A PVB film rolling and pressing structure

Abstract

The present invention relates to the field of film production equipment, and discloses a PVB film winding and clamping structure, including a frame, on which two swing arms and a winding assembly for film winding are arranged, and pressure rollers that are movably mounted on the two swing arms and are movably fitted with the winding assembly, and the two pressure rollers are respectively located directly behind and directly above the winding assembly, and the swing arms corresponding to the pressure rollers directly above are slidably matched with the frame, and an adjustment assembly is commonly arranged between the two swing arms and the frame. The present invention can drive the pressure rollers directly above and directly behind to move accordingly through the cooperation among the winding assembly, the pressure rollers, the swing arms, and the adjustment assembly, so as to adapt to the diameter changes during the winding process, so that the film is always at the tangent point position between the pressure rollers and the winding assembly; at the same time, the operation of the overall structure utilizes the winding process of the film itself, and there is no need to add a driving part and a corresponding numerical control program to the movement of the pressure rollers, which can effectively reduce the company's production costs.

Description

Technical Field

[0001] The invention relates to the technical field of film production equipment, and in particular to a PVB film sheet rolling and pressing structure. Background Art

[0002] The film winding device generally includes a frame, on which a reel for winding the film is provided. The film is pressed tightly by a pressure roller and other structures on one side of the reel to ensure that each layer of film can be tightly wrapped on the reel. During the winding process, as more and more film is wound, the distance between the reel and the pressure roller needs to be adjusted in real time to ensure that the film can be wound normally.

[0003] For example, Chinese patent publication number CN110526013A discloses a device for removing static electricity from plastic film, which includes a static-eliminating roller arranged in parallel with the winding roller, and a driving mechanism is respectively arranged at both ends of the static-eliminating roller, and the driving mechanism includes a driving motor, a screw rod, a nut and a cylinder, the nut is arranged on the screw rod, and a slide rail for limiting the sliding of the nut is arranged in parallel on one side of the screw rod, the cylinder is arranged on the nut, the piston end of the cylinder is connected to the end of the static-eliminating roller, and one end of the screw rod is connected to the output shaft of the driving motor. It can remove static electricity and prevent deviation from winding of plastic film, improve its winding efficiency, and avoid waste of materials caused by uneven winding.

[0004] This application drives the anti-static roller to move through a cylinder, and drives the anti-static roller and the cylinder to move again through a screw rod to adapt to the continuous change of the diameter size during the winding process; however, its structure is complex and multiple drive components need to be installed on the frame. At the same time, it also requires multiple drive components to be equipped with sensor equipment and corresponding CNC programs, which greatly increases the production cost and has certain limitations in use.

[0005] Therefore, it is necessary to provide a PVB film rolling and pressing structure to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a PVB film rolling and pressing structure to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, a PVB film winding and pressing structure is designed, which can achieve effective compression during the film winding process without the need for a driving member or other structures.

[0008] Based on the above ideas, the present invention provides the following technical solutions: a PVB film winding and clamping structure, including a frame, on which are provided two swing arms and a winding assembly for film winding, and pressure rollers movably mounted on the two swing arms and movably fitted with the winding assembly, and the two pressure rollers are respectively located directly behind and directly above the winding assembly, and the swing arms corresponding to the pressure rollers directly above are slidably fitted with the frame, and an adjustment assembly is commonly provided between the two swing arms and the frame; when the winding assembly winds up the film, the pressure roller directly above can automatically rise, and the pressure roller directly behind can be driven to move backward through the swing arms and the adjustment assembly.

[0009] As a further solution of the present invention: the adjustment assembly includes a gear rotatably mounted on the frame and a connecting rod fixedly connected to the swing arm directly behind, the surfaces of the connecting rod and the swing arm directly above are fixedly mounted with first racks, and the two first racks are both connected to the gear transmission.

[0010] As a further solution of the present invention: the two first racks are staggered based on the gears. When the upper swing arm drives the corresponding first rack to rise, the other first rack and the rear swing arm can be driven to move backwards through the gears.

[0011] As a further solution of the present invention: the top surface of the frame is provided with placement holes for the swing arm, the connecting rod and the gear, the upper swing arm can slide up and down relative to the frame based on the placement holes, and the connecting rod can slide forward and backward relative to the frame based on the placement holes.

[0012] As a further solution of the present invention: the winding assembly includes a motor fixedly connected to the frame, and the output shaft of the motor is fixedly mounted with a winding roller for film winding, and the winding roller is simultaneously bonded to the pressure roller directly above and the pressure roller directly behind.

[0013] As a further solution of the present invention: the winding roller includes an axis head fixedly mounted on the motor output shaft and a reel for winding the film, and a support rod sleeved in the axis head is fixedly mounted on the end of the reel, and a locking assembly that engages with the axis head is provided on the support rod, and the locking assembly can realize synchronous rotation of the support rod and the reel.

[0014] As a further solution of the present invention: a long rod is fixedly installed on the surface of the swing arm directly above, and an arc plate corresponding to the position of the locking assembly is fixedly installed on the bottom of the long rod; when the swing arm directly above drives the long rod and the arc plate to move, the arc plate can contact the locking assembly and release the locking assembly from the shaft head.

[0015] As a further solution of the present invention: the locking assembly includes a block and two second racks that are slidably matched with the support rod, a first spring is fixedly installed between the surface of the block and the inner wall of the support rod, a gear column that is transmission-connected to the two second racks is rotatably installed inside the support rod, a pull rope fixedly connected to the block is wound on the outer surface of the gear column, semicircular rings are fixedly installed at the ends of the two second racks away from the support rod, and a second spring is fixedly installed between the semicircular rings and the outer surface of the support rod.

[0016] As a further solution of the present invention: the two second racks are symmetrically staggered based on the tooth column. When any second rack moves into the support rod, it can drive the gear to rotate and make the other second rack move into the support rod; when the tooth column rotates, the pull rope can be reeled in to make the block move into the support rod.

[0017] As a further solution of the present invention: the two semicircular rings are staggered along the axial direction of the support rod, and the two semicircular rings are designed as complete rings along the axial direction of the support rod; when the arc plate rises, it can drive the two semicircular rings to move synchronously toward the support rod.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: through the coordination among the winding assembly, the pressure roller, the swing arm and the adjustment assembly, the pressure rollers directly above and directly behind can be driven to move accordingly, and adapt to the diameter change during the winding process, so that the pressure roller can always maintain a tangent position with the film during the winding process, so that the film is always at the tangent point between the pressure roller and the winding assembly, which can make the film surface smoother after winding, and is conducive to maintaining a constant pressure of the pressure roller on the film, achieving the effects of no shaking, reducing film deviation, reducing bulging, etc. At the same time, the overall structure operation utilizes the winding process of the film itself, and there is no need to add a drive component and a corresponding CNC program to the movement of the pressure roller, which can effectively reduce the company's production costs and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a front view of the overall structure of the present invention;

[0021] Figure 2 It is a bottom view of the overall structure of the present invention;

[0022] Figure 3 for Figure 2 A magnified view of the structure at center;

[0023] Figure 4 It is a schematic diagram of the structure of the swing arm, the connecting rod and the first rack of the present invention;

[0024] Figure 5 It is a schematic diagram of the shaft head and the reel structure of the present invention;

[0025] Figure 6 It is a schematic diagram of the long rod and arc plate structure of the present invention;

[0026] Figure 7 It is a schematic diagram of the internal structure of the support rod of the present invention;

[0027] Figure 8 for Figure 7 A magnified view of the structure at B in the middle;

[0028] Fig. 9 It is a schematic diagram of the support rod and the shaft head structure of the present invention;

[0029] Fig.10 It is a schematic diagram of the slideway and shaft head structure of the present invention.

[0030] In the figure: 1, frame; 2, winding assembly; 3, pressure roller; 4, swing arm; 5, adjustment assembly; 6, locking assembly; 101, placement hole; 201, motor; 202, winding roller; 2021, reel; 2022, shaft head; 2023, support rod; 2024, cavity; 2025, slot; 2026, slide; 401, long rod; 402, arc plate; 501, gear; 502, connecting rod; 503, first rack; 601, semicircular ring; 602, block; 603, gear column; 604, second rack; 605, pull rope; 606, first spring. DETAILED DESCRIPTION

[0031] Example 1: Please refer to Figures 1 to 4 The embodiment of the present invention provides a PVB film winding and pressing structure, which is mainly used to provide a constant pressure for the film on the basis of reducing costs. The structure includes a frame 1, on which a winding assembly 2 and two swing arms 4 for winding the film are arranged. The two swing arms 4 are movably mounted with a pressure roller 3 that is movably fitted with the winding assembly 2. The pressure roller 3 can be made of existing rubber material, which can achieve effective compression of the film by the pressure roller 3. In the prior art, the pressure roller 3 is mostly driven by a cylinder, and the cylinder can drive the pressure roller 3 to move to maintain the compression state of the film. As the film is rolled, the prior art adopts the method of moving the pressure roller 3 or the winding assembly 2 to continue to maintain the compression state of the film.

[0032] In this embodiment, the two pressure rollers 3 are respectively located directly behind and directly above the winding assembly 2, and an adjustment assembly 5 is provided between the two swing arms 4 and the frame 1. The swing arm 4 is designed in a U shape as a whole, and after the positions of the two pressure rollers 3 are set, the swing arm 4 is correspondingly located directly behind and directly above the winding assembly 2. Among them, the swing arm 4 directly above and the frame 1 are slidably matched up and down, and are arranged in a vertical state as a whole; while the swing arm 4 directly behind is arranged horizontally, and the swing arm 4 directly behind is positioned correspondingly through the adjustment assembly 5.

[0033] When the winding component 2 is winding the film, the two pressure rollers 3 can always fit with the film, and the pressure roller 3 directly above will automatically rise as the film winding diameter increases. When the pressure roller 3 directly above rises, the adjustment component 5 can drive the pressure roller 3 directly behind to retreat synchronously, so that the pressure roller 3 directly behind can also keep in close fit with the increase in the film winding diameter. In the entire film winding process, the pressure roller 3 can always maintain a tangent position with the film. At this time, the film is always at the tangent point between the pressure roller 3 and the winding component 2, which can make the surface of the film smoother after winding.

[0034] Reference Figure 3 and Figure 4 In this embodiment, preferably: the adjusting component 5 includes a gear 501 rotatably mounted on the frame 1 and a connecting rod 502 fixedly connected to the rear swing arm 4, the surfaces of the connecting rod 502 and the upper swing arm 4 are fixedly mounted with a first rack 503, and the two first racks 503 are transmission connected to the gear 501, and the two first racks 503 are arranged to be staggered left and right based on the gear 501, when the upper swing arm 4 drives the corresponding first rack 503 to rise, the first rack 503 can drive the gear 501 to rotate, and the gear 501 can drive the other first rack 503 to move backward, thereby driving the rear swing arm 4 and the pressure roller 3 to move backward.

[0035] Further, such as Figure 2 As shown, the top surface of the frame 1 is provided with a placement hole 101 for the swing arm 4 above to slide up and down, and the gear 501 is also rotatably installed in the placement hole 101, while the connecting rod 502 is slidably installed in the placement hole 101 forward and backward.

[0036] Reference Figure 1 and Figure 2 In this embodiment, preferably: the winding assembly 2 includes a motor 201 fixedly connected to the frame 1, and the output shaft of the motor 201 is fixedly installed with a winding roller 202 for winding the film. The winding roller 202 is simultaneously in contact with the pressure rollers 3 directly above and directly behind. When the film is wound on the winding roller 202, the diameter size can change, thereby causing the pressure roller 3 directly above to rise.

[0037] When in use, the motor 201 is started to drive the winding roller 202 to rotate so that the film is wound. As the film is wound, the diameter size changes, which can drive the upper pressure roller 3, the upper swing arm 4 and the corresponding first rack 503 to rise. When the first rack 503 rises, it drives the other first rack 503 to move backward through the gear 501. The other first rack 503 drives the rear swing arm 4 and the rear pressure roller 3 to move backward synchronously through the connecting rod 502, so as to adapt to the diameter change when the film is wound. During the above process, the two pressure rollers 3 can continuously maintain a tangent position with the film.

[0038] In summary, through the coordination of the pressure roller 3, the swing arm 4, the first rack 503 and the gear 501, the pressure rollers 3 directly above and directly behind can be driven to move accordingly to form an adaptation. During the film winding process, the pressure roller 3 can always maintain a tangent position with the film, so that the film is always at the tangent point between the pressure roller 3 and the winding roller 202, which can make the film surface smoother after winding, and is conducive to maintaining the constant pressure of the pressure roller 3 on the film, achieving the effects of no shaking, reducing film deviation, reducing bulging, etc. At the same time, the overall structure operation utilizes the film's own winding process, and there is no need to add a drive component and a corresponding CNC program to the movement of the pressure roller 3, which can effectively reduce the company's production costs and is more practical.

[0039] Example 2: Please refer to Figures 1 to 8 On the basis of Example 1, considering that the thickness of the film on the winding roller 202 cannot be well measured during the winding process, the stop time of the winding process cannot be well controlled, and the winding size on the winding roller 202 cannot be guaranteed to be consistent, which affects the subsequent processing and factory use of the film.

[0040] To this end, the winding roller 202 is improved: at this time, the winding roller 202 includes an axis head 2022 fixedly installed on the output shaft of the motor 201 and a reel 2021 for winding the film, and a support rod 2023 sleeved in the axis head 2022 is fixedly installed on the end of the reel 2021, and a locking assembly 6 is provided on the support rod 2023 for locking with the axis head 2022. When the locking assembly 6 is locked with the axis head 2022, if the motor 201 drives the axis head 2022 to rotate, the axis head 2022 can drive the support rod 2023 and the reel 2021 to rotate synchronously through the locking assembly 6.

[0041] In order to realize the disassembly and assembly of the clamping assembly 6 and the shaft head 2022, a long rod 401 is fixedly installed on the surface of the upper swing arm 4, and an arc plate 402 corresponding to the position of the clamping assembly 6 is fixedly installed at the bottom of the long rod 401; wherein the arc plate 402 corresponds to the clamping assembly 6 in the upper and lower directions. When the upper swing arm 4 drives the long rod 401 and the arc plate 402 to move, the arc plate 402 moves from bottom to top toward the clamping assembly 6. When the thickness on the reel 2021 reaches the size requirement, the arc plate 402 contacts the clamping assembly 6 and releases the contact between the clamping assembly 6 and the shaft head 2022. At this time, the rotation of the shaft head 2022 can no longer drive the support rod 2023 to rotate, so that the reel 2021 can no longer drive the film to be rolled up.

[0042] Reference Figures 5 to 8In this embodiment, preferably: the locking assembly 6 includes a block 602 and two second racks 604 that are slidably matched with the support rod 2023, and a first spring 606 is fixedly installed between the end of the block 602 close to the support rod 2023 and the inner wall of the support rod 2023, and under the action of the first spring 606, the block 602 has a tendency to extend outward from the support rod 2023; when the block 602 extends from the support rod 2023, it can form a locking pattern with the shaft head 2022 and achieve a synchronous rotation effect, and correspondingly, a slot 2025 that is adapted to the block 602 is opened inside the shaft head 2022.

[0043] The support rod 2023 is internally rotatably provided with a tooth column 603 which is transmission-connected to the two second racks 604. The outer surface of the tooth column 603 is wound with a pull rope 605 which is fixedly connected to the clamping block 602. When the tooth column 603 rotates, the pull rope 605 can be rolled up so that the clamping block 602 is pulled into the support rod 2023. The two second racks 604 are symmetrically staggered based on the tooth column 603. When any one of the second racks 604 moves into the support rod 2023, it can drive the gear 501 to rotate and drive the other second rack 604 to move into the support rod 2023.

[0044] In the above structure, the ends of the two second racks 604 away from the support rod 2023 are fixedly mounted with semicircular rings 601, and the two semicircular rings 601 are staggered left and right, so that when any second rack 604 is retracted into the support rod 2023, the two semicircular rings 601 will be relatively close and will not interfere with each other. The two semicircular rings 601 are arranged in correspondence with the arc plate 402 up and down, and when the arc plate 402 rises, it can contact the semicircular rings 601. Correspondingly, the arc plate 402 needs to have a certain thickness dimension along the left and right directions; at the same time, the two semicircular rings 601 can form a complete circular ring state when viewed from the left and right directions, so that when the arc plate 402 rises when the reel 2021 rotates, the contact time between the arc plate 402 and any semicircular ring 601 is the same.

[0045] In order to achieve the resetting and initial positioning of the second rack 604 and the semicircular ring 601, a second spring (not shown in the figure) is fixedly installed between the semicircular ring 601 and the outer surface of the support rod 2023, and the second spring enables the second rack 604 and the semicircular ring 601 to move away from the support rod 2023.

[0046] Reference Figure 7 A cavity 2024 is provided inside the support rod 2023 for the sliding of the second rack 604 and the block 602 , and for the installation of the gear column 603 and the first spring 606 , and the pull rope 605 is also installed in the cavity 2024 .

[0047] In this embodiment, the shaft head 2022 and the support rod 2023 are arranged symmetrically on the left and right to stably support the reel 2021. However, the locking assembly 6 and the card slot 2025 only need to be installed on one side, and the shaft head 2022 on the other side only needs to be rotatably installed on the frame 1. When the shaft head 2022 on one side drives the reel 2021 to rotate, it can drive the support rod 2023 on the other side to rotate synchronously.

[0048] Furthermore, in order to facilitate the subsequent replacement of the reel 2021 , the long rod 401 is disposed at the rear side of the reel 2021 . At this time, the reel 2021 can be quickly taken in and out from the front of the frame 1 without interfering with the long rod 401 .

[0049] When in use, the pressure roller 3, swing arm 4, first rack 503 and gear 501 and other structures can drive the pressure rollers 3 directly above and directly behind to move accordingly to form an adaptation. During the film winding process, the pressure roller 3 can always maintain a tangent position with the film. The working process and effect of this part are the same as those in the first embodiment, and will not be repeated here. The difference is that when the film is wound so that the diameter size changes, the pressure roller 3 directly above will drive the swing arm 4 directly above to rise. On the one hand, the swing arm 4 directly above drives the corresponding first rack 503 to move so that the gear 501 rotates, and on the other hand, the arc plate 402 is driven to rise vertically close to the semicircular ring 601 through the long rod 401. When the winding thickness reaches the requirement, the arc plate 402 will contact one of the semicircular rings 601, and make the semicircular ring 601 and the corresponding second rack 604 shrink into the support rod 2023, and the second rack 604 can drive the tooth column 603 to rotate; on the one hand, the tooth column 603 drives the other second rack 604 and the semicircular ring 601 to move toward the support rod 2023, and on the other hand, the winding rope 605 makes the clamping block 602 shrink into the support rod 2023, at this time, the clamping block 602 is separated from the clamping groove 2025 of the shaft head 2022, so that the support rod 2023 and the shaft head 2022 are released from the synchronous rotation state.

[0050] Compared with the first embodiment, through the coordination of the support rod 2023, the shaft head 2022, the semicircular ring 601 and the arc plate 402, when the winding thickness reaches the requirement, the synchronous rotation state of the support rod 2023 and the shaft head 2022 can be automatically released, and then the winding state of the reel 2021 can be stopped, which can automatically ensure that the winding size of each reel 2021 is consistent, which is convenient for the subsequent processing and factory use of the film. The overall design is combined with the movement of the swing arm 4, so that the movement of the swing arm 4 can achieve the purpose of multi-function, and at the same time, there is no need to install the corresponding drive parts and CNC programs for the stop timing of the winding, which can further reduce the company's production costs and has stronger applicability.

[0051] Example 3: Please refer to Figures 1 to 10On the basis of the second embodiment, considering that the support rod 2023 is movably sleeved in the shaft head 2022, in order to realize the rapid disassembly and assembly of the reel 2021 after winding, it is necessary to disassemble the shaft head 2022 based on the frame 1 or disassemble the support rod 2023 based on the reel 2021. Both methods will affect the progress of the winding work and reduce the overall work efficiency.

[0052] Therefore, the shaft head 2022 is improved: the shaft head 2022 on the left side can be designed as a semi-open type and can be used for the rotation of the left support rod 2023, and the whole shaft head 2022 is semi-cylindrical. When the shaft head 2022 on the right side drives the right support rod 2023 to rotate, the reel 2021 rotates and drives the left support rod 2023 to rotate, so that the left support rod 2023 rotates based on the semi-cylindrical shaft head 2022 on the left side.

[0053] Furthermore, a spacing is left between the left support rod 2023 and the left shaft head 2022 near the surface of the frame 1. This spacing allows the reel 2021 to be placed corresponding to the left shaft head 2022 during installation so that the left support rod 2023 and the left shaft head 2022 are abutted against each other, and then the reel 2021 is moved horizontally to the right so that the right support rod 2023 slides into the right shaft head 2022, and finally the block 602 is engaged in the slot 2025, thereby achieving the synchronous rotation state of the right support rod 2023 and the right shaft head 2022.

[0054] Considering that the left side support rod 2023 rotates along the left side shaft head 2022, the left side support rod 2023 and the left side shaft head 2022 will continuously rotate. In order to reduce the wear between the left side support rod 2023 and the left side shaft head 2022, a slide groove 2026 can be provided on the left side shaft head 2022. The slide groove 2026 is adapted to the width of the slot 2025 and is longer than the slot 2025. A protrusion (not shown in the figure) is fixedly installed on the left side support rod 2023. When the left side support rod 2023 is placed, the protrusion can be smoothly inserted into the slide groove 2026. Then, when the reel 2021 is moved to the right, the protrusion can move to the right along the slide groove 2026. When the reel 2021 drives the left side support rod 2023 to rotate, the left side support rod 2023 will drive the left side shaft head 2022 to rotate synchronously through the protrusion and the slide groove 2026.

[0055] When in use, the pressure rollers 3 directly above and directly behind can be driven to move correspondingly to form an adaptation through the swing arm 4, the first rack 503 and the gear 501 and other structures. During the film winding process, the pressure roller 3 can always maintain a tangential position with the film. Through the support rod 2023, the shaft head 2022, the semicircular ring 601 and the arc plate 402 and other structures, when the winding thickness reaches the requirement, the synchronous rotation state of the support rod 2023 and the shaft head 2022 can be automatically released, and then the winding state of the reel 2021 can be stopped; the working process and effect of this part are the same as those in the second embodiment, and will not be repeated here. The difference is that when the clamping block 602 shrinks into the support rod 2023 and separates from the clamping slot 2025, the reel 2021 stops winding. At this time, the left translation of the reel 2021 can separate the right support rod 2023 from the right shaft head 2022, and the reel 2021 after winding can be quickly removed from the frame 1. Subsequently, the reel 2021 is placed so that the left support rod 2023 is against the left shaft head 2022, and then the reel 2021 is translated to the right so that the right support rod 2023 is inserted into the right shaft head 2022, so that the block 602 can be inserted into the slot 2025 to form a synchronous rotation state (in order to facilitate the entry of the block 602, the surface of the block 602 away from the reel 2021 can be set to an arc surface).

[0056] Compared with the second embodiment, through the coordination of the shaft head 2022, the support rod 2023, the slide groove 2026 and the protrusion, the reel 2021 can be quickly disassembled and assembled based on the frame 1 by translating the reel 2021 left and right based on the semi-open shaft head 2022, which can effectively improve the replacement speed of the reel 2021, ensure the overall work efficiency, and relatively reduce the labor burden of the staff. The overall design is combined with the setting of the shaft head 2022 and the support rod 2023, which can also ensure the service life of the shaft head 2022 and the support rod 2023. At the same time, because the pressure roller 3 is tangent from the top and the rear, the film quality can be guaranteed to be reliable when the reel 2021 is disassembled and rolled, which meets more requirements in actual use.

Claims

1. A PVB film rolling and pressing structure, comprising a frame, characterized in that: The frame is provided with two swing arms and a winding assembly for winding the film, and pressure rollers that are movably mounted on the two swing arms and are movably fitted with the winding assembly, and the two pressure rollers are respectively located directly behind and directly above the winding assembly, and the swing arms corresponding to the pressure rollers directly above are slidably matched with the frame, and an adjustment assembly is commonly provided between the two swing arms and the frame; when the winding assembly winds up the film, the pressure roller directly above can automatically rise, and the pressure roller directly behind can be driven to move backwards through the swing arms and the adjustment assembly; The adjustment assembly includes a gear rotatably mounted on the frame and a connecting rod fixedly connected to the swing arm directly behind, first racks are fixedly mounted on the surfaces of the connecting rod and the swing arm directly above, and the two first racks are both transmission-connected to the gear; The winding assembly includes a motor fixedly connected to the frame, and a winding roller for film winding is fixedly installed on the output shaft of the motor, and the winding roller is simultaneously attached to the pressure roller directly above and the pressure roller directly behind; The winding roller comprises a shaft head fixedly mounted on the motor output shaft and a reel for film winding, a support rod sleeved in the shaft head is fixedly mounted on the end of the reel, a clamping assembly clamped with the shaft head is arranged on the support rod, and the support rod and the reel can be rotated synchronously through the clamping assembly; A long rod is fixedly installed on the surface of the swing arm directly above, and an arc plate corresponding to the position of the clamping assembly is fixedly installed on the bottom of the long rod; when the swing arm directly above drives the long rod and the arc plate to move, the arc plate can contact the clamping assembly and release the clamping assembly from the shaft head; The engaging assembly includes a block and two second racks that are slidably matched with the support rod, a first spring is fixedly installed between the surface of the block and the inner wall of the support rod, a gear column that is transmission-connected to the two second racks is rotatably installed inside the support rod, a pull rope fixedly connected to the block is wound on the outer surface of the gear column, semicircular rings are fixedly installed on the ends of the two second racks away from the support rod, and a second spring is fixedly installed between the semicircular rings and the outer surface of the support rod.

2. The PVB film rolling and pressing structure according to claim 1 is characterized in that: The two first racks are staggered based on the gears. When the upper swing arm drives the corresponding first rack to rise, the other first rack and the rear swing arm can be driven to move backwards through the gears.

3. The PVB film rolling and pressing structure according to claim 1 is characterized in that: The top surface of the frame is provided with holes for arranging the swing arm, the connecting rod and the gear. The swing arm directly above can slide up and down relative to the frame based on the arranging holes, and the connecting rod can slide forward and backward relative to the frame based on the arranging holes.

4. The PVB film rolling and pressing structure according to claim 1, characterized in that: The two second racks are symmetrically staggered based on the tooth column. When any second rack moves into the support rod, it can drive the gear to rotate and make the other second rack move into the support rod; when the tooth column rotates, the pull rope can be reeled in to make the block move into the support rod.

5. The PVB film rolling and pressing structure according to claim 1, characterized in that: The two semicircular rings are staggered along the axial direction of the support rod, and the two semicircular rings are designed as complete circular rings along the axial direction of the support rod; when the arc plate rises, the two semicircular rings can be driven to move synchronously toward the support rod.

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