A PVC flame-retardant film tape cutting device

Abstract

This utility model belongs to the field of film tape cutting, and particularly relates to a PVC flame-retardant film tape cutting device. This utility model provides a PVC flame-retardant film tape cutting device, including a film tape roll disposed on one side of a processing table. A pressure plate is mounted on the side of the processing table surface near the film tape roll via an elastic component. The pressure plate, through the elastic force of the elastic component, squeezes and limits the film tape on the processing table surface to prevent the film tape from retracting after cutting. By driving the pressure plate through the elastic component to squeeze and limit the film tape on the processing table surface, it effectively prevents the free end of the tape from shifting or wrinkling due to elastic recoil after cutting, avoiding the need for operators to search for and pull out the tape again, reducing operation steps, improving cutting efficiency, and when pulling the film tape to cut, the pressure plate can smooth the film tape, preventing wrinkles from affecting the quality of the cut film tape.

Description

Technical Field

[0001] This utility model belongs to the field of film tape cutting, and in particular relates to a PVC flame-retardant film tape cutting device. Background Technology

[0002] In the production, processing, and end-use scenarios of PVC flame-retardant film tape, depending on different application requirements (such as electronic component packaging, cable insulation wrapping, etc.), the rolled film tape needs to be cut into segments of a fixed length. Current mainstream film tape cutting devices have significant drawbacks in actual operation: after the device cuts the pulled-out tape, the remaining tape still attached to the roller is prone to retracting under elasticity, causing the free end of the tape to retract to its initial position or become wrinkled. When cutting again, the operator needs to find and pull out the free end of the tape again, increasing the operation steps and reducing cutting efficiency. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned technical problems by providing a PVC flame-retardant film tape cutting device. This device uses an elastic component to drive a pressure plate, which compresses and limits the film tape on the processing table surface. This effectively prevents the free end of the tape from shifting or wrinkling due to elastic recoil after cutting, avoiding the need for operators to repeatedly search for and pull out the tape. This reduces operational steps, improves cutting efficiency, and, when pulling the film tape to cut, the pressure plate smooths the tape, preventing wrinkles that could affect the quality of the cut tape.

[0004] In view of this, the present invention provides a PVC flame-retardant film tape cutting device, including a film tape roll disposed on one side of a processing table. A pressure plate is installed on the side of the processing table near the film tape roll via an elastic component. The pressure plate squeezes and limits the film tape on the processing table surface through the elastic force of the elastic component, so as to prevent the film tape from retracting after cutting.

[0005] A through groove is provided on the processing table surface of the pressure plate on the side away from the film tape roll, and a cutting blade is installed in the through groove by a horizontal moving component.

[0006] The horizontal moving component can drive the cutting blade to reciprocate in the horizontal direction to cut the film tape after it has been limited by the pressure plate.

[0007] In this technical solution, the pressure plate driven by the elastic component squeezes and limits the film tape on the processing table surface, which can effectively prevent the free end of the tape from shifting or wrinkling due to elastic recoil after cutting. This avoids the operator having to search for and pull out the tape again, reduces operation steps, improves cutting efficiency, and when pulling the film tape to cut, the pressure plate can smooth the film tape, preventing wrinkles from affecting the quality of the film tape after cutting.

[0008] Furthermore, the elastic component includes symmetrically formed connecting holes on both sides of the processing table surface and symmetrically fixed connecting posts on both sides of the pressure plate near the processing table. The two connecting posts correspond to the positions of the two connecting holes and are adapted in size. The length of the connecting post is less than the depth of the connecting hole. A spring is installed at the bottom of the inner cavity of each of the two connecting holes, and the other end of each spring is connected to the bottom end of the two connecting posts.

[0009] In this technical solution, the connecting post and connecting hole in the elastic component are matched and combined with the spring to provide elastic force, which can ensure the stability of the pressure plate's squeezing force on the tape, further guaranteeing the dual effects of limiting and smoothing, while also taking into account the ease of operation.

[0010] Furthermore, the horizontal moving assembly includes a lead screw rotatably connected between the two ends of the through groove cavity and a drive motor fixedly connected to one end of the outer side of the processing table. The drive end of the drive motor is connected to one end of the lead screw via a coupling. A moving block is threaded onto the outside of the lead screw in the through groove. The cutting blade is detachably connected to the surface of the moving block via bolts.

[0011] In this technical solution, the lead screw is driven by a drive motor to rotate, which causes the sleeved moving block to move the cutting blade smoothly. This is more stable than manual cutting and ensures a flat cut end.

[0012] Furthermore, the surface of the processing table is engraved with scale lines for measuring the cutting length of the film tape. The starting reference end of the scale lines coincides with the end of the pressure plate away from the film tape roll, and the scale values ​​of the scale lines are sequentially increased in the direction away from the pressure plate.

[0013] In this technical solution, the scale lines on the surface of the processing table start from the end of the pressure plate and the scale values ​​increase progressively. Operators can directly determine the tape cutting length based on the scale lines without the need for additional measuring tools, simplifying the fixed-length operation and improving cutting accuracy.

[0014] Furthermore, the processing table is symmetrically fixedly connected to two support frames on both sides of one end near the film tape roll. Each of the two support frames has a connecting groove at one end, and the top of the connecting groove extends through to the top of the support frame.

[0015] The gap formed between the inner cavities of the two connecting grooves is adapted to the axial distance between the two ends of the connecting shaft of the film tape roll, and is used to accommodate the two ends of the connecting shaft.

[0016] In this technical solution, the support frames on both sides of the processing table end accommodate the connecting shaft of the film tape roll through the connecting groove, and the spacing of the connecting groove is adapted to the size of the connecting shaft, making the roll easy to install and disassemble, facilitating quick roll replacement, and further improving work efficiency.

[0017] Furthermore, both sides of the same end of the inner cavity of the pressure plate and the through groove are provided with arc-shaped grooves, and the two arc-shaped grooves on the pressure plate and the through groove correspond to each other.

[0018] In this technical solution, the arc-shaped grooves on both sides of the same end of the pressure plate and the through groove correspond to form an operating space where the operator's fingers can be inserted. The operator can insert his / her fingers into the arc-shaped groove to pull the film tape between the pressure plate and the processing table, avoiding the difficulty of pulling due to the lack of a point of force for the hand, further improving the convenience of operation and ensuring a smooth pulling and cutting process.

[0019] Furthermore, the end of the through groove near the pressure plate is coplanar with the side end of the pressure plate, and one end of the cutting blade is movably attached to the pressure plate.

[0020] In this technical solution, the end of the through groove near the pressure plate is coplanar with the side end of the pressure plate, and one end of the cutting blade is attached to the pressure plate. This ensures that the blade can accurately cut into the edge of the pressure plate when cutting the tape, avoiding a decrease in cutting accuracy due to misalignment between the blade and the pressure plate, and improving the cutting quality.

[0021] Furthermore, the bottom of the end of the pressure plate away from the through groove is chamfered, and the angle of the chamfer is 30°.

[0022] In this technical solution, a chamfer is provided at the bottom of the end of the pressure plate away from the through groove, which can guide the film tape to slide smoothly into the bottom of the pressure plate, avoid the edge of the tape being stuck by the end of the pressure plate, reduce the resistance of tape pulling, further improve the ease of operation, and ensure work efficiency.

[0023] Furthermore, telescopic bellows are sleeved on the outer sides of the lead screws on both sides of the moving block, and the two ends of the two telescopic bellows are respectively connected to the inner cavity of the through groove and the side end of the moving block.

[0024] In this technical solution, the telescopic corrugated tube can protect the outside of the lead screw, preventing debris from getting stuck on the outside of the lead screw and thus preventing the movement of the cutting blade.

[0025] The beneficial effects of this utility model are:

[0026] This invention uses an elastic component to drive a pressure plate to squeeze and limit the film tape on the processing table surface. This effectively prevents the free end of the tape from shifting or wrinkling due to elastic recoil after cutting, avoiding the need for operators to search for and pull out the tape again. This reduces operation steps, improves cutting efficiency, and when the film tape is pulled to cut, the pressure plate can smooth the film tape, preventing wrinkles from affecting the quality of the cut film tape. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the connection structure between the pressure plate and the processing table of this utility model;

[0029] Figure 3 This is an enlarged structural diagram of point A of this utility model;

[0030] Figure 4 This is a schematic diagram of the connection structure between the lead screw and the telescopic bellows of this utility model;

[0031] Figure 5 This is a schematic diagram of the connection structure between the cut film tape and the pressure plate of this utility model.

[0032] In the diagram: 1. Processing table; 2. Scale line; 3. Through groove; 4. Pressure plate; 5. Support frame; 6. Film tape roll; 7. Connecting groove; 8. Cutting blade; 9. Drive motor; 10. Arc groove; 11. Connecting hole; 12. Connecting column; 13. Spring; 14. Chamfer structure; 15. Moving block; 16. Lead screw; 17. Telescopic corrugated pipe. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0035] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0037] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0038] Example 1:

[0039] like Figure 1-5As shown, this utility model provides a PVC flame-retardant film tape cutting device, including a film tape roll 6 disposed on one side of a processing table 1. A pressure plate 4 is installed on the side of the processing table 1 near the film tape roll 6 through an elastic component. The pressure plate 4 squeezes and limits the film tape on the processing table 1 through the elastic force of the elastic component, so as to prevent the film tape from retracting after cutting.

[0040] A through groove 3 is provided on the processing table 1 on the side of the pressure plate 4 away from the film tape roll 6, and a cutting blade 8 is installed in the through groove 3 by means of a horizontal moving component.

[0041] The horizontal moving component can drive the cutting blade 8 to reciprocate in the horizontal direction to cut the film tape after it has been limited by the pressure plate 4.

[0042] In the example of this application, the elastic component can continuously apply an elastic force toward the table surface of the processing table 1 to the pressure plate 4, so that the pressure plate 4 tightly squeezes and limits the film tape. After the cutting operation, when the tape tends to retract due to its own elasticity, the squeezing force of the pressure plate 4 can firmly fix the free end of the tape, preventing it from shifting or wrinkling. There is no need for the operator to find and pull out the tape again, reducing operation steps and improving efficiency. At the same time, when the tape is pulled to prepare for cutting, the surface of the tape will generate sliding friction with the lower surface of the pressure plate 4. The flat lower surface of the pressure plate 4 can smooth out the wrinkles on the surface of the tape, ensuring that the tape enters the cutting stage in a flat state. The horizontal movement component drives the cutting blade 8 to move back and forth stably in the horizontal direction, which can perform straight cutting on the tape after it has been limited and smoothed, avoiding the deviation problem during manual cutting. This solves the defects of the existing device in terms of inconvenience and poor quality, and balances efficiency and cutting quality.

[0043] As a preferred example of this application, the elastic component includes connecting holes 11 symmetrically opened on both sides of the surface of the processing table 1 and connecting posts 12 symmetrically fixedly connected to both sides of the pressure plate 4 near one end of the processing table 1. The two connecting posts 12 are respectively positioned and matched with the two connecting holes 11, and the length of the connecting post 12 is less than the depth of the connecting hole 11. Springs 13 are installed at the bottom of the inner cavity of the two connecting holes 11, and the other ends of the two springs 13 are respectively connected to the bottom ends of the two connecting posts 12.

[0044] In the example of this application, the connecting post 12 corresponds to the connecting hole 11 in position and is sized to fit it. This restricts the pressure plate 4 to move only up and down along the axial direction of the connecting hole 11, preventing uneven positioning caused by the pressure plate 4 shifting. The length of the connecting post 12 is less than the depth of the connecting hole 11, leaving space for the compression of the spring 13. The spring 13 is installed between the bottom end of the connecting hole 11 and the connecting post 12, and can continuously apply an upward elastic force to the connecting post 12 through its own elastic deformation, thereby driving the pressure plate 4 to form a stable squeezing force on the tape. When it is necessary to pull the tape, slightly lifting the pressure plate 4 will stretch the spring 13 and increase the distance between the pressure plate 4 and the table surface, making it easier for the tape to move. After releasing the pressure plate 4, the spring 13 returns to its original position and pushes the pressure plate 4 to press the tape again. This avoids the problem of insufficient spring force causing positioning failure, tape retraction, or poor smoothing effect, while also preventing excessive spring force from making it difficult to pull the tape. This ensures stable positioning and smoothing effects while also taking into account ease of operation.

[0045] As a preferred example of this application, the horizontal moving assembly includes a lead screw 16 rotatably connected between the two ends of the inner cavity of the through groove 3 and a drive motor 9 fixedly connected to one end of the outer side of the processing table 1. The drive end of the drive motor 9 is connected to one end of the lead screw 16 via a coupling. A moving block 15 is threadedly fitted onto the outside of the lead screw 16 in the through groove 3. The cutting blade 8 is detachably connected to the surface of the moving block 15 via bolts.

[0046] In the example of this application, after the drive motor 9 starts, its power is transmitted to the lead screw 16 via the coupling, causing the lead screw 16 to rotate around its own axis. Since the moving block 15 is threadedly engaged with the lead screw 16, and the through slot 3 provides radial restraint to the moving block 15, the rotational motion of the lead screw 16 can be converted into the horizontal linear motion of the moving block 15, thereby driving the cutting blade 8 to move synchronously and smoothly. Compared to manually pushing the blade for cutting, the motor-driven lead screw 16 has higher transmission precision, ensuring that the blade always moves horizontally and the cut end face is flat and without skewing. It should be noted that the reciprocating movement of the cutting blade 8 is achieved through the forward and reverse rotation of the drive motor 9. How the motor achieves forward and reverse rotation is a well-known technology and will not be elaborated upon here.

[0047] As a preferred example of this application, the surface of the processing table 1 is engraved with scale lines 2 for measuring the cutting length of the film tape. The starting reference end of the scale line 2 coincides with the end of the pressure plate 4 away from the film tape roll 6, and the scale value of the scale line 2 is set to increase sequentially in the direction away from the pressure plate 4.

[0048] In the example of this application, the scale line 2 takes the end of the pressure plate 4 away from the roller as the starting reference end. This reference end is exactly the starting cutting position after the tape is limited. When the operator pulls the tape, he can directly observe the scale value corresponding to the free end of the tape and quickly determine the required cutting length without the need to use additional tools such as a tape measure. Moreover, the scale value increases in the direction away from the pressure plate 4, which is consistent with the direction of tape pulling. This conforms to the operator's visual habits, avoids reading confusion, and can save the separate measurement step, shorten the time of setting, and reduce the error of manual measurement, ensuring that the tape length cut each time is accurate and consistent.

[0049] As a preferred example of this application, the processing table 1 is symmetrically fixedly connected to two sides of one end near the film tape roll 6, and each of the two support frames 5 has a connecting groove 7 at one opposite end, with the top of the connecting groove 7 extending through to the top of the support frame 5.

[0050] The spacing between the inner cavities of the two connecting grooves 7 is adapted to the axial distance between the two ends of the connecting shaft of the film tape roll 6, and is used to accommodate the two ends of the connecting shaft.

[0051] In the example of this application, when installing the roller, simply align both ends of the connecting shaft with the connecting groove 7 and insert it downwards from the top of the support frame 5 to complete the installation; when disassembling, simply lift the roller upwards to disengage the connecting shaft from the connecting groove 7. Thus, compared with the traditional bolt-fixed roller installation structure, there is no need to remove the bolts, which greatly simplifies the roller disassembly and assembly process, facilitates the quick replacement of exhausted rollers, reduces downtime waiting time, and further improves work efficiency.

[0052] As a preferred example of this application, both sides of the same end of the inner cavity of the pressure plate 4 and the through groove 3 are provided with arc-shaped grooves 10, and the two arc-shaped grooves 10 on the pressure plate 4 and the through groove 3 correspond to each other.

[0053] In the example of this application, the arc-shaped grooves 10 on both sides of the same end of the pressure plate 4 and the through groove 3 correspond to each other, forming a recessed operating space between the pressure plate 4 and the through groove 3. When the operator pulls the tape, their fingers can naturally enter the arc-shaped groove 10, directly contact and pinch the end of the tape below the pressure plate 4. The rounded structure of the arc-shaped groove 10 can prevent the fingers from being scratched by the right-angled edge, while providing a stable force point for the fingers, preventing the hand from slipping when pulling, so that the operator can easily pull the tape to the required length, avoiding the difficulty of pulling due to the lack of a force point for the hand, ensuring a smooth pulling and cutting process, and improving the convenience of operation.

[0054] As a preferred example of this application, the end of the through groove 3 near the pressure plate 4 is coplanar with the side end of the pressure plate 4, and one end of the cutting blade 8 is movably attached to the pressure plate 4.

[0055] In the example of this application, the end of the through groove 3 near the pressure plate 4 is coplanar with the side end of the pressure plate 4, so that the moving path of the cutting blade 8 is in the same plane as the side end of the pressure plate 4. One end of the cutting blade 8 is movably attached to the pressure plate 4. When cutting, the blade moves from the attachment point into the through groove 3, which can accurately cut into the tape from the edge of the pressure plate 4. This can avoid the tape not being cut or leaving a residual section due to misalignment between the blade and the pressure plate 4, ensuring that the tape is cut thoroughly, improving the cutting quality, and avoiding the trouble of subsequent secondary trimming.

[0056] As a preferred example of this application, the bottom of the end of the pressure plate 4 away from the through groove 3 is chamfered, and the angle of the chamfer is 30°.

[0057] In the example of this application, the chamfered structure 14 at the bottom of the end of the pressure plate 4 away from the through groove 3 can guide the edge of the tape to slide smoothly between the pressure plate 4 and the table surface when the tape pulled from the roller moves downwards from the pressure plate 4, thus preventing the edge of the tape from being stuck by the right-angle end of the pressure plate 4. At the same time, the chamfer can reduce the friction area between the tape and the end of the pressure plate 4, reduce the resistance when the tape is pulled, and allow the operator to pull the tape without using too much force, further improving the ease of operation, ensuring work efficiency, and avoiding tape stretching and deformation due to excessive resistance.

[0058] As a preferred example of this application, telescopic bellows 17 are sleeved on the outer sides of the lead screws 16 on both sides of the movable block 15, and the two ends of the two telescopic bellows 17 are respectively connected to the inner cavity of the through groove 3 and the side end of the movable block 15. The inner diameter of the telescopic bellows 17 is larger than the outer diameter of the lead screw 16.

[0059] In the example of this application, when the moving block 15 moves, the telescopic bellows 17 can extend and retract synchronously with it, always covering the exposed part of the lead screw 16, avoiding tape debris or external dust generated during cutting from adhering to the threads of the lead screw 16, and preventing thread jamming from affecting the transmission.

[0060] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A PVC flame-retardant film tape cutting device, characterized in that, Includes a film tape roll (6) disposed on one side of the processing table (1). A pressure plate (4) is installed on the side of the processing table (1) near the film tape roll (6) by an elastic component. The pressure plate (4) squeezes and limits the film tape on the processing table (1) by the elastic force of the elastic component to prevent the film tape from shrinking back after being cut. A through groove (3) is provided on the processing table (1) on the side of the pressure plate (4) away from the film tape roll (6), and a cutting blade (8) is installed in the through groove (3) by a horizontal moving component; The horizontal moving component can drive the cutting blade (8) to reciprocate in the horizontal direction to cut the film tape after it has been limited by the pressure plate (4).

2. The PVC flame-retardant film tape cutting device according to claim 1, characterized in that, The elastic component includes connecting holes (11) symmetrically opened on both sides of the surface of the processing table (1) and connecting posts (12) symmetrically fixed on both sides of the pressure plate (4) near the processing table (1). The two connecting posts (12) are respectively positioned and matched with the two connecting holes (11), and the length of the connecting post (12) is less than the depth of the connecting hole (11). Springs (13) are installed at the bottom of the inner cavity of the two connecting holes (11), and the other end of the two springs (13) is respectively connected to the bottom end of the two connecting posts (12).

3. The PVC flame-retardant film tape cutting device according to claim 1, characterized in that, The horizontal moving assembly includes a lead screw (16) rotatably connected between the two ends of the inner cavity of the through groove (3) and a drive motor (9) fixedly connected to one end of the outer side of the processing table (1). The drive end of the drive motor (9) is connected to one end of the lead screw (16) via a coupling. A moving block (15) is threaded on the outside of the lead screw (16) in the through groove (3). The cutting blade (8) is detachably connected to the surface of the moving block (15) by bolts.

4. The PVC flame-retardant film tape cutting device according to claim 1, characterized in that, The surface of the processing table (1) is engraved with scale lines (2) for measuring the cutting length of the film tape.

5. A PVC flame-retardant film tape cutting device according to claim 1, characterized in that, The processing table (1) is symmetrically fixed with support frames (5) on both sides of one end near the film tape roll (6), and each of the two support frames (5) has a connecting groove (7) at one end.

6. The PVC flame-retardant film tape cutting device according to claim 1, characterized in that, Both sides of the same end of the inner cavity of the pressure plate (4) and the through groove (3) are provided with arc-shaped grooves (10), and the two arc-shaped grooves (10) on the pressure plate (4) and the through groove (3) correspond to each other.

7. The PVC flame-retardant film tape cutting device according to claim 1, characterized in that, The end of the through groove (3) near the pressure plate (4) is coplanar with the side end of the pressure plate (4), and one end of the cutting blade (8) is movably attached to the pressure plate (4).

8. A PVC flame-retardant film tape cutting device according to claim 1, characterized in that, The bottom of the end of the pressure plate (4) away from the through groove (3) is a chamfer, and the angle of the chamfer is 30°.

9. A PVC flame-retardant film tape cutting device according to claim 3, characterized in that, The outer sides of the lead screws (16) on both sides of the movable block (15) are fitted with telescopic bellows (17), and the two ends of the two telescopic bellows (17) are respectively connected to the inner cavity of the through groove (3) and the side end of the movable block (15).

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