Shell preparation process and system for access control attendance product

Abstract

The invention relates to the technical field of access control attendance products, and particularly discloses a shell preparation process and system for an access control attendance product. The shell preparation process for the access control attendance product comprises the following steps: S1, filling a mold groove with a molten material, and carrying out plasticizing molding, so as to form a first shell; s2, the first shell is conveyed into a positioning groove of a hot-pressing station, and the nut is conveyed into a hot-pressing head on the hot-pressing station; s3, heating the nut to a preset temperature by the hot pressing head, then driving the nut to press downwards, and pressing the nut into a preset hole position in the first shell to form a second shell; and S4, the second shell is conveyed to a stacking station to be stacked. According to the scheme, the step of putting the nut in the shell preparation process is delayed to the step of plasticizing forming, and the safety problem caused by putting the nut before forming can be avoided; in addition, the nut is pressed in in a hot pressing mode after mold forming, the overall operation efficiency can be improved, and automation of the overall technological process is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of access control and attendance products, and in particular to a shell preparation process and system for access control and attendance products. Background Art

[0002] The production process of access control and attendance products, such as fingerprint recognition machines and access control cameras, requires the production of housings and assembly parts. The housings are typically injection-molded from thermoplastic materials, with nuts added to the base during the molding process to securely connect the housing to the nuts. The assembly parts are then connected to the nuts using screws and other fasteners, completing the assembly process.

[0003] Existing injection molding equipment generally includes a base, a pressing seat and an injection molding assembly; the base has a shell mold groove and a positioning column; the pressing seat can be close to or away from the base, and when the pressing seat is pressed on the base, the pressing seat seals the shell mold groove; the injection molding assembly is connected to the shell mold groove, and can inject thermoplastic material into the shell mold groove so that the material is molded in the shell mold groove.

[0004] During the operation, the staff first needs to place the nuts one by one in the positioning columns, then press the press seat onto the injection molding base, and finally the injection molding assembly injects thermoplastic material into the shell mold groove, so that the thermoplastic material and the nut are combined into one.

[0005] In this method, workers manually place the nuts, which poses a safety risk and has low work efficiency. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide a shell preparation process and system for access control and attendance products, which is used to solve the problems of low efficiency and safety risks in the existing shell preparation process of access control and attendance products.

[0007] To achieve the above technical objectives, the first aspect of the present application provides a shell preparation process for an access control and attendance product, comprising:

[0008] S1, filling the molten material into the mold groove and plasticizing and molding to form a first shell;

[0009] S2, conveying the first shell to the positioning groove of the hot pressing station, and conveying the nut to the hot pressing head on the hot pressing station;

[0010] S3, the hot pressing head heats the nut to a preset temperature and then drives the nut downward to press the nut into a preset hole in the first shell to form a second shell;

[0011] S4. Transfer the second shell to a stacking station for stacking.

[0012] Furthermore, before step S1, the following steps are also included:

[0013] S01, cutting the rod into a cylinder with a preset diameter and a preset length;

[0014] S02, cutting the outer periphery of the top of the rod to form a top annular notch;

[0015] S03, machining an inner hole for the rod and machining an internal thread in the inner hole to form the nut.

[0016] Furthermore, after step S02 and before step S03, the following steps are further included:

[0017] S021. Cutting the outer periphery of the bottom of the rod to form a bottom annular notch.

[0018] Furthermore, after step S02 and before step S03, the following steps are further included:

[0019] S022. Processing a first external thread segment and a second external thread segment on the outer periphery of the rod, wherein the thread directions of the first external thread segment and the second external thread segment are opposite.

[0020] Furthermore, before step S1, the method further includes:

[0021] S04, subjecting the plastic particles to hot air circulation drying treatment until the moisture content of the plastic particles is less than 0.02%, and then feeding them into the melting component to form the molten material.

[0022] Furthermore, the step S1 is specifically as follows:

[0023] After the molten material is filled into the mold groove using a first preset pressure, the pressure in the mold groove is maintained at a second preset pressure for a preset time, so that the molten material is plasticized and formed into a first shell, wherein the second preset pressure is 50% to 80% of the first preset pressure.

[0024] Furthermore, after step S1 and before step S2, the method further includes:

[0025] S11, sending the first shell to a trimming mechanism for gate cutting.

[0026] The second aspect of the present application provides a shell preparation system for an access control and attendance product, comprising: a hot melt component, a loading and unloading component, a conveying component, a nut processing component, a nut conveying component, a hot pressing component, and a stacking component;

[0027] The hot melt assembly is provided with a material storage mechanism, a pressing table and a pressing block;

[0028] The pressing table is provided with a mold groove;

[0029] The pressing block is movably arranged on the pressing table, and is used for pressing and sealing the mold groove;

[0030] The material storage mechanism is connected to the mold tank and is used to store molten material and to transport the molten material to the mold tank;

[0031] The pressing platform is provided with an ejector for ejecting the first shell;

[0032] The loading and unloading assembly is arranged between the pressing table and the conveying assembly, and is used to transfer the first shell to the conveying assembly;

[0033] The conveying assembly is used to transport the first shell to the positioning groove of the hot pressing assembly;

[0034] The nut processing assembly is used to process nuts;

[0035] The nut conveying assembly is used to convey the nuts to the hot pressing head of the hot pressing assembly;

[0036] The hot pressing assembly is used to heat the nut through the hot pressing head and then drive the hot pressing head to press the nut down into the first shell to form a second shell;

[0037] The stacking assembly is used to stack the second shells in a storage box.

[0038] Furthermore, the loading and unloading assembly is a multi-axis manipulator.

[0039] Furthermore, the loading and unloading assembly includes a multi-axis robotic arm, a suction cup clamp and a flexible clamp;

[0040] The multi-axis robotic arm is detachably connected to the suction cup clamp or the flexible clamp.

[0041] It can be seen from the above technical solutions that the present application provides a shell preparation process and system for access control and attendance products; wherein, the shell preparation process for access control and attendance products includes: S1, filling the molten material into the mold groove and plasticizing to form a first shell; S2, conveying the first shell to the positioning groove of the hot pressing station, and conveying the nut to the hot pressing head on the hot pressing station; S3, the hot pressing head heats the nut to a preset temperature and then drives the nut to press down, pressing the nut into the preset hole position in the first shell to form a second shell; S4, transferring the second shell to the stacking station for stacking.

[0042] In this solution, the step of inserting the nut during the shell preparation process is postponed to after the plasticizing and molding step, which can avoid the safety problems caused by inserting the nut before molding; and, pressing the nut by hot pressing after the mold is formed can improve the overall operation efficiency and contribute to the automation of the overall process. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 A flowchart of a shell preparation process for an access control and attendance product provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of the process for preparing a shell for an access control and attendance product provided in an embodiment of the present application;

[0046] Figure 3 A flowchart of a shell preparation process for an access control and attendance product provided in another embodiment of the present application;

[0047] Figure 4 A side view of a nut used in a shell preparation process for an access control and attendance product provided in an embodiment of the present application;

[0048] Figure 5 A schematic diagram of a housing preparation system for an access control and attendance product provided in an embodiment of the present application;

[0049] In the picture:

[0050] 1. Nut; 101. Top annular notch; 102. Bottom annular notch; 103. First external thread segment; 104. Second external thread segment;

[0051] 10. Hot melt assembly; 11. Material storage mechanism; 12. Pressing table; 13. Pressing block;

[0052] 20. Loading and unloading components;

[0053] 30. Conveyor assembly; 31. First conveyor belt; 32. First manipulator; 33. Second manipulator;

[0054] 40. Nut conveying assembly; 41. Second conveyor belt; 42. Nut vibration screening mechanism;

[0055] 50. Hot pressing assembly; 51. Hot pressing head; 52. Positioning groove;

[0056] 60. Stacking components;

[0057] 70. Cache area;

[0058] 80. Trimming mechanism. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions of the embodiments of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection requested by this application.

[0060] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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 operate in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0061] In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, replaceable connections, or integral connections. They can also refer to mechanical connections or electrical connections. They can also refer to direct connections or indirect connections through an intermediate medium. They can also refer to internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0062] See also Figure 1 and Figure 2 In a first aspect, embodiments of the present application provide a process for manufacturing housings for access control and attendance products. This process can be used to produce housings for access control and attendance products such as fingerprint recognition devices and access control cameras. This process can improve product production efficiency, reduce operator involvement, and thus enhance operational safety.

[0063] In this embodiment, the shell preparation process includes the following steps:

[0064] S1, filling the molten material into the mold groove and plasticizing and molding to form a first shell;

[0065] S2, conveying the first shell to the positioning groove of the hot pressing station, and conveying the nut to the hot pressing head on the hot pressing station;

[0066] S3, the hot pressing head heats the nut to a preset temperature and then drives the nut downward to press the nut into a preset hole in the first shell to form a second shell;

[0067] S4. Transfer the second shell to the stacking station for stacking.

[0068] In step S1, the process of melting the plasticized material to form a molten material can be accomplished by an injection molding machine. The injection molding machine may include an injection assembly, a clamping assembly, a hydraulic assembly, and an electrical control assembly. The injection assembly heats the raw material (plastic) to form a molten material, then injects the molten material into the mold cavity of the clamping assembly. After the clamping assembly closes the mold, the material is plasticized and formed. During use, the injection assembly can control its injection temperature and pressure.

[0069] In this embodiment, the injection assembly can be heated in sections. Specifically, the barrel is divided axially into multiple sections, including a feed section, a compression section, and a discharge section. Each section is equipped with an independent heating and temperature control mechanism. The temperature range of the feed section is configured to be 130°C to 200°C; the temperature range of the compression section is configured to be 200°C to 240°C; and the temperature of the discharge section is configured to be 240°C to 300°C. Segmented heating can avoid local overheating and improve the uniformity of the molten material. During the injection process, the screw back pressure within the injection assembly can be maintained at 0.5-3MPa.

[0070] In this embodiment, the injection assembly can use multi-stage injection. Specifically, the injection process is divided into multiple time periods, such as a rapid filling stage, a slow filling stage, and a pressure holding stage, and different injection pressures are used in different time periods. Specifically, during the rapid filling stage, the injection pressure of the injection assembly can be 100-150 MPa to quickly inject the molten material into the mold cavity. During the slow filling stage, the injection pressure is reduced to 60-100 MPa to reduce the filling speed and reduce pressure fluctuations within the mold cavity. During the pressure holding stage, the injection pressure is maintained at 50% to 80% of the low-pressure filling stage for a preset duration. In practice, the preset duration can be 5-30 seconds.

[0071] As an implementation method, the detailed process of the above step S1 may be:

[0072] After the molten material is filled into the mold cavity at a first preset pressure, the pressure in the mold cavity is maintained at a second preset pressure for a preset time, allowing the molten material to plasticize and form the first shell. The second preset pressure is 50% to 80% of the first preset pressure. The first preset pressure is the injection pressure during the low-speed filling phase, i.e., 60-100 MPa; the second preset pressure is the pressure during the holding phase. The preset time is the same as above, 5-30 seconds.

[0073] Multi-stage injection can improve molding quality and reduce product defects. At the same time, the existing mold temperature control mechanism can be used in conjunction with the pressure holding stage to achieve volume compensation for the product in the mold cavity.

[0074] In step S2, the process of transporting the first shell to the positioning groove can be completed by a multi-axis robot in conjunction with a conveyor belt. Specifically, the mold assembly is provided with an ejection mechanism that can eject the formed first shell. The first multi-axis robot then grasps the first shell and places it on a transfer mechanism such as a conveyor belt, which transports it to the unloading area. In this embodiment, the unloading area can be located at the end of the conveyor belt. After that, the second multi-axis robot grasps the first shell in the stacking area and moves it to the buffer area. A third multi-axis robot, in conjunction with a visual positioning system, grasps the first shell in the buffer area and moves it to the positioning groove of the hot pressing station.

[0075] In step S2, the nut transportation process can be completed by a conveyor belt; specifically, the conveyor belt transports the nuts to a vibrating screening machine, which screens the nuts so that the nuts with vertical axes fall into the conveying pipe and are transported to the hot pressing head through the conveying pipe.

[0076] In this embodiment, the positioning groove of the hot pressing station can be used for the first shell to be placed and clamped in position.

[0077] In this embodiment, the vibrating screening machine can be a conventional screening machine. It uses electromagnetic or mechanical vibration to move the nuts within the disc upward along a spiral track. Nuts positioned in a desired orientation (e.g., horizontally axially) are transported into the delivery tube. Nuts in other orientations (e.g., vertically axially) will fall from the spiral track due to unstable center of gravity. The delivery tube has a diameter slightly larger than the nut, enabling it to transport the nut while maintaining its axis parallel to the tube's axis until the nut is delivered to the hot pressing head in the desired orientation.

[0078] In step S3 , the nut is heated in the hot pressing head to a temperature of 100 to 400° C., which can be adjusted according to the material of the first shell.

[0079] In step S3, after the first shell is plasticized and formed, it is provided with pre-set holes. The heated nut can be pressed into the pre-set holes. After cooling, the nut and the first shell are integrated. This method of connecting the nut and the first shell eliminates the need for workers to manually place the nut in the equipment, improving operational safety and production efficiency.

[0080] In step S4 , the second shell can be unloaded by the fourth multi-axis robot, and the second shell can be stacked at the stacking station by the fourth multi-axis robot.

[0081] As an implementation manner, the fourth multi-axis manipulator and the third multi-axis manipulator may be the same manipulator.

[0082] In a further improved embodiment, see Figure 3 and Figure 4 , before step S1, further comprising:

[0083] S01, cutting the rod into a cylinder with a preset diameter and a preset length;

[0084] S02, cutting the outer periphery of the top of the rod to form a top annular notch;

[0085] S03. Processing an inner hole for the rod and processing an internal thread in the inner hole to form a nut.

[0086] In this embodiment, the rod may be a brass rod, which has good thermal conductivity, and the preset diameter may be 4.5±0.1 mm; the preset length may be 3.5±0.1 mm.

[0087] In step S02, the top of the rod refers to the side away from the first shell during the process of being pressed into the first shell. Specifically, the nut is pressed into the first shell from top to bottom, so the side of the nut away from the first shell is its top.

[0088] In this embodiment, the nut 1 formed after processing can be Figure 4 As shown, a top annular notch 101 is formed on the top periphery of the nut 1. Specifically, after the nut 1 is pressed into the first housing, the heated nut melts the first housing and gradually presses into the first housing. After the nut 1 is pressed into place, as the nut 1 cools, the relative position between the nut 1 and the first housing is fixed.

[0089] During use, the inventors discovered that the material melted and re-solidified by the nut 1 would cover the top surface of the nut 1. Therefore, the top annular notch 101 machined in this embodiment can accommodate this portion of melted material that flows into the top surface of the nut 1, preventing the solidified material from forming a bulge on the top surface of the first shell.

[0090] In one embodiment, after step S02 and before step S03, the method further includes:

[0091] S021. Cut the outer periphery of the bottom of the rod to form a bottom annular notch.

[0092] See also Figure 4 In this embodiment, in addition to the top annular notch 101 at the top, the bottom annular notch 102 located at the bottom periphery of the nut 1 can facilitate the nut 1 to be pressed into the first shell, reducing the pressure resistance; at the same time, after the nut 1 is pressed in, the top and bottom of the nut 1 form a limited fit with the solidified shell material, thereby improving the stability of the nut 1 after installation.

[0093] In one embodiment, after step S02 and before step S03, the method further includes:

[0094] S022. Process a first external thread segment and a second external thread segment on the outer periphery of the rod, wherein the thread directions of the first external thread segment and the second external thread segment are opposite.

[0095] See also Figure 4 The first and second externally threaded segments 103, 104 formed on the nut 1 can be arranged vertically. After the nut 1 is pressed into the first housing, the outer threads increase friction between the two, thereby enhancing the bond strength. Furthermore, the first and second externally threaded segments 103, 104, with opposite threads, prevent the nut 1 from loosening due to vibration or other factors during use.

[0096] In one embodiment, before step S1, the method further includes:

[0097] S04. The plastic particles are dried by hot air circulation until the moisture content of the plastic particles is less than 0.02%, and then fed into a melting component to form a molten material.

[0098] In practical applications, the hot air circulation drying process can be performed by a hot air circulation component. The hot air circulation component can be set in a storage box for storing raw materials and can continuously deliver hot air into the storage box.

[0099] The hot air circulation drying process can ensure that the moisture content of the rate particles meets the requirements, improve the quality of the subsequent molten material, reduce bubbles and impurities, and thus improve the overall strength of the first shell.

[0100] Furthermore, after step S1 and before step S2, the method further includes:

[0101] S11, sending the first shell to the trimming mechanism for gate cutting.

[0102] In this embodiment, the trimming mechanism may include a fixed base and a movable trimming blade. After removing the first shell from the mold assembly, the first multi-axis mechanical axis places it on the fixed base, which secures the first shell. The trimming blade then moves along a predetermined path, precisely removing the gate portion of the first shell to ensure a smooth edge. The fixed base may secure the first shell, for example, by mechanical clamping or by providing a slot that matches the shape of the first shell, ensuring that the shell remains stable and does not move during the trimming process.

[0103] The second aspect of this application provides a shell preparation system for access control and attendance products. Figure 5 , which includes: a hot melt assembly 10, a loading and unloading assembly 20, a conveying assembly 30, a nut processing assembly, a nut conveying assembly 40, a hot pressing assembly 50 and a stacking assembly 60;

[0104] The hot melt assembly 10 is provided with a material storage mechanism 11, a pressing platform 12 and a pressing block 13;

[0105] A mold groove is provided on the pressing table 12; a pressing block 13 is movably provided on the pressing table 12 for pressing and sealing the mold groove; a material storage mechanism 11 is connected to the mold groove for storing molten material and for transporting the molten material to the mold groove; an ejector for ejecting the first shell is provided in the pressing table 12.

[0106] The material storage mechanism 11 serves as an injection assembly, heating plastic pellets, storing molten material, and injecting the molten material into the mold cavity of the pressing table 12. The pressing table 12 and the pressing block 13 constitute the mold clamping assembly. In use, the pressing block 13 can be pressed against the pressing table 12 either horizontally or vertically.

[0107] As an embodiment, a conformal cooling groove is provided on the periphery of the mold tank. After the pressure holding stage in the above process, the cooling assembly within the hot melt assembly 10 injects coolant into the conformal cooling groove to rapidly cool and shape the molten material. The conformal cooling groove is oriented to match the shape of the first shell, allowing the coolant flowing along the conformal cooling groove to flow around the periphery of the first shell.

[0108] The loading and unloading assembly 20 is disposed between the pressing platform 12 and the conveying assembly 30 , and is used to transfer the cooled first shell to the conveying assembly 30 .

[0109] In an embodiment including a trimming mechanism 80 , the loading and unloading assembly 20 may first transfer the first shell to the trimming mechanism 80 for trimming, and then transfer the trimmed first shell to the conveying assembly 30 .

[0110] As an embodiment, the trimming mechanism 80 may include a fixed base and a trimming blade. The fixed base is provided with an openable and closable fixing clamp to fix the first housing through the fixing clamp, and then the trimming blade rotates and moves along a preset path to accurately cut away the excess portion of the housing.

[0111] In one embodiment, the loading and unloading assembly 20 can be a multi-axis robot. The loading and unloading assembly includes a multi-axis robot arm, a suction cup gripper, and a flexible gripper. The multi-axis robot arm is detachably connected to the suction cup gripper or the flexible gripper. In actual use, personnel can select different grippers based on the shape of the first shell. For example, for a flat first shell, a suction cup gripper can be used; for a first shell with a predominantly irregular outer surface, a flexible gripper can be used.

[0112] In one embodiment, the conveyor assembly 30 may be a combination of a conveyor belt and a manipulator. For example, in this embodiment, the conveyor assembly 30 includes a first conveyor belt 31, a first manipulator 32, and a second manipulator 33. The loading and unloading assembly 20 transfers the first shell onto the first conveyor belt 31, which then transfers the first shell to the unloading area. The first manipulator 32 then transfers the first shell from the unloading area to the buffer area 70. The second manipulator 33 then transfers the first shell from the buffer area 70 to the positioning slot 52 of the hot pressing assembly 50.

[0113] The nut processing assembly is used to process nuts. In this embodiment, the nut processing assembly is not shown; it can utilize conventional nut processing tools, specifically those capable of cutting, drilling, and processing internal and external threads on bar material. In this embodiment, the difference is that, while the aforementioned nut having one or more of the top annular notch 101, the bottom annular notch 102, the first externally threaded segment 103, and the second externally threaded segment 104 is employed, one or more of the following steps are added to the nut production process: a top peripheral cutting step, a bottom peripheral cutting step, a first-direction external threading step, and a second-direction external threading step.

[0114] In application, nut processing components and other combinations can be set up in different workshops.

[0115] The nut conveying assembly 40 is used to convey nuts to the hot pressing head 51 of the hot pressing assembly 50 .

[0116] As an embodiment, the nut conveying assembly 40 may include a second conveyor belt 41 and a nut vibrating screening mechanism 42. The second conveyor belt 41 connects the nut processing assembly and the nut vibrating screening mechanism 42, and can convey the processed nuts to the nut vibrating screening mechanism 42.

[0117] The nut vibration screening mechanism 42 can select an existing mechanism, which can screen the posture of nuts by vibration, so that nuts that meet the preset posture can be transported to the hot pressing head 51 through the internal conveying pipe, and nuts that do not meet the preset posture fall off with the vibration.

[0118] The hot pressing assembly 50 is used to heat the nut through the hot pressing head 51 and then drive the hot pressing head 51 to press the nut down into the first shell to form a second shell.

[0119] As an embodiment, the hot pressing head 51 can be set on the hot pressing assembly 50 through the existing translation mold and lifting module, so that it can move in the vertical direction to drive the nut to press, and can move in the horizontal direction to align with the first shell.

[0120] The stacking assembly 60 is used to stack the second housings in a storage box.

[0121] In this embodiment, the stacking assembly 60 can be stacked by a stacking robot, specifically stacking the second shells in a storage box.

[0122] As an implementation manner, the stacking robot may be the second robot 33 mentioned above.

[0123] Specifically, the hot pressing assembly 50 is provided with a plurality of positioning slots 52. After the second manipulator 33 transfers a first shell from the buffer area 70 to one of the positioning slots 52 of the hot pressing assembly 50, it can retrieve a new first shell and place it in another positioning slot 52. After the first shell in a positioning slot 52 is combined with a nut to form a second shell, the second manipulator 33 removes the second shell from the positioning slot and places it in a storage box, thereby stacking the second shells.

[0124] The above are only preferred embodiments of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the aforementioned examples or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A shell preparation process for access control and attendance products, characterized in that: include: S1, filling the molten material into the mold groove and plasticizing and molding to form a first shell; S2, conveying the first shell to the positioning groove of the hot pressing station, and conveying the nut to the hot pressing head on the hot pressing station; S3, the hot pressing head heats the nut to a preset temperature and then drives the nut downward to press the nut into a preset hole in the first shell to form a second shell; S4. Transfer the second shell to a stacking station for stacking.

2. The shell preparation process for access control and attendance products according to claim 1 is characterized in that: Before step S1, the method further includes: S01, cutting the rod into a cylinder with a preset diameter and a preset length; S02, cutting the outer periphery of the top of the rod to form a top annular notch; S03, machining an inner hole for the rod and machining an internal thread in the inner hole to form the nut.

3. The shell preparation process for access control and attendance products according to claim 2 is characterized in that: After step S02 and before step S03, the following steps are further included: S021. Cutting the outer periphery of the bottom of the rod to form a bottom annular notch.

4. The shell preparation process for access control and attendance products according to claim 2 or 3, characterized in that: After step S02 and before step S03, the method further includes: S022. Processing a first external thread segment and a second external thread segment on the outer periphery of the rod, wherein the thread directions of the first external thread segment and the second external thread segment are opposite.

5. The shell preparation process for access control and attendance products according to claim 1 is characterized in that: Before step S1, the method further includes: S04, subjecting the plastic particles to hot air circulation drying treatment until the moisture content of the plastic particles is less than 0.02%, and then feeding them into the melting component to form the molten material.

6. The shell preparation process for access control and attendance products according to claim 1 is characterized in that: The step S1 is specifically as follows: After the molten material is filled into the mold groove using a first preset pressure, the pressure in the mold groove is maintained at a second preset pressure for a preset time, so that the molten material is plasticized and formed into a first shell, wherein the second preset pressure is 50% to 80% of the first preset pressure.

7. The shell preparation process for access control and attendance products according to claim 1 or 6, characterized in that: After step S1 and before step S2, the method further includes: S11, sending the first shell to a trimming mechanism for gate cutting.

8. A shell preparation system for access control and attendance products, characterized in that: include: Hot melt assembly, loading and unloading assembly, conveying assembly, nut processing assembly, nut conveying assembly, hot pressing assembly and stacking assembly; The hot melt assembly is provided with a material storage mechanism, a pressing table and a pressing block; The pressing table is provided with a mold groove; The pressing block is movably arranged on the pressing table, and is used for pressing and sealing the mold groove; The material storage mechanism is connected to the mold tank and is used to store molten material and to transport the molten material to the mold tank; The pressing platform is provided with an ejector for ejecting the first shell; The loading and unloading assembly is arranged between the pressing table and the conveying assembly, and is used to transfer the first shell to the conveying assembly; The conveying assembly is used to transport the first shell to the positioning groove of the hot pressing assembly; The nut processing assembly is used for processing nuts; The nut conveying assembly is used to convey the nuts to the hot pressing head of the hot pressing assembly; The hot pressing assembly is used to heat the nut through the hot pressing head and then drive the hot pressing head to press the nut down into the first shell to form a second shell; The stacking assembly is used to stack the second shells in a storage box.

9. The shell preparation system for access control and attendance products according to claim 8, characterized in that: The loading and unloading assembly is a multi-axis manipulator.

10. The shell preparation system for access control and attendance products according to claim 9, characterized in that: The loading and unloading assembly includes a multi-axis robotic arm, a suction cup gripper and a flexible gripper; The multi-axis robotic arm is detachably connected to the suction cup clamp or the flexible clamp.

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