Clamping assembly of flexible printed circuit board

Abstract

The invention discloses a clamping assembly of a flexible printed circuit board, and relates to the technical field of integrated circuit manufacturing. The box body assembly comprises a mounting box; a first sliding rail and a second sliding rail are mounted at the two ends of the mounting box; the first sliding rail and the second clamping assembly are movably installed. The second sliding rail and the first clamping assembly are installed in a matched mode. The first clamping assembly comprises a first negative pressure head; the first negative pressure head is fixedly mounted at the bottom of the lifting frame through an air pipe; the first toothed plate and the lifting frame are fixedly mounted; the first toothed plate is meshed with the ratchet wheel assembly; an electric push cylinder fixedly installed at the top of a fixing frame drives a lifting frame to move downwards, a first negative pressure head at the bottom is in negative pressure adsorption with one end of a circuit board, the electric push cylinder drives a first clamping assembly and one end of the circuit board to move upwards, and a first toothed plate at one end of the lifting frame drives a ratchet gear to rotate; and the ratchet gear drives the second gear through the connecting shaft to drive the moving rod.

Description

Technical Field

[0001] The present invention relates specifically to the technical field of integrated circuit manufacturing, in particular to a clamping assembly for a flexible printed circuit board. Background Art

[0002] A flexible printed circuit board (FPC) is a patterned printed circuit board made from a flexible substrate. It consists of an insulating substrate and a conductive layer, optionally with an adhesive between them. It can be bent, curled, or folded at will, making it suitable for designs requiring compact space or irregular shapes. It can be moved and expanded in three dimensions, integrating component assembly with wire connections. Due to its thin substrate and light overall weight, it meets the demands of modern electronic products for miniaturization and portability. It also features tight connections and excellent vibration resistance, making it more durable in high-vibration and mobile environments, and better and more effectively absorbing vibration and shock. Traditional clamping assemblies often suffer from poor structural design, leading to uneven pressure distribution between the FPC and the clamping components. For example, single-point or localized force on the clip can cause the FPC edge to warp or slight displacement under vibration, resulting in poor circuit contact, signal interruption, or increased resistance. Furthermore, when traditional clamping assemblies are clamping flexible printed circuits, the circuit boards can bend due to temperature fluctuations, which cannot effectively guarantee printing quality. Traditional clamping devices typically use rigid structures to contact the circuit boards, which can easily cause the circuit boards to be crushed if too tight or fall off if too loose, failing to effectively guarantee the quality of the circuit boards themselves and their stability during processing. After searching, Chinese patent application number CN202110629474.2 discloses a clamping tool for cutting flexible circuit boards; comprising: a transmission belt, the transmission belt comprising a bottom plate, side plates and a top plate, the bottom plate, side plates and top plate surrounding each other to form a groove, the groove having an embedded groove extending into the side plates; a connecting plate provided in the groove, the embedded groove provided with a pressure plate; a clamping assembly, the clamping assembly comprising a support block and a lower pressure piece, the lower pressure piece being provided on the support block, and the support block being engaged with the top plate; Although the device in the above patent can effectively achieve the clamping effect on the flexible printed circuit board, when the lower pressure piece contacts the circuit board, wrinkles may appear on the surface of the circuit board. This may cause damage to the circuit board during processing of the circuit board, and the transmission effect cannot be effectively guaranteed, affecting the quality of the circuit board. Summary of the Invention

[0003] The object of the present invention is to provide a clamping assembly for a flexible printed circuit board. In this device, the adsorption effect of one end of the flexible printed circuit board is first achieved by the first clamping assembly. During the upward movement of the first clamping assembly, the cooperation between the ratchet assembly and the driving assembly is realized to move the spreading plate fixedly installed at the end of the movable rod forward, so that the spreading plate moves to the bottom of the circuit board. The winding wheel is rotated by the driving motor, and the slide is slid along the support rod, thereby effectively realizing the movement of the spreading plate along the bottom of the circuit board, thereby effectively flattening the flexible printed circuit board and avoiding wrinkles on the surface of the circuit board. During the movement of the spreading plate, the connecting belt realizes the synchronous rotation of the first pulley and the first gear. Through the cooperation between the first gear and the second clamping assembly, the second negative pressure head in the second clamping assembly is moved downward to achieve effective adsorption and clamping of the other end of the flexible printed circuit board. When the wedge block on the movable rod contacts the stop block, the movable rod drives the spreading plate to move backward, avoiding interference caused by the spreading plate during circuit board processing; so as to solve the problems of the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: The cam is secured to the chassis and has a first end for securing the chassis to the second end of the second support frame, the second end for securing the chassis to the chassis, and the second end for securing the chassis to the chassis. The ratchet assembly includes a ratchet gear; the ratchet gear is coaxially arranged with a second gear through a connecting shaft; one end of the connecting shaft is movably installed with the side plate of the mounting box through a bearing; the bottom of the second gear is cooperatively connected with the driving assembly; the driving assembly includes a moving rod; the cross-section of the moving rod is U-shaped; one end of the moving rod is fixedly installed with a spreading plate; the cross-section of the spreading plate is C-shaped, so that when the circuit board is flattened, it can ensure that the bottom plate surface of the circuit board is in contact with the circuit board, thereby ensuring the flattening effect of the spreading plate.

[0005] As a further technical solution of the present invention, teeth are integrally provided on the plane at the top of the moving rod, and the teeth are meshed and connected with the second gear; the bottom of the moving rod is slidably installed with the skateboard through a seat bearing; the surface of the moving rod and the inside of the seat bearing are movably installed through a spline shaft, and through the rotation of the second gear, the moving rod drives the unfolding plate to move forward, thereby achieving the flattening effect of the circuit board.

[0006] As a further technical solution of the present invention, the two ends of the bottom of the skateboard are slidably connected to the support rod; the two ends of the support rod are fixedly installed on the inner wall of the installation box; the support rod is also provided with a spring, which is squeezed when the skateboard moves, and is reset by extending the spring when resetting.

[0007] As a further technical solution of the present invention, a double-round-headed groove is further provided on the side wall of the installation box for facilitating the passage of one end of the movable rod; a stop block is provided at one end of the double-round-headed groove; the stop block is fixedly mounted on the inner wall of the installation box, and the contact between the stop block and the wedge block on the movable rod is realized to realize the movement of the movable rod to drive the expansion plate backward, thereby realizing the separation between the expansion plate and the circuit board, and avoiding the interference of the expansion plate during the processing of the circuit board.

[0008] As a further technical solution of the present invention, a wedge-shaped block cooperating with the stop block is fixedly mounted on the moving rod; and the surfaces where the stop block and the wedge-shaped block meet are both inclined surfaces.

[0009] As a further technical solution of the present invention, a first pulley is movably mounted on the movable rod; the first pulley is movably mounted on the movable rod via a torsion spring; and a connecting belt is fixedly mounted on the first pulley.

[0010] As a further technical solution of the present invention, the drive assembly also includes a second pulley; the second pulley and the first pulley are on the same plane; the second pulley is coaxially provided with a first gear through a rotating shaft; the first gear is arranged on the outside of the mounting box; the first gear is cooperatively connected with the second clamping assembly; the rotating shaft is movably mounted on the side wall of the mounting box through a bearing.

[0011] As a further technical solution of the present invention, a drive motor is provided on the top of the rotating shaft; the drive motor is fixedly installed on the inner wall of the mounting box through a reinforcing plate; a winding wheel is fixedly installed on the output shaft of the drive motor; the winding wheel is fixedly installed on the end of the connecting belt away from the first pulley.

[0012] As a further technical solution of the present invention, the second clamping assembly includes two second damping sliders slidably connected to the first slide rail; the two second damping sliders are fixedly installed on the lifting plate; a second negative pressure head is fixedly installed on the bottom of the lifting plate through an air pipe; a second gear plate is also arranged between the two second damping sliders; the second gear plate is meshed with the first gear.

[0013] As a further technical solution of the present invention, the box assembly is fixedly installed inside the fixing frame; wherein, an electric push cylinder is also fixedly installed on the top of one end; the push rod of the electric push cylinder is fixedly installed on the lifting frame.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. When in use, the present invention first moves the fixing frame to the top of the flexible printed circuit board through the moving assembly, and the electric push cylinder fixedly installed on the top of the fixing frame drives the lifting frame to move downward through the cooperation between the first slider and the second slide rail. During the process of the lifting frame descending, the first negative pressure head at the bottom and one end of the circuit board are negatively adsorbed by the electric push cylinder, and then the first clamping assembly and one end of the circuit board are driven upward by the electric push cylinder. At this time, the first tooth plate at one end of the lifting frame drives the ratchet gear to rotate, so that the ratchet gear drives the second gear through the connecting shaft to drive the moving rod; 2. In the present invention, when the second gear meshes with the teeth on the top of the moving rod, the moving rod moves forward, and the end of the moving rod drives the spreading plate to move to the bottom of the circuit board. At this time, the first clamping assembly stops rising, and then the drive motor drives the winding wheel to rotate, so that the winding wheel pulls the connecting belt. At this time, the second pulley at the other end of the connecting belt drives the moving rod to realize that the slide plate moves along the support rod toward the end away from the ratchet assembly, thereby effectively realizing that the spreading plate moves along the bottom edge of the circuit board, realizing effective flattening of the circuit board, and avoiding wrinkles on the surface of the circuit board during processing; When the second gear is engaged with the second gear, the second gear is engaged with the second gear on the end of the lifting plate, so that the second gear drives the lifting plate to move downward along the first slide rail. When the second damping slider slides with the first slide rail, it has a certain damping effect, which effectively stabilizes the lifting plate when it is lifted up. During the downward movement of the lifting plate (51), the second negative pressure head moves to a position flush with the first negative pressure head. As the moving rod drives the movement of the expansion plate, when the other end of the circuit board contacts the second negative pressure head, the wedge block on the moving rod contacts the stop block at the end of the double round head groove, and the stop block effectively stops the expansion plate, so that the moving rod drives the expansion plate to retract backward. This effectively avoids the situation where the expansion plate interferes with the processing during the clamping processing of the circuit board, thereby effectively ensuring the quality of the circuit board processing. 4. In the present invention, after the unfolding plate is reset, the driving motor stops rotating. At this time, the spring on the support rod is reset, thereby driving the slide plate to move along the support rod toward the end away from the driving motor. At this time, the torsion spring inside the first pulley is reset synchronously, thereby pulling the connecting belt, and the winding wheel is unwound for the next use. After the first clamping assembly and the second clamping assembly complete the clamping of the circuit board, the moving assembly is used to realize the overall movement of the clamping assembly, thereby transferring the clamped circuit board to the processing position. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0016] Figure 2 In the present invention Figure 1 Another perspective structural diagram.

[0017] Figure 3 In the present invention Figure 1 Schematic diagram of the splitting.

[0018] Figure 4 In the present invention Figure 3 Schematic diagram of the local structure.

[0019] Figure 5 In the present invention Figure 3 Schematic diagram of the structure of the first clamping component from another perspective.

[0020] Figure 6 In the present invention Figure 3 Schematic diagram of the structure of the second clamping component from another perspective.

[0021] Figure 7 In the present invention Figure 4 Schematic diagram of the internal structure assembly of the installation box.

[0022] Figure 8 In the present invention Figure 7 Assembly diagram of the middle drive assembly and ratchet assembly.

[0023] Figure 9 In the present invention Figure 8 Schematic diagram of the bottom structure.

[0024] Figure 10 In the present invention Figure 1 A magnified view of the local structure at point A.

[0025] Figure 11 In the present invention Figure 1 Enlarged view of the local structure at point B in the middle.

[0026] Figure 12 This invention Figure 7 Enlarged view of the local structure at point C in the middle.

[0027] Figure 13 In the present invention Figure 9 Enlarged view of the local structure at point D in the middle.

[0028] In the figure: 1-fixed frame, 2-box assembly, 20-installation box, 21-double round head groove, 22-first slide rail, 23-second slide rail, 24-stopper, 3-electric push cylinder, 4-first clamping assembly, 40-first negative pressure head, 41-lifting frame, 42-first tooth plate, 43-first slider, 5-second clamping assembly, 50-second negative pressure head, 51-lifting plate, 52-second tooth plate, 53-second damping slider, 6-drive assembly, 60-first gear, 61-rotating shaft, 62-second pulley, 63-drive motor, 64-winding wheel, 65-connecting belt, 66-spring, 67-support rod, 68-moving rod, 69-first pulley, 610-slide plate, 611-wedge block, 612-teeth, 7-expanding plate, 8-ratchet assembly, 80-ratchet gear, 81-second gear, 82-connecting shaft. DETAILED DESCRIPTION

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

[0030] See also Figure 1-8 In an embodiment of the present invention, a clamping assembly for a flexible printed circuit board includes a box assembly 2; the box assembly 2 includes an installation box 20; both ends of the side wall of one side of the installation box 20 are fixedly installed with a first slide rail 22 and a second slide rail 23; wherein, the first slide rail 22 is movably installed with the second clamping assembly 5; the second slide rail 23 is installed in cooperation with the first clamping assembly 4; wherein, the first clamping assembly 4 includes a first negative pressure head 40; the first negative pressure head 40 is fixedly installed at the bottom of the lifting frame 41 through an air pipe; one end of the lifting frame 41 is slidably installed with the second slide rail 23 through a first slider 43; a first tooth plate 42 is provided between the two first sliders 43; the first tooth plate 42 is fixedly installed with the lifting frame 41; the first tooth plate 42 is meshed with the ratchet assembly 8; The ratchet assembly 8 includes a ratchet gear 80; the ratchet gear 80 is coaxially provided with a second gear 81 via a connecting shaft 82; one end of the connecting shaft 82 is movably mounted to the side plate of the mounting box 20 via a bearing; the bottom of the second gear 81 is cooperatively connected to the drive assembly 6; the drive assembly 6 includes a moving rod 68; the cross-section of the moving rod 68 is U-shaped; one end of the moving rod 68 is fixedly mounted with an expansion plate 7; the cross-section of the expansion plate 7 is C-shaped; The top surface of the movable rod 68 is integrally provided with teeth 612, which mesh with the second gear 81. The bottom of the movable rod 68 is slidably mounted on the slide 610 via a seat bearing. The surface of the movable rod 68 and the interior of the seat bearing are movably mounted via a spline shaft. By adopting the above technical solution, when in use, the fixing frame 1 is first moved to the top of the flexible printed circuit board through the moving component, and the electric push cylinder 3 fixedly installed on the top of the fixing frame 1 drives the lifting frame 41 to move downward through the cooperation between the first slider 43 and the second slide rail 23. In the process of the lifting frame 41 descending, the first negative pressure head 40 at the bottom is negatively adsorbed with one end of the circuit board, and then the first clamping assembly 4 and one end of the circuit board are driven to move upward by the electric push cylinder 3. At this time, the first tooth plate 42 at one end of the lifting frame 41 drives the ratchet gear 80 to rotate, so that the ratchet gear 80 drives the second gear 81 through the connecting shaft 82 to drive the moving rod 68.

[0031] See also Figure 7-13 In this embodiment, the two ends of the bottom of the slide 610 are slidably connected to the support rod 67; the two ends of the support rod 67 are fixedly installed with the inner wall of the installation box 20; the support rod 67 is also provided with a spring 66; In this embodiment, the side wall of the installation box 20 is further provided with a double round head groove 21 for one end of the movable rod 68 to pass through; a stopper 24 is provided at one end of the double round head groove 21; the stopper 24 is fixedly mounted to the inner wall of the installation box 20; By adopting the above technical solution, when the second gear 81 engages with the teeth 612 at the top of the moving rod 68, the moving rod 68 moves forward, and the end of the moving rod 68 drives the spreading plate 7 to move to the bottom of the circuit board. At this time, the first clamping assembly 4 stops rising, and then drives the winding wheel 64 to rotate through the driving motor 63, so that the winding wheel 64 pulls the connecting belt 65. At this time, the second pulley 62 at the other end of the connecting belt 65 drives the moving rod 68 to realize the movement of the slide plate 610 along the support rod 67 to the end away from the ratchet assembly 8, thereby effectively realizing the movement of the spreading plate 7 along the bottom edge of the circuit board, realizing the effective flattening of the circuit board, and avoiding the presence of wrinkles on the surface of the circuit board during processing.

[0032] See also Figure 2-13Furthermore, a wedge block 611 that cooperates with the stop block 24 is fixedly mounted on the moving rod 68; the surfaces where the stop block 24 and the wedge block 611 meet are both inclined surfaces; In this embodiment, a first pulley 69 is movably mounted on the movable rod 68; the first pulley 69 is movably mounted on the movable rod 68 via a torsion spring; a connecting belt 65 is fixedly mounted on the first pulley 69; By adopting the above technical solution, during the winding process of the winding wheel 64, when the connecting belt 65 passes through the second pulley 62, the second pulley 62 drives the first gear 60 to rotate synchronously through the rotating shaft 61, and the first gear 60 is engaged with the second tooth plate 52 at the end of the lifting plate 51, so that the second tooth plate 52 drives the lifting plate 51 to move downward along the first slide rail 22. When the second damping slider 53 slides with the first slide rail 22, it has a certain damping effect, which effectively stabilizes the lifting plate 51 when it is lifted and lowered. During the descent of the lifting plate 51, the second negative pressure head 50 moves to a position flush with the first negative pressure head 40.

[0033] See also Figure 7-13 In this embodiment, the driving assembly 6 further includes a second pulley 62; the second pulley 62 and the first pulley 69 are on the same plane; the second pulley 62 is coaxially provided with a first gear 60 through a rotating shaft 61; the first gear 60 is provided on the outside of the mounting box 20; the first gear 60 is cooperatively connected with the second clamping assembly 5; the rotating shaft 61 is movably installed with the side wall of the mounting box 20 through a bearing; A drive motor 63 is provided on the top of the rotating shaft 61; the drive motor 63 is fixedly mounted to the inner wall of the mounting box 20 via a reinforcing plate; a reel 64 is fixedly mounted on the output shaft of the drive motor 63; the reel 64 is fixedly mounted to the end of the connecting belt 65 away from the first pulley 69; By adopting the above technical solution, as the moving rod 68 drives the expansion plate 7 to move, when the other end of the circuit board contacts the second negative pressure head 50, the wedge block 611 on the moving rod 68 contacts the stop block 24 at the end of the double round head groove 21. The stop block 24 effectively stops and enables the moving rod 68 to drive the expansion plate 7 to retract backward. This effectively avoids the situation where the expansion plate 7 interferes with the processing when the circuit board is clamped, thereby effectively ensuring the quality of the circuit board processing.

[0034] See also Figure 1-6In this embodiment, the second clamping assembly 5 includes two second damping sliders 53 slidably connected to the first slide rail 22; the two second damping sliders 53 are fixedly installed on the lifting plate 51; a second negative pressure head 50 is fixedly installed on the bottom of the lifting plate 51 through an air pipe; a second tooth plate 52 is further provided between the two second damping sliders 53; the second tooth plate 52 is meshed with the first gear 60; The box assembly 2 is fixedly mounted inside the fixing frame 1; wherein, an electric push cylinder 3 is also fixedly mounted on the top of one end; the push rod of the electric push cylinder 3 is fixedly mounted on the lifting frame 41; By adopting the above technical solution, after the unfolding plate 7 is reset, the drive motor 63 stops rotating. At this time, the spring 66 on the support rod 67 is reset, and the slide plate 610 is driven to move along the support rod 67 toward the end away from the drive motor 63. At this time, the torsion spring inside the first pulley 69 is reset synchronously, and the connecting belt 65 is pulled, and the winding wheel 64 is unwound for the next use. After the first clamping assembly 4 and the second clamping assembly 5 complete the clamping of the circuit board, the entire clamping assembly is moved by the moving assembly to transfer the clamped circuit board to the processing position.

[0035] The working principle of the present invention is as follows: when in use, the fixing frame 1 is first moved to the top of the flexible printed circuit board through the moving assembly, and the electric push cylinder 3 fixedly installed on the top of the fixing frame 1 drives the lifting frame 41 to move downward through the cooperation between the first slider 43 and the second slide rail 23. During the descent of the lifting frame 41, the first negative pressure head 40 at the bottom is negatively adsorbed with one end of the circuit board by negative pressure, and then the electric push cylinder 3 drives the first clamping assembly 4 and one end of the circuit board to move upward. At this time, the first tooth plate 42 at one end of the lifting frame 41 drives the ratchet gear 80 to rotate, so that the ratchet gear 80 drives the second gear 81 through the connecting shaft 82 to drive the moving rod 68; When the second gear 81 meshes with the teeth 612 at the top of the moving rod 68, the moving rod 68 moves forward, and the end of the moving rod 68 drives the spreading plate 7 to move to the bottom of the circuit board. At this time, the first clamping assembly 4 stops rising, and then the drive motor 63 drives the winding wheel 64 to rotate, so that the winding wheel 64 pulls the connecting belt 65. At this time, the second pulley 62 at the other end of the connecting belt 65 drives the moving rod 68 to realize the sliding plate 610 moving along the support rod 67 to the end away from the ratchet assembly 8, thereby effectively realizing the movement of the spreading plate 7 along the bottom edge of the circuit board, realizing the effective flattening of the circuit board, and avoiding the occurrence of wrinkles on the circuit board surface during processing; When the winding wheel 64 is winding, when the connecting belt 65 passes the second pulley 62, the second pulley 62 drives the first gear 60 to rotate synchronously through the rotating shaft 61, and the first gear 60 is engaged with the second tooth plate 52 at the end of the lifting plate 51, so that the second tooth plate 52 drives the lifting plate 51 to move downward along the first slide rail 22. When the second damping slider 53 slides with the first slide rail 22, it has a certain damping effect, which effectively stabilizes the lifting plate 51 when it is raised and lowered. During the descending process of the lifting plate 51, the second negative pressure head 50 moves to a position flush with the first negative pressure head 40; As the moving rod 68 drives the spreading plate 7 to move, when the other end of the circuit board contacts the second negative pressure head 50, the wedge block 611 on the moving rod 68 contacts the stopper 24 at the end of the double round head groove 21. The stopper 24 effectively stops the moving rod 68 and drives the spreading plate 7 to retract backward. This effectively prevents the spreading plate 7 from interfering with the processing during the clamping process of the circuit board, thereby effectively ensuring the quality of the circuit board processing. After the unfolding plate 7 is reset, the drive motor 63 stops rotating. At this time, the spring 66 on the support rod 67 is reset, driving the slide plate 610 to move along the support rod 67 toward the end away from the drive motor 63. At this time, the torsion spring inside the first pulley 69 is reset synchronously, pulling the connecting belt 65, and the winding wheel 64 is unwound for the next use. After the first clamping assembly 4 and the second clamping assembly 5 complete the clamping of the circuit board, the entire clamping assembly is moved by the moving assembly to transfer the clamped circuit board to the processing position.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A clamping assembly for a flexible printed circuit board, characterized in that: It comprises a box assembly (2); the box assembly (2) comprises an installation box (20); a first slide rail (22) and a second slide rail (23) are fixedly mounted on both ends of a side wall of the installation box (20); wherein the first slide rail (22) and the second clamping assembly (5) are movably mounted; the second slide rail (23) and the first clamping assembly (4) are cooperatively mounted; wherein; The first clamping assembly (4) includes a first negative pressure head (40); the first negative pressure head (40) is fixedly mounted on the bottom of the lifting frame (41) through an air pipe; one end of the lifting frame (41) is slidably mounted on the second slide rail (23) through a first slider (43); a first tooth plate (42) is provided between the two first sliders (43); the first tooth plate (42) is fixedly mounted on the lifting frame (41); the first tooth plate (42) is meshedly connected to the ratchet assembly (8); The ratchet assembly (8) includes a ratchet gear (80); the ratchet gear (80) is coaxially provided with a second gear (81) via a connecting shaft (82); one end of the connecting shaft (82) is movably mounted on a side plate of the mounting box (20) via a bearing; the bottom of the second gear (81) is cooperatively connected with the driving assembly (6); the driving assembly (6) includes a moving rod (68); the cross section of the moving rod (68) is U-shaped; an expansion plate (7) is fixedly mounted on one end of the moving rod (68); the cross section of the expansion plate (7) is C-shaped.

2. The clamping assembly for a flexible printed circuit board according to claim 1, characterized in that: The plane on the top of the moving rod (68) is integrally provided with teeth (612), and the teeth (612) are meshed and connected with the second gear (81); the bottom of the moving rod (68) is slidably mounted on the slide plate (610) through a seat bearing; the surface of the moving rod (68) and the inside of the seat bearing are movably mounted through a spline shaft.

3. The clamping assembly for a flexible printed circuit board according to claim 2, wherein: The two ends of the bottom of the slide plate (610) are slidably connected to the support rod (67); the two ends of the support rod (67) are fixedly mounted on the inner wall of the installation box (20); and a spring (66) is also sleeved on the support rod (67).

4. The clamping assembly for a flexible printed circuit board according to claim 3, wherein: The side wall of the installation box (20) is also provided with a double round head groove (21) for one end of the movable rod (68) to pass through; a stopper (24) is provided at one end of the double round head groove (21); the stopper (24) is fixedly mounted on the inner wall of the installation box (20).

5. The clamping assembly for a flexible printed circuit board according to claim 4, characterized in that: A wedge-shaped block (611) that cooperates with the stop block (24) is fixedly mounted on the moving rod (68); the surfaces where the stop block (24) and the wedge-shaped block (611) meet are both inclined surfaces.

6. The flexible printed circuit board clamping assembly according to claim 5, characterized in that: A first pulley (69) is also movably mounted on the movable rod (68); the first pulley (69) is movably mounted on the movable rod (68) via a torsion spring; and a connecting belt (65) is fixedly mounted on the first pulley (69).

7. The flexible printed circuit board clamping assembly according to claim 4, characterized in that: The driving assembly (6) further includes a second pulley (62); the second pulley (62) and the first pulley (69) are on the same plane; the second pulley (62) is coaxially provided with a first gear (60) via a rotating shaft (61); the first gear (60) is provided on the outside of the mounting box (20); the first gear (60) is cooperatively connected with the second clamping assembly (5); the rotating shaft (61) is movably mounted on the side wall of the mounting box (20) via a bearing.

8. The flexible printed circuit board clamping assembly according to claim 7, characterized in that: A driving motor (63) is provided on the top of the rotating shaft (61); the driving motor (63) is fixedly mounted on the inner wall of the mounting box (20) through a reinforcing plate; a winding wheel (64) is fixedly mounted on the output shaft of the driving motor (63); the winding wheel (64) is fixedly mounted on the end of the connecting belt (65) away from the first pulley (69).

9. The flexible printed circuit board clamping assembly according to claim 7, characterized in that: The second clamping assembly (5) includes two second damping sliders (53) slidably connected to the first slide rail (22); the two second damping sliders (53) are fixedly mounted on the lifting plate (51); a second negative pressure head (50) is fixedly mounted on the bottom of the lifting plate (51) through an air pipe; a second tooth plate (52) is further provided between the two second damping sliders (53); the second tooth plate (52) is meshedly connected to the first gear (60).

10. The flexible printed circuit board clamping assembly according to claim 7, characterized in that: The box assembly (2) is fixedly mounted inside the fixing frame (1); wherein, an electric push cylinder (3) is also fixedly mounted on the top of one end; and the push rod of the electric push cylinder (3) is fixedly mounted on the lifting frame (41).

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