LED display screen

Abstract

This invention provides an LED display screen, comprising: a cabinet; LED modules mounted on the cabinet; a power supply box detachably mounted on the cabinet; a connecting lock including a lever and a locking block, the lever being rotatably mounted on one of the power supply box and the cabinet, and the locking block being rotatably mounted on the other of the power supply box and the cabinet, the rotation center of the lever coinciding with the rotation center of the locking block, one end of the lever having an opening slot, the locking block being inserted into the opening slot through the slot, so that the lever can drive the locking block to rotate during switching between the unlocked and locked positions; and a limiting member mounted on the power supply box or the cabinet, which, when the lever is in the unlocked position, avoids the opening slot to allow the locking block to disengage from the slot; and when the lever is in the locked position, the limiting member stops the locking block to prevent the locking block from disengaging from the slot. The technical solution provided by this application solves the problem of complex operation when disassembling and assembling the power supply box in related technologies.

Description

Technical Field

[0001] This invention relates to the field of electronic product technology, and more specifically, to an LED display screen. Background Technology

[0002] With the development of LED technology, LED displays, which use LEDs as the light source, are becoming increasingly common in daily life, greatly enriching people's lives. LED displays primarily change the content displayed on the screen by controlling the working state of the light-emitting diodes.

[0003] In related technologies, LED displays mainly consist of LED modules, power supply boxes, and cabinets. The power supply box supplies power to the LED modules and is connected to the cabinet using screws or pins to secure it to the cabinet.

[0004] However, the connection structure used in related technologies presents a problem of complex operation when disassembling and assembling the power supply box. Summary of the Invention

[0005] This invention provides an LED display screen to solve the problem of complex operation when disassembling and assembling the power supply box in related technologies.

[0006] This invention provides an LED display screen, comprising: a housing; LED modules disposed on the housing; a power supply box detachably disposed on the housing, the power supply box being electrically connected to the LED modules; a connecting lock, including a lever and a locking block, the lever being rotatably disposed on one of the power supply box and the housing, the locking block being rotatably disposed on the other of the power supply box and the housing, the rotation center of the lever coinciding with the rotation center of the locking block, the lever having an unlocked position and a locked position, one end of the lever being provided with an opening groove, the locking block being inserted into the opening groove through the opening groove, so that the lever can drive the locking block to rotate during the switching between the unlocked and locked positions; a limiting member disposed on the power supply box or the housing, when the lever is in the unlocked position, the limiting member avoids at least a portion of the opening groove to allow the locking block to disengage from the opening groove; when the lever is in the locked position, the limiting member stops the locking block to prevent the locking block from disengaging from the opening groove.

[0007] Furthermore, the limiting component includes a first limiting component and a second limiting component, which are respectively disposed on both sides of the rotation center of the lock block. When the lever is in the locked position, the lock block is located in the space enclosed by the opening slot and the first limiting component. The second limiting component stops the lever in the rotation direction from the unlocked position to the locked position.

[0008] Furthermore, the first limiting member has a first arc-shaped surface on the side facing the locking block, and the outer peripheral wall of the locking block has a second arc-shaped surface. The curvature center of the first arc-shaped surface coincides with the curvature center of the second arc-shaped surface. When the lever is in the locked position, the first arc-shaped surface and the second arc-shaped surface abut against each other.

[0009] Furthermore, the outer peripheral wall of the lever has a third arc-shaped surface, and the side of the second limiting member facing the locking block has a fourth arc-shaped surface, wherein the curvature center of the third arc-shaped surface coincides with the curvature center of the fourth arc-shaped surface, and the third arc-shaped surface and the fourth arc-shaped surface abut against each other; and / or, the outer contour of the cross-section of the area jointly enclosed by the second arc-shaped surface and the third arc-shaped surface is circular.

[0010] Furthermore, the lever includes a handle and a plug section connected together, with an opening slot provided in the plug section. The rotation center of the lever corresponds to the plug section. When the lever is in the locked position, the handle abuts against the second limiting member.

[0011] Furthermore, the power supply box includes a box body and a cover plate connected to the box body. The lever is rotatably mounted on the box body, and the cover plate covers the lever. The first limiting member and the second limiting member are both located on the side of the cover plate facing the lever.

[0012] Furthermore, the lever is rotatably mounted on the power supply box, and the locking block is rotatably mounted on the enclosure. When the lever is in the unlocked position, the opening of the slot faces the bottom wall of the enclosure; when the lever is in the locked position, the opening of the slot faces the side wall of the enclosure.

[0013] Furthermore, the opening groove includes a flared groove, and the locking block includes an enlarged diameter section, which is inserted into the flared groove, and the side walls on both sides of the enlarged diameter section are in contact with the groove walls on both sides of the flared groove.

[0014] Furthermore, one of the power supply box and the enclosure is provided with an arc-shaped groove, and the side of the lever is provided with a first boss. The first boss is inserted into the arc-shaped groove and can slide along the extension direction of the arc-shaped groove. The locking block is hinged to the other power supply box and the enclosure. Alternatively, the side of the locking block is provided with a second boss. The second boss is inserted into the arc-shaped groove and can slide along the extension direction of the arc-shaped groove. The lever is hinged to the other power supply box and the enclosure.

[0015] Furthermore, the first or second boss is provided with a spherical groove, and both ends of the arc groove are provided with spherical protrusions. When the lever is in the unlocked or locked position, the spherical protrusions are engaged in the spherical groove.

[0016] Furthermore, the enclosure includes multiple side panels connected in sequence, which together form an accommodating space. The power supply box is located within the accommodating space. A locking block is rotatably mounted on the inner side wall of the side panel, and a lever is rotatably mounted on the side wall of the power supply box.

[0017] According to the technical solution of this invention, the LED display screen includes a cabinet, LED modules, a power supply box, a connecting lock, and a limiting component. When installing the power supply box, it is placed on the cabinet, and the locking block is inserted into the slot through the opening, preventing it from dislodging through the side of the slot. The lever is rotated from the unlocked position to the locked position. During this process, since the locking block is inserted into the slot, the rotation of the lever drives the locking block to rotate. When the lever is rotated to the locked position, the limiting component stops the locking block, preventing it from dislodging from the slot. The lever and the locking block are essentially fixed relative to each other, thus connecting the power supply box and the cabinet. When it is necessary to disassemble the power supply box, simply rotate the lever in the opposite direction, from the locked position to the unlocked position. At this time, the limiting component avoids at least a portion of the slot, and the locking block dislodging through that portion of the slot separates from the lever, thus achieving the disassembly of the power supply box. Because of the combination of the lever, locking block and limiting component, the power box and the enclosure can be disassembled and assembled simply by rotating the lever, which is much simpler to operate compared to the connection structure in the prior art. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 This diagram illustrates the structure of an LED display screen with its lever in the unlocked position according to an embodiment of the present invention.

[0020] Figure 2 It shows Figure 1 Sectional view at point AA;

[0021] Figure 3 This diagram illustrates the structure of the LED display screen provided in an embodiment of the present invention, where the lever is in the locked position.

[0022] Figure 4 It shows Figure 3 Sectional view at BB in the middle;

[0023] Figure 5 It shows Figure 4 A schematic diagram of the lever structure in the diagram;

[0024] Figure 6 A schematic diagram of the structure of the LED display screen housing provided in an embodiment of the present invention is shown;

[0025] Figure 7 A side view of the housing of the LED display screen provided in an embodiment of the present invention is shown;

[0026] Figure 8A schematic diagram of the structure of the cover plate of the LED display screen provided in an embodiment of the present invention is shown;

[0027] Figure 9 A side view of the power supply box of an LED display screen provided in an embodiment of the present invention is shown.

[0028] The above figures include the following reference numerals:

[0029] 10. Box body;

[0030] 20. Power supply box; 21. Box body; 22. Cover plate;

[0031] 30. Connecting lock; 31. Lever; 311. Opening slot; 312. Third arc-shaped surface; 313. Handle; 314. Insertion section; 315. First boss; 316. Spherical groove; 32. Lock block; 321. Second arc-shaped surface;

[0032] 40. Limiting component; 41. First limiting component; 411. First limiting rib; 412. First arc-shaped surface; 42. Second limiting component; 421. Second limiting rib; 422. Fourth arc-shaped surface;

[0033] 50. Arc-shaped groove; 51. Spherical protrusion. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figures 1 to 9As shown, this embodiment of the invention provides an LED display screen, which includes a housing 10, LED modules, a power supply box 20, a connecting lock 30, and a limiting member 40. The LED modules are mounted on the housing 10, and the power supply box 20 is detachably mounted on the housing 10. The power supply box 20 is electrically connected to the LED modules. The connecting lock 30 includes a lever 31 and a locking block 32. The lever 31 is rotatably mounted on one of the power supply box 20 and the housing 10, and the locking block 32 is rotatably mounted on the other. The rotation center of the lever 31 coincides with the rotation center of the locking block 32. The lever 31 has an unlocked position and a locked position. One end of the lever 31 is provided with an opening slot 311, and the locking block 32 passes through... The lever 31 is inserted into the slot 311 so that the lever 31 can drive the locking block 32 to rotate during the switching between the unlocked and locked positions; the limiting member 40 is provided on the power box 20 or the housing 10. When the lever 31 is in the unlocked position, the limiting member 40 avoids at least part of the slot 311 so as to allow the locking block 32 to come out of the slot 311; when the lever 31 is in the locked position, the limiting member 40 stops the locking block 32 to prevent the locking block 32 from coming out of the slot 311.

[0036] According to the technical solution of this invention, the LED display screen includes a housing 10, an LED module, a power supply box 20, a connecting lock 30, and a limiting member 40. When installing the power supply box 20, it is placed on the housing 10, and the locking block 32 is inserted into the opening slot 311 through the slot, preventing the locking block 32 from dislodging through the side of the opening slot 311. The lever 31 is rotated from the unlocked position to the locked position. During this process, since the locking block 32 is inserted into the opening slot 311, the rotation of the lever 31 drives the locking block 32 to rotate. When the lever 31 rotates to the locked position, the limiting member 40 stops the locking block 32, preventing it from dislodging from the opening slot 311. The lever 31 and the locking block 32 are essentially fixed relative to each other, thereby connecting the power supply box 20 and the housing 10. When it is necessary to disassemble the power supply box 20, simply rotate the lever 31 in the reverse direction, moving it from the locked position to the unlocked position. At this time, the limiting member 40 avoids at least a portion of the opening slot 311, and the locking block 32 disengages through that portion of the opening slot 311, separating the locking block 32 from the lever 31. This allows for the disassembly of the power supply box 20. Because of the cooperative arrangement of the lever 31, locking block 32, and limiting member 40, the power supply box 20 and the housing 10 can be assembled and disassembled simply by rotating the lever 31, making the operation much simpler compared to existing connection structures.

[0037] It should be noted that the locking block 32 of the limiting member 40 disengages from the opening groove 311. This can be achieved by the limiting member 40 being a limiting rib, which is located on the power box 20 or the housing 10. When the lever 31 is in the locked position, the locking block 32 is located within the space enclosed by the limiting rib and the opening groove 311. Alternatively, the limiting member 40 can be a mounting groove on the housing 10, with the power box embedded in the mounting groove, allowing the locking block 32 to disengage from the groove wall of the mounting groove 311.

[0038] The lever 31 has an unlocked position and a locked position. Either the opening groove 311 of the lever 31 faces the bottom wall of the enclosure (unlocked position) or the opening groove 311 faces the side wall of the enclosure (locked position), in which case the power supply box 20 is disengaged vertically. Alternatively, the opening groove 311 of the lever 31 can be positioned with the opening groove 311 facing the side wall of the enclosure (unlocked position) or the opening groove 311 facing the bottom wall of the enclosure (locked position), in which case the power supply box 20 is disengaged horizontally.

[0039] It should be noted that the LED module is located on the side of the housing 10 away from the power supply box 20.

[0040] like Figure 2 , Figure 4 as well as Figure 5 As shown, the limiting member 40 includes a first limiting member 41 and a second limiting member 42. The first limiting member 41 and the second limiting member 42 are respectively disposed on both sides of the rotation center of the locking block 32. When the lever 31 is in the locked position, the locking block 32 is located within the space enclosed by the opening groove 311 and the first limiting member 41. The second limiting member 42 stops the lever 31 in the rotation direction from the unlocked position to the locked position. By using the first limiting member 41, when the lever 31 is in the locked position, the locking block 32 can be clamped between the lever 31 and the first limiting member 41, thereby preventing the locking block 32 from coming out of the opening groove 311. By using the second limiting member 42, the lever 31 can be stopped rotating when it reaches the locked position, thereby preventing the first limiting member 41 from failing to stop the locking block 32 due to excessive rotation angle of the lever 31, thus ensuring the locking effect.

[0041] In this embodiment, when the lever 31 is rotated to the unlock position, the first limiting member 41 can stop the lever 31, thereby preventing the second limiting member 42 from blocking the opening of the slot 311 due to the excessive rotation angle of the lever 31, which would prevent the locking block 32 from smoothly disengaging from the opening of the slot 311.

[0042] In this embodiment, the first limiting member 41 includes a first limiting rib 411 disposed on the power supply box 20, and the second limiting member 42 includes a second limiting rib 421 disposed on the power supply box 20. The structure employing the first limiting rib 411 and the second limiting rib 421 has the advantages of simple structure and ease of processing.

[0043] In this embodiment, the upper gap between the first limiting rib 411 and the second limiting rib 421 forms the rotation space of the lever 31, and the lower gap between the first limiting rib 411 and the second limiting rib 421 can avoid the locking block 32, so that the locking block 32 can be inserted into the opening slot 311.

[0044] It should be noted that when both the first limiting rib 411 and the second limiting rib 421 are provided on the housing 10, the first limiting rib 411 can be provided below the locking block 32, so that when the lever 31 is in the locked position, the opening of the slot 311 faces the bottom wall of the housing 10.

[0045] like Figure 4 , Figure 6 as well as Figure 8 As shown, the first limiting member 41 has a first arc-shaped surface 412 on the side facing the locking block 32. The outer peripheral wall of the locking block 32 has a second arc-shaped surface 321 corresponding to the first arc-shaped surface 412. The center of curvature of the first arc-shaped surface 412 coincides with the center of curvature of the second arc-shaped surface 321. When the lever 31 is in the locked position, the first arc-shaped surface 412 and the second arc-shaped surface 321 abut against each other. The cooperation of the first arc-shaped surface 412 and the second arc-shaped surface 321 can not only form a guiding function, allowing the locking block 32 to rotate along the extension direction of the first arc-shaped surface 412, but also form a limiting function, ensuring that the locking block 32 remains in the opening groove 311 during rotation.

[0046] In this embodiment, the arc length of the cross-section of the first arc surface 412 is greater than the arc length of the cross-section of the second arc surface 321, so that the first arc surface 412 can wrap around the second arc surface 321, further preventing the locking block 32 from coming out of the opening slot 311.

[0047] like Figure 2 , Figure 4 , Figure 5 as well as Figure 8As shown, the outer peripheral wall of the lever 31 has a third arc-shaped surface 312, and the side of the second limiting member 42 facing the locking block 32 has a fourth arc-shaped surface 422. The curvature centers of the third arc-shaped surface 312 and the fourth arc-shaped surface 422 coincide, and the third and fourth arc-shaped surfaces 312 abut against each other. The outer contour of the cross-section of the area enclosed by the second and third arc-shaped surfaces 321 and 312 is circular. With this structure, the fourth arc-shaped surface 422 can guide the third arc-shaped surface 312, making the rotation of the lever 31 smoother. Furthermore, the fourth arc-shaped surface 422 also has a certain limiting function. Preferably, during the rotation of the lever 31, the third arc-shaped surface 312 and the fourth arc-shaped surface 422 remain in contact.

[0048] In this embodiment, the outer contour of the cross-section of the area jointly enclosed by the second arc surface 321 and the third arc surface 312 is circular. Furthermore, the cross-sections of the first arc surface 412 and the fourth arc surface 422 are different arc segments of the same circle, and the centers of the four arc surfaces are the same. By adopting the above structure, the first arc surface 412 and the fourth arc surface 422 can both guide the rotation process of the lever 31 and the locking block 32.

[0049] like Figure 4 and Figure 5 As shown, the lever 31 includes a handle 313 and a connecting section 314 connected together. An opening slot 311 is provided in the connecting section 314, and the rotation center of the lever 31 corresponds to the connecting section 314. When the lever 31 is in the locked position, the handle 313 abuts against the second limiting member 42. The handle 313 facilitates operation, and the handle 313 can form a limiting engagement with the second limiting member 42, thereby preventing the lever 31 from rotating too much.

[0050] In this embodiment, the upper end of the first arc-shaped surface 412 is connected to a plane, and the side of the handle 313 is also a plane. The plane at the upper end of the first arc-shaped surface 412 and the side of the handle 313 cooperate to form a limit. When the lever 31 is rotated to the unlock position, it can prevent the rotation angle of the lever 31 from being too large.

[0051] Among them, such as Figure 2 As shown, when the lever 31 is in the unlocked position, the plane of the first limiting member 41 can block the plug section 314 in the vertical direction. At this time, when it is necessary to remove the power box 20 from the housing 10, both the first limiting member 41 and the lever 31 need to be set on the power box 20.

[0052] like Figure 5 as well as Figures 7 to 9As shown, the power supply box 20 includes a box body 21 and a cover plate 22 connected to the box body 21. A lever 31 is rotatably mounted on the box body 21, and the cover plate 22 covers the lever 31. A first limiting member 41 and a second limiting member 42 are both located on the side of the cover plate 22 facing the lever 31. The cover plate 22 can press the lever 31 tightly onto the power supply box 20, and the first limiting member 41 and the second limiting member 42 are also located on the cover plate 22, which has the advantage of being easy to manufacture.

[0053] In this embodiment, a clearance groove is provided on the side wall of the power supply box 20, which forms a cover plate mounting position. After the cover plate 22 is installed in the clearance groove of the power supply box 20, the outer side wall of the cover plate 22 is flush with the side wall of the power supply box 20, thereby enhancing the integrity of the LED display screen.

[0054] Of course, in other embodiments, the cover plate 22 can also limit the power box 20. When the lever 31 is in the locked position, it prevents the locking block 32 from coming out of the opening slot 311 along the extension direction of the power box 20 due to the excessive side gap between the power box 20 and the housing 10.

[0055] In this embodiment, the lever 31 is rotatably mounted on the power supply box 20, and the locking block 32 is rotatably mounted on the housing 10. When the lever 31 is in the unlocked position, the opening of the slot 311 faces the bottom wall of the housing 10; when the lever 31 is in the locked position, the opening of the slot 311 faces the side wall of the housing 10. This structure facilitates the installation of the lever 31 and the locking block 32, and also facilitates the disengagement of the locking block 32 from the slot 311. It has the advantages of simple structure and ease of implementation.

[0056] Specifically, the opening groove 311 includes a flared groove, and the locking block 32 includes an enlarged diameter section inserted into the flared groove. The side walls on both sides of the enlarged diameter section are in contact with the groove walls on both sides of the flared groove. With the above structure, the lever 31 can drive the locking block 32 to rotate synchronously, and the mutual contact between the enlarged diameter section and the flared section prevents relative sliding between them. Furthermore, the flared groove allows the locking block 32 to easily disengage from the opening groove 311.

[0057] In this embodiment, the opening slot 311 includes a connected clearance slot and a flared slot, and the locking block 32 includes a connected arc segment and a flared diameter segment. The opening of the opening slot 311 is the opening of the flared slot. The arc segment is inserted into the clearance slot, and the flared diameter segment is inserted into the flared slot. The shape of the arc segment matches the shape of the clearance slot, and the shape of the flared segment matches the shape of the flared slot. This ensures that when the lever 31 drives the locking block 32 to rotate, the locking block 32 will not slide relative to the other side within the opening slot 311.

[0058] like Figure 5 and Figure 7As shown, one of the power supply box 20 and the housing 10 is provided with an arc-shaped groove 50. The side of the lever 31 is provided with a first protrusion 315. The first protrusion 315 is inserted into the arc-shaped groove 50 and can slide along the extension direction of the arc-shaped groove 50. The locking block 32 is hinged to the other of the power supply box 20 and the housing 10. The arc-shaped groove 50 can guide the lever 31, allowing the lever 31 to slide along the extension direction of the arc-shaped groove 50, thereby making the assembly and disassembly of the power supply box 20 and the housing 10 smoother.

[0059] In this embodiment, the rotation center of the lever 31 is the hinge point between the locking block 32 and the power box 20, and the arc-shaped groove 50 is provided on the side wall of the box 21, with the center of the arc-shaped groove 50 coinciding with the rotation center of the lever 31.

[0060] It should be noted that the cover plate 22 can limit the position of the lever 31, so that the first protrusion 315 of the lever 31 is inserted into the arc groove 50 and cannot be dislodged from the arc groove 50.

[0061] In other embodiments, a second protrusion is provided on the side of the locking block 32. The second protrusion is inserted into the arc groove 50 and can slide along the extension direction of the arc groove 50. The lever 31 is hinged to the other side of the power box 20 and the housing 10.

[0062] like Figure 5 and Figure 7 As shown, the first boss 315 or the second boss is provided with a spherical groove 316, and both ends of the arc-shaped groove 50 are provided with spherical protrusions 51. When the lever 31 is in the unlocked or locked position, the spherical protrusions 51 are engaged in the spherical groove 316. By utilizing the cooperation between the spherical protrusions 51 and the spherical groove 316, the lever 31 can be prevented from rotating easily when it is in the unlocked or locked position due to the limiting cooperation between the spherical protrusions 51 and the spherical groove 316, thus preventing accidental contact or other unexpected situations.

[0063] In this embodiment, the housing 10 includes multiple side plates connected in sequence, which together form an accommodating space. The power supply box 20 is located within the accommodating space. The locking block 32 is rotatably mounted on the inner side wall of the side plate, and the lever 31 is rotatably mounted on the side wall of the power supply box 20. This structure offers the advantages of easy processing and assembly.

[0064] Furthermore, the connection lock 30 provided by this invention has the advantage of low cost because it includes fewer components, thus achieving the locking of the power supply box 20 and the housing 10.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An LED display screen, characterized in that, The LED display screen includes: Box (10); LED modules are mounted on the housing (10); A power supply box (20) is detachably mounted on the housing (10). The power supply box (20) is electrically connected to the LED module. The LED module is located on the side of the housing (10) away from the power supply box (20). A connecting lock (30) includes a lever (31) and a locking block (32). The lever (31) is rotatably disposed in one of the power supply box (20) and the housing (10), and the locking block (32) is rotatably disposed in the other of the power supply box (20) and the housing (10). The rotation center of the lever (31) coincides with the rotation center of the locking block (32). The lever (31) has an unlock position and a locking position. One end of the lever (31) is provided with an opening groove (311). The locking block (32) is inserted into the opening groove (311) through the opening of the opening groove (311) so that the lever (31) can drive the locking block (32) to rotate during the switching process between the unlock position and the locking position. A limiting member (40) is provided on the power box (20) or the housing (10). When the lever (31) is in the unlocked position, the limiting member (40) avoids at least a portion of the opening of the slot (311) to allow the locking block (32) to disengage from the opening of the slot (311); when the lever (31) is in the locked position, the limiting member (40) stops the locking block (32) to prevent the locking block (32) from disengaging from the opening of the slot (311). The limiting member (40) includes a first limiting member (41) and a second limiting member (42). The first limiting member (41) and the second limiting member (42) are respectively disposed on both sides of the rotation center of the locking block (32). When the lever (31) is in the locked position, the locking block (32) is located in the space enclosed by the opening groove (311) and the first limiting member (41). The second limiting member (42) stops the lever (31) in the rotation direction from the unlocked position to the locked position.

2. The LED display screen according to claim 1, characterized in that, The first limiting member (41) has a first arc-shaped surface (412) on the side facing the locking block (32), and the outer peripheral wall of the locking block (32) has a second arc-shaped surface (321). The curvature center of the first arc-shaped surface (412) coincides with the curvature center of the second arc-shaped surface (321). When the lever (31) is in the locked position, the first arc-shaped surface (412) and the second arc-shaped surface (321) abut against each other.

3. The LED display screen according to claim 2, characterized in that, The outer peripheral wall of the lever (31) has a third arc-shaped surface (312), and the side of the second limiting member (42) facing the locking block (32) has a fourth arc-shaped surface (422). The center of curvature of the third arcuate surface (312) coincides with the center of curvature of the fourth arcuate surface (422), and the third arcuate surface (312) and the fourth arcuate surface (422) abut against each other; and / or, The outer contour of the cross-section of the area enclosed by the second arcuate surface (321) and the third arcuate surface (312) is circular.

4. The LED display screen according to claim 1, characterized in that, The lever (31) includes a handle (313) and a plug section (314) connected together. The opening slot (311) is provided on the plug section (314). The rotation center of the lever (31) corresponds to the plug section (314). The second limiting member (42) is located below the rotation center. When the lever (31) is in the locked position, the handle (313) abuts against the second limiting member (42).

5. The LED display screen according to claim 1, characterized in that, The power box (20) includes a box body (21) and a cover plate (22) connected to the box body (21). The lever (31) is rotatably disposed on the box body (21). The cover plate (22) covers the lever (31). The first limiting member (41) and the second limiting member (42) are both disposed on the side of the cover plate (22) facing the lever (31).

6. The LED display screen according to claim 1, characterized in that, The lever (31) is rotatably mounted on the power box (20), and the locking block (32) is rotatably mounted on the housing (10). When the lever (31) is in the unlocked position, the opening of the slot (311) faces the bottom wall of the housing (10); when the lever (31) is in the locked position, the opening of the slot (311) faces the side wall of the housing (10).

7. The LED display screen according to any one of claims 1 to 6, characterized in that, The opening groove (311) includes a flared groove, and the locking block (32) includes an enlarged diameter section. The enlarged diameter section is inserted into the flared groove, and the side walls on both sides of the enlarged diameter section are in contact with the groove walls on both sides of the flared groove.

8. The LED display screen according to any one of claims 1 to 6, characterized in that, One of the power supply box (20) and the housing (10) is provided with an arc-shaped groove (50). The lever (31) has a first protrusion (315) on its side. The first protrusion (315) is inserted into the arc-shaped groove (50) and can slide along the extension direction of the arc-shaped groove (50). The locking block (32) is hinged to the power box (20) and the other part of the housing (10); or, The side of the locking block (32) is provided with a second protrusion, which is inserted into the arc groove (50) and can slide along the extension direction of the arc groove (50). The lever (31) is hinged to the other side of the power box (20) and the housing (10).

9. The LED display screen according to claim 8, characterized in that, The first boss (315) or the second boss is provided with a spherical groove (316), and both ends of the arc groove (50) are provided with spherical protrusions (51). When the lever (31) is in the unlocked position or the locked position, the spherical protrusions (51) are engaged in the spherical groove (316).

10. The LED display screen according to any one of claims 1 to 6, characterized in that, The enclosure (10) includes multiple side panels connected in sequence, which together form an accommodating space. The power supply box (20) is located within the accommodating space. The locking block (32) is rotatably mounted on the inner side wall of the side panel, and the lever (31) is rotatably mounted on the side wall of the power supply box (20).

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