Automobile protective film unwinding equipment capable of automatically adjusting tension

Abstract

The utility model discloses automobile protective film unwinding equipment capable of automatically adjusting tension in the technical field of automobile film pasting, which comprises a platform, an unwinding assembly, a conveying assembly and a limiting assembly are arranged on the upper surface of the platform, and the conveying assembly comprises a first conveying shaft, a second conveying shaft and a fourth conveying shaft which are sequentially arranged from right to left. A third conveying shaft is arranged above the second conveying shaft, first sliding grooves are formed in the positions, corresponding to the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft, of the upper surface of the platform, a plurality of sliding blocks are slidably connected into the first sliding grooves, and a first limiting plate, a second limiting plate and a third limiting plate which are symmetrically arranged are fixedly connected to the sliding blocks. According to the protective film unwinding device, the unwinding position of a protective film can be continuously limited in the protective film unwinding process on the basis of automatically adjusting tension through the first limiting plate, the second limiting plate and the third limiting plate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile film, specifically is a kind of automatic tension-adjusting car protective film unwinding equipment. BACKGROUND

[0002] On the production line of car protective film, protective film is usually produced in the form of roll, in order to the need of subsequent processing (such as cutting, slitting, lamination etc.), it must be unwound from reel and transported smoothly.

[0003] Car protective film unwinding equipment is specially used for car protective film production process, to smoothly and continuously release protective film from raw material reel, so as to carry out subsequent processing or application.This kind of equipment plays a vital role in car protective film production line, its performance and stability directly affect production efficiency and product quality.

[0004] The existing car protective film unwinding equipment will exist uneven tension distribution of protective film in unwinding process, uneven winding speed and other factors when carrying out protective film unwinding, uneven winding speed will cause misplacement of protective film in winding process, this misplacement is due to winding acceleration or deceleration too fast, so that the relative position between film layers changes, thereby the position of protective film deviates, after the position deviation of protective film, it is difficult to maintain stable running state of protective film in unwinding process, the protective film with large deviation may be offset, twisted or wrinkled during unwinding, affect the smooth progress of subsequent processing or use. UTILITY MODEL CONTENTS

[0005] In order to solve the above problems, the utility model aims at providing a kind of car protective film unwinding equipment of automatic tension-adjusting, on the basis of automatic tension-adjusting, the unwinding position of protective film can be continuously limited during the process of protective film unwinding.

[0006] In order to achieve the above object, the technical scheme of the utility model is as follows: an automatic tension-adjusting automobile protection film unwinding equipment, comprising a platform, the upper surface of the platform is provided with an unwinding assembly, a conveying assembly and a limiting assembly; the unwinding assembly is located at one side of the top of the platform and is used for unwinding the automobile protection film, the conveying assembly is located at the side of the top of the platform far away from the unwinding assembly, the limiting assembly is located between the unwinding assembly and the conveying assembly, the conveying assembly comprises a first conveying shaft, a second conveying shaft and a fourth conveying shaft which are sequentially arranged from right to left, a third conveying shaft is arranged above the second conveying shaft, the limiting assembly comprises a plurality of limiting plates, the upper surface of the platform is provided with a first sliding groove corresponding to the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft, a plurality of sliding blocks are slidably connected in the first sliding groove, the first limiting plate, the second limiting plate and the third limiting plate which are symmetrically arranged are fixedly connected to the sliding blocks, the first conveying shaft can pass through the first limiting plate, the second conveying shaft and the third conveying shaft can pass through the second limiting plate, and the fourth conveying shaft can pass through the third limiting plate, and the first conveying shaft and the fourth conveying shaft are slidably connected with the first limiting plate and the third limiting plate respectively.

[0007] The principle of the basic scheme is that the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft can guide the unwinding path of the automobile protection film, the first limiting plate, the second limiting plate and the third limiting plate can move in the horizontal direction through the sliding cooperation of the sliding groove and the sliding block, and the horizontal position movement of the protection film can be limited through the first limiting plate, the second limiting plate and the third limiting plate.

[0008] The beneficial effects of the basic scheme are that: 1, the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft are beneficial to guiding the unwinding of the automobile protection film.

[0009] 2, the third conveying shaft is arranged above the second conveying shaft, the automobile protection film can pass through between the second conveying shaft and the third conveying shaft, which is beneficial to keeping the film surface taut during the unwinding process of the automobile protection film and avoiding loosening.

[0010] 3, the first limiting plate, the second limiting plate and the third limiting plate are beneficial to limiting the running track of the automobile protection film on the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft, and reducing the occurrence of position deviation of the automobile protection film during the unwinding process.

[0011] Further, the conveying assembly further comprises a first protective shell, a second protective shell and a third protective shell arranged in sequence from right to left, the first protective shell, the second protective shell and the third protective shell are fixedly connected to the upper surface of the platform, the first protective shell, the second protective shell and the third protective shell are symmetrically arranged along the transverse center line of the platform from right to left, the two ends of the first conveying shaft and the fourth conveying shaft are rotatably connected with the first protective shell and the third protective shell respectively, one end of the first conveying shaft and the fourth conveying shaft can extend to the outside of the first protective shell and the third protective shell through the first protective shell and the third protective shell, a second sliding groove is formed in the second protective shell, an electric telescopic rod is arranged in the second sliding groove, a plurality of sleeves are fixedly connected to the top of the electric telescopic rod, the sleeves are in sliding fit with the second sliding groove, the two ends of the second conveying shaft and the two ends of the third conveying shaft are rotatably connected with the sleeves respectively, the electric telescopic rod can drive the second conveying shaft and the third conveying shaft to move up and down through the sleeves, a first opening corresponding to the second sliding groove is arranged on the second limiting plate, the second conveying shaft and the third conveying shaft can move up and down in the second limiting plate, and one end of the second conveying shaft can extend to the outside through the second protective shell.

[0012] The beneficial effect of the basic scheme is that the height of the second conveying rod and the third conveying rod can be adjusted by the electric telescopic rod to adjust the tension during the unwinding process of the car protection film, and the first opening on the second limiting plate facilitates the smooth movement of the second conveying rod and the third conveying rod when adjusting the height of the second conveying rod and the third conveying rod.

[0013] Further, the unwinding assembly comprises a support plate fixedly connected to the top of the platform, a winding rod is rotatably connected to the support plate, and a lock disc is threadedly connected to the other end of the winding rod.

[0014] The beneficial effect of the basic scheme is that the wound car protection film can be sleeved on the winding rod, the lock disc is threadedly connected with the winding rod, which is conducive to tightly fixing the car protection film roll and stabilizing the car protection film during unwinding.

[0015] Further, the energy supply assembly comprises a first motor fixedly connected to the side of the support plate away from the winding rod, and the output shaft of the first motor is coaxially fixedly connected with the winding rod.

[0016] The beneficial effect of the basic scheme is that the winding rod is driven to rotate by the motor, which is conducive to better unwinding of the car protection film roll on the winding rod.

[0017] Further, the fourth conveying shaft is provided with a working assembly away from the third conveying shaft, the working assembly comprises a workbench, the workbench is fixedly connected to the upper surface of the platform, the workbench is located away from the fourth conveying shaft on the platform surface, and the bottom of the workbench is rotatably connected with a collecting shaft away from the fourth conveying shaft, one side of the collecting shaft is provided with a second motor, the second motor is fixedly connected to the bottom of the platform, and the output shaft of the second motor is coaxially fixedly connected with the collecting shaft.

[0018] The beneficial effects of the basic scheme are that the workbench is beneficial to subsequent cutting processing of the automobile protection film on the workbench, beneficial to improving the cutting accuracy of the workers, and beneficial to improving the film pasting quality of the automobile protection film.

[0019] Further, the platform is provided with a shell, the shell is fixedly connected to the peripheral surface of the platform, the shell is provided with a second opening away from the workbench, and the shell is provided with an operation window away from the lock disc.

[0020] The beneficial effects of the basic scheme are that the shell can resist part of dust, the shell is beneficial to reducing the pollution of dust to the automobile protection film during unwinding of the automobile protection film, and the operation window is beneficial to timely observation of unwinding of the automobile protection film by the workers and timely replacement after unwinding of the automobile protection film is completed.

[0021] Further, the second conveying shaft is fixedly connected with a tension information sensor, an inner side wall of the shell is fixedly connected with a controller, and an output end of the controller is signal connected with an input end of the electric telescopic rod.

[0022] The beneficial effects of the basic scheme are that the tension information sensor is beneficial to real-time collection of the tension of the automobile protection film during unwinding of the automobile protection film, the electric telescopic rod is controlled by the controller to adjust the height of the second conveying shaft and the third conveying shaft, and the tension of the automobile protection film during unwinding is adjusted.

[0023] Further, a lighting lamp is fixedly connected to the inner top wall of the shell, and the lighting lamp is located in correspondence with the workbench.

[0024] The beneficial effects of the basic scheme are that the lighting lamp can provide illumination for the workers when the workers cut the automobile protection film on the workbench, the workers are provided with good illumination, and the cutting accuracy of the workers is improved.

[0025] Further, the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft are all engraved with textures.

[0026] The beneficial effects of the basic scheme are that the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft are all textured, which is beneficial to increase the friction between the automobile protection film and the surfaces of the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft during unwinding, and is beneficial to the stability of the automobile protection film during unwinding and to prevent the automobile protection film from sliding and deviating.

[0027] Further, the first conveying shaft, the second conveying shaft and the fourth conveying shaft extend through the first protective shell, the second protective shell and the third protective shell to an outer end close to the electric telescopic rod, and the first conveying shaft, the second conveying shaft and the fourth conveying shaft are all fixedly connected with a plurality of fan blades at the outer end close to the electric telescopic rod, and the outer shell is provided with a ventilation opening at a position corresponding to the fan blades.

[0028] The beneficial effects of the basic scheme are that the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft are all textured, which is beneficial to increase the friction between the automobile protection film and the surfaces of the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft during unwinding, and is beneficial to the stability of the automobile protection film during unwinding and to prevent the automobile protection film from sliding and deviating. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is an internal axonometric view of the automobile protection film unwinding equipment capable of automatically adjusting tension in the embodiments of the present application.

[0030] Figure 2 It is a front view of the automobile protection film unwinding equipment capable of automatically adjusting tension in the embodiments of the present application.

[0031] Figure 3 It is an internal axonometric view of the automobile protection film unwinding equipment capable of automatically adjusting tension in the embodiments of the present application.

[0032] The reference signs in the drawings of the specification include: platform 1, workbench 2, collection shaft 3, third protective shell 4, third limiting plate 5, second protective shell 6, second limiting plate 7, first protective shell 8, first limiting plate 9, lock disc 10, table leg 11, support plate 12, first motor 13, unwinding rod 14, first conveying shaft 15, electric telescopic rod 16, second conveying shaft 17, third conveying shaft 18, sliding block 19, outer shell 20, illuminating lamp 21, fourth conveying shaft 22, second opening 23, operation window 24, collar 25, second motor 26, tension information sensor 27, fan blade 28. DETAILED DESCRIPTION

[0033] The following is further described in detail through specific embodiments:

[0034] Embodiment 1:

[0035] Basically as shown in the drawings Figure 1 ,Figure 2 and Figure 3 As shown in the figure: an automatic tension adjusting car protection film unwinding device, including a platform 1, the upper surface of the platform 1 is provided with an unwinding assembly, a conveying assembly and a limiting assembly; the unwinding assembly is located on one side of the top of the platform, used for unwinding the car protection film, the conveying assembly is located on the side of the top of the platform away from the unwinding assembly, and the limiting assembly is located between the unwinding assembly and the conveying assembly.

[0036] The unwinding assembly includes a support plate 12 welded with the top of the platform 1, a unwinding rod 14 rotatably connected with the support plate 12, and a lock disc 10 threadedly connected with the other end of the unwinding rod 14, the unwinding rod 14 can be sleeved with the car protection film, which is conducive to the unfolding of the car protection film.

[0037] Further comprising a power supply assembly, the power supply assembly includes a first motor 13 fixedly connected on the side of the support plate 12 away from the unwinding rod 14, the output shaft of the first motor 13 is coaxially fixedly connected with the unwinding rod 14, and the first motor 13 can provide driving force for the unwinding rod 14, which is conducive to helping the unwinding rod 14 to rotate.

[0038] The conveying assembly includes a first conveying shaft 15, a second conveying shaft 17 and a fourth conveying shaft 22 arranged in sequence from right to left, a third conveying shaft 18 arranged above the second conveying shaft 17, and a first protective shell 8, a second protective shell 6 and a third protective shell 4 arranged in sequence from right to left, the first protective shell 8, the second protective shell 6 and the third protective shell 4 are fixedly connected on the upper surface of the platform 1, the first protective shell 8, the second protective shell 6 and the third protective shell 4 are symmetrically arranged along the transverse center line of the platform 1 from right to left, the two ends of the first conveying shaft 15 and the fourth conveying shaft 22 are rotatably connected with the first protective shell 8 and the third protective shell 4 respectively, one end of the first conveying shaft 15 and the fourth conveying shaft 22 can extend to the outside of the first protective shell 8 and the third protective shell 4 through the first protective shell 8 and the third protective shell 4, a second sliding groove is formed in the second protective shell 6, an electric telescopic rod 16 is arranged in the second sliding groove, a plurality of sleeves 25 are fixedly connected on the top of the electric telescopic rod 16, and the sleeves 25 are in sliding fit with the second sliding groove. The two ends of the second conveying shaft 17 and the two ends of the third conveying shaft 18 are rotatably connected with the sleeves 25 respectively, and the electric telescopic rod 16 can drive the second conveying shaft 17 and the third conveying shaft 18 to move up and down through the sleeves 25, which is conducive to adjusting the tension of the car protection film.

[0039] The limiting assembly comprises a plurality of limiting plates, the upper surface of the platform 1 is provided with a first sliding groove corresponding to the positions of the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22, a plurality of sliding blocks 19 are slidably connected in the first sliding groove, the first limiting plate 9, the second limiting plate 7 and the third limiting plate 5 symmetrically arranged are fixedly connected to the sliding blocks 19, the second limiting plate 7 is provided with a first opening corresponding to the second sliding groove, the second conveying shaft 17 and the third conveying shaft 18 can move up and down in the second limiting plate 7, one end of the second conveying shaft 7 can extend to the outside through the second protective shell 6, the first conveying shaft 15 can pass through the first limiting plate 9, the second conveying shaft 17 and the third conveying shaft 18 can pass through the second limiting plate 7, the fourth conveying shaft 22 can pass through the third limiting plate 5, the first conveying shaft 15 and the fourth conveying shaft 22 are slidably connected to the first limiting plate 9 and the third limiting plate 5 respectively, the limiting plate can adjust the unwinding position of the automobile protection film after adjusting the position through the sliding block 19 and the sliding groove, which is beneficial to align the automobile protection film in the horizontal direction and keep the automobile protection film in a horizontal state during transmission, thereby reducing the deviation of the automobile protection film.

[0040] The fourth conveying shaft 22 is provided with a working assembly away from the third conveying shaft 18, the working assembly comprises a workbench 2, the workbench 2 is fixedly connected to the upper surface of the platform 1, the workbench 2 is located away from the fourth conveying shaft 22 on the upper surface of the platform, the bottom of the workbench 2 is rotatably connected with a collecting shaft 3, one side of the collecting shaft 3 is provided with a second motor 26, the second motor 26 is fixedly connected to the bottom of the platform 1, the output shaft of the second motor 26 is coaxially fixedly connected with the collecting shaft 3, the collecting shaft 3 can wind the automobile protection film cut by the worker, and can drive the automobile protection film to convey between the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22, which is beneficial to the unfolding of the automobile protection film, and the workbench 2 is beneficial to providing a good cutting platform for the worker.

[0041] The platform 1 is provided with an outer shell 20, the outer shell 20 is fixedly connected with the peripheral surface of the platform 1, the outer shell 20 is provided with a second opening 23 near the workbench 2, the outer shell 20 is provided with an operation window 24 near the lock disc 10, the outer shell 20 can resist dust in the air, which is beneficial to reduce the dust pollution of the automobile protection film.

[0042] The second conveying shaft 17 is fixedly connected with a tension information sensor 27, the inner wall of the outer shell 20 is fixedly connected with a controller, the output end of the controller is signal connected with the input end of the electric telescopic rod 16, the tension information sensor 27 can collect the tension information of the automobile protection film in real time, and the tension information sensor 27 and the controller cooperate with each other to automatically adjust the tension on the automobile protection film during the unfolding process of the automobile protection film.

[0043] The specific implementation process is as follows: first, the staff takes the roll of car protection film, then opens the operation window, removes the lock disc 10 by rotating, then sets the roll of car protection film on the unwinding rod 14, then takes one end of the car protection film from the bottom of the first transmission shaft 15, then passes through the middle of the second transmission shaft 17 and the third transmission shaft 18, and finally passes through the bottom of the fourth transmission shaft into the workbench 2 and winds on the collection shaft 3 through the bottom of the workbench 2, then according to the width of the car protection film, the position of the first limiting plate 9, the second limiting plate 7 and the third limiting plate 5 is adjusted through the sliding block 19, and the unwinding position of the car protection film is adjusted, which is beneficial to the alignment of the car protection film in the horizontal direction, and the transmission of the car protection film in the horizontal direction is kept in the horizontal state, thereby reducing the deviation of the car protection film.

[0044] After the position of the car protection film is limited by the first limiting plate 9, the second limiting plate 7 and the third limiting plate 5, the first motor 13 and the second motor 26 can be opened to make the unwinding rod 14 and the collection shaft 3 rotate, so that the car protection film can be smoothly unwound. The staff can set the tension parameter of the car protection film in advance through the controller according to the different materials of different car protection films. After setting a certain tension parameter, the tension sensor 27 will continuously monitor the tension on the surface of the car protection film. When the tension sensor 27 detects that the tension on the surface of the car protection film changes, the controller will adjust the height of the second transmission shaft 17 and the third transmission shaft 18 by controlling the electric telescopic rod 16, and then adjust the tension of the car protection film by tightening or loosening the car protection film, so that the tension of the car protection film always meets the preset value, thereby ensuring that the tension of the car protection film is always stable, which is beneficial to the staff to better cut the car protection film.

[0045] Embodiment 2:

[0046] The difference from the above embodiment is that the inner top wall of the shell 20 is fixedly connected with a lighting lamp 21, the position of the lighting lamp 21 corresponds to the workbench 2, and the lighting lamp 21 can provide good illumination for the staff.

[0047] The specific implementation process is as follows: when the staff cuts the car protection film on the workbench 2, if the light is too dim, it will seriously affect the staff's vision, and then affect the staff's cutting accuracy. The lighting lamp 21 fixedly connected with the inner top wall of the shell 20 at the position corresponding to the workbench 2 can well provide light illumination for the staff, and reduce the problem of cutting quality of the car protection film caused by dim light.

[0048] Embodiment 3:

[0049] The difference between the above embodiment is that the surfaces of the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22 are textured, which is conducive to increasing the friction between the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22 and the car protection film.

[0050] The specific implementation process is as follows: if the surfaces of the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22 are too smooth, the car protection film will also easily produce a certain horizontal deviation during unwinding, and the texture on the surfaces of the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22 can increase the friction between the surfaces of the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22 and the car protection film. The combination of the first limiting plate 9, the second limiting plate 7 and the third limiting plate 5 and the texture on the surfaces of the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22 can better reduce the deviation of the car protection film during unwinding, and further ensure the cutting quality of the staff.

[0051] Embodiment 4:

[0052] The difference between the above embodiment is that the first conveying shaft 15, the second conveying shaft 17 and the fourth conveying shaft 22 extend through the first protective shell 8, the second protective shell 6 and the third protective shell 4 to an end outside, which is close to the electric telescopic rod 16. The end of the first conveying shaft 15, the second conveying shaft 17 and the fourth conveying shaft 22 close to the electric telescopic rod 16 is fixedly connected with a plurality of fans 28. The shell 20 is provided with a ventilation opening corresponding to the fan 28. The design of the fan 28 and the ventilation opening is conducive to discharging heat in the automatic tension adjustment car protection film unwinding equipment to cool the equipment.

[0053] The specific implementation process is as follows: after the automatic tension adjustment car protection film unwinding equipment works for a long time, a lot of heat will be generated in the whole equipment due to the continuous rotation of the first conveying shaft 15, the second conveying shaft 17, the third conveying shaft 18 and the fourth conveying shaft 22. By fixedly connecting a plurality of fans 28 at the end of the first conveying shaft 15, the second conveying shaft 17 and the fourth conveying shaft 22 close to the electric telescopic rod 16, and providing a ventilation opening in the shell 20 corresponding to the fan 28, the heat in the equipment can be continuously discharged to the outside through the ventilation opening through the rotation of the fan 28, the rate of air flow is improved, which is conducive to reducing the temperature in the whole automatic tension adjustment car protection film unwinding equipment, and makes the operation of the automatic tension adjustment car protection film unwinding equipment more stable.

[0054] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0055] The above is only the embodiment of the present application, and the common knowledge of the specific structure and characteristics in the scheme is not described in detail, the ordinary skilled in the art knows all the ordinary technical knowledge in the technical field of the present application before the application date or the priority date, can know all the prior art in the field and has the ability to apply the conventional experimental means before the date, the ordinary skilled in the art can improve and implement the present scheme under the inspiration given by the present application combined with their own ability, some typical known structure or known method should not be an obstacle for the ordinary skilled in the art to implement the present application. It should be pointed out that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. An automatic tension-adjusting car-protection film unwinding device, characterized in that: The platform is provided with a unwinding assembly, a conveying assembly and a limiting assembly on the upper surface; the unwinding assembly is located on one side of the top of the platform and is used for unwinding the car protection film; the conveying assembly is located on the side of the top of the platform away from the unwinding assembly; the limiting assembly is located between the unwinding assembly and the conveying assembly; the conveying assembly comprises a first conveying shaft, a second conveying shaft and a fourth conveying shaft which are sequentially arranged from right to left; the upper side of the second conveying shaft is provided with a third conveying shaft; the limiting assembly comprises a plurality of limiting plates; the upper surface of the platform is provided with a first sliding groove corresponding to the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft; a plurality of sliding blocks are slidably connected in the first sliding groove; the first limiting plate, the second limiting plate and the third limiting plate which are symmetrically arranged are fixedly connected to the sliding blocks; the first conveying shaft can pass through the first limiting plate; the second conveying shaft and the third conveying shaft can pass through the second limiting plate; the fourth conveying shaft can pass through the third limiting plate; the first conveying shaft and the fourth conveying shaft are slidably connected with the first limiting plate and the third limiting plate respectively.

2. The self-adjusting tension automotive protective film unwinding apparatus of claim 1, wherein: The conveying assembly further comprises a first protective shell, a second protective shell and a third protective shell which are sequentially arranged from right to left; the first protective shell, the second protective shell and the third protective shell are fixedly connected to the upper surface of the platform; the first protective shell, the second protective shell and the third protective shell are symmetrically arranged along the transverse center line of the platform from right to left; the two ends of the first conveying shaft and the fourth conveying shaft are rotatably connected with the first protective shell and the third protective shell respectively; one end of the first conveying shaft and the fourth conveying shaft can extend to the outside of the first protective shell and the third protective shell through the first protective shell and the third protective shell; the second protective shell is internally provided with a second sliding groove; an electric telescopic rod is arranged in the second sliding groove; a plurality of sleeves are fixedly connected to the top of the electric telescopic rod; the sleeves are slidably connected with the second sliding groove; the two ends of the second conveying shaft and the two ends of the third conveying shaft are rotatably connected with the sleeves respectively; the electric telescopic rod can drive the second conveying shaft and the third conveying shaft to move up and down through the sleeves; the second limiting plate is provided with a first opening corresponding to the second sliding groove; the second conveying shaft and the third conveying shaft can move up and down in the second limiting plate; one end of the second conveying shaft can extend to the outside through the second protective shell.

3. The self-adjusting tension automotive protective film unwinding apparatus of claim 2, wherein: The unwinding assembly comprises a support plate fixedly connected to the top of the platform; a unwinding rod is rotatably connected to the support plate; the other end of the unwinding rod is threadedly connected with a lock disc.

4. The self-adjusting tension automotive protective film unwinding apparatus of claim 3, wherein: The energy supply assembly comprises a first motor; the first motor is fixedly connected to the side of the support plate away from the unwinding rod; the output shaft of the first motor is coaxially fixedly connected with the unwinding rod.

5. The self-adjusting tension automotive protective film unwinding apparatus of claim 4, wherein: The fourth conveying shaft is provided with a working assembly away from the third conveying shaft; the working assembly comprises a workbench; the workbench is fixedly connected to the upper surface of the platform; the workbench is located on the side of the platform surface away from the fourth conveying shaft; a collecting shaft is rotatably connected to the side of the workbench bottom away from the fourth conveying shaft; a second motor is arranged on one side of the collecting shaft; the second motor is fixedly connected to the bottom of the platform; the output shaft of the second motor is coaxially fixedly connected with the collecting shaft.

6. The self-tensioning car protection film unwinding device according to claim 5, wherein: The platform is provided with an outer shell; the outer shell is fixedly connected with the peripheral surface of the platform; the second opening is arranged on the side of the outer shell close to the workbench; the operating window is arranged on the side of the outer shell close to the lock disc.

7. The self-tensioning car protection film unwinding device according to claim 6, wherein: The second conveying shaft is fixedly connected with a tension information sensor, and the inner side wall of the shell is fixedly connected with a controller.

8. The self-adjusting tension automotive protection film unwinding device of claim 7, wherein: The inner top wall of the shell is fixedly connected with a lighting lamp, and the position of the lighting lamp corresponds to the workbench.

9. The self-tensioning car protection film unwinding device according to claim 8, wherein: The surfaces of the first conveying shaft, the second conveying shaft, the third conveying shaft and the fourth conveying shaft are all engraved with textures.

10. The self-tensioning car protection film unwinding device according to claim 9, wherein: The first conveying shaft, the second conveying shaft and the fourth conveying shaft extend through the first protective shell, the second protective shell and the third protective shell to one end close to the electric telescopic rod, and the one end close to the electric telescopic rod of the first conveying shaft, the second conveying shaft and the fourth conveying shaft are all fixedly connected with a plurality of fan blades, and the shell is provided with a ventilation opening at a position corresponding to the fan blades.

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