Magnetic type LED display screen unit plate anti-loosening device

Abstract

The utility model relates to the technical field of LED display screens, in particular to a magnetic type LED display screen unit plate anti-loosening device which comprises a display screen frame, the display screen frame comprises a back plate, transverse side plates are arranged at the top and the bottom of the front side of the back plate, vertical side plates are arranged on the left side and the right side of the front side of the back plate, and an inner fixing frame is arranged between the two vertical side plates. A plurality of first butt-joint pieces are arranged on the inner fixing frame, each first butt-joint piece comprises a rectangular hollow fixing block, a rectangular operation opening is formed in the top of each rectangular hollow fixing block, a second butt-joint piece is connected to each first butt-joint piece, each second butt-joint piece comprises a mounting base, and an LED display screen unit plate is arranged on the front side of each mounting base. According to the magnetic type LED display screen unit plate anti-loosening device, through cooperation of the rectangular hollow fixing blocks, the springs, the balls and the rectangular positioning blocks, the LED display screen unit plate is effectively prevented from loosening when subjected to external force or vibration, the anti-loosening function under the external force is considered in the design, and the risk that the LED display screen unit plate accidentally falls off is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of LED display screens, in particular to a magnetic LED display screen unit board anti-loosening device. Background Art

[0002] Magnetic LED displays utilize magnetic mounting technology and are widely used in advertising, stage backdrops, and surveillance displays. Their primary structure consists of multiple LED display panels, which are magnetically attached to the display frame. This installation method offers the advantages of simplicity, speed, and ease of maintenance. However, in actual use, existing magnetic LED display panels are prone to loosening due to external forces, vibration, or environmental changes. This not only affects the display quality but also poses a safety hazard.

[0003] The patent with publication number CN217361053U discloses a magnetic anti-detachment mechanism for an LED display screen, including a fixed shell and a screen assembly, a heat dissipation net is provided at the bottom of the fixed shell, a screen assembly is provided inside the fixed shell, a screen body is provided at the upper end of the screen assembly and located at the upper end of the fixed shell, the fixed shell includes a frame, a limiter, a groove, a back plate, a magnetic plate and a fixing bolt, a back plate is provided at the rear end of the frame, a magnetic plate is provided in the middle of the back plate, four fixing bolts are provided on the periphery of the magnetic plate and located on the back plate, the back plate is fixedly connected to the frame by four fixing bolts, a groove is provided at the lower end of the frame, a limiter is provided above the groove and on the inner side wall of the frame, through such a structural arrangement, the problem of weak magnetic adsorption and easy detachment in the original device can be effectively solved while enhancing the protection of the screen by the fixed shell.

[0004] The above-mentioned existing technology can only magnetically fix a single screen body to prevent it from falling off, and the limit piece is located on the inner wall of the frame. The method of using two limit pieces to limit and fix the fixing seat has the problem of being unable to be disassembled and assembled, which causes the magnetic plate and the back plate to lose their structural function. Since the position of the fixing seat is fixed by the two limit pieces, the screen body cannot be disassembled from the front after installation, which causes technical defects. In view of this, we propose a magnetic LED display unit board anti-loosening device. Utility Model Content

[0005] The purpose of the utility model is to provide a magnetic LED display screen unit board anti-loosening device to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A magnetic LED display unit board anti-loosening device includes a display frame that supports and fixes the entire display structure. The display frame includes a back panel that provides a mounting base and connects the horizontal side panels and the vertical side panels. The top and bottom of the front side of the back panel are both provided with horizontal side panels, and the left and right sides of the front side of the back panel are both provided with vertical side panels. The horizontal side panels and the vertical side panels cooperate to form the frame structure of the display. An internal fixing frame is provided between the two vertical side panels to support and fix the first docking piece. The internal fixing frame includes a plurality of strip-shaped horizontal panels that are equidistantly arranged vertically. The front side of the strip-shaped horizontal panel is provided with a plurality of first docking pieces that are equidistantly arranged horizontally for connecting to the second docking piece.

[0008] The first docking member includes a rectangular hollow solid block fixedly connected to the front side of the strip horizontal plate, the top of the rectangular hollow solid block is provided with a rectangular operating opening, allowing the rectangular positioning block to be inserted, the top of the front side of the rectangular hollow solid block is provided with a U-shaped opening connected to the rectangular operating opening, for the rectangular connecting rod to pass through, the top of the rectangular hollow solid block and near the rear side is provided with a circular shell, the top end of the inner wall of the circular shell is fixedly connected with a spring, the bottom end of the spring is provided with a ball, under the action of the spring, the ball can be stuck in the positioning groove and has a certain resistance to improve stability and play an anti-slip effect, the left and right sides of the rectangular hollow solid block and near the front side are provided with side wings, and the front sides of the two side wings are embedded with magnets;

[0009] The first docking member is connected to a second docking member connected to the first docking member to support the LED display unit board. The second docking member includes a mounting seat, a rectangular connecting rod is provided in the middle of the rear side of the mounting seat, and a rectangular positioning block is provided at the rear end of the rectangular connecting rod. The rectangular positioning block passes through the rectangular operating port to the rectangular hollow solid block. A positioning groove is provided on the top of the rectangular positioning block. The bottom end of the ball passes through the top of the rectangular hollow solid block and is clamped in the positioning groove, so that the rectangular positioning block is positioned in the rectangular hollow solid block. When the LED display unit board needs to be disassembled, a suction cup tool is used to adsorb it on the LED display unit board. The surface of the mounting base is moved outward, and the LED display unit board is pulled outward so that the rectangular positioning block is pulled outward, forcing the bottom end of the ball to move out of the positioning groove. This process requires a certain amount of pulling force, which can facilitate disassembly and assembly, and prevent the rectangular positioning block from slipping easily during use, thereby improving the stability of the LED display unit board during use. Iron sheets are provided on the rear side of the mounting base and near the left and right sides. The two iron sheets are respectively connected to two magnets by adsorption, and the iron sheets are adsorbed by the magnets to strengthen the connection. The front side of the mounting base is detachably connected to the LED display unit board by bolts, and the mounting base supports and fixes the LED display unit board.

[0010] Preferably, the rear sides of the opposite sides of the two lateral side panels are provided with a plurality of first mounting plates arranged equidistantly on the left and right sides, and the first mounting plates are detachably connected to the front side of the back panel by bolts, for fixing the lateral side panels to the back panel.

[0011] Preferably, connecting plates are provided at the left and right ends of the opposite sides of the two horizontal side panels, and the connecting plates are detachably connected to the sides of the vertical side panels by bolts, so that the horizontal side panels and the vertical side panels are docked and fixed in position, thereby improving the overall stability of the display screen frame.

[0012] Preferably, the rear sides of the opposite sides of the two vertical side panels are provided with a plurality of second mounting plates arranged equidistantly up and down, and the second mounting plates are detachably connected to the front side of the back panel by bolts, for fixing the vertical side panels to the back panel.

[0013] Preferably, the opposite sides of the two vertical side panels are provided with a plurality of rectangular slots arranged equidistantly up and down, and the ends of the strip horizontal panels are inserted into the rectangular slots. When installing the strip horizontal panels, first install a vertical side panel, and then insert one end of the plurality of strip horizontal panels into the plurality of rectangular slots of the vertical side panels that are fixed in position, and then install another vertical side panel, so that the other ends of the plurality of strip horizontal panels are respectively inserted into the plurality of rectangular slots of the vertical side panels installed later, and finally fix the position of the vertical side panels installed later.

[0014] Preferably, the internal fixing frame also includes a plurality of U-shaped vertical plates arranged equidistantly on the left and right sides, and the upper and lower sides of the U-shaped vertical plates are detachably connected to the opposite sides of the two horizontal side plates by bolts, so that the positions of the U-shaped vertical plates and the horizontal side plates are fixed, further improving the stability of the display screen frame.

[0015] Preferably, a plurality of positioning holes equidistantly arranged vertically are provided on the rear side of the U-shaped vertical plate, and a plurality of positioning protrusions equidistantly arranged horizontally are provided on the front side of the strip horizontal plate. The plurality of positioning protrusions are respectively inserted into the plurality of positioning holes, so that the relative positions of the plurality of U-shaped vertical plates and the plurality of strip horizontal plates are fixed, thereby improving the overall stability of the internal fixation frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The magnetic LED display unit board anti-loosening device effectively prevents the LED display unit board from loosening when subjected to external force or vibration by using a combination of rectangular hollow solid blocks, springs, balls and rectangular positioning blocks, thereby improving the stability of the overall structure. The anti-loosening function under external force is taken into consideration in the design, reducing the risk of accidental falling off of the LED display unit board and improving safety in use.

[0018] 2. The magnetic LED display unit board anti-loosening device further strengthens the connection between the mounting base and the first docking member through the adsorption of magnets and iron sheets, ensuring the stability of the LED display unit board during use.

[0019] 3. The magnetic LED display unit board anti-loosening device allows the components of the display frame to be disassembled, making it easy for staff to assemble quickly. The use of U-shaped vertical plates, strip-shaped horizontal plates and rectangular slots makes the internal fixing frame more stable and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure of the utility model in use state;

[0022] Figure 3 This is one of the partial structural diagrams of the utility model;

[0023] Figure 4 This is a schematic diagram of the assembly structure of the display screen frame in the present invention;

[0024] Figure 5 This is a schematic diagram of the assembly structure of the internal fixing frame and the first docking member in the present utility model;

[0025] Figure 6 This is the second schematic diagram of the partial structure of the utility model;

[0026] Figure 7 This is a schematic structural diagram of the first docking piece in the present utility model;

[0027] Figure 8 This is a schematic structural diagram of the second docking piece in the present utility model;

[0028] In the figure: 1. display screen frame; 10. back panel; 11. horizontal side panel; 110. first mounting plate; 111. connecting plate; 12. vertical side panel; 120. second mounting plate; 121. rectangular slot; 2. internal fixing frame; 20. strip horizontal panel; 200. positioning protrusion; 21. U-shaped vertical panel; 210. positioning hole; 3. first docking piece; 30. rectangular hollow solid block; 300. rectangular operating port; 301. U-shaped port; 31. side wing; 32. magnet; 33. circular shell; 34. spring; 35. ball; 4. second docking piece; 40. mounting seat; 41. iron sheet; 42. rectangular connecting rod; 43. rectangular positioning block; 430. positioning groove; 5. LED display screen unit board. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] See also Figures 1-8 , the utility model provides a technical solution:

[0032] The magnetic LED display unit board anti-loosening device includes a display frame 1, which supports and fixes the entire display structure. The display frame 1 includes a back panel 10, which provides an installation basis and connects the horizontal side panels 11 and the vertical side panels 12. The back panel 10 is provided with a plurality of heat dissipation holes and wire holes for the wires to pass through. The top and bottom of the front side of the back panel 10 are provided with horizontal side panels 11, and the left and right sides of the front side of the back panel 10 are provided with vertical side panels 12. The horizontal side panels 11 and the vertical side panels 12 cooperate to form the frame structure of the display screen. An internal fixing frame 2 is provided between the two vertical side panels 12 to support and fix the first docking member 3. The internal fixing frame 2 includes a plurality of strip-shaped horizontal panels 20 arranged equidistantly up and down. The front side of the strip-shaped horizontal panel 20 is provided with a plurality of first docking members 3 arranged equidistantly left and right for connecting to the second docking member 4.

[0033] The first docking member 3 includes a rectangular hollow solid block 30 fixedly connected to the front side of the strip cross plate 20, and a rectangular operating opening 300 is provided on the top of the rectangular hollow solid block 30 to allow the rectangular positioning block 43 to be inserted, and a U-shaped opening 301 is provided on the top of the front side of the rectangular hollow solid block 30 to communicate with the rectangular operating opening 300 for the rectangular connecting rod 42 to pass through. A circular shell 33 is provided on the top of the rectangular hollow solid block 30 and near the rear side. The top end of the inner wall of the circular shell 33 is fixedly connected to a spring 34, and the bottom end of the spring 34 is provided with a ball 35. Under the action of the spring 34, the ball 35 can be stuck in the positioning groove 430 and has a certain resistance to improve stability and play an anti-slip effect. Side wings 31 are provided on the left and right sides of the rectangular hollow solid block 30 and near the front side, and magnets 32 are embedded on the front sides of the two side wings 31;

[0034] The first docking member 3 is connected to the second docking member 4 connected to the first docking member 3 to support the LED display unit board 5. The second docking member 4 includes a mounting seat 40. A rectangular connecting rod 42 is provided in the middle of the rear side of the mounting seat 40. A rectangular positioning block 43 is provided at the rear end of the rectangular connecting rod 42. The rectangular positioning block 43 passes through the rectangular operating port 300 to the rectangular hollow solid block 30. A positioning groove 430 is provided on the top of the rectangular positioning block 43. The bottom end of the ball 35 passes through the top of the rectangular hollow solid block 30 and is clamped in the positioning groove 430, so that the rectangular positioning block 43 is positioned in the rectangular hollow solid block 30. When the LED display unit board 5 needs to be disassembled, a suction cup tool is used to adsorb it on the LED display unit board 5. , and pull the LED display unit board 5 outward so that the rectangular positioning block 43 is pulled outward, forcing the bottom end of the ball 35 to move out of the positioning groove 430. This process requires a certain amount of pulling force, which can facilitate disassembly and assembly, and prevent the rectangular positioning block 43 from easily slipping off during use, thereby improving the stability of the LED display unit board 5 during use. Iron sheets 41 are provided on the rear side of the mounting base 40 and near the left and right sides. The two iron sheets 41 are respectively adsorbed and connected to the two magnets 32. The iron sheets 41 are adsorbed by the magnets 32 to strengthen the connection. The front side of the mounting base 40 is detachably connected to the LED display unit board 5 by bolts, and the mounting base 40 supports and fixes the LED display unit board 5.

[0035] In this embodiment, the rear sides of the opposite sides of the two lateral side panels 11 are provided with multiple first mounting plates 110 arranged equidistantly on the left and right. The first mounting plates 110 are detachably connected to the front side of the back panel 10 by bolts, and are used to fix the lateral side panels 11 to the back panel 10.

[0036] Specifically, connecting plates 111 are provided at the left and right ends of the opposite sides of the two horizontal side panels 11. The connecting plates 111 are detachably connected to the sides of the vertical side panels 12 by bolts, so that the horizontal side panels 11 and the vertical side panels 12 are docked and fixed in position, thereby improving the overall stability of the display screen frame 1.

[0037] Furthermore, the rear sides of the opposite sides of the two vertical side panels 12 are provided with multiple second mounting plates 120 arranged equidistantly up and down. The second mounting plates 120 are detachably connected to the front side of the back panel 10 by bolts, and are used to fix the vertical side panels 12 to the back panel 10.

[0038] Furthermore, the opposite sides of the two vertical side panels 12 are provided with a plurality of rectangular slots 121 arranged equidistantly up and down, and the ends of the strip horizontal panels 20 are inserted into the rectangular slots 121. When installing the strip horizontal panels 20, first install a vertical side panel 12, and then insert one end of the plurality of strip horizontal panels 20 into the plurality of rectangular slots 121 of the vertical side panels 12 that are fixed in position, and then install another vertical side panel 12, so that the other ends of the plurality of strip horizontal panels 20 are respectively inserted into the plurality of rectangular slots 121 of the vertical side panels 12 installed later, and finally fix the position of the vertical side panels 12 installed later.

[0039] Furthermore, the internal fixing frame 2 also includes a plurality of U-shaped vertical plates 21 arranged equidistantly on the left and right sides. The upper and lower sides of the U-shaped vertical plates 21 are detachably connected to the opposite sides of the two horizontal side plates 11 by bolts, so that the positions of the U-shaped vertical plates 21 and the horizontal side plates 11 are fixed, further improving the stability of the display screen frame 1.

[0040] Furthermore, a plurality of positioning holes 210 equidistantly arranged vertically are provided on the rear side of the U-shaped vertical plate 21, and a plurality of positioning protrusions 200 equidistantly arranged horizontally are provided on the front side of the strip horizontal plate 20. The plurality of positioning protrusions 200 are respectively inserted into the plurality of positioning holes 210, so that the relative positions of the plurality of U-shaped vertical plates 21 and the plurality of strip horizontal plates 20 are fixed, thereby improving the overall stability of the internal fixing frame 2.

[0041] When the magnetic LED display unit board anti-loosening device of this embodiment is used, the display frame 1 and the internal fixing frame 2 are first assembled. Specifically, the staff uses bolts to connect multiple first mounting plates 110 to the front side of the back plate 10, so that the two horizontal side plates 11 are fixed to the back plate 10, and then install the left vertical side plate 12. Use bolts to connect multiple second mounting plates 120 of the left vertical side plate 12 to the front side of the back plate 10, and then respectively insert the left ends of the multiple strip horizontal plates 20 into the multiple rectangular slots 121 of the left vertical side plate 12, and then install the right vertical side plate 12, move the right vertical side plate 12 to the left, so that the right ends of the multiple strip horizontal plates 20 The ends are respectively inserted into the multiple rectangular slots 121 of the right vertical side panel 12, and then the multiple second mounting plates 120 of the right vertical side panel 12 are connected to the front side of the back panel 10 with bolts to form a frame structure. Then, multiple U-shaped vertical panels 21 are installed, so that the positioning holes 210 on the U-shaped vertical panels 21 are docked with the positioning protrusions 200 on the strip horizontal panels 20, and the upper and lower sides of the U-shaped vertical panels 21 are respectively installed on the opposite sides of the two horizontal side panels 11 with bolts. After that, the staff installs the LED display unit board 5 on the mounting seat 40, fixes it with bolts, and then passes the rectangular positioning block 43 from the rectangular operating port 300 into the rectangular hollow solid block 30. At this time, the rectangular connection The rod 42 passes through the U-shaped opening 301, and then pushes the LED display unit board 5 toward the inner fixing frame 2. Under the action of the thrust, the ball 35 is squeezed and moves upward. When the rear side of the rectangular positioning block 43 fits with the rear side of the inner wall of the rectangular hollow solid block 30, the bottom end of the ball 35 is stuck in the positioning groove 430, and the two magnets 32 are respectively adsorbed and connected with the two iron sheets 41, thereby realizing the installation of the LED display unit board 5. Since the bottom end of the ball 35 is stuck in the positioning groove 430, the rectangular positioning block 43 has a certain resistance when moving forward, which can play a role in preventing it from falling off. When the LED display unit board 5 needs to be maintained or replaced, a suction cup tool is used to adsorb it. On the surface of the screen, pull outward to release the clamping of the ball 35 on the rectangular positioning block 43, and then move the rectangular positioning block 43 upward to remove the rectangular positioning block 43 from the rectangular operating port 300, thereby separating the second docking member 4 from the first docking member 3 and completing the disassembly of the LED display unit board 5. This design ensures that a certain pulling force is required during the disassembly process to avoid accidental slippage. The device design takes anti-slip function into consideration, and through the combination of magnetic attraction and mechanical fixation, ensures stability when subjected to external force or vibration, and reduces the risk of falling off. This device has a simple structure and is easy to assemble and disassemble, while providing good anti-loosening effect and stability, making it an ideal choice for maintaining and installing LED displays.

[0042] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic LED display unit board anti-loosening device, comprising a display frame (1), characterized in that: The display screen frame (1) includes a back panel (10), the top and bottom of the front side of the back panel (10) are both provided with horizontal side panels (11), the left and right sides of the front side of the back panel (10) are both provided with vertical side panels (12), an internal fixing frame (2) is provided between the two vertical side panels (12), the internal fixing frame (2) includes a plurality of strip-shaped horizontal panels (20) arranged at equal distances from top to bottom, the front side of the strip-shaped horizontal panels (20) is provided with a plurality of first docking members (3) arranged at equal distances from left to right, the first docking member (3) includes a fixing member A rectangular hollow solid block (30) is fixedly connected to the front side of the strip-shaped horizontal plate (20), the top of the rectangular hollow solid block (30) is provided with a rectangular operating port (300), the top of the front side of the rectangular hollow solid block (30) is provided with a U-shaped port (301) connected to the rectangular operating port (300), the top of the rectangular hollow solid block (30) and the position close to the rear side are provided with a circular shell (33), the top end of the inner wall of the circular shell (33) is fixedly connected with a spring (34), the bottom end of the spring (34) is provided with a ball (33) 5), the rectangular hollow solid block (30) is provided with side wings (31) on both sides and near the front side, and the front sides of the two side wings (31) are embedded with magnets (32), the first docking member (3) is connected to the second docking member (4), the second docking member (4) includes a mounting seat (40), a rectangular connecting rod (42) is provided in the middle of the rear side of the mounting seat (40), and a rectangular positioning block (43) is provided at the rear end of the rectangular connecting rod (42), and the rectangular positioning block (43) passes through the rectangular operating port ( 300) into the rectangular hollow solid block (30), the top of the rectangular positioning block (43) is provided with a positioning groove (430), the bottom end of the ball (35) passes through the top of the rectangular hollow solid block (30) and is clamped in the positioning groove (430), the rear side of the mounting seat (40) and the positions close to the left and right sides are provided with iron sheets (41), the two iron sheets (41) are respectively adsorbed and connected with the two magnets (32), and the front side of the mounting seat (40) is detachably connected with the LED display unit board (5) by bolts.

2. The magnetic LED display unit board anti-loosening device according to claim 1 is characterized in that: A plurality of first mounting plates (110) arranged equidistantly from side to side are provided on the rear sides of the two lateral side plates (11) on opposite sides, and the first mounting plates (110) are detachably connected to the front side of the back plate (10) via bolts.

3. The magnetic LED display unit board anti-loosening device according to claim 1, characterized in that: Connecting plates (111) are provided at both left and right ends of the opposite sides of the two transverse side plates (11), and the connecting plates (111) are detachably connected to the sides of the vertical side plates (12) via bolts.

4. The magnetic LED display unit board anti-loosening device according to claim 1, characterized in that: A plurality of second mounting plates (120) arranged equidistantly up and down are provided on the rear sides of the two vertical side plates (12) on opposite sides, and the second mounting plates (120) are detachably connected to the front side of the back plate (10) via bolts.

5. The magnetic LED display unit board anti-loosening device according to claim 1, characterized in that: The opposite sides of the two vertical side panels (12) are each provided with a plurality of rectangular slots (121) arranged equidistantly up and down, and the ends of the strip-shaped horizontal panels (20) are inserted into the rectangular slots (121).

6. The magnetic LED display unit board anti-loosening device according to claim 1, characterized in that: The internal fixing frame (2) further comprises a plurality of U-shaped vertical plates (21) arranged equidistantly from side to side, wherein the upper and lower sides of the U-shaped vertical plates (21) are detachably connected to the opposite sides of the two transverse side plates (11) via bolts.

7. The magnetic LED display unit board anti-loosening device according to claim 6, characterized in that: The rear side of the U-shaped vertical plate (21) is provided with a plurality of positioning holes (210) arranged equidistantly in the upper and lower directions, and the front side of the strip-shaped horizontal plate (20) is provided with a plurality of positioning protrusions (200) arranged equidistantly in the left and right directions, and the plurality of positioning protrusions (200) are respectively inserted into the plurality of positioning holes (210).

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