LED display screen with separable central control box

Abstract

The utility model discloses an LED display screen with a separable central control box, which comprises an LED display module, a box body and the central control box, the LED display module is arranged on the box body, the central control box is detachably connected with the box body, the central control box comprises a shell, a power supply module, a receiving card and an adapter plate, and the power supply module, the receiving card and the adapter plate are arranged in the shell. An interface is arranged on the shell, the adapter plate is connected with a golden finger, the golden finger is arranged in the interface in a penetrating manner, and the golden finger is detachably connected with a slot on the LED display module; rotary locks are arranged at the two ends of the shell, lock catches are arranged on the box body, and the rotary locks are matched with the lock catches so as to lock or unlock the connection between the central control box and the box body. According to the LED display screen, the central control box is detachably connected with the box body and can serve as an independent accessory, and maintenance and replacement are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of LED display screens, and particularly relates to an LED display screen with a separable central control box. Background Art

[0002] At present, LED display screens are more and more widely used. In rental LED display screens, the central control box is fixed on the box body. When components such as the adapter board on the LED display module fail, the entire LED display screen needs to be removed, and then the central control box needs to be removed from the box body to repair and replace components such as the adapter board on the LED display module. Such operations are cumbersome and not easy to maintain and replace. Summary of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the utility model provides an LED display screen with a separable central control box. The central control box is detachably connected to the box body and can be used as an independent accessory, which is convenient for maintenance and replacement, more convenient to use, and has a wider application.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] An LED display screen with a separable central control box includes an LED display module, a box body, and a central control box. The LED display module is installed on the box body. The central control box is detachably connected to the box body. The central control box includes a shell and a power module, a receiving card, and an adapter board arranged inside the shell. The power module and the receiving card are both electrically connected to the adapter board. An interface is arranged on the shell. The adapter board is connected with a gold finger, and the gold finger passes through the interface. The gold finger is detachably connected to a slot on the LED display module. A power aviation socket, a signal aviation socket, and a test button are also arranged on the shell. The power aviation socket is electrically connected to the power module. The signal aviation socket and the test button are electrically connected to the adapter board battery core. Rotating locks are arranged at both ends of the shell, and a lock catch is arranged on the box body. The rotating locks cooperate with the lock catch to lock or unlock the connection between the central control box and the box body.

[0006] As a further improvement of the above technical solution, the rotating lock includes a rotating lock main body, a rotating lock handle, and a lock piece. The rotating lock handle and the lock piece are respectively connected to both ends of the rotating lock main body. The rotating lock main body is rotatably connected to the shell. The lock catch includes a lock groove. A lock plate is arranged at the notch of the lock groove. A lock hole is arranged on the lock plate. The length of the lock piece is less than the length of the lock hole and greater than the width of the lock hole.

[0007] As a further improvement of the above technical solution, the rotary lock body includes a lock body provided with a central hole, a locking thread is provided on the outer side of the lock body, an installation hole is provided on the housing, and the lock body passes through the installation hole and is locked to the housing by a nut.

[0008] As a further improvement of the above technical solution, an anti-slip gasket is provided between the nut and the housing, anti-slip teeth are provided on the anti-slip gasket, and anti-loosening teeth are provided on the nut.

[0009] As a further improvement of the above technical solution, the rotary lock body further includes a main shaft disposed in the central hole of the lock body, the rotary lock handle includes a handle portion and a rod portion, a hinge seat is provided at the end of the main shaft, and the rod portion is rotatably connected to the hinge seat.

[0010] As a further improvement of the above technical solution, a groove is provided on the end face of the rod portion, an arc-shaped connecting surface is provided between the side wall and the end face of the rod portion, a first receiving hole is provided on the main shaft, a first ball is provided in the first receiving hole, and a first elastic member is connected between the first ball and the bottom of the first receiving hole. The first elastic member is used to provide an elastic force to drive the first ball to abut against the rotary lock handle. When the rotary lock handle rotates to be coaxial with the main shaft, the first ball is embedded in the groove. When the rotary lock handle rotates to be perpendicular to the main shaft, the first ball abuts against the arc-shaped connecting surface of the rod portion.

[0011] As a further improvement of the above technical solution, a second receiving hole is provided at one end of the main shaft away from the rotary lock handle, a movable shaft is slidably connected in the second receiving hole, a lock piece is connected to one end of the movable shaft away from the second receiving hole, and a second elastic member is connected between the movable shaft and the bottom of the second receiving hole. The second elastic member provides an elastic force to drive the movable shaft to move away from the inside of the second receiving hole.

[0012] As a further improvement of the above technical solution, the lock piece is locked to the end of the movable shaft by a screw.

[0013] As a further improvement of the above technical solution, an arc-shaped opening is provided on the side wall of the second receiving hole, a positioning rod is provided on the movable shaft, and the positioning rod is slidably connected in the arc-shaped opening. When the positioning rod moves to one end of the arc-shaped opening close to the lock piece, the second elastic member is in a natural state. When the positioning rod moves to the other end of the arc-shaped opening, the second elastic member is in a compressed state.

[0014] As a further improvement of the above technical solution, a third receiving hole is provided on the main shaft. The third receiving hole is perpendicular to the axis of the main shaft. A second ball is provided in the third receiving hole. A positioning groove is provided on the side wall of the central hole of the lock body. A third elastic member is connected between the second ball and the bottom of the third receiving hole. The third elastic member is used to provide an elastic force to drive the second ball to be inserted into the positioning groove.

[0015] The beneficial effect of the present utility model is that in the present utility model, the central control box is made into a separate accessory, and components such as the adapter plate are installed in the central control box, instead of setting the adapter plate on the LED display module, and the central control box is detachably connected to the box body. When components such as the adapter plate of the LED display screen fail, the central control box can be directly removed, thus facilitating the maintenance and replacement of components such as the adapter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is an assembly schematic diagram of the LED display screen in the embodiment of the present utility model;

[0018] Figure 2 is a structural exploded view of the LED display screen in the embodiment of the present utility model;

[0019] Figure 3 is a structural schematic diagram of the lock buckle in the embodiment of the present utility model;

[0020] Figure 4 is the front view of the central control box in the embodiment of the present utility model;

[0021] Figure 5 is the axonometric view of the central control box in the embodiment of the present utility model;

[0022] Figure 6 is the structural explosion of the central control box in the embodiment of the present utility model Figure 1 ;

[0023] Figure 7 is the structural explosion of the central control box in the embodiment of the present utility model Figure 2 ;

[0024] Figure 8 is the cross-section of the central control box along the axis of the rotary lock Figure 1 ;

[0025] Figure 9 is the cross-section of the central control box along the axis of the rotary lock Figure 2 ;

[0026] Figure 10 is the structural exploded view of the front view of the rotary lock in the embodiment of the present utility model;

[0027] Figure 11 It is a structural split view of the rotation lock in the axial direction of the embodiment of the present utility model.

[0028] Reference numerals: 100, LED display module; 200, box body; 210, lock catch; 211, lock groove; 212, lock plate; 213, lock hole; 220, avoidance hole; 300, central control box; 310, housing; 311, rear cover; 312, front cover; 313, mounting hole; 320, rotation lock; 321, rotation lock handle; 322, first ball; 323, first elastic member; 324, hinge seat; 3241, fixing piece; 3242, hinge shaft; 325, main shaft; 3251, first receiving hole; 3252, second receiving hole; 3253, third receiving hole; 326, third elastic member; 327, second ball; 328, arc-shaped opening; 329, first gasket; 3210, anti-slip gasket; 3211, nut; 3212, lock body; 3213, second elastic member; 3214, movable shaft; 3215, positioning rod; 3216, lock piece; 3217, screw; �218, positioning groove; 3219, groove; 330, interface; 340, power supply aviation socket; 350, signal aviation socket; 360, test button; 370, adapter board; 371, gold finger; 380, power supply module. Detailed implementation manners

[0029] Subsequently, the concept, specific structure and technical effects of the present utility model will be clearly and completely described in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present utility model. In addition, all the connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the more optimal connection structure that can be formed by adding or reducing connection accessories according to the specific implementation situation. For example, fixed connection / fixed installation can be selected from screw connection, bolt connection, pin connection, key connection, bonding, mortise and tenon connection, welding, riveting and other methods as required. For example, detachable connection can be selected from screw connection, bolt connection, threaded connection, snap connection, mortise and tenon connection, magic tape connection and other methods as required. The various technical features in the creation of the present utility model can be combined with each other without conflicting with each other.

[0030] Refer to Figure 1 、 Figure 2 、 Figure 6 and Figure 7The embodiment of the present invention provides an LED display screen with a detachable central control box 300. The LED display screen includes an LED display module 100, a box body 200 and a central control box 300. The LED display module 100 is installed on the box body 200. The central control box 300 includes a shell 310 and a power module 380, a receiving card, and an adapter board 370 arranged inside the shell 310. The power module 380 and the receiving card are both electrically connected to the adapter board 370. The shell 310 is electrically connected to the receiving card. 10 is provided with an interface 330, and the adapter plate 370 is connected to a gold finger 371, and the gold finger 371 is inserted into the interface 330. The gold finger 371 is detachably connected to the slot on the LED display module 100. In addition, the box body 200 is provided with an avoidance hole 220 for avoiding the interface 330. When the interface 330 is inserted into the avoidance hole 220, the gold finger 371 is connected to the slot, thereby providing signal input and power input for the LED display module 100.

[0031] Furthermore, the outer ring of the interface 330 is provided with a first sealing ring, and the outer ring of the slot is also provided with a second sealing ring. When the gold finger 371 is connected to the slot, the first sealing ring is used to seal the gap between the outer wall of the interface 330 and the avoidance hole 220, and the second sealing ring is used to seal the gap between the slot and the inner wall of the interface 330.

[0032] The shell 310 is also provided with a power supply aviation socket 340, a signal aviation socket 350 and a test button 360. The power supply aviation socket 340 is electrically connected to the power module 380 for connecting to an external power source to facilitate power supply; the signal aviation socket 350 is connected to the adapter board 370 battery cell for connecting to an external signal source to facilitate providing signal data so that the LED display screen displays an image; the test button 360 is connected to the adapter board 370 battery cell for debugging the color, brightness, contrast and other parameters of the LED display screen to evaluate the performance and status of the LED display screen to ensure its normal operation and achieve the expected display effect.

[0033] In this embodiment, the central control box 300 is detachably connected to the box body 200. For details, refer to Figure 2 、 Figure 4 and Figure 5, rotating locks 320 are provided at both ends of the housing 310, a lock catch 210 is provided on the box body 200, and the rotating locks 320 cooperate with the lock catch 210 to lock or unlock the connection between the central control box 300 and the box body 200. That is, when installing the central control box 300, align the interface 330 on the central control box 300 with the avoidance hole 220 on the box body 200 and insert it. Then, operate the rotating lock 320 to make it engage with the lock catch 210, so that the central control box 300 and the box body 200 are in a locked state, and the central control box 300 cannot fall off the box body 200, realizing the installation of the central control box 300. When it is necessary to remove the central control box 300, only need to operate the rotating lock 320 in the reverse direction to release the lock between the central control box 300 and the box body 200, and then the central control box 300 can be pulled out. In addition, the housing 310 of the central control box 300 includes a front cover 312 and a rear cover 311 that are detachably connected, and the front cover 312 and the rear cover 311 are connected by snap connection, which is convenient for opening the central control box 300 and facilitating the maintenance and replacement of components such as adapter plates.

[0034] Further, referring to Figures 8 - 11 , the rotating lock 320 includes a rotating lock 320 main body, a rotating lock handle 321, and a lock piece 3216. The rotating lock handle 321 and the lock piece 3216 are respectively connected to both ends of the rotating lock 320 main body, and the rotating lock 320 main body is rotatably connected to the housing 310; referring to Figure 3 , the lock catch 210 includes a lock groove 211, a lock plate 212 is provided at the notch of the lock groove 211, a lock hole 213 is provided on the lock plate 212, and the length of the lock piece 3216 is less than the length of the lock hole 213 and greater than the width of the lock hole 213. That is, when the lock piece 3216 is parallel to the length direction of the lock hole 213, the lock piece 3216 can pass through the lock hole 213 and enter the lock groove 211. Then, twist the rotating lock handle 321 to drive the lock piece 3216 to rotate 90°, so that the lock piece 3216 is perpendicular to the length direction of the lock hole 213. In this way, the lock piece 3216 will be blocked by the lock plate 212, that is, the central control box 300 cannot be separated from the box body 200 outward.

[0035] In this embodiment, referring to Figures 8 - 11 , the rotating lock 320 main body includes a lock body 3212 provided with a central hole. The lock body 3212 is in a stepped shape, and a stepped installation hole 313 is provided on the rear cover 311 of the housing 310. The lock body 3212 passes through the installation hole 313, a first gasket 329 is provided between the lock body 3212 and the rear cover 311, and a locking thread is provided on the outside of the lock body 3212 and is locked to the rear cover 311 by a nut 3211, thereby realizing the installation of the rotating lock 320.

[0036] Further, an anti-slip gasket 3210 is provided between the nut 3211 and the housing 310. The anti-slip gasket 3210 is provided with anti-slip teeth, and the nut 3211 is provided with anti-loosening teeth. When the nut 3211 is tightened, the anti-slip teeth and the anti-loosening teeth can prevent the nut 3211 from loosening, thereby improving the stability of the rotary lock 320 after installation.

[0037] In this embodiment, referring to Figures 8 - 11 , the main body of the rotary lock 320 further includes a main shaft 325. The main shaft 325 is disposed in the central hole of the lock body 3212. A clearance fit is adopted between the main shaft 325 and the lock body 3212, that is, the main shaft 325 can rotate within the lock body 3212. The rotary lock handle 321 is connected to one end of the main shaft 325, and the lock piece 3216 is connected to the other end of the main shaft 325. Thus, rotating the rotary lock handle 321 can drive the main shaft 325 to rotate, and then drive the lock piece 3216 to rotate.

[0038] Further, the rotary lock handle 321 includes a handle portion and a rod portion. An articulated seat 324 is provided at the end of the main shaft 325. The rod portion is rotatably connected to the articulated seat 324. Specifically, the articulated seat 324 includes two fixing pieces 3241 oppositely disposed at the end of the main shaft 325 and an articulated shaft 3242 connecting the two fixing pieces 3241. An articulated hole is provided on the rod portion, and the articulated shaft 3242 is disposed in the articulated hole with a clearance fit, thereby realizing the rotation of the rotary lock handle 321 relative to the main shaft 325. In this way, the rotary lock handle 321 can be rotated to a use state (the rotary lock handle 321 is coaxial with the main shaft 325) or a storage state (the rotary lock handle 321 is perpendicular to the main shaft 325 and parallel to the surface of the rear cover 311).

[0039] Further, a groove 3219 is provided on the end face of the rod portion away from the handle portion. An arc-shaped connecting surface is provided between the side wall and the end face of the rod portion. A first receiving hole 3251 is provided along the axis of the main shaft 325. A first ball 322 is arranged in the first receiving hole 3251. A first elastic member 323 (a spring is used) is connected between the first ball 322 and the bottom of the first receiving hole 3251. The first elastic member 323 is used to provide an elastic force to drive the first ball 322 to abut against the rotary lock handle 321. Therefore, when the rotary lock handle 321 rotates to be coaxial with the main shaft 325 (in the use state), the first ball 322 is embedded into the groove 3219 under the elastic force of the first elastic member 323, so as to prevent the rotary lock handle 321 and the main shaft 325 from relatively rotating without external force, and make the rotary lock handle 321 stable in the use state; when the rotary lock handle 321 rotates to be perpendicular to the main shaft 325 (in the storage state), the first ball 322 abuts against the arc-shaped connecting surface of the rod portion, so as to prevent the rotary lock handle 321 and the main shaft 325 from relatively rotating without external force, and make the rotary lock handle 321 stable in the storage state; and when the rotary lock handle 321 is forcibly rotated under the action of external force, the second elastic member 3213 can be compressed, and the first ball 322 leaves the groove 3219 or the arc-shaped connecting surface, realizing the rotation of the rotary lock handle 321.

[0040] In this embodiment, referring to Figures 8 - 11 , a second receiving hole 3252 is provided at one end of the main shaft 325 away from the rotary lock handle 321. A movable shaft 3214 is slidably connected in the second receiving hole 3252. The lock piece 3216 is locked to one end of the movable shaft 3214 away from the second receiving hole 3252 by a screw 3217. A second elastic member 3213 (a spring is used) is connected between the movable shaft 3214 and the bottom of the second receiving hole 3252. The second elastic member 3213 provides an elastic force to drive the movable shaft 3214 to move away from the inside of the second receiving hole 3252.

[0041] Specifically, two oppositely arranged arc-shaped openings 328 are provided on the side wall of the second receiving hole 3252. A positioning rod 3215 is provided on the movable shaft 3214. The two ends of the positioning rod 3215 are respectively slidably connected to the two arc-shaped openings 328. The arc-shaped opening 328 includes a locking end and a pop-up end. The locking end is close to the rotary lock handle 321 and is perpendicular to the axis of the movable shaft 3214. The pop-up end is close to the lock piece 3216 and is parallel to the axis of the movable shaft 3214. That is, when the positioning rod 3215 is located at the locking end of the arc-shaped opening 328, the second elastic member 3213 is in a compressed state. Rotating the rotary lock handle 321 drives the main shaft 325 to rotate. At this time, the positioning rod 3215 slides in the arc-shaped opening 328. When the positioning rod 3215 moves out of the locking end, under the action of the second elastic member 3213, the positioning rod 3215 is driven to move towards the pop-up end, that is, the movable shaft 3214 is driven to move towards the second receiving hole 3252.

[0042] In addition, due to the radian setting of the arc-shaped opening 328, when the main shaft 325 rotates 180°, when the positioning rod 3215 moves from one end of the arc-shaped opening 328 to the other end, the movable shaft 3214 rotates 90°. Specifically, when the positioning rod 3215 is located at the pop-up end, the lock piece 3216 is parallel to the length direction of the lock hole 213. After the lock piece 3216 passes through the lock hole 213 and moves into the lock groove 211, rotate the rotary lock handle 321 by 180°. At this time, the positioning rod 3215 moves from the pop-up end of the arc-shaped opening 328 to the locking end, that is, at this time the movable shaft 3214 rotates 90°, so that the lock piece 3216 is perpendicular to the length direction of the lock hole 213, that is, the lock piece 3216 cannot move out of the lock groove 211. During this process, the movable shaft 3214 will move into the second receiving hole 3252, that is, drive the lock piece 3216 to move towards the lock plate 212. When the positioning rod 3215 is located at the locking end of the arc-shaped opening 328, the lock piece 3216 abuts against the lock plate 212, so that the central control box 300 is locked on the box body 200. When the central control box 300 needs to be removed, rotate the rotary lock handle 321 in the reverse direction by 180°. The positioning rod 3215 moves from the locking end of the arc-shaped opening 328 to the pop-up end, and the movable shaft 3214 rotates 90°, so that the lock piece 3216 is parallel to the length direction of the lock hole 213, that is, the lock piece 3216 can move out of the lock groove 211. At the same time, during this process, under the restoring force of the second elastic member 3213, the movable shaft 3214 will move away from the second receiving hole 3252, that is, drive the lock piece 3216 to move away from the lock plate 212. The lock piece 3216 no longer abuts against the lock plate 212, so that the central control box 300 can be directly removed.

[0043] In this embodiment, referring to Figures 8 - 11 , a third receiving hole 3253 is provided on the main shaft 325. The third receiving hole 3253 is perpendicular to the axis of the main shaft 325. A second ball 327 is disposed in the third receiving hole 3253. A positioning groove 3218 is provided on the side wall of the central hole of the lock body 3212. A third elastic member 326 (a spring is used) is connected between the second ball 327 and the bottom of the third receiving hole 3253. The third elastic member 326 is configured to provide an elastic force to drive the second ball 327 to engage in the positioning groove 3218. Further, the positioning groove 3218 includes a first positioning groove 3218 and a second positioning groove 3218. The included angle between the first positioning groove 3218 and the second positioning groove 3218 is 180°. That is, when the rotary lock handle 321 rotates 180° to be in the unlocking state or the locking state, the second ball 327 engages in the first positioning groove 3218 and the second positioning groove 3218 respectively. Thus, after the rotary lock handle 321 is rotated to the unlocking state or the locking state, the rotary lock handle 321 will not rotate without external force, and the rotary lock handle 321 is stably in the unlocking state or the locking state. When the rotary lock handle 321 is forcibly rotated under external force, the third elastic member 326 can be compressed, and the second ball 327 leaves the first positioning groove 3218 and the second positioning groove 3218, so that the rotation operation of the rotary lock handle 321 can be realized.

[0044] The above is a specific description of the preferred embodiment of the present invention, but the present invention is not limited to the above embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An LED display screen with a separable central control box, comprising an LED display module, a box body and a central control box, wherein the LED display module is installed on the box body, and is characterized in that: The central control box is detachably connected to the box body. The central control box includes a housing and a power module, a receiving card, and a transfer board disposed inside the housing. The power module and the receiving card are both electrically connected to the transfer board. An interface is provided on the housing. The transfer board is connected with a gold finger, and the gold finger passes through the interface. The gold finger is detachably connected to a slot on the LED display module. A power aviation socket, a signal aviation socket, and a test button are further provided on the housing. The power aviation socket is electrically connected to the power module, and the signal aviation socket and the test button are electrically connected to the transfer board battery core. Rotating locks are provided at both ends of the housing, and a lock catch is provided on the box body. The rotating locks cooperate with the lock catch to lock or unlock the connection between the central control box and the box body.

2. The LED display screen according to claim 1, wherein: The rotating lock includes a rotating lock body, a rotating lock handle, and a lock piece. The rotating lock handle and the lock piece are respectively connected to both ends of the rotating lock body. The rotating lock body is rotatably connected to the housing. The lock catch includes a lock groove. A lock plate is provided at the notch of the lock groove, and a lock hole is provided on the lock plate. The length of the lock piece is less than the length of the lock hole and greater than the width of the lock hole.

3. The LED display screen according to claim 2, wherein: The rotating lock body includes a lock body provided with a central hole. A locking thread is provided on the outer side of the lock body. An installation hole is provided on the housing. The lock body passes through the installation hole and is locked to the housing by a nut.

4. The LED display screen according to claim 3, wherein: An anti-slip gasket is provided between the nut and the housing. Anti-slip teeth are provided on the anti-slip gasket, and anti-loosening teeth are provided on the nut.

5. The LED display screen according to claim 3, wherein: The rotating lock body further includes a main shaft disposed in the central hole of the lock body. The rotating lock handle includes a handle portion and a rod portion. A hinge seat is provided at the end of the main shaft, and the rod portion is rotatably connected to the hinge seat.

6. The LED display according to claim 5, characterized in that: A groove is provided on the end face of the rod portion. An arc-shaped connecting surface is provided between the side wall and the end face of the rod portion. A first receiving hole is provided on the main shaft, and a first ball is provided in the first receiving hole. A first elastic member is connected between the first ball and the bottom of the first receiving hole. The first elastic member is used to provide an elastic force to drive the first ball to abut against the rotating lock handle. When the rotating lock handle rotates to be coaxial with the main shaft, the first ball is embedded in the groove. When the rotating lock handle rotates to be perpendicular to the main shaft, the first ball abuts against the arc-shaped connecting surface of the rod portion.

7. The LED display according to claim 5, wherein: A second receiving hole is provided at one end of the main shaft away from the rotating lock handle. A movable shaft is slidably connected in the second receiving hole. The lock piece is connected to one end of the movable shaft away from the second receiving hole. A second elastic member is connected between the movable shaft and the bottom of the second receiving hole. The second elastic member provides an elastic force to drive the movable shaft to move away from the inside of the second receiving hole.

8. The LED display according to claim 7, wherein: The lock piece is locked to the end of the movable shaft by a screw.

9. The LED display according to claim 7, wherein: An arc-shaped opening is provided on the side wall of the second receiving hole. A positioning rod is provided on the movable shaft, and the positioning rod is slidably connected in the arc-shaped opening. When the positioning rod moves to one end of the arc-shaped opening close to the lock piece, the second elastic member is in a natural state. When the positioning rod moves to the other end of the arc-shaped opening, the second elastic member is in a compressed state.

10. The LED display screen according to claim 5, wherein: A third receiving hole is provided on the main shaft. The third receiving hole is perpendicular to the axis of the main shaft. A second ball is provided in the third receiving hole. A positioning groove is provided on the side wall of the central hole of the lock body. A third elastic member is connected between the second ball and the bottom of the third receiving hole. The third elastic member is used to provide an elastic force to drive the second ball to be embedded in the positioning groove.

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