Buckling mechanism, plug assembly and charging device

Abstract

The present invention discloses a snap-fit ​​mechanism, a plug assembly and a charging device, comprising: a housing; a first snap-fit ​​member, the first snap-fit ​​member is rotatably connected to the housing, and a first hook is arranged at one end of the first snap-fit ​​member; a first elastic element, the first elastic element can make the first snap-fit ​​member rotate relative to the housing in a first direction; a limit member, the limit member is slidably connected to the housing, when the limit member slides to the first position, the limit member abuts against the first snap-fit ​​member, thereby preventing the first snap-fit ​​member from rotating relative to the housing in a second direction, the second direction being opposite to the first direction, when the limit member slides to the second position, the limit member disengages from the abutment with the first snap-fit ​​member, thereby allowing the first snap-fit ​​member to rotate relative to the housing in the second direction. The present invention can prevent the hook from automatically retracting.

Description

Technical Field

[0001] The present invention relates to the field of charging, and in particular to a buckling mechanism, a plug assembly and a charging device. Background Art

[0002] At present, some remote controllers also use rechargeable batteries. When charging the remote controller, it is necessary to connect the plug assembly. In order to prevent the plug assembly from detaching from the remote controller during charging, a hook is provided on the plug assembly, and the hook clamps the remote controller, thereby temporarily fixing the plug assembly to the remote controller. However, the hook may automatically retract, and at this time, the hook cannot clamp the remote controller, and the plug assembly may accidentally detach from the remote controller, and the charging process is terminated. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a snap-fit ​​mechanism that can prevent the hook from automatically retracting.

[0004] The invention also provides a plug assembly.

[0005] The invention also provides a charging device.

[0006] In a first aspect, an embodiment of the present invention provides a snap-fit ​​mechanism, comprising: a shell; a first snap-fitting member, the first snap-fitting member being rotatably connected to the shell, and a first hook being provided at one end of the first snap-fitting member; a first elastic element, the first elastic element enabling the first snap-fitting member to rotate relative to the shell along a first direction; a limiting member, the limiting member being slidably connected to the shell, when the limiting member slides to a first position, the limiting member abuts against the first snap-fitting member, thereby preventing the first snap-fitting member from rotating relative to the shell along a second direction, the second direction being opposite to the first direction, when the limiting member slides to a second position, the limiting member disengages from the abutment with the first snap-fitting member, thereby allowing the first snap-fitting member to rotate relative to the shell along the second direction.

[0007] The snap-fitting mechanism of the embodiment of the present invention has at least the following beneficial effects: a first hook is provided at one end of the first snap-fitting piece, and under the action of the first elastic element, the first hook rotates relative to the shell in a first direction, thereby realizing the basic function of clamping the target object (such as a remote control); the limiting piece is slidably connected to the shell, and when the limiting piece slides to abut against the first snap-fitting piece, the first snap-fitting piece cannot rotate relative to the shell in a second direction, and the second direction is opposite to the first direction, that is, the first hook cannot be separated from the target object, and the first hook will continue to clamp the target object; when the limiting piece slides to a position where it is separated from the abutment with the first snap-fitting piece, the first snap-fitting piece can be rotated relative to the shell in the second direction. At this time, through the action of external force, the first snap-fitting piece is rotated relative to the shell in the second direction, and the first hook can be separated from the target object, ensuring that the target object can be normally separated.

[0008] According to the snap-fit ​​mechanism of some other embodiments of the present invention, a first card slot and a second card slot are provided on the shell, and a first card point is provided on the limit member. When the limit member slides to the first position, the first card point is inserted into the first card slot, and when the limit member slides to the second position, the first card point is inserted into the second card slot.

[0009] According to the snap-fit ​​mechanism of other embodiments of the present invention, a first protrusion is provided on the limit member, a first avoidance hole is provided on the shell, the first protrusion passes through the first avoidance hole and extends outside the shell, and the first protrusion can slide along the first avoidance hole.

[0010] According to the snap-fitting mechanism of other embodiments of the present invention, a second protrusion is provided on the first snap-fitting member, a second avoidance hole is provided on the shell, the second protrusion passes through the second avoidance hole and extends outside the shell, and when the second protrusion passes through the second avoidance hole and moves toward the inside of the shell, the first snap-fitting member rotates in a second direction relative to the shell.

[0011] According to some other embodiments of the buckling mechanism of the present invention, the first buckling member can rotate relative to the housing around a first axis, and the second protrusion and the first hook are respectively located on two sides of the first axis.

[0012] According to the buckling mechanism of some other embodiments of the present invention, the first elastic element is a first spring sheet, one end of the first spring sheet is fixed to the housing, and the other end of the first spring sheet abuts against the first buckling member.

[0013] According to some other embodiments of the present invention, the snapping mechanism further includes: a second snapping piece, which is rotatably connected to the shell, and a second hook is provided at one end of the second snapping piece, and the first hook and the second hook are facing or away from each other; a second elastic element, which can make the second snapping piece rotate relative to the shell along the second direction, and the limiting piece abuts against the second snapping piece to prevent the second snapping piece from rotating relative to the shell along the first direction, or the limiting piece is disengaged from the abutment with the second snapping piece to allow the second snapping piece to rotate relative to the shell along the first direction.

[0014] In a second aspect, an embodiment of the present invention provides a plug assembly, comprising the above-mentioned snap-fit ​​mechanism, and also comprising a plug and a circuit board, wherein the plug and the circuit board are both fixed on the shell, and the plug is provided with pins, which are electrically connected to the circuit on the circuit board.

[0015] The plug assembly of the embodiment of the present invention has at least the following beneficial effects: by using the snap-fit ​​mechanism, the plug assembly will not accidentally detach from the remote control, thereby ensuring a continuous and stable connection between the plug assembly and the target object.

[0016] According to some other embodiments of the plug assembly of the present invention, the circuit board is fixed to the housing by snapping, or the circuit board is locked and fixed to the housing.

[0017] In a third aspect, an embodiment of the present invention provides a charging device, comprising the above-mentioned plug assembly.

[0018] The charging device of the embodiment of the present invention has at least the following beneficial effects: by using the plug assembly, the charging device can be stably connected to the target object, thereby continuously charging the target object, and the charging process is not easily terminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an axonometric view of the plug assembly of the first embodiment;

[0020] Figure 2 yes Figure 1 Exploded view of the plug assembly;

[0021] Figure 3 yes Figure 1 A front view of the plug assembly;

[0022] Figure 4 yes Figure 3 Sectional view along section AA;

[0023] Figure 5 yes Figure 1 A right side view of the first housing;

[0024] Figure 6 yes Figure 1 A right side view of the first fastening member;

[0025] Figure 7 yes Figure 1 Rear view of the middle stopper;

[0026] Figure 8 yes Figure 1 Axonometric view of the center stop. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0028] In the description of the embodiments of the present invention, if orientation descriptions are involved, the orientations or positional relationships indicated by “up”, “down”, “front”, “back”, “left”, “right”, etc. are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the embodiments of the present invention, if a feature is referred to as being "set", "fixed", "connected", or "installed" on another feature, it may be directly set, fixed, or connected to the other feature, or it may be indirectly set, fixed, connected, or installed on the other feature. In the description of the embodiments of the present invention, if "several" is involved, it means more than one, if "multiple" is involved, it means more than two, if "greater than", "less than", or "exceeds" is involved, it should be understood as not including the number itself, and if "above", "below", or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] Reference Figure 1 and Figure 2 , Figure 1 is an axonometric view of the plug assembly of the first embodiment, Figure 2 yes Figure 1 Exploded view of the plug assembly in the embodiment. The plug assembly of this embodiment includes a snap-fit ​​mechanism, a plug 200 and a circuit board 600, wherein the snap-fit ​​mechanism includes a housing 100, a stopper 300, a first snap-fit ​​member 400, a first elastic element, a second elastic element and a second snap-fit ​​member 700. The plug 200 and the circuit board 600 are both fixed to the housing 100, and the plug 200 is provided with a pin, which is electrically connected to the circuit on the circuit board 600.

[0031] Reference Figure 2 and Figure 5 , Figure 5 yes Figure 1The right side view of the first shell 110 in the figure. The shell 100 includes the first shell 110, the positioning frame 120 and the second shell 130. In order to realize the assembly and fixation of the shell 100, a first column 111 and a second column 117 are arranged inside the first shell 110. The first column 111 and the second column 117 are arranged in parallel. A first through hole is opened along the axis of the first column 111, and a second through hole is opened along the axis of the second column 117. The positioning frame 120 is provided with a third through hole 121 and a fourth through hole 122. The third through hole 121 and the first through hole are arranged coaxially, and the fourth through hole 122 and the second through hole are arranged coaxially. The second shell 130 is provided with a first threaded hole and a second threaded hole. The first threaded hole is arranged coaxially with the first through hole, and the second threaded hole is arranged coaxially with the second through hole.

[0032] Thus, the first screw passes through the first through hole and the third through hole 121 in sequence and is screwed into the first threaded hole, and the second screw passes through the second through hole and the fourth through hole 122 in sequence and is screwed into the second threaded hole. Thus, the first shell 110 and the second shell 130 are locked and fixed together, and the positioning frame 120 is supported by the right end face of the first column 111 and the inner side face of the second shell 130, and is supported by the right end face of the second column 117 and the inner side face of the second shell 130, so that the positioning frame 120 is installed and fixed.

[0033] After the first housing 110 and the second housing 130 are locked and fixed together, an accommodating cavity is formed inside, and the positioning frame 120 is placed in the accommodating cavity.

[0034] In order to realize the installation and fixation of the plug 200, a mounting plate 210 is provided at the lower end of the plug 200. The mounting plate 210 is in the shape of a rectangular parallelepiped. A mounting groove 142 is provided on the first housing 110. The mounting groove 142 is a rectangular parallelepiped empty groove. After the mounting plate 210 is inserted into the mounting groove 142, the first housing 110 and the second housing 130 are locked and fixed, so that the mounting plate 210 is restricted and fixed in the mounting groove 142.

[0035] In order to expose the plug 200 from the housing 100 and facilitate the docking of the plug 200 with the target object, a fifth through hole 141 is further opened at the upper end of the first housing 110. When the mounting plate 210 of the plug 200 is embedded in the mounting groove 142, the upper end of the plug 200 also extends from the fifth through hole 141 to the outside of the housing 100.

[0036] In order to realize the installation and fixation of the circuit board 600, a third hook 123 is provided on the positioning frame 120, and a pair of the third hooks 123 are provided, and the pair of third hooks 123 are arranged away from each other, and the circuit board 600 is provided with two clamping holes 610 at corresponding positions. Before locking the first shell 110 and the second shell 130, the circuit board 600 is first brought close to the positioning frame 120, and the two third hooks 123 pass through the corresponding clamping holes 610, so that the circuit board 600 is clamped on the positioning frame 120, and then the positioning frame 120 is fixed by the first shell 110 and the second shell 130. In this way, the circuit board 600 and the housing 100 are clamped and fixed.

[0037] In another embodiment, the circuit board 600 may be locked and fixed on the positioning frame 120 by screws, so as to achieve the installation and fixation of the circuit board 600.

[0038] The plug assembly can be temporarily fixed to the target object by providing a snap-fit ​​mechanism to prevent the plug 200 from being separated from the target object. The specific structure and function of the snap-fit ​​mechanism are described in detail below.

[0039] Reference Figures 2 to 6 , Figure 3 yes Figure 1 Front view of the plug assembly, Figure 4 yes Figure 3 The cross-sectional view along section AA in the figure is as follows: Figure 6 yes Figure 1 The right side view of the first fastening member 400 in the figure. The function of the fastening mechanism is explained by taking the limiting member 300, the first fastening member 400 and the first elastic element as an example. The first fastening member 400 is rotatably connected to the first shell 110. The upper end of the first fastening member 400 is provided with a first hook 410. After the first hook 410 passes through the shell 100, it extends out of the shell 100. The first hook 410 and the plug 200 are both located on the upper side of the shell 100. The first elastic element can make the first fastening member 400 rotate relative to the shell 100 along the first direction, referring to Figure 4 , viewed vertically inward from the paper surface, the first direction is counterclockwise, that is, under the action of the first elastic element, the first hook 410 can rotate in a direction close to the plug 200.

[0040] In order to realize the rotational connection between the first fastening member 400 and the first housing 110, a sixth through hole 420 is provided on the first fastening member 400 (see Figure 6 ), the first column 111 is inserted into the sixth through hole 420, and the first column 111 and the sixth through hole 420 are in clearance fit. Thus, the first fastening member 400 can rotate relative to the first housing 110.

[0041] In another embodiment, a through hole may be provided on the first housing 110 , and a rotating shaft may be provided on the first buckling component 400 , and the rotating shaft may pass through the through hole, so as to realize the rotational connection between the first buckling component 400 and the first housing 110 .

[0042] In this embodiment, the first elastic element is a first elastic sheet 500, which is formed by bending an elastic steel sheet. The first elastic sheet 500 includes an upper section 510, a middle section 520 and a lower section 530. In order to achieve the installation and fixation of the first elastic sheet 500, a U-shaped groove 116 is provided in the first housing 110 (refer to Figure 5 ), and the lower section 530 of the first elastic sheet 500 is also bent into a U-shape, and the lower section 530 is embedded in the U-shaped groove 116, so that the first elastic sheet 500 is fixed on the first housing 110.

[0043] The upper section 510 of the first spring sheet 500 is tilted, the end of the upper section 510 is against the first buckling member 400, and the first spring sheet 500 is located on the front side of the first buckling member 400. The first spring sheet 500 and the first hook 410 are respectively located on both sides of the axis of the first column 111 (the axis of the first column 111 is the first axis).

[0044] Therefore, after the first spring sheet 500 is installed on the first housing 110, the upper section 510 of the first spring sheet 500 bends forward and undergoes elastic deformation, and the first spring sheet 500 applies a backward force to the lower end of the first fastening member 400. That is, when the plug assembly is in the initial state, the first hook 410 is close to the plug 200, so that after the plug 200 is connected to the target object, the first hook 410 automatically fastens the target object.

[0045] In order to prevent the first spring piece 500 from being separated from the U-shaped groove 116 after being subjected to excessive external force, the middle section 520 of the first spring piece 500 is set as a straight plate arranged in the up-down direction, and the middle section 520 of the first spring piece 500 abuts against the first housing 110, and the first housing 110 applies a backward force to the middle section 520 of the first spring piece 500. Figure 4 , viewed vertically inwardly from the paper surface), after the upper section 510 is bent and deformed by force, the middle section 520 can provide additional torque, and the lower section 530 only needs to provide a portion of the torque to maintain the balance of the first elastic piece 500, and the lower section 530 is not easy to separate from the U-shaped groove 116.

[0046] In another embodiment, the first elastic element may also be a compression spring. In this case, the compression spring is disposed between the first hook 410 and the axis of the first column 111. One end of the compression spring abuts against the inner wall of the first housing 110, and the other end of the compression spring abuts against the first buckle 400. When the plug assembly is in the initial state, the compression spring is in a compressed state, thereby applying a force to the first buckle 400 to rotate in the counterclockwise direction (refer to Figure 4 , viewed vertically inwardly from the paper surface), the first hook 410 is in a state close to the plug 200.

[0047] In order to keep the first hook 410 away from the target object, thereby allowing the plug 200 to be separated from the target object, the first fastening member 400 is further provided with a second protrusion 440 (see Figure 4 or Figure 6 ), and the side wall of the first housing 110 is provided with a second avoidance hole 118 at a position corresponding to the second protrusion 440 (refer to Figure 2 ), the second protrusion 440 passes through the second avoidance hole 118 and extends to the outside of the first housing 110. Thus, outside the first housing 110, by pressing the second protrusion 440, the first buckling member 400 can be rotated along the second direction (refer to Figure 4 , viewed vertically inward from the paper surface, the second direction is the clockwise direction), the first hook 410 moves away from the target object, the first hook 410 no longer catches the target object, and the plug 200 can be detached from the target object.

[0048] Reference Figures 2 to 8 , Figure 7 yes Figure 1 The rear view of the middle stopper 300, Figure 8 yes Figure 1 Axonometric view of the middle limiter 300. In order to prevent the first hook 410 from being affected by external force, or the plug assembly from being hit by external force, the first hook 410 is away from the target object, and the first hook 410 no longer clamps the target object, a limiter 300 is provided. The limiter 300 is located in the accommodating cavity of the housing 100, and the limiter 300 can slide relative to the housing 100 in the up and down direction. The limiter 300 is provided with a first stopper 320 (refer to Figure 4 or Figure 8 ), a first support block 430 is provided on the first fastening member 400 (refer to Figure 4 or Figure 6 ).

[0049] When the limiting member 300 slides upward relative to the housing 100 to the first position, the first stopper 320 is located in front of the first supporting block 430. At this time, the second protrusion 440 is pressed, and the first supporting block 430 will abut against the first stopper 320, and the first buckling member 400 cannot smoothly rotate along the second direction (refer to Figure 4, viewed vertically inward from the paper, the second direction is clockwise), the first hook 410 cannot move away from the plug 200. If the first hook 410 has caught the target object, the first hook 410 will remain in a clamped state with the target object. When the limit member 300 slides downward relative to the housing 100 to the second position, the first stopper 320 moves to the lower side of the first support block 430. At this time, the second protrusion 440 is pressed, and the first buckle member 400 will rotate in the second direction (refer to Figure 4 , viewed vertically inward from the paper surface, the second direction is the clockwise direction), the first hook 410 no longer clamps the target object, thereby allowing the plug 200 to be disengaged from the target object.

[0050] In this embodiment, the limiting member 300 is further provided with a second stopper 330, and the first buckling member 400 is further provided with a second support block 450 (see Figure 4 or Figure 6 ), when the first stopper 320 abuts against the first support block 430, the second stopper 330 also abuts against the second support block 450, and when the first stopper 320 is disengaged from the first support block 430, the second stopper 330 also disengages from the second support block 450. Thus, the limiting member 300 can perform multiple limiting operations on the first buckling member 400.

[0051] In another embodiment, the first stopper 320 and the first support block 430, and the second stopper 330 and the second support block 450, can be used selectively. In this case, the limiting member 300 can also prevent the first hook 410 from accidentally detaching from the target object.

[0052] In order to realize the sliding connection between the stopper 300 and the housing 100, a sliding portion 340 is provided on the stopper 300 (see Figure 8 ), the sliding part 340 includes a first plate 341, a second plate 342 and a third plate 343, the front end of the second plate 342 is connected to the third plate 343, the rear end of the second plate 342 is connected to the first plate 341, and the first plate 341 and the third plate 343 are arranged in parallel. After the limiting member 300 is installed on the housing 100, the rear side surface of the first plate 341, the left side surface of the second plate 342 and the front side surface of the third plate 343 are all against the inner surface of the first housing 110, and the right end surface of the first plate 341 and the right end surface of the third plate 343 are both against the left side surface of the positioning frame 120, that is, after the limiting member 300 is limited by the first housing 110 and the positioning frame 120, it can only move in the up and down directions.

[0053] In another embodiment, an axis arranged along the up and down direction may also be provided on the sliding portion 340, and a semicircular groove may be provided on the first shell 110 and the positioning frame 120 respectively. After the shell 100 is assembled, the axis is limited in the two semicircular grooves. At this time, the sliding connection between the limiting member 300 and the shell 100 may also be realized.

[0054] In order to make the limiting member 300 stay in the first position, the first stopper 320 and the first support block 430 are kept in abutment with each other, thereby effectively preventing the first hook 410 from being separated from the target object in a long term; in addition, in order to make the limiting member 300 stay in the second position, the first buckling member 400 can rotate along the second direction (refer to Figure 4 , viewed vertically inward from the paper, the second direction is clockwise), the first hook 410 can be freely separated from the target object, and a first clamping point 310 is provided on the rear side of the lower end of the first plate 341 (refer to Figure 8 ), a first card slot 113 and a second card slot 115 are provided on the first housing 110 , and a T-shaped block 114 is provided between the first card slot 113 and the second card slot 115 .

[0055] When the limit member 300 slides upward toward the first position, the first clamping point 310 slides upward along the surface of the T-shaped block 114. When the first clamping point 310 slides into the first clamping groove 113, the limit member 300 is located at the first position. At this time, in the absence of external force acting on the limit member 300, the first clamping point 310 will be stuck in the first clamping groove 113, the limit member 300 cannot move relative to the first shell 110, and the first stop block 320 will continue to limit the movement of the first support block 430. When the stopper 300 slides downward toward the second position, the first clamping point 310 slides downward along the surface of the T-shaped block 114. When the first clamping point 310 slides into the second clamping groove 115, the stopper 300 is located at the second position. At this time, in the absence of external force acting on the stopper 300, the first clamping point 310 will be clamped in the second clamping groove 115, and the stopper 300 cannot move relative to the first housing 110. The first stopper 320 no longer restricts the movement of the first support block 430, and the first buckle 400 can rotate along the second direction (refer to Figure 4 , observing inward perpendicular to the paper surface, the second direction is clockwise).

[0056] In order to facilitate the movement of the limiting member 300, a first protrusion 344 is further provided on the limiting member 300 (see Figure 7 ), the first housing 110 is further provided with a first avoidance hole 112, the first protrusion 344 passes through the first avoidance hole 112, and extends to the outside of the housing 100, and the first protrusion 344 can move up and down along the first avoidance hole 112. Thus, the user can externally move the limiting member 300 through the first protrusion 344, so as to switch the limiting member 300 between the first position and the second position.

[0057] In this embodiment, a second fastening member 700 and a second elastic element are further provided. The second fastening member 700 is symmetrically arranged with the first fastening member 400. The second fastening member 700 has a similar structure to the first fastening member 400, except that the direction of the second hook of the second fastening member 700 is opposite to the direction of the first hook 410, that is, the second hook faces the first hook 410. The second elastic element is a second spring sheet, which is symmetrically arranged with the first spring sheet 500. The function of the second spring sheet is to make the second fastening member 700 rotate along the second direction (refer to Figure 4 , viewed vertically inward from the paper surface, the second direction is clockwise), so that the second hook catches the target object.

[0058] Through the cooperation of the first hook 410 and the second hook, the first fastening member 400 and the second fastening member 700 can smoothly clamp the target object. In another embodiment, the plug assembly can also be provided with only the first fastening member 400 and the first elastic element, without the second fastening member 700 and the second elastic element. In this case, the first hook 410 can also hook the target object, and with the cooperation of the plug 200, the first hook 410 can also clamp the target object, so as to achieve the connection between the plug 200 and the target object.

[0059] In another embodiment, the second hook and the first hook 410 may also be separated from each other. In this case, the second hook and the first hook 410 cooperate with each other to also clamp the target object.

[0060] The present invention also relates to a charging device, which includes the above-mentioned plug assembly, wherein the circuit board 600 of the plug assembly is electrically connected to the wire, and the wire is electrically connected to the power supply, so as to charge the target object connected to the plug 200.

[0061] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A buckling mechanism, characterized in that: include: case; A first buckling member, the first buckling member is rotatably connected to the housing, and a first hook is provided at one end of the first buckling member; a first elastic element, wherein the first elastic element can make the first buckling member rotate relative to the housing in a first direction, the first elastic element is a first elastic sheet, one end of the first elastic sheet is fixed to the housing, and the other end of the first elastic sheet abuts against the first buckling member; the first elastic sheet includes an upper section, the upper section is inclined, and the end of the upper section abuts against the first buckling member; A limit member, wherein the limit member is slidably connected to the shell, and when the limit member slides to a first position, the limit member abuts against the first buckle member, thereby preventing the first buckle member from rotating relative to the shell in a second direction, wherein the second direction is opposite to the first direction, and when the limit member slides to a second position, the limit member disengages from the abutment with the first buckle member, thereby allowing the first buckle member to rotate relative to the shell in the second direction.

2. The buckling mechanism according to claim 1, characterized in that: The shell is provided with a first card slot and a second card slot, and the limiting member is provided with a first card point. When the limiting member slides to the first position, the first card point is inserted into the first card slot, and when the limiting member slides to the second position, the first card point is inserted into the second card slot.

3. The buckling mechanism according to claim 1, characterized in that: The limiting member is provided with a first protrusion, the shell is provided with a first avoidance hole, the first protrusion passes through the first avoidance hole and extends to the outside of the shell, and the first protrusion can slide along the first avoidance hole.

4. The buckling mechanism according to claim 1, characterized in that: A second protrusion is provided on the first fastening member, and a second avoidance hole is provided on the shell. The second protrusion passes through the second avoidance hole and extends outside the shell. When the second protrusion passes through the second avoidance hole and moves toward the shell, the first fastening member rotates relative to the shell along the second direction.

5. The buckling mechanism according to claim 4, characterized in that: The first fastening member can rotate relative to the housing around a first axis, and the second protrusion and the first hook are respectively located on two sides of the first axis.

6. The buckling mechanism according to any one of claims 1 to 5, characterized in that: Also includes: a second fastening member, the second fastening member being rotatably connected to the housing, a second hook being disposed at one end of the second fastening member, the first hook facing or away from the second hook; A second elastic element, wherein the second elastic element can enable the second fastening member to rotate relative to the shell along the second direction, and when the limiting member slides to the first position, the limiting member abuts against the second fastening member, thereby preventing the second fastening member from rotating relative to the shell along the first direction, and when the limiting member slides to the second position, the limiting member disengages from the abutment with the second fastening member, thereby allowing the second fastening member to rotate relative to the shell along the first direction.

7. A plug assembly, characterized in that: It comprises the snap-fit ​​mechanism as described in any one of claims 1 to 6, and also comprises a plug and a circuit board, wherein both the plug and the circuit board are fixed on the shell, and the plug is provided with a pin, and the pin is electrically connected to the circuit on the circuit board.

8. The plug assembly according to claim 7, characterized in that: The circuit board is fixed on the housing by snapping, or the circuit board is locked and fixed on the housing.

9. A charging device, characterized in that: The plug assembly comprises the plug assembly as claimed in claim 8.

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