Film tension adjusting device

Abstract

The utility model discloses a film tension adjusting device, and relates to the technical field of coating machine equipment. A first traction roller and a second traction roller; a first dust collection mechanism; a second dust collection mechanism; the left end and the right end of the adjusting roller can be rotationally connected to the support, and the support can be connected to the rack in a sliding mode in the front-back direction; the motor is arranged on the rack, the lead screw is parallel to the front-back direction, one end of the lead screw is rotatably connected to the rack, the other end of the lead screw is connected with the output end of the motor, the nut is arranged on the support, and the nut is in threaded connection with the lead screw; the pushing assembly is used for pushing the support so that the teeth of the nut can abut against the inner wall of the screw groove of the lead screw all the time. After the nut is subjected to a continuous pushing force, the teeth of the nut always abut against the inner wall of the screw groove of the lead screw, so that the tension force of the film cannot be changed due to the gap between the nut and the lead screw, and the film tension adjusting accuracy can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coating machine equipment, and particularly relates to a film tension adjusting device. Background Art

[0002] A coating machine is a device mainly used for the production of film surface coating processes. It coats a roll of film with a coating such as a specific functional glue and ink. After the coating solidifies and dries, the finished coated product is wound up. The film tension adjusting device is a device in the coating equipment used for pulling the film and removing dust. During the process of the film unwinding and moving, impurities such as dust will adhere to the surface of the film. The film tension adjusting device can suck the dust on the film wound around it, avoiding the influence of dust on the coating of the film, which is beneficial to reducing the defective rate of the film finished product. Dust suction will cause the film to be subjected to a certain suction force, and the tension of the film will be affected by the suction force. A tension adjusting mechanism is usually also provided in the film tension adjusting device to eliminate the influence of dust suction on the film tension.

[0003] The tension adjusting mechanism is often a lead screw and nut. The rotation of the lead screw drives the nut to move, so that the nut can drive the adjusting roller to move to adjust the tension of the film wound around the adjusting roller. In the prior art, there is a gap between the teeth on the nut and the thread groove of the lead screw. After the tension adjustment is completed, the lead screw will stop moving. Due to the gap between the teeth on the nut and the thread groove of the lead screw, and because the film wound around the adjusting roller will exert a certain pressure on the adjusting roller, under the action of the film, the film will drive the adjusting roller and the nut to move slightly, resulting in a change in the tension of the film, making the tension adjusting mechanism unable to accurately adjust the tension of the film, thereby reducing the accuracy of film tension adjustment. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a film tension adjusting device, which can improve the accuracy of film tension adjustment.

[0005] The film tension adjusting device according to an embodiment of the utility model includes:

[0006] A frame;

[0007] A first traction roller and a second traction roller, both the left and right ends of the first traction roller and the second traction roller are rotatably connected to the frame. The first traction roller is arranged above the second traction roller, and both the first traction roller and the second traction roller are used for winding the film;

[0008] A first dust suction mechanism, which is arranged on the frame and is used for sucking the dust on the film wound around the first traction roller;

[0009] The second dust suction mechanism is arranged on the frame and is used for sucking dust on the film wound around the second traction roller;

[0010] An adjusting roller, a third traction roller and a support. Both the left and right ends of the adjusting roller are rotatably connected to the support. The adjusting roller is used for winding the film. The support is slidably connected to the frame in the front-back direction. A third traction roller is also included. Both the left and right ends of the third traction roller are rotatably connected to the frame. The third traction roller is arranged below the first traction roller and the adjusting roller and is used for winding the film;

[0011] A nut, a lead screw and a motor. The motor is arranged on the frame. The lead screw is parallel to the front-back direction. One end of the lead screw is rotatably connected to the frame, and the other end of the lead screw is connected to the output end of the motor. The nut is arranged on the support, and the nut is in threaded connection with the lead screw. The motor is used for driving the lead screw to rotate so that the support and the adjusting roller can move forward or backward;

[0012] A pushing component is arranged on the frame and is used for pushing the support in the front-back direction so that the teeth of the nut can always abut against the inner wall of the thread groove of the lead screw.

[0013] It has at least the following beneficial effects:

[0014] The film is wound around the second traction roller, the first traction roller, the third traction roller and the adjusting roller. The first dust suction mechanism can suck the dust on the film wound around the first traction roller, and the second dust suction mechanism can suck the dust on the film wound around the second traction roller, avoiding the influence of dust on the subsequent coating of the film and improving the yield rate of the film products. When the tension of the film needs to be adjusted, the motor drives the lead screw to rotate. Since the lead screw is in threaded connection with the nut, the nut can drive the support to move forward or backward, and then the support can drive the adjusting roller to move forward and backward. Since the film is wound around the adjusting roller, by controlling the forward or backward movement of the adjusting roller, the purpose of adjusting the tension of the film can be achieved. The pushing component can continuously push the support. Since the nut is arranged on the support, under the pushing force of the pushing component, the nut will also receive a continuous pushing force. After the nut receives a continuous pushing force, the teeth of the nut will always abut against the inner wall of the thread groove of the lead screw, avoiding the movement of the nut due to the gap after the lead screw stops rotating, and further avoiding the movement of the support and the adjusting roller, so that the tension of the film wound around the adjusting roller will not change due to the gap between the nut and the lead screw, which is beneficial to improving the accuracy of film tension adjustment.

[0015] For the film tension adjusting device according to an embodiment of the present utility model, the pushing assembly includes a guiding block, a push rod and a spring. The guiding block is arranged on the frame. A first guiding hole is formed in the guiding block. The push rod is parallel to the front-rear direction. One end of the push rod penetrates into the first guiding hole. The other end of the push rod abuts against the support. The spring is sleeved on the push rod. Two ends of the spring are respectively connected with the guiding block and the push rod. The spring is used for driving the push rod to approach the support so that the other end of the push rod can push the support.

[0016] For the film tension adjusting device according to an embodiment of the present utility model, the pushing assembly further includes a flexible block. The other end of the push rod pushes the support through the flexible block.

[0017] For the film tension adjusting device according to an embodiment of the present utility model, a second guiding hole is formed in the support. The other end of the push rod penetrates into the second guiding hole. The other end of the push rod abuts against the bottom wall of the second guiding hole.

[0018] For the film tension adjusting device according to an embodiment of the present utility model, it further includes a slide rail and a slider. The slide rail is parallel to the front-rear direction. The slide rail is arranged on the frame. The slider is arranged on the support. The slider is slidably connected to the slide rail.

[0019] For the film tension adjusting device according to an embodiment of the present utility model, the first dust suction mechanism is slidably connected to the frame so that the first dust suction mechanism can approach or move away from the first traction roller. The second dust suction mechanism is slidably connected to the frame so that the second dust suction mechanism can approach or move away from the second traction roller.

[0020] For the film tension adjusting device according to an embodiment of the present utility model, it further includes a first linear driving member and a second linear driving member. Both the first linear driving member and the second linear driving member are arranged on the frame. The first linear driving member is used for driving the first dust suction mechanism to approach or move away from the first traction roller. The second linear driving member is used for driving the second dust suction mechanism to approach or move away from the second traction roller.

[0021] For the film tension adjusting device according to an embodiment of the present utility model, it further includes a vacuum pump. The first dust suction mechanism includes a first vacuum tube, a first housing and a first connecting seat. A plurality of first through holes are formed in a side surface of the first housing close to the first traction roller. The first housing is connected to the vacuum pump through the first vacuum tube. An output end of the first linear driving member is connected to the first housing through the first connecting seat to drive the first connecting seat and the first housing to approach or move away from the first traction roller.

[0022] According to the film tension adjusting device of the embodiment of the present invention, the second dust suction mechanism includes a second vacuum tube, a second housing, and a second connecting seat. A plurality of second through holes are formed in the side surface of the second housing close to the second traction roller. The second housing is connected to the vacuum pump through the second vacuum tube. The output end of the second linear driving member is connected to the second housing through the second connecting seat to drive the second connecting seat and the second housing to approach or move away from the second traction roller.

[0023] According to the film tension adjusting device of the embodiment of the present invention, it further includes a third traction roller. Both the left and right ends of the third traction roller are rotatably connected to the frame. The third traction roller is arranged below between the first traction roller and the adjusting roller, and the third traction roller is used for the film to be wound around.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following further describes the present invention in conjunction with the drawings and embodiments, where:

[0026] Figure 1 is a schematic structural diagram of the film wound around the film tension adjusting device according to the embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of the film tension adjusting device according to the embodiment of the present invention;

[0028] Figure 3 is Figure 2 a partial enlarged structural diagram at A in

[0029] Figure 4 is a schematic structural diagram of the film tension adjusting device according to the embodiment of the present invention from another perspective;

[0030] Figure 5 is a schematic diagram of the film wound around the second traction roller, the first traction roller, the adjusting roller, and the third traction roller;

[0031] Reference numerals:

[0032] Frame 100; First traction roller 110; Second traction roller 120; Third traction roller 130; Adjusting roller 140; Support 150; Slide rail 151; Slide block 152; Nut 160; Lead screw 170; Motor 180;

[0033] First dust suction mechanism 200; First vacuum tube 210; First housing 220; First connecting seat 230; First linear driving member 240;

[0034] Second dust suction mechanism 300; second vacuum tube 310; second housing 320; second connecting seat 330; second linear driving member 340;

[0035] Thrust assembly 400; guide block 410; ejector rod 420; spring 430; flexible block 440. Detailed implementation mode

[0036] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0038] In the description of the present invention, "a plurality of" refers to more than two. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence of the indicated technical features.

[0039] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0040] Refer to Figures 1 to 3 , the film tension adjusting device of the embodiment of the present invention includes:

[0041] Frame 100;

[0042] The first traction roller 110 and the second traction roller 120, both the left and right ends of the first traction roller 110 and the second traction roller 120 are rotatably connected to the frame 100, and both the first traction roller 110 and the second traction roller 120 are used for winding the film;

[0043] The first dust suction mechanism 200, the first dust suction mechanism 200 is arranged on the frame 100, and the first dust suction mechanism 200 is used to suck the dust on the film wound around the first traction roller 110;

[0044] The second dust suction mechanism 300 is provided on the frame 100 and is used to suck the dust on the film wound around the second traction roller 120.

[0045] The adjusting roller 140, the third traction roller 130 and the support 150. Both the left and right ends of the adjusting roller 140 are rotatably connected to the support 150. The adjusting roller 140 is used for the film to be wound around. The support 150 is slidably connected to the frame 100 in the front-back direction. It further includes the third traction roller 130. Both the left and right ends of the third traction roller 130 are rotatably connected to the frame 100. The third traction roller 130 is arranged below between the first traction roller 110 and the adjusting roller 140 and is used for the film to be wound around.

[0046] The nut 160, the lead screw 170 and the motor 180. The motor 180 is provided on the frame 100. The lead screw 170 is parallel to the front-back direction. One end of the lead screw 170 is rotatably connected to the frame 100, and the other end of the lead screw 170 is connected to the output end of the motor 180. The nut 160 is provided on the support 150 and is threadedly connected to the lead screw 170. The motor 180 is used to drive the lead screw 170 to rotate so that the support 150 and the adjusting roller 140 can move forward or backward.

[0047] The pushing component 400 is provided on the frame 100 and is used to push the support 150 in the front-back direction so that the teeth of the nut 160 can always abut against the inner wall of the thread groove of the lead screw 170.

[0048] It can be understood that the film is wound around the second traction roller 120, the first traction roller 110, the adjusting roller 140 and the third traction roller 130. The first dust suction mechanism 200 can suck the dust on the film wound around the first traction roller 110, and the second dust suction mechanism 300 can suck the dust on the film wound around the second traction roller 120, avoiding the influence of dust on the subsequent coating of the film and improving the yield rate of the film product. When it is necessary to adjust the tension of the film, the motor 180 drives the lead screw 170 to rotate. Since the lead screw 170 is threadedly connected to the nut 160, the nut 160 can drive the support 150 to move forward or backward, and then the support 150 can drive the adjusting roller 140 to move forward and backward. Since the film is wound around the adjusting roller 140, by controlling the forward or backward movement of the adjusting roller 140, the purpose of adjusting the tension of the film can be achieved. The pushing component 400 can continuously push the support 150. Since the nut 160 is arranged on the support 150, under the pushing force of the pushing component 400, the nut 160 will also receive a continuous pushing force. After the nut 160 receives a continuous pushing force, the teeth of the nut 160 will always be in contact with the inner wall of the thread groove of the lead screw 170, avoiding the movement of the nut 160 due to the gap after the lead screw 170 stops rotating, and then avoiding the movement of the support 150 and the adjusting roller 140, so that the tension of the film wound around the adjusting roller 140 will not change due to the gap between the nut 160 and the lead screw 170, which is beneficial to improving the accuracy of film tension adjustment.

[0049] Reference Figure 2 and Figure 3 , the pushing component 400 includes a guiding block 410, a push rod 420 and a spring 430. The guiding block 410 is arranged on the frame 100. A first guiding hole is formed in the guiding block 410. The push rod 420 is parallel to the front-rear direction. One end of the push rod 420 passes through the first guiding hole, and the other end of the push rod 420 abuts against the support 150. The spring 430 is sleeved on the push rod 420. The two ends of the spring 430 are respectively connected to the guiding block 410 and the push rod 420. The spring 430 is used to drive the push rod 420 to approach the support 150 so that the other end of the push rod 420 can push the support 150. It can be understood that under the elastic force of the spring 430, the push rod 420 always has a tendency to move towards the support 150, and the other end of the push rod 420 abuts against the support 150, so that the push rod 420 can always generate a pushing force on the support 150, and then the teeth of the nut 160 can always be in contact with the inner wall of the thread groove of the lead screw 170. Specifically, in the present utility model, the spring 430 is parallel to the front-rear direction. No matter whether the support 150 moves forward or backward, the spring 430 is always in a compressed state, that is, the spring 430 can continuously apply a force to the push rod 420 to move towards the support 150.

[0050] Reference Figure 3, the pushing component 400 further includes a flexible block 440, and the other end of the ejector rod 420 pushes against the support 150 through the flexible block 440. It can be understood that the flexible block 440 is connected to the other end of the ejector rod 420, and the flexible block 440 abuts against the support 150, that is, the other end of the ejector rod 420 pushes against the support 150 through the flexible block 440. The flexible block 440 can prevent the other end of the ejector rod 420 from directly acting on the support 150, and avoid damage to the ejector rod 420 and the support 150 due to long-term pressing contact.

[0051] As an embodiment of the present invention, a second guiding hole is formed in the support 150, and the other end of the ejector rod 420 is inserted into the second guiding hole, and the other end of the ejector rod 420 abuts against the bottom wall of the second guiding hole. It can be understood that the other end of the ejector rod 420 is inserted into the second guiding hole, and the hole wall of the second guiding hole can guide and position the ejector rod 420, avoiding the swing of the ejector rod 420 during the forward or backward movement, and improving the stability of the pushing of the ejector rod 420. On the other hand, the other end of the ejector rod 420 abuts against the bottom wall of the second guiding hole, and the other end of the ejector rod 420 pushes against the bottom wall of the second guiding hole, so that the other end of the ejector rod 420 can push against the support 150.

[0052] Reference Figure 2 , the film tension adjusting device further includes a slide rail 151 and a slider 152. The slide rail 151 is parallel to the front-back direction, the slide rail 151 is arranged on the frame 100, the slider 152 is arranged on the support 150, and the slider 152 is slidably connected to the slide rail 151.

[0053] Reference Figure 4 , the first dust suction mechanism 200 is slidably connected to the frame 100 so that the first dust suction mechanism 200 can approach or move away from the first traction roller 110, and the second dust suction mechanism 300 is slidably connected to the frame 100 so that the second dust suction mechanism 300 can approach or move away from the second traction roller 120. It can be understood that the first dust suction mechanism 200 is slidably connected to the frame 100, the first dust suction mechanism 200 can approach or move away from the first traction roller 110, the second dust suction mechanism 300 is slidably connected to the frame 100, and the second dust suction mechanism 300 can approach or move away from the second traction roller 120. The operator can change the distances between the first dust suction mechanism 200 and the second dust suction mechanism 300 and the first traction roller 110 and the second traction roller 120 respectively according to the actual dust suction effect, so as to change different dust suction effects and improve the flexibility of use of the first dust suction mechanism 200 and the second dust suction mechanism 300.

[0054] Reference Figure 4, the film tension adjusting device further includes a first linear driving member 240 and a second linear driving member 340. The first linear driving member 240 and the second linear driving member 340 are both arranged on the frame 100. The first linear driving member 240 is used to drive the first dust suction mechanism 200 to approach or move away from the first traction roller 110, and the second linear driving member 340 is used to drive the second dust suction mechanism 300 to approach or move away from the second traction roller 120. It can be understood that the first linear driving member 240 can drive the first dust suction member to approach or move away from the first traction roller 110, and the second linear driving member 340 can drive the second dust suction member to approach or move away from the second traction roller 120, thereby changing the dust suction effect of the second dust suction member. For example, when the first dust suction member is closer to the first traction roller 110, the dust suction effect of the first dust suction member is better, and when the second dust suction member is closer to the second traction roller 120, the dust suction effect of the second dust suction member is better. As an embodiment of the utility model, the first linear driving member 240 and the second linear driving member 340 can be a first air cylinder and a second air cylinder respectively.

[0055] Reference Figure 4 , the film tension adjusting device further includes a vacuum pump. The first dust suction mechanism 200 includes a first vacuum tube 210, a first housing 220, and a first connecting seat 230. A plurality of first through holes are formed on the side surface of the first housing 220 close to the first traction roller 110. The first housing 220 is connected to the vacuum pump through the first vacuum tube 210. The output end of the first linear driving member 240 is connected to the first housing 220 through the first connecting seat 230 to drive the first connecting seat 230 and the first housing 220 to approach or move away from the first traction roller 110. The second dust suction mechanism 300 includes a second vacuum tube 310, a second housing 320, and a second connecting seat 330. A plurality of second through holes are formed on the side surface of the second housing 320 close to the second traction roller 120. The second housing 320 is connected to the vacuum pump through the second vacuum tube 310. The output end of the second linear driving member 340 is connected to the second housing 320 through the second connecting seat 330 to drive the second connecting seat 330 and the second housing 320 to approach or move away from the second traction roller 120.

[0056] It can be understood that one end of the first vacuum tube 210 is communicated with the cavity of the first housing 220, and the other end of the first vacuum tube 210 is connected to the vacuum pump. When the vacuum pump works, a vacuum is generated in the cavity of the first housing 220, and then the dust on the film enters the first housing 220 through the first through holes under the action of suction, achieving the purpose of sucking the dust on the film wound around the first traction roller 110. Similarly, one end of the second vacuum tube 310 is communicated with the cavity of the second housing 320, and the other end of the second vacuum tube 310 is connected to the vacuum pump. When the vacuum pump works, a vacuum is generated in the cavity of the second housing 320, and then the dust on the film enters the second housing 320 through the second through holes under the action of suction, achieving the purpose of sucking the dust on the second film.

[0057] Reference Figure 2 and Figure 5 In the present utility model, the first traction roller 110 is disposed above the second traction roller 120, the adjusting roller 140 is disposed in front of the first traction roller 110, and the third traction roller 130 is disposed below between the first traction roller 110 and the adjusting roller 140. The film is sequentially wound around the second traction roller 120, the first traction roller 110, the adjusting roller 140, and the third traction roller 130.

[0058] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0059] Certainly, the present utility model is not limited to the above-described embodiments. Those skilled in the art can also make equivalent deformations or substitutions without departing from the spirit of the present utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A film tension adjustment device, characterized in that: include: frame; A first traction roller and a second traction roller, both left and right ends of the first traction roller and the second traction roller are rotatably connected to the frame, the first traction roller is arranged above the second traction roller, and the first traction roller and the second traction roller are both used for winding the film; A first dust suction mechanism, the first dust suction mechanism is arranged on the frame, and the first dust suction mechanism is used to suck dust on the film wound around the first traction roller; A second dust suction mechanism, the second dust suction mechanism is arranged on the frame, and the second dust suction mechanism is used to suck dust on the film wound around the second traction roller; An adjusting roller, a third traction roller and a support, wherein both left and right ends of the adjusting roller are rotatably connected to the support, the adjusting roller is used for winding the film, the support is slidably connected to the frame in the front-rear direction, and further comprises a third traction roller, both left and right ends of the third traction roller are rotatably connected to the frame, the third traction roller is arranged below between the first traction roller and the adjusting roller, and the third traction roller is used for winding the film; A nut, a screw rod and a motor, wherein the motor is arranged on the frame, the screw rod is parallel to the front-rear direction, one end of the screw rod is rotatably connected to the frame, and the other end of the screw rod is connected to the output end of the motor, the nut is arranged on the support, the nut is threadedly connected to the screw rod, and the motor is used to drive the screw rod to rotate so that the support and the adjusting roller can move forward or backward; A pushing assembly is arranged on the frame and is used to push the support in a front-rear direction so that the teeth of the nut can always abut against the inner wall of the screw groove of the screw rod.

2. The film tension adjustment device according to claim 1, characterized in that: The pushing assembly includes a guide block, a push rod and a spring. The guide block is arranged on the frame. A first guide hole is opened on the guide block. The push rod is parallel to the front and rear directions. One end of the push rod is inserted into the first guide hole. The other end of the push rod abuts against the support. The spring is sleeved on the push rod. The two ends of the spring are respectively connected to the guide block and the push rod. The spring is used to drive the push rod to approach the support so that the other end of the push rod can push the support.

3. The film tension adjustment device according to claim 2, characterized in that: The pushing assembly further comprises a flexible block, and the other end of the push rod pushes the support through the flexible block.

4. The film tension adjustment device according to claim 2, characterized in that: A second guide hole is formed on the support, and the other end of the push rod is inserted into the second guide hole, and the other end of the push rod abuts against the bottom wall of the second guide hole.

5. The film tension adjustment device according to claim 1, characterized in that: It also includes a slide rail and a slider, wherein the slide rail is parallel to the front-rear direction, the slide rail is arranged on the frame, the slider is arranged on the support, and the slider is slidably connected to the slide rail.

6. The film tension adjustment device according to claim 1, characterized in that: The first dust suction mechanism is slidably connected to the frame so that the first dust suction mechanism can be close to or away from the first traction roller, and the second dust suction mechanism is slidably connected to the frame so that the second dust suction mechanism can be close to or away from the second traction roller.

7. The film tension adjustment device according to claim 6, characterized in that: It also includes a first linear drive member and a second linear drive member, both of which are arranged on the frame, the first linear drive member is used to drive the first dust suction mechanism to approach or move away from the first traction roller, and the second linear drive member is used to drive the second dust suction mechanism to approach or move away from the second traction roller.

8. The film tension adjustment device according to claim 7, characterized in that: It also includes a vacuum pump, and the first dust suction mechanism includes a first vacuum tube, a first shell and a first connecting seat. A plurality of first through holes are opened on the side of the first shell close to the first traction roller. The first shell is connected to the vacuum pump through the first vacuum tube, and the output end of the first linear drive member is connected to the first shell through the first connecting seat to drive the first connecting seat and the first shell to approach or move away from the first traction roller.

9. The film tension adjustment device according to claim 8, characterized in that: The second dust suction mechanism includes a second vacuum tube, a second shell and a second connecting seat. A plurality of second through holes are provided on the side of the second shell close to the second traction roller. The second shell is connected to the vacuum pump through the second vacuum tube. The output end of the second linear drive member is connected to the second shell through the second connecting seat to drive the second connecting seat and the second shell to approach or move away from the second traction roller.

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