Frame connecting structure

Abstract

The utility model discloses a frame connecting structure, and relates to the field of connecting structures, in particular to a frame connecting structure. Comprising a first frame, a second frame, a vertical limiting piece and a movable sliding block, the second frame is provided with a second hollow channel, the movable sliding block slides in the second hollow channel, the vertical limiting piece is provided with a limiting groove, and a limiting protrusion of the movable sliding block is clamped into the limiting groove from the bottom of the vertical limiting piece. The limiting protrusions are inserted into the limiting grooves, so that two-dimensional connection of the first frame and the second frame on the horizontal plane is guaranteed. The movable rocker is pulled and pressed down, the gap between the vertical limiting piece and the second frame is further pressed, a plurality of protrusions on the vertical limiting piece are matched with the movable sliding block and the second frame structure, and it is guaranteed that the first frame and the second frame are fixedly connected in the vertical direction. According to the frame connecting structure, the position relation is determined in the three-dimensional space through two-time insertion, the frame connecting structure has stability after being assembled, and the direct insertion mode is simple and easy to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of connecting structure, in particular to a frame connecting structure. BACKGROUND

[0002] At present, many large frame structures such as lamp frame structures have been widely used in various large business places. In order to adapt to different occasions and save production cost, the traditional light box with light panel device is usually made into standard shape and size. In order to reduce transportation cost, the general light box is usually combined and disassembled. At present, the general light box frame combination method is simple, but there are problems of unstable connection and easy to collapse. In order to connect firmly, some manufacturers use complex connection structure to assemble, but the installation cost is too high, the time is too long, and the professional degree of installation is required. In view of the problems in the above related technology, both simple combination and complex assembly have defects. The present application provides a new frame connecting structure, which avoids the complexity of installation while ensuring the firmness and stability after assembly, and is more flexible and simple to assemble. CONTENT OF THE UTILITY MODEL

[0003] In order to overcome the shortcomings of the related art, the present application provides a frame connecting structure.

[0004] A frame connecting structure, comprising a first frame and a second frame, the first frame is provided with a vertical limiting piece at the end, the second frame is provided with a movable sliding block at the end, the second frame is internally provided with a second hollow channel, the movable sliding block is provided with a movable rocker, the movable rocker controls the movable sliding block to slide in the second hollow channel, the bottom of the vertical limiting piece is provided with a limiting recess, the end of the movable sliding block is provided with a limiting protrusion matched with the limiting recess, the limiting protrusion is clamped into the limiting recess from the bottom of the vertical limiting piece, and the limiting protrusion can slide back and forth along the length direction of the second frame in the limiting recess; the vertical limiting piece is further provided with a plurality of strip-shaped protrusions in the direction facing the movable sliding block, when the movable rocker controls the movable sliding block to drive the vertical limiting piece to move towards the inside of the second hollow channel, the plurality of strip-shaped protrusions are inserted into the second hollow channel, and the plurality of strip-shaped protrusions are matched with the inner wall of the second hollow channel in cooperation with the connecting part of the movable sliding block.

[0005] Further, the first frame is internally provided with a first hollow channel, the vertical limiting piece comprises a vertical rod and a base, the vertical rod and the base are fixedly connected, the vertical rod is inserted into the first hollow channel, and the first frame and the vertical limiting piece are provided with screw holes at corresponding positions, and the first frame and the vertical limiting piece are fixedly connected through the screw.

[0006] Further, the width of the top layer of the second hollow channel is smaller than that of the bottom layer, the two side surfaces of the channel are sequentially distributed downward along the steps, and the steps are provided as three layers.

[0007] Further, the first frame is provided with a first clamping groove and a second clamping groove on two sides, the second frame is provided with a third clamping groove and a fourth clamping groove on two sides, the vertical limiting piece is provided with a fifth clamping groove and a sixth clamping groove on two sides, the first clamping groove, the third clamping groove and the fifth clamping groove are matched, and the second clamping groove, the fourth clamping groove and the sixth clamping groove are matched.

[0008] Further, the plurality of strip-shaped protrusions include one horizontal strip-shaped protrusion and two vertical strip-shaped protrusions.

[0009] Further, the movable slider is provided with a rotating groove, the second frame is provided with a square hole at a position corresponding to the rotating groove on the top layer of the channel, and the movable rocker can rotate in the rotating groove to drive the movable slider to move.

[0010] Further, the movable rocker includes a handle portion, a curved portion and a core biasing protrusion, the handle portion, the curved portion and the core biasing protrusion are integrally formed, the handle portion is rotated to drive the core biasing protrusion to generate a force on the inner wall of the rotating groove, and the movable slider is pushed to move.

[0011] Further, the second hollow channel is provided with two first insertion holes on the side wall, the rotating groove of the movable slider is provided with two waist-shaped holes on the side wall, the movable rocker is provided with a second insertion hole on the side wall, the rotating shaft passes through the first insertion hole, the waist-shaped hole, the second insertion hole, the other side waist-shaped hole and the other side first insertion hole, the core biasing protrusion of the movable rocker can rotate around the rotating shaft in the rotating groove to drive the movable slider to slide in the second hollow channel, and the rotating shaft is accommodated in the waist-shaped hole during the movement of the movable slider.

[0012] Further, the rotating groove vertically penetrates the movable slider, and the bottom of the rotating groove is provided with an accommodation opening.

[0013] Further, the movable slider is provided with a reinforcing assembly inside, the core biasing protrusion is provided with a limiting surface, the limiting surface of the movable rocker abuts against the side wall of the rotating groove when the movable rocker is completely rotated, and the bottom of the curved portion of the movable rocker abuts against the top of the reinforcing assembly of the movable slider.

[0014] In summary, the present application has at least one of the following beneficial technical effects:

[0015] 1. The limiting protrusion of the movable slider inserts into the limiting groove at the bottom of the vertical limiting component, ensuring the connection of the first and second frames in both the front-back and left-right dimensions on the horizontal plane. By moving the handle of the movable rocker arm and pressing it down, the movable slider slides in the second hollow channel, controlling the movable slider, already inserted with the vertical limiting component, to move further into the second hollow channel, further tightening the gap between the vertical limiting component and the second frame. Furthermore, the multiple protrusions on the vertical limiting component structurally engage with the upper groove of the movable slider and the second hollow channel of the second frame, ensuring a fixed connection of the first and second frames in the vertical direction, preventing relative vertical displacement. Through two insertions, the positional relationship is determined in three dimensions of space. The assembled frame connection structure is stable, and the direct insertion and manipulation method is simple and easy to operate.

[0016] 2. The vertical rod of the vertical limiting component is inserted into the first hollow channel of the first frame. Screw holes are provided at corresponding positions on the first frame and the vertical limiting component. The first frame and the vertical limiting component are fixedly connected by screws, which improves the stability of the connection between the vertical limiting component and the first frame.

[0017] 3. Multiple slots are provided on both sides of each frame to facilitate the assembly of light strips, canvases, background cloths, backlight panels, or other structural components. The first, third, and fifth slots fit together, as do the second, fourth, and sixth slots.

[0018] 4. The movable rocker arm drives the movable slider to move in the second hollow channel. The movable rocker arm controls the movement of the movable slider, thereby controlling the connection between the movable slider and the vertical limiting component. It is simple, convenient and easy to operate.

[0019] 5. The movable slider is provided with a rotating groove, which provides space for the movable rocker arm to rotate. The movable rocker arm rotates around the rotating shaft in the rotating groove, which drives the movable slider to move in the second hollow channel. During the movement of the movable slider, it makes way for the rotating shaft through the waist-shaped hole. The movable rocker arm is easy to operate and use, and saves production costs.

[0020] 6. The movable rocker handle drives the eccentric protrusion to exert force on the inner wall of the rotating groove, pushing the movable slider to move. Operation is simple and convenient. The rotating groove runs vertically through the movable slider, providing the movable rocker with ample rotation space.

[0021] 7. The movable slider is equipped with a reinforcing component, and the eccentric protrusion is provided with a limiting surface. When the movable rocker is fully rotated down, the limiting surface of the movable rocker abuts against the side wall of the rotating groove, and the bottom of the bent part of the movable rocker abuts against the top of the reinforcing component of the movable slider. Attached Figure Description

[0022] Figure 1 This is an exploded view of the vertical limiting member, movable slider, and second frame structure in an embodiment of this application.

[0023] Figure 2 is a structural schematic diagram of the whole structure of an embodiment of the application after assembly.

[0024] Figure 3 is a structural schematic diagram of a second hollow channel of an embodiment of the application.

[0025] Figure 4 is a structural schematic diagram of a vertical limiting member of an embodiment of the application.

[0026] Figure 5 is a structural schematic diagram of a movable sliding block of an embodiment of the application.

[0027] Figure 6 is a structural schematic diagram of a let-in opening of an embodiment of the application.

[0028] Figure 7 is a structural schematic diagram of a movable rocker of an embodiment of the application.

[0029] Figure 8 is a bottom view of the vertical limiting member and the movable sliding block of an embodiment of the application in cooperation and compression.

[0030] Mark No. Description 100, first frame; 102, first clamping groove; 103, second clamping groove; 200, second frame; 201, second hollow channel; 202, third clamping groove; 203, fourth clamping groove; 204, square hole; 205, first insertion hole; 206, rotating shaft; 210, channel bottom layer; 211, channel second layer; 212, channel third layer; 213, channel top layer; 300, vertical limiting member; 302, fifth clamping groove; 303, sixth clamping groove; 304, vertical rod; 305, base; 306, limiting recess; 307, horizontal bar protrusion; 308, vertical bar protrusion; 400, movable sliding block; 401, limiting protrusion; 402, limiting small protrusion; 403, limiting top protrusion; 404, rotating groove; 405, waist-shaped hole; 406, reinforcing assembly; 407, upper recess; 409, let-in opening; 410, connecting part; 411, side wall inclined surface; 412, top inclined surface; 500, movable rocker; 501, core deviation protrusion; 502, curved part; 503, handle part; 504, limiting surface; 506, second insertion hole. DETAILED DESCRIPTION

[0031] The following will be described in detail in combination with the accompanying drawings. Figures 1-8 The application will be further described in detail.

[0032] The embodiment of the application discloses a frame connecting structure. Referring to Figure 1 , Figure 2A frame connecting structure, comprising a first frame 100, a second frame 200, a vertical limiting piece 300 and a movable slider 400, the first frame 100 and the second frame 200 are respectively provided with a first hollow channel and a second hollow channel 201. Figure 3 The shape of the second hollow channel 201 is a multi-layer "cake" channel, the width of the top layer 213 is smaller than the width of the bottom layer 210, and the two side surfaces of the channel are sequentially distributed downward along the steps. In the embodiment of the application, the steps are provided as three layers, the channel bottom layer 210 and the channel second layer 211 respectively extend outward, and the channel side wall forms a third clamping groove 202 together; the channel second layer 211 and the channel third layer 212 extend outward, and the channel side wall forms a fourth clamping groove 203 together. The third clamping groove 202 or the fourth clamping groove 203 is used for installing the related external structure of the lamp strip cloth, canvas, background cloth, backlight panel and the like. Similarly, the channel structure of the first hollow channel of the first frame 100 and the second hollow channel 201 of the second frame 200 is the same, and the two sides of the first frame 100 form a first clamping groove 102 and a second clamping groove 103.

[0033] Referring to Figure 4 The vertical limiting piece 300 comprises a vertical rod 304 and a base 305, the vertical rod 304 and the base 305 are fixedly connected, the vertical rod 304 can be inserted into the first hollow channel, and the first frame 100 and the vertical limiting piece 300 are provided with screw holes at corresponding positions, and the first frame 100 and the vertical limiting piece 300 are fixedly connected through screws, thereby improving the stability of the connection between the vertical limiting piece 300 and the first frame 100.

[0034] The vertical limiting piece 300 is provided with a fifth clamping groove 302 and a sixth clamping groove 303 on the two sides, respectively, referring to Figure 2 The first clamping groove 102, the third clamping groove 202 and the fifth clamping groove 302 are matched, and the second clamping groove 103, the fourth clamping groove 203 and the sixth clamping groove 303 are matched, thereby facilitating the assembly of the components of the lamp strip cloth, canvas, background cloth, backlight panel or other structure clamping.

[0035] Referring to Figure 8 The base 305 is provided with a limiting groove 306 at the bottom, the shape of the limiting groove 306 matches the limiting protrusion 401 on the movable slider 400, the shape of the limiting groove 306 matches the shape of the limiting protrusion 401, the thickness of the limiting groove 306 in the length direction of the second frame 200 is slightly larger than the thickness of the limiting protrusion 401, and the limiting protrusion 401 can displace a short distance in the length direction of the second frame 200 in the limiting groove 306. The shape of the limiting protrusion 401 will be described in detail below, so the limiting groove 306 will not be described here, referring to Figure 4 The surface of the limiting groove 306 facing the movable slider 400 is provided with a horizontal protrusion 307 and two vertical protrusions 308.

[0036] With reference to Figure 1 , Figure 5 and Figure 6 , the movable slider 400 is provided with a limiting protrusion 401 near one end of the vertical limiting member 300. In the embodiment of the application, the limiting protrusion 401 is approximately trapezoidal in shape. The limiting protrusion 401 is provided with limiting small protrusions 402 on both sides, and a limiting top protrusion 403 on the top. The limiting small protrusions 402 are provided with a side wall inclined surface 411 and a top inclined surface 412. The connecting part 410 of the limiting protrusion 401 and the movable slider 400 body is fixedly connected, and the top of the connecting part 410 is provided with an upper groove 407. The groove side wall on one side of the limiting protrusion 401 is provided as a guide slope. The upper groove 407 and the horizontal bar protrusion 307 and the internal shape of the back limiting groove 306 cooperate. When the handle 503 is pressed down, the guide slope, the side wall inclined surface 411 and the top inclined surface 412 all play a guiding role. The movable slider 400 slides into the second hollow channel 201, driving the vertical limiting member 300 to slide into the second hollow channel 201. When the guide slope, the side wall inclined surface 411 and the top inclined surface 412 are pressed against the inner wall of the limiting groove 306, the horizontal bar protrusion 307 can be inserted into the second hollow channel 201. At the same time, the two vertical bar protrusions 308 are also inserted into the second hollow channel 201. The horizontal bar protrusion 307, the two vertical bar protrusions 308 and the connecting part 410 of the movable slider 400 cooperate with the inner wall shape of the second hollow channel 201, further fixing the vertical limiting member 300 and the second hollow channel 201. The shape of the outer wall of the movable slider 400 body also cooperates with the inner wall shape of the second hollow channel 201, and can slide in the second hollow channel 201. The end of the movable slider 400 away from the vertical limiting member 300 is provided with a rotating groove 404, and the rotating groove 404 opens upward. The movable slider 400 is provided with a reinforcing assembly 406 beside the rotating groove 404, which is used to strengthen the structural strength of the movable slider 400. With reference to Figure 6 , the bottom of the rotating groove 404 is also hollow in the embodiment of the application. The rotating groove 404 vertically penetrates the movable slider 400, and the bottom of the rotating groove 404 forms a clearance 409. The clearance 409 is provided to cooperate with the rotation of the movable rocker 500, providing more sufficient rotation space for the movable rocker 500. The square hole 204 is provided at the position corresponding to the rotating groove 404 of the channel top layer of the second frame 200, which is used to clear the movable rocker 500.

[0037] With reference to Figure 7The movable rocker 500 comprises a handle portion 503, a bending portion 502 and a core biasing block 501, the handle portion 503, the bending portion 502 and the core biasing block 501 are integrally formed, the handle portion 503 is rotated to drive the core biasing block 501 to generate a force on the inner wall of the rotating groove 404, and the movable slider 400 is pushed to move. The rotating groove 404 provides a space for the movable rocker 500 to rotate.

[0038] With reference to Figure 1 and Figure 7 The sidewall of the second hollow channel 201 is provided with two first insertion holes 205, the sidewall of the rotating groove 404 of the movable slider 400 is provided with two waist-shaped holes 405, the sidewall of the movable rocker 500 is provided with second insertion holes 506, the rotating shaft 206 passes through the first insertion hole 205, the waist-shaped hole 405, the second insertion hole 506, the other side waist-shaped hole 405 and the other side first insertion hole 205, respectively, the core biasing block 501 of the movable rocker 500 can rotate in the rotating groove 404 around the rotating shaft 206, and the movable slider 400 is driven to slide in the second hollow channel 201. The rotating shaft 206 is accommodated in the waist-shaped hole 405 during the movement of the movable slider 400. A limiting surface 504 is arranged on the core biasing block 501, when the movable rocker 500 is completely rotated, the limiting surface 504 of the movable rocker 500 abuts against the sidewall of the rotating groove 404, and the bottom of the bending portion 502 of the movable rocker 500 abuts against the top of the reinforcing assembly 406 of the movable slider 400, and the reinforcing assembly 406 is also used for supporting and limiting the bending portion 502.

[0039] The handle portion 503 of the movable rocker 500 drives the core biasing block 501 to generate a force on the inner wall of the rotating groove 404, the movable slider 400 moves in the second hollow channel 201, the movement of the movable slider 400 is controlled by the movable rocker 500, and then the movable slider 400 is inserted into the vertical limiting piece, the operation is simple and convenient to use, and the production cost is saved.

[0040] The principle of the embodiment of the application is as follows:

[0041] When the frame needs to be assembled, the limiting protrusion 401 of the movable slider 400 is inserted into the limiting groove 306 of the vertical limiting piece 300 which has been fixedly connected with the first frame 100.

[0042] Before use, the movable rocker 500 is in the upright state, the waist-shaped hole 405 of the movable slider 400 is away from the inner wall of the first frame 100 and abuts against the rotating shaft 206, when in use, the handle part 503 of the movable rocker 500 is turned downward, the eccentric core block 501 rotates around the rotating shaft 206 in the rotating groove 404, drives the movable slider 400 to move in the second hollow channel 201 in the direction of deepening the second hollow channel 201, the movable slider 400 moves in the waist-shaped hole 405 to give way to the rotating shaft 206, the movable slider 400 drives one horizontal strip protrusion 307 and two vertical strip protrusions 308 of the vertical limiting part 300 to be inserted into the second hollow channel 201 together with the connecting part 410 of the movable slider 400. The movable rocker 500 controls the movement of the movable slider 400, and then controls the insertion of the vertical limiting part 300 and the second hollow channel 201. When the movable rocker 500 is completely turned down, the limiting surface 504 of the movable rocker 500 abuts against the sidewall of the rotating groove 404, the movable rocker 500 is in a stable state, the bottom of the curved part 502 of the movable rocker 500 abuts against the reinforcing part of the movable slider 400, the waist-shaped hole 405 of the movable slider 400 is close to the inner wall of the first frame 100 and abuts against the rotating shaft 206, and the vertical limiting part 300 is completely inserted into the second frame 200.

[0043] When the frame structure needs to be disassembled, the movable rocker 500 is turned back to the upright state, the eccentric core block 501 of the movable rocker 500 rotates around the rotating shaft 206 in the rotating groove 404, drives the movable slider 400 to move in the second hollow channel 201 in the direction away from the middle part of the second frame 200, the waist-shaped hole 405 of the movable slider 400 abuts against the inner wall of the first frame 100, and the waist-shaped hole 405 is away from the inner wall of the first frame 100 and abuts against the rotating shaft 206. The first frame 100 and the vertical limiting part 300 are loose, and the limiting protrusion 401 of the movable slider 400 is taken out from the limiting groove 306 of the vertical limiting part 300 from the bottom of the vertical limiting part 300.

[0044] In summary, the limiting protrusion 401 of the movable slider 400 is inserted into the limiting groove 306 at the bottom of the vertical limiting member 300, which guarantees the connection of the first frame 100 and the second frame 200 in the two dimensions of front and back and left and right in the horizontal plane. The handle 503 of the movable rocker 500 is pulled, and the movable rocker 500 is pressed down, so that the movable slider 400 slides in the second hollow channel 201, controls the movable slider 400 which has been inserted into the vertical limiting member 300 to move towards the inside of the second hollow channel 201, further compresses the gap between the vertical limiting member 300 and the second frame 200, and the multiple protrusions on the vertical limiting member 300 are embedded in the structure cooperation between the upper groove 407 of the movable slider 400 and the second hollow channel 201 of the second frame 200, which guarantees the fixed connection of the first frame 100 and the second frame 200 in the vertical direction, and no relative displacement in the up and down direction occurs. Through twice insertion, the positional relationship in the three-dimensional space is determined, the frame connection structure has stability after assembly, and the direct insertion and pulling mode is simple and easy to operate.

[0045] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A frame connection structure, characterized in that, The system includes a first frame (100) and a second frame (200). A vertical limiting member (300) is provided at the end of the first frame (100), and a movable slider (400) is provided at the end of the second frame (200). A second hollow channel (201) is provided inside the second frame (200). A movable rocker arm (500) is provided on the movable slider (400), which controls the movable slider (400) to slide within the second hollow channel (201). A limiting groove (306) is provided at the bottom of the vertical limiting member (300), and a limiting protrusion (401) that matches the limiting groove (306) is provided at the end of the movable slider (400). The limiting protrusion (401) is inserted into the limiting groove (306) from the bottom of the vertical limiting member (300). It can slide back and forth in the limiting groove (306) along the length of the second frame (200). The vertical limiting member (300) is also provided with multiple strip-shaped protrusions in the direction of the movable slider (400). When the movable rocker arm (500) controls the movable slider (400) to drive the vertical limiting member (300) to move into the second hollow channel (201), the multiple strip-shaped protrusions are inserted into the second hollow channel (201). The multiple strip-shaped protrusions and the connecting part (410) of the movable slider (400) cooperate with the inner wall of the second hollow channel (201).

2. The frame connection structure according to claim 1, characterized in that, The first frame (100) has a first hollow channel inside. The vertical limiting member (300) includes two parts: a vertical rod (304) and a base (305). The vertical rod (304) and the base (305) are fixedly connected. The vertical rod (304) is inserted into the first hollow channel. Screw holes are provided at corresponding positions on the first frame (100) and the vertical limiting member (300). The first frame (100) and the vertical limiting member (300) are fixedly connected by screws.

3. The frame connection structure according to claim 1, characterized in that, The width of the top layer (213) of the second hollow passage (201) is smaller than the width of the bottom layer (210). The two sides of the passage are distributed downward along the steps, and the steps are set to three layers.

4. The frame connection structure according to claim 1, characterized in that, The first frame (100) has a first slot (102) and a second slot (103) on both sides, and the second frame (200) has a third slot (202) and a fourth slot (203) on both sides; the vertical limiting member (300) has a fifth slot (302) and a sixth slot (303) on both sides. The first slot (102), the third slot (202), and the fifth slot (302) cooperate with each other, and the second slot (103), the fourth slot (203), and the sixth slot (303) cooperate with each other.

5. The frame connection structure according to claim 1, characterized in that, The multiple strip-shaped protrusions include one horizontal protrusion (307) and two vertical protrusions (308).

6. The frame connection structure according to claim 1, characterized in that, The movable slider (400) is provided with a rotating groove (404), and the top layer (213) of the channel of the second frame (200) is provided with a square hole (204) corresponding to the position of the rotating groove (404). The movable rocker (500) can rotate in the rotating groove (404) to drive the movable slider (400) to move.

7. The frame connection structure according to claim 6, characterized in that, The movable rocker arm (500) includes a handle (503), a curved part (502), and an eccentric protrusion (501). The handle (503), the curved part (502), and the eccentric protrusion (501) are integrally formed. Rotating the handle (503) causes the eccentric protrusion (501) to exert force on the inner wall of the rotating groove (404), thereby pushing the movable slider (400) to move.

8. The frame connection structure according to claim 7, characterized in that, The second hollow channel (201) has two first insertion holes (205) on its side wall. The rotating groove (404) of the movable slider (400) has two waist-shaped holes (405) on its side wall. The movable rocker arm (500) has a second insertion hole (506) on its side wall. The rotating shaft (206) passes through the first insertion hole (205), the waist-shaped hole (405), the second insertion hole (506), the waist-shaped hole (405) on the other side, and the first insertion hole (205) on the other side. The eccentric protrusion (501) of the movable rocker arm (500) can rotate around the rotating shaft (206) in the rotating groove (404), driving the movable slider (400) to slide in the second hollow channel (201). During the movement of the movable slider (400), it makes way for the rotating shaft (206) through the waist-shaped hole (405).

9. The frame connection structure according to claim 8, characterized in that, The rotating groove (404) passes vertically through the movable slider (400), and a clearance opening (409) is provided at the bottom of the rotating groove (404).

10. The frame connection structure according to claim 9, characterized in that, The movable slider (400) is provided with a reinforcing component (406) inside, and the eccentric protrusion (501) is provided with a limiting surface (504). When the movable rocker (500) is fully rotated down, the limiting surface (504) of the movable rocker (500) abuts against the side wall of the rotating groove (404), and the bottom of the bent part (502) of the movable rocker (500) abuts against the top of the reinforcing component (406) of the movable slider (400).

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