An upper and lower opening and closing type chain gripper device of a high-speed bidirectional stretch film production line and a method of using the same

Abstract

The application provides a high-speed bidirectional stretching film production line upper and lower opening and closing type chain tong device and a use method thereof, and relates to the technical field of film production. The device comprises a tong seat, a tong handle and a driving assembly. The tong seat is provided with a clamping cavity and a mounting bin. The clamping cavity is arranged at one end of the tong seat and extends along the running direction of the production line. The mounting bin penetrates the other end of the tong seat and is in communication with the clamping cavity. The tong handle is slidingly arranged in the mounting bin, and one end of the tong handle extends into the clamping cavity to form a clamping plate. The driving assembly is arranged at the end of the tong handle away from the clamping plate. The driving assembly is used for driving the tong handle to move away from or close to the clamping cavity. The application can increase the contact area of the tong handle and the film, reduce the concentrated force on the film, eliminate the transverse component force generated by the rotation opening and closing, and reduce the vibration and noise in the opening and closing process.

Description

Technical Field

[0001] This invention relates to the field of film production technology, specifically to an upper and lower opening and closing chain clamp device for a high-speed biaxially stretched film production line and its usage method. Background Technology

[0002] Biaxially oriented film is a very important type of flexible packaging material, widely used in the packaging of food, candy, cigarettes, tea, juice, milk, textiles, etc., due to its high tensile strength, impact strength, rigidity, toughness, and good transparency. my country's film production line level lags behind international standards. To improve the competitiveness of domestic biaxially oriented film production lines, Chinese manufacturers are constantly updating equipment and technology. The chain clamp device is the core component of the biaxially oriented film production line, used to clamp the film edges and drive it to complete the stretching process. Its opening and closing stability directly affects the stretching quality of the film and the production line's operating efficiency. The chain clamp device is usually installed on a high-speed running guide rail, achieving film clamping and release through opening and closing actions. Current technologies mostly adopt a rotating opening and closing structure.

[0003] A Chinese patent, authorized under publication number CN222080046U, entitled "A Chain Clamp for a Scratch-Resistant Film Stretching Production Line," describes a device comprising a clamp base, a clamp handle, a rotating shaft, and a self-locking mechanism. The opening and closing action is achieved by the rotation of the clamp handle around the rotating shaft, and self-locking is accomplished by spring preload, thus solving the problem of insufficient clamping force in traditional chain clamps. However, the aforementioned rotating opening and closing chain clamp device still has the following drawbacks in practical applications:

[0004] 1. When the clamp handle rotates to open and close, it makes an arc-shaped motion, generating a lateral component force, which causes large fluctuations in the film clamping force, making the film prone to slippage or edge damage, affecting the stretching accuracy;

[0005] 2. The concentrated impact energy at the end of the rotation results in large vibration amplitude and high operating noise of the chain clip, which not only shortens the service life of the chain clip but also affects the overall stability of the production line;

[0006] In response to the above situation, we will innovate the existing rotating and opening chain clamp by designing an upper and lower opening and closing structure to solve the existing problems. Summary of the Invention

[0007] The present invention aims to solve at least one of the above-mentioned technical problems by providing an upper and lower opening and closing chain clamp device for a high-speed biaxial stretching film production line, which can increase the contact area between the clamp handle and the film, reduce the concentrated force on the film, eliminate the lateral component force generated by the rotation opening and closing, and reduce the vibration and noise during the opening and closing process.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A top-and-bottom opening chain clamp device for a high-speed biaxially oriented film production line includes a clamp base, a clamp handle, and a drive assembly. The clamp base has a clamping cavity and an mounting chamber. The clamping cavity is located at one end of the clamp base and extends along the running direction of the production line. The mounting chamber passes through the other end of the clamp base and communicates with the clamping cavity. The clamp handle is slidably disposed in the mounting chamber, and one end of the clamp handle extends into the clamping cavity to form a clamping plate. The drive assembly is installed at the end of the clamp handle away from the clamping plate, and the drive assembly is used to drive the clamp handle to move in a direction away from or towards the clamping cavity.

[0010] Furthermore, the drive assembly includes two electromagnetic blocks and a control system. One electromagnetic block is installed at the end of the clamp handle away from the clamping plate, and the other electromagnetic block is installed on the side of the clamp seat away from the clamping cavity. The two electromagnetic blocks are opposite to each other. The control system is connected to both electromagnetic blocks to control the magnetic poles of the two electromagnetic blocks to be the same or opposite.

[0011] Furthermore, it includes a self-locking mechanism, which is a bistable spring assembly comprising a piston cylinder, a spring, a piston, and a movable connecting rod. The piston cylinder is fixed to the middle of the inner side of the clamp seat. The spring is located inside the piston cylinder, and one end of the spring is connected to the inner wall of the clamp seat. The piston is located at the end of the piston cylinder opposite to the inner wall of the clamp seat and is connected to the other end of the spring. One end of the movable connecting rod is connected to the piston, and the other end of the movable connecting rod is connected to the clamp handle.

[0012] Furthermore, it includes a guiding mechanism, which includes a guide rail and a slider. The guide rail is disposed on the inner wall of the clamp seat and extends along the height direction of the clamp seat. The slider is slidably disposed in the guide rail and fixed to the clamp handle.

[0013] Furthermore, the clamp handle also includes upper and lower plates and a magnet plate. The upper and lower plates extend along the running direction of the vertical production line. The clamping plate is connected to one end of the upper and lower plates facing the clamping cavity and extends along the running direction of the production line. The magnet plate is connected to one end of the upper and lower plates away from the clamping plate. The drive assembly is mounted on the magnet plate.

[0014] Furthermore, there are two installation chambers, which are arranged sequentially along the running direction of the production line, and the clamping cavities corresponding to the two installation chambers are interconnected; one of the installation chambers is equipped with a clamping handle.

[0015] Furthermore, the clamping base includes a back plate, a bottom plate, a top plate, an end plate, and a spacer plate. The bottom plate and the top plate are mounted on opposite sides of the back plate and extend along the length of the back plate. The end plate is connected to the end of the back plate and is connected to the top plate. The spacer plate is located between the two end plates and is connected to the top plate. The mounting compartment passes through the top plate.

[0016] Furthermore, it also includes a mounting base connected to the side of the clamp seat opposite to the mounting compartment.

[0017] Furthermore, the control system includes a photoelectric sensor, a thin-film sensor, an open-jaw module, a closed-jaw module, a distance sensor, and a control module;

[0018] Both the photoelectric sensor and the thin film sensor are mounted on the clamping plate. The photoelectric sensor is used to sense whether the clamping plate has clamped the thin film, and the thin film sensor is used to sense whether there is a thin film in the clamping cavity.

[0019] The locking module connects to the two electromagnetic blocks, and the locking module is used to control the magnetic poles of the two electromagnetic blocks to be opposite.

[0020] The locking module connects the two electromagnetic blocks, and the locking module is used to control the magnetic poles of the two electromagnetic blocks to be the same;

[0021] The distance sensor is mounted on the clamp holder and is used to sense the displacement changes of the clamp holder.

[0022] The control module is connected to the photoelectric sensor, the thin-film sensor, the open-clamp module, the closed-clamp module, and the distance sensor.

[0023] The present invention further provides a method for using the upper and lower opening and closing chain clamp device of the high-speed biaxially oriented film production line, comprising the following steps:

[0024] Device installation: Install the upper and lower opening and closing chain clamp device of the high-speed biaxially oriented film production line on the moving chain on the side of the high-speed biaxially oriented film production line.

[0025] Clamping the film: The driving assembly drives the clamp handle to move away from the clamping cavity. When it is determined that the film is located in the clamping cavity and corresponds to the clamping plate, the driving assembly drives the clamp handle to move closer to the clamping cavity, until the clamping plate clamps the film on the clamping base.

[0026] Release the film: When the stretching operation is completed, the drive assembly drives the clamping handle to move away from the clamping cavity, that is, release the film.

[0027] By adopting the above technical solution, the present invention has the following beneficial effects:

[0028] 1. Significantly improved clamping force stability: As the drive assembly drives the clamping handle to move away from or towards the clamping cavity, it can avoid contact with the film when the clamping plate is released, eliminating the lateral force generated by the rotation opening and closing, reducing the clamping force fluctuation amplitude, reducing the pressure difference at various points on the clamping surface, effectively avoiding film slippage and edge damage, and improving film stretching accuracy.

[0029] 2. Significantly reduced vibration and noise: The spring assembly of the self-locking mechanism can buffer the upper and lower opening and closing motion, reducing the peak impact force of the clamp and the operating noise, extending the service life of the chain clamp and guide rail, and improving the stability of the production line operation.

[0030] 3. Wider adaptability: By adjusting the preload of the bistable spring, it can adapt to the clamping requirements of films of different thicknesses and is compatible with high-speed production line conditions of 300-480m / min. Attached Figure Description

[0031] Figure 1 This is a first-view structural diagram of the top-and-bottom opening chain clamp device of a high-speed biaxially oriented film production line.

[0032] Figure 2 This is a second-view structural diagram of the top-and-bottom opening chain clamp device in a high-speed biaxially oriented film production line.

[0033] Figure 3 for Figure 2 A schematic diagram of the installation of the spring and piston.

[0034] Figure 4 This is a control diagram of the control system.

[0035] In the attached diagram, 1-clamping base, 11-clamping cavity, 12-mounting compartment, 13-back plate, 14-bottom plate, 15-top plate, 16-end plate, 17-spacer plate, 2-clamping handle, 20-clamping plate, 21-upper and lower plates, 22-magnetic plate, 3-drive assembly, 30-photoelectric sensor, 31-electromagnetic block, 32-film sensor, 33-clamping module, 34-clamping module, 35-distance sensor, 36-control module, 4-self-locking mechanism, 41-piston cylinder, 42-spring, 44-piston, 43-movable connecting rod, 51-guide rail, 52-slider, 6-mounting base. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or it may be centered within another component. When a component is described as "set to" another component, it can be directly set on the other component or it may be centered within another component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this article are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides an upper and lower opening and closing chain clamp device for a high-speed biaxially oriented film production line, including a clamp base 1, a clamp handle 2, and a drive assembly 3. The clamp base 1 has a clamping cavity 11 and an mounting chamber 12. The clamping cavity 11 is located at one end of the clamp base 1 and extends along the running direction of the production line. The mounting chamber 12 passes through the other end of the clamp base 1 and is connected to the clamping cavity 11. The clamp handle 2 is slidably disposed in the mounting chamber 12, and one end of the clamp handle 2 extends into the clamping cavity 11 to form a clamping plate 20. The drive assembly 3 is installed at the end of the clamp handle 2 away from the clamping plate 20, and the drive assembly 3 is used to drive the clamp handle 2 to move away from or towards the clamping cavity 11.

[0040] In this embodiment, the clamp holder 1 includes a back plate 13, a bottom plate 14, a top plate 15, an end plate 16, and a spacer plate 17. The back plate 13 extends along the running direction of the production line. The bottom plate 14 and the top plate 15 are mounted on opposite sides of the back plate 13 and extend along the length of the back plate 13. The end plate 16 is connected to the end of the back plate 13 and to the top plate 15. The spacer plate 17 is located between the two end plates 16 and is connected to the top plate 15, so as to form the aforementioned clamping cavity 11 below the two end plates 16 and the spacer plate 17 facing the bottom plate 14. The spacer plate 17 and the remaining plates enclose the aforementioned mounting chamber 12. Specifically, there are two mounting chambers 12, which are arranged sequentially along the running direction of the production line. The clamping cavities 11 corresponding to the two mounting chambers 12 are interconnected. A clamp handle 2 is installed in one mounting chamber 12. The mounting chamber 12 penetrates the top plate 15.

[0041] In this embodiment, the drive assembly 3 includes two electromagnetic blocks 31 and a control system. One electromagnetic block 31 is mounted on the end of the clamp handle 2 away from the clamping plate 20, and the other electromagnetic block 31 is mounted on the side of the clamp base 1 away from the clamping cavity 11. The two electromagnetic blocks 31 correspond to each other. Specifically, the upper electromagnetic block 31 is fixed above the production line guide rail by a bracket, and the lower electromagnetic block 31 is embedded in the upper part of the clamp handle 2. The control system is connected to both electromagnetic blocks 31 to control whether the magnetic poles of the two electromagnetic blocks 31 are the same or opposite. When it is necessary to open the clamp, the control system controls the magnetic poles of the two electromagnetic blocks 31 to be opposite. Due to the upward force of the magnetic force, the clamp handle 2 moves upward, realizing the opening of the clamp. When it is necessary to close the clamp, the control system controls the magnetic poles of the two electromagnetic blocks 31 to be the same. Due to the downward force of the magnetic force, the two electromagnetic blocks 31 separate, and under the action of their own weight, the clamp handle 2 moves downward, closing with the base plate 14, thereby clamping the film.

[0042] In this embodiment, the clamp handle 2 further includes upper and lower plates 21 and a magnetic plate 22. The upper and lower plates 21 extend along the running direction of the vertical production line, and the clamping plate 20 connects to the end of the upper and lower plates 21 facing the clamping cavity 11 and extends along the running direction of the production line. The magnetic plate 22 connects to the end of the upper and lower plates 21 away from the clamping plate 20 and is perpendicular to the upper and lower plates 21. The drive assembly 3 is mounted on the magnetic plate 22, specifically, an electromagnetic block 31 is embedded in the magnetic plate 22. The clamp handle 2 is integrally formed in a simple "I" shape. This structure is simple and lightweight, and the magnetic force of the two electromagnetic blocks 31 can effectively realize the up and down movement of the clamp handle 2. This not only eliminates the complex mechanical transmission process, but also reduces the peak force of the clamping impact and reduces the operating noise.

[0043] In this embodiment, the top-and-bottom opening chain clamp device of the high-speed biaxially oriented film production line includes a self-locking mechanism 4. The self-locking mechanism 4 is a bistable spring assembly, including a piston cylinder 41, a spring 42, a piston 44, and a movable connecting rod 43. The piston cylinder 41 is welded and fixed to the middle of the inner side of the clamp seat 1. The spring 42 is located inside the piston cylinder 41, and one end of the spring 42 is connected to the inner wall of the clamp seat 1. The piston 44 is located at the end of the piston cylinder 41 away from the inner wall of the clamp seat 1 and is connected to the other end of the spring 42. One end of the movable connecting rod 43 is connected to the piston 44, and the other end of the movable connecting rod 43 is connected to the clamp handle 2. When the clamp handle 2 closes downward to the preset position, the preload of the spring 42 pushes the movable connecting rod 43 to act on the clamp handle 2. Due to the force of the spring 42 acting on the weight of the clamp handle 2, self-locking is achieved, ensuring stable clamping force.

[0044] In this embodiment, the upper and lower opening and closing chain clamp device of the high-speed biaxially oriented film production line includes a guiding mechanism, which includes a guide rail 51 and a slider 52. The guide rail 51 is disposed on the inner wall of the clamp base 1 and extends along the height direction of the clamp base 1. Specifically, a guide rail 51 is installed on the opposite side of the end plate 16 and the spacer plate 17, and the guide rail 51 extends along the height direction of the spacer plate 17. The slider 52 is slidably disposed in the guide rail 51 and fixed to the clamp handle 2. Specifically, a slider 52 is slidably disposed in each of the two guide rails 51, and both sliders 52 are fixedly welded to the upper and lower plates 21. When the clamp handle 2 moves up and down, the slider 52 moves linearly under the limit of the guide rail 51, which can ensure that the clamp handle 2 can only move up and down in the vertical direction without lateral deviation.

[0045] In this embodiment, the upper and lower opening and closing chain clamp device of the high-speed biaxial stretching film production line also includes a mounting base 6. The mounting base 6 is connected to the side of the clamp seat 1 away from the mounting chamber 12. The mounting base 6 is a chain mounting base in the prior art, which is used to fix the clamp seat 1 on the chain of the production line.

[0046] In this embodiment, the control system includes a photoelectric sensor 30, a thin-film sensor 32, an opening clamping module 33, a closing clamping module 34, a distance sensor 35, and a control module 36. Both the photoelectric sensor 30 and the thin-film sensor 32 are mounted on the clamping plate 20. The photoelectric sensor 30 senses whether the clamping plate 20 has clamped the thin film, and the thin-film sensor 32 senses whether there is a thin film inside the clamping cavity 11. The opening clamping module 33 connects to two electromagnetic blocks 31 and controls the magnetic poles of the two electromagnetic blocks 31 to be opposite. The closing clamping module 34 connects to the two electromagnetic blocks... 31. The clamping module 34 is used to control the magnetic poles of the two electromagnetic blocks 31 to be the same; the distance sensor 35 is installed on the clamping base 1 and is used to sense the displacement changes of the clamping base 1; the control module 36 is connected to the photoelectric sensor 30, the thin film sensor 32, the clamping module 33, the clamping module 34 and the distance sensor 35. The control module 36 is used to collect and integrate the data of the thin film sensor 32 and the distance sensor 35 and generate corresponding control commands, and realize the magnetic pole control of the two electromagnetic blocks 31 through the clamping module 33 and the clamping module 34.

[0047] This embodiment also provides a method for using the upper and lower opening and closing chain clamp device of the high-speed biaxially oriented film production line, including the following steps:

[0048] S1 Device Installation: Install the upper and lower opening chain clamp device of the high-speed biaxially oriented film production line on the moving chain on the side of the high-speed biaxially oriented film production line. Specifically, fix the mounting base 6 on the chain of the production line.

[0049] S2 Clamping the film: The drive assembly 3 drives the clamp handle 2 to move away from the clamping cavity 11. Specifically, the clamping module 33 controls the magnetic poles of the two electromagnetic blocks 31 to be opposite, and the two electromagnetic blocks 31 attract each other. The electromagnetic block 31 mounted on the magnetized plate 22 drives the clamp handle 2 to move away from the clamping cavity 11 and magnetically engage with the other electromagnetic block 31. During this process, the up-and-down opening and closing chain clamp device remains in the open state under the action of the self-locking mechanism 4. When it is determined that the film is located in the clamping cavity 11 and corresponds to the clamping plate 20, the drive assembly 3 drives the clamp handle 2. The clamping plate 20 clamps the film onto the clamping base 1 by moving towards the clamping cavity 11. Specifically, the film sensor 32 senses that there is a film in the clamping cavity 11. The clamping module 34 controls the magnetic poles of the two electromagnetic blocks 31 to be the same. The two electromagnetic blocks 31 separate from each other under the action of magnetic force. The electromagnetic blocks 31 mounted on the magnet plate 22 drive the clamping handle 2 to move towards the clamping cavity 11 and make the clamping plate 20 abut against the base plate 14. During this process, the clamping handle 2 is closed with the base plate 14 under its own weight and the preload force of the spring 42.

[0050] S3 Release the film: When the stretching operation is completed, the distance sensor 35 senses that the clamp 1 has moved a preset distance. Specifically, the chain drives the clamp 1 to move through the mounting base 6 to achieve the film stretching operation. During this process, when the clamping plate 20 abuts against the base plate 14, the photoelectric sensor 30 can obtain the signal that the film has been clamped and feed it back to the control module 36. The control module 36 controls the distance sensor 35 to start sensing the clamp 1 and then start moving to the distance to complete the film stretching operation, which is the preset distance. The method and steps of the chain driving the clamp 1 to move through the mounting base 6 are the same as the method and steps of the film stretching operation in the prior art, and will not be repeated here. The drive assembly 3 drives the clamp handle 2 to move away from the clamping cavity 11, that is, to release the film. Specifically, the clamp opening module 33 controls the magnetic poles of the two electromagnetic blocks 31 to be opposite, and the two electromagnetic blocks 31 attract each other. The electromagnetic block 31 mounted on the magnet plate 22 drives the clamp handle 2 to move away from the clamping cavity 11 and magnetizes with the other electromagnetic block 31.

[0051] To verify the vibration reduction effect of the top-and-bottom opening chain clamp of this invention, a comparative vibration test was conducted on a traditional rotating chain clamp (old hinge) and the top-and-bottom opening chain clamp of this invention (new hinge). The test speeds were set to 50, 100, and 150 m / min, and the guide rail condition, sensor installation position, and data acquisition parameters were kept consistent for both types of chain clamps during the test. The vibration test results of the two types of chain clamps at different operating speeds are shown in the table below.

[0052] Table 1. Time-domain values ​​of the old and new chain links

[0053]

[0054] Table 2 Changes in the old and new chain clips

[0055]

[0056] Table 3 Comparison of Key Evaluation Indicators between New and Old Chain Clips

[0057]

[0058] The Z-direction is the transverse stretching direction of the film and also the main direction of the tangential action on the film edge during chain clamping. Therefore, its vibration response is closely related to the safety of film operation. During transverse stretching, the film is under high tension. When the chain clamp generates Z-direction vibration or impact, the additional tangential load will superimpose with the original transverse stretching load, forming local stress concentration at the film edge. When the transient stress exceeds the local bearing capacity of the film, it easily induces film edge slippage, shear damage, and crack propagation. Therefore, compared with the X-direction, which mainly reflects the vertical opening and closing impact of the chain clamp, Z-direction vibration can more directly reflect the impact of chain clamp movement on the transverse stability of the film and the risk of film rupture. As can be seen from Table 1-2, the Z-direction vibration of the up-and-down opening chain clamp of this invention was reduced under various speed conditions in the experiment, consistent with the result of a significant decrease in the maximum tangential contact force in the finite element analysis. This further indicates that the structure can reduce transverse disturbance and tangential action at the film edge, thereby reducing the risk of film rupture.

[0059] With increasing operating speed, the X-axis (vertical) and Z-axis (tangential) vibrations of both types of chain clips generally showed an increasing trend. The peak X-axis acceleration of the traditional rotary chain clip increased from 0.823 m / s² at 50 m / min to 2.089 m / s² at 150 m / min, while that of the top-and-bottom opening chain clip increased from 0.889 m / s² to 1.800 m / s². At 100 and 150 m / min, the peak X-axis acceleration of the top-and-bottom opening chain clip was reduced by 14.3% and 13.8% respectively compared to the traditional structure, indicating that the top-and-bottom opening structure can effectively reduce the vertical impact generated by the opening and closing of the chain clip at medium and high speeds. The Z-axis vibration was reduced at all three speed conditions. At speeds of 50, 100, and 150 m / min, the peak value in the Z-direction of the vertically opening and closing chain clamp was reduced by 9.2%, 5.4%, and 11.4% respectively compared to the traditional structure. This indicates that changing the clamp handle from a rotating opening and closing mechanism to a vertically opening and closing mechanism can reduce the dynamic response of the chain clamp in the tangential direction, which is consistent with the trend of the aforementioned tangential contact force simulation results.

[0060] The time-domain results show that the top-and-bottom opening chain clip has a good vibration reduction effect under medium- and high-speed conditions, and can reduce the vertical and tangential impact response and the main periodic vibration components. The experimental results are consistent with the decreasing trend of the peak acceleration obtained from the finite element analysis, verifying the effectiveness of the top-and-bottom opening structure and parameter optimization scheme.

[0061] As shown in Table 3, compared with the traditional rotating chain clamp, the top-and-bottom opening chain clamp reduces structural stress, opening and closing clamp impact, and membrane edge tangential contact force by changing the clamp handle's movement mode. Although the initial top-and-bottom opening structure had a large contact force fluctuation problem, this defect was significantly improved after parameter optimization. The optimized top-and-bottom opening chain clamp reduced the maximum equivalent stress, peak acceleration, contact force fluctuation amplitude, and maximum tangential contact force by 40.57%, 43.85%, 22.38%, and 93.28% respectively compared with the traditional structure, demonstrating better structural safety, motion smoothness, and membrane clamping stability. Although its first-order natural frequency is still slightly lower than that of the traditional structure, it has rebounded after optimization, and the overall dynamic performance has been improved. In summary, the optimized top-and-bottom opening chain clamp can significantly reduce the closing clamp impact and membrane edge tangential action while ensuring structural stability, and its overall performance is superior to that of the traditional rotating chain clamp.

[0062] In summary, the upper and lower opening and closing chain clamp device and its usage method in the high-speed biaxially oriented film production line described in this embodiment can achieve the following technical effects:

[0063] 1. Significantly improved clamping force stability: As the drive assembly 3 drives the clamp handle 2 to move away from or towards the clamping cavity 11, it can avoid contact with the film when the clamping plate 20 is released, eliminating the lateral component force generated by the rotation opening and closing, reducing the clamping force fluctuation amplitude, reducing the pressure difference at various points on the clamping surface, effectively avoiding film slippage and edge damage, and improving film stretching accuracy.

[0064] 2. Vibration and noise are significantly reduced: The end of the opening and closing motion can be buffered by the spring assembly of the self-locking mechanism 4, which reduces the peak force of the closing clamp impact and the operating noise, extends the service life of the chain clamp and guide rail, and improves the stability of the production line operation.

[0065] 3. Wider adaptability: By adjusting the preload of the bistable spring, it can adapt to the clamping requirements of films of different thicknesses and is compatible with high-speed production line conditions of 300-480m / min.

[0066] The above description is a detailed description of the preferred embodiments of the present invention. However, the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications made under the technical spirit of the present invention should fall within the patent scope covered by the present invention.

Claims

1. A top-and-bottom opening and closing chain clamp device for a high-speed biaxially oriented film production line, characterized in that: The assembly includes a clamp base (1), a clamp handle (2), and a drive assembly (3). The clamp base (1) has a clamping cavity (11) and an installation chamber (12). The clamping cavity (11) is located at one end of the clamp base (1) and extends along the running direction of the production line. The installation chamber (12) passes through the other end of the clamp base (1) and is connected to the clamping cavity (11). The clamp handle (2) is slidably disposed in the installation chamber (12), and one end of the clamp handle (2) extends into the clamping cavity (11) to form a clamping plate (20). The drive assembly (3) is installed at the end of the clamp handle (2) away from the clamping plate (20). The drive assembly (3) is used to drive the clamp handle (2) to move in a direction away from or close to the clamping cavity (11).

2. The upper and lower opening and closing chain clamp device of a high-speed biaxially oriented film production line as described in claim 1, characterized in that: The drive assembly (3) includes two electromagnetic blocks (31) and a control system. One electromagnetic block (31) is installed at the end of the clamp handle (2) away from the clamping plate (20), and the other electromagnetic block (31) is installed on the side of the clamp seat (1) away from the clamping cavity (11). The two electromagnetic blocks (31) correspond to each other. The control system is connected to both electromagnetic blocks (31) to control the magnetic poles of the two electromagnetic blocks (31) to be the same or opposite.

3. The upper and lower opening and closing chain clamp device of a high-speed biaxially oriented film production line as described in claim 1, characterized in that: The assembly includes a self-locking mechanism (4), which is a bistable spring assembly, comprising a piston cylinder (41), a spring (42), a piston (44), and a movable connecting rod (43). The piston cylinder (41) is fixed to the middle of the inner side of the clamp seat (1). The spring (42) is located inside the piston cylinder (41), and one end of the spring (42) is connected to the inner wall of the clamp seat (1). The piston (44) is located at one end of the piston cylinder (41) away from the inner wall of the clamp seat (1) and is connected to the other end of the spring (42). One end of the movable connecting rod (43) is connected to the piston (44), and the other end of the movable connecting rod (43) is connected to the clamp handle (2).

4. The upper and lower opening and closing chain clamp device of a high-speed biaxially oriented film production line as described in claim 3, characterized in that: The guide mechanism includes a guide rail (51) and a slider (52). The guide rail (51) is disposed on the inner wall of the clamp seat (1) and extends along the height direction of the clamp seat (1). The slider (52) is slidably disposed in the guide rail (51) and fixed to the clamp handle (2).

5. The upper and lower opening and closing chain clamp device of a high-speed biaxially oriented film production line as described in claim 1, characterized in that: The clamp handle (2) also includes upper and lower plates (21) and a magnet plate (22). The upper and lower plates (21) extend along the running direction of the vertical production line. The clamping plate (20) is connected to the end of the upper and lower plates (21) facing the clamping cavity (11) and extends along the running direction of the production line. The magnet plate (22) is connected to the end of the upper and lower plates (21) away from the clamping plate (20). The drive assembly (3) is mounted on the magnet plate (22).

6. The upper and lower opening and closing chain clamp device of a high-speed biaxially oriented film production line as described in claim 1, characterized in that: There are two installation chambers (12), which are arranged sequentially along the running direction of the production line. The clamping cavities (11) corresponding to the two installation chambers (12) are interconnected. A clamp handle (2) is installed in one of the installation chambers (12).

7. The upper and lower opening and closing chain clamp device of a high-speed biaxially oriented film production line as described in claim 1, characterized in that: The clamping base (1) includes a back plate (13), a bottom plate (14), a top plate (15), an end plate (16), and a spacer plate (17). The bottom plate (14) and the top plate (15) are installed on opposite sides of the back plate (13) and extend along the length of the back plate (13). The end plate (16) is connected to the end of the back plate (13) and connected to the top plate (15). The spacer plate (17) is located between the two end plates (16) and connected to the top plate (15). The mounting compartment (12) passes through the top plate (15).

8. The upper and lower opening and closing chain clamp device of a high-speed biaxially oriented film production line as described in claim 2, characterized in that: It also includes a mounting base (6) connected to the side of the clamp seat (1) away from the mounting chamber (12).

9. The upper and lower opening and closing chain clamp device of a high-speed biaxially oriented film production line as described in claim 8, characterized in that: The control system includes a photoelectric sensor (30), a thin-film sensor (32), an open-jaw module (33), a closed-jaw module (34), a distance sensor (35), and a control module (36). The photoelectric sensor (30) and the thin film sensor (32) are both mounted on the clamping plate (20). The photoelectric sensor (30) is used to sense whether the clamping plate (20) has clamped the thin film, and the thin film sensor (32) is used to sense whether there is a thin film in the clamping cavity (11). The locking module (33) connects the two electromagnetic blocks (31), and the locking module (33) is used to control the magnetic poles of the two electromagnetic blocks (31) to be opposite. The locking module (34) connects the two electromagnetic blocks (31), and the locking module (34) is used to control the magnetic poles of the two electromagnetic blocks (31) to be the same; The distance sensor (35) is mounted on the clamp base (1) and is used to sense the displacement changes of the clamp base (1); The control module (36) is connected to the photoelectric sensor (30), the thin film sensor (32), the open-jaw module (33), the closed-jaw module (34), and the distance sensor (35).

10. The method of using the upper and lower opening and closing chain clamp device of the high-speed biaxial stretching film production line as described in claim 1, characterized in that, Includes the following steps: Device installation: Install the upper and lower opening and closing chain clamp device of the high-speed biaxially oriented film production line on the moving chain on the side of the high-speed biaxially oriented film production line. Clamping the film: The driving assembly (3) drives the clamp handle (2) to move away from the clamping cavity (11). When it is determined that the film is located in the clamping cavity (11) and corresponds to the clamping plate (20), the driving assembly (3) drives the clamp handle (2) to move closer to the clamping cavity (11) until the clamping plate (20) clamps the film on the clamping seat (1). Release the film: When the stretching operation is finished, the drive assembly (3) drives the clamp (2) to move away from the clamping cavity (11), that is, release the film.

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