Adjustable plastic film blanking equipment and method

Abstract

The invention relates to the technical field of blanking, and discloses adjustable plastic film blanking equipment and method.The adjustable plastic film blanking equipment comprises a base and two side plates installed on the base, and a heating plate and a conveying belt are installed between the two side plates; a feeding frame is installed at the front end of the base, two rolling shafts on the feeding frame are used for feeding a plastic film and a protective film respectively, a heating roller A located at the front end of the heating plate is installed on the base, and the protective film is heated through the heating roller A. A protective film is heated and adhered to the plastic film, so that the plastic film is prevented from being in direct contact with conveying structures such as a conveying belt and a guide roller in the conveying process, the situation that the surface of the plastic film is scratched due to the fact that the conveying structures are adhered with dust is reduced, and the quality of the plastic film is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of punching technology, in particular to an adjustable plastic film punching device and method. Background Art

[0002] With the wide application of plastic products in various fields, the demand for plastic film processing is also growing. Various plastic films are beginning to be used in various places, and some plastic films used in screens, such as light guide films and backlight films, are usually processed by traditional punching equipment in the existing technology. However, these traditional equipment have many shortcomings.

[0003] First, the plastic film is transported through the conveying system. During the conveying process, the plastic film will be rubbed many times. When the conveying structures such as the conveyor belt and guide rollers are covered with dust, the surface of the plastic film will be scratched, affecting the quality of the plastic film.

[0004] Secondly, during the transportation process of the conveying system, the plastic film is stretchable and easy to stretch, so the plastic film is over-stretched during the transportation process. After cutting, the plastic film will slowly shrink, resulting in dimensional deviation.

[0005] To this end, the present invention provides an adjustable plastic film punching device and method. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the present invention provides an adjustable plastic film punching device and method, which effectively solves the problem of friction scratches during the plastic film conveying process.

[0007] The present invention provides the following technical solution: an adjustable plastic film punching device, comprising a base and two side plates installed on the base, and a heating plate and a conveyor belt are installed between the two side plates;

[0008] A material unloading rack is installed at the front end of the base, and two rollers on the material unloading rack unload the plastic film and the protective film respectively. A heating roller A located at the front end of the heating plate is installed on the base, and the protective film is heated by the heating roller A to soften the protective film and adhere to the plastic film, and the plastic film is heated to shrink and recover, and an exhaust pressure device located at the front end of the heating plate is installed on the two side plates, and the protective film adhered to the plastic film on the heating plate is squeezed and cooled by the exhaust pressure device;

[0009] The two side plates are provided with a transfer structure for translating the protective film adhered to the plastic film on the heating plate and a clamping structure for positioning the protective film on the heating plate. A punching structure A is provided on the base between the heating plate and the conveyor belt, and the punching structure A cuts the protective film adhered to the plastic film on the heating plate at a fixed length, and the cut plastic film sheet adhered to the protective film is transported by the conveyor belt.

[0010] The two side plates are equipped with a conveyor frame, a conveyor pair of rollers and a B heating roller located above the conveyor belt. The film substrate is stored by the conveyor frame, and the conveyor pair of rollers conveys the film substrate to the conveyor belt, and is heated and squeezed by the B heating roller to soften the film substrate and adhere to the plastic film and the protective film, so that the film substrate and the protective film wrap the plastic sheet;

[0011] The base is provided with a B punching structure located at the end of the conveyor belt, and the B punching structure performs breakpoint punching on the film substrate. The ends of the two side plates are provided with a knife roller and a knife seat roller for cutting both sides of the film substrate and the protective film. The end of the base is provided with a winding frame for winding the material.

[0012] Preferably, a protective film is placed on the roller on the unloading rack close to the base, and a plastic film is placed on the roller away from the base, so that when the plastic film and the protective film pass through the A heating roller, the protective film is located under the plastic film, and the protective film is heated and softened by the A heating roller and adheres to the plastic film.

[0013] Preferably, the speed at which the conveying rollers convey the film substrate is consistent with the conveying speed of the conveyor belt, so that the conveying rollers stably lay the film substrate on the conveyor belt, and the film substrate is wrapped with the protective film covered with the plastic film.

[0014] Preferably, the exhaust pressurizing device is an exhaust duct laid on two side panels, and the other end of the exhaust duct extends to the inside of the base and is connected to an air pump. A plurality of groups of inclined nozzles are provided on the exhaust duct. High-pressure gas is introduced into the exhaust duct through the air pump and sprayed through the nozzles onto the protective film adhered to the plastic film. The pressure of the high-pressure gas spray makes the plastic film and the protective film fit tightly and cools the protective film.

[0015] Preferably, the transfer structure includes two linear motors installed on two side plates, and a U-shaped frame is installed on the slide of the two linear motors, two positioning columns are installed at the bottom end of the U-shaped frame, an iron sheet is installed at the bottom end of the positioning columns, and the iron sheet slides on the heating plate, and the protective film covered with plastic film passes through the top of the iron sheet, a slidable movable block is provided on the positioning column, and an electromagnet is embedded inside the movable block, a reset spring is provided on the positioning column, and the two ends of the reset spring are respectively connected to the U-shaped frame and the movable block, when the electromagnet is energized, the movable block is adsorbed on the iron sheet, and the protective film covered with plastic film is pressed, and it is driven by the linear motor to move, and after the electromagnet is powered off, the movable block moves up and separates from the iron sheet under the elasticity of the reset spring.

[0016] Preferably, the clamping structure includes an iron bar embedded in the heating plate and a bracket installed on two side plates, the bracket is provided with a slidable guide column, the bottom end of the guide column is installed with a positioning block, and an electromagnet is installed inside the positioning block, the guide column is installed with a pressure spring located at the top of the bracket, and the top of the guide column is installed with a nut for adjusting the pressure spring, when the electromagnet is energized, the positioning block moves down and adsorbs on the iron bar and clamps the protective film, and when the electromagnet is powered off, the positioning block moves up and separates from the iron bar under the drive of the pressure spring.

[0017] Preferably, the A punching structure includes a rectangular frame, a knife seat is installed on the inner side of the rectangular frame, a slidable knife holder is provided on the inner side of the rectangular frame, and a knife for cutting the plastic film and the protective film is installed on the knife holder, the knife holder is pushed by an electric cylinder installed on the rectangular frame, and the plastic film and the protective film pass over the knife seat.

[0018] Preferably, the B punching structure includes all structures of the A punching structure, and the tool holder on the B punching structure is equipped with a tool for performing breakpoint punching on the film substrate and a matching tool for cutting breakpoint holes on the film substrate that are easy to tear.

[0019] An adjustable plastic film punching method, the specific operation of which is as follows:

[0020] S1, the plastic film and the protective film on the unloading rack are led out, so that they are overlapped and guided by the A heating roller and laid on the heating plate, and the A heating roller heats the protective film to soften it and adhere it to the plastic film, and the plastic film shrinks and recovers by heating, and the exhaust and pressurization device sprays high-pressure gas to extrude and cool the plastic film and the protective film, so that the protective film adheres to the plastic film to complete the bonding;

[0021] S2, the transfer structure drives the plastic film and the protective film to move on the heating plate, so that the plastic film and the protective film move forward a specified distance, and fall onto the conveyor belt through the A punching structure, and the plastic film and the protective film are clamped by the clamping structure, so that the A punching structure cuts the laminated plastic film and the protective film into sheets, and the cut sheets are transported and exported through the conveyor belt;

[0022] S3, the conveying roller drives the film substrate on the conveying frame to move to the conveyor belt and lay it on the plastic film and protective film sheets. After being heated and squeezed by the heating roller B, the film substrate is softened and attached to the plastic film and protective film. In this way, the plastic film is wrapped, so that the sheets are attached to the film substrate at intervals and output along the conveyor belt;

[0023] S4. The conveyor belt conveys the film substrate to the B punching structure. The B punching structure performs breakpoint processing on the film substrate between the sheets to form breakpoint holes that are easy to tear. Then, the knife roller and the knife seat roller are used to cut the excess film substrate and protective film on both sides of the plastic film, and the film is rolled up through the winding frame.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) By heating and gluing a protective film on the plastic film, the plastic film is prevented from directly contacting with conveying structures such as conveyor belts and guide rollers during transportation, and the surface of the plastic film is less likely to be scratched due to dust sticking to the conveying structure, thereby effectively improving the quality of the plastic film;

[0026] (2) After the plastic film is punched, all the cut sheets are adhered to the film substrate, and the sheets are rolled up after the edge cutting for easy collection, and the film substrate between each plastic film is provided with a tearing break point line so that each plastic film on each roll of the film substrate can be easily taken out;

[0027] (3) The plastic film is heated to recover its shrinkage. At the same time, the protective film is used to prevent the plastic film from being overstretched during transportation, reduce the problem of dimensional deviation caused by the slow shrinkage of the plastic film after cutting, and ensure the dimensional stability of the plastic film. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the transfer structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the clamping structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the punching structure A of the present invention.

[0032] In the figure: 1. base; 2. side plate; 3. heating plate; 4. conveyor belt; 5. unloading rack; 6. clamping structure; 7. exhaust and pressurizing device; 8. transfer structure; 9. A punching structure; 10. conveyor rack; 11. conveying roller pair; 12. B heating roller; 13. B punching structure; 14. knife roller; 15. knife seat roller; 16. winding rack; 17. A heating roller; 81. linear motor; 82. U-shaped frame; 83. positioning column; 84. iron sheet; 85. movable block; 86. reset spring; 61. iron bar; 62. bracket; 63. guide column; 64. positioning block; 65. pressure spring; 91. rectangular frame; 92. knife seat; 93. knife rack. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of known functions and known components to avoid unnecessary confusion of the concepts of the present invention.

[0034] See also Figure 1 An adjustable plastic film punching device includes a base 1 and two side panels 2 installed on the base 1. The two side panels 2 are vertically installed on the base 1 and fixed by bolts or welding to ensure that the side panels 2 are firmly connected to the base 1 to provide a stable support structure for other components.

[0035] The unloading rack 5 is installed at the front end of the base 1 and fixed by bolts or slots to stabilize its position. The two rollers on the unloading rack 5 can provide plastic film and protective film materials for subsequent processing.

[0036] The heating plate 3 is horizontally installed between the two side plates 2, and its two ends are connected to the side plates 2 by slots or bolts to ensure the stability of the heating plate 3. The heating plate 3 continuously heats the plastic film during the transportation process to make the plastic film deformed due to stretching shrink and recover. The heating temperature of the heating plate 3 is relatively low, and the temperature of the heating plate 3 cannot soften the plastic film and the protective film, and can only make the deformed plastic film recover by heat.

[0037] A heating roller 17 is installed on the base 1 and is located at the front end of the platform 3. Its two ends are fixed on the base 1 through bearing seats and are connected to the heating control system. The heating control system can be connected to the overall control system of the equipment through wires or other signal transmission methods to accurately control the temperature of the A heating roller 17 so that the protective film is softened and fits the plastic film. Since the A heating roller 17 contacts and redirects the plastic film and the protective film, there is an extrusion force between the plastic film and the protective film, so that the plastic film and the protective film are fit.

[0038] The exhaust pipe of the exhaust pressurizing device 7 is laid on the two side panels 2, one end of which is connected to the air pump through a sealing joint. The air pump can be installed at a suitable position inside or outside the base 1, and the other end of the exhaust pipe extends to the inside of the base 1 and is connected to the air pump. The exhaust pipe is fixed to the side panel 2 by means of a clamp or welding, etc., to ensure that it is firmly connected and well sealed, so that the high-pressure gas can be effectively delivered to the nozzle to extrude and cool the protective film and the plastic film, so that the exhaust pressurizing device 7 can quickly cool the softened plastic film and the protective film to restore them to their original state, and the high-pressure gas sprayed on the protective film and the plastic film can also make the protective film and the plastic film adhere more tightly.

[0039] See also Figure 2 The two linear motors 81 of the transfer structure 8 are installed on the two side plates 2 and fixed by bolts or slots. The slide of the linear motor 81 can slide up and down smoothly on the side plates 2. A U-shaped frame 82 is installed on the slide of the two linear motors 81. Two positioning columns 83 are installed at the bottom end of the U-shaped frame 82. An iron sheet 84 is installed at the bottom end of the positioning column 83, and the iron sheet 84 slides on the heating plate 3. The protective film covered with plastic film passes through the top of the iron sheet 84. A slidable movable block 85 is provided on the positioning column 83, and an electromagnet is embedded in the movable block 85. A reset spring 86 is provided on the positioning column 83, and the two ends of the reset spring 86 are respectively connected to the U-shaped frame 82 and the movable block 85.

[0040] When the electromagnet is energized, the movable block 85 is adsorbed on the iron sheet 84, and presses the protective film adhered to the plastic film, and is driven by the linear motor 81 to move. The linear motor 81 drives the movable block 85 and the iron sheet 84 to move a specified distance. The movable block 85 and the iron sheet 84 clamp the protective film and the plastic film and move. Then the electromagnet is powered off, and under the elasticity of the reset spring 86, the movable block 85 moves up and separates from the iron sheet 84, and returns to its original position under the drive of the linear motor 81. In this way, the protective film and the plastic film are moved for cutting, and the contact between the conveying roller and the plastic film is avoided, the friction between the plastic film and the equipment is reduced, and the plastic film is avoided from being scratched. In the process of conveying the protective film and the plastic film, the heating plate 3 continues to heat. This temperature cannot soften the protective film and the plastic film, but can shrink and recover the stretched plastic film.

[0041] See also Figure 3 The clamping structure 6 includes an iron bar 61 embedded in the heating plate 3 and a bracket 62 installed on the two side plates 2. The bracket 62 is provided with a slidable guide column 63. A positioning block 64 is installed at the bottom end of the guide column 63, and an electromagnet is installed inside the positioning block 64. A pressure spring 65 located at the top of the bracket 62 is installed on the guide column 63, and a nut for adjusting the pressure spring 65 is installed at the top of the guide column 63.

[0042] When the transfer structure 8 completes the material feeding, the electromagnet on the clamping structure 6 is energized, the positioning block 64 moves down and adsorbs on the iron bar 61, and clamps the protective film to facilitate the transfer structure 8 to return to its original position and the material punching process. When the electromagnet is de-energized, the pressure spring 65 drives the positioning block 64 to move up and separate from the iron bar 61, so that the material can pass through the clamping structure 6 again.

[0043] See also Figure 4 A rectangular frame 91 of the punching structure 9 is installed on the base 1 between the platform 3 and the conveyor belt 4 and fixed by bolts or slots. A knife holder 92 is installed on the inner side of the rectangular frame 91. The knife holder 92 is connected to the rectangular frame 91 by slots or bolts to ensure the stability of the position of the knife holder 92. A slidable knife holder 93 is installed on the inner side of the rectangular frame 91. The knife holder 93 is connected to an electric cylinder that pushes it to slide. The electric cylinder is installed on the rectangular frame 91. The knife holder 93 is pushed to slide in the rectangular frame 91 by the extension and contraction of the electric cylinder, so as to realize the lifting and lowering of the knife, and the protective film and the plastic film are cut without damaging the plastic film.

[0044] The conveyor belt 4 is installed under the heating plate 3, and the transmission shafts at both ends are installed on the side plate 2 through bearing seats and are connected to the drive motor. The drive motor can be fixed on the side plate 2 or the base 1 to provide power for the conveyor belt 4 so that it can operate normally. The protective film and plastic film cut into sheets are transported through the conveyor belt 4, and the distance between each protective film and plastic film on the conveyor belt 4 is the same.

[0045] The conveyor frame 10 is mounted on the two side plates 2, located above the conveyor belt 4, and fixed by bolts or slots, etc., to provide storage space for the film substrate. The conveyor rollers 11 are mounted on the two side plates 2, and both ends thereof are fixed to the side plates 2 through bearing seats, and are connected to the drive motor, which can be fixed to the side plates 2 or the base 1 to provide power for the conveyor rollers 11. The position of the conveyor rollers 11 corresponds to the conveyor belt 4, ensuring that the film substrate can be stably conveyed and introduced onto the conveyor belt 4, and the film substrate can be laid on the protective film and the plastic film.

[0046] The B heating roller 12 is installed on the two side plates 2 and is located above the conveyor belt 4. Its two ends are fixed on the side plates 2 through bearing seats and are connected to the heating control system. The heating control system can be connected to the overall control system of the equipment through wires or other signal transmission methods to accurately control the temperature of the B heating roller 12. The position of the B heating roller 12 corresponds to the conveyor roller 11 and the conveyor belt 4, ensuring that the film substrate conveyed to the conveyor belt 4 can be heated and extruded;

[0047] The B punching structure 13 is similar to the A punching structure 9, which is installed on the base 1 at the end of the conveyor belt 4 and fixed by bolts or slots. The tool holder 93 on the B punching structure 13 is equipped with a tool for performing breakpoint punching on the film substrate, and its connection relationship is the same as that of the tool holder 93 in the A punching structure 9. The electric cylinder pushes the tool holder 93 to slide to realize the lifting and lowering of the tool, and performs breakpoint punching operation on the film substrate, so that the film substrate between each plastic film is provided with a breakpoint line that is easy to tear, so that each plastic film on each roll of film substrate is easy to take.

[0048] The knife roller 14 is installed at the ends of the two side plates 2 and fixed by bolts or slots. Its position corresponds to the end of the conveyor belt 4 so as to cut both sides of the film substrate and the protective film to avoid too much film substrate and protective film on the edges of the plastic film.

[0049] The winding frame 16 is installed at the end of the base 1 and is fixed by bolts or slots to provide a winding function for the processed materials.

[0050] An adjustable plastic film punching method, the specific operation of which is as follows:

[0051] S1, the plastic film and the protective film on the unloading rack 5 are led out, so that they are overlapped and guided by the A heating roller 17 and laid on the heating plate 3, and the A heating roller 17 heats the protective film to soften it and adhere it to the plastic film, and the plastic film shrinks and recovers by heating, and the exhaust and pressurizing device 7 sprays high-pressure gas to extrude and cool the plastic film and the protective film, so that the protective film adheres to the plastic film to complete the bonding;

[0052] S2, the transfer structure 8 drives the plastic film and the protective film to move on the heating plate 3, so that the plastic film and the protective film move forward a specified distance, and fall onto the conveyor belt 4 through the A punching structure 9, and the plastic film and the protective film are clamped by the clamping structure 6, so that the A punching structure 9 cuts the laminated plastic film and the protective film into sheets, and the cut sheets are transported and exported through the conveyor belt 4;

[0053] S3, the conveying roller pair 11 drives the film substrate on the conveying frame 10 to move to the conveyor belt 44 and lay it on the sheet of plastic film and protective film, and is heated and squeezed by the B heating roller 12 to soften the film substrate and adhere to the plastic film and protective film. In this way, the plastic film is wrapped, so that the sheet is intermittently adhered to the film substrate and is output along the conveyor belt 4;

[0054] S4, the conveyor belt 4 conveys the film substrate to the B punching structure 13, and the B punching structure 13 performs breakpoint processing on the film substrate located between the sheets to form breakpoint holes that are easy to tear. Then, the knife roller 14 and the knife seat roller 15 are used to cut the excess film substrate and protective film on both sides of the plastic film, and the film is rolled up through the winding frame 16.

[0055] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. An adjustable plastic film punching device, characterized in that: It comprises a base (1) and two side plates (2) mounted on the base (1), and a heating plate (3) and a conveyor belt (4) are mounted between the two side plates (2); A material unloading rack (5) is installed at the front end of the base (1), and two rollers on the material unloading rack (5) unload the plastic film and the protective film respectively. A heating roller (17) located at the front end of the heating plate (3) is installed on the base (1), and the protective film is heated by the A heating roller (17) to soften the protective film and adhere to the plastic film, and the plastic film is heated to shrink and recover. An exhaust pressure device (7) located at the front end of the heating plate (3) is installed on the two side plates (2), and the exhaust pressure device (7) is used to extrude and cool the protective film that is transported and adhered to the plastic film on the heating plate (3); A transfer structure (8) for translating the protective film adhered to the plastic film on the heating plate (3) and a clamping structure (6) for positioning the protective film on the heating plate (3) are installed on the two side plates (2); an A punching structure (9) is installed on the base (1) between the heating plate (3) and the conveyor belt (4); and the A punching structure (9) cuts the protective film adhered to the plastic film on the heating plate (3) into a fixed length, and the cut plastic film sheet adhered to the protective film is transported by the conveyor belt (4); A conveying frame (10), a conveying pair of rollers (11) and a B heating roller (12) located above the conveying belt (4) are installed on the two side plates (2); the film substrate is stored by the conveying frame (10), and the conveying pair of rollers (11) conveys the film substrate onto the conveying belt (4), and is heated and pressed by the B heating roller (12) to soften the film substrate and adhere it to the plastic film and the protective film, so that the film substrate and the protective film wrap the plastic sheet; The base (1) is provided with a B punching structure (13) located at the end of the conveyor belt (4), and the B punching structure (13) performs breakpoint punching on the film substrate. The ends of the two side plates (2) are provided with a knife roller (14) and a knife seat roller (15) for cutting the two sides of the film substrate and the protective film. The end of the base (1) is provided with a winding frame (16) for winding the material.

2. The adjustable plastic film punching device according to claim 1, characterized in that: A protective film is placed on the roller of the unloading rack (5) close to the base (1), and a plastic film is placed on the roller far from the base (1), so that when the plastic film and the protective film pass through the A heating roller (17), the protective film is located below the plastic film, and the protective film is heated and softened by the A heating roller (6) and adheres to the plastic film.

3. The adjustable plastic film punching device according to claim 1, characterized in that: The speed at which the conveying roller pair (11) conveys the film substrate is consistent with the conveying speed of the conveyor belt (4), so that the conveying roller pair (11) stably lays the film substrate on the conveyor belt (4) so ​​that the film substrate is wrapped with the protective film of the adhesive plastic film.

4. The adjustable plastic film punching device according to claim 1, characterized in that: The exhaust pressurizing device (7) is an exhaust duct laid on the two side plates (2), and the other end of the exhaust duct extends to the inside of the base (1) and is connected to the air pump. The exhaust duct is provided with a plurality of groups of inclined nozzles. High-pressure gas is introduced into the exhaust duct through the air pump and sprayed onto the protective film adhered to the plastic film through the nozzle. The pressure of the high-pressure gas spray makes the plastic film and the protective film fit tightly and cools the protective film.

5. The adjustable plastic film punching device according to claim 1, characterized in that: The transfer structure (8) comprises two linear motors (81) mounted on two side plates (2), and a U-shaped frame (82) is mounted on the slides of the two linear motors (81), two positioning columns (83) are mounted at the bottom end of the U-shaped frame (82), an iron sheet (84) is mounted at the bottom end of the positioning column (83), and the iron sheet (84) slides on the heating plate (3), and a protective film covered with a plastic film passes through the top of the iron sheet (84), and a slidable movable block (85) is provided on the positioning column (83). The movable block (85) is embedded with an electromagnet inside, and the positioning column (83) is provided with a return spring (86), and the two ends of the return spring (86) are respectively connected to the U-shaped frame (82) and the movable block (85). When the electromagnet is energized, the movable block (85) is adsorbed on the iron sheet (84) and presses the protective film adhered to the plastic film, and is driven to move by the linear motor (81). After the electromagnet is powered off, the movable block (85) moves up and separates from the iron sheet (84) under the elasticity of the return spring (86).

6. The adjustable plastic film punching device according to claim 1, characterized in that: The clamping structure (6) comprises an iron bar (61) embedded in the heating plate (3) and a bracket (62) mounted on two side plates (2); a slidable guide column (63) is provided on the bracket (62); a positioning block (64) is mounted at the bottom end of the guide column (63); an electromagnet is mounted inside the positioning block (64); a pressure spring (65) located at the top end of the bracket (62) is mounted on the guide column (63); a nut for adjusting the pressure spring (65) is mounted at the top end of the guide column (63); when the electromagnet is energized, the positioning block (64) moves downward and is adsorbed on the iron bar (61) and clamps the protective film; when the electromagnet is powered off, the positioning block (64) moves upward and is separated from the iron bar (61) under the drive of the pressure spring (65).

7. The adjustable plastic film punching device according to claim 1, characterized in that: The A punching structure (9) comprises a rectangular frame (91), a knife seat (92) is installed on the inner side of the rectangular frame (91), a slidable knife holder (93) is provided on the inner side of the rectangular frame (91), and a knife for cutting the plastic film and the protective film is installed on the knife holder (93), the knife holder (93) is pushed by an electric cylinder installed on the rectangular frame (91), and the plastic film and the protective film pass over the knife seat (92).

8. The adjustable plastic film punching device according to claim 7, characterized in that: The B punching structure (13) includes all the structures of the A punching structure (9), and the tool holder (93) on the B punching structure (13) is equipped with a tool for punching the film substrate at breakpoints and a matching tool for cutting breakpoint holes on the film substrate that are easy to tear.

9. An adjustable plastic film punching method, characterized in that: The adjustable plastic film punching device according to any one of claims 1 to 8 is used, and its specific operation is as follows: S1, the plastic film and the protective film on the unloading rack (5) are guided out so as to overlap and be laid on the heating plate (3) through the A heating roller (17), and the protective film is heated by the transfer structure (8) and the A punching structure (9), so as to soften and adhere to the plastic film, and the plastic film is shrunk and restored by heating, and the exhaust and pressurizing device (7) sprays high-pressure gas to extrude and cool the plastic film and the protective film, so that the protective film adheres to the plastic film to complete the bonding; S2, the transfer structure (8) drives the plastic film and the protective film to move on the heating plate (3), so that the plastic film and the protective film move forward a specified distance and fall onto the conveyor belt (4) through the A punching structure (9), and the plastic film and the protective film are clamped by the clamping structure (6), so that the A punching structure (9) cuts the laminated plastic film and the protective film into sheets, and the cut sheets are transported and exported through the conveyor belt (4); S3, the conveying roller pair (11) drives the film substrate on the conveying frame (10) to move to the conveying belt (4) (4) and lay it on the sheet of plastic film and protective film, and is heated and squeezed by the B heating roller 12 to soften the film substrate and adhere to the plastic film and protective film. In this way, the plastic film is wrapped, so that the sheet is intermittently adhered to the film substrate and output along the conveying belt (4); S4, the conveyor belt (4) conveys the film substrate to the B punching structure (13), and the B punching structure (13) performs breakpoint processing on the film substrate between the sheets to form breakpoint holes that are easy to tear. Then, the knife roller (14) and the knife seat roller (15) are used to cut the excess film substrate and protective film on both sides of the plastic film, and the film is rolled up through the winding frame (16).

Images