A plastic hot melting device and a hot melting production method of a mobile phone shell lens decoration piece

Abstract

The present application relates to the technical field of intelligent manufacturing equipment, and provides a plastic hot melting equipment and a hot melting production method of a mobile phone shell lens decoration piece. The equipment comprises a servo downward pressing hot melting module, a movable material placing platform, a spacing adjusting mechanism and a carrying mechanism. The servo downward pressing hot melting module realizes closed-loop control of the downward pressing stroke and the hot melting pressure; the movable material placing platform is used for limiting placement and transfer of multi-station base materials; the spacing adjusting mechanism adjusts the height of the material placing platform through jacking to adapt the fixed downward pressing stroke to mobile phone shell base materials of different thicknesses; and the carrying mechanism automatically feeds the decoration piece to a predetermined position of the base material. The hot melting production method comprises an automatic process of base material transfer, decoration piece feeding, spacing adjustment, downward pressing hot melting and reset discharging. The present application overcomes the defects of long changeover time, poor precision and low automation degree of the existing equipment, and improves the flexibility, efficiency and yield of hot melting production of the mobile phone shell lens decoration piece.

Description

Technical Field

[0001] This invention relates to the technical fields of intelligent manufacturing equipment and industrial control software, and in particular to a plastic hot-melt equipment and a hot-melt production method for mobile phone case lens decorative parts. Background Technology

[0002] In the field of intelligent manufacturing assembly and industrial control software design for mobile phone case lens decorative parts, hot-melt technology is typically used to fix the decorative parts to the mobile phone case substrate. With the diversification of mobile phone models and the varying thicknesses of substrates, the demand for multi-station continuous automated processing in production lines is increasing. Most existing plastic hot-melt equipment uses a fixed feeding platform, making it difficult to automatically adjust the distance between the hot-melt pressing module and the platform according to the substrate thickness. This requires manual replacement of pads or manual adjustment of the heating head position, resulting in long changeover times and poor equipment flexibility. Furthermore, traditional equipment is mostly single-station operation, lacking an automatic transfer mechanism between the hot-melt station and the loading / unloading station, making it difficult to form a continuous production line, relying on manual handling, and resulting in low automation. In addition, conventional hot-melt equipment often uses ordinary cylinders to drive the pressing down, which cannot achieve closed-loop precise control of the pressing stroke and output pressure, leading to poor welding quality stability and defects such as overflow or weak welds.

[0003] In summary, in the field of intelligent manufacturing equipment and industrial control software design technology, there is an urgent need for a hot melt equipment that can automatically adapt to substrates of different thicknesses, realize automatic workpiece transfer between multiple workstations, and has closed-loop control of the downward stroke and pressure, so as to improve the flexibility, efficiency and yield of hot melt production of mobile phone case lens decorative parts. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a plastic hot-melt equipment and a hot-melt production method for mobile phone case lens decorative parts. By adjusting the height of the feeding platform through a spacing adjustment mechanism, the servo-driven hot-melt module can automatically adapt to and press down mobile phone case substrates of different thicknesses when performing a fixed pressing stroke, eliminating the need to repeatedly set pressing parameters. At the same time, it realizes automatic workpiece transfer and pressure closed-loop control between multiple workstations, thereby improving the flexibility, efficiency, and yield of hot-melt production of mobile phone case lens decorative parts.

[0005] In a first aspect, the present invention provides a plastic hot-melt equipment for the hot-melt production of lens decorative parts for mobile phone cases, the equipment comprising: The servo-driven pressure-melting module, mounted on the frame, is configured for closed-loop control of the pressure stroke and melting pressure. A movable feeding platform is set on the frame and located below the servo-pressed hot melt module. The movable feeding platform is configured to receive mobile phone case substrates at the feeding station and to limit the placement and move the mobile phone case substrates at multiple stations. A spacing adjustment mechanism is installed on the frame and located at the bottom of the movable feeding platform. It is used to lift and adjust the spacing between the feeding platform and the servo pressing hot melt module so that when the servo pressing hot melt module presses down a preset fixed distance, it can fit and press the mobile phone case substrate of the current thickness. The conveying mechanism is set on the frame and located at the loading station of the movable feeding platform. It is used to automatically load the lens decoration part to the predetermined position of the mobile phone case substrate to wait for the servo pressing hot melt module to press and melt it, and fix it to the mobile phone case substrate. After the lens decoration is fixed to the mobile phone case substrate, the movable feeding platform moves the mobile phone case substrate with the lens decoration fixed to the unloading station.

[0006] Furthermore, the servo-driven hot melt module includes a servo electric cylinder and a hot melt heating head installed at the output end of the servo electric cylinder. The servo electric cylinder is connected to a PLC controller, which is used to collect the pressing displacement and output pressure in real time, and to set the pressing speed, holding time, pressing depth, and hot melt pressure. The servo electric cylinder, in conjunction with the PLC controller, can collect the pressing displacement and output pressure in real time, and accurately set the pressing speed, holding time, pressing depth, and hot melt pressure, thereby achieving precise stroke control and pressure regulation. This effectively avoids excessive pressure leading to overflow or insufficient pressure leading to weak welding, ensuring consistent dimensional consistency and a high yield rate in hot melt processing.

[0007] Furthermore, the plastic hot melt equipment also includes a temperature control system. This system comprises a thermal conductivity sensor installed within the hot melt heating head and a PID temperature control module connected to the thermal conductivity sensor. The PID temperature control module is connected to the PLC controller and is used to adjust the heating power in real time based on the temperature feedback from the thermal conductivity sensor to maintain the hot melt temperature within a set process range. The temperature control system, through real-time temperature feedback from the thermal conductivity sensor within the hot melt heating head and dynamic adjustment of the heating power by the PID temperature control module, can stably maintain the hot melt temperature within the set process range, preventing workpiece burns or insufficient hot melt, and reducing defect rates such as incomplete melting.

[0008] Furthermore, the spacing adjustment mechanism includes a screw lifting mechanism and a linear guide rail. The screw lifting mechanism drives the movable feeding platform to move vertically up and down along the linear guide rail to adjust the spacing. The spacing adjustment mechanism uses a screw lifting mechanism and a linear guide rail to drive the feeding platform to move vertically up and down, resulting in a stable and reliable structure with high transmission accuracy. It can smoothly and accurately adjust the spacing between the feeding platform and the hot melt module, ensuring reliable adaptation to substrates of different thicknesses and enhancing the equipment's versatility and ease of changeover.

[0009] Furthermore, the movable feeding platform includes a platform body and a drive mechanism. The spacing adjustment mechanism supports the platform body and the drive mechanism, causing them to move vertically together. The drive mechanism drives the platform body to move horizontally between the feeding station and the hot-melt station. By using the spacing adjustment mechanism to support the platform body and drive mechanism and move them vertically together, while the drive mechanism independently drives the platform's horizontal movement, the coordination of equipment movements and operational reliability are improved.

[0010] Furthermore, the conveying mechanism includes a linear conveying module and a vacuum adsorption fixture. The vacuum adsorption fixture is used to adsorb the lens decoration and move it along the linear conveying module to the predetermined position. The conveying mechanism uses a linear conveying module in conjunction with a vacuum adsorption fixture to pick up the lens decoration without damage via adsorption and accurately move it to the predetermined position along the linear conveying module. This achieves flexible, precise, and automated feeding of the decoration, reducing manual operation errors and improving feeding cycle time and production efficiency.

[0011] Furthermore, the movable feeding platform is also equipped with a positioning cylinder, which is used to laterally press against the mobile phone case substrate to limit its position. The positioning cylinder on the movable feeding platform can reliably press against the mobile phone case substrate from the side before heat melting, achieving rigid limiting, ensuring accurate heat melting points, and improving assembly precision and product consistency.

[0012] Furthermore, the plastic hot melt equipment also includes an electrical control system, which includes a control panel for inputting and displaying parameters such as hot melt temperature, pressing pressure, pressing stroke, holding time, and station spacing. The electrical control system, equipped with a control panel, centrally inputs and displays parameters such as hot melt temperature, pressing pressure, pressing stroke, holding time, and station spacing, providing an intuitive human-machine interface, simplifying the operation process, reducing reliance on operator skills, and improving the equipment's intelligence and ease of operation.

[0013] Furthermore, the electrical control system includes a PLC controller equipped with a storage module for digitally storing and recalling process parameters for different batches. The PLC controller's storage module enables digital storage and one-click recall of all hot-melt parameters, such as temperature, pressure, stroke, and holding time, achieving standardized management and rapid switching of process parameters for different batches of products, reducing changeover and debugging time, and ensuring consistent quality in mass production.

[0014] Secondly, the present invention provides a hot-melt production method for a mobile phone case lens decorative part, the method employing the aforementioned plastic hot-melt equipment, the method comprising: The movable feeding platform is controlled to receive the mobile phone case substrate from the feeding station and limit its movement so as to transfer it to the hot melt station. After the movable feeding platform receives the mobile phone case substrate from the feeding station, the transport mechanism is controlled to automatically feed the lens decoration part and transfer it to the predetermined position of the mobile phone case substrate at each station on the movable feeding platform. After the mobile phone case substrate and lens decoration parts are transferred to the hot melt station by the movable feeding platform, the spacing adjustment mechanism is controlled to lift and adjust the spacing between the movable feeding platform and the servo pressing hot melt module according to the thickness of the mobile phone case substrate to be processed. The servo-controlled pressing hot melt module presses down at a preset fixed distance to hot melt and fix the lens decoration to the mobile phone case substrate; After the lens decoration is fixed by heat melting, the spacing adjustment mechanism is controlled to descend so that the movable feeding platform is reset. Then, the movable feeding platform is controlled to move to move the mobile phone case substrate with the lens decoration fixed to the unloading station.

[0015] The production method of this invention includes a complete automated process of substrate loading and transfer, decorative part loading, station switching, adaptive spacing adjustment, downward heat fusion, spacing reset, and workpiece transfer to the unloading station. Through the orderly coordination of each step, fully automated continuous production of loading, heat fusion, and unloading is achieved, reducing manual intervention. After heat fusion is completed, the spacing adjustment mechanism is controlled to descend and reset before the platform moves, ensuring safe and interference-free equipment operation. At the same time, the spacing is automatically adjusted according to the substrate thickness, enabling a single set of equipment to flexibly adapt to various product specifications, thereby improving overall production efficiency, operational safety, and product yield.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The plastic hot-melt equipment and hot-melt production method for mobile phone case lens decorative parts provided by this invention achieve closed-loop control of the pressing stroke and hot-melt pressure by integrating a servo-driven hot-melt module, solving the problems of poor accuracy and unstable welding quality of existing cylinder drives; the lifting and feeding platform of the spacing adjustment mechanism automatically adapts to mobile phone case substrates of different thicknesses and sizes, overcoming the defects of long changeover time and poor flexibility of fixed platforms; the automatic transfer of workpieces between the loading station, hot-melt station and unloading station by the movable feeding platform, and the automatic feeding of decorative parts by the handling mechanism, improve the automation level, production flexibility and processing yield of mobile phone case lens decorative parts production. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0018] Figure 1This is a schematic diagram of a structure of the plastic hot melt equipment for removing the casing according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a retaining casing for a plastic hot melt equipment according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a hot-melt production method for a mobile phone case lens decorative part according to an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Servo-driven pressure-down hot melt module; 2. Rack; 3. Movable material feeding platform; 4. Spacing adjustment mechanism; 5. Handling mechanism; 6. Chassis. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] Example 1 See Figure 1 and Figure 2 This embodiment provides a plastic hot-melt equipment for the hot-melt production of lens decorative parts for mobile phone cases. The equipment is assembled on a frame and formed by a cover. The frame serves as the base for the entire machine, and an electrical control cabinet can be installed at its bottom for the integrated installation of various electrical control components. The bottom of the frame can be equipped with casters and adjustable support feet to facilitate equipment relocation and leveling.

[0022] The plastic hot melt equipment in this embodiment mainly includes: a servo-driven pressure hot melt module, a movable feeding platform, a spacing adjustment mechanism, a conveying mechanism, and an electrical control system. Each part will be described in detail below.

[0023] The servo-driven hot-melt module is located on the upper part of the frame, and its core actuator is a servo electric cylinder. The servo electric cylinder is mounted vertically downwards, and a hot-melt heating head is installed at its output end. The servo electric cylinder communicates with the PLC controller, forming a closed-loop control circuit. During the hot-melt operation, the PLC controller can collect real-time data on the downward displacement and output pressure of the servo electric cylinder, and precisely set the downward speed, holding time, downward depth, and hot-melt pressure according to preset parameters. Because the servo electric cylinder itself has displacement and pressure feedback capabilities, the entire downward process can achieve precise stroke control and stepless pressure adjustment. For example, when processing thinner mobile phone case substrates, the PLC can set a smaller downward depth and a lower holding pressure to avoid puncture or overflow; when processing thicker substrates, the parameters are adjusted accordingly to ensure reliable welding of decorative parts.

[0024] The movable feeding platform is mounted on the frame, located below the servo-driven hot melt module. The movable feeding platform includes a platform body and a drive mechanism for moving the platform body horizontally. The platform body is equipped with multiple workstations for positioning and transferring the mobile phone case substrate.

[0025] To address the issue of varying substrate thicknesses for different mobile phone case models, a spacing adjustment mechanism is installed on the frame at the bottom of the movable feeding platform. In this embodiment, the spacing adjustment mechanism employs a combination of a screw-driven lifting mechanism and a linear guide rail. The screw-driven lifting mechanism, controlled by a PLC, drives the entire movable feeding platform vertically up and down along the linear guide rail, thereby precisely adjusting the vertical spacing between the feeding platform and the servo-driven hot-melt module above. The screw drive, combined with the linear guide rail, ensures smoothness, high precision, and good rigidity during the lifting process.

[0026] Specifically, the assembly relationship between the spacing adjustment mechanism and the movable feeding platform is as follows: the upper support platform body and its drive mechanism of the spacing adjustment mechanism move vertically together with the screw lifting mechanism; while the drive mechanism is independently responsible for driving the platform body to move horizontally between the feeding station and the hot-melt station. This hierarchical design ensures that vertical adjustment and horizontal transfer do not interfere with each other, resulting in good coordination and reliable operation.

[0027] The working logic of this spacing adjustment mechanism is as follows: when the pressing stroke of the servo-driven hot melt module is set to a preset fixed distance (this distance is the optimal hot melt compression amount set uniformly according to the process), for mobile phone case substrates of different thicknesses, the equipment does not need to change the pressing stroke parameters of the servo electric cylinder. Instead, it changes the initial relative position between the upper surface of the substrate and the hot melt heating head by raising or lowering the feeding platform through the spacing adjustment mechanism. In this way, the servo electric cylinder only needs to perform the same fixed pressing stroke each time to automatically "adapt" to and press down the substrate of the current thickness, reducing the difficulty of equipment adjustment and the complexity of parameter management.

[0028] The transport mechanism is mounted on the frame, located on one side of the loading station of the movable feeding platform. The transport mechanism includes a linear conveyor module and a vacuum suction fixture mounted on it. The vacuum suction fixture is connected to a negative pressure air source, enabling it to pick up and remove lens decorative parts without damage. The linear conveyor module is controlled by a PLC, driving the vacuum suction fixture to reciprocate between the decorative part feeding position and the predetermined assembly position of the mobile phone case substrate on the feeding platform. When the movable feeding platform arrives at the loading station carrying the substrate, the transport mechanism precisely places the decorative part into the mounting hole or corresponding position of the substrate, awaiting subsequent heat-melting fixation.

[0029] To ensure the accuracy of hot-melt bonding, each station on the movable feeding platform is equipped with positioning cylinders. These cylinders are located on the sides of the stations. When the phone case substrate is placed or transferred to the station, the piston rod of the positioning cylinder extends, rigidly pressing the substrate from the side or bottom to achieve precise positioning. This positioning action is performed throughout the entire process of loading decorative parts and subsequent hot-melt pressing, ensuring that the hot-melt riveting points of each decorative part are precisely consistent.

[0030] The temperature control system is a crucial element in achieving high-quality hot melt welding. Each hot melt heating head has a built-in thermal conductivity temperature sensor, such as a thermocouple or thermistor. This sensor connects to an independent PID temperature control module, which in turn interacts with a PLC controller. During the preheating and processing stages, the thermal conductivity sensor collects the actual temperature of the hot melt heating head in real time and feeds it back to the PID temperature control module. The PID module adjusts the power output to the heating head in real time based on the deviation between the set temperature and the current temperature through proportional, integral, and derivative calculations. This closed-loop temperature control mechanism can keep the temperature fluctuation of the hot melt head within a very small range, stably maintaining it within the set process range. This eliminates the temperature overshoot or undershoot problems caused by traditional on / off temperature control methods, effectively avoiding workpiece burns and incomplete melting defects.

[0031] The electrical control system is integrated into the control cabinet within the rack, primarily comprising a PLC controller, servo drivers, a temperature control module, and a human-machine interface (HMI) control panel. The control panel serves as the operation entry point, allowing operators to centrally input and view in real-time all process parameters, including hot melt temperature, pressing pressure, pressing stroke, holding time, and station spacing. The PLC controller is equipped with a storage module. Once a set of optimal process parameters for a specific product (such as the temperature, pressure, stroke, and time corresponding to model A mobile phone case) is determined, these parameters can be digitally stored as a formula. When switching production batches, simply calling the corresponding formula number on the control panel will automatically configure the parameters, enabling rapid production changeover and standardized process management.

[0032] Example 2 See Figures 1-3 This embodiment provides a hot-melt production method for a mobile phone case lens decorative part, including the following steps: S101. Control the movable feeding platform to receive the mobile phone case substrate from the feeding station and limit it so as to transfer it to the hot melt station. After the movable feeding platform receives the mobile phone case substrate from the feeding station, control the conveying mechanism to automatically feed the lens decoration part and transfer it to the predetermined position of the mobile phone case substrate at each station on the movable feeding platform. S102. After the mobile phone case substrate and lens decoration are transferred to the hot melt station on the movable feeding platform, the spacing adjustment mechanism is controlled to lift and adjust the spacing between the movable feeding platform and the servo pressing hot melt module according to the thickness of the current mobile phone case substrate to be processed. S103. Control the servo-driven pressing hot melt module to press down at a preset fixed distance to hot melt and fix the lens decoration to the mobile phone case substrate. The preset fixed distance corresponds to the standard hot melt compression amount. Since the movable feeding platform has been lifted to the precise position, the pressing action at this fixed distance can be adapted to the thickness of the current mobile phone case substrate to hot melt and fix the lens decoration to the mobile phone case substrate. S104. After the lens decoration is fixed by hot melting, control the spacing adjustment mechanism to lower so that the movable feeding platform is reset. Then control the movable feeding platform to move and move the mobile phone case substrate with the lens decoration fixed to the unloading station.

[0033] The following describes in detail the complete automated process of the hot-melt production method for mobile phone case lens decorative parts provided in this embodiment, based on the above-described equipment structure.

[0034] First, in standby mode, the operator selects or inputs the process parameter formula for the current batch of products through the control panel, and the PLC controller automatically completes the setting of parameters such as hot melt temperature, pressing pressure, pressing stroke, and holding time.

[0035] After the process starts, the drive mechanism of the movable feeding platform first moves the platform body to the feeding station. At this station, the mobile phone case substrate is placed on the platform by the previous process or with manual assistance, and the positioning cylinder then actuates to clamp the substrate, completing the receiving and limiting of the substrate. Immediately afterwards, the vacuum suction fixture of the conveying mechanism suctions the lens decoration part from the feeding point, moves along the linear conveyor module, and accurately places the decoration part into the predetermined position of the already limited mobile phone case substrate.

[0036] After the decorative parts are placed, the drive mechanism moves the platform body horizontally, transferring the fixture carrying the substrate and decorative parts to the hot-melt station, positioning it directly below the servo-pressed hot-melt module. Once in position, the PLC, based on the thickness of the mobile phone case substrate to be processed, controls the screw lifting component of the spacing adjustment mechanism to drive the entire movable feeding platform vertically upward along the linear guide rail, precisely adjusting the spacing between the platform and the hot-melt module to the target value. At this point, the upper surface of the substrate is in the optimal starting position for hot-melt processing.

[0037] Subsequently, the PLC triggers the temperature control system to ensure that the hot melt heating head has reached and stabilized at the set temperature. Once the conditions are met, the servo electric cylinder receives a control signal and drives the hot melt heating head to press down at a predetermined fixed distance at a uniform speed. Throughout the pressing process, the PLC monitors the displacement and pressure signals in real time. After reaching the set stroke, the servo electric cylinder stops feeding and maintains constant pressure for pressure-holding hot melt. Under this constant temperature and pressure condition, the plastic at the contact surface between the decorative part and the substrate melts and bonds together.

[0038] After the preset pressure holding time and initial curing of the plastic weld joint, the servo cylinder rises and resets. Immediately afterwards, the spacing adjustment mechanism descends, resetting the movable unloading platform to a safe horizontal height to prevent the workpiece from scraping and interfering with the upper heat fusion head. After the platform resets, the positioning cylinder releases, and the drive mechanism actuates again, transferring the platform body along with the heat-fused product to the unloading station. At the unloading station, the finished product is removed, and the platform immediately returns unloaded to the loading station to begin the next production cycle.

[0039] Thus, through the automated cycle of material loading and transfer, decorative part loading, workstation switching, spacing adaptive adjustment, pressing and hot melting, spacing reset, and finished product transfer and unloading, this embodiment realizes fully automated continuous production of mobile phone case lens decorative parts, which greatly improves production efficiency, equipment flexibility and product yield.

[0040] It should be noted that the above embodiments are merely preferred embodiments of the present invention, and the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention, and the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A plastic hot melt equipment for the hot melt production of lens decorative parts for mobile phone cases, characterized in that, include: The servo-driven pressure-melting module, mounted on the frame, is configured to control the pressure stroke and melting pressure in a closed loop. A movable feeding platform is set on the frame and located below the servo-pressed hot melt module. The movable feeding platform is configured to receive mobile phone case substrates at the feeding station and to limit the placement and move the mobile phone case substrates at multiple stations. A spacing adjustment mechanism is installed on the frame and located at the bottom of the movable feeding platform. It is used to lift and adjust the spacing between the feeding platform and the servo pressing hot melt module so that when the servo pressing hot melt module presses down a preset fixed distance, it can fit and press the mobile phone case substrate of the current thickness. The conveying mechanism is set on the frame and located at the loading station of the movable feeding platform. It is used to automatically load the lens decoration part to the predetermined position of the mobile phone case substrate to wait for the servo pressing hot melt module to press and melt it, and fix it to the mobile phone case substrate. After the lens decoration is fixed to the mobile phone case substrate, the movable feeding platform moves the mobile phone case substrate with the lens decoration fixed to the unloading station.

2. The plastic hot melt equipment according to claim 1, characterized in that, The servo-driven pressure-melting module includes a servo electric cylinder and a melting heating head installed at the output end of the servo electric cylinder. The servo electric cylinder is connected to a PLC controller, which is used to collect the pressure displacement and output pressure in real time, and to set the pressure speed, holding time, pressure depth and melting pressure.

3. The plastic hot melt equipment according to claim 2, characterized in that, It also includes a temperature control system, which includes a thermal conductivity sensor installed in the hot melt heating head and a PID temperature control module connected to the thermal conductivity sensor. The PID temperature control module is connected to the PLC controller and is used to adjust the heating power in real time according to the temperature feedback from the thermal conductivity sensor in order to maintain the hot melt temperature within the set process range.

4. The plastic hot melt equipment according to claim 1, characterized in that, The spacing adjustment mechanism includes a screw lifting mechanism and a linear guide rail. The screw lifting mechanism is used to drive the movable feeding platform to move vertically up and down along the linear guide rail to adjust the spacing.

5. The plastic hot melt equipment according to claim 1, characterized in that, The movable feeding platform includes a platform body and a drive mechanism. The spacing adjustment mechanism carries the platform body and the drive mechanism, driving the platform body and the drive mechanism to rise and fall vertically together. The drive mechanism is used to drive the platform body to move horizontally between the feeding station and the hot melt station.

6. The plastic hot melt equipment according to claim 1, characterized in that, The transport mechanism includes a linear conveying module and a vacuum adsorption fixture, the vacuum adsorption fixture being used to adsorb the lens decoration and move it along the linear conveying module to the predetermined position.

7. The plastic hot melt equipment according to claim 1, characterized in that, The movable feeding platform is also equipped with a positioning cylinder, which is used to press the mobile phone case substrate from the side to limit its position.

8. The plastic hot melt equipment according to claim 2, characterized in that, It also includes an electrical control system, which includes a control panel for inputting and displaying parameters such as hot melt temperature, pressing pressure, pressing stroke, holding time, and station spacing.

9. The plastic hot melt equipment according to claim 8, characterized in that, The electrical control system includes a PLC controller, which is equipped with a storage module for digitally storing and recalling process parameters for different batches.

10. A hot-melt production method for a mobile phone case lens decorative part, characterized in that, The method, using the plastic hot melt equipment as described in any one of claims 1 to 9, comprises: The movable feeding platform is controlled to receive the mobile phone case substrate from the feeding station and limit its movement so as to transfer it to the hot melt station. After the movable feeding platform receives the mobile phone case substrate from the feeding station, the transport mechanism is controlled to automatically feed the lens decoration part and transfer it to the predetermined position of the mobile phone case substrate at each station on the movable feeding platform. After the mobile phone case substrate and lens decoration parts are transferred to the hot melt station by the movable feeding platform, the spacing adjustment mechanism is controlled to lift and adjust the spacing between the movable feeding platform and the servo pressing hot melt module according to the thickness of the mobile phone case substrate to be processed. The servo-controlled pressing hot melt module presses down at a preset fixed distance to hot melt and fix the lens decoration to the mobile phone case substrate; After the lens decoration is fixed by heat melting, the spacing adjustment mechanism is controlled to descend so that the movable feeding platform is reset. Then, the movable feeding platform is controlled to move to move the mobile phone case substrate with the lens decoration fixed to the unloading station.

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