CN216736703U

CN216736703U - Full-automatic packing belt winding equipment

Info

Publication number: CN216736703U
Application number: CN202123394881.4U
Authority: CN
Inventors: 李成秀; 刘永新; 李泽群
Original assignee: QINGDAO XINDACHENG PLASTIC MACHINERY CO Ltd
Current assignee: QINGDAO XINDACHENG PLASTIC MACHINERY CO Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-14
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a full-automatic packing belt winding device. Full-automatic packing area rolling equipment includes: a frame; the winding mechanism comprises a motor, a first telescopic component and two clamping components, the two clamping components are oppositely arranged and rotatably arranged on the rack, the first telescopic component is arranged on the rack and used for driving at least one clamping component to reciprocate, and the motor is arranged on the rack and used for driving one clamping component to rotate; feed mechanism, feed mechanism includes feed bin, propelling movement part, swing arm and anchor clamps, the feed bin is used for saving the refill, propelling movement part be used for with refill propelling movement in the feed bin arrives on the anchor clamps, the swing arm rotationally sets up in the frame and be located hold assembly's below, anchor clamps set up on the swing arm. The paper core can be automatically replaced to achieve full-automatic rolling, and the labor intensity of workers is reduced.

Description

Full-automatic packing belt winding equipment

Technical Field

The utility model relates to the technical field of machinery, in particular to full-automatic packing belt winding equipment.

Background

The packing belt has good elastic recovery, high strength, good water resistance, strong chemical resistance, light weight and softness, can be manually bundled and mechanically bundled, is convenient to use and low in cost, and is widely applied to the packaging and transportation industry. After the packaging belt is formed, the packaging belt needs to be rolled, and Chinese patent publication No. CN 107826877A discloses a double-station multi-roll-diameter packaging belt rolling machine, which adopts two stations to alternately place paper cores to roll the packaging belt. In the actual use process, although two stations are adopted for winding the packing belt, after the winding of the packing belt is completed, a new paper core needs to be manually disassembled and installed, so that the automation degree of equipment is low, and the labor intensity of workers is high. The utility model aims to solve the technical problem of how to design a technology for fully automatically winding and reducing the labor intensity of workers.

SUMMERY OF THE UTILITY MODEL

The utility model provides a full-automatic packing belt winding device, which realizes automatic paper core replacement to achieve full-automatic winding and reduces the labor intensity of workers.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a full-automatic packing belt winding device, which comprises:

a frame;

the winding mechanism comprises a motor, a first telescopic component and two clamping components, the two clamping components are oppositely arranged and rotatably arranged on the rack, the first telescopic component is arranged on the rack and used for driving at least one clamping component to reciprocate, and the motor is arranged on the rack and used for driving one clamping component to rotate;

feed mechanism, feed mechanism includes feed bin, propelling movement part, swing arm and anchor clamps, the feed bin is used for saving the refill, propelling movement part be used for with refill propelling movement in the feed bin arrives on the anchor clamps, the swing arm rotationally sets up in the frame and be located hold assembly's below, anchor clamps set up on the swing arm.

Further, a conveying belt is arranged below the rack and is located below the clamping component.

Further, the clamping component is of a disc structure, and a chamfer is arranged on the edge of the disc structure.

Further, winding mechanism still includes first slip table and first slide, first slide slidable ground sets up on the first slip table, first slip table sets up in the frame, be provided with rotationally first pivot on the first slide, be provided with in the first pivot hold assembly, the motor sets up on the first slide and with first pivot transmission is connected, first extensible member connects the frame with between the first slide.

Further, winding mechanism still includes second slip table, second slide and the flexible part of second, second slide slidable ground sets up on the second slip table, the second slip table sets up in the frame, be provided with rotationally the second pivot on the second slide, be provided with in the second pivot clamping component, the flexible part of second is connected the frame with between the second slide.

Furthermore, a third telescopic part is arranged on one of the clamping parts, a pressure plate is arranged at the free end of the third telescopic part, and the pressure plate stretches across the edge of the clamping part and extends towards the other clamping part.

Further, feed mechanism includes base, trip shaft and first driver part, the swing arm sets up on the trip shaft, driver part is used for the drive the trip shaft rotates.

Further, the clamp comprises a supporting piece and a clamping piece, the clamping piece is rotatably arranged at the free end of the supporting piece, and a second driving part used for driving the clamping piece to rotate is further arranged on the supporting piece.

Further, the cross section of the supporting piece is of a circular arc structure.

Further, still include tension control mechanism, tension control mechanism includes mounting panel, two first deflector rolls, second deflector roll, linking arm, spring and angle sensor, two first deflector roll rotationally sets up on the mounting panel, a tip of linking arm rotationally sets up on the mounting panel, the second deflector roll rotationally sets up another tip of linking arm, the second deflector roll is located two between the first deflector roll, the spring coupling be in the linking arm with between the mounting panel, angle sensor sets up be used for measuring on the mounting panel the turned angle of linking arm, the mounting panel sets up in the frame.

Compared with the prior art, the technical scheme of the utility model has the following technical effects: by arranging the winding mechanism and the feeding mechanism on the rack, in the actual use process, the feeding mechanism can automatically place the paper core between the two clamping components of the winding mechanism so as to realize automatic feeding; simultaneously, two clamping parts press from both sides tight refill and are rotated in order to realize the rolling operation by motor drive to, after the rolling is accomplished, two clamping parts keep away from each other, and the refill falls in order to realize automatic unloading under the action of gravity, need not the manual work to operate to the unloading of refill, realize changing the refill in order to reach full-automatic rolling automatically, and reduce workman's intensity of labour.

Drawings

FIG. 1 is a schematic structural view of a fully automatic packaging tape winding apparatus according to the present invention;

FIG. 2 is a second schematic structural view of the fully automatic packing belt winding apparatus of the present invention;

FIG. 3 is a third schematic structural view of the fully automatic packing belt winding apparatus of the present invention;

FIG. 4 is a schematic structural view of a winding mechanism in the fully automatic packing belt winding apparatus of the present invention;

FIG. 5 is a second schematic structural view of a winding mechanism in the fully automatic packing belt winding apparatus of the present invention;

FIG. 6 is a schematic structural view of a feeding mechanism in the fully automatic packing belt winding apparatus according to the present invention;

FIG. 7 is a second schematic structural view of a feeding mechanism in the fully automatic packing belt winding apparatus of the present invention;

FIG. 8 is a schematic structural view of a tension control mechanism in the fully automatic packing belt take-up device of the present invention;

fig. 9 is a sectional view taken along line a-a in fig. 8.

Reference numerals:

a frame 1;

a guide plate 11, a conveyor belt 12;

a winding mechanism 2;

the device comprises a motor 21, a first telescopic component 22, a clamping component 23, a first sliding table 24, a first sliding seat 25, a second sliding table 26, a second sliding seat 27, a second telescopic component 28 and a third telescopic component 29;

chamfer 231, pressure plate 291;

a feeding mechanism 3;

the device comprises a bin 31, a pushing component 32, a swing arm 33, a clamp 34, a base 35, a turnover shaft 36, a first driving component 37 and a limiter 38;

a supporting member 341, a clamping member 342, a second driving member 343;

a tension control mechanism 4;

the device comprises a mounting plate 41, a first guide roller 42, a second guide roller 43, a connecting arm 44, a spring 45, an angle sensor 46, a meter-counting controller 47 and a connecting rod 48;

a first sub-spring 451, a second sub-spring 452, a sleeve 481, a nut 482;

a paper core 100.

Detailed Description

As shown in fig. 1 to 9, the present invention provides a fully automatic packing belt winding apparatus, comprising:

a frame 1;

the winding mechanism 2 comprises a motor 21, a first telescopic part 22 and two clamping parts 23, the two clamping parts are oppositely arranged and rotatably arranged on the rack 1, the first telescopic part 22 is arranged on the rack 1 and is used for driving at least one clamping part to reciprocate, and the motor 21 is arranged on the rack 1 and is used for driving one clamping part 23 to rotate;

feed mechanism 3, feed mechanism 3 include feed bin 31, propelling movement part 32, swing arm 33 and anchor clamps 34, and feed bin 31 is used for storing refill 100, the propelling movement part is arranged in with refill propelling movement in feed bin 31 on anchor clamps 34, swing arm 33 rotationally sets up in frame 1 and is located the below of clamping part 23, anchor clamps 34 set up on swing arm 33.

Specifically, install winding mechanism 2 and feed mechanism 3 on the frame 1, in the use, place a plurality of refill in advance in the feed bin 31, during the refill of bottommost passes through propelling movement part 32 and pushes into anchor clamps 34, the refill is held the back by anchor clamps 34 with, and swing arm 33 rotates so that refill 100 is located between two hold assembly 23, and then realizes automatic feeding.

The first telescopic member 22 drives the gripping members to move so that both gripping members grip the core, and then the motor 21 drives the gripping members 23 to rotate. Meanwhile, the produced packing belt is wound on the paper core, and the paper core continuously rotates to complete the rolling of the packing belt.

After the wrapping belt on the paper core is wrapped, the first telescopic part 22 drives the clamping parts 23 to be away from each other, so that the paper core automatically falls off between the two clamping parts, and automatic blanking is realized.

Preferably, the bottom of the frame 1 is further provided with a guide plate 11, and the guide plate 11 extends obliquely downwards; the guide plate 11 is located below the clamping member 23.

Specifically, after the packing belt is wound on the paper core, the paper core falls off from between the two clamping parts 23 and falls onto the guide plate 11 at the bottom. The wound core is guided by a guide plate 11 and rolled onto a conveyor belt 12 disposed below to realize automatic conveyance.

For the whole equipment of the full-automatic strapping band winding device, it is configured with relevant mechanisms in the conventional strapping band winding machine, such as the automatic cutting mechanism 5, the automatic wire arranging mechanism 6, etc., and the structural form of the conventional mechanism in the strapping band winding machine is not limited and described herein.

The first telescopic member 22, the second telescopic member 28, the third telescopic member 29, the pushing member 32, the first driving member 37, and the second driving member 343 may be embodied by a cylinder, an electric push rod, or the like, but are not limited thereto.

By arranging the winding mechanism and the feeding mechanism on the rack, in the actual use process, the feeding mechanism can automatically place the paper core between the two clamping components of the winding mechanism so as to realize automatic feeding; simultaneously, two clamping part press from both sides tight refill and rotate in order to realize the rolling operation by motor drive to, after the rolling is accomplished, two clamping part keep away from each other, the refill under the action of gravity, automatic whereabouts is in order to realize automatic unloading, need not the manual work to the unloading of refill and operates, realize automatic change refill in order to reach full-automatic rolling, and reduce workman's intensity of labour.

Further, winding mechanism 2 still includes first slip table 24 and first slide 25, and first slide 25 slidable ground sets up on first slip table 24, and first slip table 24 sets up in frame 1, is provided with rotationally first pivot (unmarked) on the first slide 25, be provided with clamping component 23 in the first pivot, motor 21 set up on first slide 25 and with first pivot transmission is connected, and first extensible member 22 is connected between frame 1 and first slide 25.

Specifically, the frame 1 is provided with a first sliding table 24, the first sliding table 24 is provided with a first sliding base 25, the first sliding base 25 is used for installing the corresponding clamping component, and meanwhile, the first telescopic component 22 drives the first sliding base 25 to slide on the first sliding table 24 in a reciprocating manner, so that one clamping component 23 is close to or away from the other clamping component 23. The motor 21 is disposed on the first carriage 25, and the holding member 23 on the first carriage 25 is rotated by the motor 21.

Similarly, the other clamping component 23 can also be installed in a sliding manner, for this reason, the winding mechanism 2 further includes a second sliding table 26, a second sliding base 27 and a second telescopic component 28, the second sliding base 27 is slidably disposed on the second sliding table 26, the second sliding table 26 is disposed on the frame 1, a rotatable second rotating shaft is disposed on the second sliding base 27, the clamping component 23 is disposed on the second rotating shaft, and the second telescopic component 28 is connected between the frame 1 and the second sliding base 27.

Specifically, for better clamping and releasing the paper core, the two clamping members 23 are slidably mounted, and in use, the first telescopic member 22 and the second telescopic member 28 drive the corresponding clamping members 23 to slide relatively, so as to clamp or release the paper core 100.

More preferably, in order to clamp the paper core 100 by the two clamping members 23 more accurately, the edges of the clamping end surfaces of the two clamping members 23 are chamfered, that is, the clamping members 23 are in a disc structure, and the edges of the disc structure are provided with chamfers 231.

Specifically, in the process of sandwiching the paper core 100 by the two sandwiching members 23, as the two sandwiching members 23 approach each other, the small diameter end portions of the sandwiching members 23 are inserted into the through hole of the paper core 100 and guided via the slope of the chamfer 231. And then after step up the refill 100 through two hold-down part 23, under the effect of chamfer 231, can realize the axis of refill 100 and the axis collineation of hold-down part 23, like this, alright in order to ensure the accurate installation of refill 100 in order to improve rolling quality.

Still further, for the convenience of clamping the packing belt before rolling, a third telescopic member 29 may be provided on one of the clamping members 23, and a pressing plate 291 may be provided at a free end of the third telescopic member 29, the pressing plate 291 extending across an edge of the clamping member 23 and extending toward the other clamping member 23.

Specifically, the third telescopic member 29 can drive the pressing plate 291 to approach or be away from the edge of the clamping member 23, and before rolling, the packing belt is clamped between the pressing plate 291 and the edge of the clamping member 23, so that when the motor 21 drives the clamping member 23 to rotate, the packing belt can be firmly wound on the paper core. And after the strapping band is wound on the paper core for a certain number of turns, the third telescopic member 29 drives the pressing plate 291 to move away from the edge of the clamping member 23 to loosen the strapping band.

In the second embodiment, based on the above technical solution, optionally, for the feeding mechanism 3, in order to facilitate installation and fixation, the feeding mechanism 3 includes a base 35, a turning shaft 36, and a first driving part 37, and the swing arm 33 is disposed on the turning shaft 36, and the driving part is used for driving the turning shaft 36 to rotate.

Specifically, the base 35 can be fixed at the bottom of the rack 1 to support the mounting turning shaft 36, and the swing arm 33 is fixedly mounted on the turning shaft 36, and the first driving part 37 is used to drive the turning shaft 36 to rotate so as to rotate the swing arm 33, so that the swing arm 33 drives the clamp 34 to move up and down.

Further, in order to ensure that the paper core 100 can be firmly clamped by the clamp 34 when the paper core 100 is conveyed, and meanwhile, to meet the requirement of effectively releasing the paper core 100, the clamp 34 includes a supporting member 341 and a clamping member 342, the clamping member 342 is rotatably disposed at a free end portion of the supporting member 341, and a second driving member 343 for driving the clamping member 342 to rotate is further disposed on the supporting member 341.

Specifically, in the process of pushing the paper core in the bin 31 into the clamp 34 by the pushing member, the second driving member 343 drives the clamping member 342 to open, so that the pushing member can push the paper core onto the supporting member 341 conveniently. After the paper core 100 is pushed onto the supporting member 341, the second driving member 343 drives the locking member to clamp the paper core 100 on the supporting member 341.

When the paper core needs to be released, the second driving part 343 drives the clamping piece 342 to open, so that the paper core is taken out conveniently.

The cross section of the supporting member 341 is a circular arc structure. Specifically, the supporting member 341 is made of a plate body having an arc-shaped structure, so as to meet the requirement of attaching to the outer peripheral profile of the paper core. Similarly, the clamp 342 can be formed from an arcuate plate.

In addition, the bottom of the storage bin 31 is provided with a discharge hole, and the pushing component 32 is positioned at one side of the discharge hole.

Specifically, the pushing component may adopt an air cylinder as power, a piston rod of the air cylinder is configured with a pushing frame, and the paper core is pushed out from a discharge port at the bottom and enters the clamp 34 by the pushing frame.

Further, in order to accurately control the swing position of the swing arm 33, a stopper 38 may be provided. Specifically, stopper 38 sets up on base 35, restricts the reciprocal swing position of swing arm 33 through stopper 38, and then satisfies the requirement of accurate feeding and accurate material loading.

After the swing arm 33 drives the clamp 34 to descend, the clamp 34 is located on the other side of the discharge hole.

Taking feeding as an example, the swing arm 33 swings downward until the lower stopper 38 is triggered, and the first driving part 37 stops providing power, so that the swing arm 33 stops at the position limited by the lower stopper 38. In this way, the clamp 34 can be accurately positioned at the discharge port of the bin 31, so as to ensure that the paper core pushed out by the pushing component can be accurately inserted into the clamp 34.

Third embodiment, based on the above technical scheme, optionally, in order to in the rolling process, the stress of the rolling packing belt is even, so as to improve the rolling quality, make the rolling equipment of full-automatic packing belt still includes tension control mechanism 4, and tension control mechanism 4 includes mounting panel 41, two first deflector rolls 42, second deflector roll 43, connecting arm 44, spring 45 and angle sensor 46, and two first deflector rolls 42 rotationally set up on mounting panel 41, and one end of connecting arm 44 rotationally sets up on mounting panel 41, and second deflector roll 43 rotationally sets up another tip at connecting arm 44, and second deflector roll 43 is located between two first deflector rolls 42, and spring 45 connects between connecting arm 44 and mounting panel 41, and angle sensor 46 sets up on mounting panel 41 and is used for measuring the turned angle of connecting arm 44.

Specifically, for the strapping tape to be wound on the paper core 100, the strapping tape is guided by the tension control device and then wound on the paper core 100, and the rotation speed control of the paper core 100 can be adjusted by the tension control device during the rotation of the paper core 100.

The strapping band is guided first by a first guide roller 42, then passes around the second guide roller and finally is guided out of the other first guide roller. In the process that the packing belt is conveyed by the three guide rollers, the force applied to the second guide roller by the packing belt is different due to different conveying speeds of the packing belt, and therefore the connecting arm 44 can rotate at a certain angle.

And after the connecting arm 44 takes place the angle, angle sensor 46 will detect the angle change that connecting arm 44 takes place, the rotational speed of the corresponding regulation refill 100 of angle value that detects according to angle sensor 46, and then make the winding degree of compactness of packing area can remain stable, and then improve the rolling quality.

Further, the tension control mechanism 4 further comprises a meter controller 47, and the meter controller 47 is disposed on the mounting plate 41 and is used for measuring the linear speed of the packing belt on the first guide roller 42.

Specifically, the meter controller 47 can measure the strapping band conveyed via the first guide roller 42, and further calculate the conveying length of the strapping band. The angle and the meter number information detected by the angle sensor 46 and the meter controller 47 can more accurately control the rotating speed of the paper core 100 to be kept in a reasonable interval, and then a tight packing belt is wound on the paper core.

Wherein, along the conveying direction of the packing belt, the meter controller 47 is arranged at the first guide roller 42 at the rear side in the conveying direction.

Specifically, the meter controller 47 is arranged on the first guide roller 42 close to the paper core, so that the meter controller 47 can more accurately detect the number of meters of the packing belt.

Further, the mounting plate 41 is provided with a rotatable connecting rod 48, and the spring 45 is sleeved on the connecting rod 48.

Specifically, the spring 45 is mounted on the mounting plate 41 through the connecting rod 48, and the connecting rod 48 can rotate freely, so that when the connecting arm 44 rotates, the spring 45 provides a spring force for the connecting arm 44, and meanwhile, the connecting rod 48 rotates adaptively, so that the spring 45 provides a better elastic restoring force for the connecting arm 44.

The spring 45 comprises a first sub spring 451 and a second sub spring 452, the first sub spring 451 and the second sub spring 452 are sleeved on the connecting rod 48, a sleeve 481 is further arranged on the connecting rod 48, and the sleeve 481 is located between the first sub spring and the second sub spring 452.

Specifically, in order to facilitate the spring 45 to provide the elastic force to the connecting arm 44, the spring 45 is divided into a first sub-spring 451 and a second sub-spring 452. The sleeve 481 can slide on the connecting rod 48 and is located between the first sub-spring 451 and the second sub-spring 452, and the connecting arm 44 is connected to the sleeve 481, so that the connecting arm 44 moves the sleeve 481 to press the first sub-spring 451 and the second sub-spring 452.

In addition, the free end of the connecting rod 48 is provided with a threaded portion on which a nut 482 is threadedly connected.

Specifically, the nut 482 is screwed to the free end of the connecting rod 48, so that the first sub-spring 451 and the second sub-spring 452 are limited and mounted on the connecting rod 48 by the nut 482 without falling off, and the pre-compression force of the two sub-springs can be adjusted by adjusting the position of the nut 482, so that the winding compactness of the packing belt can be adjusted.

The fourth embodiment of the utility model further provides a control method of the full-automatic packing belt winding device, which comprises the following steps: the pushing component pushes out a paper core in the stock bin and sends the paper core into the clamp, and the swing arm rotates to drive the clamp to ascend between the two clamping components; first telescopic part drive clamping part is close to each other so that the refill presss from both sides between two clamping part, then, motor drive clamping part rotates in order to wrap up the packing area through the refill.

Specifically, based on the fully automatic packing belt winding device in the above embodiment, in the actual use process, an operator puts a plurality of paper cores into the stock bin in advance for storage, and then pushes out one paper core at the bottom of the stock bin 31 from the discharge port through the pushing component 32 and enters the fixture 34.

Then, the swing arm 33 brings the gripper 34 up between the gripping members 23, and the two gripping members 23 grip the core on the gripper 34 to complete automatic feeding.

In the winding process of the paper core, the paper core realizes automatic feeding through the feeding mechanism 3, and the paper core can be automatically clamped through the two clamping components 23 in the winding mechanism 2, so that the full-automatic feeding of the paper core is realized.

The control method further comprises the following steps: after the rolling of packing area on the refill is accomplished, first flexible part drive clamping part 23 is kept away from each other so that the refill drops automatically, then, the swing arm drives once more and places the anchor clamps of refill and rise with the automatic paper core that supplies.

Specifically, after the paper core is rolled, the paper core is automatically dropped by separating the two clamping parts 23 from each other in the feeding operation of the paper core. Therefore, the paper core feeding and discharging can be fully automatically operated without manual treatment, and the labor intensity of workers is greatly reduced; and, when the refill is rolled, the pushing component 32 in the feeding mechanism 3 puts a new refill into the clamp 34, so as to realize continuous rolling operation, and further improve the production efficiency.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a rolling equipment is taken in full-automatic packing which characterized in that includes:

a frame;

2. The fully automatic packing belt winding device according to claim 1, wherein a conveyor belt is further disposed below the machine frame, and the conveyor belt is located below the clamping member.

3. The fully automatic packing belt winding device according to claim 1, wherein the clamping member is a disc structure, and the edge of the disc structure is provided with a chamfer.

4. The full-automatic packing area rolling equipment of claim 1, characterized in that winding mechanism still includes first slip table and first slide, first slide slidable ground sets up on the first slip table, first slip table sets up in the frame, be provided with rotationally first pivot on the first slide, be provided with in the first pivot clamping component, the motor sets up on the first slide and with first pivot transmission is connected, first extensible member connects the frame with between the first slide.

5. The full-automatic packing belt winding device according to claim 4, wherein the winding mechanism further comprises a second sliding table, a second sliding table and a second telescopic component, the second sliding table is slidably arranged on the second sliding table, the second sliding table is arranged on the frame, a rotatable second rotating shaft is arranged on the second sliding table, the clamping component is arranged on the second rotating shaft, and the second telescopic component is connected between the frame and the second sliding table.

6. The fully automatic strapping band take-up apparatus according to claim 1, wherein a third retractable member is provided on one of the clamping members, and a pressure plate is provided at a free end of the third retractable member, the pressure plate extending across an edge of the clamping member and extending in a direction toward the other clamping member.

7. The fully automatic packing belt rolling device according to claim 1, wherein the feeding mechanism comprises a base, a roll-over shaft and a first driving part, the swing arm is arranged on the roll-over shaft, and the driving part is used for driving the roll-over shaft to rotate.

8. The fully-automatic packing belt winding device according to claim 7, wherein the clamp comprises a supporting piece and a clamping piece, the clamping piece is rotatably arranged at the free end of the supporting piece, and a second driving part for driving the clamping piece to rotate is further arranged on the supporting piece.

9. The fully automatic packing belt take-up apparatus as claimed in claim 8, wherein the cross section of the support member is a circular arc structure.

10. The winding device in packing belt of any one of claims 1 to 9, further comprising a tension control mechanism, wherein the tension control mechanism comprises a mounting plate, two first guide rollers, a second guide roller, a connecting arm, a spring and an angle sensor, the two first guide rollers are rotatably disposed on the mounting plate, one end of the connecting arm is rotatably disposed on the mounting plate, the second guide roller is rotatably disposed at the other end of the connecting arm, the second guide roller is located between the two first guide rollers, the spring is connected between the connecting arm and the mounting plate, the angle sensor is disposed on the mounting plate and is used for measuring the rotation angle of the connecting arm, and the mounting plate is disposed on the frame.