Tension control assembly suitable for film conveying process

Abstract

The utility model discloses a tension control assembly suitable for a thin film conveying process. The tension control assembly comprises a traction roller assembly and a gravity roller assembly which are sequentially arranged in the thin film conveying direction. The gravity roller assembly comprises a first guide roller, a gravity roller and a second guide roller which are sequentially arranged in the film conveying direction. The height position of the gravity roller is lower than that of the first guide roller and that of the second guide roller. The gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain or are respectively arranged on two closed chains through a synchronous transmission mechanism; a displacement detection device is arranged on the gravity roller or the gravity roller counterweight mechanism or the synchronous transmission mechanism, and is used for notifying the system to adjust the rotating speed of the traction roller assembly after detecting the displacement change. According to the scheme, tension required by a specific process can be flexibly provided, and a thin film is prevented from being pulled and damaged due to overlarge tension; wherein the traction roller assembly cuts off tension, then constant tension is applied to the thin film through the gravity roller assembly by means of gravity, and the tension can be adjusted based on the displacement detection device.

Description

Technical Field

[0001] The utility model belongs to the technical field of film production equipment, and in particular relates to a tension control component suitable for a film conveying process. Background Art

[0002] Currently, film production typically utilizes a multi-roller system for continuous conveying, with various roller assemblies used to flatten and stretch the film. Precise tension control is generally not required for equipment such as winders and annealing furnaces. However, in the stripping chamber for cast film, for example, polyimide film, achieving a certain degree of longitudinal stretching within the stripping chamber places high demands on the film's tension. Existing solutions, such as the use of floating rollers driven by cylinders to apply force to the film, make it difficult to control tension and exhibit limited adjustment accuracy, failing to meet the demands of current high-end film production processes. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a tension control component suitable for the film conveying process, which solves the problem that the existing solution is difficult to accurately control the tension. During the film conveying process, the tension is firstly interrupted, and then longitudinal micro-stretching is performed, and the stretching condition is controllable and easy to adjust.

[0004] According to the technical solution of the present invention, the present invention provides a tension control component suitable for use in a film conveying process, characterized in that it comprises a traction roller assembly and a gravity roller assembly sequentially arranged along the film conveying direction; the gravity roller assembly comprises a first guide roller, a gravity roller and a second guide roller sequentially arranged along the film conveying direction, and the height position of the gravity roller is lower than that of the first guide roller and the second guide roller; the gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain or are respectively arranged on two closed chains through a synchronous transmission mechanism; a displacement detection device is provided on the gravity roller or the gravity roller counterweight mechanism or the synchronous transmission mechanism, and the displacement detection device is used to notify the system to adjust the rotation speed of the traction roller assembly after detecting a displacement change.

[0005] In some embodiments, the gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain; the closed chain is in a vertically arranged ring, and the closed chain transmission is connected to the sprockets located at its upper and lower ends; the closed chain is connected to a floating block and a gravity roller counterweight mechanism, and the gravity roller is rotatably connected to the floating block.

[0006] In other embodiments, the closed chain includes a roller chain and a counterweight chain, and the gravity roller and the gravity roller counterweight mechanism are respectively arranged on the roller chain and the counterweight chain; the roller chain is in a vertically arranged ring shape, and the roller chain transmission is connected to the roller sprockets located at its upper and lower ends; the roller chain is connected to a floating block, and the gravity roller is rotatably connected to the floating block; the synchronous transmission mechanism includes a gravity roller synchronous shaft, and the upper and / or lower roller sprockets are coaxially connected to the counterweight sprocket through the gravity roller synchronous shaft, and the counterweight sprocket is transmission-connected to the counterweight chain; the counterweight chain is in a vertically arranged ring shape, and the counterweight chain is connected to the gravity roller counterweight mechanism.

[0007] Furthermore, the counterweight chain is located outside the roller chain.

[0008] Furthermore, it also includes a vertically arranged gravity roller slide rail, and the floating block is slidingly connected to the gravity roller slide rail in a matching manner.

[0009] Furthermore, both ends of the gravity roller in the length direction are connected to the two floating blocks respectively; in the length direction of the gravity roller, relative to the midpoint of the gravity roller length, the gravity roller assembly has a mirror-symmetrical structure.

[0010] In some embodiments, the traction roller assembly includes a first active traction roller and a second active traction roller arranged adjacent to each other, with a gap between the first active traction roller and the second active traction roller, and the film conveying path is an S-shaped structure at the first active traction roller and the second active traction roller.

[0011] Furthermore, the second active traction roller is located below or obliquely below the downstream side of the first active traction roller, and the first guide roller is located above or obliquely above the downstream side of the second active traction roller.

[0012] In other embodiments, the traction roller assembly includes a third active traction roller and a tension isolation pressure roller arranged adjacent to each other, the tension isolation pressure roller is a driven roller, the third active traction roller and the tension isolation pressure roller are respectively located on both sides of the film conveying path, and the film conveying path is tangent to the third active traction roller and the tension isolation pressure roller.

[0013] Furthermore, the tension isolation pressure roller is connected to a pressing control mechanism.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0015] The utility model is applicable to the tension control component in the film conveying process, which can achieve better tension control and adjustment effects, can be applied to the cast film stripping chamber, flexibly provide the tension required for the specific process, and prevent excessive tension from stretching and damaging the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a structural schematic diagram of a tension control assembly according to an embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of a gravity roller assembly according to an embodiment of the present utility model.

[0018] Figure 3 yes Figure 2 The main structural diagram of the gravity roller assembly is shown.

[0019] Figure 4 yes Figure 2 The right side structural schematic diagram of the gravity roller assembly is shown.

[0020] Figure 5a and Figure 5b It is a force analysis principle diagram of two implementation methods in the utility model.

[0021] Figure 6 It is a structural schematic diagram of a multi-roller system with a tension control component according to an embodiment of the present invention.

[0022] Figure 7 It is a structural schematic diagram of a multi-roller system with a tension control component according to another embodiment of the present invention.

[0023] Figure 8 yes Figure 7 A schematic structural diagram of the tension control assembly in the illustrated embodiment.

[0024] Description of reference numerals in the accompanying drawings:

[0025] 11. First guide roller; 12. Second guide roller; 21. First active traction roller; 22. Second active traction roller; 23. Third active traction roller; 24. Tension-breaking pressure roller; 3. Gravity roller; 31. Gravity roller slide rail; 32. Roller sprocket; 33. Roller chain; 34. Floating block; 35. Gravity roller synchronization shaft; 36. Counterweight sprocket; 37. Counterweight chain; 38. Gravity roller counterweight mechanism; 39. Wire encoder. DETAILED DESCRIPTION

[0026] The utility model provides a tension control component suitable for the film conveying process, which solves the problem that the existing solution is difficult to accurately control the tension. During the film conveying process, the tension is firstly cut off and then longitudinal micro-stretching is performed, and the stretching condition is controllable and easy to adjust.

[0027] See also Figure 1In one embodiment of the present invention, a tension control assembly suitable for use in film conveying is provided in a multi-roller system and mounted on a frame. The assembly includes a traction roller assembly and a gravity roller assembly sequentially arranged along the film conveying direction. The traction roller in the traction roller assembly is an active roller, which is driven by a motor to rotate and provide driving force for film conveying. The traction roller is also equipped with a pressure roller, for example, to separate the front and rear tensions. The gravity roller assembly is used to adjust the tension and perform micro-longitudinal stretching. The main principle is to provide constant tension through gravity or other means through a tension control mechanism. The tension control mechanism causes the gravity roller 3 to pull and stretch the film downward at a constant tension, and the constant tension is adjustable.

[0028] The gravity roller assembly includes a first guide roller 11, a gravity roller 3, and a second guide roller 12, which are arranged in sequence along the film conveying direction. The gravity roller 3 is lower than the first guide roller 11 and the second guide roller 12. The gravity roller 3 is a driven roller. The position of the gravity roller 3 is movable and connected to the gravity roller counterweight mechanism 38. The film conveying path and direction are as follows: Figure 1 As shown, after the film passes through the traction roller assembly, it is stretched downward to a certain extent by the gravity roller in the gravity roller assembly. A displacement detection device is also included. The displacement detection device is located in the gravity roller assembly or on the downstream side of the gravity roller assembly. The displacement detection device is used to notify the system to adjust the rotation speed of the traction roller assembly after detecting a displacement change, thereby achieving timely feedback or automatic system adjustment to ensure the desired tension effect.

[0029] More specifically, see Figures 2 to 4 The gravity roller assembly includes a gravity roller 3 and a gravity roller counterweight mechanism. The gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on the same closed chain, or are respectively arranged on two closed chains through a synchronous transmission mechanism (in other words, the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on different closed chains, with a larger spatial spacing, while still having a synchronous transmission relationship for operation). A displacement detection device is provided on the gravity roller or the gravity roller counterweight mechanism or the synchronous transmission mechanism. Among them, the closed chain is an annular chain that can transmit rotation on the annular path. The closed chain forms a structure similar to a fixed pulley (or a lever structure). Furthermore, the gravity roller 3 and the gravity roller counterweight mechanism 38 are located on the same side or on opposite sides of the fulcrum of the lever structure.

[0030] like Figure 5a As shown, when the gravity roller 3 and the gravity roller counterweight mechanism 38 are respectively located on the upstream side and the downstream side of the closed chain, the sum of the film tension F and the counterweight tension G1 of the gravity roller counterweight mechanism is balanced with the gravity G2 of the gravity roller, that is, the system resultant force = F + G1 - G2 = 0, so F = G2 - G1.

[0031] like Figure 5b As shown, when the gravity roller 3 and the gravity roller counterweight mechanism 38 are located on the same side of the closed chain, the sum of the counterweight tension G1 and the gravity roller gravity G2 is balanced with the film tension F, that is, the system force = F-G1-G2=0, so F=G1+G2.

[0032] In some embodiments, the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on the same closed chain; the closed chain is in a vertically arranged ring, and the closed chain transmission is connected to the sprockets located at its upper and lower ends; the closed chain is connected to the floating block 34 and the gravity roller counterweight mechanism, and the gravity roller 3 is rotatably connected to the floating block 34.

[0033] In other preferred embodiments, the closed chain includes a roller chain 33 and a counterweight chain 37, with the gravity roller 3 and the gravity roller counterweight mechanism 38 disposed on the roller chain 33 and the counterweight chain 37, respectively. The roller chain 33 is vertically arranged in an annular shape and is drivingly connected to roller sprockets 32 located at its upper and lower ends. Floating blocks 34 are connected to the roller chain 33, to which the gravity roller 3 is rotatably connected. The synchronous transmission mechanism includes a gravity roller synchronous shaft 35. The upper and / or lower roller sprockets 32 are coaxially connected to counterweight sprockets 36 via the gravity roller synchronous shaft 35. The counterweight sprockets 36 are drivingly connected to the counterweight chain 37. The counterweight chain 37 is vertically arranged in an annular shape and is connected to the gravity roller counterweight mechanism 38.

[0034] Preferably, a gravity roller rail 31 is vertically mounted on the frame. A floating block 34 is slidably connected to the gravity roller rail 31, thereby limiting the gravity roller 3 to only vertical motion and ensuring smooth vertical motion. It is understood that the gravity roller rail 31 can be used to provide auxiliary positioning, regardless of whether the gravity roller 3 and the gravity roller counterweight mechanism 38 are arranged on the same closed chain or on different closed chains.

[0035] In the illustrated embodiment, a gravity roller slide 31 is mounted on the frame of the multi-roller system. Upper and lower roller sprockets 32 are located near the upper and lower ends of the gravity roller slide 31, respectively, and are connected to a roller chain 33. The roller chain 33 is annular and has a floating block 34 on one straight segment. The floating block 34 is rotatably connected to the gravity roller 3, for example, via a bearing seat. This allows the gravity roller 3 to rotate about its central axis and its central axis to move up and down along with the floating block 34.

[0036] Preferably, only the upper roller sprocket 32 ​​is coaxially connected to the counterweight sprocket 36 via the gravity roller synchronization shaft 35. Furthermore, the counterweight sprockets 36 are preferably arranged in pairs, one above the other, in a corresponding arrangement. The upper counterweight sprocket corresponds to the upper roller sprocket and is coaxially connected to the gravity roller synchronization shaft 35, while the lower counterweight sprocket corresponds to the lower roller sprocket. Positioning the gravity roller synchronization shaft 35 at the top allows it to better function as a fixed pulley and aligns the shape and position of the roller chain 33 and the counterweight chain 37, contributing to a more stable synchronous transmission. In other embodiments, gravity roller synchronization shafts 35 are provided at both the upper and lower sides.

[0037] In this embodiment, the gravity roller counterweight mechanism 38 and the floating block 34 are located on different sides of the ring of the counterweight chain 37 and the roller chain 33. Here, "different sides" refers to the two straight segments in the ring chain structure (i.e., the relative "upward side" and "downward side"), such as Figure 4 As shown; because the longitudinal stretching tension required for the film is usually not large, the gravity of the gravity roller 3 can be "reduced" by the gravity roller counterweight mechanism 38 to achieve the required constant tension effect; of course, for example, for situations where a larger tension is required, it can be considered to set the gravity roller counterweight mechanism 38 on the same side of the floating block 34 and the gravity roller 3.

[0038] More specifically, because the length of the gravity roller 3 is greater than the film width and is typically longer, the two ends of the gravity roller 3 are connected to two floating blocks 34. Furthermore, the gravity roller assembly exhibits mirror-symmetry relative to the midpoint of the roller's length. This mirror-symmetry includes the consistency of the floating blocks 34 and the gravity roller counterweight mechanism 38 on both sides (including, for example, consistent mass and symmetrical position). In other words, the identical and symmetrical structures at both ends of the gravity roller 3 ensure uniform force distribution and alignment, thereby enabling uniform film stretching. Furthermore, preferably, the roller sprockets 32 and the counterweight sprocket 36 on both sides (the upper side) (a total of four sprockets) are coaxially connected via a gravity roller synchronization shaft 35, resulting in a more stable and simple structure.

[0039] Preferably, the counterweight chain 37 and counterweight sprocket 36 are located outside the roller chain 33 and roller sprocket 32. In a specific application, the gravity roller 3 is located within the film conveying area (such as a closed peeling chamber). This arrangement allows the gravity roller counterweight mechanism 38 to be located on the outside of the peeling chamber sidewall, creating an operating space for operators to easily adjust the gravity roller counterweight mechanism 38.

[0040] In some embodiments, the gravity roller counterweight mechanism 38 is a weight, such as a weight. The gravity applied by the gravity roller counterweight mechanism 38 can be varied by replacing weights of varying masses. In a preferred embodiment, the gravity roller counterweight mechanism 38 includes a removable gravity roller counterweight, such as a weight (adding weight), which can be installed or removed as needed to adjust the mass. Alternatively, other replaceable or adjustable counterweight methods can be employed. For example, the gravity roller counterweight mechanism 37 includes a horizontally arranged weight-adding support member (such as a circular tray), a vertical connecting rod fixedly connected to the middle of the weight-adding support member, and the lower portion of the weight-adding support member and the upper portion of the connecting rod are respectively connected to the counterweight chain 37 to form a ring. A weight-adding weight is detachably placed on the weight-adding support member, and one side of the weight-adding weight has an opening, and the connecting rod is located within the opening of the weight-adding weight. The weight-adding weight is, for example, a plurality of standard discs or pancakes, so that the total mass of the gravity roller counterweight mechanism 38 can be adjusted by adding or removing the weight. Furthermore, a positioning nut is threadedly mounted on the upper end of the connecting rod, which can be tightened to press the weight-adding weight below to prevent it from falling out.

[0041] The working principle of the gravity roller assembly of this solution is as follows. The roller sprocket 32 ​​and the counterweight sprocket 36 can only rotate synchronously. When the gravity roller counterweight mechanism 38 moves downward, the gravity roller 3 moves upward. The initial weight of the gravity roller is fixed. In the initial state, the roller is at the lower end. After the film is stretched, under the action of tension, the roller moves upward and the gravity roller counterweight mechanism 38 moves downward. Then, as Figure 5a And the above-mentioned force analysis can be adjusted to the required force balance state.

[0042] It is conceivable that the gravity roller counterweight mechanism is not limited to this. For example, in other embodiments, the gravity roller counterweight mechanism can also be selected as a hydraulic cylinder or a pneumatic cylinder, which is equivalent to replacing the gravity of the gravity roller counterweight mechanism 38 in the aforementioned embodiment with the force output by the hydraulic cylinder or the pneumatic cylinder.

[0043] Preferably, the displacement detection mechanism is a wire encoder 39 or a displacement sensor, which can directly or indirectly detect the displacement of the gravity roller 3. Figure 5a In the ideal working state shown in the figure and with balanced forces, the position of the gravity roller 3 is basically stationary; however, in actual production applications, there may be sudden changes in tension, such as uneven film thickness, which causes changes in the film thickness below the gravity roller 3. The constant force acting on films of different thicknesses forms different stretching amounts, which is reflected in the up and down floating of the position of the gravity roller 3. The displacement detection mechanism monitors the distance of the up and down floating offset to understand the process conditions, and can further realize manual adjustment or automatic adjustment of the gravity roller counterweight mechanism 38 based on this.

[0044] For example, taking the wire encoder 39 as an example, the main part of the wire encoder 39 is fixedly mounted on the frame, and the end of the wire of the wire encoder 39 is connected to the gravity roller counterweight mechanism 38, thereby measuring the distance that the gravity roller counterweight mechanism 38 moves up and down; if the film is thick or the tension is too large, the downward force provided by the gravity roller counterweight mechanism 38 is increased to control the distance it moves upward; conversely, if the tension is too small, the downward force provided by the gravity roller counterweight mechanism 38 is reduced. The ideal state is that the roller is in the middle position and the wire encoder 39 measures the distance, with the goal of adjusting the tension and conveying speed behind the traction roller assembly. It is understandable that in other embodiments, the displacement detection device can also be selected as a speed measuring device that measures the film speed, etc., which can indirectly reflect the displacement situation.

[0045] exist Figure 1 In the illustrated embodiment, the pulling roller assembly includes a first active pulling roller 21 and a second active pulling roller 22, each positioned adjacent to the first active pulling roller 21 and the second active pulling roller 22. A gap exists between the first active pulling roller 21 and the second active pulling roller 22, and the film transport path at the first active pulling roller 21 and the second active pulling roller 22 is an S-shaped structure, thus intuitively referred to as an S-roller. The film's S-shaped path around the two pulling rollers increases the wrap angle. Furthermore, since both pulling rollers are active rollers, this achieves a tension-breaking effect, meaning that the tension conditions on the upstream and downstream sides of the pulling roller assembly are independent. More specifically, the second active pulling roller 22 is located below or diagonally below the downstream side of the first active pulling roller 21, and the first guide roller 11 is located above or diagonally above the downstream side of the second active pulling roller 22. This results in the S-shaped film having a larger wrap angle at the pulling rollers, further facilitating the tension-breaking effect.

[0046] In such Figure 7 、 Figure 8In the illustrated embodiment, the pulling roller assembly includes adjacently positioned third active pulling rollers 23 and tension-isolating pressure rollers 24. The tension-isolating pressure rollers 24 are driven rollers and are located on either side of the film conveying path. The film conveying path is tangent to both the third active pulling rollers 23 and the tension-isolating pressure rollers 24. The tension-isolating pressure rollers 24 exert a certain pressure on the film at the tangent points, thereby isolating the tension between the front and rear sides. More specifically, the tension-isolating pressure rollers 24 are positioned against the third active pulling rollers 23 at the entry and / or exit points (the tangent points are the locations where the film and rollers are tangent, with the entry and exit points referring to the film's input and output sides, respectively). The tension-breaking pressure roller 24 is connected to a clamping control mechanism, such as a pneumatic cylinder. The tension-breaking pressure roller 24 is adjustably mounted on the frame via the clamping control mechanism. The clamping control mechanism controls the movement of the tension-breaking pressure roller 24, adjusting the distance between the tension-breaking pressure roller 24 and the third active traction roller 23 (the third active traction roller 23's axial position is fixed), as well as the pressure. Preferably, the third active traction roller 23 is positioned lower than the first guide roller 11, with the tension-breaking pressure roller 24 and the first guide roller 11 located on either side of the third active traction roller 23.

[0047] It should be noted that, for example Figure 6 The multi-roller assembly after the cast film is peeled off preferably adopts the method of a first active pulling roller 21 and a second active pulling roller 22 (S roller) because the film here is a wet film containing a large amount of solvent. If a pressure roller method is used, embossing will be produced, affecting the thickness of the film. Therefore, this special pulling roller structure is designed to avoid the problem of pressure deformation.

[0048] In summary, the tension control component of the present invention, which is applicable to the film conveying process, can achieve better tension control and adjustment effects, and is particularly applicable to the cast film stripping chamber, and can flexibly provide the tension required for the specific process to prevent excessive tension from stretching or damaging the film. It is preferred to use the S-roller method to isolate the tension, and then use the gravity roller assembly to apply constant tension to the film by gravity, so that the film can be slightly stretched longitudinally, and the tension can be adjusted based on the displacement detection device. In addition, the present solution separates the gravity roller counterweight mechanism from the gravity roller and controls them synchronously through the gravity roller synchronous shaft. Such an arrangement allows the gravity roller counterweight mechanism to be located outside the film conveying area, forming sufficient operating space for the staff to adjust the gravity roller counterweight mechanism; therefore, it is more helpful to improve the process quality of current high-end films such as polyimide films.

Claims

1. A tension control component suitable for film conveying, characterized in that: It includes a traction roller assembly and a gravity roller assembly which are sequentially arranged along the film conveying direction; The gravity roller assembly includes a first guide roller, a gravity roller and a second guide roller arranged in sequence along the film conveying direction, and the height position of the gravity roller is lower than the first guide roller and the second guide roller; the gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain or are respectively arranged on two closed chains through a synchronous transmission mechanism; a displacement detection device is provided on the gravity roller or the gravity roller counterweight mechanism or the synchronous transmission mechanism, and the displacement detection device is used to notify the system to adjust the rotation speed of the traction roller assembly after detecting the displacement change.

2. The tension control assembly suitable for film conveying according to claim 1, characterized in that: The gravity roller and the gravity roller counterweight mechanism are arranged on the same closed chain; the closed chain is in a vertically arranged ring, and the closed chain transmission is connected to the sprockets located at its upper and lower ends; the floating block and the gravity roller counterweight mechanism are connected to the closed chain, and the gravity roller is rotatably connected to the floating block.

3. The tension control assembly suitable for film conveying according to claim 1, characterized in that: The closed chain includes a roller chain and a counterweight chain, and the gravity roller and the gravity roller counterweight mechanism are respectively arranged on the roller chain and the counterweight chain; the roller chain is in a vertically arranged ring shape, and the roller chain transmission is connected to the roller sprockets located at its upper and lower ends; the roller chain is connected to a floating block, and the gravity roller is rotationally connected to the floating block; the synchronous transmission mechanism includes a gravity roller synchronous shaft, and the upper and / or lower roller sprockets are coaxially connected to the counterweight sprocket through the gravity roller synchronous shaft, and the counterweight sprocket is transmission-connected to the counterweight chain; the counterweight chain is in a vertically arranged ring shape, and the counterweight chain is connected to the gravity roller counterweight mechanism.

4. The tension control assembly suitable for film conveying according to claim 3, characterized in that: The counterweight chain is located outside the roller chain.

5. The tension control assembly suitable for use in a film conveying process according to any one of claims 2 to 4, characterized in that: The utility model also comprises a vertically arranged gravity roller slide rail, and the floating block is matched with the gravity roller slide rail and is slidably connected.

6. The tension control assembly suitable for use in a film conveying process according to any one of claims 2 to 4, characterized in that: The two ends of the gravity roller in the length direction are connected to the two floating blocks respectively; in the length direction of the gravity roller, relative to the midpoint of the gravity roller length, the gravity roller assembly has a mirror-symmetrical structure.

7. The tension control assembly suitable for use in a film conveying process according to any one of claims 1 to 4, characterized in that: The traction roller assembly includes a first active traction roller and a second active traction roller arranged adjacent to each other, with a gap between the first active traction roller and the second active traction roller. The film conveying path is an S-shaped structure at the first active traction roller and the second active traction roller.

8. The tension control assembly suitable for film conveying according to claim 7, characterized in that: The second active traction roller is located below or obliquely below the downstream side of the first active traction roller, and the first guide roller is located above or obliquely above the downstream side of the second active traction roller.

9. The tension control assembly suitable for use in a film conveying process according to any one of claims 1 to 4, characterized in that: The traction roller assembly includes a third active traction roller and a tension-isolating pressure roller arranged adjacent to each other. The tension-isolating pressure roller is a driven roller. The third active traction roller and the tension-isolating pressure roller are respectively located on both sides of the film conveying path, and the film conveying path is tangent to the third active traction roller and the tension-isolating pressure roller.

10. The tension control assembly suitable for film conveying according to claim 9, characterized in that: The tension isolation roller is connected with a clamping control mechanism.

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