Integrated injection and suction molding composite forming equipment for plastic shell of medical equipment

Abstract

The medical equipment plastic shell integrated injection molding and plastic absorption composite forming equipment relates to the technical field of plastic forming equipment, and comprises sheet material unwinding, infrared preheating, plastic absorption forming, injection molding and air cooling setting units, each unit being uniformly controlled by a central control console; the equipment realizes automatic winding of raw materials and waste materials through double-roller circulating feeding; the sheet material is uniformly preheated through array infrared heating, the shell base is precisely formed through the negative pressure sealing plastic absorption structure, and finally, the product internal stress is eliminated through air cooling setting after integrated molding of the reinforcing structure through the multi-path synchronous injection molding structure. The whole machine layout is optimized, the plastic absorption and injection molding continuous composite forming is realized, the semi-finished product transfer process is saved, the problems of poor forming precision, complicated process, easy deformation of finished products and insufficient cleanliness of the traditional equipment are solved, the medical shell forming quality and production efficiency are effectively improved, the production cost is reduced, and the batch production demand of high-precision and high-cleanliness of medical equipment shell is met.

Description

Technical Field

[0001] This invention relates to the field of plastic molding and processing equipment technology, specifically to an integrated injection molding and thermoforming composite molding equipment for plastic shells of medical devices. Background Technology

[0002] Plastic housings for medical devices are core components of various medical diagnostic and testing equipment. They have stringent industry standards for molding precision, appearance cleanliness, structural stability, and overall strength, which directly affect the assembly precision, safety, and service life of medical devices.

[0003] Currently, most domestic medical plastic shell production adopts a split processing technology, which separates the processes of sheet preheating, vacuum forming, injection molding reinforcement, and cooling and shaping, and completes the production in stages through multiple independent machines.

[0004] In traditional production models, equipment for each process is placed independently and distributed, which not only occupies a large amount of workshop production space, but also results in scattered equipment wiring and maintenance points, making daily inspection, troubleshooting, and equipment maintenance cumbersome and leading to extremely low utilization of production space. At the same time, split-type production requires manual transfer of thermoformed semi-finished products. Multiple transfers and secondary positioning can easily cause bumps and damage to the medical shell semi-finished products and contaminate their surfaces with dust and impurities, failing to meet the clean production requirements of medical products.

[0005] In the sheet forming process, traditional equipment uses a fixed single-roller feeding and passive material collection structure. The feeding and collection speeds cannot match the processing rhythm of each step, which easily leads to problems such as sheet stretching and deformation, material accumulation and wrinkling, and deviation and sagging, resulting in uneven wall thickness of the formed products. In addition, traditional equipment lacks a systematic waste recycling structure. The scraps generated from cutting are scattered at the production station, which not only requires real-time manual cleaning, increasing labor intensity, but also easily mixes into the mold station, causing mold damage and finished product contamination.

[0006] In the sheet preheating stage, traditional equipment often adopts a single-point heating mode, resulting in uneven heating of the sheet and the presence of local high and low temperature areas. The softening effect is inconsistent, which can easily lead to forming defects such as wrinkles, whitening, cracking, and large wall thickness deviations on the shell surface during the subsequent vacuum forming and stretching process.

[0007] In the thermoforming process, traditional vacuum forming equipment suffers from poor sealing stability, leading to negative pressure leakage at mold joints and uneven vacuum adsorption. This results in defects such as bulging, edge collapse, and missing molds on the medical device's outer shell substrate, making it difficult to meet the high-precision assembly requirements of medical equipment. Furthermore, the separate forming and cutting processes in traditional thermoforming equipment result in cumbersome equipment structures, lengthy processes, and poor dimensional consistency in mass-produced products.

[0008] Currently, most medical plastic shells are manufactured using a single thermoforming process followed by manual bonding for reinforcement. The separate thermoforming and injection molding processes require separate production of semi-finished products and secondary clamping and positioning, resulting in cumbersome procedures, low production efficiency, and low structural strength and dimensional deviations in manually bonded shells, leading to loosening and cracking over time. Furthermore, traditional injection molding equipment is mostly single-mold synchronous injection molding, unable to flexibly switch molding stations according to product specifications. Mold debugging and replacement costs are high, equipment adaptability is limited, and the molten material delivery pipeline is prone to bending and blockage during mold lifting, easily leading to material shortages and breakages.

[0009] The semi-finished products after injection molding lack a dedicated constant-temperature air-cooling and shaping structure. Natural cooling is time-consuming and inefficient, and internal stress is easily generated during the cooling process, leading to warping, deformation, and poor dimensional stability during later storage and use. At the same time, the open cooling environment makes it easy for workshop dust to adhere to the uncured shell surface, causing appearance defects and failing to meet the clean production standards for medical products.

[0010] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0011] To address the shortcomings of existing technologies, this invention provides an integrated injection molding and thermoforming composite molding equipment for medical device plastic shells. This equipment solves problems such as: large footprint and cumbersome maintenance due to separate installations; unstable sheet feeding and inconvenient waste collection; uneven preheating leading to molding defects; poor thermoforming sealing and low molding precision; low efficiency and insufficient shell strength due to separate injection and thermoforming processes; slow cooling of finished products, easy deformation due to residual internal stress, and difficulty in meeting the cleanliness requirements for medical production.

[0012] To achieve the above objectives, the present invention provides the following technical solution:

[0013] The medical device plastic shell integrated injection molding and thermoforming composite molding equipment includes an integrated electrical box, which is a square box with grounding, and four maintenance doors are hinged on the front end face of the integrated electrical box.

[0014] As an optimized solution, a vacuum forming box is fixed in the middle of the upper surface of the integrated electrical box, and a vacuum forming unit is provided inside the vacuum forming box. An infrared preheating box is fixed on one side of the upper surface of the integrated electrical box, and the infrared preheating box is connected to the vacuum forming box. An infrared preheating unit is provided inside the infrared preheating box.

[0015] As an optimized solution, a forming worktable is fixed on the transverse side wall of the integrated electrical box. The forming worktable extends laterally, and a support frame is fixed on the lower surface of the forming worktable. The lower end of the support frame is grounded.

[0016] As an optimized solution, an injection molding box is fixed on the upper surface of the molding worktable. The injection molding box is located near the vacuum forming box. An injection molding unit is provided inside the injection molding box. An air-cooled shaping box is also fixed on the upper surface of the molding worktable. The air-cooled shaping box is connected to the injection molding box. An air-cooled shaping box is provided inside the air-cooled shaping box.

[0017] As an optimized solution, a connecting transfer box is fitted between the vacuum forming box and the injection molding box. The lower end of the connecting transfer box is fixed to the upper surface of the integrated electrical box, and the two lateral end faces of the connecting transfer box are respectively connected to the vacuum forming box and the injection molding box.

[0018] As an optimized solution, a central control console is fixed on the front longitudinal outer wall of the connecting transfer box.

[0019] As an optimized solution, the infrared preheating box has two longitudinally symmetrical unwinding support frames on one side, the lower end of the unwinding support frames is grounded, and a sheet unwinding unit is provided between the two unwinding support frames.

[0020] As an optimized solution, each of the unwinding support frames has two symmetrical mounting slots. A lower winding roller is rotatably mounted between the two lower, longitudinally opposite mounting slots, and an upper unwinding roller is rotatably mounted between the two upper, longitudinally opposite mounting slots.

[0021] As an optimized solution, an unwinding drive motor and a winding drive motor are respectively fixed on the longitudinal outer wall of one of the unwinding support frames.

[0022] As an optimized solution, the output shaft end of the spreading drive motor passes through the mounting straight slot and is fixed to the center of the side end face of the upper spreading roller.

[0023] As an optimized solution, the output shaft end of the winding drive motor passes through the mounting slot and is fixed to the center of the side end face of the lower winding roller.

[0024] As an optimized solution, the connecting transfer box is provided with a longitudinally extending transfer support roller. One end of the transfer support roller is rotatably mounted on the front longitudinal inner wall of the connecting transfer box, and a rotation drive motor is fixed on the rear longitudinal outer wall of the connecting transfer box. The output shaft end of the rotation drive motor passes through the side wall of the connecting transfer box and is fixed to the center of the other end face of the transfer support roller.

[0025] As an optimized solution, the infrared preheating box has a feed inlet on its horizontally closed end face, and the air-cooled shaping box has a discharge outlet on the lower half of its horizontally closed end face.

[0026] As an optimized solution, the medical sheet material is continuously spread out by the upper spreading roller, passes through the feed inlet, goes around the intermediate support roller, folds back and passes out through the feed inlet again, and finally is wound up and mounted on the lower winding roller.

[0027] As an optimized solution, a steering frustum is rotatably provided on the upper surface of the forming worktable near the end, and the steering frustum is used to mount the unloading robotic arm.

[0028] As an optimized solution, a transmission support box is provided below the steering frustum. The transmission support box is a closed square box. The upper end of the transmission support box abuts against the lower surface of the forming worktable. The transmission support box is provided with a mechanical transmission mechanism that drives the steering frustum to rotate around an axis.

[0029] As an optimized solution, a conveying electrical control box is fixed on the upper surface of the forming worktable. The conveying electrical control box is externally connected to two sets of longitudinally symmetrical and laterally extended ball screw guide rails. The ends of the ball screw guide rails pass through the discharge port, the air-cooled shaping box, the injection molding box, the connecting transfer box and the vacuum forming box in sequence and are fixed to the closed end face of the infrared preheating box.

[0030] As an optimized solution, a power supply box is fixed to one side of the lower surface of the forming worktable. The power supply box is located between the support frames, and a portable backup power supply is provided on the lateral side of the power supply box.

[0031] As an optimized solution, the infrared preheating unit includes an infrared radiation power supply, which is fixed on the inner top surface of the infrared preheating box, and several sets of LED infrared heating lamps arranged in an array are fixed on the lower surface of the infrared radiation power supply.

[0032] As an optimized solution, the vacuum forming unit includes a vacuum forming lower mold, which is slidably mounted on two sets of ball screw guides and can slide laterally.

[0033] As an optimized solution, a shaped groove is formed in the middle of the upper surface of the lower mold of the vacuum forming, the interior of the lower mold of the vacuum forming is hollow, and a number of negative pressure adsorption holes are formed on the arc surface of the shaped groove, the negative pressure adsorption holes are connected to the internal cavity of the lower mold of the vacuum forming.

[0034] As an optimized solution, the lower half of both sides of the lower mold is recessed at 45°. Each inclined end face of the lower mold is provided with a docking groove, and each docking groove is provided with a negative pressure air extraction port. The negative pressure air extraction port is connected to the internal cavity of the lower mold.

[0035] As an optimized solution, a gas transfer seat is provided on each of the longitudinal sides of the lower mold of the vacuum forming. The gas transfer seat is hollow inside, and a vacuum pump is fixed on each gas transfer seat. The end of the pipeline of the vacuum pump is connected to the gas transfer seat.

[0036] As an optimized solution, the longitudinal end face of the gas transfer seat near the lower mold of the vacuum forming is set at a 45° angle from bottom to top. The inclined end face of the gas transfer seat is provided with a retractable suction bracket. The suction bracket is hollow inside and matches the docking slot. The suction bracket is fixed with a suction nozzle that matches the negative pressure suction port.

[0037] As an optimized solution, a spring-loaded suction pipe is connected between the gas transfer station and the suction bracket.

[0038] As an optimized solution, the vacuum forming unit further includes a lifting mold base, which is located between the upper and lower parts of the continuously unfolded medical sheet, and the longitudinal width of the lifting mold base is greater than the width of the medical sheet.

[0039] As an optimized solution, four sets of centrally symmetrical lifting and telescopic cylinders are fixed on the inner top surface of the vacuum forming box, and the lower telescopic ends of the lifting and telescopic cylinders are fixed to the four corners of the upper surface of the lifting mold base.

[0040] As an optimized solution, a forming punch is fixed at the center of the lower surface of the lifting mold base, and the forming punch is matched and engaged with the irregular groove in size.

[0041] As an optimized solution, a square-shaped cutter is also fixed on the lower surface of the lifting mold base. The square-shaped cutter is located on the outside of the forming punch, and the size of the square-shaped cutter matches the outer edge of the vacuum forming lower mold.

[0042] As an optimized solution, the injection molding unit includes a raw material melting box, which is fixed to the outer top surface of the injection molding box.

[0043] As an optimized solution, the injection molding box is equipped with a lifting mold base.

[0044] As an optimized solution, four centrally symmetrical lifting telescopic cylinders are fixed on the inner top surface of the injection molding box, and the lower telescopic ends of the lifting telescopic cylinders are fixed at the four corners of the upper surface of the lifting mold base.

[0045] As an optimized solution, four injection punches are installed longitudinally on the lower surface of the lifting mold base. The injection punches are hollow inside and open at the lower end. An injection flow channel communicating with the injection punches is opened in the lifting mold base.

[0046] As an optimized solution, four transfer valves are fixed on the upper surface of the lifting mold base corresponding to the four injection flow channels, and a spring feed pipe is fixed to the upper end of each transfer valve. The upper end of the spring feed pipe is fixedly connected to the raw material melting box.

[0047] As an optimized solution, the air-cooled shaping unit includes a vertically arranged cooling duct, the upper end of which is fixed to the inner top surface of the air-cooled shaping box, and a dustproof net is fixed to the upper opening of the cooling duct.

[0048] As an optimized solution, a rotating fan is fixed inside the cooling duct.

[0049] Compared with the prior art, the beneficial effects of the present invention are:

[0050] I. The overall layout is integrated, the footprint is small, and the operation and maintenance are convenient.

[0051] This equipment uses a grounded square integrated electrical box as the base of the whole machine. The infrared preheating box, vacuum forming box, and transfer box are all integrated on the top surface of the electrical box. The injection molding and air-cooled shaping units are integrated on the forming worktable. The functional boxes are arranged in a straight line along the sheet conveying direction. The overall structure of the equipment is compact, which greatly reduces the space occupied in the workshop and eliminates the need to place the preheating, vacuum forming, and injection molding equipment separately in sections.

[0052] II. The sheet circulation is continuous and stable, and waste materials can be automatically recycled.

[0053] The feeding structure adopts a double roller upper and lower symmetrical unwinding support frame. The upper unwinding roller carries the raw material sheet, and the lower winding roller recovers the edge waste. Two sets of stepper motors independently control the unwinding and winding speeds, which can match the sheet feeding rate of different processes such as preheating, thermoforming, and injection molding. It will not cause the sheet to stretch due to excessive feeding or the sheet to pile up and wrinkle due to excessive winding.

[0054] The sheet adopts a folding and circulating threading path. After the entire process of infrared preheating, vacuum forming, and injection molding, it is automatically rolled back. With the help of the transfer support roller in the transfer box and the positioning pressure roller on the outside of the discharge port, the sheet is kept in a horizontal tension state throughout the process, preventing the sheet from deviating, sagging, or being stretched and deformed in a localized manner, and ensuring that each section of the sheet is heated and formed to a uniform thickness.

[0055] The waste generated during cutting does not need to be collected manually. It is automatically rolled up to the lower winding roller along the sheet circulation path. After the batch production is completed, it is unloaded at one time, saving the process of cleaning up waste in real time, reducing the labor intensity, and preventing scattered waste from mixing into the molding station and damaging the mold or contaminating the finished medical shell.

[0056] The unwinding support frame has adjustable vertical mounting slots, and the upper and lower rollers can be adjusted in height according to different thicknesses and widths of medical plastic sheets, making the equipment adaptable to various specifications of medical shell sheet materials and more versatile.

[0057] 3. Infrared preheating ensures uniform temperature control and eliminates molding defects.

[0058] The infrared preheating box uses an array of LED infrared heating lamps paired with a top infrared radiation power supply. Surface radiation heating replaces traditional single-point heating. The sheet is heated synchronously as it passes through, resulting in uniform heating without local high or low temperature areas. This effectively solves defects such as uneven wall thickness during the stretching of softened sheets, surface wrinkles after forming, and local whitening and cracking.

[0059] The preheating process is set at the front end of the thermoforming process. The sheet material is fully softened in advance before entering the forming station, which reduces the negative pressure required for subsequent thermoforming stretching, reduces the energy consumption of the vacuum pump, and avoids tearing and scrapping of rigid sheet material during stretching, thereby improving the utilization rate of raw materials.

[0060] The preheating chamber is connected to the thermoforming transfer box. After preheating, the softened sheet does not need to be transferred and can directly enter the forming station. This reduces the heat loss and cooling of the sheet in the air, eliminates the need for secondary heating, shortens the interval between forming processes, and improves the overall production cycle.

[0061] IV. The vacuum forming negative pressure structure provides reliable sealing and high precision in substrate molding.

[0062] The 45° angled side of the vacuum forming lower mold is equipped with a docking slot and a retractable air extraction bracket. The angled surface of the air extraction bracket is completely fitted with the angled surface of the vacuum forming lower mold. The air extraction nozzle is precisely aligned with the negative pressure air extraction port. The spring air extraction tube has a reserved extension range. The sealing dock is stable, there is no negative pressure leakage problem, and the negative pressure adsorption force is stable throughout the process.

[0063] The mold has a hollow interior with irregularly shaped grooves and negative pressure adsorption holes distributed throughout. The vacuum suction is applied evenly to the entire softened sheet, and the sheet completely fits the mold cavity contour. The resulting medical shell base has precise dimensions, without bulges, collapsed edges, or local unfitted areas, making it suitable for the high-precision assembly requirements of medical equipment shells.

[0064] The lower surface of the lifting mold base integrates a forming punch and a square-shaped cutting knife. The sheet material is cut simultaneously with the pressing and forming process. The pressing and shaping and the separation of the edges and corners are achieved in one action, eliminating the need for a separate cutting station and simplifying the equipment process. The cutting knife size is larger than the outer ring of the mold, ensuring that the edge of the forming base is intact and without missing material. Cutting waste is uniformly recycled with the winding mechanism.

[0065] The gas transfer unit is equipped with an independent vacuum pump, which can supply gas to both sides separately, ensuring stable vacuum pumping, improving the consistency of the outer shell substrate molding, and minimizing the size difference of mass-produced products.

[0066] V. Integrated vacuum forming and injection molding simplifies processes and enhances the structural strength of the outer shell.

[0067] The equipment integrates both vacuum forming and injection molding units, eliminating the need to produce vacuum-formed semi-finished products separately and then transfer them to the injection molding equipment for secondary processing. After the sheet is vacuum-formed, it is directly transported to the injection molding station by the ball screw guide rail, enabling integrated continuous molding. This eliminates the need for semi-finished product transfer and secondary positioning tooling, significantly shortening the production process and reducing the bumps and contamination problems caused by manual transfer, thus meeting the clean production requirements for medical products.

[0068] The lower surface of the lifting mold base integrates four hollow injection punches. Molten plastic is diverted and transported through independent spring feed pipes and transfer connecting valves. Multiple injections are carried out simultaneously. Reinforcing ribs, assembly bosses, and snap-fit ​​mounting positions can be formed on the surface of the vacuum forming base in one go. The shell is integrally formed without the need for subsequent bonding and assembly. The overall structure has higher strength and uniform assembly and fitting dimensional accuracy.

[0069] Each injection channel is independently equipped with a transfer valve, and a single injection channel can be opened and closed independently. For different specifications of medical shells, the corresponding injection punch can be selectively opened without replacing the entire injection mold base. Mold switching and debugging are simple, and the equipment is compatible with the production of multiple medical shells.

[0070] The raw material melting tank is located on the top of the injection molding tank. The molten raw material is flexibly conveyed by the spring-loaded feeding tube. The pipeline will not bend or get blocked during the mold lifting process, and the molten plastic is conveyed smoothly without material interruption or injection molding material shortage defects.

[0071] VI. Air-cooled shaping structure quickly relieves stress and ensures dimensional stability of finished products.

[0072] The injection-molded composite semi-finished product is directly sent into the air-cooled shaping box for constant temperature air cooling. The cooling air duct is vertically vented, and the airflow evenly covers the entire surface of the shell, quickly removing the injection heat, greatly shortening the cooling waiting time, and improving the overall circulation efficiency of the equipment.

[0073] The air-cooling process can quickly eliminate the internal stress generated by injection molding and prevent warping and deformation of finished products during long-term storage, ensuring the long-term stability of the assembly dimensions of medical shells; the air duct inlet is equipped with a dustproof net to block workshop dust and debris from entering the cooling air duct, preventing dust from adhering to the surface of the uncured shell and causing appearance defects, thus meeting the clean appearance standards of medical products.

[0074] The air-cooled box is directly connected to the injection molding station, and the discharge port is located in the lower half of the box. The semi-finished product is completely cooled and shaped before being moved out of the workbench for transfer and unloading, avoiding deformation caused by direct transfer of high-temperature semi-finished products. The discharge port is equipped with a swingable positioning pressure roller to press the sheet and semi-finished product tightly during the conveying process, preventing the uncooled workpiece from shifting and bumping. Attached Figure Description

[0075] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0076] Figure 1 This is a schematic diagram of the overall external structure of the present invention in the main viewing direction;

[0077] Figure 2 This is a schematic diagram of the overall external structure of the present invention from a top-down perspective;

[0078] Figure 3 This is a schematic diagram of the overall external structure of the present invention from the left-side view direction;

[0079] Figure 4 This is a schematic diagram of the overall external structure of the present invention from the right-side view direction;

[0080] Figure 5 This is an isometric schematic diagram of the three-dimensional structure of the present invention;

[0081] Figure 6 This is a schematic diagram of the upper and lower isometric projections of the present invention;

[0082] Figure 7 For the present invention along Figure 2 A schematic diagram of the internal structure cut along line AA in the middle;

[0083] Figure 8 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the middle BB line;

[0084] Figure 9 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the CC line;

[0085] Figure 10 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the DD line in the middle;

[0086] Figure 11 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the EE line;

[0087] Figure 12 For the present invention along Figure 1 A schematic diagram of the internal structure cut along the FF line.

[0088] In the diagram: 1-Integrated electrical box, 2-Inspection door, 3-Thermal forming box, 4-Infrared preheating box, 5-Forming workbench, 6-Support frame, 7-Injection molding box, 8-Air-cooled shaping box, 9-Connecting transfer box, 10-Central control console, 11-Unwinding support frame, 12-Installation straight groove, 13-Lower winding roller, 14-Upper unwinding roller, 15-Unwinding drive motor, 16-Winding drive motor, 17-Transfer support roller, 18-Rotation drive motor, 19-Feed inlet, 20-Discharge outlet, 21-Hinge seat, 22-Swing side plate, 23-Positioning pressure roller, 24-Steering frustum, 25-Transmission support box, 26-Conveying electrical control box, 27- 28-Ball screw guide rail, 29-Power supply box, 30-Mobile backup power supply, 31-Infrared radiation power supply, 32-LED infrared heating lamp, 33-Suction forming lower mold, 34-Irregular groove, 35-Negative pressure adsorption hole, 36-Docking slot, 37-Gas transfer seat, 38-Vacuum pump, 39-Evacuation seat, 40-Lifting mold base, 41-Lifting telescopic cylinder, 42-Forming punch, 43-Square frame cutter, 44-Raw material melting box, 45-Lifting mold base, 46-Injection punch, 47-Injection runner, 48-Transfer connecting valve, 49-Spring feed pipe, 50-Cooling air duct, 51-Dustproof net, 52-Rotating fan. Detailed Implementation

[0089] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0090] like Figures 1 to 12 As shown, the medical device plastic shell integrated injection molding and thermoforming composite molding equipment includes an integrated electrical box 1, which is a square box with grounding. Four maintenance doors 2 are hinged on the front end face of the integrated electrical box 1.

[0091] A vacuum forming box 3 is fixed in the middle of the upper surface of the integrated electrical box 1. The vacuum forming box 3 is equipped with a vacuum forming unit. An infrared preheating box 4 is fixed on one side of the upper surface of the integrated electrical box 1. The infrared preheating box 4 is connected to the vacuum forming box 3. An infrared preheating unit is equipped in the infrared preheating box 4.

[0092] A forming worktable 5 is fixed on the transverse side wall of the integrated electrical box 1. The forming worktable 5 extends transversely, and a support frame 6 is fixed on the lower surface of the forming worktable 5. The lower end of the support frame 6 is grounded.

[0093] An injection molding box 7 is fixed on the upper surface of the molding worktable 5. The injection molding box 7 is located near the vacuum forming box 3. An injection molding unit is provided inside the injection molding box 7. An air-cooled shaping box 8 is also fixed on the upper surface of the molding worktable 5. The air-cooled shaping box 8 is connected to the injection molding box 7. An air-cooled shaping box 8 is provided inside the air-cooled shaping box 8.

[0094] A connecting transfer box 9 is fitted between the vacuum forming box 3 and the injection molding box 7. The lower end of the connecting transfer box 9 is fixed on the upper surface of the integrated electrical box 1. The two lateral end faces of the connecting transfer box 9 are respectively connected to the vacuum forming box 3 and the injection molding box 7.

[0095] A central control console 10 is fixed on the front longitudinal outer wall of the connecting transfer box 9.

[0096] Two longitudinally symmetrical unwinding support frames 11 are provided on one side of the infrared preheating box 4. The lower end of the unwinding support frame 11 is grounded, and a sheet unwinding unit is provided between the two unwinding support frames 11.

[0097] Each unwinding support frame 11 has two symmetrical mounting slots 12. A lower winding roller 13 is rotatably mounted between the two lower, longitudinally opposite mounting slots 12, and an upper unwinding roller 14 is rotatably mounted between the two upper, longitudinally opposite mounting slots 12.

[0098] One of the unwinding support frames 11 has an unwinding drive motor 15 and a winding drive motor 16 fixed on its longitudinal outer wall. Both the unwinding drive motor 15 and the winding drive motor 16 are stepper motors.

[0099] The output shaft of the spreading drive motor 15 passes through the mounting straight slot 12 and is fixed to the center of the side end face of the upper spreading roller 14.

[0100] The output shaft of the winding drive motor 16 passes through the mounting slot 12 and is fixed to the center of the side end face of the lower winding roller 13.

[0101] The connecting transfer box 9 is provided with a longitudinally extending transfer support roller 17. One end of the transfer support roller 17 is rotatably mounted on the front longitudinal inner wall of the connecting transfer box 9. A rotation drive motor 18 is fixed on the rear longitudinal outer wall of the connecting transfer box 9. The end of the output shaft of the rotation drive motor 18 passes through the side wall of the connecting transfer box 9 and is fixed to the center of the other end face of the transfer support roller 17.

[0102] The infrared preheating box 4 has a feed inlet 19 on its horizontal closed end face, and the air-cooled shaping box 8 has a discharge outlet 20 on the lower half of its horizontal closed end face.

[0103] Two longitudinally symmetrical hinge seats 21 are provided on the upper and lower sides of the discharge port 20. Each hinge seat 21 is rotatably provided with a swing side plate 22, and a positioning pressure roller 23 is rotatably provided between the two longitudinally opposite swing side plates 22.

[0104] The medical sheet material is continuously spread out by the upper spreading roller 14, passes through the feed inlet 19, goes around the intermediate support roller 17, folds back and passes out through the feed inlet 19 again, and finally is wound up and mounted on the lower winding roller 13.

[0105] A steering frustum 24 is rotatably mounted on the upper surface of the forming worktable 5 near its end. The steering frustum 24 is used to mount the unloading robotic arm.

[0106] A transmission support box 25 is provided below the steering frustum 24. The transmission support box 25 is a closed square box. The upper end of the transmission support box 25 abuts against the lower surface of the forming worktable 5. The transmission support box 25 is equipped with a mechanical transmission mechanism that drives the steering frustum 24 to rotate around the axis.

[0107] The upper surface of the forming workbench 5 is fixed with a conveying electrical control box 26. The conveying electrical control box 26 is connected to two sets of longitudinally symmetrical and laterally extended ball screw guide rails 27. The ends of the ball screw guide rails 27 pass through the discharge port 20, the air-cooled shaping box 8, the injection molding box 7, the connecting transfer box 9, and the vacuum forming box 3 in sequence and are fixed to the closed end face of the infrared preheating box 4.

[0108] A power supply box 28 is fixed on one side of the lower surface of the forming worktable 5. The power supply box 28 is located between the support frames 6. A portable backup power supply 29 is provided on the lateral side of the power supply box 28.

[0109] The infrared preheating unit includes an infrared radiation power supply 30, which is fixed on the inner top surface of the infrared preheating box 4. Several sets of LED infrared heating lamps 31 are fixed on the lower surface of the infrared radiation power supply 30.

[0110] The vacuum forming unit includes a vacuum forming lower mold 32, which is slidably mounted on two sets of ball screw guide rails 27 and can slide laterally.

[0111] A shaped groove 33 is provided in the middle of the upper surface of the lower mold 32. The interior of the lower mold 32 is hollow. Several negative pressure adsorption holes 34 are provided on the arc surface of the shaped groove 33. The negative pressure adsorption holes 34 are connected to the internal cavity of the lower mold 32.

[0112] The lower half of both sides of the lower mold 32 is recessed at 45°. Each inclined end face of the lower mold 32 is provided with a docking groove 35. Each docking groove 35 is provided with a negative pressure air extraction port in the middle. The negative pressure air extraction port is connected to the internal cavity of the lower mold 32.

[0113] Each of the longitudinal sides of the vacuum forming lower mold 32 is provided with a gas transfer seat 36. The gas transfer seat 36 is hollow inside. Each gas transfer seat 36 is fixed with a vacuum pump 37. The end of the pipe of the vacuum pump 37 is connected to the gas transfer seat 36.

[0114] The longitudinal end face of the gas transfer seat 36 near the lower mold 32 is set at a 45° angle from bottom to top. The gas transfer seat 36 is provided with a retractable suction seat 38 on the inclined end face. The suction seat 38 is hollow inside and matches the docking slot 35. The suction seat 38 is fixed with a suction nozzle that matches the negative pressure suction port.

[0115] A spring-loaded suction pipe is connected between the gas transfer seat 36 and the suction bracket 38.

[0116] The vacuum forming unit also includes a lifting mold base 39, which is located between the upper and lower parts of the continuously unfolded medical sheet. The longitudinal width of the lifting mold base 39 is greater than the width of the medical sheet.

[0117] Four sets of centrally symmetrical lifting and telescopic cylinders 40 are fixed on the inner top surface of the vacuum forming box 3. The lower telescopic ends of the lifting and telescopic cylinders 40 are fixed to the four corners of the upper surface of the lifting mold base 39.

[0118] A forming punch 41 is fixed at the center of the lower surface of the lifting mold base 39, and the forming punch 41 is matched and engaged with the irregular groove 33.

[0119] A rectangular cutter 42 is also fixed on the lower surface of the lifting mold base 39. The rectangular cutter 42 is located on the outside of the forming punch 41, and the size of the rectangular cutter 42 matches the outer edge of the vacuum forming lower mold 32.

[0120] The injection molding unit includes a raw material melting box 43, which is fixed on the outer top surface of the injection molding box 7.

[0121] The injection molding box 7 is equipped with a hoisting mold base 44.

[0122] Four centrally symmetrical lifting telescopic cylinders 45 are fixed on the inner top surface of the injection molding box 7. The lower telescopic ends of the lifting telescopic cylinders 45 are fixed at the four corners of the upper surface of the lifting mold base 44.

[0123] Four injection punches 46 are installed longitudinally on the lower surface of the lifting mold base 44. The injection punches 46 are hollow inside and open at the lower end. An injection flow channel 47 communicating with the injection punches 46 is opened in the lifting mold base 44.

[0124] The upper surface of the lifting mold base 44 is fixed with four intermediate connecting valves 48 corresponding to the four injection flow channels 47. Each intermediate connecting valve 48 has a spring feed pipe 49 fixed at its upper end, and the upper end of the spring feed pipe 49 is fixedly connected to the raw material melting box 43.

[0125] The air-cooled shaping unit includes a vertically arranged cooling duct 50. The upper end of the cooling duct 50 is fixed to the inner top surface of the air-cooled shaping box 8, and a dustproof net 51 is fixed at the upper opening of the cooling duct 50.

[0126] A rotating fan 52 is fixed inside the cooling duct 50.

[0127] Observation windows are provided on the longitudinal outer walls on both sides of the vacuum forming box 3 and the injection forming box 7.

[0128] When using this invention:

[0129] First, load the entire roll of medical plastic sheet onto the upper unwinding roller 14 between the two unwinding support frames 11, and install the empty roll cylinder on the lower winding roller 13; then start the unwinding drive motor 15 and the winding drive motor 16 respectively to drive the upper unwinding roller 14 to unwind the material and the lower winding roller 13 to wind the material.

[0130] The sheet end is manually pulled and inserted into the infrared preheating box 4 through the side feed port 19. It is then conveyed forward to the connecting transfer box 9, bypasses the transfer support roller 17 driven by the rotation drive motor 18 inside the box, and folds back to exit the infrared preheating box 4 through the feed port 19 again. Finally, the end is fixed on the empty material cylinder of the lower winding roller 13, completing the continuous cyclic feeding of the sheet.

[0131] The integrated electrical box 1 is grounded to complete the basic power supply for the whole machine. The power supply box 28 between the support frame 6 below the forming workbench 5 supplies power to the main equipment. The matching mobile backup power supply 29 is used for emergency power supply in case of power failure. The conveyor control box 26 connects to the control system of two sets of ball screw guide rails 27. The central control console 10 is powered on to complete the preset of parameters of each unit.

[0132] The transmission mechanism is ready inside the transmission support box 25 below the steering platform 24, and the unloading robot arm can be pre-installed on the top of the steering platform 24, waiting to be called by the finished product unloading process.

[0133] First, infrared preheating is performed: the sheet is fed out at a uniform speed by the upper spreading roller 14 and continuously fed into the infrared preheating box 4; the infrared radiation power supply 30 at the top of the infrared preheating box 4 supplies power, and the array of LED infrared heating lamps 31 continuously radiate downwards to raise the temperature, uniformly heating the medical plastic sheet as it passes through, so that the sheet reaches the softening temperature suitable for thermoforming stretching and composite injection molding, avoiding uneven heating in certain areas that may cause molding wrinkles and wall thickness deviations. The softened sheet after preheating continues to be conveyed forward and enters the area of ​​the connecting transfer box 9 through the feed port 19. The transfer support roller 17 uniformly supports the sheet, and with the help of the upper and lower positioning pressure rollers 23, it ensures that the sheet is conveyed horizontally without pulling.

[0134] Next, vacuum forming is performed: the ball screw guide rail 27 drives the lower vacuum forming mold 32 to feed laterally from the vacuum forming box 3 to the connecting transfer box 9, and moves it to the designated station below the softened sheet.

[0135] Four sets of lifting and telescopic cylinders 40 at the top of the vacuum forming box 3 extend downwards simultaneously, driving the lifting mold base 39 to press down, so that the forming punch 41 fits against the upper surface of the sheet material, pressing the softened sheet material tightly into the irregular groove 33 at the top of the vacuum forming lower mold 32; the square frame-shaped cutter 42 matching the outer ring of the forming punch 41 presses down simultaneously, cutting out the outline of the sheet material required for the outer shell forming, and the excess scraps are circulated and transported with the sheet material to the lower winding roller 13 for unified recycling.

[0136] Vacuum pumps 37 on the gas transfer seats 36 on both sides are started in advance. The suction brackets 38 on the inclined end face of the gas transfer seats 36 extend forward and are engaged in the docking slots 35 on the 45° inclined surfaces on both sides of the lower mold 32. The suction nozzles on the suction brackets 38 are aligned with the negative pressure suction ports to complete the sealing docking. The vacuum pumps 37 form a negative pressure passage through the gas transfer seats 36, the spring suction pipe, and the suction brackets 38. The negative pressure adsorption holes 34 densely distributed on the inner wall of the irregular groove 33 are simultaneously vacuumed. The softened sheet completely adheres to the inner wall of the irregular groove 33 under the action of negative pressure, completing the vacuum forming and shaping of the medical shell base.

[0137] After the negative pressure holding is completed, the vacuum pump 37 releases pressure, and the air extraction bracket 38 retracts and disengages from the docking slot 35; the lifting telescopic cylinder 40 raises the lifting mold base 39, the forming punch 41 and the square cutter 42 reset; the ball screw guide rail 27 drives the lower mold 32 with the blister base adsorbed to move laterally, and sends it through the connecting transfer box 9 into the injection molding box 7.

[0138] Then, injection molding is performed: the raw material melting box 43 pre-melts the medical-grade plastic particles at high temperature, and the molten plastic is sent into the internal injection channel 47 of the hoisting mold base 44 through four spring feeding pipes 49 and the transfer connecting valve 48.

[0139] The four sets of lifting telescopic cylinders 45 at the top of the injection molding box 7 push the lifting mold base 44 downwards. The four hollow injection punches 46 arranged at equal intervals at the bottom of the lifting mold base 44 press down to precisely fit the vacuum-formed outer shell base below. Molten plastic is introduced into the injection punch 46 through the injection channel 47, and composite reinforcing structures, assembly bosses, and snap-fit ​​installation positions are injected into the surface of the vacuum-formed base to achieve integrated composite molding of the vacuum-formed base and the injection-formed structure.

[0140] After the injection molding process has been under pressure and cooled for a period of time, the lifting telescopic cylinder 45 drives the lifting mold base 44 and the injection punch 46 to be lifted and reset as a whole, leaving the integrated composite semi-finished product on the vacuum forming lower mold 32.

[0141] Next, air cooling and shaping and unloading are carried out: the ball screw guide rail 27 carries the vacuum forming lower mold 32 and the composite semi-finished product, and pushes it horizontally into the air cooling and shaping box 8; the top of the vertically extending cooling air duct 50 in the air cooling and shaping box 8 is equipped with a dustproof net 51 to block dust, and the rotating fan 52 inside the cooling air duct 50 outputs constant temperature cooling airflow downwards to continuously and quickly air cool and shape the semi-finished product after injection molding, eliminate the internal stress of injection molding, and stabilize the shell size and surface flatness.

[0142] After the air-cooling and shaping are completed, the ball screw guide rail 27 drives the vacuum forming lower mold 32 to move from the lower part of the air-cooling and shaping box 8 to the end position of the forming worktable 5.

[0143] Next, finished product unloading and waste recycling are carried out: the internal mechanical mechanism of the transmission support box 25 drives the steering table 24 to rotate, adjusts the gripping angle of the unloading robot arm, and the robot arm grabs the air-cooled and shaped integrated medical plastic shell finished product and transfers it to the finished product stacking area.

[0144] The lower mold 32 of the vacuum forming box 3 returns to the initial position of the vacuum forming box 3 along the original path of the ball screw guide rail 27, and enters the next forming cycle;

[0145] The waste material generated during forming and cutting is continuously transported along the sheet circulation path and is eventually wound and collected on the lower winding roller 13. After the mass production is completed, it is unloaded and recycled in a centralized manner.

[0146] After the entire batch of production is completed, the infrared preheating, vacuum forming negative pressure, injection molding, air cooling, each roller drive, and guide rail feeding units are shut down through the central control console 10. The main power supply box 28 is cut off, the backup power supply 29 is disconnected, and the four maintenance doors 2 of the integrated electrical box 1 are opened to carry out equipment cleaning, mold maintenance, pipeline and vacuum pump 37 maintenance operations.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. An integrated injection molding and thermoforming composite molding equipment for plastic shells of medical devices, characterized in that: The device includes an integrated electrical box, a vacuum forming box fixed to the middle of the upper surface of the integrated electrical box, a vacuum forming unit provided inside the vacuum forming box, and an infrared preheating box fixed to one side of the upper surface of the integrated electrical box. The infrared preheating box is connected to the vacuum forming box and an infrared preheating unit is provided inside the infrared preheating box. A laterally extending molding worktable is fixed on the transverse side wall of the integrated electrical box. An injection molding box is fixed on the upper surface of the molding worktable. The injection molding box is located near the vacuum forming box. An injection molding unit is provided inside the injection molding box. An air-cooled shaping box is also fixed on the upper surface of the molding worktable. The air-cooled shaping box is connected to the injection molding box. An air-cooled shaping unit is provided inside the air-cooled shaping box. A connecting transfer box is fitted between the vacuum forming box and the injection molding box. The lower end of the connecting transfer box is fixed to the upper surface of the integrated electrical box. The two lateral end faces of the connecting transfer box are respectively connected to the vacuum forming box and the injection molding box. The vacuum forming unit includes a lower vacuum mold that is slidably arranged laterally. A shaped groove is formed in the middle of the upper surface of the lower vacuum mold. The interior of the lower vacuum mold is hollow. A plurality of negative pressure adsorption holes are formed on the arc surface of the shaped groove. The vacuum forming unit also includes a lifting mold base, and a forming punch is fixed at the center of the lower surface of the lifting mold base. The forming punch is matched and engaged with the irregular groove in size. A square-shaped cutter is also fixed on the lower surface of the lifting mold base. The square-shaped cutter is located on the outside of the forming punch, and the size of the square-shaped cutter matches the outer edge of the vacuum forming lower mold. The infrared preheating box has a feed inlet on its horizontally closed end face, and the air-cooled shaping box has a discharge outlet on the lower half of its horizontally closed end face. A steering frustum is rotatably provided on the upper surface near the end of the forming worktable. A transmission support box is provided below the steering frustum. The transmission support box is a closed square box. The upper end of the transmission support box abuts against the lower surface of the forming worktable. A mechanical transmission mechanism for driving the steering frustum to rotate around an axis is provided inside the transmission support box. The upper surface of the forming worktable is fixed with a conveying electrical control box. The conveying electrical control box is externally connected to two sets of longitudinally symmetrical and laterally extended ball screw guide rails. The ends of the ball screw guide rails pass through the discharge port, the air-cooled shaping box, the injection molding box, the connecting transfer box and the vacuum forming box in sequence and are fixed to the closed end face of the infrared preheating box. The vacuum forming lower mold is slidably installed on the two sets of ball screw guide rails. A support frame is fixed to the lower surface of the forming worktable, and the lower end of the support frame is grounded. A power supply box is fixed to one side of the lower surface of the forming worktable, and the power supply box is located between the support frames. A portable backup power supply is provided on the lateral side of the power supply box.

2. The integrated injection molding and thermoforming composite molding equipment for medical device plastic shells according to claim 1, characterized in that: The integrated electrical box is a square box with grounding, and four maintenance doors are hinged to the front end face of the integrated electrical box. A central control console is fixed on the front longitudinal outer wall of the connecting transfer box.

3. The integrated injection molding and thermoforming composite molding equipment for medical device plastic shells according to claim 1, characterized in that: The infrared preheating box has two longitudinally symmetrical unwinding support frames on one side. The lower end of the unwinding support frame is grounded, and a sheet unwinding unit is provided between the two unwinding support frames. Each of the unwinding support frames has two symmetrical mounting slots. A lower winding roller is rotatably mounted between the two lower, longitudinally opposite mounting slots, and an upper unwinding roller is rotatably mounted between the two upper, longitudinally opposite mounting slots. One of the unwinding support frames has an unwinding drive motor and a winding drive motor fixed on its longitudinal outer wall. The output shaft of the spreading drive motor passes through the mounting slot and is fixed to the center of the side end face of the upper spreading roller; The output shaft of the winding drive motor passes through the mounting slot and is fixed to the center of the side end face of the lower winding roller.

4. The integrated injection molding and thermoforming composite molding equipment for medical device plastic shells according to claim 3, characterized in that: The connecting transfer box is equipped with a longitudinally extending transfer support roller. One end of the transfer support roller is rotatably mounted on the front longitudinal inner wall of the connecting transfer box. A rotation drive motor is fixed on the rear longitudinal outer wall of the connecting transfer box. The output shaft end of the rotation drive motor passes through the side wall of the connecting transfer box and is fixed to the center of the other end face of the transfer support roller.

5. The integrated injection molding and thermoforming composite molding equipment for medical device plastic shells according to claim 1, characterized in that: The infrared preheating unit includes an infrared radiation power supply, which is fixed on the inner top surface of the infrared preheating box. Several sets of LED infrared heating lamps are fixed on the lower surface of the infrared radiation power supply.

6. The integrated injection molding and thermoforming composite molding equipment for medical device plastic shells according to claim 1, characterized in that: The lower half of both sides of the lower mold of the vacuum forming is recessed at 45°. Each inclined end face of the lower mold of the vacuum forming is provided with a docking groove. Each docking groove is provided with a negative pressure air extraction port. The negative pressure air extraction port is connected to the internal cavity of the lower mold of the vacuum forming. Each of the two longitudinal sides of the vacuum forming lower mold is provided with a gas transfer seat. The gas transfer seat is hollow inside. Each gas transfer seat is fixed with a vacuum pump. The end of the pipeline of the vacuum pump is connected to the gas transfer seat. The longitudinal end face of the gas transfer seat near the lower mold of the vacuum forming is set at 45° from bottom to top. The inclined end face of the gas transfer seat is provided with a retractable suction bracket. The suction bracket is hollow inside. The suction bracket matches the docking slot. The suction bracket is fixed with a suction nozzle that matches the negative pressure suction port. A spring-loaded suction pipe is connected between the gas transfer station and the suction bracket.

7. The integrated injection molding and thermoforming composite molding equipment for medical device plastic shells according to claim 4, characterized in that: The lifting mold base is located between the upper and lower parts of the continuously unfolded medical sheet, and the longitudinal width of the lifting mold base is greater than the width of the medical sheet. Four sets of centrally symmetrical lifting and telescopic cylinders are fixed on the inner top surface of the vacuum forming box, and the lower telescopic ends of the lifting and telescopic cylinders are fixed to the four corners of the upper surface of the lifting mold base.

8. The integrated injection molding and thermoforming composite molding equipment for medical device plastic shells according to claim 7, characterized in that: The injection molding unit includes a raw material melting box, which is fixed to the outer top surface of the injection molding box; The injection molding box is equipped with a hoisting mold base; Four centrally symmetrical lifting telescopic cylinders are fixed on the inner top surface of the injection molding box, and the lower telescopic ends of the lifting telescopic cylinders are fixed at the four corners of the upper surface of the lifting mold base. The lower surface of the lifting mold base is equipped with four injection punches arranged at equal intervals along the longitudinal direction. The injection punches are hollow inside and open at the lower end. An injection flow channel communicating with the injection punches is opened in the lifting mold base. The upper surface of the hoisting mold base is fixed with four transfer valves corresponding to the four injection flow channels. Each transfer valve has a spring feed tube fixed to its upper end, and the upper end of the spring feed tube is fixedly connected to the raw material melting box.

9. The integrated injection molding and thermoforming composite molding equipment for medical device plastic shells according to claim 1, characterized in that: The air-cooled shaping unit includes a vertically arranged cooling duct. The upper end of the cooling duct is fixed to the inner top surface of the air-cooled shaping box, and a dustproof net is fixed at the upper opening of the cooling duct. A rotating fan is fixed inside the cooling duct.

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