Circuit board cutting device

Abstract

The utility model relates to the technical field of circuit board processing, in particular to a circuit board cutting device. The automatic feeding device comprises a workbench, a cutting knife is arranged above the workbench, a feeding structure is arranged on one side of the workbench, and the feeding structure comprises a mounting frame; four rotating rollers are rotationally connected to the mounting frame through roller shafts; by arranging a rack, gears and a reciprocating lead screw, during feeding, the rack needs to be moved downwards in a small range, the two gears are driven by the rack to rotate in the opposite directions, a rotating roller is driven by the gears to rotate, a conveying belt is driven by the rotating roller to rotate, and a lifting plate is driven to move upwards at the same time through reverse rotation of the conveying belt; the lifting plate drives the circuit board to move upwards, then the mechanical arm drives the suction cup to move to the position above the circuit board, the circuit board is sucked through negative pressure adsorption, then the circuit board is transferred to the workbench, and the cutting knife is driven to cut the circuit board.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board processing, in particular to a circuit board cutting device. Background Art

[0002] Circuit boards are currently widely used in various fields and are an indispensable part of various devices. Circuit boards often carry various components to achieve circuit connectivity. The use of circuit boards can effectively increase the orderliness of component arrangement. Circuit boards need to be cut using cutting devices during processing.

[0003] A Chinese patent with announcement number CN219255681U discloses a circuit board cutting device, which includes: a supporting mechanism, including a bracket, etc., the bracket and the bottom plate are fixed by a first column and a second column; a moving and lifting combination mechanism, including a slide rail, etc., the slide rail and the first cylinder are installed on the top of the bracket, the slider is sleeved on the bracket and slidably connected with the slide rail; a cutting mechanism, including a mounting plate, etc., the two ends of the connecting rod are respectively connected to the top plate and the mounting plate, and the rotating motor and the cutting knife are connected by a rotating shaft; a clamping mechanism, including a first fixed block, etc., the first fixed block is provided with a threaded hole, and the threaded rod is threadedly connected to the first fixed block; the circuit board to be cut is placed on the bottom plate, the knob rotates the threaded rod, so that the threaded rod drives the clamping block to bring the circuit board close to the second fixed block, so that the circuit board is clamped by the second fixed block and the clamping block, avoiding shaking or prying of the plate during the cutting process, improving the cutting accuracy, and facilitating use.

[0004] In the above technology, during processing, the circuit boards to be cut need to be placed on the base plate one by one, and manual loading is used. Not only is the loading efficiency low and the labor intensity high, but the circuit boards are also thin, and there is a risk of scratching the hands. At the same time, working for a long time can easily cause sweating on the hands and soak the circuit boards, causing faults in the circuit boards.

[0005] Therefore, a circuit board cutting device is proposed to solve the above problems. Utility Model Content

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the problems in the prior art that it is inconvenient to quickly load the circuit board and there are safety hazards in loading the circuit board.

[0007] In order to solve the above technical problems, the utility model provides a circuit board cutting device.

[0008] In one embodiment of the utility model, it includes a workbench, a cutting knife is provided above the workbench, a feeding structure is provided on one side of the workbench, and the feeding structure includes a mounting frame; four rotating rollers are rotatably connected to the mounting frame through roller shafts, a conveyor belt is sleeved between two vertically aligned rotating rollers, and a lifting plate is fixedly connected to two adjacent side walls of the conveyor belt; one end of the two upper rotating rollers extends to the outside of the mounting frame and is fixedly connected to gears, and two sleeves are fixedly connected to the top of the mounting frame, and racks are provided in the sleeves, and the racks are meshed with gears; a manipulator is fixedly connected to the top of one end of the workbench close to the mounting frame, and two suction cups are installed at the output end of the manipulator, and the two suction cups are externally connected to an air pump.

[0009] In one embodiment of the utility model, two fixed plates are fixedly connected to the outer side walls of the mounting frame; a reciprocating screw is rotatably connected between the two fixed plates via a bearing, a first motor is fixedly connected to the bottom of the fixed plate, an output shaft of the first motor is fixedly connected to one end of the reciprocating screw, a movable plate is threadedly connected to the reciprocating screw, and the racks are respectively fixedly connected to the two side walls of the movable plate.

[0010] In one embodiment of the utility model, two guide rails are fixedly connected to the top of the workbench, and a sliding frame is slidably connected to the top of the two guide rails. A sliding block is slidably connected to the sliding frame via an electric slide rail, and an electric push rod is fixedly connected to the bottom of the sliding block. The cutting knife is fixedly connected to the output end of the electric push rod via a knife holder, and a cutting pad is pasted on the top center of the workbench.

[0011] In one embodiment of the utility model, two vertical plates are fixedly connected to the bottom of the workbench, a second motor is fixedly connected to one of the vertical plates, a bidirectional ball screw is rotatably connected between the two vertical plates via a bearing, an output shaft of the second motor is fixedly connected to one end of the bidirectional ball screw, two moving blocks are threadedly connected to the bidirectional ball screw, and the tops of the moving blocks are fixedly connected to limiting plates.

[0012] In one embodiment of the utility model, a first clamping plate is fixedly connected to the top of the workbench, and the first clamping plate is arranged on one side of the cutting pad. An L-shaped plate is fixedly connected to the workbench, and the L-shaped plate is arranged on the other side of the cutting pad. Two sliding rods are slidably connected to the L-shaped plate, and the two sliding rods are fixed with a second clamping plate at one end close to the cutting pad. Springs are sleeved on the outer sides of the sliding rods, and the two ends of the springs are respectively fixed to the L-shaped plate and the second clamping plate.

[0013] In one embodiment of the utility model, a third motor is fixedly connected to the top of the L-shaped plate, and the output shaft of the third motor is rotatably connected to the L-shaped plate through a bearing. The output shaft of the third motor is fixedly connected to an elliptical block, and the edge of the elliptical block is in contact with the second clamping plate.

[0014] In one embodiment of the utility model, two cross bars are fixedly connected between the two vertical plates, and the moving blocks are slidably connected on the two cross bars.

[0015] In an embodiment of the present invention, two guide rods are fixedly connected between the two fixed plates, and the movable plate slides on the two guide rods.

[0016] The above technical solution of the utility model has the following advantages compared with the prior art:

[0017] The utility model discloses a circuit board cutting device, by arranging a rack, a gear and a reciprocating screw rod, when loading materials, it is necessary to move the rack downward with a small amplitude, drive the two gears to rotate in opposite directions through the rack, drive the rotating roller to rotate through the gear, drive the conveyor belt to rotate through the rotating roller, and drive the lifting plate to move upward at the same time through the reverse rotation of the conveyor belt, the lifting plate drives the circuit board to move upward, and then the suction cup is driven by the manipulator to move to the top of the circuit board, the circuit board is sucked by negative pressure adsorption, and then the circuit board is transferred to the workbench, and the circuit board is cut by driving the cutting knife.

[0018] The circuit board cutting device described in the utility model is provided with a limit plate, a first clamping plate and a second clamping plate. When the circuit board is fixed horizontally, the second motor needs to be turned on, and the bidirectional ball screw is driven to rotate by the output shaft of the second motor, and the moving block is driven to move in opposite directions by the bidirectional ball screw, and the limit plate is driven to move in opposite directions by the moving block, so that the circuit board is fixed horizontally at the center position of the workbench; when the longitudinal position needs to be fixed, the third motor is turned on, and the elliptical block is driven to rotate by the third motor. When the elliptical block rotates until the edge of the major semi-axis contacts the second clamping plate, the second clamping plate can be driven to move in the direction of the first clamping plate, and the circuit board is fixed between the first clamping plate and the second clamping plate to fix the longitudinal position. After the cutting is completed, when it needs to be removed, when the elliptical block rotates until the edge of the minor semi-axis contacts the second clamping plate, the pressure on the second clamping plate can be released, and it moves in the direction away from the first clamping plate under the action of the spring, so as to remove the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below according to specific embodiments of the utility model in combination with the accompanying drawings.

[0020] Figure 1 It is a three-dimensional diagram of the utility model;

[0021] Figure 2 It is a partial stereogram of the utility model;

[0022] Figure 3 It is a three-dimensional diagram of the lifting plate in the utility model;

[0023] Figure 4 It is a three-dimensional diagram of the bottom of the workbench in the utility model;

[0024] Figure 5 It is a three-dimensional diagram of the moving block in the utility model;

[0025] Figure 6 It is a three-dimensional diagram of the cutting mat in the utility model;

[0026] Explanation of the reference numerals in the specification: 1. workbench; 11. cutting mat; 2. guide rail; 21. sliding frame; 22. sliding block; 23. electric push rod; 24. cutting knife; 3. manipulator; 31. suction cup; 4. mounting frame; 41. conveyor belt; 42. fixed plate; 43. first motor; 44. reciprocating screw; 45. guide rod; 46. moving plate; 47. gear; 48. rack; 49. sleeve; 410. lifting plate; 411. rotating roller; 5. vertical plate; 51. second motor; 52. moving block; 53. bidirectional ball screw; 54. cross bar; 55. limit plate; 6. first clamping plate; 61. second clamping plate; 62. L-shaped plate; 63. third motor; 64. elliptical block; 65. sliding rod; 66. spring. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] Reference Figure 1 - Figure 6 As shown, a circuit board cutting device of the utility model comprises a workbench 1, a cutting knife 24 is arranged above the workbench 1, a feeding structure is arranged on one side of the workbench 1, and the feeding structure comprises a mounting frame 4; four rotating rollers 411 are rotatably connected to the mounting frame 4 through roller shafts, a conveyor belt 41 is sleeved between two vertically aligned rotating rollers 411, and a lifting plate 410 is fixedly connected to two adjacent side walls of the conveyor belt 41; one end of the two upper rotating rollers 411 extends to the outside of the mounting frame 4 and is fixedly connected to a gear 47, two sleeves 49 are fixedly connected to the top of the mounting frame 4, racks 48 are arranged in the sleeves 49, and the racks 48 are meshed with the gears 47; a manipulator 3 is fixedly connected to the top of one end of the workbench 1 close to the mounting frame 4, and two suction cups 31 are installed at the output end of the manipulator 3, and the two suction cups 31 are externally connected to an air pump.

[0029] During operation, in order to solve the problem of fast loading of the circuit board to be cut, it is necessary to drive the rack 48 downward, drive the two gears 47 to rotate in opposite directions through the rack 48, drive the rotating roller 411 to rotate through the gear 47, drive the conveyor belt 41 to rotate through the rotating roller 411, and drive the lifting plate 410 to move upward at the same time through the reverse rotation of the conveyor belt 41. When the lifting plate 410 reaches a certain height, the circuit board can be placed on the lifting plate 410, and then the rack 48 is driven to move upward, and the lifting plate 410 is gradually moved downward, so that the circuit board is placed on the conveyor belt 41. and the mounting frame 4; when loading, it is necessary to move the rack 48 downward by a small amplitude, and the rack 48 drives the two gears 47 to rotate in opposite directions, and the rotating roller 411 is driven to rotate by the gear 47, and the conveyor belt 41 is driven to rotate by the rotating roller 411, and the conveyor belt 41 is driven to rotate by the reverse rotation of the conveyor belt 41 to drive the lifting plate 410 to move upward at the same time, and the lifting plate 410 drives the circuit board to move upward, and then the manipulator 3 drives the suction cup 31 to move to the top of the circuit board, and the circuit board is sucked by negative pressure adsorption, and then the circuit board is transferred to the workbench 1, and the circuit board is cut by driving the cutting knife 24.

[0030] Further, such as Figure 1 and Figure 2 As shown, two fixed plates 42 are fixedly connected to the outer wall of the mounting frame 4; a reciprocating screw 44 is rotatably connected between the two fixed plates 42 via a bearing, a first motor 43 is fixedly connected to the bottom of the fixed plate 42, an output shaft of the first motor 43 is fixedly connected to one end of the reciprocating screw 44, a movable plate 46 is threadedly connected to the reciprocating screw 44, and the rack 48 is respectively fixedly connected to the two side walls of the movable plate 46.

[0031] During operation, in order to drive the rack 48 to move up and down, it is necessary to turn on the first motor 43, and the reciprocating screw 44 is driven to rotate through the first motor 43, and the moving plate 46 is driven to reciprocate up and down through the reciprocating screw 44, and the rack 48 is driven to reciprocate up and down through the moving plate 46. The up and down reciprocating movement of the rack 48 is convenient for adjusting the lifting and lowering movement of the lifting plate 410, thereby facilitating material discharge and loading.

[0032] Further, such as Figure 1 As shown, two guide rails 2 are fixedly connected to the top of the workbench 1, and a sliding frame 21 is slidably connected to the top of the two guide rails 2. A sliding block 22 is slidably connected to the sliding frame 21 through an electric slide rail, and an electric push rod 23 is fixedly connected to the bottom of the sliding block 22. The cutting knife 24 is fixedly connected to the output end of the electric push rod 23 through a knife holder, and a cutting mat 11 is pasted on the top center of the workbench 1.

[0033] During operation, the lateral position of the cutting knife 24 can be adjusted conveniently by setting the guide rail 2, the longitudinal position of the cutting knife 24 can be adjusted conveniently by setting the electric slide bar 65, the height position of the cutting knife 24 can be adjusted conveniently by setting the electric push rod 23, and the position of the cutting knife 24 can be accurately controlled by inputting the cutting parameters in the computer program to improve the cutting accuracy, and the circuit board and the cutting knife 24 can be buffered conveniently by setting the cutting pad 11.

[0034] Further, such as Figure 4 and Figure 5 As shown, two vertical plates 5 are fixedly connected to the bottom of the workbench 1, a second motor 51 is fixedly connected to one of the vertical plates 5, a bidirectional ball screw 53 is rotatably connected between the two vertical plates 5 via a bearing, an output shaft of the second motor 51 is fixedly connected to one end of the bidirectional ball screw 53, two moving blocks 52 are threadedly connected to the bidirectional ball screw 53, and the tops of the moving blocks 52 are fixedly connected to limit plates 55.

[0035] During operation, when the suction cup 31 transfers the adsorbed circuit board to the top of the cutting pad 11, it can be loosened and dropped onto the cutting pad 11. When the circuit board needs to be fixed horizontally, the second motor 51 needs to be turned on, and the bidirectional ball screw 53 is driven to rotate by the output shaft of the second motor 51, and the moving block 52 is driven to move in the opposite direction by the bidirectional ball screw 53, and the limit plate 55 is driven to move in the opposite direction by the moving block 52, so that the circuit board is fixed horizontally at the center position of the workbench 1.

[0036] Further, such as Figure 6 As shown, a first clamping plate 6 is fixedly connected to the top of the workbench 1, and the first clamping plate 6 is arranged on one side of the cutting mat 11. An L-shaped plate 62 is fixedly connected to the workbench 1, and the L-shaped plate 62 is arranged on the other side of the cutting mat 11. Two sliding rods 65 are slidably connected to the L-shaped plate 62, and one end of the two sliding rods 65 close to the cutting mat 11 is fixedly connected to the second clamping plate 61, and the outer side of the sliding rod 65 is sleeved with a spring 66, and the two ends of the spring 66 are respectively fixed to the L-shaped plate 62 and the second clamping plate 61.

[0037] During operation, when the longitudinal position needs to be fixed, the second clamping plate 61 is driven to move in the direction of the first clamping plate 6, and the circuit board is fixed between the first clamping plate 6 and the second clamping plate 61 to fix the longitudinal position. After the cutting is completed, when it needs to be removed, the pressure on the second clamping plate 61 is released, and under the action of the spring 66, the second clamping plate 61 moves in the direction of the L-shaped plate 62, so as to facilitate the removal of the circuit board.

[0038] Further, such as Figure 6As shown, a third motor 63 is fixedly connected to the top of the L-shaped plate 62, and the output shaft of the third motor 63 is rotatably connected to the L-shaped plate 62 through a bearing. The output shaft of the third motor 63 is fixedly connected to an elliptical block 64, and the edge of the elliptical block 64 is in contact with the second clamping plate 61.

[0039] During operation, when driving the second clamping plate 61 to move, the third motor 63 needs to be turned on, and the elliptical block 64 is driven to rotate by the third motor 63. When the elliptical block 64 rotates until the edge of the major semi-axis contacts the second clamping plate 61, the second clamping plate 61 can be driven to move toward the first clamping plate 6, thereby fixing the circuit board; when the elliptical block 64 rotates until the edge of the minor semi-axis contacts the second clamping plate 61, the pressure on the second clamping plate 61 can be released, and under the action of the spring 66, it moves away from the first clamping plate 6, thereby removing the circuit board.

[0040] Further, such as Figure 5 As shown, two cross bars 54 are fixedly connected between the two vertical plates 5 , and the moving blocks 52 are slidably connected on the two cross bars 54 .

[0041] During operation, the moving block 52 slides on the cross bar 54 during the movement, and the cross bar 54 limits the moving block 52 in the horizontal direction.

[0042] Further, such as Figure 2 As shown, two guide rods 45 are fixedly connected between the two fixed plates 42 , and the movable plate 46 slides on the two guide rods 45 .

[0043] During operation, the movable plate 46 slides on the guide rod 45 during the movement, and the guide rod 45 limits the movable plate 46 in the vertical direction.

[0044] Working principle: In order to solve the problem of fast feeding of circuit boards that are inconvenient to be cut, it is necessary to turn on the first motor 43, and drive the reciprocating screw rod 44 to rotate through the first motor 43, and drive the moving plate 46 to reciprocate up and down through the reciprocating screw rod 44, and drive the rack 48 to reciprocate up and down through the moving plate 46. When placing the circuit board, it is necessary to drive the rack 48 downward, and drive the two gears 47 to rotate in opposite directions through the rack 48, and drive the rotating roller 411 to rotate through the gear 47, and drive the conveyor belt 41 to rotate through the rotating roller 411, and drive the lifting plate 410 to move upward at the same time through the reverse rotation of the conveyor belt 41. When the lifting plate 410 reaches a certain height, the circuit board can be placed on the lifting plate 410, and then The driven rack 48 moves upward, and the lifting plate 410 moves downward step by step, so that the circuit board is placed in the conveyor belt 41 and the mounting frame 4; when loading, the rack 48 needs to be moved downward slightly, and the two gears 47 are driven to rotate in opposite directions by the rack 48, and the rotating roller 411 is driven to rotate by the gear 47, and the conveyor belt 41 is driven to rotate by the rotating roller 411, and the lifting plate 410 is driven to move upward at the same time by the reverse rotation of the conveyor belt 41, and the lifting plate 410 drives the circuit board to move upward, and then the suction cup 31 is driven by the manipulator 3 to move to the top of the circuit board, and the circuit board is sucked by negative pressure adsorption, and then the circuit board is transferred to the workbench 1, and the circuit board is cut by driving the cutting knife 24;

[0045] When the circuit board is to be fixed horizontally, the second motor 51 needs to be turned on, and the bidirectional ball screw 53 is driven to rotate by the output shaft of the second motor 51, and the moving block 52 is driven to move in the opposite direction by the bidirectional ball screw 53, and the limit plate 55 is driven to move in the opposite direction by the moving block 52, so that the circuit board is fixed horizontally at the center position of the workbench 1; when the longitudinal position needs to be fixed, the third motor 63 is turned on, and the elliptical block 64 is driven to rotate by the third motor 63. When the elliptical block 64 rotates until the edge of the major semi-axis contacts the second clamping plate 61, the second clamping plate 61 can be driven to move in the direction of the first clamping plate 6, and the circuit board is fixed between the first clamping plate 6 and the second clamping plate 61 to fix the longitudinal position. After the cutting is completed, when it needs to be removed, when the elliptical block 64 rotates until the edge of the minor semi-axis contacts the second clamping plate 61, the pressure on the second clamping plate 61 can be released, and it moves in the direction away from the first clamping plate 6 under the action of the spring 66, so as to remove the circuit board;

[0046] By setting the guide rail 2, it is convenient to adjust the lateral position of the cutting knife 24, by setting the electric slide bar 65, it is convenient to adjust the longitudinal position of the cutting knife 24, by setting the electric push rod 23, it is convenient to adjust the height position of the cutting knife 24, by inputting the cutting parameters in the computer program, it is convenient to accurately control the position of the cutting knife 24 and improve the cutting accuracy, and by setting the cutting pad 11, it is convenient to buffer the circuit board and the cutting knife 24.

[0047] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the scope of protection of the invention of the utility model.

Claims

1. A circuit board cutting device, comprising a workbench (1), a cutting knife (24) is provided above the workbench (1), and a feeding structure is provided on one side of the workbench (1), characterized in that: The feeding structure comprises a mounting frame (4); four rotating rollers (411) are rotatably connected to the mounting frame (4) via roller shafts; a conveyor belt (41) is sleeved between two vertically aligned rotating rollers (411); and a lifting plate (410) is fixedly connected to two adjacent side walls of the conveyor belt (41); one end of the two upper rotating rollers (411) extends to the outside of the mounting frame (4) and is fixedly connected to a gear (47); two sleeves (49) are fixedly connected to the top of the mounting frame (4); racks (48) are provided in the sleeves (49), and the racks (48) are meshed with the gears (47); a manipulator (3) is fixedly connected to the top of one end of the workbench (1) close to the mounting frame (4); two suction cups (31) are installed at the output end of the manipulator (3), and the two suction cups (31) are externally connected to an air pump.

2. A circuit board cutting device according to claim 1, characterized in that: Two fixed plates (42) are fixedly connected to the outer side wall of the mounting frame (4); a reciprocating screw rod (44) is rotatably connected between the two fixed plates (42) via a bearing; a first motor (43) is fixedly connected to the bottom of the fixed plate (42); an output shaft of the first motor (43) is fixedly connected to one end of the reciprocating screw rod (44); a movable plate (46) is threadedly connected to the reciprocating screw rod (44); and the rack (48) is respectively fixedly connected to two side walls of the movable plate (46).

3. A circuit board cutting device according to claim 2, characterized in that: The top of the workbench (1) is fixedly connected to two guide rails (2), the tops of the two guide rails (2) are slidably connected to a sliding frame (21), the sliding frame (21) is slidably connected to a sliding block (22) via an electric slide rail, the bottom of the sliding block (22) is fixedly connected to an electric push rod (23), the cutting knife (24) is fixedly connected to the output end of the electric push rod (23) via a knife seat, and a cutting mat (11) is pasted to the center of the top of the workbench (1).

4. A circuit board cutting device according to claim 3, characterized in that: Two vertical plates (5) are fixedly connected to the bottom of the workbench (1), a second motor (51) is fixedly connected to one of the vertical plates (5), a bidirectional ball screw (53) is rotatably connected between the two vertical plates (5) via a bearing, an output shaft of the second motor (51) is fixedly connected to one end of the bidirectional ball screw (53), two moving blocks (52) are threadedly connected to the bidirectional ball screw (53), and the tops of the moving blocks (52) are both fixedly connected to a limiting plate (55).

5. A circuit board cutting device according to claim 4, characterized in that: A first clamping plate (6) is fixedly connected to the top of the workbench (1), and the first clamping plate (6) is arranged on one side of the cutting mat (11). An L-shaped plate (62) is fixedly connected to the workbench (1), and the L-shaped plate (62) is arranged on the other side of the cutting mat (11). Two sliding rods (65) are slidably connected to the L-shaped plate (62), and one end of the two sliding rods (65) close to the cutting mat (11) is fixedly connected to the second clamping plate (61). The outer sides of the sliding rods (65) are both sleeved with springs (66), and the two ends of the springs (66) are respectively fixedly connected to the L-shaped plate (62) and the second clamping plate (61).

6. A circuit board cutting device according to claim 5, characterized in that: A third motor (63) is fixedly connected to the top of the L-shaped plate (62), and an output shaft of the third motor (63) is rotatably connected to the L-shaped plate (62) via a bearing. An elliptical block (64) is fixedly connected to the output shaft of the third motor (63), and an edge of the elliptical block (64) is in contact with the second clamping plate (61).

7. A circuit board cutting device according to claim 6, characterized in that: Two cross bars (54) are fixedly connected between the two vertical plates (5), and the moving blocks (52) are slidably connected on the two cross bars (54).

8. A circuit board cutting device according to claim 7, characterized in that: Two guide rods (45) are fixedly connected between the two fixed plates (42), and the movable plate (46) slides on the two guide rods (45).

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