Film-overlaying device

Abstract

A film-overlaying device, comprising an upper unwinding mechanism and a lower unwinding mechanism, wherein the upper unwinding mechanism and the lower unwinding mechanism are each provided with an air expanding shaft chuck assembly, each air expanding shaft chuck assembly comprises two bases, two chucks and an air expanding shaft clamped by the two chucks, and each chuck comprises a basic shaft, a sliding sleeve and a clamping block; and a bearing housing is fixed to each base, a first end portion of each basic shaft is rotationally connected to the corresponding bearing housing via a bearing, a notch is formed in a second end portion of each basic shaft, each notch comprises an axial opening extending in an axial direction and a radial opening facing a radial direction, and each air expanding shaft can slide into the corresponding axial opening through the corresponding radial opening. A limiting pin connected to the corresponding basic shaft is provided on each clamping block, and an insertion hole allowing the corresponding limiting pin to be inserted is formed in each bearing housing. It is guaranteed that the limiting pin can be inserted into the insertion hole only when the radial opening in the basic shaft returns to face upwards, such that the clamping block and the sliding sleeve smoothly retreat to unblock the radial opening, thereby effectively avoiding the problem of film roll falling caused by misoperation during unwinding.

Description

A coating device Technical Field

[0001] The present invention relates to the technical field of thin film manufacturing, in particular to a film coating device. Background Art

[0002] Some film products such as thin films, thick films and sheets need to be coated on both surfaces to provide protection, aesthetics and other functions. The coating device generally uses a unwinding mechanism to release the protective film so that the protective film is flattened and covered on the horizontally conveyed product. The existing unwinding mechanism is mainly installed and clamped by a safety chuck. When fixing the air expansion shaft, the air expansion shaft is usually installed in the bayonet of the safety chuck, and then the air expansion shaft is clamped so that the rotation of the safety chuck drives the air expansion shaft to rotate synchronously, thereby completing the function of winding or releasing the film. The safety chuck mainly includes a base shaft and a locking block. The base shaft is provided with a bayonet for supporting and positioning the shaft end of the air expansion shaft. The locking block is used to limit the shaft end of the air expansion shaft to the base shaft, and the locking block can move along the axial direction of the base shaft.

[0003] Under normal circumstances, when removing the air expansion shaft, the bayonet on the base shaft needs to be vertically upward, and the air expansion shaft is still supported even after the locking block is retracted and unlocked; in actual application, due to the lack of work experience of the staff, there is a risk of misoperation, that is, when unloading the roll, the bayonet on the base shaft is not returned to the correct position and facing upward, the locking block is pushed and unlocked by the staff, causing the air expansion shaft to separate from the base shaft and fall, thereby causing injuries to the staff or damage to the air expansion shaft and the film roll.

[0004] In addition, under normal circumstances, when the film roll is rolled up, the bayonet on the base shaft also needs to be vertically upward. If the bayonet on the base shaft is not returned to the correct position and faces upward, the shaft end of the air inflation shaft may easily fall off the base shaft after being placed into the bayonet of the base shaft, thereby causing the air inflation shaft and the film roll to fall off the base shaft, thereby causing injuries to staff or damage to the air inflation shaft and the film roll.

[0005] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a film coating device, which aims to limit the film roll to be taken out in an upward direction, thereby avoiding the film roll from falling due to misoperation.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The lower unwinding roller is installed on the lower rear portion of the upper guide roller and the lower guide roller is installed on the lower rear portion of the lower guide roller. The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket.

[0009] As a further improvement of the above technical solution, the limiting pin is a screw, the clamping block is provided with a through hole for the screw to pass through, the base shaft is provided with a threaded hole corresponding to the through hole, and the head of the screw is pressed against the clamping block.

[0010] As a further improvement of the above technical solution, the second end of the base shaft is U-shaped; the sliding sleeve is annular and the inner ring of the sliding sleeve is provided with an embedding opening that cooperates with the clamping block, the clamping block is fixed to the sliding sleeve by screws, and the side wall of the clamping block is slidably connected to the base shaft.

[0011] As a further improvement of the above technical solution, a fixed plate is provided under each of the two bases, and a guide rail extending axially along the air-expanding shaft is provided on the fixed plate. The base is slidably connected to the guide rail through a slider, and the base is provided with a locking screw for pressing it against the fixed plate.

[0012] As a further improvement of the above technical solution, a support block for supporting the pneumatic shaft is fixed to the axial opening of the notch, and end face baffles are provided at both ends of the pneumatic shaft. The end face baffles can drive the support block to move, and one of the bases is driven by a translation drive mechanism.

[0013] As a further improvement of the above technical solution, the translation drive mechanism includes a fixed bracket, an adjusting screw rotatably connected to the bracket, and a screw nut sleeved on the adjusting screw. The adjusting screw passes through the base horizontally, the screw nut is fixed on the base, and the adjusting screw is connected to the handwheel drive.

[0014] As a further improvement of the above technical solution, the frame is provided with a first roller located upstream of the traction roller and a second roller located downstream of the traction roller, the second roller is located between the upper unwinding mechanism and the lower unwinding mechanism, the traction roller is connected to the drive motor, and the pressure roller approaches or moves away from the traction roller through a lifting mechanism.

[0015] As a further improvement of the above technical solution, the frame is provided with pedestrian platforms on the left and right sides of the upper unwinding mechanism, and the pedestrian platforms are connected to the ground via a ladder.

[0016] As a further improvement of the above technical solution, two upper unwinding mechanisms are provided, and the two upper unwinding mechanisms are arranged front to back and used alternately; two lower unwinding mechanisms are provided, and the two lower unwinding mechanisms are arranged front to back and used alternately.

[0017] As a further improvement of the above technical solution, the transverse trolley includes a profile bracket and casters arranged at the bottom of the profile bracket, and a ground rail for the guide pins and casters to travel on is provided on the ground.

[0018] The present invention provides a beneficial effect: Compared to the prior art, the film laminating device provided by the present invention innovatively improves the pneumatic shaft chuck assembly in the upper and lower unwinding mechanisms. By providing a stop pin on the clamp block and base shaft, facing the bearing seat, the stop pin can only be inserted into the insertion hole when the radial opening on the base shaft is returned to an upward orientation, allowing the clamp block and sliding sleeve to smoothly retract and release the blockage of the radial opening. If the radial opening on the base shaft is not returned to an upward orientation, the stop pin cooperates with the bearing seat, interfering with the retraction of the clamp block and sliding sleeve, restricting the film roll removal direction to only vertically upward, effectively preventing the film roll from falling due to misoperation during unloading. Furthermore, the stop pin and insertion hole prevent the base shaft from rotating. As a new film roll is being wound up, the second end of the base shaft stably supports the new film roll, preventing the base shaft from rotating and falling due to the clamp block rotating before it advances to seal the radial opening and axially restrain the pneumatic shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of a film coating device provided by the present invention.

[0020] FIG2 is a perspective view of the coating device provided by the present invention.

[0021] FIG3 is a perspective view of the pneumatic shaft chuck assembly.

[0022] FIG4 is a partial enlarged view of area A in FIG3 .

[0023] FIG5 is a schematic structural diagram of the pneumatic shaft chuck assembly.

[0024] FIG6 is a partial enlarged view of area B in FIG5 .

[0025] FIG7 is a partial enlarged view of area C in FIG5 .

[0026] FIG8 is a schematic diagram showing that the limit pin is inserted into the insertion hole and the notch on the base shaft is opened.

[0027] FIG9 is a schematic diagram of installing an end face baffle on an air expansion shaft.

[0028] Main component symbols: 1-base, 2-chuck, 21-base shaft, 22-threaded hole, 3-slot, 31-axial opening, 32-radial opening, 4-bearing seat, 41-socket, 42-bearing, 5-air shaft, 51-end face stopper, 61-sleeve, 62-support block, 63-clamping block, 631-through hole, 7-limit pin, 90-tension controller, 91-fixed plate, 92-guide rail, 93-slider, 94-locking screw, 95-translation drive mechanism, 951-bracket, 952-adjusting screw, 953-screw nut, 9 54-Handwheel, 81-Frame, 82-Traction Roller, 83-Pressing Roller, 830-Lifting Mechanism, 84-Upper Unwinding Mechanism, 85-Upper Guide Roller, 86-Upper Unwinding Roller, 87-Lower Unwinding Mechanism, 871-Transverse Trolley, 8711-Profile Support, 8712-Castor, 8713-Floor Rail, 88-Lower Guide Roller, 89-Lower Unwinding Roller, 80-Pneumatic Shaft Chuck Assembly, 821-First Idler, 822-Second Idler, 823-Drive Motor, 901-Protective Film, 902-Product, 811-Pedestrian Step, 812-Ladder. DETAILED DESCRIPTION

[0029] The present invention provides a coating device. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0030] Please refer to Figures 1-9. The present invention provides a laminating device, including a frame 81, a traction roller 82 arranged at the front of the frame 81, a pressure roller 83 arranged just below the traction roller 82, an upper unwinding mechanism 84 arranged at the upper side of the rear of the frame 81, and a lower unwinding mechanism 87 arranged at the lower side of the rear of the frame 81. The upper unwinding mechanism 84 and the lower unwinding mechanism 87 are each used to unwind a layer of protective film 901. The upper unwinding mechanism 84 includes an air filter fixed to the frame 81. The expansion shaft chuck assembly 80, the frame 81 is provided with several upper guide rollers 85 for guiding the protective film 901 to be transferred to the traction roller 82, and the upper unfolding roller 86 is arranged downstream of the upper guide roller 85; the lower unwinding mechanism 87 includes a transverse trolley 871 and an air expansion shaft chuck assembly 80 arranged on the transverse trolley 871, the frame 81 is provided with several lower guide rollers 88 for guiding the protective film 901 to be transferred to the pressure roller 83, and the lower unfolding roller 89 is arranged downstream of the lower guide roller 88.

[0031] The laminating device provided by the present invention is primarily used for laminating products 902, such as thin films, thick films, and sheets. During operation, both the upper unwinding mechanism 84 and the lower unwinding mechanism 87 are equipped with film rolls. The pressure roller 83 presses the product 902 against the traction roller 82. The product 902 is pulled from front to back by the traction roller 82. The protective film 901 released by the upper unwinding mechanism 84 is sequentially wound around the upper guide roller 85, the upper flattening roller, and the traction roller 82. The protective film 901 is pressed against the upper surface of the product 902 by the traction roller 82. The protective film 901 released by the lower unwinding mechanism 87 is sequentially wound around the lower guide roller 88, the lower flattening roller, and the pressure roller 83. The protective film 901 is pressed against the lower surface of the product 902 by the pressure roller 83, thereby achieving double-sided lamination of the product 902, providing a certain degree of protection and aesthetics for the product 902.

[0032] Specifically, the pneumatic shaft chuck assembly 80 includes two bases 1, two chucks 2 rotatably arranged on the corresponding bases 1, and a pneumatic shaft 5 clamped by the two chucks 2. The two chucks 2 are mirror-symmetrical, and each of the chucks 2 includes a base shaft 21, a sleeve 61, and a clamping block 63; a bearing seat 4 is fixed on the base 1, and the first end of the base shaft 21 is rotatably connected to the bearing seat 4 through a bearing 42, and a groove 3 is formed on the second end of the base shaft 21, and the groove 3 includes an axial opening 31 extending in the axial direction and a radial opening 32 in the radial direction. The pneumatic shaft 5 can slide into the axial opening 31 through the radial opening 32, and the outer portion of the second end of the base shaft 21 is provided with a sleeve 61 that can slide along the axial direction of the base shaft 21. A clamping block 63 is provided on the sleeve 61, and the sliding sleeve 61 and the clamping block 63 can slide together in the axial direction to block the radial opening 32 so that the clamping block 63 and the second end of the base shaft 21 can jointly clamp the air-expanding shaft 5; the clamping block 63 is provided with a limit pin 7 connected to the base shaft 21, and the limit pin 7 extends axially and faces the first end face of the bearing seat 4. The first end face of the bearing seat 4 is the end face facing the air-expanding shaft 5, and a socket 41 for inserting the limit pin 7 is provided on the first end face of the bearing seat 4. When the limit pin 7 is inserted into the socket 41, the radial opening 32 faces upward; a tension controller 90 is provided on one of the bases 1, and the tension controller 90 is transmission-connected to the corresponding base shaft 21.

[0033] It should be noted that the pneumatic shaft 5 (or inflatable shaft) is a conventional technology, such as a key-type pneumatic shaft 5 , which has a nozzle and multiple key bars. Air is injected and released by the nozzle to achieve tension and relaxation, making it easy to use. When the film roll needs to be adjusted, the position of the pneumatic shaft 5 can be adjusted by simply releasing air. After adjustment, re-injecting air to tighten the film roll allows for normal operation, which is convenient and quick.

[0034] It is understood that the pneumatic shaft 5 inflates the film roll core to form a single unit. When the protective film 901 on the film roll is pulled externally, the pneumatic shaft 5 becomes a driven unwinding shaft, causing the film roll and the pneumatic shaft 5 to rotate synchronously. The two chucks 2 clamp the ends of the pneumatic shaft 5 and rotate relative to the bearing seat 4. When the protective film 901 on the film roll is exhausted, it (along with the pneumatic shaft 5) needs to be transferred. However, the orientation of the radial opening 32 on the existing base shaft 21 is uncertain. It is important to understand that only when the radial opening 32 is facing vertically upward can the clamping block 63 safely release the restraint on the pneumatic shaft 5, allowing the second end of the base shaft 21 to continue to support the pneumatic shaft 5 and prevent it from falling. When the radial opening 32 is not facing vertically upward, even if the staff pushes the sleeve 61 and the clamping block 63 backward, the limit pin 7 on the clamping block 63 will be blocked by the front end surface of the bearing seat 4, resulting in the clamping block 63 and the sleeve 61 being unable to retreat further to eliminate the blockage of the radial opening 32, thereby preventing the staff from misoperating and causing the air-expanding shaft 5 to fall from the radial opening 32 under the action of gravity and causing a safety accident; only when the staff rotates the clamping disc 2, the radial opening 32 is returned to the vertical upward position, and the limit pin 7 is aligned with the socket 41, the staff pushes the sleeve 61 and the clamping block 63 backward, and the limit pin 7 on the clamping block 63 is inserted into the socket 41, thereby eliminating the blockage of the radial opening 32. At this time, the air-expanding shaft 5 is stably supported by the base shaft 21 before being taken out, limiting the removal direction of the film roll to only vertically upward, effectively avoiding the problem of the film roll falling due to misoperation.

[0035] Since the radial opening 32 of the base shaft 21 is in the open state, the radial opening 32 must be vertically upward, and relying on the cooperation between the limit pin 7 and the socket 41, the base shaft 21 cannot rotate at this time. Therefore, the new film roll (together with the new air-expansion shaft 5) is placed in the notch 3 of the base shaft 21. The second end of the base shaft 21 will stably support the new film roll to prevent the air-expansion shaft 5 from falling out of the notch 3 due to the rotation of the base shaft 21 before the clamping block 63 advances to seal the radial opening 32 and radially limit the air-expansion shaft 5; finally, the sliding sleeve 61 slides forward, which can drive the clamping block 63 to re-limit the air-expansion shaft 5.

[0036] Compared to the prior art, the film laminating device provided by the present invention features innovative improvements to the pneumatic shaft chuck assembly 80 in the upper unwinding mechanism 84 and the lower unwinding mechanism 87. By providing a stop pin 7 on the clamping block 63 and the base shaft 21, facing the bearing seat 4, this ensures that only when the radial opening 32 on the base shaft 21 is returned to its normal position and facing upward can the stop pin 7 be inserted into the insertion hole 41, allowing the clamping block 63 and the sliding sleeve 61 to smoothly retract and release the blockage of the radial opening 32. If the radial opening 32 on the base shaft 21 is not returned to its normal position and facing upward, the stop pin 7 will cooperate with the bearing seat 4, interfering with the retraction of the clamping block 63 and the sliding sleeve 61, thus limiting the film roll removal direction to only vertically upward, effectively preventing the film roll from falling due to misoperation during unloading. In addition, with the help of the cooperation between the limit pin 7 and the socket 41, the base shaft 21 cannot rotate on its own, so that when the new film roll is rolled up, the second end of the base shaft 21 will stably support the new film roll, preventing the clamp 63 from rotating on its own before it moves forward to seal the radial opening 32 and axially limit the air expansion shaft 5, causing the air expansion shaft 5 to fall out of the groove 3 due to the rotation of the base shaft 21.

[0037] In this embodiment, the stop pin 7 is a screw, specifically a hexagon socket screw. The clamping block 63 is provided with a through hole 631 for the screw to pass through. The base shaft 21 is provided with a threaded hole 22 corresponding to the through hole 631. The head of the screw presses against the clamping block 63. The screw and the threaded hole 22 cooperate to ensure that the clamping block 63 and the base shaft 21 remain connected. Furthermore, because the screw has a certain self-locking effect and does not rotate unless tightened, the head of the screw also prevents the clamping block 63 and the sliding sleeve 61 from separating from the base shaft 21. When a worker uses a hexagonal wrench to tighten the screw, the stop pin 7 quickly extends into or out of the socket 41.

[0038] In another embodiment, the limit pin 7 is a pin shaft structure, that is, the limit pin 7 has a smooth outer peripheral surface, and by pushing the sliding sleeve 61, the limit pin 7 on the clamping block 63 can be smoothly inserted into / exited from the socket 41, which is convenient to operate.

[0039] Specifically, the second end of the base shaft 21 is U-shaped, so the cross-sectional shape of the notch 3 is non-circular; the two ends of the pneumatic shaft 5 are square shaft structures, so the axial opening 31 is a triangular bayonet capable of positioning the end of the pneumatic shaft 5, the sleeve 61 is annular and the inner ring of the sleeve 61 is provided with an embedding opening that cooperates with the clamp 63, the clamp 63 is fixed to the sleeve 61 by screws to form a whole, and the side wall of the clamp 63 is slidably connected to the base shaft 21, that is, the inner wall surface of the base shaft 21 not only plays an axial guiding role for the sliding of the clamp 63, but also limits the rotation of the sleeve 61, so that the sleeve 61 and the clamp 63 can only move axially.

[0040] In practice, the protective film released from the film roll needs to be aligned and adjusted to ensure that the protective film 901 is accurately covered on the product 902, that is, the edge of the protective film 901 is aligned with the edge of the product 902. If the product 902 deviates in its width direction during the conveying process, the film roll needs to be aligned accordingly. The existing safety chuck mechanism is generally fixed and the safety chuck cannot be moved. Therefore, after the safety chuck mechanism clamps the air shaft 5, the air shaft 5 cannot be moved along its axial direction for fine-tuning and alignment. The air shaft 5 can only be deflated to adjust the position of the film roll on the air shaft 5 to achieve centering. This adjustment method will cause the production line to stop, affecting the actual production rhythm.

[0041] Therefore, a fixed plate 91 is provided beneath each of the two bases 1. These fixed plates 91 are equipped with guide rails 92 extending axially along the air shaft 5. The bases 1 are slidably connected to the guide rails 92 via sliders 93. Locking screws 94 are provided on the bases 1 to compress the fixed plates 91. Loosening these locking screws 94 allows the two bases 1 to move smoothly, allowing the lateral position of the air shaft 5 to be adjusted based on the actual film roll alignment. It can be understood that the fixed plate 91 of the upper unwinding mechanism 84 is fixed to the frame 81, while the fixed plate 91 of the lower unwinding mechanism 87 is fixed to the transverse carriage 871.

[0042] To ensure the two chucks 2 and the pneumatic shaft 5 form a single unit, driving one of the bases 1 to move simultaneously drives both chucks 2 and the pneumatic shaft 5 to move laterally, achieving fine-tuning of the alignment. In this embodiment, a support block 62 for supporting the pneumatic shaft 5 is fixed to the axial opening 31 of the notch 3. End stoppers 51 are provided at each end of the pneumatic shaft 5, secured to the ends of the pneumatic shaft 5 by screws. These stoppers 51 drive the support block 62 to move. One of the bases 1 is driven by a translational drive mechanism 95.

[0043] Taking Figure 3 as an example, when the film roll needs to be moved to the right to achieve centering, the translation drive mechanism 95 drives the chuck 2 on the right to move to the right, and the support block 62 on the right will pull the end face baffle 51 on the right to move to the right, and the end face baffle 51 on the left will pull the support block 62 on the left to move to the right, so that the film roll can be moved to the right for fine-tuning and centering. After the adjustment is completed, the locking screw 94 can be used to re-lock the base 1.

[0044] When the film roll needs to be moved to the left to achieve centering, the translation drive mechanism 95 drives the chuck 2 on the right to move left to fine-tune the position. At this time, the right support block 62 will move away from the right end face baffle 51. At the same time, the left chuck 2 is pulled to the left, and the left end face baffle 51 will continue to pull the air expansion shaft 5 to the left after pressing against the left support block 62 until the right end face baffle 51 is close to the right support block 62, that is, the left chuck 2 can no longer move to the left, thereby achieving left-shift fine-tuning and centering of the film roll. After the adjustment is completed, the locking screw 94 can be used to re-lock the base 1.

[0045] The above film roll adjustment methods can all be adjusted when the air shaft 5 is inflating the film roll, without stopping the machine, ensuring the normal operation of the production line.

[0046] In this embodiment, the translation drive mechanism 95 includes a fixed bracket 951, an adjustment screw 952 rotatably connected to the bracket 951, and a screw nut 953 mounted on the adjustment screw 952. The adjustment screw 952 extends transversely through the base 1, and the screw nut 953 is fixed to the base 1. When the adjustment screw 952 is driven to rotate, the screw nut 953 drives the base 1 to move laterally. A motor can be provided to drive the rotation of the adjustment screw 952, or a handwheel 954 can be provided on the adjustment screw 952 for manual adjustment, which provides simple control and convenient adjustment.

[0047] A tension controller 90 is provided on one of the bases 1 and is in transmission connection with the corresponding base shaft 21. In this embodiment, the tension controller 90 utilizes a magnetic powder brake, which uses a magnetic field to control and adjust friction, thereby stopping or decelerating the base shaft 21 and thereby regulating the tension of the unwinding protective film 901.

[0048] Specifically, the frame 81 is provided with a first idler 821 located upstream of the traction roller 82 and a second idler 822 located downstream of the traction roller 82. The second idler 822 is located between the upper unwinding mechanism 84 and the lower unwinding mechanism 87. The first idler 821 and the second idler 822 serve to horizontally support the product 902. The traction roller 82 is driven by a drive motor 823. The pressure roller 83 is moved toward or away from the traction roller 82 via a lifting mechanism 830. The lifting mechanism 830 includes side plates provided on the shafts at both ends of the pressure roller 83 and a drive cylinder for driving the side plates to rise and fall.

[0049] Due to the heavy weight of the film roll, when the upper unwinding mechanism 84 needs to be replaced, the main method is to use an overhead crane to lift the lifting shaft 5. In order to facilitate the staff to replace the roll or adjust the center of the upper unwinding mechanism 84, the frame 81 is provided with a pedestrian platform 811 on the left and right sides of the upper unwinding mechanism 84. The pedestrian platform 811 is connected to the ground by a ladder 812. The staff can climb the ladder 812 to stand on the pedestrian platform 811 and perform the film replacement operation on the upper unwinding mechanism 84.

[0050] When the film of the lower unwinding mechanism 87 needs to be replaced, the overhead crane is also used to lift the lifting shaft 5. Due to the obstruction of the frame 81 and other mechanisms, the lower unwinding mechanism 87 can only be moved out of the interior of the frame 81 by the transverse trolley 871, and the staff stands on the ground to perform the film replacement operation on the lower unwinding mechanism 87.

[0051] Specifically, there are two upper unwinding mechanisms 84, which are arranged front to back and used alternately to form a complementary but non-interfering relationship. That is, it can be understood that during normal operation, only one upper unwinding mechanism 84 is needed to unwind the protective film 901, while the new film roll of the other upper unwinding mechanism 84 is in a standby state. When the protective film 901 of one film roll is used up, a new film roll is immediately replaced to continue unwinding, reducing the film interruption time and ensuring the normal operation of production capacity. The staff only needs to replace the film on the upper unwinding mechanism 84 without the protective film 901 when the currently unrolled film roll is used up, and there is sufficient time for film replacement.

[0052] Similarly, the lower unwinding mechanism 87 is set with reference to the upper unwinding mechanism 84. There are two lower unwinding mechanisms 87. The two lower unwinding mechanisms 87 are arranged front to back and used alternately, forming a complementary but non-interfering relationship.

[0053] Preferably, the traversing trolley 871 includes a profile bracket 8711 and casters 8712 disposed at the bottom of the profile bracket 8711. Ground rails 8713 are provided on the ground for the guide pins 8712 to travel on, ensuring that the traversing trolley 871 can only move left and right. The profile bracket 8711 is structurally sound and easy to assemble. The casters 8712 are preferably braked, so that the traversing trolley 871 stops when it is in position, ensuring that the unwinding mechanism 87 is accurately positioned.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0056] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. A coating device, comprising a frame, a traction roller arranged at the front of the frame, a pressure roller arranged just below the traction roller, an upper unwinding mechanism arranged at the upper rear side of the frame, and a lower unwinding mechanism arranged at the lower rear side of the frame, wherein the upper unwinding mechanism and the lower unwinding mechanism are each used to unwind a layer of protective film, the upper unwinding mechanism comprises an air-expansion shaft chuck assembly fixed to the frame, the frame is provided with a plurality of upper guide rollers for guiding the protective film to be transmitted to the traction roller, and an upper unwinding roller arranged downstream of the upper guide roller; the lower unwinding mechanism comprises a transverse trolley and an air-expansion shaft chuck assembly arranged on the transverse trolley, the frame is provided with a plurality of lower guide rollers for guiding the protective film to be transmitted to the pressure roller, and a lower unwinding roller arranged downstream of the lower guide roller; characterized in that The air expansion shaft chuck assembly includes two bases, two chucks rotatably arranged on the corresponding bases, and an air expansion shaft clamped by the two chucks, the two chucks are mirror-symmetrical, and each chuck includes a base shaft, a sliding sleeve, and a clamping block; a bearing seat is fixed on the base, the first end of the base shaft is rotatably connected to the bearing seat through a bearing, and a notch is formed on the second end of the base shaft, and the notch includes an axial opening extending in the axial direction and a radial opening in the radial direction, the air expansion shaft can slide into the axial opening through the radial opening, and the outer sleeve of the second end of the base shaft is provided with an axially extending outer sleeve of the base shaft. A sliding sleeve, on which a clamping block is arranged, wherein the sleeve and the clamping block can slide axially together to block the radial opening so that the clamping block and the second end of the base shaft can clamp the gas-expanding shaft together; the clamping block is provided with a limit pin connected to the base shaft, the limit pin extends axially and faces the first end face of the bearing seat, the first end face of the bearing seat is the end face facing the gas-expanding shaft, and a socket for inserting the limit pin is provided on the first end face of the bearing seat, and when the limit pin is inserted into the socket, the radial opening faces upward; a tension controller is provided on one of the bases, and the tension controller is transmission-connected to the corresponding base shaft.

2. The coating device according to claim 1, characterized in that: The limiting pin is a screw, the clamping block is provided with a through hole for the screw to pass through, the base shaft is provided with a threaded hole corresponding to the through hole, and the head of the screw is pressed against the clamping block.

3. The coating device according to claim 1, characterized in that: The second end of the base shaft is U-shaped; the sliding sleeve is annular and the inner ring of the sliding sleeve is provided with an embedding opening matched with a clamping block, the clamping block is fixed to the sliding sleeve by screws, and the side wall of the clamping block is slidably connected to the base shaft.

4. The coating device according to claim 1, characterized in that: A fixing plate is provided below each of the two bases. A guide rail extending along the axial direction of the air expansion shaft is provided on the fixing plate. The base is slidably connected to the guide rail via a slider. A locking screw for pressing against the fixing plate is provided on the base.

5. The coating device according to claim 1, characterized in that: A support block for supporting the gas expansion shaft is fixed to the axial opening of the notch. Both ends of the gas expansion shaft are provided with end face baffles, which can drive the support block to move. One of the bases is driven by a translation drive mechanism.

6. The coating device according to claim 5, characterized in that: The translation drive mechanism includes a fixed bracket, an adjusting screw rod rotatably connected to the bracket, and a screw nut sleeved on the adjusting screw rod. The adjusting screw rod transversely penetrates the base, the screw nut is fixed on the base, and the adjusting screw rod is drive-connected to the hand wheel.

7. The coating device according to claim 1, characterized in that: The frame is provided with a first roller located upstream of the traction roller and a second roller located downstream of the traction roller, the second roller is located between the upper unwinding mechanism and the lower unwinding mechanism, the traction roller is connected to the driving motor, and the pressure roller approaches or moves away from the traction roller through the lifting mechanism.

8. The coating device according to claim 1, characterized in that: The frame is provided with pedestrian platforms on the left and right sides of the upper unwinding mechanism, and the pedestrian platforms are connected with the ground through a ladder.

9. The coating device according to claim 1, characterized in that: There are two upper unwinding mechanisms, which are arranged front to back and used alternately; there are two lower unwinding mechanisms, which are arranged front to back and used alternately.

10. The coating device according to claim 1, characterized in that: The transverse moving trolley comprises a profile bracket and casters arranged at the bottom of the profile bracket, and a ground rail for the guide pin casters to walk is arranged on the ground.

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