Sofa armrest assembling device

The automatic pushing and alignment structure of the sofa armrest assembly device solves the problem of cumbersome plate positioning during the assembly of rectangular wooden sofa armrests, achieves fast and accurate plate alignment, and improves assembly efficiency and precision.

CN223418777UActive Publication Date: 2025-10-10HUIZHOU ZHONGJI FURNITURE MFY LTD
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Patent Information

Application Number
CN202422571187.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-23
Publication Date
2025-10-10
Estimated Expiration
2034-10-23

AI Technical Summary

Technical Problem

During the assembly process of the rectangular wooden sofa armrest, the front panel, back panel, left panel and right panel need to be aligned one by one, which results in slow manual operation and affects production efficiency.

Method used

A sofa armrest assembly device including a base, a front panel pushing component, a rear panel placement frame, a two-way telescopic component, a left panel alignment component and a right panel alignment component is adopted, and the panels are quickly aligned through an automatic pushing and alignment structure.

Benefits of technology

It improves the efficiency and accuracy of sofa armrest assembly, reduces manual adjustment time, reduces labor intensity, and improves production efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a sofa armrest assembling device, and relates to the technical field of sofa armrest assembling, the sofa armrest assembling device comprises a base and a rear plate placing rack vertically and fixedly arranged on the base, the base is provided with a front plate pushing assembly, and the front plate pushing assembly is used for placing a front plate and enabling the front plate to move towards the rear plate placing rack; a two-way telescopic assembly is arranged on the base and located between the rear plate containing frame and the front plate pushing assembly, the telescopic direction of the two-way telescopic assembly is perpendicular to the pushing direction of the front plate pushing assembly, and a left plate aligning assembly and a right plate aligning assembly are symmetrically arranged on the two-way telescopic assembly. The front plate can be automatically pushed to the rear plate placing frame through the front plate pushing assembly, and the left plate and the right plate can be quickly and accurately aligned with the front plate and the rear plate through cooperation of the bidirectional telescopic assembly, the left plate aligning assembly and the right plate aligning assembly. Manual adjusting time is reduced, convenience is achieved, the assembling efficiency is effectively improved, and the production efficiency is improved.
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Description

Technical Field

[0001] The present application relates to the technical field of sofa armrest assembly, and in particular to a sofa armrest assembly device. Background Art

[0002] Sofa armrests are an essential component of a sofa, typically located on either side, providing arm support and enhancing sitting comfort. Armrest designs vary, ranging from simple rectangular shapes, minimalist straight lines, elegant curved shapes, and even styles with decorative elements. Materials also vary, with wood, metal, and leather being common.

[0003] The assembly process for a rectangular wooden sofa armrest requires rigorous steps and requirements. First, the front, back, left, and right panels are assembled and screwed together to form a hollow cylinder with open ends. The cylinder is then placed vertically on a workbench, and the upper and lower panels are screwed to the upper and lower ends of the cylinder, respectively.

[0004] However, the above assembly process is often completed manually. When positioning the front panel, rear panel, left panel and right panel, workers need to align the edges of the panels one by one, which is rather cumbersome and slow, affecting production efficiency. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a sofa armrest assembly device, which can solve the technical problem that in the process of positioning the front panel, rear panel, left panel and right panel of a rectangular sofa armrest, workers need to align the edges of the panels one by one, which is cumbersome, the manual operation speed is slow, and affects production efficiency.

[0006] An embodiment of the present application provides a sofa armrest assembly device, comprising a base and a rear panel placement rack vertically fixed on the base, a front panel pushing assembly being provided on the base, the front panel pushing assembly being used to place the front panel and move the front panel toward the rear panel placement rack, a two-way telescopic assembly being provided on the base between the rear panel placement rack and the front panel pushing assembly, the telescopic direction of the two-way telescopic assembly being perpendicular to the pushing direction of the front panel pushing assembly, a left panel alignment assembly and a right panel alignment assembly being symmetrically provided on the two-way telescopic assembly, a make way channel for the movement of the front panel being formed between the left panel alignment assembly and the right panel alignment assembly.

[0007] Furthermore, the front plate pushing assembly includes a front plate pushing cylinder and a front plate placing rack, the front plate pushing cylinder is fixed on the base, one side of the front plate placing rack is fixedly connected to the telescopic end of the front plate pushing cylinder, and the front plate placing rack is arranged parallel to the rear plate placing rack.

[0008] Further, the opposite side of the front plate rack and the back plate rack is horizontally fixed with an L-shaped support limiting plate which is bent upward, and the distance between the two L-shaped support limiting plates and the top of the base is the same.

[0009] Further, a group of sliding blocks are symmetrically fixed at the bottom of the front plate rack, the bottom of the sliding block is provided with a first sliding groove, and a first guide rod matched with the first sliding groove is fixed on the base, and the sliding block is slidably connected with the first guide rod through the first sliding groove.

[0010] Further, the bidirectional telescopic assembly comprises a bidirectional sliding table air cylinder, a left support seat and a right support seat, the left support seat and the right support seat correspond to the two telescopic rods of the bidirectional sliding table air cylinder, the left support seat and the right support seat are respectively fixed on the corresponding position of the telescopic rod, the left plate alignment assembly is arranged on the left support seat, and the right plate alignment assembly is fixed on the right support seat.

[0011] Further, the bottom of the left support seat and the right support seat is provided with a second sliding groove, and a second guide rod matched with the second sliding groove is fixed on the base, and the left support seat and the right support seat are slidably connected with the second guide rod through the corresponding position of the second sliding groove.

[0012] Further, the left plate alignment assembly and the right plate alignment assembly both comprise an alignment air cylinder, a placing seat, a connecting piece and a mounting seat, the alignment air cylinder is fixed on the corresponding position of the support seat, the mounting seat is fixed on the alignment air cylinder, the placing seat is movably connected with the telescopic rod of the alignment air cylinder, one end of the connecting piece is movably connected with the placing seat, and the other end of the connecting piece is movably connected with the mounting seat.

[0013] Further, a right plate positioning rod is horizontally fixed on the left support seat, one end of the right plate positioning rod away from the left support seat is fixed with a right plate positioning plate, a left plate positioning rod is horizontally fixed on the right support seat, and one end of the left plate positioning rod away from the right support seat is fixed with a left plate positioning plate; when the left support seat and the right support seat are close to each other, the left plate positioning plate and the right plate positioning plate are away from each other.

[0014] Further, the L-shaped support limiting plate on the front plate rack is fixed with a connecting seat, a pressing plate is rotatably connected to the connecting seat, a torsional spring is arranged at the connection between the pressing plate and the connecting seat, and the upper end of the pressing plate is abutted with the front plate rack under the action force of the torsional spring.

[0015] The utility model discloses the following beneficial effects:

[0016] The utility model can automatically push the front panel toward the rear panel placement rack through the front panel pushing component. The cooperation of the two-way telescopic component and the left panel alignment component and the right panel alignment component can quickly and accurately align the left panel and the right panel with the front panel and the rear panel, reducing the time for manual adjustment. Compared with the existing technology, it is more convenient, effectively improves the assembly efficiency, and improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the structure of some embodiments of the present application;

[0019] Figure 2 This is a front view of some embodiments of the present application;

[0020] Figure 3 A top view of some embodiments of the present application;

[0021] Figure 4 are cross-sectional views of some embodiments of the present application;

[0022] Figure 5 This is a schematic diagram of the usage status in some embodiments of the present application.

[0023] The reference numerals are:

[0024] 1. Base; 2. Rear plate placement rack; 3. Front plate pushing assembly; 31. Front plate pushing cylinder; 32. Front plate placement rack; 4. Bidirectional telescopic assembly; 41. Bidirectional slide cylinder; 42. Left support seat; 43. Right support seat; 5. Left plate alignment assembly; 51. Alignment cylinder; 52. Placement seat; 53. Connector; 54. Mounting seat; 6. Right plate alignment assembly; 7. L-shaped support limit plate; 8. Slider; 9. First slide groove; 10. First guide rod; 11. Second slide groove; 12. Second guide rod; 13. Right plate positioning rod; 14. Right plate positioning plate; 15. Left plate positioning rod; 16. Left plate positioning plate; 17. Connecting seat; 18. Clamping plate; 19. Torsion spring. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0028] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0030] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. Specific embodiment:

[0032] like Figure 1-4The cam 2 is actuated by a lever 24 which is secured to the base 1 and cam 25 so that the lever 24 can be moved to its proper position to move the cam 25. The cam 24 is secured to the base 1 and cam 25 by a lever 24 which is secured to the base 1 and cam 25 for positioning the cam 25 in a forward direction.

[0033] like Figure 1-4 As shown, the front plate pushing assembly 3 includes a front plate pushing cylinder 31 and a front plate placing rack 32. The front plate pushing cylinder 31 is fixed on the base 1, and one side of the front plate placing rack 32 is fixedly connected to the telescopic end of the front plate pushing cylinder 31. The front plate pushing cylinder 31 can quickly and automatically push the front plate placing rack 32 forward, so that the front plate accurately approaches the rear plate placing rack 2. The front plate placing rack 32 is arranged parallel to the rear plate placing rack 2, ensuring that the movement direction of the front plate is accurate during the pushing process and can be directly aligned with the rear plate.

[0034] like Figure 3 and Figure 4 As shown, an L-shaped support and limit plate 7 bent upward is horizontally fixed to the side opposite to the front plate placement rack 32 and the rear plate placement rack 2. The L-shaped support and limit plate 7 can provide accurate positioning and support for the front and rear plates. When the front plate is pushed forward, its bottom edge will be accurately limited by the L-shaped support and limit plate 7 on the front plate placement rack 32, ensuring that the position of the front plate in the horizontal direction is stable and accurate. Similarly, the rear plate placed on the rear plate placement rack 2 can also be limited by the corresponding L-shaped support and limit plate 7, so that the front and rear plates can be accurately aligned when docking, thereby improving the assembly accuracy of the sofa armrests. The two L-shaped support and limit plates 7 are at the same distance from the top of the base 1, ensuring that the front and rear plates are at the same height, avoiding docking deviation caused by height inconsistency, and further enhancing the accuracy of assembly.

[0035] like Figure 1 、 Figure 3 and Figure 4As shown, a group of sliders 8 are symmetrically fixed to the bottom of the front plate placement rack 32, and a first slide groove 9 is provided at the bottom of the slider 8. A first guide rod 10 adapted to the first slide groove 9 is fixed on the base 1, and the slider 8 is slidably connected to the first guide rod 10 through the first slide groove 9. The cooperation between the slider 8 and the first guide rod 10 ensures the stability of the front plate placement rack 32 during movement. When the front plate placement rack 32 is pushed by the front plate pushing cylinder 31, the slider 8 slides along the first guide rod 10, so that the front plate placement rack 32 moves along a specific straight line direction, thereby ensuring that the front plate can accurately approach and align with the back plate placed on the back plate placement rack 2, greatly improving the accuracy of sofa armrest assembly.

[0036] like Figure 2-4 As shown, the bidirectional telescopic assembly 4 includes a bidirectional sliding cylinder 41, a left support seat 42 and a right support seat 43. The left support seat 42 and the right support seat 43 correspond to the telescopic rods on both sides of the bidirectional sliding cylinder 41 one by one. The left support seat 42 and the right support seat 43 are respectively fixed on the telescopic rods at corresponding positions. The left plate alignment assembly 5 is arranged on the left support seat 42, and the right plate alignment assembly 6 is fixed on the right support seat 43. The bidirectional sliding cylinder 41 can quickly and accurately realize the synchronous telescopic action of the telescopic rods on both sides, thereby driving the left support seat 42 and the right support seat 43 to move at the same time, and can quickly adjust the left plate alignment assembly 5 and the right plate alignment assembly 6 to the appropriate position so as to align with the front plate and the rear plate, saving assembly time and improving the assembly efficiency of the sofa armrests.

[0037] like Figure 1-3 As shown, the bottom of the left support seat 42 and the right support seat 43 are both provided with a second slide groove 11, and the base 1 is fixed with a second guide rod 12 adapted to the second slide groove 11. The left support seat 42 and the right support seat 43 are slidably connected to the second guide rod 12 through the second slide groove 11 at the corresponding position respectively. The cooperation of the second slide groove 11 and the second guide rod 12 provides precise guidance for the movement of the left support seat 42 and the right support seat 43. When the bidirectional slide cylinder 41 drives the left support seat 42 and the right support seat 43 to move, they can accurately slide along the established straight line direction to ensure that the left plate alignment assembly 5 and the right plate alignment assembly 6 can be accurately positioned with the front plate. At the same time, the second guide rod 12 provides stable support for the left support seat 42 and the right support seat 43, making them more stable during the movement.

[0038] like Figure 1 and Figure 2As shown, the left plate alignment assembly 5 and the right plate alignment assembly 6 both include an alignment cylinder 51, a placement seat 52, a connector 53 and a mounting seat 54. The alignment cylinder 51 is fixedly mounted on the left support seat 42 or the right support seat 43 at the corresponding position, and the mounting seat 54 is fixedly mounted on the alignment cylinder 51. The placement seat 52 is movably connected to the telescopic rod of the alignment cylinder 51. One end of the connector 53 is movably connected to the placement seat 52, and the other end of the connector 53 is movably connected to the mounting seat 54. The arrangement of the connector 53 enhances the connection stability between the placement seat 52 and the mounting seat 54, avoids shaking or offsetting of the placement seat 52 during the alignment process, and ensures To ensure the accuracy of alignment, specifically, the side of the placement seat 52 away from the connecting member 53 is the placement surface of the left plate or the right plate, and the lower end of the placement surface is located on the placement seat 52 and a support member supporting the left plate or the right plate is provided. When the telescopic rod of the alignment cylinder 51 is retracted downward, under the action of the connecting member 53, the placement seat 52 swings to the side away from the connecting member 53, and makes the lower end of the placement seat 52 abut against the left support seat 42 or the right support seat 43. At this time, the placement surface of the placement seat 52 for the left or right plate is perpendicular to the rear plate placement rack 2 and the front plate placement rack 32, ensuring that the left plate and right plate placed on the placement surface of the placement seat 52 are aligned with the front plate and the rear plate.

[0039] like Figure 2-4 As shown, a right plate positioning rod 13 is horizontally fixed on the left support seat 42, and a right plate positioning plate 14 is fixed on the end of the right plate positioning rod 13 away from the left support seat 42, and a left plate positioning rod 15 is horizontally fixed on the right support seat 43, and a left plate positioning plate 16 is fixed on the end of the left plate positioning rod 15 away from the right support seat 43. When the left support seat 42 and the right support seat 43 are close to each other, the left plate positioning plate 16 and the right plate positioning plate 14 are away from each other. The setting of the right plate positioning plate 14 and the left plate positioning plate 16 can effectively prevent the left and right plates from offsetting or misaligning during the alignment process, ensuring that the connection between the plates is tight and the angle is accurate, thereby ensuring the consistency of the overall shape and size of the sofa armrest. Specifically, when the placement surface of the left or right plate placed on the placement seat 52 is perpendicular to the rear plate placement frame 2 and the front plate placement frame 32, the left plate positioning plate 16 abuts against the left plate at the corresponding position, and the right plate positioning plate 14 abuts against the right plate at the corresponding position, so that the relative positions of the left, right, front and rear plates are accurate.

[0040] like Figure 3 and Figure 4As shown, the L-shaped supporting limit plate 7 on the front plate placement frame 32 is fixedly provided with a connecting seat 17, and the connecting seat 17 is rotatably connected to a clamping plate 18. A torsion spring 19 is provided at the connection between the clamping plate 18 and the connecting seat 17, and the upper end of the clamping plate 18 is in contact with the front plate placement frame 32 under the action of the torsion spring 19. The clamping plate 18 is in contact with the front plate placement frame under the action of the torsion spring 19, and can apply a stable pressure to the front plate placed on the front plate placement frame 32 to prevent the front plate from shaking or shifting during the assembly process, ensuring that the front plate always remains in the correct position, thereby improving the accuracy and stability of the sofa armrest assembly. When the front plate needs to be placed, it only needs to rotate the clamping plate 18 downward to easily place the front plate on the front plate placement frame 32. After placement is completed, the clamping plate 18 automatically resets and clamps the front plate under the action of the torsion spring 19. The operation is simple and fast, and the work efficiency is improved.

[0041] Working principle:

[0042] like Figure 1-5 As shown, in the initial state, the telescopic rod of the front plate pushing cylinder 31 is retracted, the telescopic rod of the two-way sliding cylinder 41 is extended, and the telescopic rod of the alignment cylinder 51 is extended, and the rear plate is placed on the L-shaped support and limit plate 7 of the rear plate placement frame 2, and the holding plate 18 is rotated downward, and the front plate is placed on the L-shaped support and limit plate 7 of the front plate placement frame 32. After placement is completed, the holding plate 18 automatically resets and holds the front plate tightly under the action of the torsion spring 19, and the left plate is placed on the placement seat 52 of the left plate alignment component 5, and the right plate is placed on the placement seat 52 of the right plate alignment component 6. Then the telescopic rod of the front plate pushing cylinder 31 is extended, and the front plate placement frame 32 moves along the first guide rod 10 through the slider 8, driving the front plate to accurately approach the rear plate, and the telescopic rod of the two-way sliding cylinder 41 is retracted, so that the left plate The support seat 42 and the right support seat 43 approach each other, thereby driving the left plate and its components and the right plate and its components to approach each other, so that the left plate and the right plate are close to each other, and at the same time the telescopic rod of the alignment cylinder 51 is retracted, and the placement is swung left and upward, so that the left plate and the right plate on the placement seat 52 at the corresponding position are perpendicular to the rear plate placement frame 2 and the front plate placement frame 32, and the left plate positioning plate 16 is abutted against the left plate at the corresponding position, and the right plate positioning plate 14 is abutted against the right plate at the corresponding position. In the process of the front plate, the rear plate, the left plate and the right plate approaching each other, they are aligned to form a hollow cylindrical structure with openings at the upper and lower ends. Then the staff uses screws to fix the two adjacent plates, rotates the tightening plate 18 downward, and takes out the assembled hollow cylinder upward to complete the positioning and assembly of the front plate, the rear plate, the left plate and the right plate.

[0043] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A sofa armrest assembly device, characterized in that: The sled is provided with a front plate pushing assembly, and the front plate pushing assembly is used to place the front plate and move the front plate toward the sled. A two-way telescopic assembly is provided on the base between the sled and the front plate pushing assembly, and the telescopic direction of the two-way telescopic assembly is perpendicular to the pushing direction of the front plate pushing assembly. A left plate alignment assembly and a right plate alignment assembly are symmetrically provided on the two-way telescopic assembly, and a clearance channel for the movement of the front plate is formed between the left plate alignment assembly and the right plate alignment assembly.

2. The sofa armrest assembly device according to claim 1, characterized in that: The front plate pushing assembly includes a front plate pushing cylinder and a front plate placing rack. The front plate pushing cylinder is fixed on the base. One side of the front plate placing rack is fixedly connected to the telescopic end of the front plate pushing cylinder. The front plate placing rack is arranged parallel to the rear plate placing rack.

3. The sofa armrest assembly device according to claim 2, characterized in that: An L-shaped support and limiting plate bent upward is horizontally fixed on one side of the front plate placement rack opposite to the rear plate placement rack, and the distance between the two L-shaped support and limiting plates and the top of the base is the same.

4. The sofa armrest assembly device according to claim 2, characterized in that: A group of sliders are symmetrically fixed to the bottom of the front plate placement rack, a first slide groove is provided at the bottom of the slider, a first guide rod adapted to the first slide groove is fixed on the base, and the slider is slidably connected to the first guide rod through the first slide groove.

5. The sofa armrest assembly device according to claim 1, characterized in that: The bidirectional telescopic assembly includes a bidirectional sliding cylinder, a left support seat and a right support seat. The left support seat and the right support seat correspond one-to-one to the telescopic rods on both sides of the bidirectional sliding cylinder. The left support seat and the right support seat are respectively fixed on the telescopic rods at corresponding positions. The left plate alignment assembly is arranged on the left support seat, and the right plate alignment assembly is fixed on the right support seat.

6. The sofa armrest assembly device according to claim 5, characterized in that: The bottom of the left support seat and the bottom of the right support seat are both provided with a second sliding groove, and a second guide rod adapted to the second sliding groove is fixed on the base. The left support seat and the right support seat are respectively slidably connected to the second guide rod through the second sliding grooves at corresponding positions.

7. The sofa armrest assembly device according to claim 5, characterized in that: The left plate alignment assembly and the right plate alignment assembly both include an alignment cylinder, a placement seat, a connector and a mounting seat. The alignment cylinder is fixedly mounted on a support seat at a corresponding position, the mounting seat is fixedly mounted on the alignment cylinder, the placement seat is movably connected to the telescopic rod of the alignment cylinder, one end of the connector is movably connected to the placement seat, and the other end of the connector is movably connected to the mounting seat.

8. The sofa armrest assembly device according to claim 7, characterized in that: A right plate positioning rod is fixed horizontally on the left support seat, and a right plate positioning plate is fixed on the end of the right plate positioning rod away from the left support seat. A left plate positioning rod is fixed horizontally on the right support seat, and a left plate positioning plate is fixed on the end of the left plate positioning rod away from the right support seat. When the left support seat and the right support seat approach each other, the left plate positioning plate and the right plate positioning plate move away from each other.

9. The sofa armrest assembly device according to claim 3, characterized in that: The L-shaped support limit plate on the front plate placement rack is fixed with a connecting seat, and a clamping plate is rotatably connected to the connecting seat. A torsion spring is provided at the connection between the clamping plate and the connecting seat, and the upper end of the clamping plate is in contact with the front plate placement rack under the action of the torsion spring.

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