completely aligned with the locking slot 313, the locking block 331 loses its locking function. When the gull plate 31 is pressed, the spring 332 pushes the locking block 331 down into the locking groove 313 through its own elastic force, and the T-shaped block 33 enters the slot 321. At this time, the gull plate 31 is fixed. The gull plate 31, with its shape similar to a gull wing, and in cooperation with several support blocks 21, lowering blocks 22 and uppering blocks 23, can securely install the battery in the battery compartment 12, ensuring that the positive and negative terminals of the battery are in close contact with the positive terminal interface 13 and the negative terminal interface 14 at all times, and ensuring stable power transmission.

[0049] When the battery needs to be replaced, move the T-shaped block 33 upwards, and the locking block 331 will move accordingly. When the locking block 331 leaves the locking groove 313, the unsecured gull plate 31 can be moved to the left into the storage groove 312. Since the width of the storage groove 312 is shorter than the width of the gull plate 31, a small part of the gull plate 31 will remain outside the storage groove 312, making it easier to pull out the gull plate 31 next time. Then press the left half of the battery in the front battery compartment 12. At this time, the battery moves down on the left side with the support block 21 as the fulcrum, which drives the left lowering block 22 to move down as well. At this time, the lowering block 22 will push the left end of the hinge plate 25 down and the right end up, so the right uppering block 23 will move up and push the right half of the battery upwards. When the left side of the battery contacts the inclined groove 26, stop moving. At this time, the right end of the battery has been lifted up, making it easier to take it out. The battery in the rear battery compartment 12 is taken out in the same way.

[0050] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A connection interface structure for a battery box, comprising a battery box (1), wherein a partition (11) is provided inside the battery box (1), and two battery compartments (12) are opened inside the battery box (1), wherein a positive terminal interface (13) and a negative terminal interface (14) are respectively installed on the left and right sides of the inner wall of the battery compartments (12), characterized in that, Also includes: A disassembly and assembly mechanism (2) is installed inside the battery compartment (12). The disassembly and assembly mechanism (2) is used to quickly remove the battery. The disassembly and assembly mechanism (2) includes two support blocks (21). A downward moving block (22) and an upward moving block (23) are provided inside the battery compartment (12). Fixing mechanism (3), the fixing mechanism (3) is disposed inside the partition (11), the fixing mechanism (3) is used to fix the installed battery; Among them, the positive terminal interface (13) and negative terminal interface (14) inside the two battery compartments (12) are arranged in opposite directions. The positive terminal interface (13) is arranged in a W shape. The top of the support block (21), the lower moving block (22) and the upper moving block (23) are all provided with a semi-circular notch. The semi-circular notch at the top of the support block (21), the lower moving block (22) and the upper moving block (23) is adapted to the outer surface of the battery.

2. The connection interface structure of a battery box according to claim 1, characterized in that, The support block (21) is fixedly connected to the inner wall of the battery compartment (12). The inner wall of the battery compartment (12) is provided with a short groove (221) and a long groove (231). The lower moving block (22) is slidably limited to the short groove (221). The upper moving block (23) is slidably limited to the long groove (231). The side of the lower moving block (22) near the short groove (221) is T-shaped. The side of the upper moving block (23) near the long groove (231) is T-shaped. The short groove (221) and the long groove (231) are both T-shaped, and the length of the short groove (221) is shorter than the length of the long groove (231).

3. The connection interface structure of a battery box according to claim 1, characterized in that, The fixing mechanism (3) includes a seagull plate (31), and a second movable groove (311) is provided inside the partition (11). The seagull plate (31) and the second movable groove (311) are slidably limited to each other. A storage groove (312) is provided on the left side of the inner wall of the two battery compartments (12). The seagull plate (31) is inserted into the storage groove (312). The center of the seagull board (31) is T-shaped, the second moving slot (311) is T-shaped, the second moving slot (311) is connected to the storage slot (312), and the width of the storage slot (312) is shorter than the width of the seagull board (31).

4. The connection interface structure of a battery box according to claim 2, characterized in that, The bottom of the battery compartment (12) has two movable slots (222), and the lower moving block (22) and the upper moving block (23) are respectively slidably limited to the two movable slots (222). The battery box (1) has a cavity inside. Among them, the two movable slots (222) are respectively connected to the short slot (221) and the long slot (231), and the movable slot (222), the short slot (221) and the long slot (231) are all connected to the cavity inside the battery box (1).

5. The connection interface structure of a battery box according to claim 4, characterized in that, A hinge seat (24) is fixedly connected to the top of the internal cavity of the battery box (1). A hinge plate (25) is hinged to the bottom of the hinge seat (24). Springs (251) are fixedly connected to the left and right sides of the top of the hinge plate (25). The tops of the two springs (251) are fixedly connected to the top of the internal cavity of the battery box (1). Sloping grooves (26) are opened at the bottom of the two battery compartments (12). The top of the hinge plate (25) abuts against the bottom of the lower moving block (22) and the upper moving block (23), the two springs (251) are symmetrically arranged, and the two inclined grooves (26) are arranged oppositely.

6. The connection interface structure of a battery box according to claim 3, characterized in that, The partition (11) has a vertical groove (32) inside and a slot (321) on the top of the partition (11). The slot (321) is connected to the vertical slot (32), and the vertical slot (32) is connected to the movable slot (311).

7. The connection interface structure of a battery box according to claim 6, characterized in that, A T-shaped block (33) is inserted inside the slot (321). A locking block (331) is fixedly connected to the bottom of the T-shaped block (33). The locking block (331) is slidably limited to the vertical groove (32). A locking groove (313) is opened at the top of the seagull board (31). A spring (332) is fixedly connected to the top of the locking block (331). The top of the spring (332) is fixedly connected to the top of the inner wall of the vertical groove (32). The T-shaped block (33) is T-shaped, and the locking block (331) is adapted to the locking groove (313).