Unreeling equipment capable of automatically controlling tension

Abstract

The utility model discloses unwinding equipment capable of automatically controlling tension, which belongs to the technical field of unwinding of coiled materials and comprises a bottom plate, an unwinding device and a driving device are mounted at the upper end of the bottom plate, and the unwinding device is positioned on the left of the driving device. The unwinding device comprises a conveying assembly, a tension adjusting assembly, a deviation rectifying assembly and a monitoring assembly, the conveying assembly and the deviation rectifying assembly are connected with the upper end of the bottom plate, the lower end of the tension adjusting assembly is connected with the deviation rectifying assembly, and the right side of the monitoring assembly is connected with the conveying assembly. By means of the mode, automatic adjustment of tension is achieved through a simple mechanical structure of the tension adjusting assembly, and the equipment cost and the maintenance cost are low; through the arrangement of the shallow groove in the adjusting roller, the adjusting roller can rectify the deviation of the coiled material, and the coiled material is always kept at a specified position through the front-back movement of the adjusting roller by the monitoring assembly and the deviation rectifying assembly; and the coiled material is driven by the driving assembly and the pressing assembly before being processed, so that deformation of the processed coiled material caused by driving tension is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of coil unwinding, in particular to an unwinding device capable of automatically controlling tension. Background Art

[0002] Insulating film is a film material used to wrap or cover electrical components to provide insulation protection. When using the insulating film, the rolled film usually needs to be unrolled for punching or cutting.

[0003] For example, Chinese patent application CN218434099U discloses a constant tension printing system rewinding and unwinding device, including an unwinding tension control unit arranged at the feeding end of the printing system and a rewinding tension control unit arranged at the discharging end of the printing system, wherein the unwinding tension control unit includes an unwinding component, an unwinding tension detection component, an unwinding tension controller, an unwinding tension control actuator and a first Hall switch; the rewinding tension control unit includes a receiving component, a rewinding tension detection component, a rewinding tension controller, a rewinding tension control actuator and a second Hall switch.

[0004] However, the reeling and unreeling device of the constant tension printing system uses a large number of controllers and control units, which results in high equipment and maintenance costs, and also cannot avoid the deviation of the roll material.

[0005] Based on this, the utility model designs an unwinding device with automatic tension control to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides an unwinding device with automatic tension control.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] An unwinding device with automatic tension control comprises a bottom plate,

[0009] An unwinding device and a driving device are installed on the upper end of the bottom plate, and the unwinding device is located on the left side of the driving device;

[0010] The unwinding device includes a conveying component, a tension adjustment component, a deviation correction component and a monitoring component. The conveying component and the deviation correction component are connected to the upper end of the bottom plate, the lower end of the tension adjustment component is connected to the deviation correction component, and the right side of the monitoring component is connected to the conveying component.

[0011] Furthermore, the conveying assembly includes a conveying bracket and a conveying roller. Two conveying rollers are provided. The conveying bracket is fixedly mounted on the upper end of the base plate. The two conveying rollers are horizontally distributed on the inner side of the conveying bracket. The front and rear ends of the conveying rollers are respectively rotatably connected to the inner side of the conveying bracket. The left side of the conveying bracket is connected to the monitoring assembly.

[0012] Furthermore, the tension adjustment assembly includes a base, a sliding frame, an adjusting roller, a sliding seat, a spring and a directional rod. Two sliding frames, two sliding seats, two springs and two directional rods are provided. The lower end of the base is connected to the correction assembly. The two sliding frames are located at the front and rear sides of the upper end of the base. A groove is provided on the inner side of the sliding frame. A through hole is provided on the upper end of the sliding frame. Blocks are provided on the left and right sides of the sliding seat. The two sliding seats are respectively slidably connected to the inner sides of the two sliding frames. The upper end of the sliding seat is fixedly connected to the spring and the directional rod. The spring is sleeved on the outer side of the directional rod. The upper end of the spring is fixedly connected to the sliding frame. The upper end of the directional rod passes through the sliding frame and is slidably connected to the sliding frame. The front and rear ends of the adjusting roller are respectively rotatably connected to the two sliding seats.

[0013] Furthermore, the correction component includes a correction bracket, a correction electric cylinder, a connecting block, a slide groove and a slider. There are four slide grooves and four sliders. The lower end of the correction bracket is fixedly connected to the base plate. The upper end of the correction bracket is provided with four slide grooves. The four slide grooves are respectively slidably connected to four sliders. The upper end of the slider is fixedly connected to the base. The correction electric cylinder is fixedly connected to the base plate and the correction bracket. The output end of the correction electric cylinder is fixedly connected to the connecting block. The upper end of the connecting block is fixedly connected to the base.

[0014] Furthermore, a thread-like shallow groove is arranged on the outer side of the adjusting roller, the front thread-like shallow groove is arranged to rotate clockwise toward the middle, and the rear thread-like shallow groove is arranged to rotate counterclockwise toward the middle.

[0015] Furthermore, the monitoring component includes a linear module and a correcting sensor head. The right side of the fixed plate of the linear module is fixedly connected to the conveying bracket, the upper end of the sliding block of the linear module is fixedly connected to the correcting sensor head, the clamping part of the correcting sensor head is horizontally arranged at the upper ends of the two conveying rollers, and the correcting sensor head is the existing technology.

[0016] Furthermore, the driving device includes a supporting assembly, a driving assembly and a clamping roller, the supporting assembly is connected to the upper end of the base plate, the driving assembly and the clamping assembly are connected to the upper end of the supporting assembly, and the driving assembly is connected to the clamping assembly.

[0017] Furthermore, the supporting assembly includes a driving bracket, a front plate and a rear plate, the lower end of the driving bracket is fixedly connected to the bottom plate, the front plate and the rear plate are respectively located at the front and rear sides of the upper end of the driving bracket, the front plate and the rear plate are fixedly connected to the upper end of the driving bracket, and the front plate and the rear plate are connected to the driving assembly and the clamping assembly.

[0018] Furthermore, the driving assembly includes a motor, a driving roller and a pulley component, the motor is fixedly connected to the rear end of the rear plate, two driving rollers are provided, the pulley component includes two synchronous wheels and a belt, the output end of the motor is fixedly connected to the rear end of a driving roller, the two driving rollers are horizontally arranged between the front plate and the rear plate, the front end of the driving roller is rotatably connected to the front plate, the rear end of the driving roller is rotatably connected to the rear plate, the front end of the driving roller is fixedly connected to the two synchronous wheels of the pulley component, the two synchronous wheels of the pulley component are respectively rotatably connected to the front plate, and the front end of a synchronous wheel of the pulley component is connected to the clamping assembly.

[0019] Furthermore, the clamping assembly includes a clamping roller, gears and a connecting rod. Two gears are provided. The clamping roller is located above and in the middle of the two driving rollers. The front and rear ends of the clamping roller are rotatably connected to the front plate and the rear plate respectively. The front end of the clamping roller is fixedly connected to the connecting rod, the rear end of the connecting rod is rotatably connected to the front plate, the front end of the connecting rod is fixedly connected to a gear, and the other gear is fixedly connected to a synchronous wheel of the pulley component. The two gears are meshed with each other.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model uses a tension adjustment component to realize automatic tension adjustment through a simple mechanical structure, and the equipment cost and maintenance cost are low;

[0022] The utility model arranges a shallow groove on the adjusting roller so that the adjusting roller can correct the coil to a certain extent during the rotation process, and then moves the adjusting roller forward and backward through the monitoring component and the correction component, so that the coil can always maintain a specified position; the driving component and the clamping component are used to drive the coil before processing, thereby avoiding deformation of the processed coil caused by the pulling force of the driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a three-dimensional diagram of an unwinding device with automatic tension control according to the utility model;

[0025] Figure 2 It is a front view of an unwinding device with automatic tension control according to the utility model;

[0026] Figure 3 It is a top view of an unwinding device with automatic tension control according to the utility model;

[0027] Figure 4 It is a three-dimensional diagram of the unwinding device of the utility model;

[0028] Figure 5 It is a left side view of the unwinding device of the utility model;

[0029] Figure 6 It is a three-dimensional diagram of the driving device of the utility model.

[0030] The numbers in the figure represent:

[0031] 1. Bottom plate 2. Unwinding device 21. Conveying assembly 211. Conveying bracket 212. Conveying roller 22. Tension adjustment assembly 221. Base 222. Sliding frame 223. Adjusting roller 224. Sliding seat 225. Spring 226. Orienting rod 23. Correction assembly 231. Correction bracket 232. Correction electric cylinder 233. Connecting block 234. Slide 235. Slider 24. Monitoring assembly 241. Linear module 242. Correction sensor head 3. Driving device 31. Support assembly 311. Driving bracket 312. Front plate 313. Rear plate 32. Driving assembly 321. Motor 322. Driving roller 323. Pulley component 33. Clamping assembly 331. Clamping roller 332. Gear 333. Connecting rod. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0034] Embodiment 1

[0035] In some embodiments, please refer to the attached instructions. Figure 1-6 , an unwinding device with automatic tension control, comprising a bottom plate 1,

[0036] The unwinding device 2 and the driving device 3 are installed on the upper end of the bottom plate 1, and the unwinding device 2 is located on the left side of the driving device 3;

[0037] The unwinding device 2 includes a conveying component 21, a tension adjustment component 22, a correction component 23 and a monitoring component 24. The conveying component 21 and the correction component 23 are connected to the upper end of the base plate 1, the lower end of the tension adjustment component 22 is connected to the correction component 23, and the right side of the monitoring component 24 is connected to the conveying component 21.

[0038] When the unwinding equipment with automatic tension control operates normally, the drive device 3 drives the coil to move to the right. During the movement of the coil, the tension adjustment component 22 will move up and down in real time when subjected to different pulling forces, so that the tension received by the coil remains basically consistent. The deviation correction component 23 and the monitoring component 24 prevent the deviation of the coil movement from affecting the subsequent processes.

[0039] The conveying assembly 21 includes a conveying bracket 211 and a conveying roller 212. Two conveying rollers 212 are provided. The conveying bracket 211 is fixedly installed on the upper end of the base plate 1. The two conveying rollers 212 are horizontally distributed on the inner side of the conveying bracket 211. The front and rear ends of the conveying rollers 212 are respectively rotatably connected to the inner side of the conveying bracket 211. The left side of the conveying bracket 211 is connected to the monitoring assembly 24.

[0040] The tension adjustment assembly 22 includes a base 221, a sliding frame 222, an adjusting roller 223, a sliding seat 224, a spring 225 and an directional rod 226. The sliding frame 222, the sliding seat 224, the spring 225 and the directional rod 226 are all provided with two. The lower end of the base 221 is connected to the correction assembly 23, the two sliding frames 222 are located at the front and rear sides of the upper end of the base 221, the inner side of the sliding frame 222 is provided with a groove, the upper end of the sliding frame 222 is provided with a through hole, and the left and right sides of the sliding seat 224 are provided with blocks. The two sliding seats 224 are respectively slidably connected to the inner sides of the two sliding frames 222, the upper end of the sliding seat 224 is fixedly connected to the spring 225 and the directional rod 226, the spring 225 is sleeved on the outer side of the directional rod 226, the upper end of the spring 225 is fixedly connected to the sliding frame 222, the upper end of the directional rod 226 passes through the sliding frame 222 and is slidably connected to the sliding frame 222, and the front and rear ends of the adjusting roller 223 are rotatably connected to the two sliding seats 224 respectively.

[0041] The correcting assembly 23 includes a correcting bracket 231, a correcting electric cylinder 232, a connecting block 233, a slide groove 234 and a slider 235. There are four slide grooves 234 and four sliders 235. The lower end of the correcting bracket 231 is fixedly connected to the base plate 1. The upper end of the correcting bracket 231 is provided with four slide grooves 234. The four slide grooves 234 are respectively slidably connected to four sliders 235. The upper end of the slider 235 is fixedly connected to the base 221. The correcting electric cylinder 232 is fixedly connected to the base plate 1 and the correcting bracket 231. The output end of the correcting electric cylinder 232 is fixedly connected to the connecting block 233. The upper end of the connecting block 233 is fixedly connected to the base 221.

[0042] The outer side of the adjusting roller 223 is provided with a thread-like shallow groove, the front end thread-like shallow groove is arranged to rotate clockwise toward the middle, and the rear end thread-like shallow groove is arranged to rotate counterclockwise toward the middle.

[0043] The monitoring component 24 includes a linear module 241 and a correcting sensor head 242. The right side of the fixed plate of the linear module 241 is fixedly connected to the conveying bracket 211, the upper end of the sliding block of the linear module 241 is fixedly connected to the correcting sensor head 242, and the clamping part of the correcting sensor head 242 is horizontally arranged with the upper ends of the two conveying rollers 212. The correcting sensor head 242 is the existing technology.

[0044] When the unwinding device with automatic tension control operates normally, the coil passes through the upper end of the left conveying roller 212, the lower end of the adjusting roller 223, and then the upper end of the right conveying roller 212 into the driving device 3, the linear module 241 is started, and the sliding block on the linear module 241 moves back and forth, and the sliding block of the linear module 241 drives the correcting sensor head 242 to move back and forth, and moves the clamping mouth of the correcting sensor head 242 to one side of the coil, and the driving device 3 is started to move the coil to the right. When the coil moves to the right, it drives the conveying roller 212 and the adjusting roller 223 to rotate, and at the same time, the adjusting roller 223 is forced to move upward, and the adjusting roller 223 drives the sliding seat 224 to move upward, and the sliding seat 224 compresses the spring 225 upward. When the driving device 3 stops running and performs subsequent operations on the coil, the coil stops moving, and the conveying roller 212 and the adjusting roller 2 23 may continue to rotate under the action of inertia. At this time, the coil is in a loose state. The spring 225 applies a downward force to the sliding seat 224 so that the sliding seat 224 drives the adjusting roller 223 to move downward, so that the surface tension of the coil remains basically unchanged; the coil may deviate during the movement. The shallow groove setting on the adjusting roller 223 can correct the deviation of the coil under certain conditions. When the deviation of the coil is too large, the correcting sensor head 242 senses the deviation of one side of the coil, and the correcting electric cylinder 232 is started. The correcting electric cylinder 232 drives the connecting block 233 to move back and forth. The connecting block 233 drives the base 221 to move back and forth through the sliding groove 234 and the slider 235. The base 221 drives the sliding frame 222 and the adjusting roller 223 to move back and forth, so that the coil can always be in the specified position, avoiding the influence of the coil deviation on the subsequent processes.

[0045] The driving device 3 includes a supporting assembly 31 , a driving assembly 32 and a pressing roller 331 . The supporting assembly 31 is connected to the upper end of the base plate 1 . The driving assembly 32 and the pressing assembly 33 are connected to the upper end of the supporting assembly 31 . The driving assembly 32 is connected to the pressing assembly 33 .

[0046] The support assembly 31 includes a driving bracket 311, a front plate 312 and a rear plate 313. The lower end of the driving bracket 311 is fixedly connected to the base plate 1. The front plate 312 and the rear plate 313 are respectively located at the front and rear sides of the upper end of the driving bracket 311. The front plate 312 and the rear plate 313 are fixedly connected to the upper end of the driving bracket 311. The front plate 312 and the rear plate 313 are connected to the driving assembly 32 and the clamping assembly 33.

[0047] The driving assembly 32 includes a motor 321, a driving roller 322 and a pulley component 323. The motor 321 is fixedly connected to the rear end of the rear plate 313. Two driving rollers 322 are provided. The pulley component 323 includes two synchronous wheels and a belt. The output end of the motor 321 is fixedly connected to the rear end of a driving roller 322. The two driving rollers 322 are horizontally arranged between the front plate 312 and the rear plate 313. The front end of the driving roller 322 is rotatably connected to the front plate 312, the rear end of the driving roller 322 is rotatably connected to the rear plate 313, the front end of the driving roller 322 is fixedly connected to the two synchronous wheels of the pulley component 323, the two synchronous wheels of the pulley component 323 are respectively rotatably connected to the front plate 312, and the front end of a synchronous wheel of the pulley component 323 is connected to the clamping assembly 33.

[0048] The clamping assembly 33 includes a clamping roller 331, a gear 332 and a connecting rod 333. Two gears 332 are provided. The clamping roller 331 is located above and in the middle of the two driving rollers 322. The front and rear ends of the clamping roller 331 are rotatably connected to the front plate 312 and the rear plate 313 respectively. The front end of the clamping roller 331 is fixedly connected to the connecting rod 333. The rear end of the connecting rod 333 is rotatably connected to the front plate 312. The front end of the connecting rod 333 is fixedly connected to a gear 332. The other gear 332 is fixedly connected to a synchronous wheel of the pulley component 323. The two gears 332 are meshed with each other.

[0049] When the unwinding device with automatic tension control operates normally, the coil passes through the lower end of the pinch roller 331 through the upper ends of the two driving rollers 322, and the motor 321 is started. The motor 321 drives the left driving roller 322 to rotate, and the left driving roller 322 drives the left synchronous wheel of the pulley component 323 to rotate. The left synchronous wheel of the pulley component 323 drives the right synchronous wheel to rotate through the belt, and the right synchronous wheel of the pulley component 323 drives the right driving roller 322 to rotate. The left synchronous wheel of the pulley component 323 rotates while driving the left gear 332 to rotate. The left gear 332 meshes and drives the right gear 332 to rotate in the opposite direction. The right gear 332 drives the pinch roller 331 to rotate, so that the two driving rollers 322 rotate synchronously clockwise to drive the coil to move right, and the pinch roller 331 rotates in the opposite direction to drive the coil to move right, while flattening and pressing the coil, which is convenient for subsequent processing. Driving before the processing step also avoids deformation of the processed coil caused by the driving force.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An unwinding device with automatic tension control, comprising a bottom plate (1), characterized in that: An unwinding device (2) and a driving device (3) are installed on the upper end of the bottom plate (1), and the unwinding device (2) is located on the left side of the driving device (3); The unwinding device (2) comprises a conveying component (21), a tension adjustment component (22), a deviation correction component (23) and a monitoring component (24); the conveying component (21) and the deviation correction component (23) are connected to the upper end of the bottom plate (1); the lower end of the tension adjustment component (22) is connected to the deviation correction component (23); and the right side of the monitoring component (24) is connected to the conveying component (21).

2. The unwinding device with automatic tension control according to claim 1, characterized in that: The conveying assembly (21) comprises a conveying bracket (211) and a conveying roller (212), two conveying rollers (212) are provided, the conveying bracket (211) is fixedly mounted on the upper end of the bottom plate (1), the two conveying rollers (212) are horizontally distributed inside the conveying bracket (211), the front and rear ends of the conveying rollers (212) are respectively rotatably connected to the inside of the conveying bracket (211), and the left side of the conveying bracket (211) is connected to the monitoring assembly (24).

3. The unwinding device with automatic tension control according to claim 2, characterized in that: The tension adjustment component (22) comprises a base (221), a sliding frame (222), an adjustment roller (223), a sliding seat (224), a spring (225) and a directional rod (226); two sliding frames (222), two sliding seats (224), two springs (225) and two directional rods (226) are provided; the lower end of the base (221) is connected to the deviation correction component (23); the two sliding frames (222) are located at the front and rear sides of the upper end of the base (221); the inner side of the sliding frame (222) is provided with a groove; the upper end of the sliding frame (222) is provided with a through hole; Blocks are arranged on the left and right sides of the seat (224); the two sliding seats (224) are respectively slidably connected to the inner sides of the two sliding frames (222); the upper ends of the sliding seats (224) are fixedly connected to the spring (225) and the directional rod (226); the spring (225) is sleeved on the outer side of the directional rod (226); the upper end of the spring (225) is fixedly connected to the sliding frame (222); the upper end of the directional rod (226) passes through the sliding frame (222) and is slidably connected to the sliding frame (222); the front and rear ends of the adjusting roller (223) are respectively rotatably connected to the two sliding seats (224).

4. The unwinding device with automatic tension control according to claim 3 is characterized in that: The deflection correction component (23) comprises a deflection correction bracket (231), a deflection correction electric cylinder (232), a connecting block (233), a slide groove (234) and a slider (235). Four slide grooves (234) and four sliders (235) are provided. The lower end of the deflection correction bracket (231) is fixedly connected to the bottom plate (1). The upper end of the deflection correction bracket (231) is provided with four slide grooves (234). The four slide grooves (234) are respectively slidably connected to four sliders (235). The upper end of the slider (235) is fixedly connected to the base (221). The deflection correction electric cylinder (232) is fixedly connected to the bottom plate (1) and the deflection correction bracket (231). The output end of the deflection correction electric cylinder (232) is fixedly connected to the connecting block (233). The upper end of the connecting block (233) is fixedly connected to the base (221).

5. The unwinding device with automatic tension control according to claim 4, characterized in that: The outer side of the adjusting roller (223) is provided with a thread-shaped shallow groove, the front thread-shaped shallow groove is arranged to rotate clockwise toward the middle, and the rear thread-shaped shallow groove is arranged to rotate counterclockwise toward the middle.

6. The unwinding device with automatic tension control according to claim 5, characterized in that: The monitoring component (24) comprises a linear module (241) and a deflection correction sensor head (242); the right side of a fixed plate of the linear module (241) is fixedly connected to the conveying bracket (211); the upper end of a sliding block of the linear module (241) is fixedly connected to the deflection correction sensor head (242); and the clamping opening of the deflection correction sensor head (242) is horizontally arranged with the upper ends of two conveying rollers (212).

7. The unwinding device with automatic tension control according to claim 6, characterized in that: The driving device (3) comprises a supporting assembly (31), a driving assembly (32) and a pressing roller (331); the supporting assembly (31) is connected to the upper end of the base plate (1); the driving assembly (32) and the pressing assembly (33) are connected to the upper end of the supporting assembly (31); and the driving assembly (32) is connected to the pressing assembly (33).

8. The unwinding device with automatic tension control according to claim 7, characterized in that: The support assembly (31) comprises a driving bracket (311), a front plate (312) and a rear plate (313), the lower end of the driving bracket (311) is fixedly connected to the bottom plate (1), and the front plate (312) and the rear plate (313) are respectively At the front and rear sides of the upper end of the driving bracket (311), the front plate (312) and the rear plate (313) are fixedly connected to the upper end of the driving bracket (311), and the front plate (312) and the rear plate (313) are connected to the driving assembly (32) and the pressing assembly (33).

9. The unwinding device with automatic tension control according to claim 8, characterized in that: The driving assembly (32) comprises a motor (321), a driving roller (322) and a pulley component (323); the motor (321) is fixedly connected to the rear end of the rear plate (313); two driving rollers (322) are provided; the pulley component (323) comprises two synchronous wheels and a belt; the output end of the motor (321) is fixedly connected to the rear end of a driving roller (322); the two driving rollers (322) are horizontally arranged between the front plate (312) and the rear plate (313); the front end of the driving roller (322) is rotationally connected to the front plate (312); the rear end of the driving roller (322) is rotationally connected to the rear plate (313); the front end of the driving roller (322) is fixedly connected to the two synchronous wheels of the pulley component (323); the two synchronous wheels of the pulley component (323) are rotationally connected to the front plate (312) respectively; and the front end of a synchronous wheel of the pulley component (323) is connected to the clamping assembly (33).

10. The unwinding device with automatic tension control according to claim 9, characterized in that: The clamping assembly (33) comprises a clamping roller (331), a gear (332) and a connecting rod (333). Two gears (332) are provided. The clamping roller (331) is located above and in the middle of the two driving rollers (322). The front and rear ends of the clamping roller (331) are rotatably connected to the front plate (312) and the rear plate (313) respectively. The front end of the clamping roller (331) is fixedly connected to the connecting rod (333). The rear end of the connecting rod (333) is rotatably connected to the front plate (312). The front end of the connecting rod (333) is fixedly connected to a gear (332). The other gear (332) is fixedly connected to a synchronous wheel of the pulley component (323). The two gears (332) are meshed and connected with each other.

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