Mistake-proof and fool-proof structure of SMT steel mesh

Abstract

The utility model discloses an SMT steel mesh mistake-proof and fool-proof structure, which comprises a framed SMT steel mesh and a U-shaped mounting seat, and one side of the framed SMT steel mesh is a concave surface. A plurality of mounting bolts are movably mounted on the U-shaped mounting seat; when in use, the positioning plate and the positioning strip can be drawn out of the cleaning equipment for adjustment, so that a hand does not need to stretch into the cleaning equipment for adjustment, the adjustment process is more visual, and the positions of the positioning plate and the positioning strip can be adjusted and mounted according to the size of the framed SMT steel mesh; according to the SMT steel mesh cleaning device, a U-shaped guide rod is arranged on a U-shaped mounting seat, so that the SMT steel mesh cleaning device can adapt to cleaning of framed SMT steel meshes with different sizes, the U-shaped guide rod is separated from the U-shaped mounting seat in the process of pulling a positioning plate, the framed SMT steel mesh can be turned over at the moment, and the turn-over effect can be achieved after the framed SMT steel mesh is turned over by 180 degrees; and then the SMT steel mesh with the frame and the positioning plate are pushed back again, so that the reverse side can be cleaned, and the operation is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of steel mesh cleaning, in particular to an anti-error and anti-fool structure for an SMT steel mesh. Background Art

[0002] SMT stencil is a key tool used for printing solder paste or patch adhesive in the SMT (surface mount technology) process. Its main function is to accurately print solder paste or patch adhesive on the designated position of PCB (printed circuit board) to provide necessary materials for subsequent component placement and welding.

[0003] In the prior art, a patent with publication number CN220576872U discloses a steel mesh anti-mistake slide mechanism. When the SMT steel mesh is cleaned by a steel mesh cleaning machine, a steel mesh limit buckle is set. When the steel mesh limit buckle is opened to a horizontal state, the steel mesh is put in, and at this time, the steel mesh limit buckle protrudes out of the plane where the safety door is located, the safety door cannot be closed, and the equipment cannot be started. After the steel mesh is pushed to the bottom, the steel mesh limit buckle is closed, the safety door can be closed, and the equipment starts normally, which can effectively prevent the risks of equipment motor burning, mechanism deformation, and steel mesh damage caused by misoperation when the steel mesh is not pushed into place.

[0004] However, since the structure in the above patent is installed inside the steel mesh cleaning machine, the vertical limit plate and horizontal slide groove used to adjust according to the size of the SMT steel mesh need to be inserted into the equipment to adjust their positions. Due to the limited internal space of the steel mesh cleaning equipment, it is not easy to intuitively view or judge the specific position that needs to be adjusted during adjustment. In addition, the SMT steel mesh needs to be matched with the outer frame when cleaning. The SMT steel mesh is installed on the outer frame and then inserted into the cleaning equipment. The SMT steel mesh with a frame has a flat surface on one side and a concave surface on the other side. Solder paste is usually printed on the concave surface. Therefore, the concave surface of the SMT steel mesh is mainly cleaned. However, the above patent does not restrict the installation direction of the SMT steel mesh, resulting in that it can be inserted in both directions. In a steel mesh cleaning machine that only supports single-sided cleaning, if the SMT steel mesh is installed upside down, it will affect the cleaning effect and efficiency. Therefore, a SMT steel mesh anti-error and anti-fool structure is needed to meet people's needs. Utility Model Content

[0005] The utility model aims to provide an SMT steel mesh error-proof and fool-proof structure to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an SMT steel mesh error-proofing and fool-proofing structure, comprising a framed SMT steel mesh and a U-shaped mounting seat, one side of the framed SMT steel mesh is a concave surface; a plurality of mounting bolts are movably mounted on the U-shaped mounting seat, a sliding frame is slidably mounted on the inner wall of the U-shaped mounting seat, an adjustment structure is mounted on one side of the sliding frame, two sleeve shafts are mounted on the adjustment structure, blocking structures are mounted on the two sleeve shafts, linkage screw rods are mounted on the two blocking structures, and error-proofing structures are mounted on the two linkage screw rods;

[0007] The adjustment structure includes an adjustment frame, which is rotatably mounted on one side of the sliding frame, a bidirectional screw rod is rotatably mounted on the inner wall of the adjustment frame, a knob is fixedly sleeved on the bidirectional screw rod, two adjustment sliders are threadedly mounted on the bidirectional screw rod, the two adjustment sliders are slidably mounted on the inner wall of the adjustment frame, positioning plates are fixedly mounted on the two adjustment sliders, guide rail grooves are provided on the two positioning plates, and the framed SMT steel mesh is movably mounted in the two guide rail grooves, two L-shaped brackets are symmetrically fixedly mounted on one side of the adjustment frame, the two L-shaped brackets are rotatably mounted with adjustment screw rods, one end of the two adjustment screw rods are rotatably mounted on one side of the adjustment frame, the same positioning bar is threadedly mounted on the two adjustment screw rods, and the two positioning plates are slidably mounted on the positioning bar;

[0008] The blocking structure includes a limit buckle, which is fixedly mounted on a sleeve shaft, and the sleeve shaft is rotatably mounted on the inner wall of a positioning plate. The limit buckle contacts one side of the SMT steel mesh with a frame, and a positioning bolt is movably mounted on the limit buckle. A threaded hole is opened on one side of the positioning plate, and the positioning bolt is threadedly mounted in the threaded hole.

[0009] Preferably, the error-proofing structure includes an L-shaped movable plate, which is fixedly mounted on one end of a linkage screw rod, which is threadedly mounted on the inner wall of the sleeve shaft, and a pressure block is fixedly mounted on one side of the L-shaped movable plate, which contacts the concave inner wall of the framed SMT steel mesh.

[0010] Preferably, the inner wall of the positioning plate is provided with two guide slots, guide slide bars are slidably installed in the two guide slots, and the two guide slide bars are fixedly installed on one side of the L-shaped movable plate.

[0011] Preferably, an adjusting screw hole is provided on the inner wall of the sleeve shaft, and the linkage screw rod is threadedly installed in the adjusting screw hole.

[0012] Preferably, the positioning bar is provided with two movable holes, the two positioning plates are slidably installed in the two movable holes respectively, the inner wall of the adjusting slider is provided with a threaded hole, and the bidirectional screw is threadedly installed in the threaded hole.

[0013] Preferably, a limiting rotation groove is formed on the inner wall of the sliding frame, and a T-shaped rotating block is fixedly mounted on one side of the adjusting frame, and the T-shaped rotating block is rotatably mounted in the limiting rotation groove.

[0014] Preferably, the inner walls on both sides of the U-shaped mounting seat are provided with T-shaped guide grooves, T-shaped sliders are slidably installed in the two T-shaped guide grooves, the two T-shaped sliders are respectively fixedly installed on both sides of the sliding frame, and two U-shaped guide rods are fixedly installed on the adjustment frame, and the two U-shaped guide rods are movably installed on the U-shaped mounting seat.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] (1) The utility model can be used to pull out the positioning plate and the positioning strip from the cleaning device for adjustment, so there is no need to put hands into the cleaning device for adjustment. The adjustment process is more intuitive. The positions of the positioning plate and the positioning strip can be adjusted and installed according to the size of the framed SMT steel mesh, so that it can adapt to the cleaning of framed SMT steel meshes of different sizes. In the process of pulling the positioning plate, the U-shaped guide rod will be separated from the U-shaped mounting seat. At this time, the framed SMT steel mesh can be flipped. After the framed SMT steel mesh is flipped 180 degrees, the flipping effect can be achieved. Then, the framed SMT steel mesh and the positioning plate can be pushed back to clean the reverse side, which is more convenient to operate.

[0017] (2) In the process of closing the L-shaped movable plate, the pressing block will come into contact with the concave inner wall of the framed SMT steel mesh. If the framed SMT steel mesh is in the reversed state, the pressing block will be against the plane of the framed SMT steel mesh, so that the limit buckle cannot be completely closed, thereby attracting the attention of the staff, avoiding the reverse installation, preventing mistakes, and improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional structural diagram of an SMT steel mesh error-proofing and fool-proofing structure proposed by the utility model;

[0019] Figure 2 This is a side view structural diagram of an SMT steel mesh error-proofing and fool-proofing structure proposed by the utility model;

[0020] Figure 3 A schematic diagram of the wire hole structure of an SMT steel mesh anti-error and anti-fool structure proposed by the utility model;

[0021] Figure 4 A schematic diagram of the structure of an adjustment frame of an SMT steel mesh anti-error and anti-fool structure proposed by the utility model;

[0022] Figure 5 This is a schematic cross-sectional structure diagram of a sliding frame of an SMT steel mesh anti-error and anti-fool structure proposed by the utility model;

[0023] Figure 6This is a schematic cross-sectional structure diagram of a positioning plate of an SMT steel mesh anti-error and anti-fool structure proposed by the utility model.

[0024] In the figure: 1. SMT steel mesh with frame; 2. U-shaped mounting seat; 3. Mounting bolt; 4. Sliding frame; 41. Adjusting frame; 42. Bidirectional screw; 43. Knob; 44. Adjusting slider; 45. Positioning plate; 46. Guide groove; 47. L-shaped bracket; 48. Adjusting screw; 49. Positioning strip; 410. Movable hole; 411. Threaded hole; 412. Restricting rotation groove; 413. T-shaped rotating block; 414. T-shaped guide groove; 415. T-shaped slider; 416. U-shaped guide rod; 5. Sleeve shaft; 51. Limiting buckle; 52. Positioning bolt; 53. Threaded hole; 6. Linkage screw; 61. L-shaped movable plate; 62. Pressure block; 63. Guide slide groove; 64. Guide slide rod; 65. Adjusting screw hole. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example 1: Please refer to Figure 1-6 The utility model provides a technical solution: an SMT steel mesh error-proofing and fool-proofing structure, comprising a framed SMT steel mesh 1 and a U-shaped mounting seat 2, one side of the framed SMT steel mesh 1 is a concave surface; it is characterized in that: a plurality of mounting bolts 3 are movably mounted on the U-shaped mounting seat 2, a sliding frame 4 is slidably mounted on the inner wall of the U-shaped mounting seat 2, an adjusting structure is mounted on one side of the sliding frame 4, two sleeve shafts 5 are mounted on the adjusting structure, blocking structures are mounted on the two sleeve shafts 5, linkage screw rods 6 are mounted on the two blocking structures, and error-proofing structures are mounted on the two linkage screw rods 6;

[0027] The adjustment structure includes an adjustment frame 41, which is rotatably mounted on one side of the sliding frame 4, a bidirectional screw rod 42 is rotatably mounted on the inner wall of the adjustment frame 41, a knob 43 is fixedly sleeved on the bidirectional screw rod 42, two adjustment sliders 44 are threadedly mounted on the bidirectional screw rod 42, the two adjustment sliders 44 are both slidably mounted on the inner wall of the adjustment frame 41, positioning plates 45 are fixedly mounted on the two adjustment sliders 44, guide rail grooves 46 are opened on the two positioning plates 45, and the framed SMT steel mesh 1 is movably mounted in the two guide rail grooves 46, two L-shaped brackets 47 are symmetrically fixedly mounted on one side of the adjustment frame 41, and adjusting screw rods 48 are rotatably mounted on the two L-shaped brackets 47, one end of the two adjusting screw rods 48 are rotatably mounted on one side of the adjustment frame 41, the same positioning bar 49 is threadedly mounted on the two adjusting screw rods 48, and the two positioning plates 45 are both slidably mounted on the positioning bar 49;

[0028] The blocking structure includes a limit buckle 51, which is fixedly mounted on the sleeve shaft 5, and the sleeve shaft 5 is rotatably mounted on the inner wall of the positioning plate 45. The limit buckle 51 contacts one side of the framed SMT steel mesh 1, and a positioning bolt 52 is movably mounted on the limit buckle 51. A thread hole 53 is opened on one side of the positioning plate 45, and the positioning bolt 52 is threadedly mounted in the thread hole 53. By pulling the two positioning plates 45, it can be pulled out of the cleaning equipment, and the adjustment frame 41 and the knob 43 will also be moved out of the cleaning equipment. At this time, the knob 43 can be rotated according to the size of the framed SMT steel mesh 1 to adjust the distance between the two positioning plates 45, and then Then, the two adjusting screw rods 48 are rotated to adjust the position of the positioning bar 49 so that the space formed between the positioning bar 49 and the two positioning plates 45 matches the size of the framed SMT steel mesh 1. In the process of pulling out the entire positioning plate 45, the U-shaped guide rod 416 will be driven to detach from the U-shaped mounting seat 2. At this time, the restriction on the angle of the adjusting frame 41 can be released, and then the positioning plate 45 is flipped over to drive the adjusting frame 41 to rotate. The adjusting frame 41 will drive the T-shaped rotating block 413 to rotate in the limiting rotating groove 412 to achieve the flipping effect. By flipping the positioning plate 45 one hundred and eighty degrees, the flipping operation of the framed SMT steel mesh 1 can be achieved.

[0029] In order to be able to adjust the distance between the two adjusting sliders 44, two movable holes 410 are provided on the positioning bar 49, and the two positioning plates 45 are respectively slidably installed in the two movable holes 410. The inner wall of the adjusting slider 44 is provided with a threaded hole 411, and the bidirectional screw rod 42 is threadedly installed in the threaded hole 411. When the bidirectional screw rod 42 rotates, it will drive the two adjusting sliders 44 to move towards or away from each other through the cooperation with the two threaded holes 411.

[0030] In order to enable the adjustment frame 41 to achieve a flipping effect so as to flip and adjust the direction of the SMT steel mesh 1, a limiting rotation groove 412 is opened on the inner wall of the sliding frame 4, and a T-shaped rotating block 413 is fixedly installed on one side of the adjustment frame 41. The T-shaped rotating block 413 is rotatably installed in the limiting rotation groove 412. The adjustment frame 41 will drive the T-shaped rotating block 413 to rotate in the limiting rotation groove 412.

[0031] In order to limit the moving direction of the sliding frame 4, T-shaped guide grooves 414 are provided on the inner walls of both sides of the U-shaped mounting seat 2, and T-shaped sliders 415 are slidably installed in the two T-shaped guide grooves 414. The two T-shaped sliders 415 are fixedly installed on both sides of the sliding frame 4, and two U-shaped guide rods 416 are fixedly installed on the adjusting frame 41. The two U-shaped guide rods 416 are movably installed on the U-shaped mounting seat 2. The sliding sliding frame 4 will drive the two T-shaped sliders 415 to slide in the two T-shaped guide grooves 414 respectively. In the process of pulling out the entire positioning plate 45, the U-shaped guide rod 416 will be driven to detach from the U-shaped mounting seat 2. At this time, the restriction on the angle of the adjusting frame 41 can be released.

[0032] The working principle is: when in use, the U-shaped mounting seat 2 can be installed in the cleaning equipment using the mounting bolts 3, and the restriction on the limit buckle 51 can be released by rotating the positioning bolt 52 and screwing it out of the thread hole 53. The limit buckle 51 is flipped to be in the expanded state, and then the two positioning plates 45 can be pulled to drive the adjustment frame 41 to slide through the adjusting slider 44, and the sliding adjustment frame 41 will drive the sliding frame 4 to slide through the T-shaped turning block 413. The positioning plate 45 can be pulled out of the cleaning equipment by continuously pulling it, and the adjustment frame 41 and the knob 43 will also be moved out of the cleaning equipment. At this time, the spacing between the two positioning plates 45 can be adjusted according to the size of the framed SMT steel mesh 1, and the knob 43 can be turned. When the knob 43 is turned, it will drive the bidirectional thread The rod 42 rotates on the adjustment frame 41, and the two-way screw rod 42 rotates, which drives the two adjustment sliders 44 to move towards or away from each other, so that the two positioning plates 45 respectively follow the movement of the two adjustment sliders 44, so that the spacing between the two positioning plates 45 can be adjusted. During the adjustment process, the positioning plate 45 will slide in the movable hole 410 on the positioning bar 49, so that the positioning bar 49 will not interfere with the positioning plate 45, and then the two adjustment screw rods 48 are rotated. When the adjustment screw rod 48 rotates, it will rotate on the L-shaped bracket 47 and drive the positioning bar 49 to slide, so that the space formed between the positioning bar 49 and the two positioning plates 45 matches the size of the framed SMT steel mesh 1. At this time, the framed SMT steel mesh 1 can be inserted into the two The limit buckle 51 is then turned over to make it contact with the SMT steel mesh 1 with a frame. During the process, the turned limit buckle 51 will drive the sleeve shaft 5 to rotate on the inner wall of the positioning plate 45, so that the limit buckle 51 has the sleeve shaft 5 as a rotation fulcrum. The continuously rotating sleeve shaft 5 will drive the linkage screw rod 6 to move through the cooperation with the adjusting screw hole 65. The moving linkage screw rod 6 will drive the L-shaped movable plate 61 to move, so that the moving L-shaped movable plate 61 drives the guide slide bar 64 to slide in the guide slide groove 63. Through the cooperation between the guide slide bar 64 and the guide slide groove 63, the moving direction of the L-shaped movable plate 61 is limited. The continuously moving L-shaped movable plate 61 will drive the pressing block 62 to contact the concave inner wall of the SMT steel mesh 1 with a frame. If the installation position of the framed SMT steel mesh 1 is opposite, the pressure block 62 will be squeezed on the plane of the framed SMT steel mesh 1 during the flipping process of the limit buckle 51, so that the limit buckle 51 cannot continue to flip and the limit buckle 51 cannot be completely closed, thereby avoiding the reverse installation of the framed SMT steel mesh 1. At the same time, in order to clearly distinguish the surface of the framed SMT steel mesh 1 that needs to be cleaned, after the installation is completed, it is pushed into the cleaning equipment and the hatch of the cleaning equipment is closed. When it is necessary to flip and adjust the framed SMT steel mesh 1, the hatch is opened to pull out the entire positioning plate 45. During the process, the U-shaped guide rod 416 will be driven to detach from the U-shaped mounting seat 2. At this time, the restriction on the angle of the adjustment frame 41 can be released, and then the positioning plate 45 is flipped to drive the adjustment frame 41 to rotate.By turning the positioning plate 45 180 degrees, the turning operation of the framed SMT steel mesh 1 can be realized.

[0033] Example 2: Figure 1-6 In order to prevent the SMT steel mesh 1 from being installed in the reverse direction, a misplacement structure is arranged on the linkage screw rod 6. The misplacement prevention structure includes an L-shaped movable plate 61, which is fixedly installed at one end of the linkage screw rod 6. The linkage screw rod 6 is threadedly installed on the inner wall of the sleeve shaft 5. A pressure block 62 is fixedly installed on one side of the L-shaped movable plate 61. The pressure block 62 contacts the concave inner wall of the framed SMT steel mesh 1. Two guide slide grooves 63 are provided on the inner wall of the positioning plate 45. Guide slide rods 6 are slidably installed in the two guide slide grooves 63. 4. Both guide slide bars 64 are fixedly mounted on one side of the L-shaped movable plate 61. An adjusting screw hole 65 is provided on the inner wall of the sleeve shaft 5. The linkage screw rod 6 is threadedly mounted in the adjusting screw hole 65. If the installation position of the framed SMT steel mesh 1 is opposite, the pressure block 62 will be squeezed on the plane of the framed SMT steel mesh 1 during the flipping process of the limit buckle 51, so that the limit buckle 51 cannot continue to flip and the limit buckle 51 cannot be completely closed, thereby avoiding the reverse installation of the framed SMT steel mesh 1. The remaining features are the same as those of Example 1.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An SMT steel mesh error-proofing and fool-proofing structure, comprising a framed SMT steel mesh (1) and a U-shaped mounting seat (2), wherein one side of the framed SMT steel mesh (1) is a concave surface; characterized in that: A plurality of mounting bolts (3) are movably mounted on the U-shaped mounting seat (2); a sliding frame (4) is slidably mounted on the inner wall of the U-shaped mounting seat (2); an adjustment structure is mounted on one side of the sliding frame (4); two sleeve shafts (5) are mounted on the adjustment structure; blocking structures are mounted on the two sleeve shafts (5); linkage screw rods (6) are mounted on the two blocking structures; and error-proofing structures are mounted on the two linkage screw rods (6); The adjustment structure comprises an adjustment frame (41), the adjustment frame (41) is rotatably mounted on one side of the sliding frame (4), a bidirectional screw rod (42) is rotatably mounted on the inner wall of the adjustment frame (41), a knob (43) is fixedly sleeved on the bidirectional screw rod (42), two adjustment sliders (44) are threadedly mounted on the bidirectional screw rod (42), the two adjustment sliders (44) are both slidably mounted on the inner wall of the adjustment frame (41), positioning plates (45) are fixedly mounted on the two adjustment sliders (44), and the two positioning plates (45) are both A guide rail groove (46) is provided, and the framed SMT steel mesh (1) is movably installed in the two guide rail grooves (46). Two L-shaped brackets (47) are symmetrically fixedly installed on one side of the adjustment frame (41). Adjustment screw rods (48) are rotatably installed on the two L-shaped brackets (47). One end of the two adjustment screw rods (48) is rotatably installed on one side of the adjustment frame (41). The same positioning strip (49) is threadedly installed on the two adjustment screw rods (48), and the two positioning plates (45) are slidably installed on the positioning strip (49). The blocking structure comprises a limit buckle (51), the limit buckle (51) is fixedly mounted on the sleeve shaft (5), the sleeve shaft (5) is rotatably mounted on the inner wall of the positioning plate (45), the limit buckle (51) contacts one side of the framed SMT steel mesh (1), a positioning bolt (52) is movably mounted on the limit buckle (51), a threaded hole (53) is opened on one side of the positioning plate (45), and the positioning bolt (52) is threadedly mounted in the threaded hole (53).

2. The SMT steel mesh error-proofing and fool-proofing structure according to claim 1, characterized in that: The error prevention structure comprises an L-shaped movable plate (61), the L-shaped movable plate (61) is fixedly mounted on one end of a linkage screw rod (6), the linkage screw rod (6) is threadedly mounted on the inner wall of the sleeve shaft (5), a pressing block (62) is fixedly mounted on one side of the L-shaped movable plate (61), and the pressing block (62) is in contact with the concave inner wall of the framed SMT steel mesh (1).

3. The SMT steel mesh error-proofing and fool-proofing structure according to claim 1, characterized in that: The inner wall of the positioning plate (45) is provided with two guide slots (63), and guide slide bars (64) are slidably installed in the two guide slots (63). The two guide slide bars (64) are fixedly installed on one side of the L-shaped movable plate (61).

4. The SMT steel mesh error-proofing and fool-proofing structure according to claim 1, characterized in that: An adjusting screw hole (65) is provided on the inner wall of the sleeve shaft (5), and the linkage screw rod (6) is threadedly installed in the adjusting screw hole (65).

5. The SMT steel mesh error-proofing and fool-proofing structure according to claim 1, characterized in that: The positioning bar (49) is provided with two movable holes (410), and the two positioning plates (45) are respectively slidably installed in the two movable holes (410). The inner wall of the adjusting slider (44) is provided with a threaded hole (411), and the bidirectional screw rod (42) is threadedly installed in the threaded hole (411).

6. The SMT steel mesh error-proofing and fool-proofing structure according to claim 1, characterized in that: The inner wall of the sliding frame (4) is provided with a limiting rotation groove (412), and a T-shaped rotating block (413) is fixedly installed on one side of the adjusting frame (41), and the T-shaped rotating block (413) is rotatably installed in the limiting rotation groove (412).

7. The SMT steel mesh error-proofing and fool-proofing structure according to claim 1, characterized in that: The inner walls of both sides of the U-shaped mounting seat (2) are provided with T-shaped guide grooves (414), and T-shaped sliders (415) are slidably installed in the two T-shaped guide grooves (414). The two T-shaped sliders (415) are respectively fixedly installed on both sides of the sliding frame (4), and two U-shaped guide rods (416) are fixedly installed on the adjustment frame (41), and the two U-shaped guide rods (416) are movably installed on the U-shaped mounting seat (2).

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