Protective film cutting device and method

Abstract

The technical solution to the technical problem of the present invention is to provide a protective film cutting device and method for cutting a protective film coated on a workpiece. The protective film cutting device includes a film fixing mechanism, a box pressing mechanism, and a film cutting mechanism. The film fixing mechanism fixes the protective film on the surface of the workpiece. The box pressing mechanism cooperates with the film fixing mechanism to generate a gap between the workpiece and the protective film. The film cutting mechanism cuts the protective film at the gap. The protective film cutting method includes fixing the protective films on opposite sides of the workpiece; applying force to the workpiece or the protective film to generate a gap between the workpiece and the protective film; and cutting the protective film at the gap.

Description

[Technical field]

[0001] The invention relates to the field of packaging, and in particular to a protective film cutting device and method. [Background technology]

[0002] The function of the protective film is to prevent the product from being scratched or damaged due to accidental friction or collision during production or transportation. That is, during production or transportation, the protective film completely covers the product. Since the protective film is a process protection, it needs to be torn off in the next process, so it is required to be easy to tear off from the product.

[0003] The existing method of making it easy to tear off the protective film from the product is to make an incision on the protective film that completely covers the surface of the product, and then tear off the protective film from the incision. However, when making the incision, the product is usually damaged, the surface of the protective film is wrinkled, and the width of the incision cannot be guaranteed, resulting in the protective film breaking when tearing off, and it cannot be conveniently torn off at one time. [Summary of the invention]

[0004] In order to overcome the problems of existing protective film cutting, the present invention provides a protective film cutting device and method.

[0005] The technical solution to the technical problem of the present invention is to provide a protective film cutting device for cutting a protective film coated on a workpiece, the protective film cutting device comprises a film fixing mechanism, a box pressing mechanism, and a film cutting mechanism. The film fixing mechanism fixes the protective film on the surface of the workpiece, the box pressing mechanism cooperates with the film fixing mechanism to generate a gap between the workpiece and the protective film, and the film cutting mechanism cuts the protective film at the gap.

[0006] Preferably, the box pressing mechanism applies force to the workpiece and / or the film fixing mechanism applies force to the protective film, so that the workpiece is displaced relative to the protective film, so that a gap is generated between the workpiece and the protective film.

[0007] Preferably, the box pressing mechanism applies force to the workpiece from the non-protective film fixed side and / or the film fixing mechanism applies force to the protective film in the direction of the protective film fixed side, so that the workpiece is displaced relative to the protective film to generate a gap between the workpiece and the protective film.

[0008] Preferably, the film fixing mechanism comprises a first film fixing component and a second film fixing component, wherein the first film fixing component and the second film fixing component are respectively arranged on opposite sides of the workpiece, and the first film fixing component and the second film fixing component cooperate with each other to fix the protective film on opposite sides of the workpiece surface.

[0009] Preferably, the first film fixing assembly includes a first adhesive roll device and a first support assembly, the first adhesive roll device is rotatably connected to the first support assembly, and the first adhesive roll device can rotate around the first support assembly;

[0010] The second film fixing assembly includes a second adhesive rolling device and a second support assembly. The second adhesive rolling device is rotatably connected to the second support assembly, and the second adhesive rolling device can rotate around the second support assembly.

[0011] Preferably, the first adhesive tape rolling device comprises a first fixed frame, a first material receiving shaft, a first rotating shaft and a first adhesive tape roll; the first adhesive tape roll provides an adhesive tape, which is wound around the first material receiving shaft and affixed to a protective film with the adhesive surface of the adhesive tape; the first material receiving shaft rewinds the adhesive tape adhered to the protective film; the first rotating shaft is rotatably matched with the first support assembly, so that the first fixed frame rotates around the first support assembly;

[0012] The second tape rolling device includes a second fixed frame, a second material receiving shaft, a second rotating shaft and a second tape roll; the second tape roll provides tape, which is wound around the second material receiving shaft and adheres to a protective film with the adhesive surface of the tape; the second material receiving shaft rewinds the tape adhered to the protective film; the second rotating shaft rotates in cooperation with the first support assembly to allow the second fixed frame to rotate around the second support assembly.

[0013] Preferably, the first support assembly includes a first base and a first rotation hole, wherein the first rotation hole is disposed on the first base and rotatably cooperates with the first rotation axis so that the first base can rotate relative to the first fixing frame;

[0014] The second support assembly includes a second base and a second rotating hole. The second rotating hole is arranged on the second base and is rotationally matched with the second rotating shaft so that the second base can rotate relative to the second fixing frame.

[0015] Preferably, the first film fixing assembly and the second film fixing assembly fix the protective films on opposite sides of the workpiece surface through suction cups or vacuum adsorption.

[0016] Preferably, the box pressing mechanism also includes a fixed guide rod, a box pressing cylinder, a pressing block and a support frame; the support frame is connected to the fixed guide rod, and the position of the support frame relative to the workpiece can be adjusted on the fixed guide rod; the box pressing cylinder is connected to the support frame and to the pressing block, and can drive the pressing block to move during operation.

[0017] Preferably, the protective film cutting equipment also includes a film suction mechanism, which includes a fixed column, a film suction support frame, a film suction cylinder and a suction cup assembly; the film suction support frame is connected to the fixed column, and the position of the film suction support frame on the fixed column relative to the workpiece can be adjusted; the film suction cylinder is connected to the film suction support frame, and the suction cup assembly is connected to the film suction cylinder.

[0018] Preferably, the suction cup assembly includes a suction cup and a suction cup fixing part, the suction cup fixing part is connected to the film suction cylinder, and the suction cups are distributed in rows on a side of the suction cup fixing part close to the workpiece to absorb the protective film at the gap between the workpieces.

[0019] Preferably, the suction cup fixing member is provided with a through hole, and the suction cups are distributed on two opposite sides, three sides or four sides of the through hole.

[0020] Preferably, the film cutting mechanism also includes a film cutting support frame, a tool and a film cutting cylinder. The film cutting cylinder is connected to the tool, and drives the tool to move when the film cutting cylinder is working; the film cutting cylinder is connected to the film cutting support frame, and the tool passes through the perforation to cut the protective film; the film cutting support frame is connected to the film suction support frame, and can move on the fixed column following the film suction support frame.

[0021] Preferably, the protective film cutting device further comprises a positioning mechanism, which comprises a substrate and a limiting block; the limiting block is arranged around three sides of the substrate to form a limiting structure to limit the displacement of the workpiece relative to the substrate.

[0022] Preferably, the positioning mechanism further comprises a connecting member, which is connected to the substrate and is an elastic member, so that when the workpiece is pressed by the pressing block, it can be displaced, thereby generating a sufficient gap between the workpiece and the protective film.

[0023] The invention provides a protective film cutting method, which comprises fixing protective films on two opposite sides of a workpiece; applying force to the workpiece or the protective film to generate a gap between the workpiece and the protective film; and cutting the protective film at the gap.

[0024] Preferably, the method further comprises, before the protective film on the surface of the workpiece is fixed, positioning the workpiece.

[0025] Preferably, the method further comprises, after a gap is generated between the workpiece and the protective film and before the protective film is cut at the gap, sucking and leveling the protective film.

[0026] Compared with the prior art, the protective film cutting device and method provided by the present invention have the following advantages:

[0027] 1. The protective film covering the surface of the workpiece is fixed by a film fixing mechanism to restrict the movement of the workpiece so that the protective film moves with it. Then, the box pressing mechanism or the film fixing mechanism is used to cooperate. After the protective film is fixed by the film fixing mechanism, the workpiece and the protective film covering the surface of the workpiece are displaced relative to each other, thereby generating a gap between the workpiece and the protective film, and then cutting the protective film at the gap. Due to the existence of the gap, the workpiece will not be damaged during cutting.

[0028] 2. The protective film covering the surface of the workpiece is fixed from opposite sides of the workpiece by the cooperation of the first film fixing assembly and the second film fixing assembly, so that the protective film will not be wrinkled when relative displacement occurs between the workpiece and the protective film.

[0029] 3. The first film fixing assembly and the second film fixing assembly fix the protective film wrapped on the surface of the workpiece by adhesive tape, so that the protective film is more evenly stressed and is more likely to have a gap with the workpiece when subjected to a force in a third direction. The film fixing mechanism adopts the adhesive tape bonding method, so that the protective film is fixed in a larger range, thus preventing wrinkles.

[0030] 4. Use the positioning mechanism to position the workpiece, and then use the film fixing mechanism to fix each workpiece after it is positioned by the positioning mechanism, so that the workpiece can be placed in the same position each time, so that the film fixing mechanism can fix the protective film in the same place each time.

[0031] 5. The positioning mechanism is connected to the supporting mechanism through an elastic member, so that when the workpiece is subjected to the force of the box pressing mechanism, it can retract, thereby creating a gap between the workpiece and the protective film.

[0032] 6. Use the film suction mechanism to cooperate with the film fixing mechanism and the box pressing mechanism to make the inclined gap between the workpiece and the protective film covering the surface of the workpiece be adsorbed and leveled, so that when the film cutting mechanism cuts the protective film from the gap, the protective film on the surface of the workpiece can be cut to 1mm-2mm less than the width of the workpiece, making it easier to tear off.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Brief Description of the Drawings

[0034] Figure 1A It is a first-perspective stereoscopic structural schematic diagram of a protective film cutting device provided by the present invention.

[0035] Figure 1B It is a second-viewing perspective stereoscopic structural schematic diagram of a protective film cutting device provided by the present invention.

[0036] Figure 2A It is a schematic diagram of the three-dimensional structure of a workpiece to be processed according to the present invention.

[0037] Figure 2B It is a schematic diagram of the cross-sectional structure of a workpiece to be processed according to the present invention.

[0038] Figure 3A It is a schematic diagram of the positioning mechanism structure.

[0039] Figure 3B It is a schematic diagram of the positional relationship between the supporting mechanism and the positioning mechanism.

[0040] Figure 4A It is a schematic diagram of the positional relationship between the film fixing mechanism and the supporting mechanism.

[0041] Figure 4B It is a schematic diagram of the structure of the film fixing mechanism.

[0042] Figure 4C It is a schematic diagram of the stereoscopic structure of the first film rolling device from a first perspective.

[0043] Figure 4D It is a schematic diagram of the stereoscopic structure of the first film rolling device from a second perspective.

[0044] Figure 4E It is a schematic diagram of the position relationship between the first glue roll device and the first support assembly.

[0045] Figure 4F It is a schematic diagram of the structure of the first support assembly.

[0046] Figure 5A It is a schematic diagram of the stereoscopic structure of the second film rolling device from a first perspective.

[0047] Figure 5B It is a schematic diagram of the stereoscopic structure of the second film rolling device from a second viewing angle.

[0048] Figure 5C It is a schematic diagram of the positional relationship between the second adhesive roll device and the second support assembly.

[0049] Figure 5D It is a schematic diagram of the structure of the second support assembly.

[0050] Figure 5E It is a structural schematic diagram of the matching relationship between the first film-fixing component and the second film-fixing component.

[0051] Fig. 6A It is a three-dimensional structural diagram of the box pressing mechanism.

[0052] Figure 6B It is a schematic diagram of the positional relationship between the box pressing mechanism and the supporting mechanism.

[0053] Figure 6C It is a schematic diagram of the box pressing mechanism pressing down the protective film.

[0054] Fig.6D yes Figure 6C A partial enlarged view of point A.

[0055] Fig. 6E This is a first position relationship diagram of the first film-fixing component and the second film-fixing component driving the workpiece and the protective film to move and the box pressing mechanism.

[0056] Fig. 6FThis is a second position relationship diagram of the first film-fixing component and the second film-fixing component driving the workpiece and the protective film to move and the box pressing mechanism.

[0057] Fig. 7A It is a schematic diagram of the film suction mechanism structure.

[0058] Figure 7B It is a schematic diagram of the positional relationship between the film suction mechanism and the supporting mechanism, the film fixing mechanism, and the box pressing mechanism.

[0059] Figure 7C It is a schematic diagram of the film suction mechanism adsorbing the protective film.

[0060] Fig.7D It is a partially enlarged schematic diagram of the cooperation between the film suction mechanism and the film cutting mechanism.

[0061] Fig. 7E yes Figure 7C A partial enlarged view of point B.

[0062] Fig. 8A It is a schematic diagram of the film cutting mechanism structure.

[0063] Figure 8B It is a schematic diagram of the positional relationship between the film cutting mechanism and the film sucking mechanism.

[0064] Fig. 9 The present invention is a flowchart of a protective film cutting method.

[0065] Description of reference numerals: M, workpiece; 20, supporting mechanism; 30, positioning mechanism; 301, substrate; 303, limiting block; 305, connecting member; 40, film fixing mechanism; 41, first film fixing assembly; 42, second film fixing assembly; 401, first adhesive rolling device; 4011, first fixing frame; 4012, first material receiving rotating shaft; 4014, first adhesive tape material roll; 4015, first rotating shaft; 4016, first roller; 403, first support assembly; 4031, first cylinder; 4035, first base; 4037, first rotating hole; 405, second adhesive rolling device; 4051, second fixed frame; 4052, second material receiving shaft; 4054, second adhesive tape roll; 4055, second rotating shaft; 4056, second roller; 407, second support assembly; 4071, second cylinder; 4075, second base; 4077, second rotating hole; 50, box pressing mechanism; 501, fixed guide rod; 502, box pressing cylinder; 503, pressing block; 504, supporting frame; 60, film absorbing mechanism; 601, fixed column; 602, film absorbing supporting frame; 603, film absorbing cylinder; 604, suction cup assembly; 6041, suction cup; 6042, suction cup fixing part; 6043, perforation; 70, film cutting mechanism; 701, film cutting support frame; 703, cutter; 705, film cutting cylinder. [Specific implementation method]

[0066] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0067] See also Figure 1A-1B The present invention provides a protective film cutting device 10 for cutting a protective film on the surface of a workpiece M so that a user can tear open the film through the cut and take out the workpiece M in the protective film.

[0068] The protective film cutting device 10 comprises a supporting mechanism 20, a positioning mechanism 30, a film fixing mechanism 40, a box pressing mechanism 50, a film sucking mechanism 60 and a film cutting mechanism 70. The supporting mechanism 20 is placed on the ground and is used to support the positioning mechanism 30, the film fixing mechanism 40, the box pressing mechanism 50 and the film sucking mechanism 60.

[0069] The positioning mechanism 30 is connected to the supporting mechanism 20, and is used to cooperate with the supporting mechanism 20 to position the workpiece M, so that the workpiece M can be placed in the same position each time, and each time the workpiece M can be placed in the same position according to the positioning of the positioning mechanism 30, so that the protective film cut on the surface of each workpiece M is in the same position.

[0070] The film fixing mechanism 40 is connected to the supporting mechanism 20 and is used to fix the protective film on the surface of the workpiece M after the positioning mechanism 30 positions the workpiece M, so as to limit the protective film from moving with the workpiece M. In some specific embodiments, the film fixing mechanism 40 fixes the protective films on the two opposite surfaces of the workpiece M, so as to limit the protective film from moving with the workpiece M.

[0071] It can be understood that the positioning mechanism 30 can be omitted, and the film fixing mechanism 40 can directly clamp and fix the protective film on the surface of the workpiece M, while limiting the movement of the workpiece M in the fixing direction.

[0072] The box pressing mechanism 50 is connected to the supporting mechanism 20, and is used to apply pressure from the side of the workpiece M that is not fixed by the film fixing mechanism 40 and is not in contact with the positioning mechanism 30 or the supporting mechanism 20, that is, the side away from the ground, after the film fixing mechanism 40 fixes the protective film on the surface of the workpiece M, so that the workpiece M and the protective film are relatively displaced along the direction in which the box pressing mechanism 50 applies pressure, thereby generating a gap between the workpiece M and the protective film. In some specific embodiments, the direction in which the box pressing mechanism 50 applies force to the workpiece M is perpendicular to the ground.

[0073] It can be understood that the side of the workpiece M in contact with the positioning mechanism 30 or the supporting mechanism 20 is the placement side of the workpiece M, which is used to place the workpiece. That is, the box pressing mechanism 50 applies force to the workpiece from the fixed side of the non-protective film and the placement side of the non-workpiece M. It can be understood that in some specific embodiments, the film fixing mechanism 40 clamps the workpiece M to fix the protective films on the opposite sides of the workpiece M, and at the same time, the film fixing mechanism 40 applies force to the protective film to drive the protective film to move in a direction perpendicular to the clamping workpiece M. The box pressing mechanism 50 can be fixedly arranged at one end or both ends in the direction perpendicular to the clamping workpiece M, and when the film fixing mechanism 40 drives the protective film to move, the box pressing mechanism 50 contacts the workpiece M and the protective film to block the workpiece M from moving with the protective film. The protective film continues to move with the film fixing mechanism 40, so that a relative displacement occurs between the workpiece M and the protective film, and a gap is generated. That is, the box pressing mechanism 50 does not move, and the protective film is forced to move by the film fixing mechanism 40 to drive the protective film to move, and the box pressing mechanism 50 plays a role in limiting the workpiece M from moving with the protective film.

[0074] The film fixing mechanism 40 can drive the protective film to move in a direction perpendicular to the clamping workpiece M, and the box pressing mechanism 50 can also be set at both ends in the direction perpendicular to the clamping workpiece M. As long as it is ensured that when the film fixing mechanism 40 drives the workpiece M and the protective film to move, the box pressing mechanism 50 can limit the workpiece M to move along with the protective film, so as to create a gap between the workpiece M and the protective film.

[0075] The film suction mechanism 60 is connected to the supporting mechanism 20 and is used to absorb and fix the protective film at the gap after a gap is generated between the workpiece M and the protective film, so as to increase the gap distance between the protective film and the workpiece M and keep the protective film flat at the absorbed and fixed position.

[0076] The film cutting mechanism 70 is connected to the film suction mechanism 60 and is used to cut the protective film at the gap, so that the cut of the protective film is smooth and does not cause damage to the workpiece M to which the protective film is attached, thereby improving the cut processing yield.

[0077] It is understandable that the film suction mechanism 60 can be omitted, and the film cutting mechanism 70 can be directly connected to the supporting mechanism 20, and after the box pressing mechanism 50 creates a gap between the workpiece M and the protective film, the protective film at the gap can be cut. Because the protective film at the gap is cut, the workpiece M to which the protective film is attached will not be damaged.

[0078] It can be understood that the positioning mechanism 30, the film fixing mechanism 40, the box pressing mechanism 50 and the film sucking mechanism 60 can all form a detachable connection with the supporting mechanism 20 through threads, and can also form a non-detachable connection through welding and other methods, as long as the positioning mechanism 30, the film fixing mechanism 40, the box pressing mechanism 50 and the film sucking mechanism 60 are relatively fixed with the supporting mechanism 20.

[0079] It can be understood that the support mechanism 20 can be omitted, and the positioning mechanism 30, the film fixing mechanism 40, the box pressing mechanism 50 and the film sucking mechanism 60 can be placed on the ground, and the film cutting mechanism 70 is connected to the film sucking mechanism 60, or a pad is used to replace the support mechanism 20, as long as the relative positions of the positioning mechanism 30, the film fixing mechanism 40, the box pressing mechanism 50, the film sucking mechanism 60 and the film cutting mechanism 70 are guaranteed. It can also be understood that when the positioning mechanism 30 and the support mechanism 20 are omitted, the workpiece M can be clamped and positioned by the film fixing mechanism 40. The box pressing mechanism 50 is arranged at one end or both ends perpendicular to the clamping direction, and cooperates with the film fixing mechanism 40 to generate a gap between the workpiece M and the protective film. The film sucking mechanism 60 and the film cutting mechanism 70 are arranged at one end where the gap is generated, and the film sucking mechanism 60 absorbs the protective film that generates a gap with the workpiece M, and the film cutting mechanism 70 cuts the protective film that generates the gap.

[0080] See also Figure 2A-2B In this embodiment, the workpiece M is a square packaging box, and the protective film completely covers the surface of the packaging box. In other embodiments, the workpiece M can also be a packaging box for electronic products, food, tobacco, clothing, shoes, cosmetics or medical supplies, and the packaging box can also be round or other shapes, as long as the protective film completely covers the packaging box.

[0081] See also Figure 3A-3B The positioning mechanism 30 includes a substrate 301, a limit block 303 and a connecting member 305. The connecting member 305 connects the substrate 301 and the supporting mechanism 20. The substrate 301 is a rectangular flat plate. The limit blocks 303 are arranged around the three sides of the substrate 301 to form a limit structure, and the limit structure is adapted to the size of the workpiece M. When the workpiece M is placed into the limit structure from the side where the limit block 303 is not set, the limit block 303 and the substrate 301 cooperate to jointly limit the displacement of the workpiece M relative to the substrate 301 in the direction of the limit block 303. At the same time, each time the workpiece M is replaced, the positioning mechanism 30 can be used to place the workpiece M that needs to be cut with the protective film this time at the same position as the workpiece M that was cut with the protective film last time, so as to ensure that the protective film cut of each workpiece M is in the same position.

[0082] It is understood that the limit blocks 303 can be arranged around three sides of the substrate 301. It is also understood that the limit blocks 303 can be arranged to be movable relative to the substrate 301 to adjust the distance between the relative limit blocks 303, so as to adapt to workpieces M of different sizes.

[0083] It can be understood that the role of the limit block 303 is to limit the movement of the workpiece M on the substrate 301, and it is not necessary to completely contact and buckle the workpiece M or apply force to the workpiece M to avoid breaking the protective film. Generally speaking, it is appropriate for the limit block 303 to just contact the protective film on the surface of the workpiece M but not apply force to it, which also facilitates the subsequent displacement between the protective film and the workpiece M.

[0084] It can also be understood that the height of the limit block 303 is preferably not higher than 1 / 2 of the height of the workpiece M, and preferably not higher than 1 / 4 of the height of the workpiece M, so as to leave the best operating space for the subsequent film fixing mechanism 40.

[0085] In some embodiments, the connecting member 305 is an elastic member, which can be a spring or a spring sheet, so that the positioning mechanism 30 can be displaced in the vertical direction relative to the supporting mechanism 20, so that when the pressing box mechanism 50 applies pressure to the workpiece M, the positioning mechanism 30 can be displaced in the direction of the supporting mechanism 20, and the workpiece M also moves with the positioning mechanism 30. The protective film is fixed and does not move with the workpiece M, thereby ensuring that there is a sufficient gap between the workpiece and the protective film to prevent the film cutting mechanism 70 from accidentally damaging the workpiece when cutting the protective film.

[0086] It can be understood that the base plate 301 and the limit block 303 can be integrally formed or fixedly connected by welding, and directly set to match the size of the workpiece M. It can also be detachably connected by thread, and multiple threaded holes are set on the base plate 301. When the size of the workpiece M changes, the threaded hole that matches the size of the workpiece M is selected to connect the limit block 303. It is sufficient as long as the limit block 303 and the base plate 301 can cooperate to jointly limit the displacement of the workpiece M relative to the base plate 301.

[0087] See also Figure 4A The film fixing mechanism 40 includes a first film fixing component 41 and a second film fixing component 42. The first film fixing component 41 and the second film fixing component 42 are arranged on opposite sides of the workpiece M to be cut. The workpiece M is clamped by the first film fixing component 41 and the second film fixing component 42 to fix the protective films on opposite sides of the surface of the workpiece M. It can be understood that the first film fixing component 41 and the second film fixing component 42 need to apply force to the opposite sides of the protective film in a balanced manner to avoid uneven force on the protective film, that is, some parts of the protective film are not fixed by the film fixing mechanism 40, so that when the protective film is pressed by the pressing box mechanism 50, the unfixed protective film will not be displaced together with the workpiece M due to uneven force.

[0088] It can be understood that the first film fixing component 41 and the second film fixing component 42 are arranged at relative positions on opposite sides of the workpiece M and symmetrically apply force at the same time, which can more effectively fix the protective film and effectively prevent the protective film from shifting with the workpiece M when pressure is applied by the pressing box mechanism 50.

[0089] It can be understood that the clamping force applied to the workpiece M by the first film fixing assembly 41 and the second film fixing assembly 42 cannot damage the appearance of the workpiece M.

[0090] It can be understood that the position where the film fixing mechanism 40 contacts the protective film is staggered from the position where the positioning mechanism 30 contacts the protective film, and no interference occurs.

[0091] The first film fixing assembly 41 and the second film fixing assembly 42 have the same shape, structure and function, and are both connected to the support mechanism 20. The first film fixing assembly 41 and the second film fixing assembly 42 clamp the workpiece M and contact with the protective film wrapped on the surface of the workpiece M to better fix the protective film and ensure that when the box pressing mechanism 50 applies force to the workpiece M, the protective film and the workpiece M are relatively displaced in the direction of the force applied by the box pressing mechanism 50, thereby generating a gap.

[0092] It can be understood that the first film fixing component 41 and the second film fixing component 42 have the same shape, structure and function, that is, the positions of the first film fixing component 41 and the second film fixing component 42 can be interchanged, as long as the protective films on the opposite sides of the surface of the workpiece M are clamped and fixed by the first film fixing component 41 and the second film fixing component 42.

[0093] See also Figure 4B-4E The first film fixing assembly 41 includes a first adhesive roll device 401 and a first support assembly 403. The first adhesive roll device 401 is rotatably connected to the first support assembly 403, and the first adhesive roll device 401 can rotate around the first support assembly 403. The first adhesive roll device 401 includes a first fixed frame 4011, a first roller 4016, a first material receiving shaft 4012, a first rotating shaft 4015, and a first adhesive tape roll 4014. The first adhesive tape roll 4014 is connected to the first fixed frame 4011 and is used to provide adhesive tape. The adhesive tape on the first adhesive tape roll 4014 passes around the first roller 4016 and is wound around the first material receiving shaft 4012 to adhere and fix the protective film of the workpiece M. The first rotating shaft 4015 is connected to the first fixed frame 4011. The first fixed frame 4011 is rotatably matched with the first support assembly 403 through the first rotating shaft 4015, so that the first fixed frame 4011 can rotate around the first support assembly 403. The first material receiving shaft 4012 is connected to the first fixed frame 4011, and is used to reel in the adhesive tape on the first adhesive tape roll 4014. The axial direction of the first material receiving shaft 4012 is parallel to the axial direction of the first adhesive tape roll 4014. The first roller 4016 is disposed on the first fixed frame 4011, and is used to tension the adhesive tape that is passed by the first adhesive tape roll 4014. At the same time, when the first material receiving shaft 4012 is reeling in the adhesive tape, the first roller 4016 rotates around its own axial direction to drive the adhesive tape, so as to facilitate the reeling of the adhesive tape.

[0094] Furthermore, the first tape roll 4014 is a circular cylinder with tape wrapped around the periphery, the tape has a sticky side facing the protective film to be adhered, and the first tape roll 4014 can rotate relative to the first fixed frame 4011. When the first material receiving shaft 4012 is driven to rotate by manpower or a motor, the tape on the first tape roll 4014 can be taken up by the first material receiving shaft 4012.

[0095] When the first tape roll 4014 is installed, the tape can be pulled out from the first tape roll 4014, passed around the first roller 4016 set on the first fixed frame 4011, and wound around the first material collection shaft 4012. When the first material collection shaft 4012 pulls the first tape roll 4014 to rotate, the tape is rolled up on the first material collection shaft 4012.

[0096] See also Figure 4F The first support assembly 403 includes a first cylinder 4031, a first base 4035 and a first rotating hole 4037, and the first base 4035 is connected to the support mechanism 20. The first rotating hole 4037 is arranged on the first base 4035, and is rotatably matched with the first rotating shaft 4015, so that the first fixing frame 4011 can rotate relative to the first base 4035, that is, the first adhesive roll device 401 and the first support assembly 403 realize relative rotation through the rotational match of the first rotating shaft 4015 and the first rotating hole 4037. The first cylinder 4031 is rotatably connected to the first base 4035 and the first fixing frame 4011 respectively. When the first cylinder 4031 is working, it can push the first fixing frame 4011 to rotate relative to the first base 4035. When the first cylinder 4031 is working, it pushes the first adhesive rolling device 401 to rotate around the first support assembly 403, that is, the first film fixing assembly 41 moves in the first direction to cooperate with the second film fixing assembly 42 to clamp and position the protective films wrapped on opposite sides of the workpiece M.

[0097] See also Figures 5A-5C The second film fixing assembly 42 includes a second adhesive roll device 405 and a second support assembly 407. The second adhesive roll device 405 is rotatably connected to the second support assembly 407, and the second adhesive roll device 405 can rotate around the second support assembly 407. The second adhesive roll device 405 includes a second adhesive tape roll 4054, a second fixed frame 4051, a second roller 4056, a second material receiving shaft 4052 and a second rotating shaft 4055. The second fixed frame 4051 is rotatably matched with the second support assembly 407 through the second rotating shaft 4055. The second material receiving shaft 4052 is used to reel in the adhesive tape roll. The second roller 4056 is disposed on the second fixed frame 4051 and is used to tighten the second adhesive tape roll 4054. At the same time, the second material receiving shaft 4052 drives the adhesive tape when the adhesive tape is reeled in, so as to facilitate the reeling of the adhesive tape.

[0098] See also Figure 5D-5EThe second support assembly 407 includes a second cylinder 4071, a second base 4075 and a second rotating hole 4077, and the second base 4075 is connected to the support mechanism 20. The second rotating hole 4077 is arranged on the second base 4075, and is rotatably matched with the second rotating shaft 4055, so that the second fixing frame 4051 can rotate relative to the second base 4075, that is, the second adhesive roll device 405 and the second support assembly 407 realize relative rotation through the rotational match of the second rotating shaft 4055 and the second rotating hole 4077. The second cylinder 4071 is rotatably connected to the second base 4075 and the second fixing frame 4051 respectively. When the second cylinder 4071 is working, it can push the second fixing frame 4051 to rotate relative to the second base 4075, and the second adhesive roll device 405 rotates around the second support assembly 407, that is, the second film fixing assembly 42 moves in the second direction. The first film fixing assembly 41 cooperates with the second film fixing assembly 42 to clamp and position the protective films wrapped on opposite sides of the workpiece.

[0099] Specifically, after the workpiece M is fed into the positioning mechanism 30, the first cylinder 4031 pushes the first adhesive roll device 401 to adhere the adhesive tape on the first adhesive tape roll 4014 to the protective film on one side of the workpiece. The second cylinder 4071 pushes the second adhesive roll device 405 to adhere the adhesive tape on the second adhesive tape roll 4054 to the protective film on the other side of the workpiece, so that the protective film of the workpiece M is clamped by the first film fixing assembly 41 and the second film fixing assembly 42. The adhesive tapes of the first adhesive tape roll 4014 and the second adhesive tape roll 4054 are in contact with the protective film surfaces on the opposite sides of the workpiece M to ensure the adhesion effect.

[0100] It can be understood that in this embodiment, after the first film fixing assembly 41 and the second film fixing assembly 42 clamp the protective films on the opposite sides of the workpiece M, the protective films at the clamped locations are adhered by the adhesiveness of the tape to fix the protective films at the adhered locations. Since the tape is in surface contact with the protective film, that is, every point on the protective film in contact with the tape is fixed, when the workpiece M is subjected to force by the box pressing mechanism 50, wrinkles will not occur at the fixed locations.

[0101] In other embodiments, the adhesive tape fixation can be replaced with suction cup fixation or vacuum fixation, that is, by installing a suction cup or a vacuum adsorption hole connected to an external air source on the side of the first fixing frame 4011 facing the workpiece M, and installing a suction cup or a vacuum adsorption hole connected to an external air source on the side of the second fixing frame 4051 facing the workpiece M, after the first film fixing assembly 41 and the second film fixing assembly 42 clamp the protective film on the opposite sides of the workpiece M, the protective film at the clamped position is adsorbed by the suction cup or the vacuum adsorption hole to fix the protective film at the adsorbed position. As long as the protective films on the opposite sides of the surface of the workpiece M can be fixed, when the box pressing mechanism 50 applies force to the workpiece M, a gap can be generated between the workpiece M and the protective film in the force application direction.

[0102] It can be understood that the first cylinder 4031 and the second cylinder 4071 can push the corresponding adhesive rolling device simultaneously or separately, so that the adhesive tape adheres to the protective films on the opposite sides of the workpiece M.

[0103] After the adhesive tape completes the adhesion action on a workpiece, the first material receiving shaft 4012 and the second material receiving shaft 4052 rotate to reel in the used adhesive tape to prevent the used adhesive tape from affecting the adhesion effect of the next workpiece.

[0104] See also Figures 6A-6D The box pressing mechanism 50 includes a fixed guide rod 501, a box pressing cylinder 502, a pressing block 503 and a support frame 504. The fixed guide rod 501 is connected to the support mechanism 20, the box pressing cylinder 502 is connected to the support frame 504, and the support frame 504 is connected to the fixed guide rod 501. The position of the support frame 504 on the fixed guide rod 501 relative to the workpiece M can be adjusted, that is, the position of the box pressing cylinder 502 relative to the workpiece M can be adjusted. The pressing block 503 is fixedly connected to the box pressing cylinder 502, and can move relative to the workpiece M along the working direction of the box pressing cylinder 502 as the box pressing cylinder 502 works.

[0105] It can be understood that in this embodiment, the fixed guide rod 501 is perpendicular to the ground, and the position of the press box cylinder 502 relative to the workpiece M in the direction perpendicular to the ground can be adjusted by adjusting the position of the support frame 504 on the fixed guide rod 501, and then the press block 503 is driven by the press box cylinder 502 to apply force to the side of the workpiece M away from the ground from the direction perpendicular to the ground. In other embodiments, the direction of the force applied by the press block 503 to the workpiece M can be adjusted by adjusting the direction of the fixed guide rod 501, as long as the direction of the force application is not the opposite sides of the workpiece M that are fixed and the side that contacts the positioning mechanism 30 or the support mechanism 20.

[0106] Specifically, after the film fixing mechanism 40 fixes the protective film wrapped around the workpiece M, the box pressing cylinder 502 starts to work, and the pressing block 503 presses down the workpiece M. Under the action of the force, the workpiece M is displaced in the direction of the force. Since the protective film is fixed by the film fixing mechanism 40 on both sides of the workpiece M symmetrically, the part not pressed by the pressing block 503 will not move along the direction of the force with the workpiece M, that is, the protective film not pressed by the pressing block 503 will be fixed at the initial position by the film fixing mechanism 40, and the part of the protective film pressed by the pressing block 503 will move down with the pressing block 503, resulting in a region H where the workpiece M and the protective film do not contact each other in the distance from one side of the workpiece M to the pressing block 503, that is, the gap between the workpiece M and the protective film. In addition, the film fixing mechanism 40 fixes the protective film, which can ensure that the protective film will not have wrinkles when it is pressed down by the box pressing mechanism 50, and the overall appearance of the protective film is well protected.

[0107] It can be understood that in this embodiment, the displacement of the workpiece M after the pressure is applied by the pressing block 503 is because the workpiece M is placed on the positioning mechanism 30, and the connecting member 305 connecting the positioning mechanism 30 and the supporting mechanism 20 is an elastic member, that is, the displacement of the workpiece M after the pressure is applied is actually achieved through the elastic contraction of the connecting member 305. In other embodiments, the positioning mechanism 30 is omitted, and after the pressing block 503 applies pressure to the workpiece M, the workpiece M is plastically deformed by its own force, thereby generating a gap with the protective film.

[0108] See also Figure 6E-6F In other embodiments, the film fixing mechanism 40 can also be connected to an external cylinder or other driving member, so that the first film fixing assembly 41 and the second film fixing assembly 42 can move in a direction perpendicular to the clamped workpiece M, that is, in a direction parallel to the fixed side of the protective film. The pressing box mechanism 50 is arranged on the moving path of the first film fixing assembly 41 and the second film fixing assembly 42 to limit the workpiece M from moving along with the protective film. The pressing box mechanism 50 cooperates with the film fixing mechanism 40 to create a gap between the workpiece M and the protective film.

[0109] Specifically, after the first film fixing component 41 and the second film fixing component 42 clamp the workpiece M from opposite sides of the workpiece M and fix the protective film, they apply force to the protective film and start to drive the workpiece M and the protective film to move simultaneously in a direction perpendicular to the clamping workpiece M. The moving direction can move in any direction perpendicular to the clamping direction of the workpiece M. Correspondingly, the pressing box mechanism 50 is arranged in the corresponding moving directions of the first film fixing component 41 and the second film fixing component 42. When the workpiece M and the protective film move to contact with the pressing box mechanism 50, the pressing box mechanism 50 limits the displacement of the workpiece M, but since the protective film is a soft material, it still moves under the drive of the first film fixing component 41 and the second film fixing component 42, so a gap is generated between the workpiece M and the protective film.

[0110] It can be understood that after the film fixing mechanism 40 fixes the protective film, the box pressing mechanism 50 can apply force to the workpiece M, that is, the box pressing mechanism 50 presses the workpiece M to move, and the protective film does not move under the fixation of the film fixing mechanism 40, so that the workpiece M and the protective film are relatively moved, thereby generating a gap. Alternatively, the film fixing mechanism 40 applies force to the protective film, that is, the film fixing mechanism 40 uses the adhesion of the tape, the suction of the suction cup or vacuum adsorption, or other forces, plus its own clamping force, so that the protective film and the workpiece M can move together with the film fixing mechanism 40. At the same time, the box pressing mechanism 50 does not move, and blocks the moving direction of the film fixing mechanism 40, so that the workpiece M cannot move, so that the workpiece M and the protective film are relatively moved, thereby generating a gap. The box pressing mechanism 50 can also apply force to the workpiece M, press the workpiece M to move, and at the same time, the film fixing mechanism applies force to the protective film, driving the workpiece M and the protective film to move in the opposite direction to the force applied by the box pressing mechanism 50, so that the workpiece M and the protective film are relatively displaced, and then a gap is generated. That is, whether the film fixing mechanism 40 is used to apply force to the protective film, or the box pressing mechanism 50 is used to apply force to the workpiece M, or the box pressing mechanism 50 applies force to the workpiece M while the film fixing mechanism also applies force to the protective film, the box pressing mechanism 50 cooperates with the film fixing mechanism 40 to cause a relative displacement between the workpiece M and the protective film, thereby generating a gap between the workpiece M and the protective film, making it convenient to cut the protective film.

[0111] It can be understood that the larger the contact area between the tape, suction cup or vacuum adsorption hole and the protective film, the better the fixing effect. When the subsequent box pressing mechanism 50 applies force to the workpiece M or the first film fixing component 41 and the second film fixing component 42 apply force to the protective film, the protective film is adhered and fixed more stably, which is also more conducive to the creation of a gap between the workpiece M and the protective film, and it is more convenient for the film cutting mechanism 70 to perform film cutting.

[0112] See also Figures 7A-7D The film suction mechanism 60 includes a fixed column 601, a film suction support frame 602, a film suction cylinder 603 and a suction cup assembly 604. The fixed column 601 is connected to the support mechanism 20, and the film suction support frame 602 is connected to the fixed column 601, and the position of the film suction support frame 602 on the fixed column 601 relative to the workpiece M can be adjusted. The film suction cylinder 603 is connected to the film suction support frame 602, and preferably, the film suction cylinder 603 and the film suction support frame 602 can be movably positioned and connected. The suction cup assembly 604 is connected to the film suction cylinder 603.

[0113] Specifically, the suction cup assembly 604 includes a suction cup 6041 and a suction cup fixing part 6042, the suction cup fixing part 6042 is connected to the film suction cylinder 603, the suction cups 6041 are arranged in rows on the side of the suction cup fixing part 6042 close to the workpiece, and each suction cup 6041 protrudes from the suction cup fixing part 6042 by the same distance, and there is no height difference between them, that is, the suction cup 6041 is a plane on one side of the adsorbing protective film, so as to adsorb and flatten the protective film on the surface of the workpiece M. Preferably, the suction cups 6041 are arranged in multiple rows.

[0114] Furthermore, a through hole 6043 is provided on the suction cup fixing member 6042, and the suction cups 6041 are distributed on two opposite sides, three sides or four sides of the through hole 6043. The film cutting mechanism 70 cuts the protective film of the workpiece through the through hole 6043.

[0115] Please refer to 7E. After a gap is generated between the protective film and the workpiece M, since the pressing block 503 only presses a part of the workpiece M, there will be a height difference between the protective film not pressed by the pressing block 503 and the protective film pressed by the pressing block 503, that is, the generated gap is inclined. The film suction cylinder 603 works, and the suction cup assembly 604 moves to the protective film, and the protective film at the gap with the workpiece M is sucked on the suction cup assembly 604, and the film cutting mechanism 70 cuts the sucked protective film through the perforation 6043.

[0116] It can be understood that in this embodiment, the pressing block 503 applies pressure to the middle end of the workpiece M, and the suction cup assembly 604 absorbs the pressing block 503 to the protective film on one side of the workpiece M. In other embodiments, the pressing block 503 can apply pressure to any part of the side of the workpiece M where the force is applied, and the suction cup assembly 604 absorbs the protective film at the gap generated after the pressing block 503 applies force, and the film cutting mechanism 70 cuts the absorbed protective film. As long as the pressing block 503 applies force to the workpiece M to generate a gap between the workpiece M and the protective film, and the suction cup assembly 604 absorbs the protective film at the gap generated, the film cutting mechanism 70 can cut the absorbed protective film.

[0117] It can also be understood that in some embodiments, the film suction mechanism 60 is omitted, and the film cutting mechanism 70 can be directly connected to the supporting mechanism 20, and after the box pressing mechanism 50 creates a gap between the workpiece M and the protective film, the protective film at the gap can be directly cut.

[0118] See also Figures 8A-8BThe film cutting mechanism 70 includes a film cutting support frame 701, a cutter 703 and a film cutting cylinder 705. The film cutting mechanism 70 can follow the working movement of the film cutting cylinder 705. The film cutting support frame 701 is connected to the film suction support frame 602, and can follow the film suction support frame 602 to move on the fixed column 601. The film cutting cylinder 705 is connected to the film cutting support frame 701 to control the cutter 703 to cut the film through the perforation 6043. After the suction cup assembly 604 absorbs the protective film, the film cutting cylinder 705 works to drive the cutter 703 to move in the direction of the workpiece M to cut the protective film at the gap. Since there is a gap between the workpiece M and the protective film, and the protective film is sucked and flattened by the suction cup assembly 604, when the cutter 703 cuts the protective film, the width of the cut can be cut to the width of the workpiece M.

[0119] It can be understood that the protective film is usually cut to facilitate tearing off during later unpacking, and the width of the cut is close to the width of the workpiece M. When tearing off, the protective film can be torn off at one time without the protective film breaking when torn halfway. At the same time, since the protective film needs to be attached to the surface of the workpiece M before tearing off, the width of the cut will not be cut to be exactly the same as the workpiece M. The best width is 1mm-2mm less than the width of the workpiece M.

[0120] By using the film fixing mechanism 40 and the box pressing mechanism 50 to create a gap between the protective film and the workpiece M, and then using the film suction mechanism 60 to suck and flatten the protective film at the gap, the incision width can be cut to an optimal incision width of 1mm-2mm less than the width of the workpiece M. At the same time, the incision can also be set to a U-shape, that is, in addition to cutting a width incision on the protective film at the gap, the tool 703 also cuts two straight lines on both sides of the width incision in a direction perpendicular to the width direction, making it easier to tear off the protective film. In other embodiments, the film suction mechanism 60 is omitted, and the protective film at the gap is directly incised, as long as it can be torn off during later disassembly.

[0121] See also Fig. 9 The present invention also provides a protective film cutting method, which comprises the following steps:

[0122] Step S1: fix the protective film to limit the protective film from moving with the workpiece;

[0123] Specifically, the two opposite sides of the workpiece are clamped, and then the protective films on the two opposite sides of the workpiece are fixed by adhesive tape adhesion or suction cups, vacuum adsorption, etc., so as to limit the protective films from moving with the workpiece. Preferably, adhesive tape is used for adhesion and fixing, so that the fixed protective films do not produce wrinkles when subjected to force.

[0124] Step S2: applying force to the workpiece or the protective film to create a gap between the workpiece and the protective film;

[0125] Specifically, after the two opposite sides of the protective film are fixed, force is applied to the workpiece from a direction in which it is not fixed, or force is applied to the protective film from a direction parallel to the fixed direction, so that the workpiece or the protective film is displaced in the force direction, so that the workpiece and the protective film are relatively displaced, thereby creating a gap between the workpiece and the protective film.

[0126] Step S3: cutting the protective film at the gap.

[0127] Specifically, the protective film at the gap between the protective film and the workpiece is cut so that there is a tearing opening on the protective film, so that when the protective film needs to be removed, it can be directly torn open using the tearing opening.

[0128] Furthermore, the method may further include step S11 before step S1: positioning the workpiece;

[0129] Specifically, the position of the workpiece is fixed, that is, the workpiece is placed at the same position each time using a positioning piece, and then the protective film is fixed from two symmetrical sides.

[0130] The method may further include step S21 before step S3: adsorbing and leveling the protective film at the gap;

[0131] Specifically, after applying force to the workpiece, a gap is created between the protective film that is not pressed and the workpiece, but because the pressed position is under pressure and the unpressed position is fixed, a height difference is created between the pressed position and the unpressed position, so the protective film is in an inclined state. The protective film in an inclined state is adsorbed by a suction cup, so that the adsorbed part of the protective film becomes flat, and then the protective film in the flat position is cut.

[0132] Compared with the prior art, the protective film cutting device and method provided by the present invention have the following advantages:

[0133] 1. The protective film covering the surface of the workpiece is fixed by a film fixing mechanism to restrict the movement of the workpiece so that the protective film moves with it. Then, the box pressing mechanism or the film fixing mechanism is used to cooperate. After the protective film is fixed by the film fixing mechanism, the workpiece and the protective film covering the surface of the workpiece are displaced relative to each other, thereby generating a gap between the workpiece and the protective film, and then cutting the protective film at the gap. Due to the existence of the gap, the workpiece will not be damaged during cutting.

[0134] 2. The protective film covering the surface of the workpiece is fixed from opposite sides of the workpiece by the cooperation of the first film fixing assembly and the second film fixing assembly, so that the protective film will not be wrinkled when relative displacement occurs between the workpiece and the protective film.

[0135] 3. The first film fixing assembly and the second film fixing assembly fix the protective film wrapped on the surface of the workpiece by adhesive tape, so that the protective film is more evenly stressed and is more likely to have a gap with the workpiece when subjected to a force in a third direction. The film fixing mechanism adopts the adhesive tape bonding method, so that the protective film is fixed in a larger range, thus preventing wrinkles.

[0136] 4. Use the positioning mechanism to position the workpiece, and then use the film fixing mechanism to fix each workpiece after it is positioned by the positioning mechanism, so that the workpiece can be placed in the same position each time, so that the film fixing mechanism can fix the protective film in the same place each time.

[0137] 5. The positioning mechanism is connected to the supporting mechanism through an elastic member, so that when the workpiece is subjected to the force of the box pressing mechanism, it can retract, thereby creating a gap between the workpiece and the protective film.

[0138] 6. Use the film suction mechanism to cooperate with the film fixing mechanism and the box pressing mechanism to make the inclined gap between the workpiece and the protective film covering the surface of the workpiece be adsorbed and leveled, so that when the film cutting mechanism cuts the protective film from the gap, the protective film on the surface of the workpiece can be cut to 1mm-2mm less than the width of the workpiece, making it easier to tear off.

[0139] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A protective film cutting device for cutting a protective film coated on a workpiece, characterized in that: The protective film cutting device comprises a film fixing mechanism, a box pressing mechanism, a film sucking mechanism and a film cutting mechanism; The film fixing mechanism fixes the protective film on the surface of the workpiece, the box pressing mechanism is fixedly arranged at one end or both ends in the direction of vertically clamping the workpiece, the box pressing mechanism applies force to the workpiece from the non-protective film fixed side and / or the film fixing mechanism applies force to the protective film in a direction parallel to the protective film fixed side, so that the workpiece is displaced relative to the protective film, so that a gap is generated between the workpiece and the protective film; The film suction mechanism includes a suction cup assembly and a film suction cylinder, the suction cup assembly is connected to the film suction cylinder, the suction cup assembly includes a suction cup and a suction cup fixing part, the suction cup fixing part is connected to the film suction cylinder, and the suction cups are arranged in a row on a side of the suction cup fixing part close to the workpiece to absorb the protective film at the gap between the workpieces; The suction cup fixing member is provided with a perforation, and the suction cups are distributed on two opposite sides, three sides or four sides of the perforation; The film cutting mechanism cuts the protective film at the gap through the perforation.

2. A protective film cutting device as claimed in claim 1, characterized in that: The film fixing mechanism comprises a first film fixing component and a second film fixing component, which are respectively arranged on opposite sides of the workpiece, and the first film fixing component and the second film fixing component cooperate with each other to fix the protective films on opposite sides of the workpiece surface.

3. A protective film cutting device as claimed in claim 2, characterized in that: The first film fixing assembly includes a first adhesive roll device and a first support assembly, the first adhesive roll device is rotatably connected to the first support assembly, and the first adhesive roll device can rotate around the first support assembly; The second film fixing assembly includes a second adhesive rolling device and a second support assembly. The second adhesive rolling device is rotatably connected to the second support assembly, and the second adhesive rolling device can rotate around the second support assembly.

4. A protective film cutting device as claimed in claim 3, characterized in that: The first adhesive tape rolling device comprises a first fixed frame, a first material receiving shaft, a first rotating shaft and a first adhesive tape roll; the first adhesive tape roll provides an adhesive tape, the adhesive tape is wound around the first material receiving shaft and the adhesive surface of the adhesive tape is attached to the protective film; the first material receiving shaft reels the adhesive tape attached to the protective film; the first rotating shaft is rotatably matched with the first support assembly so that the first fixed frame rotates around the first support assembly; The second tape rolling device includes a second fixed frame, a second material receiving shaft, a second rotating shaft and a second tape roll; the second tape roll provides tape, which is wound around the second material receiving shaft and adheres to a protective film with the adhesive surface of the tape; the second material receiving shaft rewinds the tape adhered to the protective film; the second rotating shaft rotates in cooperation with the first support assembly to allow the second fixed frame to rotate around the second support assembly.

5. A protective film cutting device as claimed in claim 4, characterized in that: The first support assembly includes a first base and a first rotation hole, wherein the first rotation hole is disposed on the first base and is rotationally matched with the first rotation axis so that the first base can rotate relative to the first fixing frame; The second support assembly includes a second base and a second rotating hole. The second rotating hole is arranged on the second base and is rotationally matched with the second rotating shaft so that the second base can rotate relative to the second fixing frame.

6. A protective film cutting device according to any one of claims 1 to 5, characterized in that: The box pressing mechanism also includes a fixed guide rod, a box pressing cylinder, a pressing block and a support frame; the support frame is connected to the fixed guide rod, and the position of the support frame relative to the workpiece can be adjusted on the fixed guide rod; the box pressing cylinder is connected to the support frame and to the pressing block, and can drive the pressing block to move during operation.

7. A protective film cutting device according to any one of claims 1 to 5, characterized in that: The film suction mechanism also includes a fixed column and a film suction support frame; the film suction support frame is connected to the fixed column, and the position of the film suction support frame on the fixed column relative to the workpiece can be adjusted; the film suction cylinder is connected to the film suction support frame.

8. A protective film cutting device according to any one of claims 1 to 5, characterized in that: The protective film cutting device also includes a positioning mechanism, which includes a base plate and a limiting block; the limiting block is arranged around three sides of the base plate to form a limiting structure to limit the displacement of the workpiece relative to the base plate.

9. A protective film cutting device as claimed in claim 8, characterized in that: The positioning mechanism also includes a connecting member, which is connected to the substrate and is an elastic member so that when the workpiece is pressed by the box pressing mechanism, it can be displaced, thereby generating a sufficient gap between the workpiece and the protective film.

10. A protective film cutting method, using the protective film cutting device according to any one of claims 1 to 9, characterized in that: The method includes, Fix the protective films on opposite sides of the workpiece; apply force to the workpiece from a direction that is not fixed, or apply force to the protective film from a direction parallel to the fixed direction, so that the workpiece or the protective film is displaced in the force application direction, thereby generating a gap between the workpiece and the protective film; Adsorb the protective film flat; Cut the protective film at the gap.

11. A protective film cutting method according to claim 10, characterized in that: The method further includes positioning the workpiece before the protective film is fixed on the surface of the workpiece.

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