Composite laser rubber tapping machine

Abstract

The utility model discloses a combined type laser rubber tapping machine which is characterized in that a first rubber tapping mechanism is arranged in the Y-axis direction and adjusts the distance between two first rubber tapping modules in the X-axis direction, and a second rubber tapping mechanism is arranged in the X-axis direction and adjusts the distance between two second rubber tapping modules in the Y-axis direction. The first rubber tapping mechanism and the second rubber tapping mechanism are vertically arranged, the length of the first rubber tapping mechanism in the Y-axis direction is the adjustable maximum distance of the second rubber tapping mechanism, and the length of the second rubber tapping mechanism in the X-axis direction is the adjustable maximum distance of the first rubber tapping mechanism in the X-axis direction. The first rubber tapping mechanism and the second rubber tapping mechanism are connected more tightly, the structure is more compact, a circuit board to be cut does not need to rotate, the circuit board to be cut can be completed only by horizontally moving the translation mechanism in the X-axis direction, the translation mechanism is arranged above the first rubber tapping mechanism and the second rubber tapping mechanism, the vertical space is fully utilized, and the circuit board to be cut is more compact in structure. The extra occupied space in the horizontal direction is avoided, and the overall occupied area is small.

Description

TECHNICAL FIELD

[0001] The utility model relates to automatic equipment technical field more specifically, is related to a compound laser rubber cutting machine. BACKGROUND

[0002] In the electronic manufacturing industry, the production of circuit boards is one of the key links to ensure the performance and quality of electronic products. Among them, rubber cutting and PIN withdrawing as important processes in the manufacturing process of circuit boards, have irreplaceable role for improving the electrical connection reliability and overall structural stability of circuit board.

[0003] With the rapid development of industrial automation technology, in order to improve production efficiency and reduce cost, the automatic rubber cutting and PIN withdrawing device emerges as the times require. These devices realize efficient and accurate processing of circuit boards by integrating advanced mechanical arms, precision sensors and intelligent control systems. However, although automation technology has achieved remarkable results in improving production speed and reducing manual intervention, the existing rubber cutting and PIN withdrawing device still faces some challenges in the design of rubber cutting device.

[0004] The existing rubber cutting device adopts a linear processing flow, including short side rubber cutting mechanism, rotating mechanism and long side rubber cutting mechanism arranged in turn, which form a complete rubber cutting production line. Specifically, after feeding, the circuit board will first enter the short side rubber cutting mechanism for short side rubber cutting. After short side rubber cutting is completed, the circuit board will be conveyed to the rotating mechanism to adjust the direction by 90° to ensure that the long side of the circuit board can be correctly aligned with the long side rubber cutting mechanism. Then, the circuit board is subjected to long side rubber cutting at the long side rubber cutting mechanism, thereby completing the entire rubber cutting process.

[0005] The short side rubber cutting mechanism, rotating mechanism and long side rubber cutting mechanism are arranged in turn, resulting in a relatively long rubber cutting device and large floor area. INVENTION CONTENTS

[0006] In order to overcome the problem that the short side rubber cutting mechanism, rotating mechanism and long side rubber cutting mechanism of the existing rubber cutting device are arranged in turn, resulting in a relatively long device and large floor area, the utility model provides a compound laser rubber cutting machine.

[0007] The utility model technical scheme is as follows:

[0008] A compound laser rubber cutting machine comprises:

[0009] A rack is provided with a first sliding rail along the X-axis direction, and a second sliding rail along the Y-axis direction;

[0010] The first rubber cutting mechanism is arranged along the Y-axis direction, and comprises two first rubber cutting modules, both of which are slidingly arranged on the first sliding rail and used for adjusting the interval between the two first rubber cutting modules along the X-axis direction.

[0011] The second rubber cutting mechanism is arranged along the X-axis direction, and comprises two second rubber cutting modules, one of which is mounted on the rack, and the other of which is slidingly arranged on the second sliding rail and used for adjusting the interval between the two second rubber cutting modules along the Y-axis direction.

[0012] The translation mechanism is arranged above the first rubber cutting mechanism and the second rubber cutting mechanism, and is used for translating the circuit board to be cut from the first rubber cutting mechanism to the second rubber cutting mechanism along the X-axis direction.

[0013] According to the above-mentioned scheme, each first rubber cutting module comprises a first rubber cutting side plate and a laser cutting unit arranged on the first rubber cutting side plate, the first rubber cutting side plate slides along the first sliding rail through a first cutting transmission mechanism, and the laser cutting unit is slidingly connected with the first rubber cutting side plate and used for moving along the Y-axis direction on the first rubber cutting side plate.

[0014] According to the above-mentioned scheme, the first sliding rail is four, and two first sliding rails are arranged on the two sides of the first rubber cutting side plate.

[0015] According to the above-mentioned scheme, the first cutting transmission mechanism comprises a cutting adjustment motor, a cutting adjustment belt, a cutting horizontal transmission rod, a cutting vertical transmission rod and four cutting adjustment screws, the cutting adjustment screws are arranged above the first sliding rail, the first rubber cutting side plate is sleeved on the cutting adjustment screws, and the bottom of the first rubber cutting side plate is slidingly connected with the first sliding rail through a cutting sliding block.

[0016] The cutting horizontal transmission rod is connected with the cutting adjustment screws on the same side of the first rubber cutting side plate, the cutting vertical transmission rod is connected with the cutting adjustment screws on the two sides of the first rubber cutting side plate, the cutting vertical transmission rod is connected with the cutting horizontal transmission rod, and the cutting horizontal transmission rod is connected with the cutting adjustment motor through the cutting adjustment belt, so that the cutting adjustment motor drives both first rubber cutting side plates to slide along the first sliding rail in the X-axis direction through the cutting adjustment belt.

[0017] According to the utility model, the first rubber tapping side plate is provided with a laser position adjusting track and a laser position driving unit, the laser cutting unit is slidably connected with the laser position adjusting track, the laser cutting unit is further connected with the laser position driving unit, and the laser position driving unit drives the laser cutting unit to slide along the laser position adjusting track in the Y-axis direction.

[0018] According to the utility model, the laser position adjusting track is two, and the laser position driving unit is located between the two laser position adjusting tracks.

[0019] According to the utility model, a conveying module is arranged between the two first rubber tapping modules, and the conveying module is used for moving and conveying the circuit board to be cut to the tail end of the first rubber tapping module.

[0020] According to the utility model, the second rubber tapping module is the same in structure as the first rubber tapping module, the second rubber tapping side plate of the second rubber tapping module is provided with a baffle, and the two ends of the circuit board to be cut are arranged on the baffle.

[0021] According to the utility model, the translation mechanism comprises a lifting module and a clamping module, the lifting module is slidably arranged on a third sliding rail arranged along the X-axis direction of the rack, and the lifting module is connected with the clamping module and used for driving the clamping module to move up and down along the Z-axis direction.

[0022] According to the utility model, the clamping module comprises two clamping units, a clamping position adjusting belt and a clamping position adjusting motor, the two clamping units are connected with the two sides of the clamping position adjusting belt respectively, the clamping position adjusting belt is connected with the clamping position adjusting motor, so that the clamping position adjusting motor drives the two clamping units to approach or move away through the clamping position adjusting motor.

[0023] The utility model discloses a composite laser rubber cutting machine, the first rubber cutting mechanism is arranged along Y axle direction, and the interval between two first rubber cutting modules is adjusted along X axle direction to adapt to the short side of the circuit board to be cut and carry out the rubber cutting treatment of short side, after the rubber cutting of short side is completed, the translation mechanism translates the circuit board to be cut from the first rubber cutting mechanism to the second rubber cutting mechanism, the second rubber cutting mechanism is arranged along X axle direction, and the interval between two second rubber cutting modules is adjusted along Y axle direction in one second rubber cutting module to adapt to the long side of the circuit board to be cut and carry out the rubber cutting treatment of long side, after the rubber cutting is completed, the second rubber cutting module moves along Y axle direction and promotes the circuit board after cutting to move to the next station. The first rubber cutting mechanism and the second rubber cutting mechanism are arranged perpendicularly, the length of the first rubber cutting mechanism in Y axle direction is the maximum interval of the second rubber cutting mechanism, the length of the second rubber cutting mechanism in X axle direction is the maximum interval of the first rubber cutting mechanism in X axle direction, and the first rubber cutting mechanism and the second rubber cutting mechanism are more closely connected and more compact in structure, and the four side cutting of the circuit board to be cut can be completed after the translation mechanism moves between the first rubber cutting mechanism and the second rubber cutting mechanism, and the circuit board to be cut does not need to rotate, the translation mechanism is arranged above the first rubber cutting mechanism and the second rubber cutting mechanism, fully utilizes the vertical space, avoids the extra space occupied in the horizontal direction, and the device is small in overall floor space. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the structural schematic diagram of the utility model;

[0025] Figure 2 It is the structural schematic diagram of the utility model removes part frame;

[0026] Figure 3 It is the structural schematic diagram of the first rubber cutting mechanism of the utility model;

[0027] Figure 4 It is the structural schematic diagram of another view of the first rubber cutting mechanism of the utility model;

[0028] Figure 5 It is the structural schematic diagram of the translation mechanism of the utility model;

[0029] Figure 6 It is the explosion structural schematic diagram of the translation mechanism of the utility model.

[0030] In the drawing, various reference signs are as follows:

[0031] 10, rack; 101, first slide rail; 102, second slide rail; 103, third slide rail; 20, first tapping mechanism; 201, first tapping module; 202, first tapping side plate; 2021, laser position adjusting track; 2022, laser position driving unit; 203, laser cutting unit; 204, first cutting transmission mechanism; 2041, cutting adjusting motor; 2042, cutting adjusting belt; 2043, cutting transverse transmission rod; 2044, cutting longitudinal transmission rod; 2045, cutting adjusting screw rod; 2046, cutting sliding block; 205, conveying module; 30, second tapping mechanism; 301, second tapping module; 302, second tapping side plate; 303, baffle; 40, translation mechanism; 401, lifting module; 402, clamping module; 4021, clamping unit; 4022, clamping position adjusting belt; 4023, clamping position adjusting motor. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model more clearly understood, the utility model will be further described in detail below in combination with the drawings and embodiments.

[0033] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification and claims of the utility model are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally further include steps or units not listed, or can optionally further include other steps or units inherent to the process, method, product or device. The term "provided" and other terms should be broadly understood, for example, it can be fixedly connected, or can be detachably connected, or can be integrated; it can be mechanically connected, or can be electrically connected; it can be directly connected, or can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specified. The terms "upper", "lower", "left", "right", "front", "back", "bottom" and the like indicate the orientation or position shown in the drawings, and are only for convenience of description, and cannot be understood as a limitation on the technical solutions.

[0034] It should be noted that the existing rubber cutting device adopts a linear processing flow, including a short-side rubber cutting mechanism, a rotating mechanism and a long-side rubber cutting mechanism arranged in sequence. These mechanisms are arranged in sequence to form a complete rubber cutting production line. Specifically, after the circuit board is fed in, it will first enter the short-side rubber cutting mechanism for short-side rubber cutting processing. After the short-side rubber cutting is completed, the circuit board will be conveyed to the rotating mechanism to adjust the direction by 90° to ensure that the long side of the circuit board can be correctly aligned with the long-side rubber cutting mechanism. Subsequently, the circuit board is subjected to long-side rubber cutting processing at the long-side rubber cutting mechanism, thereby completing the entire rubber cutting process.

[0035] The short-side rubber cutting mechanism, the rotating mechanism and the long-side rubber cutting mechanism are arranged in sequence, resulting in a relatively long overall rubber cutting device and a large floor area.

[0036] As shown in Figures 1-6 The first rubber cutting mechanism 20 is arranged along the Y-axis direction and adjusts the spacing between the two first rubber cutting modules 201 along the X-axis direction to adapt to the short side of the circuit board to be cut and perform short-side rubber cutting processing. After the short-side rubber cutting is completed, the translation mechanism 40 translates the circuit board to be cut from the first rubber cutting mechanism 20 to the second rubber cutting mechanism 30. The second rubber cutting mechanism 30 is arranged along the X-axis direction, and one of the second rubber cutting modules 301 adjusts the spacing between the two second rubber cutting modules 301 along the Y-axis direction to adapt to the long side of the circuit board to be cut and perform long-side rubber cutting processing. After the rubber cutting is completed, the second rubber cutting module 301 moves along the Y-axis direction to push the cut circuit board to the next station.

[0037] The first rubber cutting mechanism 20 and the second rubber cutting mechanism 30 are arranged vertically. The length of the first rubber cutting mechanism 20 in the Y-axis direction is the maximum adjustable spacing of the second rubber cutting mechanism 30, and the length of the second rubber cutting mechanism 30 in the X-axis direction is the maximum adjustable spacing of the first rubber cutting mechanism 20 in the X-axis direction. The first rubber cutting mechanism 20 and the second rubber cutting mechanism 30 are more closely related and more compact in structure. After moving between the first rubber cutting mechanism 20 and the second rubber cutting mechanism 30 by the translation mechanism, the four sides of the circuit board to be cut can be cut. The circuit board to be cut does not need to be rotated. The translation mechanism 40 is arranged above the first rubber cutting mechanism 20 and the second rubber cutting mechanism 30, fully utilizing the vertical space and avoiding additional space occupation in the horizontal direction. The overall device occupies a small floor area.

[0038] The composite laser rubber cutting machine includes a rack 10, a first rubber cutting mechanism 20, a second rubber cutting mechanism 30 and a translation mechanism 40. The rack 10 is provided with a first sliding rail 101 along the X-axis direction, and the rack 10 is provided with a second sliding rail 102 along the Y-axis direction.

[0039] The first rubber cutting mechanism 20 is arranged along the Y-axis direction, and the first rubber cutting mechanism 20 includes two first rubber cutting modules 201, both of which are slidingly arranged on the first sliding rail 101, for adjusting the distance between the two first rubber cutting modules 201 along the X-axis direction, so as to flexibly adapt to the short side of the circuit board to be cut and perform rubber cutting processing;

[0040] The second rubber cutting mechanism 30 is arranged along the X-axis direction, and the second rubber cutting mechanism 30 includes two second rubber cutting modules 301, one of which is mounted on the rack 10, and the other is slidingly arranged on the second sliding rail 102, for adjusting the distance between the two second rubber cutting modules 301 along the Y-axis direction, so as to conveniently adapt to the long side of the circuit board to be cut and perform rubber cutting processing;

[0041] The translation mechanism 40 is arranged above the first rubber cutting mechanism 20 and the second rubber cutting mechanism 30, for translating the circuit board to be cut from the first rubber cutting mechanism 20 to the second rubber cutting mechanism 30 along the X-axis direction.

[0042] As shown in Figures 3-4 In one embodiment, each first rubber cutting module 201 includes a first rubber cutting side plate 202 and a laser cutting unit 203 arranged on the first rubber cutting side plate 202, the first rubber cutting side plate 202 slides along the first sliding rail 101 through a first cutting transmission mechanism 204, the first rubber cutting side plate 202 moves along the first sliding rail 101 in the X-axis direction to adapt to the short side of the circuit board to be cut, and the laser cutting unit 203 is slidingly connected with the first rubber cutting side plate 202, for moving along the Y-axis direction on the first rubber cutting side plate 202 to cut a plurality of adhesive tapes on the short side.

[0043] As shown in Figure 3 In one embodiment, the first sliding rail 101 is four, two first sliding rails 101 are arranged on both sides of the first rubber cutting side plate 202, providing a stable track for the sliding of the rubber cutting side plate, and ensuring stable rubber cutting process.

[0044] The first cutting transmission mechanism 204 includes a cutting adjustment motor 2041, a cutting adjustment belt 2042, a cutting horizontal transmission rod 2043, a cutting vertical transmission rod 2044, and four cutting adjustment screws 2045, the cutting adjustment screws 2045 are arranged above the first sliding rail 101, the first rubber cutting side plate 202 is sleeved on the cutting adjustment screws 2045, and the bottom of the first rubber cutting side plate 202 is slidingly connected with the first sliding rail 101 through a cutting sliding block 2046, so that the first rubber cutting side plate 202 can stably slide on the first sliding rail 101;

[0045] The cutting transverse transmission rod 2043 is connected with the cutting adjustment screw rod 2045 on the same side of the first rubber tapping side plate 202, the cutting longitudinal transmission rod 2044 is connected with the cutting adjustment screw rod 2045 on both sides of the first rubber tapping side plate 202, the cutting longitudinal transmission rod 2044 is connected with the cutting transverse transmission rod 2043, and the cutting transverse transmission rod 2043 is connected with the cutting adjustment motor 2041 through the cutting adjustment belt 2042, so that the cutting adjustment motor 2041 drives the two first rubber tapping side plates 202 to slide in the X-axis direction along the first sliding rail 101 through the cutting adjustment belt 2042.

[0046] The cutting adjustment motor 2041 drives the cutting transverse transmission rod 2043 to rotate through the cutting adjustment belt 2042, drives the two cutting adjustment screw rods 2045 on one side of the first rubber tapping side plate 202 to rotate, and simultaneously drives the two cutting adjustment screw rods 2045 on the other side to rotate through the cutting longitudinal transmission rod 2044.

[0047] By controlling only one cutting adjustment motor 2041, the two first rubber tapping side plates 202 can be driven to move synchronously in the X-axis direction along the first sliding rail 101. When the cutting adjustment motor 2041 rotates, the two first rubber tapping side plates 202 are smoothly pushed to slide in the X-axis direction along the first sliding rail 101 through the cooperative action of the cutting adjustment belt 2042, the cutting transverse transmission rod 2043 and the cutting longitudinal transmission rod 2044. This synchronous movement not only improves the efficiency of rubber tapping, but also ensures the accuracy and stability of rubber tapping.

[0048] As shown in FIG. Figure 4 In one embodiment, the first rubber tapping side plate 202 is provided with a laser position adjustment track 2021 and a laser position driving unit 2022, the laser cutting unit 203 is slidably connected with the laser position adjustment track 2021, and the laser cutting unit 203 is further connected with the laser position driving unit 2022. The laser position driving unit 2022 drives the laser cutting unit 203 to slide in the Y-axis direction along the laser position adjustment track 2021.

[0049] Specifically, the laser position adjustment track 2021 is provided with two laser position adjustment tracks 2021, and the laser position driving unit 2022 is located between the two laser position adjustment tracks 2021. The arrangement of the two laser position adjustment tracks 2021 makes the movement of the laser cutting unit 203 driven by the laser position driving unit 2022 in the Y-axis direction more stable, ensures that the laser cutting unit 203 moves at a required speed in the Y-axis direction, and thus realizes accurate laser cutting.

[0050] As shown in FIG. Figure 3As shown, in one embodiment, a conveying module 205 is arranged between the two first rubber cutting modules 201, and the conveying module 205 is used to move the circuit board to be cut to the tail end of the first rubber cutting module 201. After the short side rubber cutting is completed, the conveying module 205 ensures that the translation mechanism 40 can directly clamp the short side of the circuit board to be cut each time, and the circuit board to be cut is moved to the second rubber cutting mechanism 30.

[0051] In one embodiment, the second rubber cutting module 301 has the same structure as the first rubber cutting module 201, and the second rubber cutting side plate 302 of the second rubber cutting module 301 is provided with a baffle 303, and the two ends of the circuit board to be cut are arranged on the baffle 303.

[0052] As shown, Figures 5-6 As shown, in one embodiment, the translation mechanism 40 includes a lifting module 401 and a clamping module 402. The lifting module 401 is slidably arranged on the third sliding rail 103 arranged along the X-axis direction of the rack 10, and the lifting module 401 can move freely in the X-axis direction. The lifting module 401 is connected with the clamping module 402, and is used to drive the clamping module 402 to move up and down along the Z-axis direction.

[0053] The clamping module 402 includes two clamping units 4021, a clamping position adjusting belt 4022, and a clamping position adjusting motor 4023. The two clamping units 4021 are respectively connected with the two sides of the clamping position adjusting belt 4022. The clamping position adjusting belt 4022 is connected with the clamping position adjusting motor 4023, so that the clamping position adjusting motor 4023 drives the two clamping units 4021 to approach or move away from each other. The clamping module 402 can be self-adaptively adjusted according to the size of different circuit boards to be cut, so as to ensure the smooth progress of the cutting process.

[0054] It should be understood that those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall fall within the protection scope of the appended claims of the present application.

[0055] The above exemplary description of the present application is made in combination with the drawings. Obviously, the implementation of the present application is not limited to the above manner. Any improvement or change made by using the method concept and technical solution of the present application, or directly applying the concept and technical solution of the present application to other occasions without improvement, all fall within the protection scope of the present application.

Claims

1. A combined laser rubber cutting machine, characterized in that, The utility model relates to a cutting mechanism for circuit board, comprising: a rack, the rack is equipped with first slide rail along X axle direction, the rack is equipped with second slide rail along Y axle direction; First tapping mechanism, first tapping mechanism is arranged along Y axle direction, first tapping mechanism includes two first tapping module, two first tapping module is all slidingly arranged on first slide rail, is used for adjusting the interval between two first tapping module along X axle direction; Second tapping mechanism, second tapping mechanism is arranged along X axle direction, second tapping mechanism includes two second tapping module, one second tapping module is installed on the rack, another second tapping module is slidingly arranged on second slide rail, is used for adjusting the interval between two second tapping module along Y axle direction; Translation mechanism, translation mechanism is arranged above first tapping mechanism and second tapping mechanism, is used for the circuit board to be cut from first tapping mechanism is translated to second tapping mechanism along X axle direction.

2. The combined laser rubber cutting machine according to claim 1, characterized in that, Each first tapping module includes first tapping side plate and laser cutting unit arranged on first tapping side plate, first tapping side plate slides along first slide rail through first cutting transmission mechanism, laser cutting unit is slidingly connected with first tapping side plate, is used for moving on first tapping side plate along Y axle direction.

3. The combined laser rubber cutting machine according to claim 2, characterized in that, The first slide rail is four, two first slide rails are arranged on both sides of the first tapping side plate.

4. The combined laser rubber cutting machine according to claim 3, characterized in that, The first cutting transmission mechanism includes a cutting adjustment motor, a cutting adjustment belt, a cutting horizontal transmission rod, a cutting vertical transmission rod and a cutting adjustment screw. The cutting adjustment screw is four, the cutting adjustment screw is above the first slide rail, the first tapping side plate is sleeved on the cutting adjustment screw, and the bottom of the first tapping side plate is slidingly connected with the first slide rail through the cutting slider. The cutting horizontal transmission rod connects the cutting adjustment screws on the same side of the first tapping side plate, the cutting vertical transmission rod connects the cutting adjustment screws on both sides of the first tapping side plate, the cutting vertical transmission rod is connected with the cutting horizontal transmission rod, and the cutting horizontal transmission rod is connected with the cutting adjustment motor through the cutting adjustment belt, so that the cutting adjustment motor drives two first tapping side plates to slide along the first slide rail in X axle direction through the cutting adjustment belt.

5. The combined laser rubber cutting machine according to claim 2 or 4, characterized in that, The first tapping side plate is provided with a laser position adjusting track and a laser position driving unit. The laser cutting unit is slidingly connected with the laser position adjusting track, and the laser cutting unit is also connected with the laser position driving unit. The laser position driving unit drives the laser cutting unit to slide along the laser position adjusting track in Y axle direction.

6. The combined laser rubber cutting machine according to claim 5, characterized in that, The laser position adjusting track is two, and the laser position driving unit is located between the two laser position adjusting tracks.

7. The combined laser rubber cutting machine according to claim 1, characterized in that, A conveying module is arranged between the two first tapping modules, and the conveying module is used for moving the circuit board to be cut to the tail end of the first tapping module.

8. The combined laser rubber cutting machine according to claim 6, characterized in that, The second rubber cutting module is identical in structure to the first rubber cutting module, and a baffle is arranged on a second rubber cutting side plate of the second rubber cutting module, and two ends of the circuit board to be cut are arranged on the baffle.

9. The combined laser rubber cutting machine according to claim 1, characterized in that, The translation mechanism comprises a lifting module and a clamping module, the lifting module is slidably arranged on a third sliding rail arranged along the X-axis direction of the rack, and the lifting module is connected with the clamping module and used to drive the clamping module to move up and down along the Z-axis direction.

10. The combined laser rubber cutting machine according to claim 9, characterized in that, The clamping module comprises two clamping units, a clamping position adjusting belt and a clamping position adjusting motor, the two clamping units are respectively connected with two sides of the clamping position adjusting belt, the clamping position adjusting belt is connected with the clamping position adjusting motor, so that the clamping position adjusting motor drives the two clamping units to approach or move away from each other.

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