Method for automatically pasting protective film on product

Abstract

The invention relates to the technical field of product film pasting, and discloses a method for automatically pasting a protective film on a product, and the method is characterized in that automatic film pasting operation of eight injection molding products is realized through cooperation of a dislocation mechanism, a conveying mechanism, a coil feeder feeding and stripping device, a film suction mechanism, a pressure maintaining mechanism and a controller which are arranged on a rack; the method comprises the core steps of protective film roll material installation and tension adjustment, product taking and placing and grouping positioning, protective film stripping in two groups and precise attaching, pressure maintaining treatment and reset discharging. The automatic film pasting device solves the problems that existing manual film pasting is low in efficiency, inconsistent in position, prone to missing pasting and infirm in film pasting, has the advantages of being high in automation degree, accurate in film pasting, reliable in product protection effect and the like, the efficiency is matched with the production rhythm of an injection molding machine, and is suitable for efficient film pasting operation of batch injection molding products.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of product film pasting, in particular to a product automatic protective film pasting method. BACKGROUND

[0002] In the production process of injection molded products, after the products are injection molded by an injection molding machine, the product surface needs to be pasted with a film to achieve dustproof protection.

[0003] In the prior art, the film pasting process mainly relies on manual operation: the operator manually tears open the protective film and then pastes it one by one onto the product surface. However, since an injection molding machine can produce 8 products in a single injection (one batch), manual film pasting has the following significant defects: manual single film pasting requires the operator to operate and convey the 8 products one by one, which is tedious and cannot match the production rhythm of the injection molding machine, resulting in a production bottleneck; manual operation is easily affected by subjective factors, and the film pasting position of each product is inconsistent, which may cause problems such as deviation and wrinkling, seriously affecting the appearance quality of the product; the operator is prone to fatigue after a long time of work, which may result in missed pasting of the protective film or insecure pasting of the film, leading to ineffective protection of the product. SUMMARY

[0004] The present application aims to provide a product automatic protective film pasting method to solve the problems of low efficiency, inconsistent position, and easy missed pasting of the film in the prior art.

[0005] The present application is a product automatic protective film pasting method, which includes a rack, the rack is provided with a misalignment mechanism, a conveying mechanism, a roll material feeder stripping device, a film suction mechanism, a pressure maintaining mechanism, and a controller; the misalignment mechanism, the conveying mechanism, the roll material feeder stripping device, the film suction mechanism, and the pressure maintaining mechanism are respectively electrically connected with the controller; The method further includes the following steps: S1: Install an entire roll of protective film onto the unwinding roller of the roll material feeder stripping device, and adjust the tension adjusting roller to keep the protective film in a tensioned state; S2: Product picking and placing, pick 8 molded products from the mold of the injection molding machine by a picking jig, and place the products on the misalignment mechanism; the product positioning protrusions of the misalignment mechanism cooperate with the positioning holes of the products to achieve preliminary positioning; the end side pushing cylinders of the misalignment mechanism are started to move the products, so that the positions of 4 products are accurately aligned with the positions of the subsequent 4 protective films to be stripped; S3: The conveying mechanism moves the misalignment mechanism to the protective film pasting position; the first group of protective films is stripped, the roll material feeder stripping device pulls the protective film forward by a preset distance, and then the film suction mechanism cooperates with the roll material feeder stripping device to strip the 4 protective films from the roll material; S4: The first group of film is pasted, the film suction mechanism is started, 4 protective films peeled off in step S3 are adsorbed and precisely pasted to the 4 product surfaces aligned side by side on the misplacement mechanism; S5: The second group of protective films is peeled off, the roll material feeder peeling device repeats the action of step S3 to peel off 4 protective films again; S6: The second group of products is positioned, the bottom translation cylinder of the misplacement mechanism is started to move the remaining 4 products without pasting film to the position of pasting protective film, so that they are precisely aligned with the position of the 4 protective films peeled off in step S5; S7: The second group of film is pasted, the film suction mechanism repeats the action of step S4 to adsorb the 4 protective films peeled off in step S5 and precisely paste them to the surfaces of the remaining 4 products; S8: The pressure maintaining position is transmitted, the conveying mechanism moves the 8 products with pasted film to the pressure maintaining position, and the pressure maintaining mechanism is started to perform the pressure maintaining treatment of the products with pasted film for a preset time; S9: Resetting and discharging, the conveying mechanism drives the misplacement mechanism to return to the original position, the picking jig takes away the finished product after pressure maintaining and places it on the assembly line, completing one action cycle.

[0006] Further, in step S2, the misplacement mechanism includes a bearing plate, the side push cylinders arranged at both ends of the bearing plate and the translation cylinder arranged at the bottom of the bearing plate, and the first positioning block and the second positioning block for placing the products to be pasted with film, two first positioning blocks and two second positioning blocks are arranged opposite to each other along the length direction of the bearing plate, the output end of the side push cylinder is provided with the first positioning block, the first positioning block and the second positioning block are connected through a reset spring, and the translation cylinder is used to drive the bearing plate to move forward and backward; The output end of the translation cylinder is provided with a front and rear sliding seat, the bottom of the front and rear sliding seat is in sliding fit with the translation cylinder, and the bearing plate is connected with the translation cylinder through the front and rear sliding seat; the first positioning block and the second positioning block are each provided with two product positioning protrusions, and the two product positioning protrusions are arranged at intervals along the driving direction of the translation cylinder.

[0007] Further, the top of the bearing plate is respectively provided with a fixed block at both ends, the side push cylinder is mounted on the fixed block, and the output end of the side push cylinder penetrates through the fixed block and is connected with the first positioning block; an isolation block is mounted on the top of the bearing plate, the isolation block is located between the two fixed blocks, and a sliding area is formed between the isolation block and the fixed block in relative spacing, and the isolation block and the fixed block are connected through a guide sliding rod; The first positioning block and the second positioning block are mounted side by side on the guide rail, and both the first positioning block and the second positioning block are slidably engaged with the guide rail. The return spring is sleeved on the guide rail, and both the first positioning block and the second positioning block are located in the sliding area. The second positioning block is arranged adjacent to the isolation block.

[0008] Furthermore, a limiting strip is connected to one side of the first positioning block. The limiting strip is detachably connected to the first positioning block. A track groove is provided on the limiting strip to limit the distance between the first positioning block and the second positioning block. The track groove extends along the length of the limiting strip. One end of a limiting sliding post passes through the track groove and is connected to the second positioning block. The limiting sliding post and the limiting strip are in sliding cooperation.

[0009] Furthermore, in step S3, the conveying mechanism includes a linear guide rail fixed to the frame, a slider slidably connected to the linear guide rail, and a conveying motor that drives the slider to move; the misalignment mechanism is fixed to the slider and moves back and forth along the linear guide rail with the slider.

[0010] Furthermore, in step S1, the roll feeder peeling device includes a mounting frame, an unwinding roller, a drive motor, a take-up roller, and a peeling cylinder mounted on the mounting frame. The drive motor is connected to the take-up roller in a transmission manner. The output end of the peeling cylinder is provided with a peeling blade. The peeling blade corresponds to the peeling position of the protective film. The peeling cylinder drives the peeling blade to move downward toward the film suction mechanism to peel off the protective film. The tension adjusting roller is movably mounted on the mounting frame, and the tension adjusting roller, together with the unwinding roller and the winding roller, forms a conveying path for the protective film. The mounting frame is equipped with a light sensor, the sensing end of which is located above the peeling blade. The light sensor is electrically connected to the controller and is used to detect the movement position of the protective film. When the protective film is detected to be peeled into place, a signal is sent to the controller to trigger the action of the film suction mechanism.

[0011] Furthermore, in step S4, a support frame is provided on the frame, the support frame is located above the conveying mechanism, and the film suction mechanism and the pressure holding mechanism are installed side by side on the support frame; the film suction mechanism includes a first lifting cylinder, a second lifting cylinder and a film suction seat fixed to the output end of the second lifting cylinder, which are provided on the support frame; the bottom of the film suction seat is provided with four vacuum suction cups arranged side by side at intervals; the film suction seat is connected to an external vacuum generator through a vacuum tube; the vacuum suction cups and the vacuum tube are connected through the film suction seat; a lifting seat is installed on the output end of the first lifting cylinder, and the second lifting cylinder is installed on the lifting seat.

[0012] Furthermore, in step S8, the pressure-holding mechanism includes a pressure-holding cylinder and a pressure-holding plate disposed on the support frame; the output end of the pressure-holding cylinder is connected to the pressure-holding plate and is used to drive the pressure-holding plate to press down onto the product surface.

[0013] Furthermore, the bottom of the pressure plate is recessed inward to form multiple pressure-holding grooves, which are adapted to the shape of the product. The pressure-holding grooves correspond one-to-one with the product positioning protrusions on the misalignment mechanism. The bottom of the pressure plate is covered with an elastically deformable pressure-resistant film that covers the pressure-holding grooves. An ejector plate is provided in the pressure-holding groove, and a telescopic column is connected to the ejector plate. The telescopic column is inserted into the top of the pressure-holding groove, and a vertical spring is sleeved on the telescopic column to drive the ejector plate to move downward. The bottom of the vertical spring abuts against the top of the ejector plate, and the top of the vertical spring is connected to the top of the pressure-holding groove. As the pressure-holding cylinder drives the pressure-holding plate to press down onto the product surface, the product with the protective film pushes the pressure-holding film into the pressure-holding groove. During this process, part of the pressure-holding film presses the edge of the protective film against the edge of the product. This continues until the ejector plate presses the protective film firmly against the product through the pressure-holding film. As the pressure-holding cylinder drives the pressure-holding plate to rise, the vertical spring drives the telescopic column to push the ejector plate out of the pressure-holding groove.

[0014] Furthermore, a limiting ring protrudes outward from the top of the telescopic column, and a vertical sliding cavity is provided in the pressure-holding plate to limit the movement range of the limiting ring. The vertical sliding cavity is connected to the pressure-holding groove through a transition hole. The top of the telescopic column passes through the transition hole and is exposed in the vertical sliding cavity. The diameter of the transition hole is smaller than the diameter of the vertical sliding cavity, and the height of the vertical sliding cavity is smaller than the height of the pressure-holding groove.

[0015] Compared with existing technologies, the automatic protective film application method provided by this invention has a high degree of automation, enabling batch film application for 8 products. The protective film is peeled and applied in two groups, perfectly matching the production rhythm of an injection molding machine for 8 products at a time, completely solving the production bottleneck caused by manual film application. Through a multi-level positioning design using "product positioning protrusions, side-push cylinder positioning, and translation cylinder switching," combined with the precise adsorption and application of the film suction mechanism, the consistency of the film application position for each product is ensured, effectively avoiding appearance defects such as offset and wrinkles caused by manual operation. An added pressure-holding mechanism performs a preset time of pressure-holding treatment on the film-applied products, effectively avoiding the defects of weak and easily detached manual film application, ensuring a tight fit between the protective film and the product surface, and improving the product's dustproof protection effect. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the automatic protective film application method for products provided by the present invention; Figure 2 This is a three-dimensional schematic diagram of the misalignment mechanism and the transmission mechanism provided by the present invention; Figure 3 This is a rear-view three-dimensional schematic diagram of the misalignment mechanism provided by the present invention; Figure 4 This is a front-view three-dimensional schematic diagram of the misalignment mechanism provided by the present invention; Figure 5 This is a three-dimensional schematic diagram of the film suction mechanism and the pressure holding mechanism provided by the present invention; Figure 6 This is a three-dimensional schematic diagram of the roll feeder stripping device provided by the present invention; Figure 7 This is a side view sectional structural diagram of the pressure plate provided by the present invention.

[0017] In the diagram: Frame 10, misalignment mechanism 20, conveying mechanism 30, roll feeder peeling device 40, film suction mechanism 50, pressure holding mechanism 60, support frame 11, bearing plate 21, side push cylinder 22, translation cylinder 23, first positioning block 24, second positioning block 25, return spring 26, fixing block 27, isolation block 28, sliding area 29, guide rod 210, limit bar 211, track groove 212, limit slide column 213, product positioning protrusion 214, front and rear slide seats 231, linear guide rail 3 1. Slider 32. Conveyor motor 33. Mounting frame 41. Unwinding roller 42. Drive motor 43. Rewinding roller 44. Peeling cylinder 45. Peeling knife 46. Tension adjusting roller 47. Light sensor 48. First lifting cylinder 51. Lifting seat 52. Second lifting cylinder 53. Suction film seat 54. Vacuum suction cup 55. Pressure holding cylinder 61. Pressure holding plate 62. Pressure holding groove 63. Pressure resisting film 64. Ejection plate 65. Telescopic column 66. Vertical spring 67. Limiting ring 68. Vertical sliding cavity 69. Transition hole 610. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0020] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0021] Reference Figures 1-7 The image shows a preferred embodiment of the present invention.

[0022] The automatic protective film application method for products includes a frame 10, on which are provided a misalignment mechanism 20, a conveying mechanism 30, a roll feeder peeling device 40, a film suction mechanism 50, a pressure holding mechanism 60, and a controller; the misalignment mechanism 20, the conveying mechanism 30, the roll feeder peeling device 40, the film suction mechanism 50, and the pressure holding mechanism 60 are electrically connected to the controller. It also includes the following steps: S1: Install the entire roll of protective film onto the unwinding roller 42 of the roll feeder peeling device 40, and adjust the tension adjusting roller 47 to keep the protective film in a taut state. S2: Product pick-up and placement. Eight molded products are taken out from the injection molding machine mold by the pick-up fixture and placed on the misalignment mechanism 20. The product positioning protrusion 214 of the misalignment mechanism 20 cooperates with the positioning hole of the product to achieve initial positioning. The side push cylinders 22 at both ends of the misalignment mechanism 20 are activated to drive the products to move, so that the positions of four of the products are precisely aligned with the positions of the four protective films to be peeled off later. S3: The conveying mechanism 30 drives the misalignment mechanism 20 to move to the protective film application position; the first set of protective films is peeled off, the roll feeder peeling device 40 pulls the protective film forward a preset distance, and then the suction mechanism 50 cooperates with the roll feeder peeling device 40 to peel the 4 protective films off the roll. S4: The first set of film is applied. The film suction mechanism 50 is activated to absorb the four protective films peeled off in step S3 and precisely apply them to the four product surfaces aligned side by side on the misalignment mechanism 20. S5: The second set of protective films is peeled off. The roll feeder peeling device 40 repeats the action of step S3 and peels off 4 protective films again. S6: The second set of products is positioned. The bottom translation cylinder 23 of the misalignment mechanism 20 is activated, which moves the remaining 4 products without protective film to the protective film application position, so that they are precisely aligned with the 4 protective film positions peeled off in step S5. S7: The second set of film application: the film suction mechanism 50 repeats the action of step S4, adsorbs the 4 protective films peeled off in step S5, and precisely applies them to the remaining 4 product surfaces. S8: Pressure holding position transmission. The transmission mechanism 30 drives the 8 products that have completed film application to the pressure holding position. The pressure holding mechanism 60 is activated to perform a preset time of pressure holding treatment on the products after film application. S9: Reset and discharge. The conveyor mechanism 30 drives the misalignment mechanism 20 back to the original position. The pick-up fixture takes away the finished product that has completed the pressure holding and places it on the production line, completing one action cycle.

[0023] The misalignment mechanism 20 is slidably engaged with the conveying mechanism 30. The misalignment mechanism 20 is used to carry and switch the position of the product to be filmed. The film suction mechanism 50 and the pressure holding mechanism 60 are located above the conveying mechanism 30, and the film suction mechanism 50 and the pressure holding mechanism 60 are arranged side by side at intervals along the direction in which the misalignment mechanism 20 moves on the conveying mechanism 30. The conveying mechanism 30 drives the misalignment mechanism 20 to move between the film application position and the pressure holding position. The roll feeder peeling device 40 is used for feeding and peeling the protective film. The film suction mechanism 50 is used to absorb and transfer the protective film to the product surface. The pressure holding mechanism 60 is used for pressing and holding the film after application. The controller controls the timing and amplitude of the actions of each mechanism and the pneumatic system. The pneumatic system provides power to each cylinder-type actuator.

[0024] The entire process is controlled by a controller to manage the timing of each mechanism's actions, eliminating the need for manual intervention and preventing issues such as missed application or insecure film application, thus ensuring stable and reliable product protection. The coordinated operation of each mechanism forms a complete automated cycle of "part pickup-positioning-film application-pressure holding-discharge," significantly improving production efficiency and reducing labor costs.

[0025] The aforementioned automatic protective film application method is highly automated, enabling batch application of protective films for eight products. The process involves two groups peeling and applying the protective film, perfectly matching the production rhythm of an injection molding machine (eight products per batch), thus completely resolving the production bottleneck caused by manual film application. Through a multi-stage positioning design using the "product positioning protrusion 214, side-push cylinder 22 for positioning, and translation cylinder 23 for switching," combined with the precise adsorption and application of the film suction mechanism 50, the method ensures consistent film application position for each product, effectively avoiding appearance defects such as offsets and wrinkles caused by manual operation. An additional pressure-holding mechanism 60 applies pressure to the applied film for a preset time, effectively preventing the defects of weak and easily detached manual film application, ensuring a tight bond between the protective film and the product surface, and improving the product's dustproof protection effect.

[0026] In this embodiment, in step S2, the misalignment mechanism 20 includes a support plate 21, side-push cylinders 22 disposed at both ends of the support plate 21, and translation cylinders 23 disposed at the bottom of the support plate 21, as well as a first positioning block 24 and a second positioning block 25 for placing the film-applied product. The two first positioning blocks 24 and the two second positioning blocks 25 are arranged opposite to each other along the length direction of the support plate 21. The output end of the side-push cylinder 22 is provided with a first positioning block 24. The first positioning block 24 and the second positioning block 25 are connected by a return spring 26. The translation cylinder 23 is used to drive the support plate 21 to move back and forth. The output end of the translation cylinder 23 is provided with front and rear slide blocks 231. The bottom of the front and rear slide blocks 231 slides in cooperation with the translation cylinder 23. The carrier plate 21 is connected to the translation cylinder 23 through the front and rear slide blocks 231. The first positioning block 24 and the second positioning block 25 are each provided with two product positioning protrusions 214. The two product positioning protrusions 214 are spaced apart along the driving direction of the translation cylinder 23. The spaced arrangement of the product positioning protrusions 214 is adapted to the structure of the product to achieve reliable positioning. The positioning protrusions can play a certain guiding role in the process of driving the product to move back and forth. In conjunction with the translation cylinder 23 to drive the carrier plate 21 to move, the product can switch positions and improve the efficiency of film application.

[0027] When the external jig places eight products at once into the misalignment mechanism 20, the misalignment mechanism 20 can be used to position the products placed by the jig because the spacing between the eight products is different from the spacing of the film. The side-push cylinder 22 of the misalignment mechanism 20 works with the first positioning block 24 and the second positioning block 25 to quickly achieve the initial positioning and grouping alignment of 8 products without the need for manual adjustment of product positions, thus improving the efficiency of pre-filming preparation. The product positioning protrusion 214 precisely matches the product positioning hole, ensuring the consistency of product placement from a physical structure perspective and providing a basic positioning guarantee for subsequent accurate film application; the return spring 26 connects the first positioning block 24 and the second positioning block 25, and can automatically reset after the side push cylinder 22 is depressurized, ensuring the repeatability and accuracy of each positioning action and avoiding the accumulation of positioning deviations; The front and rear sliding blocks 231 slide in conjunction with the translation cylinder 23, which can flexibly switch the position of the product on the carrier plate 21, provide stable guidance for the movement of the carrier plate 21, reduce vibration and offset during the movement, ensure stable product positioning, and further ensure the consistency of film application quality; it can realize the alternating placement and processing of multiple sets of products, reduce equipment waiting time, and further improve film application efficiency.

[0028] In this embodiment, fixed blocks 27 are respectively installed on the top two ends of the support plate 21, and the side push cylinder 22 is installed on the fixed block 27. The output end of the side push cylinder 22 passes through the fixed block 27 and is connected to the first positioning block 24. An isolation block 28 is installed on the top of the support plate 21. The isolation block 28 is located between the two fixed blocks 27. A sliding area 29 is formed between the isolation block 28 and the fixed block 27. The isolation block 28 and the fixed block 27 are connected by a guide rod 210. The first positioning block 24 and the second positioning block 25 are installed side by side on the guide rod 210. The first positioning block 24 and the second positioning block 25 are both slidably engaged with the guide rod 210. The return spring 26 is sleeved on the guide rod 210. The first positioning block 24 and the second positioning block 25 are both located in the sliding area 29. The second positioning block 25 is arranged adjacent to the isolation block 28.

[0029] The fixed block 27 provides a stable mounting base for the side-push cylinder 22, and the isolation block 28 divides the space into independent sliding areas 29 to avoid mutual interference between the two groups of products during the positioning process and ensure the accuracy of alignment of the four products in each group; the guide rod 210 provides sliding guidance for the first positioning block 24 and the second positioning block 25 to ensure smooth and unobstructed movement of the positioning blocks and improve the stability and accuracy of the positioning action. The reset spring 26 is sleeved on the guide rod 210, which is evenly stressed and the reset action is smooth and reliable, avoiding the positioning block from failing to reset due to uneven spring stress. The limited design of the sliding area 29 prevents the positioning block from moving excessively beyond its working range, thereby improving the safety and service life of the mechanism.

[0030] In this embodiment, a limiting strip 211 is connected to one side of the first positioning block 24. The limiting strip 211 is detachably connected to the first positioning block 24. A track groove 212 is provided on the limiting strip 211 to limit the distance between the first positioning block 24 and the second positioning block 25. The track groove 212 extends along the length of the limiting strip 211. One end of the limiting slide post 213 passes through the track groove 212 and is connected to the second positioning block 25. The limiting slide post 213 slides in cooperation with the limiting strip 211.

[0031] The track groove 212 limits the movement range of the limiting slide column 213, thereby precisely limiting the maximum and minimum gap between the first positioning block 24 and the second positioning block 25, avoiding product positioning failure due to excessive separation or proximity between the two, and ensuring stable clamping force of the positioning block on the product.

[0032] The limiting strip 211 is detachably connected to the first positioning block 24. The limiting strip 211 with the corresponding length track groove 212 can be replaced according to the size of different product specifications, or the initial position of the limiting slide 213 in the track groove 212 can be adjusted to adapt to the positioning requirements of products of different sizes and improve the applicability of the device.

[0033] The sliding engagement between the limiting slide post 213 and the track groove 212 ensures that the movement of the first positioning block 24 and the second positioning block 25 remains coaxial, preventing the positioning blocks from being skewed and causing product positioning deviation, further ensuring the alignment accuracy between the product and the protective film, and improving the film application quality.

[0034] In this embodiment, in step S3, the conveying mechanism 30 includes a linear guide rail 31 fixed on the frame 10, a slider 32 slidably connected to the linear guide rail 31, and a conveying motor 33 that drives the slider 32 to move; the misalignment mechanism 20 is fixed on the slider 32 and moves back and forth along the linear guide rail 31 with the slider 32.

[0035] The linear guide rail 31 and the slider 32 cooperate to form a high-precision sliding pair. The conveyor motor 33 drives the slider 32 to move back and forth along the linear guide rail 31, which drives the misalignment mechanism 20 to smoothly convey the product. The linear guide rail 31 has high guiding accuracy and low frictional resistance, which ensures that the misalignment mechanism 20 moves accurately between the film application position and the pressure holding position, avoids film application position deviation caused by conveying offset, and ensures film application accuracy.

[0036] In this embodiment, in step S1, the roll feeder peeling device 40 includes a mounting frame 41, an unwinding roller 42 mounted on the mounting frame 41, a drive motor 43, a take-up roller 44, and a peeling cylinder 45. The drive motor 43 is connected to the take-up roller 44 in a transmission manner. The output end of the peeling cylinder 45 is provided with a peeling blade 46. The peeling blade 46 corresponds to the peeling position of the protective film. The peeling cylinder 45 drives the peeling blade 46 to move downward toward the film suction mechanism 50 to peel off the protective film. Tension adjusting roller 47 is movably mounted on mounting frame 41. Tension adjusting roller 47, unwinding roller 42, and winding roller 44 form a protective film conveying path. Mounting frame 41 is equipped with light sensor 48. The sensing end of light sensor 48 is located above peeling knife 46. Light sensor 48 is electrically connected to controller and is used to detect the movement position of protective film. When the protective film is detected to be peeled into place, a signal is sent to controller to trigger the action of film suction mechanism 50.

[0037] The unwinding roller 42 and the winding roller 44 work together with the drive motor 43 to achieve continuous feeding and winding of the protective film. The tension adjusting roller 47 can adjust the tension of the protective film in real time during the conveying process to avoid the protective film from becoming loose, overstretched or broken, ensuring stable and flat conveying of the protective film, providing reliable material support for subsequent peeling and film application processes, and ensuring continuous and uninterrupted operation of the equipment.

[0038] The peeling cylinder 45 drives the peeling blade 46 to move precisely below the film suction mechanism 50, accurately corresponding to the peeling position of the protective film. This allows for quick and clean peeling of the protective film from the base film. The peeling action is efficient and does not easily damage the protective film, avoiding problems such as tearing and wrinkling of the protective film that occur during manual peeling, thus improving the efficiency and quality of preparation work before applying the film.

[0039] A light sensor 48 is installed above the peeling blade 46 to detect the movement position of the protective film in real time. When the protective film is detected to be peeled into place, a signal is immediately sent to the controller. The controller accurately triggers the action of the film suction mechanism 50 to achieve a seamless connection between protective film peeling and adsorption transfer. This avoids the film suction mechanism 50 moving prematurely, which may result in the inability to adsorb the protective film, or moving late, which may cause the equipment to wait. This improves the coordination and process continuity of the actions of each mechanism.

[0040] By monitoring the protective film peeling position in real time through the light sensor 48, abnormal protective film delivery or incomplete peeling can be detected in a timely manner. The controller can stop the equipment operation and issue an alarm in a timely manner based on the sensor signal, so as to avoid film application failure or material waste caused by abnormal protective film peeling and reduce production losses.

[0041] In this embodiment, in step S4, a support frame 11 is provided on the frame 10. The support frame 11 is located above the conveying mechanism 30. The film suction mechanism 50 and the pressure holding mechanism 60 are installed side by side on the support frame 11. The film suction mechanism 50 includes a first lifting cylinder 51, a second lifting cylinder 53 and a film suction seat 54 fixed to the output end of the second lifting cylinder 53, which are provided on the support frame 11. The bottom of the film suction seat 54 is provided with four vacuum suction cups 55 arranged side by side at intervals. The film suction seat 54 is connected to an external vacuum generator through a vacuum tube. The vacuum suction cups 55 and the vacuum tube are connected through the film suction seat 54. A lifting seat 52 is installed on the output end of the first lifting cylinder 51 and the second lifting cylinder 53 is installed on the lifting seat 52.

[0042] The first lifting cylinder 51 drives the lifting seat 52 for coarse adjustment, while the second lifting cylinder 53 drives the film suction seat 54 for fine adjustment. This dual-stage lifting structure allows for precise control of the lifting height and speed of the film suction seat 54. When adsorbing the protective film, it descends slowly to avoid damaging the film; during film application, the application pressure and speed are precisely controlled, ensuring the protective film adheres smoothly and accurately to the product surface, improving the adhesion and flatness of the film.

[0043] The four vacuum suction cups 55 arranged side by side at intervals at the bottom of the suction cup 54 are connected to an external vacuum generator through a vacuum tube. They can form a uniform multi-point adsorption force on the protective film, preventing wrinkles, deformation or detachment of the protective film during the transfer process, ensuring that the protective film always remains flat, and providing a guarantee for high-quality film application.

[0044] In this embodiment, in step S8, the pressure holding mechanism 60 includes a pressure holding cylinder 61 and a pressure holding plate 62 disposed on the support frame 11; the output end of the pressure holding cylinder 61 is connected to the pressure holding plate 62 and is used to drive the pressure holding plate 62 to press down onto the product surface.

[0045] The pressure-holding cylinder 61 provides a stable downward pressure to the pressure-holding plate 62. The pressure can be precisely adjusted by the controller. The optimal pressure-holding pressure can be set according to the product material and the characteristics of the protective film, which can ensure that the protective film is tightly attached to the product surface and avoid damage to the product or the protective film due to excessive pressure.

[0046] The pressure plate 62 can simultaneously perform pressure treatment on 8 products after film application. The pressure holding action is highly synchronized, avoiding the tedious operation of manually pressing each product one by one, greatly improving the pressure holding efficiency and matching the overall automated production rhythm.

[0047] When the pressure plate 62 presses down, the pressure distribution is uniform, ensuring that the protective film of each product is subjected to uniform pressure, avoiding problems such as localized poor adhesion, bubbles, and curling edges, improving the adhesion and consistency of the film, and enhancing the dustproof protection effect of the product.

[0048] In this embodiment, a plurality of pressure-holding grooves 63 are formed inwardly recessed in the bottom of the pressure-holding plate 62. The pressure-holding grooves 63 are adapted to the shape of the product, and the pressure-holding grooves 63 correspond one-to-one with the product positioning protrusions 214 on the misalignment mechanism 20. An elastically deformable pressure-resistant film 64 covers the bottom of the pressure-holding plate 62, and the pressure-resistant film 64 covers the pressure-holding grooves 63. An ejector plate 65 is provided in the pressure-holding groove 63, and a telescopic column 66 is connected to the ejector plate 65. The telescopic column 66 is inserted on the top of the pressure-holding groove 63, and a vertical spring 67 is sleeved on the telescopic column 66 to drive the ejector plate 65 to move downward. The bottom of the vertical spring 67 abuts against the top of the ejector plate 65, and the top of the vertical spring 67 is connected to the top of the pressure-holding groove 63. As the pressure-holding cylinder 61 drives the pressure-holding plate 62 to press down onto the product surface, the product with the protective film pushes the pressure-holding film 64 into the pressure-holding groove 63. During this process, part of the pressure-holding film 64 presses the edge of the protective film against the edge of the product. Until the ejector plate 65 presses the protective film tightly against the product through the pressure-holding film 64. As the pressure-holding cylinder 61 drives the pressure-holding plate 62 to rise, the vertical spring 67 drives the telescopic column 66 to push the ejector plate 65 out of the pressure-holding groove 63.

[0049] The pressure-holding groove 63 is adapted to the shape of the product, so that the pressure-holding pressure is applied precisely to the film-covered area of ​​the product, avoiding pressure dispersion; the elastic pressure-holding film 64 can elastically deform with the contour of the product, closely adhering to the product surface and the edge of the protective film, pressing the edge of the protective film firmly, effectively preventing edge lifting, and avoiding scratching the product or protective film during the pressure-holding process.

[0050] Under the action of the vertical spring 67, the ejector plate 65 always has a downward elastic pressure. During the pressure holding process, the ejector plate 65 applies uniform elastic pressure to the product through the pressure-retaining film 64, avoiding pressure concentration caused by rigid contact, ensuring that the protective film is fully and tightly adhered to the product surface, eliminating air bubbles, and improving the film application quality.

[0051] After the pressure holding is completed, the vertical spring 67 drives the telescopic column 66 to push the ejector plate 65 out of the pressure holding groove 63, effectively preventing the product from sticking to the pressure holding plate 62 due to the adhesiveness of the protective film or the negative pressure, ensuring that the product can smoothly detach from the pressure holding mechanism 60, improving the smoothness of material discharge, and avoiding product damage or production interruption.

[0052] The elastic action of the elastic pressure diaphragm 64 and the vertical spring 67 can accommodate slight deviations in product size, improve the adaptability of the pressure holding mechanism 60 to the product, reduce pressure holding failure caused by slight deviations in product positioning, and further improve the stability of the pressure holding effect.

[0053] In this embodiment, a limiting ring 68 protrudes outward from the top of the telescopic column 66, and a vertical sliding cavity 69 is provided in the pressure plate 62 to limit the movement range of the limiting ring 68. The vertical sliding cavity 69 is connected to the pressure groove 63 through a transition hole 610. The top of the telescopic column 66 passes through the transition hole 610 and is exposed in the vertical sliding cavity 69. The diameter of the transition hole 610 is smaller than the diameter of the vertical sliding cavity 69, and the height of the vertical sliding cavity 69 is smaller than the height of the pressure groove 63.

[0054] The limiting ring 68 works in conjunction with the vertical sliding cavity 69 to precisely limit the maximum extension and retraction of the telescopic column 66, preventing the ejector plate 65 from overextending and causing collision damage to the product, or from over-retracting and causing insufficient pressure holding, ensuring that the stroke of the ejector plate 65 is always within a reasonable range, and improving the accuracy of pressure holding and ejection actions.

[0055] The vertical sliding cavity 69 provides a stable guide for the limiting ring 68 and the telescopic column 66, ensuring that the telescopic column 66 moves in the vertical direction, avoiding uneven force on the ejector plate 65 due to the skewness of the telescopic column 66, thereby ensuring a uniform distribution of the pressure holding pressure, improving the pressure holding effect, and preventing the product from shifting during ejection.

[0056] The diameter of the transition hole 610 is smaller than the diameter of the vertical sliding cavity 69, forming a stepped structure, which can effectively bear the force of the limiting ring 68 and avoid damage caused by force concentration at the edge of the vertical sliding cavity 69; the height of the vertical sliding cavity 69 is smaller than the height of the pressure holding groove 63, ensuring that the extension stroke of the telescopic column 66 matches the depth of the pressure holding groove 63, avoiding structural interference and improving the reliability of the mechanism operation.

[0057] 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 spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for automatically applying protective film to a product, characterized in that, The machine includes a frame, on which are mounted a misalignment mechanism, a conveying mechanism, a roll feeder peeling device, a film suction mechanism, a pressure holding mechanism, and a controller; the misalignment mechanism, the conveying mechanism, the roll feeder peeling device, the film suction mechanism, and the pressure holding mechanism are each electrically connected to the controller. It also includes the following steps: S1: Install the entire roll of protective film onto the unwinding roller of the roll feeder peeling device, and adjust the tension adjusting roller to keep the protective film in a taut state. S2: Product pick-up and placement. Eight molded products are taken out from the injection molding machine mold by the pick-up fixture and placed on the misalignment mechanism. The product positioning protrusion of the misalignment mechanism cooperates with the positioning hole of the product to achieve initial positioning. The side push cylinders at both ends of the misalignment mechanism are activated to drive the products to move, so that the positions of four of the products are precisely aligned with the positions of the four protective films to be peeled off later. S3: The conveying mechanism drives the misalignment mechanism to move to the protective film application position; the first set of protective films is peeled off, the roll feeder peeling device pulls the protective film forward a preset distance, and then the suction mechanism cooperates with the roll feeder peeling device to peel the 4 protective films off the roll. S4: First set of film application. The film suction mechanism is activated to absorb the four protective films peeled off in step S3 and precisely apply them to the four product surfaces aligned side by side on the misalignment mechanism. S5: The second set of protective films is peeled off. The roll feeder peeling device repeats the action of step S3 and peels off 4 protective films again. S6: Positioning of the second group of products: The bottom translation cylinder of the misalignment mechanism is activated, which drives the remaining 4 products without protective film to the protective film application position, so that they are precisely aligned with the positions of the 4 protective films peeled off in step S5. S7: The second set of film is applied. The film suction mechanism repeats the action of step S4, adsorbs the 4 protective films peeled off in step S5, and precisely applies them to the remaining 4 product surfaces. S8: Pressure holding position conveying, the conveying mechanism drives the 8 products that have completed film application to the pressure holding position, the activation of the pressure holding mechanism performs a preset time of pressure holding treatment on the film-applied products; S9: Reset and discharge. The conveying mechanism drives the misalignment mechanism back to the original position. The pick-up fixture takes away the finished product that has completed the pressure holding and places it on the production line, completing one operation cycle.

2. The automatic protective film application method for products as described in claim 1, characterized in that, In step S2, the misalignment mechanism includes a support plate, side-push cylinders located at both ends of the support plate, a translation cylinder located at the bottom of the support plate, and a first positioning block and a second positioning block for placing the film-applied product. The two first positioning blocks and the two second positioning blocks are arranged opposite each other along the length of the support plate. The output end of the side-push cylinder is provided with a first positioning block. The first positioning block and the second positioning block are connected by a return spring. The translation cylinder is used to drive the support plate to move back and forth. The output end of the translation cylinder is provided with front and rear slide blocks, the bottom of which slides in cooperation with the translation cylinder. The support plate is connected to the translation cylinder through the front and rear slide blocks. The first positioning block and the second positioning block are each provided with two product positioning protrusions, which are spaced apart along the driving direction of the translation cylinder.

3. The method for automatically applying protective film to a product as described in claim 2, characterized in that, Fixed blocks are installed on both ends of the top of the support plate. The side-push cylinder is installed on the fixed block, and the output end of the side-push cylinder passes through the fixed block and is connected to the first positioning block. An isolation block is installed on the top of the support plate. The isolation block is located between the two fixed blocks. A sliding area is formed between the isolation block and the fixed block. The isolation block and the fixed block are connected by a guide rod. The first positioning block and the second positioning block are mounted side by side on the guide rail, and both the first positioning block and the second positioning block are slidably engaged with the guide rail. The return spring is sleeved on the guide rail, and both the first positioning block and the second positioning block are located in the sliding area. The second positioning block is arranged adjacent to the isolation block.

4. The method for automatically applying protective film to a product as described in claim 3, characterized in that, A limiting strip is connected to one side of the first positioning block. The limiting strip is detachably connected to the first positioning block. A track groove is provided on the limiting strip to limit the distance between the first positioning block and the second positioning block. The track groove extends along the length of the limiting strip. One end of a limiting sliding post passes through the track groove and is connected to the second positioning block. The limiting sliding post is slidably engaged with the limiting strip.

5. The method for automatically applying protective film to a product as described in claim 4, characterized in that, In step S3, the conveying mechanism includes a linear guide rail fixed to the frame, a slider slidably connected to the linear guide rail, and a conveying motor that drives the slider to move; the misalignment mechanism is fixed to the slider and moves back and forth along the linear guide rail with the slider.

6. The method for automatically applying protective film to a product as described in any one of claims 1 to 5, characterized in that, In step S1, the roll feeder peeling device includes a mounting frame, an unwinding roller, a drive motor, a take-up roller, and a peeling cylinder mounted on the mounting frame. The drive motor is connected to the take-up roller in a transmission manner. The output end of the peeling cylinder is provided with a peeling blade. The peeling blade corresponds to the peeling position of the protective film. The peeling cylinder drives the peeling blade to move downward toward the film suction mechanism to peel off the protective film. The tension adjusting roller is movably mounted on the mounting frame, and the tension adjusting roller, together with the unwinding roller and the winding roller, forms a conveying path for the protective film. The mounting frame is equipped with a light sensor, the sensing end of which is located above the peeling blade. The light sensor is electrically connected to the controller and is used to detect the movement position of the protective film. When the protective film is detected to be peeled into place, a signal is sent to the controller to trigger the action of the film suction mechanism.

7. The method for automatically applying protective film to a product as described in any one of claims 1 to 5, characterized in that, In step S4, a support frame is provided on the frame, which is located above the conveying mechanism. The film suction mechanism and the pressure holding mechanism are installed side by side on the support frame. The film suction mechanism includes a first lifting cylinder, a second lifting cylinder, and a film suction seat fixed to the output end of the second lifting cylinder, all mounted on the support frame. The bottom of the film suction seat is provided with four vacuum suction cups arranged side by side at intervals. The film suction seat is connected to an external vacuum generator through a vacuum tube, and the vacuum suction cups and the vacuum tube are connected through the film suction seat. A lifting seat is installed on the output end of the first lifting cylinder, and the second lifting cylinder is installed on the lifting seat.

8. The method for automatically applying protective film to a product as described in claim 7, characterized in that, In step S8, the pressure holding mechanism includes a pressure holding cylinder and a pressure holding plate disposed on the support frame; the output end of the pressure holding cylinder is connected to the pressure holding plate and is used to drive the pressure holding plate to press down onto the product surface.

9. The method for automatically applying protective film to a product as described in claim 8, characterized in that, The bottom of the pressure plate has an inwardly recessed area forming multiple pressure-holding grooves, which are adapted to the shape of the product. Each pressure-holding groove corresponds to a product positioning protrusion on the misalignment mechanism. The bottom of the pressure plate is covered with an elastically deformable pressure-resistant membrane that covers the pressure-holding grooves. An ejector plate is provided in the pressure-holding groove, and a telescopic column is connected to the ejector plate. The telescopic column is inserted into the top of the pressure-holding groove, and a vertical spring is sleeved on the telescopic column to drive the ejector plate to move downward. The bottom of the vertical spring abuts against the top of the ejector plate, and the top of the vertical spring is connected to the top of the pressure-holding groove. As the pressure-holding cylinder drives the pressure-holding plate to press down onto the product surface, the product with the protective film pushes the pressure-holding film into the pressure-holding groove. During this process, part of the pressure-holding film presses the edge of the protective film against the edge of the product. This continues until the ejector plate presses the protective film firmly against the product through the pressure-holding film. As the pressure-holding cylinder drives the pressure-holding plate to rise, the vertical spring drives the telescopic column to push the ejector plate out of the pressure-holding groove.

10. The method for automatically applying protective film to a product as described in claim 9, characterized in that, The top of the telescopic column has a limiting ring protruding outward in the circumferential direction. The pressure plate has a vertical sliding cavity for limiting the movement range of the limiting ring. The vertical sliding cavity is connected to the pressure-holding groove through a transition hole. The top of the telescopic column passes through the transition hole and is exposed in the vertical sliding cavity. The diameter of the transition hole is smaller than the diameter of the vertical sliding cavity, and the height of the vertical sliding cavity is smaller than the height of the pressure-holding groove.

Images