A protective cover automatic hemming device and an automatic hemming method

Abstract

The present invention discloses a protective cover automatic curling device and an automatic curling method, which relate to the technical field of protective cover preparation. The protective cover is positioned on a workbench; a curling mechanism is used to perform a top-pressure type inward curling on the peripheral edge of the border of the protective cover; during curling, a heating mechanism heats the part of the protective cover that is curled by the curling mechanism, so that the corresponding part is heated and deformed into the required curl; after the protective cover is heated and deformed, a cooling mechanism cools the protective cover, so that the protective cover obtains a formed curl, and the peripheral edge of the border of the protective cover can maintain the shape after curling. This process is mainly obtained by bending the peripheral edge of the border of the protective cover. After cooling and forming by the cooling mechanism, a curl with less burr can be obtained. To a certain extent, the burr of the curl can be basically zero; through the protective cover automatic curling device and the protective cover automatic curling method of the present invention, the curling of the border of the protective cover can be prepared without burr or with low burr.

Description

Technical Field

[0001] The present invention relates to the technical field of protective cover preparation, and specifically to an automatic edge curling device and method for a protective cover. Background Art

[0002] As Figure 8 shown, the structure of the existing mobile phone protective cover (100) generally includes a back plate (1002) and a frame (1003). When in use, the mobile phone protective cover is put on a mobile phone of a corresponding model. The back plate (1002) is used to cover the back of the mobile phone, and the frame (1003) is used to protect the frame of the mobile phone. In order to make the mobile phone protective cover not easy to fall off after being put on the mobile phone, a curled edge that bends inward at a certain angle is formed on the periphery (1001) of the frame. After the mobile phone protective cover is put on the mobile phone, the curled edge can position the mobile phone, making it not easy for the mobile phone protective cover to separate from the mobile phone. And during use, the curled edge can also prevent dust and debris from entering between the mobile phone protective cover and the mobile phone.

[0003] Currently, the method for preparing such mobile phone protective covers with curled edges is mostly injection molding. The molds used in injection molding are mostly the "rear mold and injection mold" disclosed in the Chinese utility model with the patent number 202120400012.9. During injection molding, the curled edge of the frame of the mobile phone protective cover is injection molded through a lifter mold. After injection molding, the lifter mold is removed to facilitate the demolding of the mobile phone protective cover. During injection molding, the lifter mold can only be used to mold the outer side of the frame and the curled edge, and multiple lifters (which extend from the mold core during mold closing and are used to mold the inner side of the frame and the curled edge during injection molding) are required for the inner side of the frame and the curled edge (the side corresponding to the mobile phone). If the inner side of the curled edge is molded by the lifter method, too many seams are the main reason for more flash at the curled edge after the mobile phone protective cover is molded. Therefore, usually, the curled edge of the mobile phone protective cover needs to be deburred after injection molding. If the deburring is not done well, it is easy to have flash residue or curled edge cracking.

[0004] If the curled edge is not prepared and only the back plate and the frame are hot-pressed, correspondingly, problems such as the easy detachment of the mobile phone protective cover and the easy entry of dust and debris into the mobile phone protective cover and the mobile phone need to be faced, which is one of the main reasons for the poor user experience. Therefore, it is necessary to invent an automatic edge curling device and method for a protective cover that can perform burr-free or low-burr edge curling on a mobile phone protective cover without a curled edge after hot pressing. Summary of the Invention

[0005] The present invention aims to provide a technical solution for an automatic edge curling device and method for a protective cover that can solve the above problems to overcome the above deficiencies.

[0006] To achieve the above object, the present invention provides the following technical solutions: An automatic edge curling method for a protective cover, comprising the following steps:

[0007] S1. Position the protective cover on the workbench;

[0008] S2. Perform a pressing-type inner edge curling on the peripheral edge of the border of the protective cover through an edge curling mechanism;

[0009] S3. During edge curling, heat the part of the protective cover that is being edge curled by the edge curling mechanism through a heating mechanism, so that the corresponding part is deformed by heat into the required edge curl;

[0010] S4. After heating and deforming the protective cover, cool the protective cover through a cooling mechanism, so that the protective cover obtains a formed edge curl.

[0011] As a further solution of the present invention: The edge curling mechanism includes an edge curling plate and a pressing mechanism for driving the edge curling plate. Among them, the pressing end of the pressing mechanism is connected to the edge curling plate, and the pressing mechanism drives the edge curling plate to press towards / away from the peripheral edge of the border of the protective cover positioned on the workbench; the edge curling plate has an arc-shaped part corresponding to the peripheral edge of the border of the protective cover positioned on the workbench.

[0012] As a further solution of the present invention: The cooling mechanism supplies cold to the edge curling plate, and cools the protective cover after heat conduction through the edge curling plate.

[0013] As a further solution of the present invention: The heating mechanism supplies heat to the edge curling plate, and heats the protective cover after heat conduction through the edge curling plate.

[0014] As a further solution of the present invention: The heating process of the heating mechanism for the edge curling plate includes a first heating stage, a second heating stage, and a third heating stage; during the first heating stage, the edge curling plate is in an un-pressed state where it does not press the peripheral edge of the border of the protective cover; during the second heating stage, the edge curling plate is in a pressing and curling state where it gradually presses and curls the peripheral edge of the border of the protective cover; during the third heating stage, the edge curling plate is in a holding and shaping state after pressing and curling the peripheral edge of the border of the protective cover.

[0015] As a further solution of the present invention: Under the heating of the heating mechanism, the temperature T1 reached by the edge curling plate in the first heating stage < the temperature T2 reached by the edge curling plate in the second heating stage < the temperature T3 reached by the edge curling plate in the third heating stage.

[0016] As a further solution of the present invention: The heating temperature t1 of the heating mechanism for the edge curling plate in the first heating stage < the heating temperature t2 of the heating mechanism for the edge curling plate in the second heating stage < the heating temperature t3 of the heating mechanism for the edge curling plate in the third heating stage.

[0017] The present invention also provides an automatic hemming device for a protective cover, which includes a machine body, on which a workbench is provided; a positioning mechanism for positioning the protective cover on the workbench; a hemming mechanism for performing a pressing-type inward hemming on the peripheral edge of the border of the protective cover positioned on the workbench; the hemming mechanism includes a hemming plate and a pressing mechanism installed on the machine body, the pressing end of the pressing mechanism is connected to the hemming plate, and the pressing mechanism drives the hemming plate to make the hemming plate press towards / away from the peripheral edge of the border of the protective cover positioned on the workbench, and the hemming plate has an arc portion corresponding to the peripheral edge of the border of the protective cover positioned on the workbench; a heating mechanism for supplying heat to the hemming plate and heating the protective cover through heat conduction of the hemming plate; a cooling mechanism for supplying cold to the hemming plate and cooling the protective cover through heat conduction of the hemming plate.

[0018] As a further aspect of the present invention: A positioning groove for pre-positioning the protective cover is formed on the workbench; the positioning mechanism includes a lifting assembly installed above the positioning groove, and a positioning pressing block corresponding to the protective cover on the positioning groove is connected to the lifting end of the lifting assembly.

[0019] As a further aspect of the present invention: The hemming plate includes a first hemming plate for longitudinally pressing the border of the protective cover and a second hemming plate for transversely pressing the border of the protective cover. Among them, there are two opposite first hemming plates, and two opposite second hemming plates; the pressing mechanism is a linkage driving mechanism; the pressing mechanism includes a motor screw rod assembly installed on the machine body. Among them, the motor screw rod assembly has sliders corresponding to the two first hemming plates respectively. When the motor screw rod rotates in one direction, the two sliders of the motor screw rod assembly move towards or away from each other; the pressing mechanism further includes two guide rail slider assemblies corresponding to the two second hemming plates respectively. Among them, the two second hemming plates are respectively connected to the sliders of the two guide rail slider assemblies, and the guide rail slider assemblies are installed on the machine body and enable the second hemming plates to move transversely relative to the machine body; a linkage rod is provided between the first hemming plate and the second hemming plate, one end of the linkage rod is hinged to the first hemming plate, and the other end of the linkage rod is hinged to the second hemming plate.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: By means of the pressing-type inward hemming of the peripheral edge of the border of the protective cover by the hemming mechanism and the heating of the protective cover by the heating mechanism, the peripheral edge of the border of the protective cover can maintain the shape after hemming after being pressed and hemmed. This process is mainly obtained by bending the peripheral edge of the border of the protective cover. After cooling and forming by the cooling mechanism, a hemming with less burr can be obtained. To a certain extent, the burr of the hemming can be basically zero; Through the automatic hemming device and method for the protective cover, the hemming of the border of the protective cover can be prepared without burr or with low burr. Description of the Drawings

[0021] Figure 1 is the three-dimensional structure diagram of the present invention;

[0022] Figure 2 is another three-dimensional structure diagram of the present invention;

[0023] Figure 3 is the three-dimensional structure diagram of the curling mechanism in the present invention;

[0024] Figure 4 is the three-dimensional structure diagram of the workbench in the present invention;

[0025] Figure 5 is the three-dimensional structure diagram after the protective cover and the curling plate are matched in the present invention;

[0026] Figure 6 is the cross-sectional structure diagram after the protective cover and the curling plate are matched in the present invention;

[0027] Figure 7 is the process schematic diagram of the automatic curling method of the protective cover in the present invention;

[0028] Figure 8 is the structure diagram of the protective cover in the prior art.

[0029] The reference numerals and names in the figures are as follows:

[0030] Machine body - 1,

[0031] Workbench - 2, positioning groove - 21,

[0032] Positioning mechanism - 3, lifting component - 31, positioning pressing block - 32,

[0033] Curling mechanism - 4, curling plate - 41, first curling plate - 41a, second curling plate - 41b, pressing mechanism - 42, motor screw component - 421, slider of the motor screw component - 4211, screw of the motor screw component - 4212, guide rail of the motor screw component - 4213, guide rail slider component - 422, linkage rod - 423, arc part - 43,

[0034] Heating mechanism - 5, heating element of the heating mechanism - 51,

[0035] Cooling mechanism - 6, liquid cooling pipeline - 61,

[0036] Displacement mechanism - 7,

[0037] Protective cover - 100, peripheral edge of the frame of the protective cover - 1001, back plate of the protective cover - 1002, frame of the protective cover - 1003. Detailed implementation mode

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figures 1-7 , an automatic hemming device for a protective cover, including a machine body 1, on which there are a workbench 2, a positioning mechanism 3, a hemming mechanism 4, a heating mechanism 5 and a cooling mechanism 6.

[0040] The positioning mechanism 3 is used to position the protective cover 100 on the workbench 2. The hemming mechanism 4 is used to perform a pressing-type inner hemming on the peripheral edge 1001 of the border of the protective cover 1 positioned on the workbench 2. The hemming mechanism 4 includes a hemming plate 41 and a pressing mechanism 42 installed on the machine body 1. The pressing end of the pressing mechanism 42 is connected to the hemming plate 41. The pressing mechanism 42 drives the hemming plate 41 to make the hemming plate 41 press towards / away from the peripheral edge 1001 of the protective cover positioned on the workbench 2. The hemming plate 41 has an arc-shaped portion 43 corresponding to the peripheral edge 1001 of the protective cover positioned on the workbench 2. The heating mechanism 5 is used to supply heat to the hemming plate 41, and after heat conduction through the hemming plate 41, heat the protective cover 100. The cooling mechanism 6 is used to supply cold to the hemming plate 41, and after cold conduction through the hemming plate 41, cool the protective cover 100.

[0041] The method for automatically hemming the protective cover by this automatic hemming device for the protective cover includes the following steps:

[0042] S1. Position the protective cover on the workbench;

[0043] S2. Perform a pressing-type inner hemming on the peripheral edge of the protective cover through the hemming mechanism;

[0044] S3. During hemming, heat the part of the protective cover that is hemmed by the hemming mechanism through the heating mechanism, so that the corresponding part is heated and deformed into the required hem;

[0045] S4. After heating and deforming the protective cover, cool the protective cover through the cooling mechanism, so that the protective cover obtains a formed hem.

[0046] By means of the hemming mechanism pressing the peripheral edge of the frame of the protective cover in a top-pressing and inward-hemming manner, and heating the protective cover through the heating mechanism, the peripheral edge of the frame of the protective cover can maintain the shape after hemming after being pressed and hemmed. This process is mainly obtained by bending the peripheral edge of the frame of the protective cover. After cooling and forming through the cooling mechanism, a hem with less burr can be obtained. To a certain extent, the burr of the hem can be basically zero. Through the automatic hemming equipment and method of the protective cover, the hemming of the frame of the protective cover can be prepared without burrs or with low burrs.

[0047] In the embodiment of the present invention, a positioning groove 21 for pre-positioning the protective cover 100 is formed on the workbench 2. The positioning mechanism 3 includes a lifting assembly 31 installed on the machine body and located above the positioning groove 21. The lifting end of the lifting assembly 31 is connected with a positioning pressing block 32 corresponding to the protective cover on the positioning groove 21. After the protective cover 100 is placed on the positioning groove 21, the protective cover 100 is pre-positioned flat on the positioning groove 21. After the protective cover 100 is aligned with the positioning pressing block 32, the lifting assembly 31 drives the positioning pressing block 32 to descend to position the protective cover 100 and prevent the protective cover 100 from slipping out of the positioning groove 21. Among them, when the protective cover 100 is aligned with the positioning pressing block 32, the back plate 1002 of the protective cover faces the positioning pressing block 32, and the peripheral edge 1001 of the frame of the protective cover is located above the back plate 1002 of the protective cover. The lifting assembly 31 drives the positioning pressing block 32 to descend, and the positioning pressing block 32 passes through the middle gap of the frame of the protective cover to press and position the back plate 1002 of the protective cover.

[0048] The design of the positioning mechanism 3 enables the protective cover 100 to maintain a fixed state when being pressed and hemmed, avoiding hemming deviation caused by displacement and effectively ensuring the hemming quality.

[0049] The lifting assembly 31 is preferably a cylinder lifting assembly, and its corresponding speed is fast. In other embodiments, the lifting assembly can also be a component with a lifting function such as a motor lifting assembly, an electric push rod lifting assembly, a hydraulic cylinder lifting assembly, etc., which will not be elaborated here one by one.

[0050] In the embodiment of the present invention, as Figure 3 , Figure 5 shown, the frame of the protective cover is arranged in a rectangular shape. The hemming plate includes a first hemming plate 41a for pressing the long side of the frame of the protective cover, and a second hemming plate 41b for pressing the short side of the frame of the protective cover. Among them, two first hemming plates corresponding to the two long sides of the frame of the protective cover are provided on the first hemming plate 41a, and two second hemming plates corresponding to the two short sides of the frame of the protective cover are provided on the second hemming plate 41b.

[0051] The top pressing mechanism 42 is a linkage driving mechanism, which can simultaneously drive the first curling plate 41a and the second curling plate 41b to move towards the direction close to the protective sleeve positioned on the workbench 2, and can also simultaneously drive the first curling plate 41a and the second curling plate 41b to move away from the protective sleeve positioned on the workbench 2.

[0052] For details, please refer to Figure 3 、 Figure 4 Preferably, the top pressing mechanism 42 includes a motor screw assembly 421 installed on the machine body. Among them, the motor screw assembly 42 has sliders 5211 corresponding to the two first curling plates 41a respectively. When the screw 4212 of the motor screw assembly rotates in one direction, the two sliders of the motor screw assembly move towards or away from each other.

[0053] To achieve the reverse movement design of the two sliders of the motor screw assembly, the screw 4212 of the motor screw assembly is placed between the two first curling plates. The two sliders of the motor screw assembly are respectively arranged at both ends of the screw 4212 of the motor screw assembly. The sliders are in threaded fit with the screw. Among them, by setting the reverse thread, when the screw 4212 of the motor screw assembly rotates in one direction, one slider moves forward on the guide rail 4213 of the motor screw assembly, and the other slider moves backward on the guide rail 4213 of the motor screw assembly, realizing the simultaneous top pressing / simultaneous separation of the two first curling plates from the frame of the protective sleeve.

[0054] The top pressing mechanism 42 further includes two guide rail slider assemblies 422 corresponding to the two second curling plates 41b respectively. Among them, the two second curling plates are respectively connected to the sliders of the two guide rail slider assemblies 422. The guide rail slider assemblies 422 are installed on the machine body, and the second curling plate 41b can move left / right relative to the machine body 1.

[0055] A linkage rod 423 is arranged between the first curling plate 41a and the second curling plate 41b. One end of the linkage rod 423 is hinged to the first curling plate 41a, and the other end of the linkage rod 423 is hinged to the second curling plate 41b. Among them, the linkage rod 423 satisfies the following conditions: the rotation direction of the linkage rod relative to the first curling plate is the same as the rotation direction of the linkage rod relative to the first curling plate, and the rotation direction of the linkage rod relative to the first curling plate is parallel to the moving direction of the first curling plate and parallel to the moving direction of the second curling plate.

[0056] When the first curling plate 41a moves towards the direction of top pressing the frame of the protective sleeve, the linkage rod 423 continuously changes its direction, driving the second curling plate 41b to also move towards the direction of top pressing the frame of the protective sleeve.

[0057] The overall design is ingenious. By setting only one motor screw rod assembly, the linkage control of the different-direction movement of multiple components (two first curling plates and two second curling plates) can be achieved. Under the operation purpose of multi-sided top pressing and curling of the protective cover's frame, it can save more drive sources for producers, and the cost can be better controlled.

[0058] Actually, the first curling plate can also be understood as top pressing and curling the periphery of the protective cover's frame longitudinally (the first curling plate moves in the front-back direction correspondingly), and the second curling plate can also be understood as top pressing and curling the periphery of the protective cover's frame transversely (the second curling plate moves in the left-right direction correspondingly).

[0059] Preferably, a linkage rod is arranged between each second curling plate 41b and each first curling plate 41a. With four-sided linkage, it is more stable when driven by the motor screw rod assembly.

[0060] In other embodiments, based on independent control purposes such as time-sharing top pressing and curling, single-side independent top pressing and curling, etc., the top pressing mechanism can be composed of multiple independent driving mechanisms. Each independent driving mechanism can independently drive at least 1 first curling plate or at least 1 second curling plate to move. For example, an independent driving mechanism (such as a motor driving mechanism, an electric push rod driving mechanism, etc.) is equipped for each first curling plate, and an independent driving mechanism (such as a motor driving mechanism, an electric push rod driving mechanism, etc.) is equipped for each second curling plate.

[0061] In the embodiment of the present invention, the heating mechanism 5 supplies heat to the curling plate 41, and heats the protective cover after heat conduction through the curling plate. The heat conduction design for the curling plate 41 can be to fix or closely attach the heating element 51 of the heating mechanism to the curling plate 41, so that the curling plate 41 can be heated.

[0062] The heating element 51 is preferably an electric heating element, which has high controllability of the heating temperature. Based on circuit control, it can generate different temperature values, and can quickly cut off the power supply of the heating element to stop heating before the cooling mechanism 6 conducts heat dissipation for the curling plate 41.

[0063] Furthermore, the heating process of the heating mechanism 5 for the curling plate 41 includes a first heating stage, a second heating stage, and a third heating stage; during the first heating stage, the curling plate is in an un-pressed state where it does not press the periphery of the protective cover's frame; during the second heating stage, the curling plate is in a top pressing and curling state where it gradually presses and curls the periphery of the protective cover's frame; during the third heating stage, the curling plate is in a holding and shaping state after pressing and curling the periphery of the protective cover's frame.

[0064] Under the heating of the heating mechanism 5, the temperature T1 reached by the hemming plate in the first heating stage < the temperature T2 reached by the hemming plate in the second heating stage < the temperature T3 reached by the hemming plate in the third heating stage.

[0065] The steps of automatically hemming the protective sleeve actually include the following steps:

[0066] S1. Position the protective sleeve on the workbench and preheat the hemming plate to temperature T1 through the heating mechanism;

[0067] S2. Perform a top-pressing type inner hemming on the peripheral edge of the border of the protective sleeve through the hemming mechanism;

[0068] S3. During hemming, heat the part of the protective sleeve being hemmed by the hemming mechanism through the heating mechanism, so that the corresponding part is heated and deformed into the required hem. Among them, when the hemming plate gradually performs top-pressing hemming on the peripheral edge of the border of the protective sleeve, the heating mechanism makes the hemming plate reach temperature T2; when maintaining the shape after the hemming plate performs top-pressing hemming on the peripheral edge of the border of the protective sleeve, the heating mechanism makes the hemming plate reach temperature T3;

[0069] S4. After heating and deforming the protective sleeve, cool the protective sleeve through the cooling mechanism so that the protective sleeve obtains a formed hem.

[0070] The setting of temperature T2 satisfies that the peripheral edge of the border of the protective sleeve can be in a state of being heated and softened.

[0071] Temperature T2 is used to make the peripheral edge of the border of the protective sleeve be in a state of being heated and softened, so that when the hemming plate 41 performs top-pressing type inner hemming on the peripheral edge 1001 of the border of the protective sleeve, the peripheral edge 1001 of the softened protective sleeve is less likely to crack during hemming, effectively ensuring the quality of the hem.

[0072] The setting of temperature T3 satisfies that the peripheral edge 1001 of the border of the protective sleeve can be in a state of being heated and deformed. After cooling and forming and after disengaging from the top pressure of the hemming plate 41, the peripheral edge 1001 of the protective sleeve can maintain the hem shape and will not rebound at room temperature.

[0073] Temperature T1 is preferably close to temperature T2, so that when the hemming plate 41 performs top-pressing hemming on the peripheral edge 1001 of the border of the protective sleeve, the heating mechanism 5 can more quickly raise the hemming plate 41 from temperature T1 to temperature T2.

[0074] As one of the temperature control methods: during the first heating stage, the heating mechanism heats the curling plate at temperature t1; during the second heating stage, the heating mechanism heats the curling plate at temperature t2; during the third heating stage, the heating mechanism heats the heating plate at temperature t3. To enable the temperature of the curling plate to rapidly increase from temperature T1 to temperature T2 and from temperature T2 to temperature T3, the relationship among temperature t1, temperature t2, and temperature t3 is preferably t3 > t2 > t1. It should also be understood that under the same heating time, for the temperature of the curling plate to increase from temperature T1 to temperature T2 and from temperature T2 to temperature T3, the relationship among temperature t1, temperature t2, and temperature t3 is t3 > t2 > t1.

[0075] When the heating element 51 of the heating mechanism is an electric heating element (such as an electric heating wire or an electric heating plate), it can be imagined that the electric heating element can be made to increase from temperature t1 to temperature t2 and from temperature t2 to temperature t3 by controlling the current.

[0076] In an embodiment of the present invention, the cooling mechanism 6 cools the curling plate 41, and after the curling plate conducts heat, it cools the protective sleeve. The heat conduction design for the curling plate 41 can be to provide a liquid cooling pipeline 61 on the curling plate 41, and the cooling mechanism 6 passes a coolant through the liquid cooling pipeline 61 so that the curling plate 41 can rapidly cool down.

[0077] The curling plate 41 can simultaneously satisfy: 1) The heating mechanism 5 supplies heat to the curling plate 41, and after the curling plate conducts heat, it heats the protective sleeve; 2) The cooling mechanism 6 cools the curling plate 41, and after the curling plate conducts cold, it cools the protective sleeve. When it is necessary to heat the protective sleeve 100, the heating mechanism 5 supplies heat to the curling plate 41, and the curling plate conducts heat to heat the protective sleeve; when it is necessary to cool the protective sleeve 100, the cooling mechanism 6 cools the curling plate 41, and the curling plate conducts cold to cool the protective sleeve. Using the curling plate 41 closest to the protective sleeve 100 as the temperature conduction medium can, on the one hand, ensure the heating and cooling effects, and on the other hand, save the setting of more heat conduction and cold conduction components.

[0078] In an embodiment of the present invention, for purposes such as safety and limited operating space, a displacement mechanism 7 can also be configured on the machine body 1. The workbench is arranged on the mobile end of the displacement mechanism 7. The displacement mechanism 7 is used to reciprocally move the workbench between the first working area and the second working area, and the pressing mechanism 42 is also arranged on the mobile end of the displacement mechanism 7. The first working area can be used as the area for loading / unloading the protective sleeve, and correspondingly, the second working area can be used as the area where the positioning mechanism positions the protective sleeve, avoiding all components being concentrated in the first working area.

[0079] To enable an automatic hemming device for a protective cover to hem multiple protective covers, at least two workbenches can be provided on the machine body, and corresponding positioning mechanisms, hemming mechanisms, heating mechanisms, cooling mechanisms, and displacement mechanisms can be equipped for them.

[0080] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claimed claim.

Claims

1. An automatic hemming method for a protective cover, characterized in that, It includes the following steps: S1. Position the protective cover on the workbench; S2. Use a hemming mechanism to perform a pressing-type inward hemming on the peripheral edge of the border of the protective cover; S3. During hemming, use a heating mechanism to heat the part of the protective cover where the hemming mechanism performs hemming, so that the corresponding part is heated and deformed into the required hem; S4. After the protective cover is heated and deformed, use a cooling mechanism to cool the protective cover so that the protective cover obtains a formed hem; Among them, the hemming mechanism includes a hemming plate and a pressing mechanism for driving the hemming plate. Among them, the pressing end of the pressing mechanism is connected to the hemming plate, and the pressing mechanism drives the hemming plate to press / away from the peripheral edge of the border of the protective cover positioned on the workbench; the hemming plate has an arc-shaped part corresponding to the peripheral edge of the border of the protective cover positioned on the workbench; the heating mechanism supplies heat to the hemming plate, and heats the protective cover after heat conduction through the hemming plate; the heating process of the heating mechanism for the hemming plate includes a first heating stage, a second heating stage and a third heating stage; during the first heating stage, the hemming plate is in an unpressed state where it does not press the peripheral edge of the border of the protective cover; during the second heating stage, the hemming plate is in a pressing and hemming state where it gradually presses and hems the peripheral edge of the border of the protective cover; during the third heating stage, the hemming plate is in a holding and shaping state after pressing and hemming the peripheral edge of the border of the protective cover.

2. The automatic hemming method of a protective cover according to claim 1, wherein the cooling mechanism supplies cold to the hemming plate, and cools the protective cover after heat conduction through the hemming plate.

3. The automatic hemming method of a protective cover according to claim 1, characterized in that, Under the heating of the heating mechanism, the temperature T1 reached by the hemming plate in the first heating stage < the temperature T2 reached by the hemming plate in the second heating stage < the temperature T3 reached by the hemming plate in the third heating stage.

4. A method for automatically curling the edge of a protective cover according to claim 1 or 3, characterized in that, The heating temperature t1 of the heating mechanism for the hemming plate in the first heating stage < the heating temperature t2 of the heating mechanism for the hemming plate in the second heating stage < the heating temperature t3 of the heating mechanism for the hemming plate in the third heating stage.

5. An automatic hemming device for a protective cover, characterized in that, It includes a machine body, and on the machine body there is a workbench; a positioning mechanism for positioning the protective cover on the workbench; a hemming mechanism for performing a pressing-type inward hemming on the peripheral edge of the border of the protective cover positioned on the workbench; the hemming mechanism includes a hemming plate and a pressing mechanism installed on the machine body, the pressing end of the pressing mechanism is connected to the hemming plate, and the pressing mechanism drives the hemming plate to press / away from the peripheral edge of the border of the protective cover positioned on the workbench, and the hemming plate has an arc-shaped part corresponding to the peripheral edge of the border of the protective cover positioned on the workbench; a heating mechanism for supplying heat to the hemming plate and heating the protective cover after heat conduction through the hemming plate; a cooling mechanism for supplying cold to the hemming plate and cooling the protective cover after heat conduction through the hemming plate; Among them, The heating process of the curling plate by the heating mechanism includes a first heating stage, a second heating stage, and a third heating stage; during the first heating stage, the curling plate is in an un-pressed state where it does not press against the peripheral edge of the protective sleeve; during the second heating stage, the curling plate is in a pressing and curling state where it gradually presses and curls the peripheral edge of the protective sleeve; during the third heating stage, the curling plate is in a state of maintaining the shape after pressing and curling the peripheral edge of the protective sleeve.

6. The automatic curling device for a protective sleeve according to claim 5, wherein A positioning groove for pre-positioning the protective sleeve is formed on the workbench; The positioning mechanism includes a lifting component installed above the positioning groove, and a positioning pressing block corresponding to the protective sleeve in the positioning groove is connected to the lifting end of the lifting component.

7. The automatic curling device for a protective sleeve according to claim 5, wherein The curling plate includes a first curling plate for longitudinally pressing the peripheral edge of the protective sleeve and a second curling plate for transversely pressing the peripheral edge of the protective sleeve. Among them, there are two opposite first curling plates, and there are two opposite second curling plates; The pressing mechanism is a linkage driving mechanism; The pressing mechanism includes a motor screw rod assembly installed on the machine body. Among them, the motor screw rod assembly has sliders corresponding to the two first curling plates respectively. When the motor screw rod rotates in one direction, the two sliders of the motor screw rod assembly move closer to or away from each other; The pressing mechanism further includes two guide rail slider assemblies corresponding to the two second curling plates respectively. Among them, the two second curling plates are respectively connected to the sliders of the two guide rail slider assemblies. The guide rail slider assemblies are installed on the machine body and enable the second curling plates to move transversely relative to the machine body; A linkage rod is provided between the first curling plate and the second curling plate. One end of the linkage rod is hinged to the first curling plate, and the other end of the linkage rod is hinged to the second curling plate.

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