Slow-up device facilitating adhesive tape roll replacement

By designing a slow-delay device that facilitates tape roll changing, and utilizing the cooperation of support rollers and gear structures, the automatic adjustment and winding of the tape roll is achieved, solving the problem of tape accumulation caused by sensor misjudgment and improving production efficiency and product quality.

CN223704614UActive Publication Date: 2025-12-23DONGGUAN SUIYING NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202520001081.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2025-12-23
Estimated Expiration
2035-01-02

AI Technical Summary

Technical Problem

In existing tape production lines, tape accumulation occurs during roll changing due to sensor misjudgments, affecting production efficiency and product quality.

Method used

Design a slow-delay device to facilitate tape roll changing. Through the cooperation of support rollers and gear structure, the tape roll can be automatically adjusted and wound up, avoiding tape accumulation. Combined with the adjustment mechanism, the fixing of the winding roller can be adjusted according to the tape size to ensure smooth tape operation.

Benefits of technology

It effectively reduces the accumulation of tape inside the machine, improves production efficiency, and ensures product quality and production continuity.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of adhesive tape production, and discloses a delay device convenient for adhesive tape roll replacement, which comprises a support, a plurality of grooves are formed in the left side and the right side in the support, sliding rails are fixedly connected to the left sides in the grooves, the right ends of the sliding rails are slidably connected with sliding blocks, and the sliding blocks are fixedly connected to the left sides of the sliding rails. The front side and the rear side of the interior of the support are each fixedly connected with two first connecting plates, the tops of the two first connecting plates at the bottom are each fixedly connected with a plurality of fixing plates, and supporting rollers are fixedly connected between the two first connecting plates at the top and the adjacent portions of the multiple fixing plates. According to the utility model, the telescopic rod stretches out and draws back to enable the supporting block on the right side to move, the rack is connected with the supporting block to drive the bottom gear to move, the bottom connecting plate I moves on the sliding rail to drive the supporting roller to move up and down, and the supporting roller returns to the original position after the winding drum is replaced, so that the situation that the adhesive tape is accumulated in the machine body to influence processing is reduced; and the production efficiency is improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to adhesive tape production technical field especially, relate to a kind of slow device that facilitates adhesive tape change volume. BACKGROUND

[0002] The production line of industrial adhesive tape includes multiple processes of unwinding, gluing, drying and winding. In order to ensure the continuity and efficiency of production, the processes must be seamlessly connected. However, in actual production, the change of adhesive tape volume requires a certain amount of time, and the interruption of the production line during this period will cause the adhesive tape to wrinkle and the winding to be irregular, resulting in quality problems, which seriously affects the final quality of the product. Therefore, a slow device for facilitating adhesive tape change volume is invented.

[0003] The slow device for facilitating adhesive tape change volume is a device used in adhesive tape production equipment or adhesive tape use equipment. Its function is to slow down or pause the operation of the equipment when the adhesive tape volume is about to run out and needs to be replaced, thereby providing enough time for the operator to perform the change operation and avoiding equipment failure or other adverse conditions due to sudden interruption of the adhesive tape.

[0004] In the existing production line, a slow device is added to detect the remaining amount of adhesive tape by relying on a sensor. However, the sensor may be affected by environmental factors or the characteristics of the adhesive tape itself, resulting in misjudgment. When the sensor makes a mistake, it will not trigger the change signal when there is still a large amount of remaining adhesive tape, and the adhesive tape will continue to be transported, which will easily accumulate in the machine body, reducing production efficiency. UTILITY MODEL CONTENT

[0005] To make up for the above shortcomings, the utility model provides a slow device for facilitating adhesive tape change volume, which aims to improve the problem of reducing production efficiency caused by the continuous transportation of adhesive tape when the sensor makes a mistake in the prior art.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a kind of slow device that adhesive tape roll is replaced easily, including support, the inside left and right sides of support are all provided with multiple grooves, the inside left side of multiple grooves is all fixedly connected with slide rail, the right end of multiple slide rails is all slidingly connected with sliding block, the inside front and back sides of support are all fixedly connected with two connecting plates one, the top of bottom two connecting plates one is all fixedly connected with multiple fixed plates, the adjacent between top two connecting plates one and multiple fixed plates is all fixedly connected with support roller, the front and back sides of top two connecting plates one are all fixedly connected with two gears, the front and back sides of bottom two connecting plates one are all fixedly connected with gear, the front right side left end of support is all fixedly connected with support block, the outer wall of multiple gears is all engagedly connected with rack, the bottom of right side two support blocks is all fixedly connected with telescopic link, the bottom of two telescopic links is all fixedly connected with support plate one, the right side of support is provided with support frame, the inside of support frame is fixedly connected with multiple guide rollers, the inside right side of support frame is fixedly connected with winding roller, the front left end of support frame is fixedly connected with motor, the outer wall of winding roller is provided with adjusting mechanism.

[0007] Through the above technical scheme: support as support component, its inside left and right sides are provided with multiple grooves, groove provides installation position for slide rail, and the left side of multiple grooves is fixed with slide rail, and the right end of slide rail has the sliding block that can move up and down, and the inside front and back sides of support are all fixedly connected with two connecting plates one, and the top of bottom two connecting plates one has multiple fixed plates, and the adjacent between top two connecting plates one and multiple fixed plates is fixed with support roller, and adhesive tape can be wound on support roller, and the front and back sides of top and bottom two connecting plates one are all fixed with gear, and the right side support block is moved up and down by the telescopic link of right side support block bottom telescopic, because rack is connected with support block, will drive bottom gear to move, let bottom connecting plate one move on slide rail, and it is moved up and down by sliding block and slide rail cooperation, winding device continues to work after winding drum replacement, support roller returns to original position, to reduce the situation that adhesive tape is accumulated in machine body and affects processing, improve production efficiency.

[0008] As further description of the above technical scheme:

[0009] The adjusting mechanism includes fixed block, the fixed block is fixedly connected in the right side slot, the outer wall of winding roller is provided with multiple slots on top, the outer wall right side of winding roller is slidingly connected with baffle, the rear right end of support frame is fixedly connected with support plate two, the rear bottom of support plate two is fixedly connected with two hinges, the middle of support plate two is fixedly connected with clamping strip.

[0010] Through the technical scheme, the top of the outer wall of the winding roller is provided with a plurality of notches, the fixing block is located in the right notch, when it is necessary to adjust according to the size of the adhesive tape, the fixing block is taken out, the baffle is moved left and right according to the size of the adhesive tape, is moved to the appropriate position, the fixing block is inserted into the corresponding notch, and the baffle on the right side of the outer wall of the winding roller is prevented from falling out in a sliding connection mode, so that the size of the adhesive tape can be adjusted, and the adhesive tape is prevented from being disorderly wound on the winding roller.

[0011] As a further description of the above technical scheme:

[0012] The bottom of the support is fixedly connected with a foot pad at four corners, and the bottom of the plurality of foot pads is fixedly connected with a plurality of anti-skid pipes.

[0013] Through the above technical scheme: the bottom of the support is provided with a foot pad at four corners, and the bottom of the foot pad is fixedly connected with a plurality of anti-skid pipes, so that the device can be prevented from moving and the friction with the ground is enhanced.

[0014] As a further description of the above technical scheme:

[0015] The right bottom of the support is fixedly connected with two fixed seats, and the adjacent fixed seats are fixedly connected with a limiting roller.

[0016] Through the above technical scheme: the right bottom of the support is provided with two fixed seats, and the adjacent fixed seats are fixedly connected with a limiting roller, so that the adhesive tape can run more smoothly.

[0017] As a further description of the above technical scheme:

[0018] The right end of the front side of the support frame is fixedly connected with a connecting plate two, and the top of the connecting plate two is fixedly connected to the bottom of the motor.

[0019] Through the above technical scheme: the right end of the front side of the support frame is fixedly connected with a connecting plate two, and the bottom of the motor is fixed to the top of the connecting plate two, so that the connecting plate two supports the motor.

[0020] As a further description of the above technical scheme:

[0021] The right end of the front side of the support frame is fixedly connected with two support rods, and the top of the two support rods is fixedly connected to the bottom of the connecting plate two.

[0022] Through the above technical scheme: the right end of the front side of the support frame is fixedly connected with two support rods, and the top of the two support rods is fixedly connected to the bottom of the connecting plate two, so that the support force on the connecting plate two is enhanced.

[0023] As a further description of the above technical scheme:

[0024] The top of the connecting plate two is fixedly connected with a dustproof box, and the left and right sides of the dustproof box are provided with ventilation openings.

[0025] Through the above technical scheme, the dustproof box is fixed on the top of the connecting plate two, and the dustproof box is provided with ventilation openings on the left and right sides, so that the ventilation is facilitated.

[0026] As a further description of the above technical scheme:

[0027] The front side of the dustproof box is fixedly connected with a fan, and the four corners of the front side of the fan are screw-connected with screws.

[0028] Through the above technical scheme, the dustproof box is fixed on the top of the connecting plate two, and the dustproof box is provided with ventilation openings on the left and right sides, so that the ventilation is facilitated.

[0029] The utility model has the advantages of the following beneficial effects:

[0030] 1、the utility model discloses, through right side support block bottom telescopic link telescoping, make right side support block up and down movement, because the rack is connected with the support block, will drive the bottom gear to move, let bottom connecting plate one move on the slide rail, and it is through the cooperation of the sliding block and the slide rail, drives the support roller up and down, and after the winding drum is changed, the winding device continues to work, and the support roller returns to the original position, thereby realize the situation that the adhesive tape is reduced and is accumulated in the machine body and affects processing, improve production efficiency.

[0031] 2、the utility model discloses, when needing to adjust according to the size of adhesive tape, take out the fixed block, and move the baffle to the left and right according to the size of adhesive tape, move to the appropriate position, and insert the fixed block into the corresponding slot, and the baffle on the right side of the winding roller outer wall prevents the adhesive tape from falling out in a sliding connection mode, so that the size of the adhesive tape can be adjusted, and the adhesive tape is prevented from being disorderly wound on the winding roller. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A perspective view of a slow device convenient for adhesive tape roll changing is provided for the utility model;

[0033] Figure 2 A front view of a slow device convenient for adhesive tape roll changing is provided for the utility model;

[0034] Figure 3 A rear view of a slow device convenient for adhesive tape roll changing is provided for the utility model;

[0035] Figure 4 A structural schematic view of a slide rail of a slow device convenient for adhesive tape roll changing is provided for the utility model;

[0036] Figure 5The utility model provides a kind of fixed block's structure schematic view of slow device convenient to tape change volume.

[0037] Legend:

[0038] 1, support;2, adjusting mechanism;201, notched;202, fixed block;203, baffle;204, support plate two;205, hinge;206, clamping strip;3, recess;4, slide rail;5, sliding block;6, connecting plate one;7, fixed plate;8, support roller;9, gear;10, support block;11, rack;12, telescopic rod;13, support plate one;14, support frame;15, guide roller;16, winding roller;17, motor;18, foot pad;19, antiskid pipe;20, fixed seat;21, limiting roller;22, connecting plate two;23, support rod;24, dustproof box;25, air vent;26, fan;27, screw. Specific implementation

[0039] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0040] Refer to Figure 1 , Figure 4 and Figure 5The utility model provides a kind of embodiment: a kind of slow device convenient for adhesive tape to change roll, including support 1, for support, the inside left and right sides of support 1 are all provided with multiple grooves 3, provide mounting position for slide rail 4, the inside left side of multiple grooves 3 is all fixedly connected with slide rail 4, the right end of multiple slide rails 4 is all slidingly connected with sliding block 5, sliding block 5 can move up and down on slide rail 4, the inside front and back sides of support 1 are all fixedly connected with two connecting plates one 6, the top of bottom two connecting plates one 6 is all fixedly connected with multiple fixed plates 7, the adjacent between top two connecting plates one 6 and multiple fixed plates 7 is all fixedly connected with support roller 8, adhesive tape is wound on multiple support rollers 8, the front and back sides of top two connecting plates one 6 are all fixedly connected with two gears 9, the front and back sides of bottom two connecting plates one 6 are all fixedly connected with gear 9, the front right side left end of support 1 is all fixedly connected with support block 10, the outer wall of multiple gears 9 is all engagedly connected with rack 11, the bottom of right side two support blocks 10 is all fixedly connected with telescopic link 12, and the right side support block 10 is moved up and down by the expansion of telescopic link 12, both ends of rack 11 are fixed on two support blocks 10, and the expansion of telescopic link 12 makes that rack 11 drives bottom gear 9 to move up and down, bottom gear 9 is connected with bottom connecting plate one 6, so connecting plate one 6 can move up and down on slide rail 4, the bottom of two telescopic links 12 is all fixedly connected with support plate one 13, for support, the right side of support 1 is provided with support frame 14, the inside of support frame 14 is fixedly connected with multiple guide rollers 15, for guiding adhesive tape, the inside right side of support frame 14 is fixedly connected with winding roller 16, for winding adhesive tape, the front left end of support frame 14 is fixedly connected with motor 17, and motor 17 rotates to drive winding roller 16 to rotate, and the outer wall of winding roller 16 is provided with adjusting mechanism 2;

[0041] Specific, support 1 as a support component, its inside left and right sides are provided with a plurality of grooves 3, groove 3 is provided with a plurality of mounting position for slide rail 4, in a plurality of groove 3 left side fixed with slide rail 4, the right end of slide rail 4 has a movable slider 5, support 1 inside front and back side are fixedly connected with two connecting plate 6, the top of the two connecting plate 6 at the bottom has a plurality of fixed plate 7, the top of the two connecting plate 6 and a plurality of fixed plate 7 adjacent between fixed with support roller 8, adhesive tape can be wound on the support roller 8, the front and back side of the top and bottom two connecting plate 6 are fixed with gear 9, the front right side of support 1 is fixed with support block 10, a plurality of gear 9 outer wall and rack 11 meshing connection, the bottom of the right two support block 10 has telescopic rod 12, telescopic rod 12 telescopic can drive the right side support block 10 up and down, because the rack 11 both ends are fixed on the two support block 10, so when the telescopic rod 12 telescopic, rack 11 will drive the bottom gear 9 up and down, again because the bottom gear 9 is connected with the bottom connecting plate 6, so that the connecting plate 6 can move up and down on the slide rail 4, the bottom of the two telescopic rod 12 has support plate 13 for supporting, support 1 right side is provided with support frame 14, its inside is fixed with a plurality of guide roller 15, for guiding the direction of the adhesive tape, in the inside right side of support frame 14 has winding roller 16, for winding adhesive tape, while in the front side left end of support frame 14 is fixed with motor 17, motor 17 rotation can drive winding roller 16 rotation.

[0042] Referring to Figure 1 And Figure 5 , adjusting mechanism 2 includes fixed block 202, fixed block 202 fixedly connected in the right side of the slot 201 inside, winding roller 16 outer wall top is provided with a plurality of slot 201, for placing fixed block 202, the outer wall of winding roller 16 right side is slidably connected with baffle 203, for stopping the adhesive tape fall out, the right end of the back side of support frame 14 is fixedly connected with support plate 204, for supporting winding roller 16, the back side of the bottom of support plate 204 is fixedly connected with two hinges 205, for facilitating opening support plate 204, the middle of support plate 204 is fixedly connected with clamping strip 206, for clamping support plate 204, prevent support plate 204 support, pull out clamping strip 206 when disassembling;

[0043] Specific, the outer wall of the winding roller 16 top opening has a plurality of slots 201, fixed block 202 is fixed in the right slot 201 inside, the outer wall of the winding roller 16 right side is connected with the baffle 203, the baffle 203 can effectively prevent the adhesive tape from falling off the winding roller 16, the support plate two 204 is fixed at the rear right end of the support frame 14, which provides support for the winding roller 16, the rear bottom of the support plate two 204 is provided with two hinges 205, which makes the support plate two 204 easy to open, the middle of the support plate two 204 is fixed with a clamping strip 206, which can prevent the support plate two 204 from being unstable during support, when disassembling, pull out the clamping strip 206.

[0044] With reference to Figure 1 and Figure 2 , the bottom four corners of the support 1 are fixedly connected with the foot pads 18, the bottoms of the plurality of foot pads 18 are fixedly connected with the plurality of anti-skid tubes 19, which prevents movement and increases friction, the right bottom of the support 1 is fixedly connected with the two fixed seats 20, the adjacent between the fixed seats 20 is fixedly connected with the limiting rollers 21, which increases the smoothness of the adhesive tape, the right front end of the support frame 14 is fixedly connected with the connecting plate two 22, the top of the connecting plate two 22 is fixedly connected at the bottom of the motor 17, which is used for support;

[0045] Specifically, the bottom four corners of the support 1 are provided with the foot pads 18, and the bottoms of the foot pads 18 are fixedly connected with the plurality of anti-skid tubes 19, which prevents movement and increases friction, the right bottom of the support 1 is provided with the two fixed seats 20, the adjacent between the two fixed seats 20 is fixedly connected with the limiting rollers 21, which enables the adhesive tape to run more smoothly, and the right front end of the support frame 14 is fixedly connected with the connecting plate two 22, and the bottom of the motor 17 is fixedly connected at the top of the connecting plate two 22, which plays a role in supporting the motor 17.

[0046] With reference to Figure 1 and Figure 2 , the right front end of the support frame 14 is fixedly connected with the two support rods 23, the tops of the two support rods 23 are fixedly connected at the bottom of the connecting plate two 22, which increases the support force, the top of the connecting plate two 22 is fixedly connected with the dustproof box 24, which protects the motor 17, the left and right sides of the dustproof box 24 are provided with the ventilation openings 25, which are used for ventilation, the front side of the dustproof box 24 is fixedly connected with the fan 26, which increases the heat dissipation, the front four corners of the fan 26 are threadedly connected with the screws 27, which are used for fixation;

[0047] Specific, the front right end of the support frame 14 is fixed with two support rods 23, its top is connected with the bottom of the connecting plate two 22, can enhance the support force of the connecting plate two 22, the top of the connecting plate two 22 is fixed with the dustproof box 24, can protect the motor 17, the dustproof box 24 left and right side is provided with the ventilation opening 25, is convenient for ventilation, the dustproof box 24 front side is fixed with the fan 26, can enhance the heat dissipation, the fan 26 front side four corners are all connected through the screw 27 thread, the screw 27 plays the role of fixed fan 26.

[0048] Working principle: support 1 as the foundation support, its inside left and right recesses 3 are positioned for slide rails 4, the left end of the slide rail 4 is fixed on the left side of the recess 3, the right end slider 5 can move up and down, the two connecting plates one 6 in front and back of the support 1 are key structures, the fixed plate 7 on the bottom of the two connecting plates one 6 is arranged between the top of the two connecting plates one 6, the support roller 8 is arranged for winding adhesive tape, the connecting plates one 6 in front and back of the up and down have gears 9, through the extension and contraction of the extension rod 12 at the bottom of the right two support blocks 10, the right support block 10 is driven to move up and down, since the rack 11 is fixed on the support block 10 at both ends, so the rack 11 will drive the bottom gear 9 to move up and down, and then the bottom connecting plate one 6 moves on the slide rail 4, the bottom gear 9 is connected with the bottom connecting plate one 6, so the bottom connecting plate one 6 moves up and down on the slide rail 4 through the slider 5, and drives the support roller 8 connected with the bottom connecting plate one 6 to move up and down, when replacing the winding device, the extension rod 12 is extended, the rack 11 drives the bottom gear 9 to descend, so that the bottom support roller 8 descends, and the tension of the adhesive tape is increased, after the completion of the winding drum replacement, the winding device continues to wind the adhesive tape which has not been wound, the bottom support roller 8 rises to the original position, the whole process reduces the accumulation of adhesive tape in the machine body, so as to improve the production efficiency;

[0049] And, the outer wall of the winding roller 16 is provided with a plurality of notches 201, and the fixed block 202 is located in the right notch 201, when it is necessary to adjust according to the size of the adhesive tape, the fixed block 202 is taken out, the baffle 203 is moved left and right according to the size of the adhesive tape, and is moved to the appropriate position, the fixed block 202 is inserted into the corresponding notch 201, the baffle 203 on the right side of the outer wall of the winding roller 16 is connected by sliding to prevent the adhesive tape from falling out, and the adhesive tape is always on the winding roller 16 during winding, the support plate two 204 at the right end of the back side of the support frame 14 provides support force for the winding roller 16, the two hinges 205 at the bottom facilitate the opening operation of the support plate two 204, and the clamping strip 206 in the middle of the support plate two 204 can enhance the stability of the support plate two 204 during supporting, so as to prevent the support plate two 204 from being unstable due to accidental factors, when it is necessary to disassemble the support plate two 204, the clamping strip 206 is pulled out, and then the subsequent operation is carried out, so that the size of the adhesive tape can be adjusted, and the adhesive tape is prevented from being disorderly on the winding roller 16.

[0050] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, the made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A device for facilitating the change of a roll of adhesive tape, comprising a support (1), characterized in that: The left and right sides of the support (1) are provided with a plurality of grooves (3), the left sides of the plurality of grooves (3) are fixedly connected with sliding rails (4), the right ends of the plurality of sliding rails (4) are slidably connected with sliding blocks (5), the front and back sides of the support (1) are fixedly connected with two connecting plates (6), the top of the two connecting plates (6) at the bottom is fixedly connected with a plurality of fixed plates (7), the adjacent positions between the two connecting plates (6) at the top and the plurality of fixed plates (7) are fixedly connected with supporting rollers (8), the front and back sides of the two connecting plates (6) at the top are fixedly connected with two gears (9), the front and back sides of the two connecting plates (6) at the bottom are fixedly connected with gears (9), the right front side of the support (1) is fixedly connected with supporting blocks (10), the outer walls of the plurality of gears (9) are meshingly connected with racks (11), the bottoms of the two supporting blocks (10) on the right side are fixedly connected with telescopic rods (12), the bottoms of the two telescopic rods (12) are fixedly connected with supporting plates (13), the right side of the support (1) is provided with a supporting frame (14), the inside of the supporting frame (14) is fixedly connected with a plurality of guide rollers (15), the right side of the inside of the supporting frame (14) is fixedly connected with a winding roller (16), the left end of the front side of the supporting frame (14) is fixedly connected with a motor (17), and the outer wall of the winding roller (16) is provided with an adjusting mechanism (2).

2. The hold-back device for facilitating tape roll changeover of claim 1, wherein: The adjusting mechanism (2) comprises a fixed block (202), the fixed block (202) is fixedly connected in the inside of the right side slot (201), a plurality of slots (201) are formed in the top of the outer wall of the winding roller (16), a baffle (203) is slidably connected to the right side of the outer wall of the winding roller (16), a supporting plate (204) is fixedly connected to the right end of the back side of the supporting frame (14), two hinges (205) are fixedly connected to the back side and bottom of the supporting plate (204), and a clamping strip (206) is fixedly connected to the middle of the supporting plate (204).

3. The hold-back device for facilitating tape roll changeover of claim 1, wherein: The bottoms of the four corners of the support (1) are fixedly connected with foot pads (18), and the bottoms of the plurality of foot pads (18) are fixedly connected with a plurality of anti-skid pipes (19).

4. The hold-back device of claim 1, wherein: The right bottom of the support (1) is fixedly connected with two fixed seats (20), and the adjacent positions of the fixed seats (20) are fixedly connected with limiting rollers (21).

5. The hold-back device of claim 1, wherein: The front right end of the supporting frame (14) is fixedly connected with a connecting plate (22), and the top of the connecting plate (22) is fixedly connected to the bottom of the motor (17).

6. The hold-back device for facilitating tape roll changeover of claim 1, wherein: The front right end of the supporting frame (14) is fixedly connected with two supporting rods (23), and the tops of the two supporting rods (23) are fixedly connected to the bottom of the connecting plate (22).

7. The hold-back device of claim 5, wherein: The top of the connecting plate (22) is fixedly connected with a dustproof box (24), and the left and right sides of the dustproof box (24) are provided with air vents (25).

8. The hold-back device of claim 7, wherein: The front side of the dustproof box (24) is fixedly connected with a fan (26), and the four corners of the front side of the fan (26) are threadedly connected with screws (27).