In-mold film pasting equipment and working method thereof

Abstract

The invention discloses in-mold film pasting equipment and a working method thereof, and the in-mold film pasting equipment comprises a film taking mechanism in which a plurality of plastic films are placed and stacked; the conveying mechanism is provided with a mechanical arm assembly, and the mechanical arm assembly takes the plastic films to the assembling area one by one; and the static electricity generating device is connected with the film taking mechanism, the static electricity generating device is used for completing static electricity attachment on the plastic film conveyed by the mechanical arm assembly, and the plastic film obtained after static electricity attachment is completed is conveyed to the assembling area through the mechanical arm assembly to be stamped and attached to the surface of the to-be-machined mold.

Description

Technical Field

[0001] The present application relates to the technical field of product processing, and in particular to an in-mold laminating device and a working method thereof. Background Art

[0002] In many product manufacturing processes, such as plastic product molding, automotive interior processing, and the appearance decoration of consumer electronic products, the process of film pasting on the mold surface is often involved. The adhesion quality of the film on the mold surface directly affects the key quality indicators of the final product, such as appearance integrity, protective performance, and durability.

[0003] Traditionally, the industry generally uses glue bonding to fix the film to the mold surface. This glue bonding process has a long history and is widely used. It can achieve the connection between the film and the mold to a certain extent. However, the glue bonding process has a series of significant defects. First, the preparation and coating process of the glue requires a high degree of accuracy and stability. A slight deviation may cause the film to not fit firmly, bubbles or glue overflow, which seriously affects the yield rate of the product. Second, the glue often requires a certain curing time after coating, which undoubtedly greatly prolongs the entire production cycle and reduces production efficiency. Especially in the large-scale, high-efficiency modern industrial production environment, this increase in time cost is particularly prominent. In addition, from the perspective of the long-term stability of product quality, the glue may cause the film to peel off and warp from the mold surface due to aging, chemical reactions or the influence of external environmental factors (such as temperature changes, mechanical stress, etc.) after long-term use, which greatly reduces the product quality.

[0004] In summary, with the continuous improvement of the manufacturing industry's requirements for product quality, production efficiency and cost control, the traditional glue lamination process has gradually become unable to meet the growing industrial needs in the field of film-in-film lamination. Summary of the invention

[0005] The purpose of the present application is to provide an in-mold lamination device and a working method thereof, so as to improve the product quality and lamination stability of the in-mold lamination.

[0006] In order to achieve the above objectives, the technical solution adopted in the present application is: to provide an in-mold film laminating equipment, including: a film taking mechanism, in which multiple plastic films are placed and stacked; a conveying mechanism, in which the conveying mechanism is provided with a robotic arm assembly, and the robotic arm assembly takes the plastic films one by one to the assembly area; an electrostatic generating device, which is connected to the film taking mechanism, and is used to complete electrostatic attachment of the plastic film transported by the robotic arm assembly. After the electrostatic attachment is completed, the plastic film is transported to the assembly area by the robotic arm assembly for stamping and bonding to the surface of the mold to be processed.

[0007] As a preferred embodiment, the film taking mechanism includes a main frame and a film placing platform, wherein the film placing platform is connected to the main frame, and the film placing platform is used for placing stacked plastic films to be taken. A driving device is provided in the main frame to drive the film placing platform to move relative to the main frame, and adjust the position of the film placing platform to cooperate with the robotic arm assembly to take the plastic films one by one.

[0008] As another preferred embodiment, the robotic arm assembly includes: a first robotic arm and a second robotic arm, the first robotic arm is movably connected to the main frame, and the second robotic arm is externally connected to a multi-axis linkage mechanism for movement; the first robotic arm takes the plastic film to a transfer position to adsorb and dock the plastic film on the first robotic arm onto the second robotic arm, and the plastic film is transported by the second robotic arm through the electrostatic generating device to the assembly area and is bonded to the surface of the mold to be processed through stamping.

[0009] Further preferably, a first suction cup assembly is provided at the end of the first robotic arm, and the plastic film on the film placing platform is sucked up one by one through the first suction cup assembly; a second suction cup assembly is provided at the end of the second robotic arm, and the second suction cup assembly also includes a first docking end and a second docking end, the first docking end and the second docking end are arranged opposite to each other, and the first docking end is used for adsorbing and docking with the plastic film on the first suction cup assembly, and the second robotic arm brings the plastic film to the assembly area, and punches and bonds the plastic film to the surface of the mold to be processed through the first docking end, and can simultaneously pull and suck the plastic film on the other side of the assembly area to the second docking end.

[0010] Further preferably, the film placing platform is provided with at least one positioning groove, and a limiting column is arranged corresponding to the positioning groove, and the limiting column is movably connected to the main frame; the plastic film is provided with an opening for engaging with the limiting column, and the position of plastic films of different sizes on the film placing platform is determined by moving the limiting column to engage with the opening to limit the plastic film.

[0011] Further preferably, the first suction cup assembly includes a plate body and a plurality of adjustable suction cups, the adjustable suction cups are movably connected to the plate body, and the plurality of adjustable suction cups are connected by a limiting hose to synchronize the relative positions of the plurality of adjustable suction cups.

[0012] Preferably, the film removing mechanism also includes a roller and a leg, the leg is connected to the main frame in a telescopic and adjustable manner, and the roller is connected to the main frame; wherein the leg supports the main frame, and when the film removing mechanism needs to change position, the leg retracts, and the roller touches the ground to support the main frame, so as to drive the film removing mechanism to move through the roller.

[0013] Preferably, the present application document also provides a working method of an in-mold film laminating device, which is applicable to any of the in-mold film laminating devices described above, and the working method comprises: step S1: determining the size of the plastic film to be processed; step S2: placing the plastic film on a film placing platform, and adjusting the limiting columns to fit the limiting plastic film according to the size of the plastic film; step S3: controlling the robotic arm assembly to transport the plastic film through the electrostatic generating device to complete electrostatic attachment; step S4: controlling the robotic arm assembly to transport the plastic film to the assembly area to complete the stamping and bonding of the plastic film with the surface of the mold to be processed.

[0014] Further preferably, the step S3 also includes: step S30: according to the material and surface area of ​​the plastic film to be processed, calling up a preset parameter table of the electrostatic generating device to determine the corresponding initial value of the electrostatic field strength and the initial speed of the plastic film passing through the electrostatic generating device.

[0015] Further preferably, after step S30, it also includes: detecting the electrostatic charge density value on the surface of the plastic film after passing through the electrostatic generating device; judging whether the electrostatic charge density value reaches a preset range; if it is judged to be yes, controlling the robotic arm assembly to transport the plastic film to the assembly area; if it is judged to be no, controlling the robotic arm assembly to return to the initial position, and adjusting the initial value of the electrostatic field strength and the initial speed of the plastic film passing through the electrostatic generating device, and then repeating step S3.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] The film placement platform of the film taking mechanism can adjust its position to ensure that the robotic arm delivers the plastic film to the electrostatic generating device area in a precise and stable path, so that the plastic film has a consistent posture when entering and can interact with the electrode evenly, achieving predictable electrostatic charge distribution, reducing film defects such as wrinkles or poor adhesion caused by uneven electrostatic adsorption, and laying a good foundation for subsequent film laminating operations.

[0018] By electrostatically attaching plastic film to improve film laminating efficiency and quality stability, the scrap rate is reduced, product consistency and reliability are improved, making the equipment more competitive in industrial production and better meeting the manufacturing industry's requirements for product quality, production efficiency and cost control, effectively solving the problems existing in the traditional glue laminating process.

[0019] With the help of a multi-axis linkage mechanism, the second robotic arm in the robotic arm assembly can accurately control the relative position and speed of plastic films of different materials and sizes when they pass through the electrostatic generating device, adjust the residence time and movement trajectory in the electrostatic field, achieve the best electrostatic adsorption effect, and achieve precise control of the electrostatic adsorption effect, further improving the film quality and appearance consistency, and enhancing the quality and market competitiveness of the final product.

[0020] In the working method, the parameter table of the electrostatic generating device is called up according to the material and surface area of ​​the plastic film to determine the initial value, and the electrostatic charge density value is detected by the detection module, and adjustments are made to the non-compliant conditions. This can effectively cope with the differences in the electrostatic adsorption process of different plastic films, ensure a stable and reliable electrostatic adsorption process, and at the same time ensure that each piece of plastic film obtains a stable and reliable electrostatic adsorption effect, thereby improving the success rate of film pasting, reducing defects, and enhancing equipment working reliability and product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the in-mold laminating equipment;

[0022] Figure 2 It is a structural schematic diagram of the film placement platform and the first suction cup assembly;

[0023] Figure 3 This is a schematic diagram of the structure when the first robotic arm is taking the film;

[0024] Figure 4 It is a structural schematic diagram of the second robotic arm adsorbing the plastic film through the electrostatic generating device;

[0025] Figure 5 This is a schematic diagram of the structure after the second robotic arm adsorbs the plastic film and completes electrostatic attachment;

[0026] Figure 6 It is a structural schematic diagram when the second robot arm enters the assembly area;

[0027] Figure 7 is another structural schematic diagram of the film placement platform and the first suction cup assembly;

[0028] Figure 8 It is a schematic structural diagram of the second suction cup assembly.

[0029] In the figure: 1. In-mold laminating equipment; 2. Plastic film; 201. Opening; 3. Assembly area; 10. Film taking mechanism; 11. Main frame; 12. Film placing platform; 121. Positioning groove; 122. Limiting column; 123. Opening; 13. Roller; 14. Leg; 20. Transport mechanism; 21. Robot arm assembly; 211. First robot arm; 2111. First suction cup assembly; 2112. Adjustable suction cup; 2113. Limiting hose; 2114. Plate body; 212. Second robot arm; 2121. Second suction cup assembly; 2122. First docking end; 2123. Second docking end; 22. Multi-axis linkage mechanism; 221. First drive assembly; 222. First transverse slide rail; 223. Second transverse slide rail; 224. Longitudinal slide rail; 225. Second drive assembly; 30. Static electricity generating device. DETAILED DESCRIPTION

[0030] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0032] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0033] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0034] In a preferred embodiment, see Figures 1 to 8 The present application document provides an in-mold film laminating device 1, comprising: a film taking mechanism 10, in which a plurality of plastic films 2 are placed and stacked; a conveying mechanism 20, in which the conveying mechanism 20 is provided with a robotic arm assembly 21, and the robotic arm assembly 21 takes the plastic films 2 one by one to an assembly area 3; an electrostatic generating device 30, which is connected to the film taking mechanism 10 and is used to complete electrostatic attachment of the plastic film 2 transported by the robotic arm assembly 21. After the electrostatic attachment is completed, the plastic film 2 is transported to the assembly area 3 by the robotic arm assembly 21 to be stamped and attached to the surface of the mold to be processed.

[0035] As a preferred embodiment, the film taking mechanism 10 includes a main frame 11 and a film placing platform 12, which is connected to the main frame 11. The film placing platform 12 is used to place the stacked plastic films 2 to be taken. A driving device is provided in the main frame 11 to drive the film placing platform 12 to move relative to the main frame 11, and adjust the position of the film placing platform 12 to cooperate with the robotic arm assembly 21 to take the plastic films 2 one by one.

[0036] Among them, by flexibly adjusting the position of the film placement platform 12 through the driving device, it can be ensured that the mechanical arm assembly 21 can transport the plastic film 2 to the electrostatic generating device 30 area in a precise and stable path after taking the plastic film 2. The stable transportation path helps to ensure the consistency of the posture of the plastic film 2 when entering the electrostatic generating device 30, so that the electrostatic generating device 30 can electrostatically treat the plastic film 2 more uniformly. When the electrostatic generating device 30 generates an electrostatic field through a specific electrode structure, the stable and consistent plastic film 2 can interact with the electrode at the same angle and distance, thereby achieving a uniform and predictable electrostatic charge distribution. This not only improves the quality and stability of electrostatic adhesion, but also reduces film defects caused by uneven electrostatic adsorption, such as bubbles, wrinkles or loose adhesion, and lays a good foundation for subsequent film operations, thereby improving the working efficiency of the entire film sticking equipment and the stability of film sticking quality, reducing the scrap rate, and improving the consistency and reliability of the product, making the equipment more competitive in industrial production.

[0037] As another preferred embodiment, the robot arm assembly 21 includes: a first robot arm 211 and a second robot arm 212, the first robot arm 211 is movably connected to the main frame 11, and the second robot arm 212 is externally connected to a multi-axis linkage mechanism 22 for movement; the first robot arm 211 takes the plastic film 2 to the transfer position to adsorb and dock the plastic film 2 on the first robot arm 211 onto the second robot arm 212, and the plastic film 2 is transported by the second robot arm 212 through the electrostatic generating device 30 to the assembly area 3 and is pressed to fit the surface of the mold to be processed.

[0038] The division of labor and cooperation between the first mechanical arm 211 and the second mechanical arm 212 has a significant beneficial effect. The first mechanical arm 211 focuses on accurately sucking the plastic film 2 from the film placement platform 12. Due to its movable connection with the main frame 11, it can perform precise positioning and film removal operations in a smaller range, reducing the complexity of the overall mechanical structure and the difficulty of motion control. The second mechanical arm 212, with the help of the multi-axis linkage mechanism 22, can achieve flexible movement in a larger spatial range, smoothly transport the plastic film 2 through the electrostatic generating device 30 and accurately fit it to the surface of the mold to be processed. This dual-mechanical arm design not only improves the working efficiency of film pasting, but also can adapt to production environments of different layouts and sizes. For example, in a production line with relatively compact space, the local precise operation of the first mechanical arm 211 and the large-scale flexible transportation of the second mechanical arm 212 can effectively avoid interference between mechanical arms, while ensuring the smooth progress of the film pasting process, improving the versatility and adaptability of the equipment.

[0039] It should be noted that see Figure 4The multi-axis linkage mechanism 22 includes a first transverse slide rail 222 and a second transverse slide rail 223. One end of the first driving component 221 is movably connected to the first transverse slide rail 222, so that the first driving component 221 can move along the X-axis direction. At the same time, the first driving component 221 is fixedly connected to the second transverse slide rail 223, and then with the movement of the first driving component 221, the second transverse slide rail 223 is driven to determine the position of the second transverse slide rail 223 in the X-axis direction. The second driving member is connected to the second transverse slide rail 223, and the second driving member can move relative to the second transverse slide rail 223 along the Y-axis direction. The second driving component 225 is connected to the longitudinal slide rail 224, so as to drive the longitudinal slide rail 224 to determine the position of the longitudinal slide rail 224 on the Y-axis. The longitudinal slide rail 224 can move relative to the second driving component 225 along the Z-axis direction. The end of the longitudinal slide rail 224 is fixedly connected to the second robotic arm 212, so as to finally control the second robotic arm 212 to move in the spatial orientation.

[0040] Through multi-axis coordinated motion control, the second mechanical arm 212 can realize the adjustment of any position and posture in three-dimensional space. When the plastic film 2 passes through the electrostatic generator 30, the relative position and speed of the plastic film 2 and the electrostatic generator 30 can be accurately controlled to ensure the uniformity and stability of electrostatic attachment. For example, according to the plastic film 2 of different materials and sizes, its residence time and movement trajectory in the electrostatic field can be adjusted to achieve the best electrostatic adsorption effect. When the plastic film 2 is attached to the surface of the mold to be processed, the angle and fitting pressure of the plastic film 2 can be accurately adjusted according to the shape and position of the mold, so that the film is closely attached to the mold, wrinkles are reduced, and the film quality and appearance consistency of the product are improved, thereby improving the quality and market competitiveness of the final product.

[0041] Further preferably, a first suction cup assembly 2111 is provided at the end of the first robotic arm 211, and the plastic film 2 on the film placing platform 12 is sucked up one by one through the first suction cup assembly 2111; a second suction cup assembly 2121 is provided at the end of the second robotic arm 212, and the second suction cup assembly 2121 also includes a first docking end 2122 and a second docking end 2123, and the first docking end 2122 and the second docking end 2123 are arranged opposite to each other, and the first docking end 2122 is used for adsorption and docking with the plastic film 2 on the first suction cup assembly 2111, and the second robotic arm 212 brings the plastic film 2 to the assembly area 3, and punches and fits the plastic film 2 to the surface of the mold to be processed through the first docking end 2122, and can simultaneously pull and suck the plastic film 2 on the other side of the assembly area 3 to the second docking end 2123.

[0042] Further preferably, the film placing platform 12 is provided with at least one positioning groove 121, and a limiting column 122 is arranged in the corresponding positioning groove 121, and the limiting column 122 is connected to the main frame 11 in a movably manner; the plastic film 2 is provided with an opening 201 for engaging with the limiting column 122, and the position of plastic films 2 of different sizes on the film placing platform 12 is determined by moving the limiting column 122 to engage with the opening 201 to limit the plastic film 2.

[0043] By engaging the opening 201 of the plastic film 2 with the limiting column 122, the position of the plastic film 2 on the film placement platform 12 can be effectively limited to prevent it from shifting or shaking during stacking or waiting for film removal. For plastic films 2 of different sizes, the position of the limiting column 122 can be flexibly adjusted so that the plastic film 2 can always be accurately positioned. This precise positioning function ensures that the plastic film 2 is in the correct position every time the first mechanical arm 211 takes the film, improves the success rate and accuracy of film removal, reduces problems such as film removal failure or film misalignment caused by position deviation of the plastic film 2, thereby improving the working stability of the entire film pasting equipment and the consistency of film pasting quality.

[0044] Among them, see Figure 2 The film placing platform 12 is also provided with a plurality of openings 123 of different sizes to prevent multiple plastic films 2 from being stacked on the film placing platform 12 and thus being adsorbed to the surface of the film placing platform 12 , thereby reducing the difficulty of the first suction cup assembly 2111 to absorb the plastic film 2 .

[0045] Further preferably, the first suction cup assembly 2111 includes a plate body 2114 and a plurality of adjustable suction cups 2112 , the adjustable suction cup 2112 is movably connected to the plate body 2114 , and the plurality of adjustable suction cups 2112 are connected by a limiting hose 2113 to synchronize the relative positions of the plurality of adjustable suction cups 2112 .

[0046] Specifically, the first suction cup assembly 2111 is provided with four adjustable suction cups 2112, which are located at four azimuths of the plate body 2114, so as to distribute the adsorption force evenly, so that the plastic film 2 is relatively stable after being adsorbed by the first suction cup. The four adjustable suction cups 2112 are located in the adjustment groove and adjust the adsorption distance by approaching or moving away from each other. Since the limiting hose 2113 fixes the four adjustable suction cups 2112 to each other, the position adjustment between the four adjustable suction cups 2112 is relatively convenient and can be adjusted synchronously. When the surface area of ​​the plastic film 2 to be processed is larger, the four adjustable suction cups 2112 are moved away from each other, and vice versa. Correspondingly, the larger the surface area of ​​the plastic film 2 to be processed, the position of the limiting column 122 needs to be moved synchronously to correspond to the opening 201 on the plastic film 2 to prevent the plastic film 2 from deviating on the film placement platform 12. Similarly, four limiting columns 122 are provided, corresponding to the four openings 201 on the plastic film 2, so as to effectively limit the movement of the plastic film 2. A plurality of adjustable suction cups 2112 are connected by a limiting hose 2113, and can automatically adjust the adsorption position according to the size of the plastic film 2 to ensure that the adsorption force is evenly distributed, so that reliable adsorption can be achieved regardless of how the size of the plastic film 2 changes.

[0047] Preferably, the film removing mechanism 10 also includes a roller 13 and a leg 14, the leg 14 is connected to the main frame 11 in a telescopic and adjustable manner, and the roller 13 is connected to the main frame 11; wherein, the leg 14 supports the main frame 11, and when the film removing mechanism 10 needs to change position, the leg 14 retracts, and the roller 13 touches the ground to support the main frame 11, so as to drive the film removing mechanism 10 to move through the roller 13.

[0048] Among them, see Figures 2 to 6 The complete processing and laminating process of a single plastic film 2 is as follows: Figure 2 The figure shows a state where the plastic film 2 is not placed on the film placement platform 12, i.e., a preparation state. At this time, the plate body 2114 of the first suction cup assembly 2111 is parallel to the film placement platform 12. When the plastic film 2 to be processed is placed on the film placement platform 12, the first mechanical arm 211 drives the first suction cup assembly 2111 to approach and absorb the plastic film 2. Figure 3 As shown, when the plastic film 2 is adsorbed onto the first suction cup assembly 2111, the first suction cup assembly 2111 is flipped over to adsorb and dock with the second suction cup assembly 2121. At this time, the plastic film 2 is located on the second suction cup assembly 2121, and the second mechanical arm 212 is driven to move by the multi-axis linkage mechanism 22, and the electrostatic attachment is completed through the electrostatic generating device 30, that is, Figure 4 After the electrostatic attachment is completed, the second suction cup assembly 2121 is turned over to Figure 5 When the second suction cup assembly 2121 is turned over, the second suction cup assembly 2121 is transported to the top of the assembly area 3 and extends downward into the assembly area 3. Figure 6The state shown enters the assembly area 3, and the second driving component 225 moves on the Y axis to complete the stamping and bonding of the plastic film 2 on the first docking end 2122, and the plastic film 2 on the other side is pulled and sucked to the second docking end 2123 at the second docking end 2123.

[0049] Preferably, the present application document also provides a working method of an in-mold laminating device 1, and the working method of the in-mold laminating device 1 is applicable to any of the in-mold laminating devices 1 mentioned above, and the working method includes: step S1: determining the size of the plastic film 2 to be processed; step S2: placing the plastic film 2 on the film placing platform 12, and adjusting the limiting column 122 to fit the limiting plastic film 2 according to the size of the plastic film 2; step S3: controlling the robot arm assembly 21 to transport the plastic film 2 through the electrostatic generating device 30 to complete electrostatic attachment; step S4: controlling the robot arm assembly 21 to transport the plastic film 2 to the assembly area 3 to complete the stamping and bonding of the plastic film 2 with the surface of the mold to be processed.

[0050] Further preferably, step S3 also includes: step S30: according to the material and surface area of ​​the plastic film 2 to be processed, the preset parameter table of the electrostatic generator 30 is retrieved to determine the corresponding initial value of the electrostatic field strength and the initial speed of the plastic film 2 passing through the electrostatic generator 30. That is, in a specific embodiment, when the plastic film 2 to be processed is made of polyethylene (PE) and has a surface area of ​​0.3 square meters, the initial value of the electrostatic field strength retrieved from the parameter table is set to 5kV / cm, and the initial speed of the plastic film 2 passing through the electrostatic generator 30 is set to 0.4 meters / second. This is because after a large number of experimental tests and data analysis, it is found that for PE plastic film 2 of this material and area, under this electrostatic field strength and speed, a relatively ideal electrostatic adsorption effect can be initially achieved, so that the surface of the plastic film 2 carries an appropriate amount of electrostatic charge, creating conditions for subsequent adsorption and bonding with the mold surface.

[0051] Further preferably, a detection module is also provided in the electrostatic generating device 30, and therefore after step S30, the method also includes: detecting the electrostatic charge density value on the surface of the plastic film 2 after passing through the electrostatic generating device 30 by the detection module; judging whether the electrostatic charge density value reaches a preset range; if judged as yes, controlling the robot arm assembly 21 to transport the plastic film 2 to the assembly area 3; if judged as no, controlling the robot arm assembly 21 to return to the initial position, and adjusting the initial value of the electrostatic field strength and the initial speed of the plastic film 2 passing through the electrostatic generating device 30, and then repeating step S3.

[0052] In a specific embodiment, it is assumed that for the above-mentioned 0.3 square meters of PE plastic film 2, the preset electrostatic charge density range is 4-6 microcoulombs / square centimeter. When it is detected that the surface electrostatic charge density value of the plastic film 2 after passing through the electrostatic generating device 30 is 3.5 microcoulombs / square centimeter, which is lower than the lower limit of the preset range, it is judged as no at this time. Then the mechanical arm assembly 21 is controlled to return to the initial position, and the initial value of the electrostatic field strength is increased by 0.5kV / cm, that is, adjusted to 5.5kV / cm, and at the same time, the initial speed of the plastic film 2 passing through the electrostatic generating device 30 is reduced by 0.1 meters / second, adjusted to 0.3 meters / second, and then step S3 is repeated again, so that the plastic film 2 passes through the electrostatic generating device 30 again for electrostatic adsorption treatment, and then the electrostatic charge density value is detected again until it falls into the preset range of 4-6 microcoulombs / square centimeter, and then the mechanical arm assembly 21 is controlled to transport the plastic film 2 to the assembly area 3 for the next step of stamping and bonding operation. This precise detection and adjustment mechanism can effectively deal with the differences in the electrostatic adsorption process of plastic films 2 of different materials and areas, ensuring that each piece of plastic film 2 can obtain a stable and reliable electrostatic adsorption effect, thereby improving the success rate and quality of film pasting, reducing film pasting defects caused by poor electrostatic adsorption, and improving the working reliability and product qualification rate of the entire in-mold film pasting equipment 1.

[0053] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. An in-mold laminating device, characterized in that: include: A film taking mechanism, in which a plurality of plastic films are placed and stacked; A conveying mechanism, wherein the conveying mechanism is provided with a mechanical arm assembly, and the mechanical arm assembly takes the plastic films one by one to the assembly area; An electrostatic generating device is connected to the film taking mechanism and is used to complete electrostatic attachment of the plastic film transported by the robotic arm assembly. After the electrostatic attachment is completed, the plastic film is transported by the robotic arm assembly to the assembly area for stamping and bonding to the surface of the mold to be processed.

2. The in-mold laminating equipment according to claim 1, characterized in that: The film taking mechanism includes a main frame and a film placing platform, wherein the film placing platform is connected to the main frame and is used to place stacked plastic films to be taken. A driving device is provided in the main frame to drive the film placing platform to move relative to the main frame and adjust the position of the film placing platform to cooperate with the robotic arm assembly to take the plastic films one by one.

3. The in-mold laminating equipment according to claim 2, characterized in that: The mechanical arm assembly comprises: a first mechanical arm and a second mechanical arm, the first mechanical arm is movably connected to the main frame, and the second mechanical arm is externally connected to a multi-axis linkage mechanism for movement; The first robot arm takes the plastic film to the transfer position to adsorb and dock the plastic film on the first robot arm onto the second robot arm. The second robot arm transports the plastic film through the electrostatic generating device to the assembly area and is pressed onto the surface of the mold to be processed.

4. The in-mold laminating equipment according to claim 3, characterized in that: Said A first suction cup assembly is provided at the end of the first mechanical arm, and the plastic films on the film placement platform are sucked up one by one by the first suction cup assembly; A second suction cup assembly is provided at the end of the second robotic arm, and the second suction cup assembly also includes a first docking end and a second docking end, the first docking end and the second docking end are arranged opposite to each other, the first docking end is used for adsorbing and docking with the plastic film on the first suction cup assembly, the second robotic arm brings the plastic film to the assembly area, and presses and bonds the plastic film to the surface of the mold to be processed through the first docking end, and can simultaneously pull and suck the plastic film on the other side of the assembly area to the second docking end.

5. The in-mold laminating equipment according to claim 4, characterized in that: The film placement platform is provided with at least one positioning groove, and a limiting column is arranged in the corresponding positioning groove, and the limiting column is movably connected to the main frame; The plastic film is provided with an opening for engaging with the limiting column. According to the position of plastic films of different sizes on the film placement platform, the limiting column is moved to engage with the opening to limit the plastic film.

6. The in-mold laminating equipment according to claim 5, characterized in that: The first suction cup assembly includes a plate body and a plurality of adjustable suction cups, wherein the adjustable suction cups are movably connected to the plate body, and the plurality of adjustable suction cups are connected by a limiting hose to synchronize the relative positions of the plurality of adjustable suction cups.

7. The in-mold laminating equipment according to any one of claims 2 to 6, characterized in that: The film taking mechanism further comprises a roller and a leg, wherein the leg is connected to the main frame in a telescopic and adjustable manner, and the roller is connected to the main frame; The legs support the main frame, and when the film taking mechanism needs to change position, the legs are retracted, and the rollers touch the ground to support the main frame, so as to drive the film taking mechanism to move through the rollers.

8. A working method of an in-mold laminating device, characterized in that: The working method of the in-mold laminating device is applicable to the in-mold laminating device according to any one of claims 1 to 7, and the working method comprises: Step S1: determining the size of the plastic film to be processed; Step S2: placing the plastic film on the film placement platform, and adjusting the limiting pillars to fit the limiting plastic film according to the size of the plastic film; Step S3: Control the robotic arm assembly to transport the plastic film through the electrostatic generating device to complete electrostatic attachment; Step S4: Control the robot arm assembly to transport the plastic film to the assembly area to complete the stamping and bonding of the plastic film with the surface of the mold to be processed.

9. The working method of the in-mold laminating equipment according to claim 8, characterized in that: The step S3 further comprises: Step S30: According to the material and surface area of ​​the plastic film to be processed, a preset parameter table of the electrostatic generating device is retrieved to determine the corresponding initial value of the electrostatic field strength and the initial speed of the plastic film passing through the electrostatic generating device.

10. The working method of the in-mold laminating equipment according to claim 9, characterized in that: After step S30, the method further includes: Detecting the electrostatic charge density value on the surface of the plastic film after passing through the electrostatic generating device; Determine whether the electrostatic charge density value reaches a preset range; If the judgment is yes, the robot arm assembly is controlled to transport the plastic film to the assembly area; If the judgment is no, the robot arm assembly is controlled to return to the initial position, and the initial value of the electrostatic field strength and the initial speed of the plastic film passing through the electrostatic generating device are adjusted, and then step S3 is repeated.

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