Connecting mechanism, back frame and LED display device

Abstract

The utility model discloses a connecting mechanism, a back frame and an LED display device, and relates to the technical field of LED display devices.The connecting mechanism comprises a vertical rod, a shaft sleeve, a transverse rod, a sliding pin and a driving assembly, the vertical rod is sleeved with the shaft sleeve, the transverse rod is fixed to the shaft sleeve, the transverse rod is used for being connected with the LED display device, and the sliding pin is slidably arranged in the shaft sleeve; the sliding pin is configured to slide between a first position and a second position, the sliding pin limits movement of the cross rod and the shaft sleeve relative to the vertical rod when the sliding pin is located at the first position, limitation on movement of the cross rod and the shaft sleeve is relieved when the sliding pin is located at the second position, and the driving assembly is movably arranged on the cross rod, connected with the sliding pin and used for driving the sliding pin to slide. According to the connecting mechanism, the problem that quick disassembly and assembly and safe and reliable connection cannot be met at the same time when a cross rod and a vertical rod are connected at present is solved.

Description

Technical Field

[0001] This application relates to the field of LED display device technology, and in particular to a connection mechanism, a back frame, and an LED display device. Background Technology

[0002] Currently, LED display devices are widely used in indoor, outdoor, stage, and advertising fields.

[0003] In related technologies, LED display devices often utilize back frame structures to enhance overall stability and ease of assembly and disassembly. Currently, the connection between horizontal and vertical bars in these back frame structures typically employs screws or pipe clamps for fixation. Screw fixation cannot achieve rapid installation, failing to meet the demands of quick LED display device assembly. While pipe clamps allow for quick installation, their connection relies on friction; when the clamping friction is less than the external force, there is a risk of connection failure, making the pipe clamp fixation method unreliable. Utility Model Content

[0004] The purpose of this application is to provide a connecting mechanism, a back frame, and an LED display device, which solves the problem that current methods of connecting horizontal and vertical bars cannot simultaneously satisfy both quick assembly / disassembly and safe and reliable connection.

[0005] To achieve the above objectives, this application provides a connection mechanism, comprising:

[0006] Vertical pole;

[0007] A bushing, fitted onto the vertical rod;

[0008] A crossbar, fixed to a bushing, is used to connect LED display devices;

[0009] A sliding pin is slidably disposed in the bushing. The sliding pin is configured to slide between a first position and a second position. When the sliding pin is in the first position, it restricts the movement of the crossbar and the bushing relative to the vertical bar. When the sliding pin is in the second position, it releases the restriction on the movement of the crossbar and the bushing.

[0010] A drive assembly is movably mounted on the crossbar and connected to a sliding pin to drive the sliding pin to slide.

[0011] In some embodiments, the sliding pin is provided with a groove, the groove having a first inner wall and a second inner wall;

[0012] The drive assembly includes a camshaft, which includes a shaft body and a cam body disposed on the shaft body. The camshaft is rotatably disposed in a groove. The cam body is configured to engage with a first inner wall when the shaft body rotates in a first direction to move a sliding pin to a first position, and to engage with a second inner wall when the shaft body rotates in a second direction to move the sliding pin to a second position.

[0013] In some embodiments, a first locking position is provided on the first inner wall, and a second locking position is provided on the second inner wall. The first locking position, the second locking position and the axis of the shaft are set at the same height. The sliding pin is used to reach the first position after the cam body rotates in the first direction to pass the first locking position, and to reach the second position after the cam body rotates in the second direction to pass the second locking position.

[0014] In some embodiments, the shaft body is provided with a limiting groove along the circumferential direction, and a bushing is connected to a limiting member. The limiting member extends into the limiting groove, so that the rotation angle of the shaft body is limited within a preset range.

[0015] In some embodiments, one end of the shaft is provided with an anti-rotation protrusion;

[0016] The drive assembly also includes a drive handle, which has an anti-rotation groove, an anti-rotation protrusion fitted into the anti-rotation groove, and the drive handle is connected to the camshaft by fasteners.

[0017] In some embodiments, the bushing includes a bushing body and a mounting body disposed on the bushing body, and the crossbar is sleeved on the mounting body;

[0018] Both the mounting body and the crossbar are equipped with mounting holes, through which the camshaft is installed into the groove.

[0019] In some embodiments, one end of the sliding pin is provided with a limiting block, and one of the outer wall of the vertical rod and the limiting block is provided with a limiting hole, and the other is provided with a limiting boss. The limiting boss is used to insert into the limiting hole, and the limiting block is used to contact and cooperate with the outer wall of the vertical rod to restrict the movement of the crossbar and the bushing relative to the vertical rod.

[0020] In some embodiments, the connecting mechanism further includes an elastic element, a bushing is connected to an abutment, a sliding pin is provided with a receiving hole, the elastic element is received in the receiving hole, and one end of the elastic element abuts against the abutment and the other end abuts against the sliding pin. The elastic element is used to provide an elastic force to the sliding pin so that the sliding pin has a tendency to slide closer to the vertical rod.

[0021] This application also provides a back frame, including the connection mechanism of any of the above.

[0022] This application also provides an LED display device, including the aforementioned back frame.

[0023] Compared to the aforementioned background technology, the connection mechanism provided in this application includes a vertical rod, a bushing, a horizontal rod, a sliding pin, and a drive assembly. The bushing is fitted onto the vertical rod, and the horizontal rod is fixed to the bushing. The horizontal rod is used to connect an LED display device. The sliding pin is slidably disposed within the bushing and configured to slide between a first position and a second position. When the sliding pin is in the first position, it restricts the movement of the horizontal rod and the bushing relative to the vertical rod; when it is in the second position, it releases the restriction on the movement of the horizontal rod and the bushing. The drive assembly is movably disposed on the horizontal rod and connected to the sliding pin, and the drive assembly is used to drive the sliding pin to slide.

[0024] During installation, the drive assembly moves the sliding pin from the second position to the first position to restrict the movement of the crossbar and bushing relative to the vertical bar, thereby achieving the function of locking the crossbar and vertical bar together. During disassembly, the drive assembly moves the sliding pin from the first position to the second position to release the restriction on the movement of the crossbar and bushing, thereby switching the crossbar and vertical bar from the locked connection state to the unlocked state, making it easy to remove the crossbar and bushing from the vertical bar.

[0025] The beneficial effects of this connection mechanism mainly include:

[0026] Compared to existing methods that use screws or pipe clamps to connect horizontal and vertical bars, the connection mechanism provided in this application uses a drive component to move a sliding pin for assembly and disassembly, eliminating the need for tools. This method enables tool-free assembly and disassembly, achieving rapid assembly and disassembly. Furthermore, it ensures high safety and reliability of the connection between the horizontal and vertical bars, solving the problem that current methods cannot simultaneously meet the requirements of rapid assembly and disassembly and safe and reliable connection when connecting horizontal and vertical bars. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 This is an exploded view of the connecting mechanism in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the overall structure of the connecting mechanism in the embodiments of this application;

[0030] Figure 3 for Figure 2 The cross-sectional view of the connecting mechanism shown when the sliding pin is in the first position;

[0031] Figure 4 for Figure 3A schematic diagram of the fit between the camshaft and the sliding pin when the sliding pin is in the first position;

[0032] Figure 5 for Figure 2 The cross-sectional view of the connecting mechanism shown when the sliding pin is in the second position;

[0033] Figure 6 for Figure 5 A schematic diagram of the fit between the camshaft and the sliding pin when the sliding pin is in the second position;

[0034] Figure 7 for Figure 2 The diagram shows the cooperation between the limiting component and the limiting groove in the connecting mechanism.

[0035] in:

[0036] 10 - Vertical rod, 11 - Limiting hole;

[0037] 20-Sleeve, 21-Sleeve body, 22-Mounting body, 221-Mounting hole;

[0038] 30 - Crossbar, 31 - Connector;

[0039] 40-Sliding pin, 41-Groove, 411-First inner wall, 4111-First locking position, 412-Second inner wall, 4121-Second locking position, 42-Limiting block, 43-Limiting boss, 44-Accommodation hole;

[0040] 50-Drive assembly, 51-Camshaft, 511-Shaft body, 5111-Limit groove, 5112-Anti-rotation protrusion, 512-Cam body, 52-Drive handle, 521-Anti-rotation groove, 53-Fastener;

[0041] 60 - Limiting component;

[0042] 70 - Elastic element;

[0043] 80 - Arrival item. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Please see Figure 1and Figure 2 The connecting mechanism provided in this application embodiment is used for the back frame of an LED display device. The connecting mechanism includes a vertical rod 10, a bushing 20, a horizontal rod 30, a sliding pin 40, and a driving assembly 50. Wherein:

[0047] The vertical rod 10 serves as a support rod, providing a fixed support function.

[0048] The bushing 20 is fitted onto the vertical rod 10, and the bushing 20 can slide along the axis of the vertical rod 10 when it is unlocked.

[0049] The crossbar 30 is fixed to the bushing 20. When the bushing 20 is unlocked, the crossbar 30 can slide on the vertical bar 10. The crossbar 30 is used to connect the LED display device.

[0050] The sliding pin 40 is slidably disposed in the bushing 20. The sliding pin 40 is configured to slide back and forth between a first position and a second position. When the sliding pin 40 is in the first position, it restricts the movement of the crossbar 30 and the bushing 20 relative to the vertical bar 10. When it is in the second position, it releases the restriction on the movement of the crossbar 30 and the bushing 20.

[0051] The drive assembly 50 is movably mounted on the crossbar 30. The drive assembly 50 is connected to the sliding pin 40 and is used to drive the sliding pin 40 to slide between the first position and the second position.

[0052] It should be noted that the so-called first position refers to the position where the sliding pin 40 is engaged with the vertical rod 10, and the second position refers to the position where the sliding pin 40 is disengaged from the vertical rod 10.

[0053] In other words, when the drive assembly 50 drives the sliding pin 40 to the position of engaging with the vertical rod 10, the horizontal rod 30 and the bushing 20 are locked together with the vertical rod 10. When the drive assembly 50 drives the sliding pin 40 to the position of disengaging from the vertical rod 10, the horizontal rod 30 and the bushing 20 are released from the locked connection with the vertical rod 10.

[0054] During installation, the drive assembly 50 drives the sliding pin 40 to slide from the second position to the first position to restrict the movement of the crossbar 30 and the bushing 20 relative to the vertical bar 10, thereby achieving the function of locking the crossbar 30 and the vertical bar 10. During disassembly, the drive assembly 50 drives the sliding pin 40 to slide from the first position to the second position to release the restriction on the movement of the crossbar 30 and the bushing 20, thereby switching the crossbar 30 and the vertical bar 10 from the locked connection state to the unlocked state, making it easy to remove the crossbar 30 and the bushing 20 from the vertical bar 10.

[0055] Compared to the existing method of connecting the horizontal bar 30 and the vertical bar 10 with screws or pipe clamps, the connection mechanism provided in this application embodiment adopts a disassembly method in which the drive component 50 drives the sliding pin 40 to slide, which does not require disassembly tools. Therefore, this disassembly method can achieve tool-free disassembly and assembly, thereby achieving the purpose of quick disassembly and assembly. In addition, it can ensure high safety and reliability of the connection between the horizontal bar 30 and the vertical bar 10, solving the problem that the current connection between the horizontal bar 30 and the vertical bar 10 cannot simultaneously meet the requirements of quick disassembly and assembly and safe and reliable connection.

[0056] Please refer to the following: Figure 3 , Figure 4 , Figure 5 and Figure 6 To facilitate the locking of the sliding pin 40 and the vertical rod 10, a limiting block 42 is provided at one end of the sliding pin 40. One of the outer walls of the vertical rod 10 and the limiting block 42 is provided with a limiting hole 11, and the other with a limiting boss 43. For example, if the vertical rod 10 has a limiting hole 11, correspondingly, the limiting block 42 has a limiting boss 43. The limiting boss 43 is used to insert into the limiting hole 11, and the limiting block 42 is used to contact and engage with the outer wall of the vertical rod 10 to restrict the movement of the horizontal rod 30 and the bushing 20 relative to the vertical rod 10.

[0057] Of course, depending on actual needs, at least two sets of limiting holes 11 can be provided on the vertical rod 10. Each set has two limiting holes 11 spaced apart in the vertical direction. The number and structure of the limiting bosses 43 are adapted to a set of limiting holes 11 to ensure the locking fit between the limiting bosses 43 and the limiting holes 11. The sliding pin 40 can move along the axis of the vertical rod 10. The limiting bosses 43 can be inserted into different sets of limiting holes 11 according to actual needs, thereby meeting the adjustment requirements of the horizontal rod 30 relative to the vertical rod 10 at different connection positions.

[0058] The limiting block 42 has an arc-shaped concave wall, which is used to contact and fit with the arc-shaped convex wall of the vertical rod 10. This increases the contact area between the sliding pin 40 and the vertical rod 10, thereby increasing the friction between them and ensuring the locking state when the horizontal rod 30 and the vertical rod 10 are connected.

[0059] This configuration, with the locking engagement of the limiting boss 43 and the limiting hole 11, and the contact engagement of the limiting block 42 with the outer wall of the vertical rod 10, restricts the movement of the horizontal rod 30 and the bushing 20 relative to the vertical rod 10. This ensures the stability and reliability of the connection between the horizontal rod 30 and the bushing 20 and the vertical rod 10, and avoids the risk of slippage failure when the clamping friction is less than the external force in existing conventional pipe clamps.

[0060] Furthermore, the connecting mechanism also includes an elastic element 70, a bushing 20 connected to an abutment 80, a sliding pin 40 having a receiving hole 44, the elastic element 70 being received in the receiving hole 44, with one end of the elastic element 70 abutting against the abutment 80 and the other end abutting against the sliding pin 40, the elastic element 70 being used to provide elastic force to the sliding pin 40 so that the sliding pin 40 has a tendency to slide closer to the vertical rod 10.

[0061] It should be noted that the elastic element 70 can be a top spring. The function of the top spring includes providing assistance for the sliding pin 40 to slide from the second position to the first position, and also keeping the sliding pin 40 in a stable or balanced state when it is in the second position (unlocked position).

[0062] To facilitate the sliding of the sliding pin 40 within the bushing 20, the drive assembly 50 can be either a rotating assembly or a moving assembly. When it is a rotating assembly, the rotation of the rotating assembly relative to the crossbar 30 and the bushing 20 drives the sliding pin 40 to slide relative to the bushing 20; when it is a moving assembly, the movement of the moving assembly relative to the crossbar 30 and the bushing 20 drives the sliding pin 40 to slide relative to the bushing 20.

[0063] For example, the moving component can be a combination of a moving handle and a locking structure. The locking structure can be a snap-fit ​​structure. The moving handle is connected to the sliding pin 40. The moving handle is locked to the crossbar 30 through the snap-fit ​​structure. When it is necessary to move the sliding pin 40, the moving handle is pulled out and the sliding pin 40 is moved through the moving handle. After it is in place, the moving handle is snapped onto the crossbar 30 through the snap-fit ​​structure.

[0064] The following explanation uses the drive component 50 as an example of a rotating component.

[0065] Specifically, the sliding pin 40 is provided with a groove 41, which is a square groove. The groove 41 has a first inner wall 411 and a second inner wall 412, which are arranged opposite to each other. The drive assembly 50 includes a camshaft 51, which includes a shaft 511 and a cam body 512 disposed on the shaft 511. The camshaft 51 is rotatably disposed in the groove 41. The cam body 512 is configured to contact and cooperate with the first inner wall 411 when the shaft 511 rotates in a first direction to move the sliding pin 40 to a first position, and to contact and cooperate with the second inner wall 412 when the shaft 511 rotates in a second direction to move the sliding pin 40 to a second position.

[0066] In other words, the cylindrical surface of the cam body 512 of the camshaft 51 contacts and engages with the inner wall of the sliding pin 40, and the sliding pin 40 will move relative to the cam body 512 of the camshaft 51 as the position of the cylindrical surface changes.

[0067] It should be noted that the first direction mentioned above can be as follows: Figure 4The counterclockwise direction shown can be followed by the second direction as follows: Figure 4 In the clockwise direction shown, the distance between the first inner wall 411 and the second inner wall 412 is equal to or slightly less than the radial dimension of the camshaft 51.

[0068] Please refer to the following: Figure 3 and Figure 4 When the cylindrical surface of the cam body 512 of the camshaft 51 rotates to the side close to the vertical rod 10, the sliding pin 40 is in the first position (at the minimum sliding displacement). The limiting block 42 of the sliding pin 40 is in interference contact with the outer wall of the vertical rod 10, and the limiting boss 43 is inserted into the limiting hole 11 on the vertical rod 10. At this time, it is in the locked state. Please refer to the following: Figure 5 and Figure 6 When the cylindrical surface of the cam body 512 of the camshaft 51 rotates to a side away from the vertical rod 10, the sliding pin 40 is in the second position (at the maximum sliding displacement position). The limiting block 42 and the limiting boss 43 that cooperate with the outer wall of the vertical rod 10 will move away from the vertical rod 10, and this is the unlocked state.

[0069] In addition, a first locking position 4111 (also known as the first dead point) is provided on the first inner wall 411, and a second locking position 4121 (also known as the second dead point) is provided on the second inner wall 412. The first locking position 4111, the second locking position 4121 and the axis of the shaft 511 are arranged at the same height or coplanar. The sliding pin 40 is used to reach the first position after the cam body 512 rotates in the first direction to pass the first locking position 4111, and to reach the second position after the cam body 512 rotates in the second direction to pass the second locking position 4121.

[0070] In other words, the final contact position between the cam body 512 and the first inner wall 411 (keeping the sliding pin 40 in the first position) is located above the first locking position 4111. When the cam shaft 51 rotates counterclockwise, the cam body 512 first passes through the first locking position 4111 and then reaches the final contact position between the cam body 512 and the first inner wall 411. Setting the final contact position between the cam body 512 and the first inner wall 411 at the rear point of the first locking position 4111 can prevent the sliding pin 40 from returning to its original position and unlocking under the reaction force of the vertical rod 10. In this way, compared to the cam body 512 abutting against the first locking position 4111, setting the final contact position between the cam body 512 and the first inner wall 411 at the rear point of the first locking position 4111 can prevent the sliding pin 40 from immediately returning to its original position and unlocking in the event of accidental contact with the cam shaft 51. This achieves the effect of locking the sliding pin 40, thereby improving the stability of the locking connection state between the horizontal rod 30 and the vertical rod 10.

[0071] Similarly, the final contact position between the cam body 512 and the second inner wall 412 (keeping the sliding pin 40 in the second position) is located above the second locking position 4121. When the cam shaft 51 rotates clockwise, the cam body 512 first passes the second locking position 4121 and then reaches the final contact position between the cam body 512 and the second inner wall 412. Compared to placing the cam body 512 against the second locking position 4121, setting the final contact position between the cam body 512 and the second inner wall 412 at the rear point of the second locking position 4121 can prevent the sliding pin 40 from immediately disengaging from the unlocked state in the event of accidental contact with the cam shaft 51. This achieves the effect of locking the sliding pin 40, thereby improving the stability of the crossbar 30 in the unlocked state.

[0072] Please refer to the following: Figure 7 The shaft 511 is provided with a limiting groove 5111 along the circumferential direction. Correspondingly, the bushing 20 is connected to a limiting member 60, which extends into the limiting groove 5111, so that the rotation angle of the shaft 511 is limited within a preset range.

[0073] Of course, depending on actual needs, the limiting component 60 can be a limiting screw. The bushing 20 is provided with a screw hole. The limiting screw is screwed down into the bushing 20 and extends into the limiting groove 5111 of the shaft body 511, thereby limiting the rotation stroke of the shaft body 511 within a preset range.

[0074] The preset range is greater than 180 degrees. As can be seen from the above, the sliding pin 40 needs to slide from the first position to the second position. Therefore, the camshaft 51 needs to rotate more than 180 degrees in the circumferential direction. Therefore, the rotational stroke of the shaft 511 should be greater than 180 degrees to ensure that the sliding pin 40 slides between the first position and the second position.

[0075] In some embodiments, one end of the shaft 511 is provided with an anti-rotation protrusion 5112, which may be a D-shaped structure or a square structure. The drive assembly 50 also includes a drive handle 52, which is rotatably disposed outside the crossbar 30. The drive handle 52 is provided with an anti-rotation groove 521, and the anti-rotation protrusion 5112 is embedded in the anti-rotation groove 521. The drive handle 52 is connected to the camshaft 51 by a fastener 53 (which may be a fastening screw).

[0076] In this way, by rotating the drive handle 52, the camshaft 51 is driven to rotate in the groove 41, thereby causing the sliding pin 40 to slide between the first position and the second position.

[0077] In some embodiments, the bushing 20 includes a bushing body 21 and a mounting body 22 disposed on the bushing body 21. The mounting body 22 has a hollow square block structure. The crossbar 30 is sleeved on the mounting body 22 and connected by a plurality of connectors 31 (connecting screws).

[0078] Meanwhile, to facilitate the installation of the camshaft 51, both the mounting body 22 and the crossbar 30 are provided with mounting holes 221, through which the camshaft 51 can be installed into the groove 41.

[0079] The back frame provided in this application includes the connection mechanism described in the above specific embodiments.

[0080] This application provides an LED display device, including a display screen and the aforementioned back frame. The display screen is supported by the back frame, and the back frame can be easily removed from the display screen using the connection mechanism described in this application.

[0081] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0082] The connecting mechanism, back frame, and LED display device provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the solution and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A connecting mechanism, characterized in that, include: Vertical pole; A bushing is fitted onto the vertical rod; A crossbar, fixed to the bushing, is used to connect the LED display device; A sliding pin is slidably disposed in the bushing. The sliding pin is configured to slide between a first position and a second position. When the sliding pin is in the first position, it restricts the movement of the crossbar and the bushing relative to the vertical bar. When the sliding pin is in the second position, it releases the restriction on the movement of the crossbar and the bushing. A drive assembly is movably mounted on the crossbar and connected to the sliding pin, used to drive the sliding pin to slide.

2. The connecting mechanism as described in claim 1, characterized in that, The sliding pin is provided with a groove, and the groove has a first inner wall and a second inner wall; The drive assembly includes a camshaft, the camshaft including a shaft body and a cam body disposed on the shaft body, the camshaft being rotatably disposed in the groove, and the cam body being configured to contact and engage with the first inner wall when the shaft body rotates in a first direction to move the sliding pin to the first position, and to contact and engage with the second inner wall when the shaft body rotates in a second direction to move the sliding pin to the second position.

3. The connecting mechanism as described in claim 2, characterized in that, The first inner wall is provided with a first locking position, and the second inner wall is provided with a second locking position. The first locking position, the second locking position and the axis of the shaft are set at the same height. The sliding pin is used to reach the first position after the cam body rotates in the first direction to pass the first locking position, and to reach the second position after the cam body rotates in the second direction to pass the second locking position.

4. The connecting mechanism as described in claim 2, characterized in that, The shaft is provided with a limiting groove along the circumferential direction, and the bushing is connected to a limiting member. The limiting member extends into the limiting groove, so that the rotation angle of the shaft is limited within a preset range.

5. The connecting mechanism as described in claim 2, characterized in that, One end of the shaft is provided with an anti-rotation protrusion; The drive assembly also includes a drive handle, which has an anti-rotation groove, an anti-rotation protrusion fitted into the anti-rotation groove, and the drive handle is connected to the camshaft by fasteners.

6. The connecting mechanism as described in claim 2, characterized in that, The bushing includes a bushing body and a mounting body disposed on the bushing body, and the crossbar is sleeved on the mounting body; Both the mounting body and the crossbar are provided with mounting holes, and the camshaft is installed into the groove through the mounting holes.

7. The connecting mechanism as described in any one of claims 1-6, characterized in that, One end of the sliding pin is provided with a limiting block. The outer wall of the vertical rod and one of the limiting blocks are provided with a limiting hole, and the other is provided with a limiting boss. The limiting boss is used to insert into the limiting hole, and the limiting block is used to contact and cooperate with the outer wall of the vertical rod to restrict the movement of the crossbar and the bushing relative to the vertical rod.

8. The connecting mechanism as described in claim 7, characterized in that, The connecting mechanism further includes an elastic element, the bushing is connected to an abutment, the sliding pin is provided with a receiving hole, the elastic element is received in the receiving hole, one end of the elastic element abuts against the abutment and the other end abuts against the sliding pin, the elastic element is used to provide elastic force to the sliding pin so that the sliding pin has a tendency to slide closer to the vertical rod.

9. A backpack frame, characterized in that, Includes the connection mechanism as described in any one of claims 1-8.

10. An LED display device, characterized in that, Includes the back frame as described in claim 9.

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