Composite device for flame-retardant PVC film and method of use

Abstract

The application discloses a kind of composite device and use method of flame-retardant PVC film, it is related to PVC film processing field, including a set of fixed shell and conveying belt mechanism, conveying belt mechanism is located in the inside of fixed shell, and it is controlled to run by motor of fixed shell outer wall, the top of the fixed shell is equipped with pressing mechanism and winding mechanism, the winding mechanism includes mounting seat, rotating column, winding roller and lifting buckle mechanism, a set of mounting seat is movably installed on the outer wall of fixed shell.The film on film roller is fixed to fixed clamping block by the application, the film is pulled forward by fixed clamping block, when fixed clamping block passes through pressing mechanism, corresponding pressing work can be carried out, the waste length of film is reduced, and production cost is reduced, and fixed clamping block is connected with winding mechanism by magnetic attraction, so that automatic adsorption is carried out after reaching winding mechanism, which is convenient and fast.

Description

Technical Field

[0001] This invention relates to the field of PVC film, specifically to a composite device and method for using flame-retardant PVC film. Background Technology

[0002] PVC film, whose main component is polyvinyl chloride, has other components added to enhance its heat resistance, toughness, and ductility. The top layer of this surface film is paint, the middle layer is mainly polyvinyl chloride, and the bottom layer is a backing adhesive. It is a popular and widely used synthetic material in the world today. The global usage of PVC film ranks second among various synthetic materials. Among the materials that can produce three-dimensional surface films, PVC is the most suitable.

[0003] The function of flame-retardant PVC composite film is to laminate multiple layers of film together, overcoming the shortcomings of single-layer film and combining the advantages of each layer to become a relatively ideal packaging material with a certain flame-retardant effect. The lamination process mainly includes dry lamination and wet lamination. Dry lamination involves coating a layer of solvent-based adhesive onto the plastic film using a coating device, removing the solvent and drying it using a laminating machine, and then laminating it with other substrates under hot pressing. Wet lamination involves coating a layer of adhesive onto the surface of the composite substrate, and then laminating it with other materials using pressure rollers while the adhesive is still wet to form a composite film.

[0004] The aforementioned wet lamination process uses adhesives and pressure rollers to bond the substrate and the film. In actual production, one end of the film needs to be connected to a rotating roller on the take-up rack. When the roller rotates, it will drive the film to be wound up. Then the lamination mechanism will start to bond other substrates with the film. However, in this case, some film will be wound up by the roller without being laminated, which will result in waste and increase production costs. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a laminating device and method for flame-retardant PVC film to solve the technical problem that some films are rolled up by the rollers without laminating, which would cause waste.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a composite device for flame-retardant PVC film, comprising a set of fixed shells and a conveyor belt mechanism. The conveyor belt mechanism is located inside the fixed shell and is controlled by a motor on the outer wall of the fixed shell. A pressing mechanism and a winding mechanism are installed on the top of the fixed shell. The winding mechanism includes a mounting base, a rotating column, a winding roller, and a lifting buckle mechanism. A set of mounting bases is movably installed on the outer wall of the fixed shell. A mounting block is fixedly installed on the outer wall of the mounting base. A lifting buckle mechanism is installed between the inner wall of the mounting block and the mounting base. A rotating column is rotatably connected to the top of the lifting buckle mechanism. A winding roller is installed on the surface of the rotating column. A traction mechanism is installed on the surface of the conveyor belt mechanism. The traction mechanism includes a traction block, a fixed clamping block, and a magnetic suction component. The magnetic suction component is installed on the surface of the traction block. The traction block is magnetically connected to the conveyor belt mechanism and the winding roller through the magnetic suction component. A fixed clamping block is installed on one side of the traction block.

[0007] By adopting the above technical solution, the corresponding pressing work can be carried out after the fixed card block passes through the pressing mechanism, which reduces the wasted length of the film.

[0008] The invention is further configured such that a set of mounting plates is fixedly disposed on the top of the fixed shell, and the pressing mechanism is installed on the inner side of the mounting plates. The pressing mechanism includes a film roller, a leveling roller, a glue-applying roller, a smoothing roller, a substrate roller, a pressure roller, and a guide roller, all of which are rotatably disposed on the inner side wall of the mounting plate from left to right. The bottoms of the leveling roller, the glue-applying roller, the smoothing roller, the pressure roller, and the guide roller are located on the same horizontal plane below the inner side wall of the mounting plate. The installation height of the substrate roller is located above the inner side wall of the mounting plate, and the installation height of the film roller is located between the substrate roller and the leveling roller.

[0009] By adopting the above technical solution, the film and the substrate are laminated together.

[0010] The present invention is further configured such that the pressing mechanism includes a limiting plate and a scraper shell, a set of the limiting plates are fixedly installed on the inner side wall of the mounting plate, and the limiting plates are located on both sides of the coating roller, one end of one limiting plate is attached to the outer wall of the coating roller, and one end of the other limiting plate has a gap with the coating roller, and a scraper shell is provided on one side of the spreading roller.

[0011] By adopting the above technical solution, the coating roller can coat the passing film with glue, and the excess glue on the coating roller can be scraped off by the glue scraper.

[0012] The present invention is further configured such that the winding mechanism includes a mounting groove and a magnetic attraction groove, the outer wall of the winding roller is provided with a mounting groove, and the inner wall of the mounting groove is provided with a plurality of magnetic attraction grooves.

[0013] By adopting the above technical solution, the mounting slot facilitates the insertion of the fixing block.

[0014] The present invention is further configured such that the magnetic attraction component includes magnetic attraction plates and magnetic attraction columns, a plurality of magnetic attraction plates are fixedly disposed at the bottom of the traction block, and the traction block is attracted to the metal sheet on the surface of the conveyor belt mechanism through the magnetic attraction plates, the magnetic attraction columns are fixedly installed on one side of the traction block, and the traction block is attracted to the magnetic attraction groove through the magnetic attraction columns and inserted into the installation groove.

[0015] By adopting the above technical solution, the magnetic suction component facilitates the fixing of the fixing block to the conveyor belt mechanism and the winding roller.

[0016] The present invention is further configured such that the lifting buckle mechanism includes a limiting mechanism and an ejection spring, the bottom of the mounting base is equipped with an ejection spring, and the limiting mechanism controls the mounting base to pop out from the mounting block.

[0017] By adopting the above technical solution, the limiting mechanism fixes the mounting base.

[0018] The present invention is further configured such that the limiting mechanism includes a fixed block, an insert block, a limiting block, a return spring, an elastic sheet, and a groove. The fixed block is slidably disposed on the surface of the mounting base. Insert blocks are fixedly disposed at both ends of the fixed block. A limiting block is movably disposed on the inner wall of the mounting block. A return spring is disposed between the limiting block and the mounting block. A slot for the limiting block to be inserted is provided on the surface of the mounting base. Multiple elastic sheets are disposed on the contact surface between the fixed block and the mounting base. A groove is provided on the surface of the mounting base.

[0019] By adopting the above technical solution, after the fixing block is fixed, the mounting base will pop out from the mounting block.

[0020] The present invention is further configured such that a support mechanism is provided inside the conveyor belt mechanism, the support mechanism including a conveyor belt, top blocks, a gear set, and a chain drive mechanism. The conveyor belt is installed inside the conveyor belt mechanism, and a chain drive mechanism is installed at one end of the rotating shaft of the conveyor belt mechanism. A gear set is provided on the inner wall of the chain drive mechanism, and the gear set meshes with the rotating roller of the conveyor belt. The conveyor belt mechanism drives the conveyor belt to rotate. A plurality of top blocks are provided on the surface of the conveyor belt, and the top surface of the top blocks is in contact with the back of the conveyor belt of the conveyor belt mechanism.

[0021] By adopting the above technical solution, the support mechanism facilitates the lifting of the conveyor belt of the conveyor belt mechanism, so that the film and the roller can make full contact.

[0022] The invention is further configured such that a telescopic rod is installed on the top of the fixed shell, and the output end of the telescopic rod is connected to the outer wall of the mounting plate.

[0023] By adopting the above technical solution, the telescopic rod controls the raising and lowering of the mounting plate.

[0024] This invention also provides the following technical solution: a method for using a flame-retardant PVC film composite device, the specific operation steps of which are as follows:

[0025] Step 1: Pull one end of the film on the film roller down and fix it to the fixing block. Then start the conveyor belt mechanism. The conveyor belt mechanism drives the fixing block to pull the film forward.

[0026] Step 2: After the fixing block passes the pressing mechanism, the telescopic rod pulls the mounting plate down, and the pressing mechanism begins to press.

[0027] Step 3: When the fixing block reaches the position of the winding mechanism, the magnetic pin on the fixing block is inserted into the magnetic slot under the action of magnetic force for fixing;

[0028] Step 4: After the fixing block is fixed, the winding roller rotates, the lifting buckle mechanism unlocks, and the mounting seat pops out under the action of the reset spring, starting the subsequent winding work.

[0029] In summary, the present invention has the following advantages: By fixing one end of the film on the film roller to the fixed block, the fixed block pulls the film forward. When the fixed block passes the pressing mechanism, the corresponding pressing work can be performed, which reduces the wasted length of the film and lowers the production cost. The fixed block is connected to the winding mechanism by magnetic attraction, so it is automatically attracted after reaching the winding mechanism, which is convenient and fast. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the winding mechanism of the present invention in the raised state;

[0031] Figure 2 This is a schematic diagram of the internal structure of the conveyor belt mechanism of the present invention;

[0032] Figure 3 This is a schematic diagram of the pressing mechanism of the present invention;

[0033] Figure 4 This is a schematic diagram of the traction mechanism of the present invention;

[0034] Figure 5 This is a schematic diagram of the winding mechanism of the present invention;

[0035] Figure 6 This is a schematic diagram of the internal structure of the mounting block of the present invention;

[0036] Figure 7 This is a schematic diagram of the mounting base of the present invention;

[0037] Figure 8 For the present invention Figure 6 Enlarged view of the structure at point A;

[0038] Figure 9 For the present invention Figure 7 Enlarged view of the structure at point B.

[0039] In the diagram: 1. Fixed housing; 2. Conveyor belt mechanism; 3. Pressing mechanism; 31. Film roller; 32. Limiting plate; 33. Leveling roller; 34. Glue-applying roller; 35. Glue scraper shell; 36. Spreading roller; 37. Pressure roller; 38. Guide roller; 39. Substrate roller; 4. Traction mechanism; 41. Traction block; 42. Magnetic suction plate; 43. Magnetic suction column; 44. Fixing block; 5. Rewinding mechanism; 51. Mounting base; 52. Rotating column; 5 3. Rewinding roller; 54. Mounting groove; 55. Magnetic suction groove; 56. Limiting mechanism; 561. Fixing block; 562. Insertion block; 563. Limiting block; 564. Return spring; 565. Elastic sheet; 566. Groove; 57. Ejection spring; 6. Mounting block; 7. Support mechanism; 71. Conveyor belt; 72. Top block; 73. Gear set; 74. Chain drive mechanism; 8. Motor; 9. Telescopic rod; 10. Mounting plate. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0041] All items mentioned in this invention can be obtained through market or private order.

[0042] A flame-retardant PVC film composite device and its usage method, such as Figure 1-9 As shown, it includes a fixed housing 1, and a conveyor belt mechanism 2 is installed inside the fixed housing 1. The operation of the conveyor belt mechanism 2 is controlled by a motor 8 on the outer wall of the fixed housing 1. The conveyor belt mechanism 2 is used to control the forward movement of the traction mechanism 4 and provide power for the traction mechanism 4 to pull the film on the film roller 31 forward.

[0043] A set of mounting plates 10 is fixedly installed on the top of the fixed shell 1. The pressing mechanism 3 is installed on the inner side of the mounting plate 10. The pressing mechanism 3 includes a film roller 31, a leveling roller 33, a glue-applying roller 34, a smoothing roller 36, a substrate roller 39, a pressure roller 37, and a guide roller 38, all of which are rotatably arranged on the inner wall of the mounting plate 10 from left to right. The bottoms of the leveling roller 33, the glue-applying roller 34, the smoothing roller 36, the pressure roller 37, and the guide roller 38 are located on the same horizontal plane below the inner wall of the mounting plate 10. The installation height of the substrate roller 39 is above the inner wall of the mounting plate 10. The film roller 31, the leveling roller 33, the glue-applying roller 34, the smoothing roller 36, the pressure roller 37, and the guide roller 38 are all located on the same horizontal plane below the inner wall of the mounting plate 10. The installation height of 1 is located between the substrate roller 39 and the leveling roller 33. The film roller 31 is used to provide the film. The leveling roller 33 flattens the pulled film to prevent surface wrinkles from causing a decrease in subsequent pressing quality. The glue-applying roller 34 can spread glue onto the film surface, and the spreading roller 36 spreads the glue evenly on the film surface, further improving the pressing quality of the substrate and film on the substrate roller 39. After the substrate comes into contact with the glue on the film surface, it is bonded to the film. Then, the pressure roller 37 presses and cures the film. After the film is cured, it is guided by the guide roller 38.

[0044] Based on the above structure, a limiting plate 32 is fixedly installed on the inner side wall of the mounting plate 10, and the limiting plate 32 is located on both sides of the coating roller 34. One end of one limiting plate 32 is attached to the outer wall of the coating roller 34, and the other end of the limiting plate 32 has a gap with the coating roller 34. The limiting plate 32 and the mounting plate 10 form a space for storing glue. The glue adheres to the surface of the coating roller 34 when the coating roller 34 rotates, and the glue is spread onto the film surface when the coating roller 34 contacts the film surface.

[0045] Meanwhile, a scraper shell 35 is provided on one side of the spreading roller 36. The opening of the scraper shell 35 is close to the surface of the spreading roller 36. Therefore, when the spreading roller 36 spreads the adhesive on the film surface, the adhesive stuck on the surface will be scraped off by the scraper shell 35 and fall into the interior of the scraper shell 35.

[0046] Before pressing the film, one end of the film needs to be pulled onto the winding mechanism 5 for subsequent winding after pressing. The surface of the conveyor belt mechanism 2 is equipped with a traction mechanism 4, which consists of a traction block 41, a fixing block 44, and a magnetic suction component. The magnetic suction component is divided into a magnetic suction plate 42 and a magnetic suction column 43. When the traction block 41 is initially located on the conveyor belt mechanism 2, the traction block 41 is fixed by the magnetic suction plate 42 and the metal sheet on the surface of the conveyor belt mechanism 2. Therefore, one end of the film is first fixed onto the fixing block 44. The fixing block 44 is a structure for clamping one end of the film in the prior art, so it is not described in detail. After the film is fixed, the conveyor belt mechanism 2 starts to operate, driving the fixing block 44 to move forward and pulling the film off the film roller 31. After the fixing block 44 passes the position of the pressing mechanism 3, the telescopic rod 9 installed on the top of the fixed shell 1 is activated, pulling the mounting plate 10 down to prepare for the pressing work.

[0047] At this time, glue is filled into the space formed by the limiting plate 32. When the film moves, it will drive the glue coating roller 34 to rotate under the action of friction. When the glue coating roller 34 rotates, the glue will adhere to the surface of the glue coating roller 34. When the glue coating roller 34 contacts the film surface, it will spread the glue onto the film surface. After the glue application is completed, it is ready to carry out the subsequent pressing work. The operator pulls down the substrate on the substrate roller 39 and attaches it to the film after the glue application is completed. Since the adhesion between the glue and the film is greater than the friction between the substrate, when the fixing block 44 pulls the film forward, it will simultaneously pull the substrate forward and enter the pressing position of the subsequent pressure roller 37 for pressing.

[0048] Furthermore, to improve the bonding effect between the film and the substrate, a support mechanism 7 is provided inside the conveyor belt mechanism 2. The support mechanism 7 includes a conveyor belt 71, a top block 72, a gear set 73, and a chain drive mechanism 74. The conveyor belt 71 is installed inside the conveyor belt mechanism 2 and fixed to the inner wall of the fixed shell 1. The chain drive mechanism 74 is installed at one end of the rotating shaft of the conveyor belt mechanism 2. The gear set 73 is provided on the inner wall of the chain drive mechanism 74. The gear set 73 meshes with the rotating roller of the conveyor belt 71, and the conveyor belt mechanism 2 drives the conveyor belt 71 synchronously. The conveyor belt 71 rotates, and the top block 72 on the surface of the conveyor belt 71 can lift the conveyor belt of the conveyor belt mechanism 2, so that the film and the roller can fully contact each other, further improving the pressing effect. Since the conveyor belt 71 is driven by the gear set 73, the conveyor belt 71 and the conveyor belt mechanism 2 move in the same direction and have the same operating rhythm. Therefore, the top block 72 on the surface of the conveyor belt 71 lifts the conveyor belt during the movement. The top block 72 and the conveyor belt mechanism 2 move synchronously, effectively reducing wear while lifting the conveyor belt.

[0049] As the fixed block 44 continues to move forward under the operation of the conveyor belt mechanism 2, when it reaches the position of the winding mechanism 5, the fixed block 44 is inserted into the mounting groove 54, and the magnetic suction groove 55 and the magnetic suction column 43 cooperate to attract each other. Since the attraction force of the magnetic suction groove 55 and the magnetic suction column 43 is greater than the attraction force of the magnetic suction piece 42 and the metal sheet on the surface of the conveyor belt mechanism 2, the fixed block 44 will detach from the surface of the conveyor belt mechanism 2. Furthermore, the attraction force of the two is greater than the pulling force of the fixed block 44 on the film and the substrate. Therefore, the film and the substrate can be pulled to move without the fixed block 44 detaching.

[0050] A set of mounting bases 51 are movably mounted on the outer wall of the fixed shell 1. A mounting block 6 is fixedly mounted on the outer wall of the mounting base 51. A lifting buckle mechanism is installed between the inner wall of the mounting block 6 and the mounting base 51. A rotating column 52 is rotatably connected to the top of the lifting buckle mechanism. A take-up roller 53 is mounted on the surface of the rotating column 52. When the fixed block 44 is inserted into the mounting groove 54, the lifting buckle mechanism is ready to release the fixing of the mounting base 51, and the mounting base 51 is popped out from the inside of the mounting block 6, which drives the rotating column 52 and the take-up roller 53 to lift up.

[0051] The lifting buckle mechanism includes a limiting mechanism 56 and an ejection spring 57. The ejection spring 57 is installed at the bottom of the mounting base 51. After the limiting mechanism 56 releases the fixing of the mounting base 51, the mounting base 51 pops out from the inside of the mounting block 6 under the action of the ejection spring 57. The limiting mechanism 56 includes a fixing block 561, which is slidably disposed on the surface of the mounting base 51. Insert blocks 562 are fixedly disposed at both ends of the fixing block 561. One end of the rotating column 52 is provided with an inclined groove that cooperates with the inclined surface of the insert block 562. A limiting block 563 is movably disposed on the inner wall of the mounting block 6, and a return spring 564 is disposed between the limiting block 563 and the mounting block 6. The surface of the mounting base 51 is provided with a limiting mechanism. When the fixing block 44 is inserted into the mounting slot 54, the drive mechanism installed at one end of the rotating column 52 causes the rotating column 52 to rotate, and the take-up roller 53 rotates accordingly. At this time, the inclined groove on the surface of the rotating column 52 contacts the inclined surface of the top insert block 562 of the fixing block 561 and presses the fixing block 561 downward. The inclined surface of the bottom insert block 562 of the fixing block 561 is inserted into the through hole on the top surface of the limiting block 563, which pushes the limiting block 563 out of the slot on the surface of the mounting base 51 and squeezes the return spring 564. At this time, the mounting base 51 pops out from the inside of the mounting block 6 under the action of the ejection spring 57, thereby lifting the take-up roller 53 to perform the take-up operation.

[0052] After the mounting base 51 pops out, the limiting block 563 is reset under the action of the reset spring 564. When the take-up roller 53 finishes winding, rotate the rotating column 52, align the top insert 562 of the fixing block 561 with the inclined groove on the surface of the rotating column 52, and press the mounting base 51 down until the limiting block 563 is reinserted into the slot, thereby re-fixing the mounting base 51. Then the take-up roller 53 can be replaced.

[0053] The contact surface between the fixing block 561 and the mounting base 51 is provided with multiple elastic pieces 565, and the surface of the mounting base 51 is provided with a groove 566. The cooperation between the elastic pieces 565 and the groove 566 realizes the fixation of the position of the fixing block 561.

[0054] Therefore, by fixing the film in advance by fixing the clip 44, the length of film that is not pressed between the film roller 31 and the take-up roller 53 is effectively reduced, thus reducing production costs.

[0055] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A composite device for flame-retardant PVC film, comprising a set of fixed housings (1) and a conveyor belt mechanism (2), wherein the conveyor belt mechanism (2) is located inside the fixed housings (1) and is controlled to operate by a motor (8) on the outer wall of the fixed housings (1), characterized in that: The top of the fixed shell (1) is equipped with a pressing mechanism (3) and a winding mechanism (5). The winding mechanism (5) includes a mounting base (51), a rotating column (52), a winding roller (53), and a lifting buckle mechanism. A set of mounting bases (51) are movably mounted on the outer wall of the fixed shell (1). A mounting block (6) is fixedly mounted on the outer wall of the mounting base (51). A lifting buckle mechanism is installed between the inner wall of the mounting block (6) and the mounting base (51). The top of the lifting buckle mechanism is rotatably connected to the rotating column (52). A winding roller (53) is mounted on the surface of the rotating column (52). An installation groove (54) is opened on the outer wall of the winding roller (53). A plurality of magnetic suction grooves (55) are opened on the inner wall of the installation groove (54). A traction mechanism is mounted on the surface of the conveyor belt mechanism (2). (4) The traction mechanism (4) includes a traction block (41), a fixing block (44) and a magnetic component. The magnetic component is installed on the surface of the traction block (41). The traction block (41) is magnetically connected to the conveyor belt mechanism (2) and the winding roller (53) through the magnetic component. A fixing block (44) is installed on one side of the traction block (41). The magnetic component includes a magnetic plate (42) and a magnetic column (43). Multiple magnetic plates (42) are fixedly set at the bottom of the traction block (41), and the traction block (41) is attracted to the metal sheet on the surface of the conveyor belt mechanism (2) through the magnetic plates (42). The magnetic column (43) is fixedly installed on one side of the traction block (41), and the traction block (41) is attracted to the magnetic groove (55) through the magnetic column (43) and inserted into the mounting groove (54).

2. The composite device for flame-retardant PVC film according to claim 1, characterized in that: A set of mounting plates (10) is fixedly installed on the top of the fixed shell (1). The pressing mechanism (3) is installed on the inner side of the mounting plate (10). The pressing mechanism (3) includes a film roller (31), a leveling roller (33), a glue-applying roller (34), a smoothing roller (36), a substrate roller (39), a pressure roller (37), and a guide roller (38), which are all rotatably arranged on the inner wall of the mounting plate (10) from left to right. The bottoms of the leveling roller (33), the glue-applying roller (34), the smoothing roller (36), the pressure roller (37), and the guide roller (38) are located on the same horizontal plane below the inner wall of the mounting plate (10). The installation height of the substrate roller (39) is located above the inner wall of the mounting plate (10). The installation height of the film roller (31) is located between the substrate roller (39) and the leveling roller (33).

3. The composite device for flame-retardant PVC film according to claim 2, characterized in that: The pressing mechanism (3) also includes a limiting plate (32) and a scraper shell (35). A set of the limiting plates (32) are fixedly installed on the inner side wall of the mounting plate (10), and the limiting plates (32) are located on both sides of the coating roller (34). One end of one limiting plate (32) is attached to the outer wall of the coating roller (34), and the other end of the limiting plate (32) has a gap with the coating roller (34). A scraper shell (35) is provided on one side of the spreading roller (36).

4. The composite device for flame-retardant PVC film according to claim 1, characterized in that: The lifting buckle mechanism includes a limiting mechanism (56) and an ejection spring (57). The bottom of the mounting base (51) is equipped with an ejection spring (57). The limiting mechanism (56) controls the mounting base (51) to pop out from the mounting block (6).

5. The composite device for flame-retardant PVC film according to claim 4, characterized in that: The limiting mechanism (56) includes a fixed block (561), an insert block (562), a limiting block (563), a return spring (564), an elastic sheet (565), and a groove (566). The fixed block (561) is slidably disposed on the surface of the mounting base (51). Insert blocks (562) are fixedly disposed at both ends of the fixed block (561). A limiting block (563) is movably disposed on the inner wall of the mounting block (6). A return spring (564) is disposed between the limiting block (563) and the mounting block (6). A slot for the limiting block (563) to be inserted is opened on the surface of the mounting base (51). Multiple elastic sheets (565) are disposed on the contact surface between the fixed block (561) and the mounting base (51). A groove (566) is opened on the surface of the mounting base (51).

6. The composite device for flame-retardant PVC film according to claim 1, characterized in that: The conveyor belt mechanism (2) is provided with a support mechanism (7) inside. The support mechanism (7) includes a conveyor belt (71), a top block (72), a gear set (73), and a chain drive mechanism (74). The conveyor belt (71) is installed inside the conveyor belt mechanism (2). A chain drive mechanism (74) is installed at one end of the rotating shaft of the conveyor belt mechanism (2). A gear set (73) is provided on the inner wall of the chain drive mechanism (74). The gear set (73) meshes with the rotating roller of the conveyor belt (71). The conveyor belt mechanism (2) drives the conveyor belt (71) to rotate. A plurality of top blocks (72) are provided on the surface of the conveyor belt (71). The top surface of the top block (72) is in contact with the back of the conveyor belt of the conveyor belt mechanism (2).

7. The composite device for flame-retardant PVC film according to claim 1, characterized in that: A telescopic rod (9) is installed on the top of the fixed shell (1), and the output end of the telescopic rod (9) is connected to the outer wall of the mounting plate (10).

8. A method of using a flame-retardant PVC film composite device, comprising a flame-retardant PVC film composite device as described in any one of claims 1-7, characterized in that: The specific operating steps are as follows: Step 1: Pull one end of the film on the film roller (31) down and fix it on the fixing block (44). Then start the conveyor belt mechanism (2). The conveyor belt mechanism (2) drives the fixing block (44) to pull the film forward. Step 2: After the fixed block (44) passes the pressing mechanism (3), the telescopic rod (9) pulls the mounting plate (10) down, and the pressing mechanism (3) begins to press. Step 3: When the fixing block (44) reaches the position of the winding mechanism (5), the magnetic pin (43) on the fixing block (44) is inserted into the magnetic groove (55) under the action of magnetic force for fixing; Step 4: After the fixing block (44) is fixed, the winding roller (53) rotates, the lifting buckle mechanism is unlocked, and the mounting base (51) pops out under the action of the reset spring (564) to start the subsequent winding work.

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