Splicing type LED display screen

Abstract

The invention discloses a spliced LED display screen, and belongs to the technical field of display screens. A splicing type LED display screen comprises a plurality of display screen modules which are spliced with one another, each display screen module comprises a screen body and a protective outer frame arranged on the outer side of the screen body, the outer side of each protective outer frame is provided with two sets of positioning assemblies, the two sets of positioning assemblies are arranged on the two sides of the corresponding protective outer frame respectively, and the two sets of positioning assemblies are perpendicularly arranged; the locking module is used for connecting and locking an adjacent display screen module; the flat cable mounting assembly is arranged on the protective outer frame and is connected with the screen main body through a wire; wherein a mounting seat is arranged on the protective outer frame; the display screen module of the LED display screen can be conveniently and rapidly assembled, the problem that an existing display screen module needs to be installed and positioned by screwing screws is solved, and operation is easy and rapid; and when two adjacent display screen modules are spliced, the flat cables of the display screen modules are quickly connected, so that the splicing efficiency of the display screen is further improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a splicing LED display screen. Background Technology

[0002] LED displays are widely used in public places such as advertising, train stations, banks, and shopping malls. They have advantages such as low power consumption, long lifespan, and good color reproduction. Currently, for some large LED displays, square screens are often spliced ​​together for ease of transportation and installation.

[0003] LED displays are fixed to a back frame using fasteners. To ensure the flatness of the LED display surface, adjacent display modules need to be aligned and positioned. Existing connection methods generally use screws for fixing, and the same display module needs to be spliced ​​with different display modules using multiple screws, making assembly and subsequent disassembly and maintenance work cumbersome. At the same time, different display modules generally need to have their respective ribbon cables connected in series, requiring workers to reconnect the ribbon cables after splicing the display modules, thus reducing the assembly efficiency of the display screen. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and to propose a splicing LED display screen.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A splicing LED display screen includes multiple interconnected display modules. Each display module includes a screen body and a protective frame disposed on the outside of the screen body. The outer side of the protective frame is provided with:

[0007] The positioning component is disposed on the protective outer frame and includes a horizontal positioning component for positioning two adjacent display modules in the left-right direction and a vertical positioning component for positioning two adjacent display modules in the up-down direction. The horizontal positioning component and the vertical positioning component have the same structure.

[0008] And a ribbon cable mounting assembly, which is mounted on the protective outer frame and connected to the screen body via a wire;

[0009] The protective outer frame is provided with a mounting base, and the mounting base is provided with a retractable component for releasing the positioning component and the cable mounting component from their locked states.

[0010] Preferably, the positioning component includes a positioning seat fixed on the protective frame, a positioning block movably disposed within the positioning seat, and a first socket disposed on the side of the protective frame away from the positioning seat, wherein the positioning block is inserted into the first socket that movably abuts against it.

[0011] Preferably, the positioning block includes a movable block slidably connected within the positioning seat, a first elastic element disposed between the movable block and the inner wall of the positioning seat, a movable groove formed on the movable block, a locking block slidably connected within the movable groove, and a second elastic element disposed between the locking block and the inner wall of the movable groove. The top of the locking block is provided with a pressing slope, and the first socket is provided with a locking groove that cooperates with the locking block.

[0012] Preferably, the ribbon cable mounting assembly includes a plug portion fixed to one side of the protective frame and a second socket disposed on the side of the protective frame away from the plug portion, wherein the plug portion is inserted into the second socket that moves against it.

[0013] Preferably, the plug portion includes a plug housing and a movable rod slidably connected within the plug housing. A third elastic element is provided between the movable rod and the inner wall of the plug housing. A conductive seat is connected to the top of the movable rod via a fourth elastic element. A power socket electrically connected to the conductive seat is provided inside the second socket.

[0014] Preferably, the retraction assembly includes a mounting base fixed on the protective outer frame, a rotating ring rotatably connected to the mounting base, and a plurality of pull ropes disposed on the rotating ring. The plurality of pull ropes are respectively connected to the locking block of the positioning assembly and the conductive seat of the cable mounting assembly. A torsion spring is disposed between the rotating ring and the mounting base. The pull rope connected to the locking block passes through the moving block and the positioning base, and the pull rope connected to the conductive seat passes through the moving rod.

[0015] Preferably, both the plug housing and the positioning seat are provided with a limiting mechanism with the same structure. The limiting mechanism includes a limiting part and a driving part for driving the limiting part to move. The driving part on the plug housing is disposed in the moving rod, and the driving part on the positioning seat is disposed in the moving block.

[0016] Preferably, the limiting part includes an L-shaped baffle, and a fifth elastic element is provided between the L-shaped baffle on the plug housing and the plug housing, and between the L-shaped baffle on the positioning seat and the positioning seat. The L-shaped baffle on the plug housing is slidably connected to the plug housing and moves against the moving rod. The L-shaped baffle on the positioning seat is slidably connected to the positioning seat and moves against the moving block.

[0017] Preferably, the drive unit includes a rotating rod, a connecting plate movably disposed inside the rotating rod and connected to the pull rope, and a push rod disposed outside the rotating rod and movably abutting against the L-shaped baffle. The rotating rod is provided with a spiral guide groove. The rotating rod inside the plug housing is disposed inside the moving rod, and the rotating rod inside the positioning seat is disposed inside the moving block. Both the moving rod and the moving block are provided with positioning rods that cooperate with the spiral guide groove.

[0018] Preferably, the mounting base has a threaded hole, and a bolt or screw is movably disposed in the threaded hole.

[0019] Compared with the prior art, the present invention provides a splicing LED display screen, which has the following beneficial effects:

[0020] 1. This splicing LED display screen uses positioning components to quickly splice two adjacent display modules, eliminating the traditional method of relying on a large number of screws to fix adjacent modules one by one. This avoids the time-consuming and labor-intensive process of repeatedly tightening screws and solves the problem of manually connecting the ribbon cables one by one after the mechanical splicing is completed. It realizes the simultaneous completion of mechanical splicing and electrical connection, effectively improving the splicing efficiency of the splicing LED display screen.

[0021] 2. This splicing LED display screen greatly simplifies the disassembly and replacement process of a single faulty display module by setting a retractable component. The traditional method requires first removing the surrounding fixing screws and ribbon cable connectors, which is difficult to operate in due to limited space and prone to errors. This application can simultaneously release the mechanical lock, disconnect the electrical connection and retract the protruding parts through "one-click operation" (rotating the rotating ring), making the module easy to remove, reducing the difficulty of replacing the display module and improving the efficiency of replacing the display module.

[0022] 3. This splicing LED display screen, by setting a limiting mechanism in the positioning seat, limits the downward movement of the positioning block that is elastically set in the positioning seat, so as to avoid the positioning block being unable to drive the card block to be effectively inserted into the card slot when the positioning block is inserted into the first socket due to the elastic connection on the lower side, which would affect the insertion effect of the two adjacent display screen modules; and by setting a limiting mechanism in the plug shell, the downward movement of the moving rod can be limited, so that the conductive seat and the fourth elastic element can be tightly abutted against the power receiving seat. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the external structure of the protective frame of the present invention;

[0026] Figure 4 This is a cross-sectional structural diagram of the positioning seat of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged structural diagram of section A in the middle;

[0028] Figure 6 This is a schematic cross-sectional view of the rotating rod of the present invention;

[0029] Figure 7 This is a cross-sectional structural diagram of the plug housing of the present invention.

[0030] In the diagram: 1. Display module; 101. Screen body; 102. Protective frame; 3. Mounting base; 301. Rotating ring; 302. Pull rope; 4. Positioning base; 5. Positioning block; 501. Moving block; 502. First elastic element; 503. Movable groove; 504. Locking block; 505. Second elastic element; 6. First socket; 601. Locking slot; 7. Plug shell; 701. Moving rod; 702. Third elastic element; 703. Fourth elastic element; 704. Conductive base; 8. Second socket; 801. Power connection base; 9. Threaded hole; 10. L-shaped baffle; 1001. Fifth elastic element; 11. Rotating rod; 111. Connecting plate; 112. Push rod; 113. Spiral guide groove; 12. Positioning rod. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, this embodiment proposes a splicing LED display screen, including multiple spliced ​​display screen modules 1. Each display screen module 1 includes a screen body 101 and a protective frame 102 disposed on the outside of the screen body 101. The protective frame 102 is provided with a positioning component and a ribbon cable mounting component. The positioning component is disposed on the protective frame 102 and includes a horizontal positioning component for positioning two adjacent display screen modules 1 in the left-right direction and a vertical positioning component for positioning two adjacent display screen modules 1 in the up-down direction. The horizontal positioning component and the vertical positioning component have the same structure. The ribbon cable mounting component is disposed on the protective frame 102 and is connected to the screen body 101 through a wire. The protective frame 102 is provided with a mounting base 3, and the mounting base 3 is provided with a retraction component for releasing the locking state of the positioning component and the ribbon cable mounting component.

[0035] Furthermore, the positioning component includes a positioning seat 4 fixed on the protective outer frame 102, a positioning block 5 movably disposed within the positioning seat 4, and a first socket 6 disposed on the side of the protective outer frame 102 away from the positioning seat 4, wherein the positioning block 5 is inserted into the first socket 6 which is movably opposed to it.

[0036] Furthermore, the positioning block 5 includes a movable block 501 slidably connected in the positioning seat 4, a first elastic element 502 disposed between the movable block 501 and the inner wall of the positioning seat 4, an active groove 503 opened on the movable block 501, a locking block 504 slidably connected in the active groove 503, and a second elastic element 505 disposed between the locking block 504 and the inner wall of the active groove 503. The top of the locking block 504 is provided with a pressing slope, and the first socket 6 is provided with a locking groove 601 that cooperates with the locking block 504.

[0037] Furthermore, the cable mounting assembly includes a plug portion fixed to one side of the protective frame 102 and a second socket 8 disposed on the side of the protective frame 102 away from the plug portion, with the plug portion inserted into the second socket 8 which moves against it.

[0038] Furthermore, the plug part includes a plug housing 7 and a movable rod 701 slidably connected in the plug housing 7. A third elastic element 702 is provided between the movable rod 701 and the inner wall of the plug housing 7. The top of the movable rod 701 is connected to a conductive seat 704 through a fourth elastic element 703. A power socket 801 electrically connected to the conductive seat 704 is provided in the second socket 8.

[0039] Specifically, each display module 1 is mechanically aligned via horizontal / vertical positioning components on the protective frame 102. The positioning components adopt a symmetrical design. The positioning components include the cooperation of elastic blocks 504 and slots 601, which automatically engage and lock upon insertion. The conductive base 704 of the ribbon cable mounting component is pressed against the electrical base 801 via a fourth elastic element 703, achieving synchronous mechanical and electrical connection. During splicing, the positioning bases 4 and first sockets 6, and plug shells 7 and second sockets 8 of adjacent modules are aligned, so that the blocks 504 are pressed into the slots 601, and the conductive base 704 presses against the electrical base 801 to complete the locking. The horizontal / vertical positioning components have the same structure, reducing operational complexity. The automatic insertion and locking design of the elastic blocks 504 and conductive bases 704 ensures the splicing firmness and electrical signal stability.

[0040] It should be noted that the ribbon cable mounting assembly is generally installed vertically on the protective frame 102, that is, the plug and the second socket 8 are inserted vertically. However, when adjacent display modules 1 located at the top or bottom of the entire splicing display screen are spliced ​​horizontally, the plug and the second socket 8 should be inserted horizontally. This is because the top or bottom display module 1 does not have a plug or the second socket 8 at its top or bottom, and can only be connected to the ribbon cable mounting assembly on its horizontally adjacent display module 1 for conduction. This results in the ribbon cable mounting assembly being arranged in a skewed "S" shape on the back of the splicing display screen.

[0041] By setting up positioning components to quickly splice two adjacent display modules 1, the traditional method of relying on a large number of screws to fix adjacent modules one by one is abandoned, avoiding the time-consuming and labor-intensive process of repeatedly tightening screws. It also solves the problem of manually connecting the ribbon cables one by one after the mechanical splicing is completed, realizing the simultaneous completion of mechanical splicing and electrical connection, and effectively improving the splicing efficiency of splicing display screens.

[0042] like Figure 2 and Figure 3 As shown, in a preferred embodiment, based on the above method, the mounting base 3 is further provided with a threaded hole 9, and a bolt or screw is movably disposed in the threaded hole 9; after the display module 1 is spliced, the mounting base 3 is fixedly installed using bolts or screws, so that the spliced ​​display screen is installed in the required position, such as the back frame or cavity wall.

[0043] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, in a preferred embodiment, based on the above method, the shrinking component further includes a rotating ring 301 rotatably connected to the mounting base 3 and a plurality of pull ropes 302 disposed on the rotating ring 301. The plurality of pull ropes 302 are respectively connected to the locking block 504 of the positioning component and the conductive seat 704 of the cable mounting component. A torsion spring is provided between the rotating ring 301 and the mounting base 3. The pull rope 302 connected to the locking block 504 passes through the moving block 501 and the positioning base 4, and the pull rope 302 connected to the conductive seat 704 passes through the moving rod 701.

[0044] Furthermore, both the plug housing 7 and the positioning seat 4 are provided with a limiting mechanism with the same structure. The limiting mechanism includes a limiting part and a driving part for driving the limiting part to move. The driving part on the plug housing 7 is located in the moving rod 701, and the driving part on the positioning seat 4 is located in the moving block 501.

[0045] Furthermore, the limiting part includes an L-shaped baffle 10. A fifth elastic element 1001 is provided between the L-shaped baffle 10 on the plug housing 7 and between the L-shaped baffle 10 on the positioning seat 4 and the positioning seat 4. The L-shaped baffle 10 on the plug housing 7 is slidably connected to the plug housing 7 and moves against the moving rod 701. The L-shaped baffle 10 on the positioning seat 4 is slidably connected to the positioning seat 4 and moves against the moving block 501.

[0046] Furthermore, the drive unit includes a rotating rod 11, a connecting plate 111 movably disposed inside the rotating rod 11 and connected to the pull rope 302, and a push rod 112 disposed outside the rotating rod 11 and movably abutting against the L-shaped baffle 10. The rotating rod 11 is provided with a spiral guide groove 113. The rotating rod 11 inside the plug housing 7 is disposed inside the moving rod 701, and the rotating rod 11 inside the positioning seat 4 is disposed inside the moving block 501. Both the moving rod 701 and the moving block 501 are provided with positioning rods 12 that cooperate with the spiral guide groove 113.

[0047] Specifically, by setting a limiting mechanism in the positioning seat 4, the L-shaped baffle 10 can limit the downward movement of the positioning block 5 elastically set in the positioning seat 4, so as to prevent the positioning block 5 from being unable to drive the card block 504 to be effectively inserted into the card slot 601 due to the elastic connection on the lower side when the positioning block 5 is inserted into the first socket 6, thus affecting the insertion effect of the two adjacent display modules 1; and by setting a limiting mechanism in the plug housing 7, the L-shaped baffle 10 can limit the downward movement of the moving rod 701, so that the conductive seat 704 and the fourth elastic element 703 can be tightly abutted against the power receiving seat 801.

[0048] Working principle: When adjacent display modules 1 are spliced ​​together, the positioning seat 4 on the protective frame 102 of one module is precisely aligned with the first socket 6 on the adjacent module; at the same time, the plug shell 7 on the protective frame 102 of that module is aligned with the second socket 8 on the adjacent module; when the moving block 501 in the positioning seat 4 is inserted into the first socket 6, the locking block 504 is abutted by the first socket 6 and retracts into the movable groove 503 until the locking block 504 is aligned with the slot 601. Under the elastic force of the second elastic element 505, the locking block 504 is inserted into the slot 601, realizing the splicing and installation of two adjacent display modules 1. During this process, the moving rod 701 of the plug shell 7 is driven by the fourth elastic element 703. The conductive base 704 is inserted into the second socket 8, making the conductive base 704 abut against the power receiving base 801 for conductive contact. Then, the mounting base 3 is fixed in place using bolts or screws, allowing the splicing display screen to be installed in the desired location, such as a back frame or cavity wall. When it is necessary to disassemble or replace a single display module 1, the operator rotates the rotating ring 301, causing the rotating ring 301 to wind up the pull rope 302. The pull rope 302 applies tension to the connected locking block 504 or the conductive base 704. After being pulled by the pull rope 302, the locking block 504 retracts into the movable groove 503, releasing the movement restriction between the positioning block 5 and the first socket 6. As the pull rope 302 continues to be pulled, the pull rope 302 in the positioning block 5 drives the rotating rod 1 through the connecting plate 111. 1. As the rotating rod 11 moves downward, it rotates under the action of the spiral guide groove 113. The rotating rod 11 drives the push rod 112 to rotate and pushes one end of the L-shaped baffle 10, so that the L-shaped baffle 10 at the positioning seat 4 no longer restricts the downward movement of the moving block 501. Then, the pulling force of the pull rope 302 on the locking block 504 is transmitted to the moving block 501. The moving block 501 moves downward in the positioning seat 4 and squeezes the first elastic element 502, so that the moving block 501 will not protrude beyond the height of the protective frame 102. Similarly, the pull rope 302 connected to the conductive seat 704 pulls the conductive seat 704 downward, so that the conductive seat 704 separates from the contact seat 801. When the L-shaped baffle 10 on the outside of the plug shell 7 limits the moving rod 701, the fourth The elastic element 703 is compressed. During this period, as the pull rope 302 inside the plug housing 7 continues to be pulled, the rotating rod 11 inside the moving rod 701 rotates under the action of the spiral guide groove 113 and drives the push rod 112 to push the L-shaped baffle 10 on the outside of the plug housing 7, releasing the movement restriction of the moving rod 701 inside the plug housing 7. As the pull rope 302 inside the plug housing 7 continues to be pulled, the moving rod 701 drives the conductive seat 704 to retract inside the plug housing 7 through the fourth elastic element 703, so that the conductive seat 704 will not protrude beyond the height of the protective frame 102. At this time, the staff only needs to remove the screws or bolts on the mounting base 3 to take out the display module 1 to be replaced from the whole assembled display screen. The operation is simple and quick.

[0049] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A splicing LED display screen, comprising multiple interconnected display screen modules (1), characterized in that, The display module (1) includes a screen body (101) and a protective frame (102) disposed on the outside of the screen body (101). The protective frame (102) is provided with the following on its outer side: The positioning component is disposed on the protective outer frame (102) and includes a horizontal positioning component for positioning two adjacent display modules (1) in the left and right directions and a vertical positioning component for positioning two adjacent display modules (1) in the up and down directions. The horizontal positioning component and the vertical positioning component have the same structure. And a ribbon cable mounting assembly, which is disposed on the protective outer frame (102) and connected to the screen body (101) via a wire; The protective outer frame (102) is provided with a mounting base (3), and the mounting base (3) is provided with a retractable component for releasing the locking state of the positioning component and the cable mounting component.

2. The splicing LED display screen according to claim 1, characterized in that, The positioning component includes a positioning seat (4) fixed on the protective outer frame (102), a positioning block (5) movably disposed in the positioning seat (4), and a first socket (6) disposed on the side of the protective outer frame (102) away from the positioning seat (4), wherein the positioning block (5) is inserted into the first socket (6) which is movably opposed to it.

3. A splicing LED display screen according to claim 2, characterized in that, The positioning block (5) includes a movable block (501) slidably connected in the positioning seat (4), a first elastic element (502) disposed between the movable block (501) and the inner wall of the positioning seat (4), an active groove (503) opened on the movable block (501), a locking block (504) slidably connected in the active groove (503), and a second elastic element (505) disposed between the locking block (504) and the inner wall of the active groove (503). The top of the locking block (504) is provided with a pressing slope, and the first socket (6) is provided with a locking groove (601) that cooperates with the locking block (504).

4. A splicing LED display screen according to claim 3, characterized in that, The cable mounting assembly includes a plug fixed to one side of the protective frame (102) and a second socket (8) disposed on the side of the protective frame (102) away from the plug, wherein the plug is inserted into the second socket (8) which moves against it.

5. A splicing LED display screen according to claim 4, characterized in that, The plug part includes a plug shell (7) and a movable rod (701) slidably connected in the plug shell (7). A third elastic element (702) is provided between the movable rod (701) and the inner wall of the plug shell (7). A conductive seat (704) is connected to the top of the movable rod (701) through a fourth elastic element (703). A power socket (801) electrically connected to the conductive seat (704) is provided in the second socket (8).

6. A splicing LED display screen according to claim 5, characterized in that, The retraction assembly includes a rotating ring (301) rotatably connected to the mounting base (3) and a plurality of pull ropes (302) disposed on the rotating ring (301). The plurality of pull ropes (302) are respectively connected to the locking block (504) of the positioning assembly and the conductive seat (704) of the cable mounting assembly. A torsion spring is provided between the rotating ring (301) and the mounting base (3). The pull rope (302) connected to the locking block (504) passes through the moving block (501) and the positioning base (4), and the pull rope (302) connected to the conductive seat (704) passes through the moving rod (701).

7. A splicing LED display screen according to claim 6, characterized in that, Both the plug housing (7) and the positioning seat (4) are provided with limiting mechanisms of the same structure. The limiting mechanism includes a limiting part and a driving part for driving the limiting part to move. The driving part on the plug housing (7) is located in the moving rod (701), and the driving part on the positioning seat (4) is located in the moving block (501).

8. A splicing LED display screen according to claim 7, characterized in that, The limiting part includes an L-shaped baffle (10). A fifth elastic element (1001) is provided between the L-shaped baffle (10) on the plug shell (7) and between the L-shaped baffle (10) on the positioning seat (4) and the positioning seat (4). The L-shaped baffle (10) on the plug shell (7) is slidably connected to the plug shell (7) and moves against the moving rod (701). The L-shaped baffle (10) on the positioning seat (4) is slidably connected to the positioning seat (4) and moves against the moving block (501).

9. A splicing LED display screen according to claim 8, characterized in that, The drive unit includes a rotating rod (11), a connecting plate (111) movably disposed inside the rotating rod (11) and connected to the pull rope (302), and a push rod (112) disposed outside the rotating rod (11) and movably abutting against the L-shaped baffle (10). The rotating rod (11) is provided with a spiral guide groove (113). The rotating rod (11) inside the plug housing (7) is disposed inside the moving rod (701), and the rotating rod (11) inside the positioning seat (4) is disposed inside the moving block (501). The moving rod (701) and the moving block (501) are both provided with positioning rods (12) that cooperate with the spiral guide groove (113).

10. A splicing LED display screen according to claim 9, characterized in that, The mounting base (3) has a threaded hole (9), and a bolt or screw is movably installed in the threaded hole (9).

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