An injection molding apparatus for producing a plastic product

Abstract

The application relates to the technical field of injection molding, and discloses an injection molding equipment for plastic product production, which comprises a machine body provided with an injection device and a mold closing device and a plastic recycling system, the mold closing device is provided with an ejection device, the ejection device is connected with the plastic recycling system; the plastic recycling system comprises a conveying pipeline, an identification module arranged in the conveying pipeline, a recycling pipe, a pushing module for pushing defective products and a heating module, the identification module is connected with a control center, the control center is used for controlling the pushing module, the heating module is connected with the injection device of the machine body, and the identification module, the recycling pipe, the pushing module and the heating module are sequentially connected along a processing path of the defective products to form a full-automatic closed loop recycling circuit. The injection molding equipment has the beneficial effects that the visual identification, pushing, melting and re-injection are integrated in the same equipment to form a full-automatic closed loop recycling circuit from defective product generation to direct re-injection and utilization of the regenerated melt, the recycling period is significantly shortened, and the recycling cost is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of injection molding, and more specifically, to an injection molding equipment for producing plastic products. Background Technology

[0002] Injection molding is one of the core production methods in the plastics processing industry. Its products are widely used in various sectors, including automotive parts, household appliance housings, medical device housings, electronic device structural components, daily consumer goods, and food packaging. With the continuous growth in demand for plastic products from downstream industries and the increasing complexity of product shapes, injection molding production is developing towards higher efficiency, higher quality, and higher automation. During injection molding, a certain percentage of defective products are inevitably generated due to multiple factors such as fluctuations in process parameters, poor mold venting, unbalanced filling, insufficient holding pressure, and uneven barrel temperature distribution. Common defects include insufficient material, shrinkage marks, flash, warpage, and surface flow marks. How to efficiently handle these defective products, reduce material waste, and lower production costs is a real problem that every plastics manufacturing company must face. With increasing global emphasis on resource conservation and environmental protection, the recycling and reuse of plastic waste has become an inevitable trend in the industry. As a source of directly recyclable plastic materials generated during the production process, the online recycling and reuse of defective products will have significant economic and environmental benefits.

[0003] Currently, the main method for handling defective products in injection molding production lines is to collect them offline and then process them centrally. The production site is usually equipped with manual visual inspection to judge the quality of the molded and cooled products. The defective products are manually separated from the good product conveyor line and stored in the waste collection bin next to the production line. When the waste collection bin accumulates to a certain number, the operators regularly transfer the defective products to a special waste treatment workshop. After multiple processes such as manual sorting, mechanical crushing into irregular fragments by a crusher, and melting and re-granulation by an extrusion granulator, the products are stored in the form of recycled granules. They are then mixed with new materials in a certain proportion and reused in injection molding production.

[0004] This offline collection and centralized processing technology has been used in the industry for a long time. Its main drawback is that the processing chain is long and there are many links. From the generation of defective products to their reuse, they need to go through multiple intermediate links such as collection, transfer, sorting, crushing, granulation, storage and re-mixing. The links rely on manual or special logistics equipment for connection, which not only occupies a lot of production space and human resources, but also results in a long plastic recycling cycle and high cost. Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0005] This application proposes an injection molding equipment for the production of plastic products. By integrating visual recognition, automatic pushing, heating and melting, and melt reinjection into the same equipment, it forms a fully automatic closed-loop circuit from the generation of defective products to the direct reinjection of recycled melt into the injection device. The entire process eliminates all intermediate links such as manual collection and transportation, crushing, granulation, storage, and remixing, which significantly shortens the recycling cycle and reduces labor and material transportation costs.

[0006] Therefore, this application provides an injection molding equipment for producing plastic products, including a body having an injection device and a mold clamping device, and a plastic recycling system. The mold clamping device has an ejection device for ejecting the finished product, and the ejection device is connected to the plastic recycling system. The plastic recycling system includes a conveying pipe installed on the material feeding side of the mold clamping device, an identification module installed inside the conveying pipe for identifying defective products, a recycling pipe installed downstream of the identification module, a pushing module corresponding to the recycling pipe for pushing defective products from the conveying pipe into the recycling pipe, and a heating module for melting defective products. The identification module is connected to a control center, which controls the pushing module. The heating module is connected to the injection device of the machine body for conveying the heated and molten plastic into the injection device of the machine body. The identification module, recycling pipe, pushing module, and heating module are connected sequentially along the processing path of defective products, forming a fully automatic closed-loop circuit for defective product recycling.

[0007] By adopting the above technical solution, the visual recognition, automatic pushing, heating and melting of defective products and melt reinjection are integrated into the same equipment, forming a fully automatic closed-loop circuit from the generation of defective products to the direct reinjection of recycled melt into the injection unit. After being ejected from the ejection device of the mold closing device, the defective products enter the conveying pipeline. During the conveying process, the recognition module completes online quality judgment. Once judged as defective products, the pushing module immediately pushes them to the recycling pipe and enters the heating module for melting. The melted recycled melt is directly conveyed to the injection unit to participate in the next molding. In the entire process, defective products do not require manual collection and transportation, do not need to be cooled to room temperature and then centrally stacked offline, and do not need to undergo crushing and granulation processes. All intermediate links such as collection, transportation, sorting, crushing, granulation, storage, and remixing are eliminated, which achieves the purpose of shortening the recycling cycle and reducing labor costs and material transportation costs.

[0008] In addition, this technical solution has outstanding advantages in the thermal history of defective products. During the injection molding process, the plastic raw material is heated and melted in the barrel of the injection device and then injected into the mold. This is the first melting of the plastic. After molding, the product cools and solidifies in the mold to become a solid product. In the traditional offline recycling method, defective products need to be collected, reheated and melted, and extruded and granulated. This is the second melting, granulation and cooling of the defective products to form solid recycled granules. When the recycled granules are mixed with new materials and put into injection molding production, they are heated and melted again. This is the third melting. That is, the defective products have undergone repeated thermal cycles of melting, cooling, secondary melting, recooling and tertiary melting. Every time the plastic undergoes a complete thermal cycle, the plastic molecular chain undergoes thermal oxidation degradation and molecular chain breakage under the action of high temperature and shear force, resulting in a gradual decrease in the molecular weight of the material, an increase in the melt index and a decrease in mechanical properties. In this technical solution, defective products are sent to the heating module immediately after ejection without cooling to room temperature. They only need to undergo a single melting process, directly melting from a solid state into recycled melt. This recycled melt is then directly injected back into the injection molding machine's barrel in a molten state to participate in molding, without the need for cooling, granulation, or reheating. In other words, the defective product undergoes only one thermal transformation from solid to molten from its generation to its re-participation in molding. Compared to traditional methods, this method avoids one melting heating and two complete coolings to room temperature, significantly reducing the thermal oxidative degradation of plastic molecular chains and molecular weight loss. This results in the mechanical properties of the recycled melt after re-injection molding being closer to those of virgin raw materials. The defective product is sent to the heating module with a residual temperature of 60-100°C upon ejection. Compared to the traditional method where the defective product needs to be completely cooled to room temperature and then reheated, this application fully utilizes the residual heat after ejection, saving all the heat input from room temperature to the residual temperature stage, further reducing melting energy consumption and better aligning with the resource conservation goals of the plastic recycling field.

[0009] Preferably, the heating module includes a sealed, heat-insulating, melting shell. The top of the shell is provided with an inlet connected to a recovery pipe. The heating module is provided with a hot air circulation system for heating defective products. The hot air circulation system includes an inlet pipe, a gas heating and circulation device, and an outlet pipe. The gas heating and circulation device is used to heat the airflow and drive the airflow to circulate. The inlet pipe and the outlet pipe are both fixedly connected to and communicate with the shell. A main air source pipe is provided on the inlet pipe to provide kinetic energy to the pushing module. An inlet valve is provided on the inlet pipe downstream of the main air source pipe to control the opening and closing of the inlet pipe.

[0010] By adopting the above technical solution: the main air supply pipe of the driving push module is connected to the air inlet pipe of the hot air circulation system. Under normal circumstances, the airflow in the hot air circulation system, as a heating medium, flows through the air inlet pipe into the heat-insulating melting shell to heat and melt the defective products. When the air inlet valve is closed, the main air supply pipe can also be used as the power source for the push module, realizing the multi-purpose utilization of the kinetic energy of a single air source, without the need to configure a separate power source for the push module. The air inlet valve set on the air inlet pipe is located downstream of the main air supply pipe. Under normal circumstances, the air inlet valve is open and the airflow enters the heat-insulating melting shell through the air inlet pipe to maintain hot air circulation. When it is necessary to push defective products, the air inlet valve is closed to cut off the air supply from the air inlet pipe to the heat-insulating melting shell, so that all the airflow enters the push module through the main air supply pipe, ensuring that the push module obtains sufficient air pressure and flow to complete the push action. At the same time, it avoids the risk of heat loss and personnel burns caused by hot air leakage from the recovery pipe and the conveying pipe during the push process, and ensures the stability of the temperature field in the melting chamber.

[0011] Preferably, the pushing module includes a fixed pipe connected to the main air supply pipe, a piston plate slidably connected to the fixed pipe, a piston rod fixedly connected to the piston plate, and a pusher plate for pushing defective products. The fixed pipe is fixedly connected to the side wall of the conveying pipe, the piston plate is located inside the fixed pipe and is sealed to the inner wall of the fixed pipe, the end of the piston rod away from the piston plate is located inside the conveying pipe and passes through the side wall of the conveying pipe, the piston rod is slidably connected to the side wall of the conveying pipe, and the end of the piston rod located in the conveying pipe is fixedly connected to the pusher plate. A pushing air pipe is provided between the fixed pipe and the main air supply pipe, and the interface between the pushing air pipe and the fixed pipe is located between the piston plate and the bottom wall of the fixed pipe.

[0012] By adopting the above technical solution: the pushing module adopts a pneumatically driven syringe structure. The airflow output from the main air supply pipe enters the chamber between the piston plate and the bottom wall of the fixed tube through the pushing air pipe. As the gas continues to enter the chamber, the air pressure increases, pushing the piston plate to slide away from the bottom wall of the fixed tube. The piston plate drives the piston rod to move synchronously, causing the piston rod to push the pusher plate. The pusher plate smoothly pushes the defective products located in the conveying pipe into the recovery pipe. During the pushing process, the piston plate and the inner wall of the fixed tube remain sealed to prevent gas leakage and a decrease in pushing force. After the pushing action is completed, the gas is discharged from the fixed tube, causing the piston plate to slide back and reset under negative pressure, driving the pusher plate back to the outside of the side wall of the conveying pipe, restoring the smooth flow of the conveying pipe and not affecting the normal passage of subsequent products. The entire pushing action is responsive, precise in stroke, and has sufficient pushing force, which can adapt to the pushing needs of defective products of different sizes and weights.

[0013] Preferably, the end of the recovery pipe near the feed inlet of the insulating molten shell is provided with an opening and closing plate for controlling the connection between the recovery pipe and the insulating molten shell. The opening and closing plate is provided with a lifting device for driving the opening and closing plate to rise and fall. The lifting device is connected to the main air source pipe.

[0014] Preferably, the lifting device includes a lifting airbag connected to the air source main pipe, a lifting plate fixedly connected to the opening and closing plate, a fixing ring sleeved on the outside of the lifting airbag, and a sliding ring slidably connected to the fixing ring. The top of the fixing ring is provided with a lifting groove. The sliding ring is fixedly connected to the lifting plate. The end of the sliding ring away from the lifting plate is located in the lifting groove. The lifting airbag is set in the lifting groove to push the sliding ring up and down. A lifting air pipe is provided between the lifting airbag and the air source main pipe.

[0015] By adopting the above technical solution: the lifting airbag is connected to the main air supply pipe through a lifting air pipe. When the main air supply pipe supplies air, the airflow enters the lifting airbag through the lifting air pipe, causing the lifting airbag to inflate within the lifting groove of the fixed ring. Since the fixed ring is fixedly set on the outer wall of the recovery pipe, the inflated lifting airbag pushes the sliding ring upward, causing the sliding ring to slide upward along the lifting groove, thereby driving the lifting plate and the opening and closing plate to rise synchronously, opening the channel between the recovery pipe and the inlet of the insulation and melting shell. Defective products fall down along the recovery pipe under the action of gravity, pass through the inlet, and enter the inlet of the insulation and melting shell. When the lifting airbag deflates, the sliding ring slides down along the lifting groove and resets under its own weight and the combined weight of the lifting plate and the opening and closing plate, causing the opening and closing plate to descend, closing the recovery pipe channel and re-sealing the inlet, so that the opening and closing plate remains closed under normal conditions. In the closed state, the high-temperature gas inside the molten shell is effectively blocked from entering the conveying pipeline along the recovery pipe. This prevents heat loss from the inlet and avoids the high-temperature gas from affecting the identification module and subsequent products to be inspected in the conveying pipeline. The lifting groove of the fixed ring guides and limits the lifting movement of the sliding ring, ensuring that the opening and closing plate moves in a straight vertical direction. This avoids skewness that could cause the opening and closing plate to jam or fail to seal properly against the wall of the recovery pipe. The entire lifting device is compact and reliable. It eliminates the need for additional guide rods and return springs, reducing the number of parts and the failure rate. At the same time, the flexible drive characteristics of the lifting airbag provide a certain buffer when the opening and closing plate closes, preventing damage to the wall of the recovery pipe and the sealing surface of the opening and closing plate from rigid impacts, thus extending the service life and sealing reliability of the seals.

[0016] Preferably, the feed inlet is provided with a guide cone for diverting the recycled defective products, and the guide cone is fixedly connected to the heat-insulating melting shell.

[0017] Preferably, a sealing groove is provided at one end of the guide cone near the feed inlet. A sealing airbag is embedded in the sealing groove to block the feed channel between the feed inlet and the guide cone. A sealing air pipe is provided between the sealing airbag and the air source main pipe. The sealing airbag is used to inflate and expand using the sealing air pipe before the opening and closing plate opens the recovery pipe to block the feed inlet. After the opening and closing plate seals the recovery pipe again, the sealing airbag vents and retracts into the sealing groove.

[0018] By adopting the above technical solution: the guide cone is set directly below the feed inlet with its cone surface facing the feed inlet's drop direction. The sealing airbag is embedded in the sealing groove at the end of the guide cone near the feed inlet. Under normal conditions, the sealing airbag is in a contracted state, and its outer surface is not higher than the outer surface of the guide cone. The feed channel between the feed inlet and the guide cone remains unobstructed. When the defective product is pushed into the recovery pipe by the push module and before the opening and closing plate opens, the control center first controls the main air supply pipe to inflate and expand the sealing airbag through the sealing air pipe, causing it to bulge out of the sealing groove. This completely blocks the annular feed channel between the feed inlet and the guide cone from the inside. Then, the opening and closing plate opens, and the defective product enters the feed inlet and falls onto the guide cone. Even if the opening and closing plate is in the open state during the period when the sealing airbag blocks the feed channel, the high-temperature gas in the molten shell is still effectively blocked by the sealing airbag and cannot escape upwards to the recovery pipe. After the defective product has completely passed through the feed inlet, the opening and closing plate closes first, and then the sealing airbag vents and contracts back to the sealed position. The feed channel is restored within the groove, and defective products are evenly dispersed along the conical surface to the surrounding area of ​​the insulated melting shell under the action of gravity. This avoids the vertical accumulation of defective products directly below the feed inlet, which would form local stacking. The dispersed defective products are evenly spread within the insulated melting shell and fully contact the high-temperature airflow provided by the hot air circulation system. All parts are heated evenly and melt at a consistent speed. This avoids the problem of the inner layer material not melting in time or the outer layer material overburning and degrading due to stacking, thus improving melting efficiency and the uniformity of melt quality. The sealing airbag and the opening and closing plate constitute a double sealing structure for the feed inlet of the melting chamber. The opening and closing plate acts as the first seal, closing the feed inlet under normal conditions and after the material is dropped. The sealing airbag acts as the second seal, blocking the feed channel during the material dropping process. This achieves a complete seal of the melting chamber from the opening to the closing of the opening and closing plate throughout the entire material dropping process, completely eliminating the window period for hot air leakage and significantly improving the thermal efficiency and energy utilization rate of the insulated melting shell.

[0019] Preferably, a monitoring sensor for monitoring the passage of defective products is installed downstream of the opening and closing plate in the conveying pipeline. The monitoring sensor is connected to the control center. After the monitoring sensor detects that a defective product has passed through, the control center controls the push module to retract, the lifting device to drive the opening and closing plate to descend, and the sealing airbag to vent and retract.

[0020] By adopting the above technical solution: the monitoring sensor is set downstream of the opening and closing plate in the conveying pipeline, that is, in the pipe section between the opening and closing plate and the feed inlet. When the defective product is pushed into the recovery pipe by the pushing module and passes through the position of the opening and closing plate, the defective product continues to fall through the detection area of ​​the monitoring sensor. The monitoring sensor detects the signal of the defective product passing through and transmits it to the control center in real time. The control center confirms that the defective product has completely passed through the position of the opening and closing plate and entered the feed inlet at the moment it receives the signal, and then triggers the subsequent action sequence. The pushing module stops supplying air and retracts and resets under the suction action. The lifting device drives the opening and closing plate to descend and close the recovery pipe channel. The sealing airbag exhausts and retracts into the sealing groove. The setting of the monitoring sensor enables the control center to accurately grasp the position status of the defective product. The action switching of each actuator no longer depends on the preset time delay but is based on the real-time feedback of the actual material position. This avoids the opening and closing plate closing too early and jamming the defective product or closing too late and causing heat loss due to inaccurate time estimation. It realizes the position closed-loop control of the entire process of pushing, dropping and resetting.

[0021] Preferably, the gas heating and circulation device is equipped with a gas pump for drawing gas. The gas pump inlet is fixedly connected to and communicates with the gas outlet pipe, and the gas pump outlet is fixedly connected to and communicates with the gas inlet pipe. The pushing module, lifting device and sealing airbag are all equipped with return gas pipes, which are connected to the gas pump inlet. The gas pump's suction drives the pushing module, lifting device and sealing airbag to quickly reset.

[0022] By adopting the above technical solution: under normal conditions, the gas pump draws gas from the insulated molten shell through the outlet pipe, heats it, and then sends it back into the insulated molten shell through the inlet pipe, forming a hot air circulation to maintain the molten temperature; when the pushing module, lifting device, and sealing airbag need to be reset, the suction action of the gas pump is transmitted to the air chamber of each actuator through each return air pipe, actively extracting the gas in each air chamber so that each actuator can be quickly reset under the combined action of the gas pump suction force and its own rebound force; this design uses the same gas pump to realize both the power supply for hot air circulation and the active reset of each pneumatic actuator without the need for additional vacuum pumps or reset air circuits, making full use of the characteristic of the gas pump to operate continuously during hot air circulation, solving the problem of rapid reset of each actuator without adding power equipment, simplifying the equipment structure and reducing manufacturing costs and energy consumption.

[0023] Preferably, the control center is equipped with a timing controller. After receiving a defective product identified by the identification module, the control center causes the timing controller to first close the air inlet pipe and open the main air supply pipe, then causes the push module to push the defective product into the recovery pipe, then controls the sealing airbag to expand and block the feeding channel between the guide cone and the feed inlet, and finally controls the lifting device to drive the opening and closing plate to open the recovery pipe. When the monitoring sensor transmits the signal that the defective product has passed through to the control center, the control center causes the timing controller to first control the lifting device to drive the opening and closing plate to seal the recovery pipe through the suction of the gas pump, and then simultaneously controls the push module to recover and the sealing airbag to retract into the sealing groove.

[0024] By adopting the above technical solution: the control center is equipped with a timing controller to precisely arrange the action sequence of each actuator. When the identification module determines that the current product is defective, the control center first sends a start signal to the timing controller. The timing controller executes the following control according to the predetermined sequence of the first set of action sequences: First, it controls the air inlet valve to close and the air supply main pipe to open, so that all airflow is supplied to the pushing module, the lifting device and the sealing airbag; Second, it controls the pushing module to supply air through the pushing air pipe, so that the pushing module pushes the defective product from the conveying pipe into the recovery pipe; Third, it controls the sealing air pipe of the sealing airbag to open, and the sealing airbag inflates and expands to block the feeding channel between the guide cone and the feed port; Fourth, it controls the lifting device to supply air through the lifting air pipe, and the lifting airbag inflates to push the opening and closing plate to rise and open the recovery pipe channel. The defective product slides in the recovery pipe under the action of gravity and passes through the feed port to enter the feed port of the heat preservation and melting shell. When the monitoring sensor detects that the defective product has completely passed through the feed inlet and transmits the signal to the control center, the timing controller executes the second set of action sequences to perform the following control: First, it controls the opening of the return air pipe at the lifting device, and the gas pump draws the lifting airbag through the return air pipe to make the opening and closing plate quickly descend and close the recovery pipe channel; then, it simultaneously controls the return air pipe of the pushing module to draw the air chamber of the pushing module through the gas pump to reset the pushing plate, and controls the return air pipe of the sealing airbag to draw the sealing airbag through the gas pump to make it retract back into the sealing groove; finally, it controls the opening of the air inlet valve and the closing of the main air source pipe to restore the hot air circulation. In the above-mentioned timing control logic, the sealing airbag is sealed before the opening and closing plate is opened, and the opening and closing plate is opened only after the sealing airbag is sealed, avoiding the window period of hot air leakage when the opening and closing plate is opened; the monitoring sensor confirms that the defective product has completely passed through before the opening and closing plate is closed and the sealing airbag is reset in sequence, avoiding the shearing of defective products when the opening and closing plate is closed or the clamping of materials when the sealing airbag retracts. The reset of each actuator is performed after the opening and closing plate is closed, ensuring that the internal seal is removed only after the melting chamber is resealed, eliminating heat loss. The entire timing control logic is interlocked and mutually dependent, realizing the safe, orderly and efficient operation of the entire defective product recycling process.

[0025] The working principle and beneficial effects of this application are as follows: 1. By integrating the visual recognition, automatic pushing, heating and melting of defective products with melt re-injection into the same equipment, a fully automated closed-loop circuit is formed from the generation of defective products to the direct re-injection of recycled melt into the injection unit. After being ejected from the ejector device of the mold closing device, the defective products enter the conveying pipeline. During the conveying process, the recognition module completes online quality judgment. Once determined to be defective, the pushing module immediately pushes it to the recycling pipe and enters the heating module for melting. The melted recycled melt is directly conveyed to the injection unit to participate in the next molding. The entire process eliminates the need for manual collection and transportation of defective products, the need for offline centralized stacking after cooling to room temperature, and the need for crushing and granulation processes. It eliminates all intermediate links such as collection, transportation, sorting, crushing, granulation, storage, and re-mixing, thereby shortening the recycling cycle and reducing labor and material transportation costs.

[0026] 2. By connecting the main air supply pipe of the drive push module to the air inlet pipe of the hot air circulation system, under normal circumstances, the airflow in the hot air circulation system, as a heating medium, flows through the air inlet pipe into the insulated melting shell to heat and melt defective products. When the air inlet valve is closed, the main air supply pipe can also be used as the power source for the push module, realizing the multi-purpose utilization of the single air source kinetic energy, without the need to configure a separate power source for the push module. The air inlet valve on the air inlet pipe is located downstream of the main air supply pipe. Under normal circumstances, the air inlet valve is open and the airflow enters the insulated melting shell through the air inlet pipe to maintain hot air circulation. When it is necessary to push defective products, the air inlet valve is closed to cut off the air supply from the air inlet pipe to the insulated melting shell, so that all the airflow enters the push module through the main air supply pipe, ensuring that the push module obtains sufficient air pressure and flow to complete the push action. At the same time, it avoids the risk of heat loss and personnel burns caused by hot air leakage from the recovery pipe and the delivery pipe during the push process, and ensures the stability of the temperature field in the melting chamber.

[0027] 3. By setting up a timing controller in the control center, the action sequence of each actuator is precisely arranged. When the identification module determines that the current product is defective, the control center first sends a start signal to the timing controller. The timing controller executes the following control according to the predetermined sequence of the first set of actions: First, it controls the air inlet valve to close and the air supply main pipe to open, so that all airflow is supplied to the push module, the lifting device and the sealing airbag; Second, it controls the push module to supply air through the pushing air pipe, so that the push module pushes the defective product from the conveying pipe into the recovery pipe; Third, it controls the sealing air pipe of the sealing airbag to open, and the sealing airbag inflates and expands to block the feeding channel between the guide cone and the feed port; Fourth, it controls the lifting device to supply air through the lifting air pipe, and the lifting airbag inflates to push the opening and closing plate to rise and open the recovery pipe channel. The defective product slides in the recovery pipe under the action of gravity and passes through the feed port to enter the feed port of the heat preservation melting shell. When the monitoring sensor detects that the defective product has completely passed through the feed inlet and transmits the signal to the control center, the timing controller executes the second set of action sequences to perform the following control: First, it controls the opening of the return air pipe at the lifting device, and the gas pump draws the lifting airbag through the return air pipe to make the opening and closing plate quickly descend and close the recovery pipe channel; then, it simultaneously controls the return air pipe of the pushing module to draw the air chamber of the pushing module through the gas pump to reset the pushing plate, and controls the return air pipe of the sealing airbag to draw the sealing airbag through the gas pump to make it retract back into the sealing groove; finally, it controls the opening of the air inlet valve and the closing of the main air source pipe to restore the hot air circulation. In the above-mentioned timing control logic, the sealing airbag is sealed before the opening and closing plate is opened, and the opening and closing plate is opened only after the sealing airbag is sealed, avoiding the window period of hot air leakage when the opening and closing plate is opened; the monitoring sensor confirms that the defective product has completely passed through before the opening and closing plate is closed and the sealing airbag is reset in sequence, avoiding the shearing of defective products when the opening and closing plate is closed or the clamping of materials when the sealing airbag retracts. The reset of each actuator is performed after the opening and closing plate is closed, ensuring that the internal seal is removed only after the melting chamber is resealed, eliminating heat loss. The entire timing control logic is interlocked and mutually dependent, realizing the safe, orderly and efficient operation of the entire defective product recycling process. Attached Figure Description

[0028] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 This is a schematic diagram of the structure of an injection molding equipment for producing plastic products according to this application; Figure 2 This is a structural schematic diagram of an injection molding equipment for producing plastic products according to this application from another perspective. Figure 3 This is a schematic diagram of the plastic recycling system portion of this application; Figure 4 This is a schematic diagram of the push module and lifting device of this application; Figure 5 This is a schematic diagram of the flow guide cone and sealing airbag of this application.

[0030] The technical features in the attached drawings are labeled as follows: 1. Machine body; 11. Injection unit; 12. Mold closing unit; 2. Plastic recycling system; 21. Conveying pipe; 22. Identification module; 23. Recycling pipe; 3. Pushing module; 31. Fixing pipe; 32. Piston plate; 33. Piston rod; 34. Pusher plate; 35. Pushing air pipe; 36. Pushing inlet solenoid valve; 37. Pushing return pipe; 38. Pushing exhaust solenoid valve; 4. Heating module; 41. Insulated melting shell; 42. Feed port; 43. Hot air circulation system; 431. Air inlet pipe; 432. Gas heating and circulation device; 4321. Gas pump; 4322. Heater; 43 3. Exhaust pipe; 434. Intake valve; 435. Exhaust valve; 436. Melt pump; 5. Main air supply pipe; 6. Opening and closing plate; 7. Lifting device; 71. Lifting airbag; 72. Lifting plate; 73. Fixing ring; 731. Lifting groove; 74. Sliding ring; 75. Lifting air pipe; 76. Lifting intake solenoid valve; 77. Lifting return pipe; 78. Lifting exhaust solenoid valve; 8. Guide cone; 81. Sealing groove; 9. Sealing airbag; 91. Sealing air pipe; 92. Sealing intake solenoid valve; 93. Sealing return pipe; 94. Sealing exhaust solenoid valve; 10. Monitoring sensor; 20. Return air pipe. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1 like Figures 1-2As shown, this embodiment provides an injection molding equipment for producing plastic products, including a body 1 with an injection unit 11 and a mold clamping unit 12, and a plastic recycling system 2. The mold clamping unit 12 has an ejection device for ejecting finished products, which is connected to the plastic recycling system 2. The plastic recycling system 2 includes a conveying pipe 21 disposed on the material discharge side of the mold clamping unit 12, an identification module 22 disposed in the conveying pipe 21 for identifying defective products, a recycling pipe 23 disposed downstream of the identification module 22, a pushing module 3 disposed corresponding to the recycling pipe 23 for pushing defective products from the conveying pipe 21 into the recycling pipe 23, and a melting device for melting the defective products. The heating module 4 and the recovery pipe 23 are equipped with an opening and closing plate 6 at one end near the inlet 42 of the insulated melting shell 41 for controlling the connection between the recovery pipe 23 and the insulated melting shell 41. The opening and closing plate 6 is equipped with a lifting device 7 for driving the opening and closing plate 6 to rise and fall. The identification module 22 is connected to the control center, which is used to control the pushing module 3 and the lifting device 7. The heating module 4 is connected to the injection device 11 of the machine body 1 for conveying the heated and molten plastic into the injection device 11 of the machine body 1. The identification module 22, the recovery pipe 23, the pushing module 3 and the heating module 4 are connected in sequence along the processing path of defective products to form a fully automatic closed loop for defective product recycling. In this embodiment, the conveying pipe 21 is horizontally arranged on the unloading side of the mold closing device 12. After the ejection device of the mold closing device 12 ejects the molded product, it falls directly into one end of the conveying pipe 21. The other end of the conveying pipe 21 is divided into a good product outlet. The identification module 22 is arranged in the middle section of the conveying pipe 21 and includes an industrial camera and an image processing unit for online image acquisition and quality judgment of the passing products. The recycling pipe 23 is inclinedly arranged downstream of the identification module 22. The pushing module 3 is arranged on the side wall of the conveying pipe 21 and is correspondingly arranged with the recycling pipe 23.

[0033] like Figures 2-3As shown, the heating module 4 includes a sealed, insulated melting shell 41. The top of the shell has an inlet 42 connected to the recovery pipe 23. The heating module 4 is equipped with a hot air circulation system 43 for heating defective products. The hot air circulation system 43 includes an inlet pipe 431, a gas heating and circulation device 432, and an outlet pipe 433. The gas heating and circulation device 432 heats the airflow and drives it to circulate. Both the inlet pipe 431 and the outlet pipe 433 are fixedly connected to and communicate with the shell. A main air supply pipe 5 is provided on the inlet pipe 431 for supplying power to the pushing module 3 and the lifting module 23. Device 7 provides kinetic energy. An intake valve 434, located downstream of the main gas supply pipe 5, is installed on the intake pipe 431. The intake valve 434 controls the opening and closing of the intake pipe 431. An outlet valve 435 is installed on the outlet pipe 433 to control its opening and closing. In this embodiment, the intake pipe 431 is connected to the upper side wall of the insulating molten shell 41, and the outlet pipe 433 is connected to the lower side wall of the insulating molten shell 41. Both the intake pipe 431 and the outlet pipe 433 communicate with the internal chamber of the insulating molten shell 41, and a gas is connected between the intake pipe 431 and the outlet pipe 433. The gas heating circulation device 432 includes a heater 4322 for heating the gas and a gas pump 4321 for driving the gas circulation. The gas pump 4321 has both suction and positive pressure delivery functions. Its inlet is fixedly connected to and communicates with the outlet pipe 433, and its outlet is fixedly connected to and communicates with the inlet pipe 431. Under normal conditions, the gas pump 4321 draws gas from the heat-insulating molten shell 41 from the outlet pipe 433, heats it through the heater 4322, and then sends it back to the heat-insulating molten shell 41 through the inlet pipe 431, forming a heat exchanger. Air circulation is used to maintain the melting temperature; the interior of the insulated melting shell 41 is equipped with a stirring device and a filter screen. The stirring device is located in the middle of the shell to agitate the defective products during the melting process so that they are heated evenly. The filter screen is located at the bottom of the shell to filter impurities in the molten plastic. The filtered pure melt is collected through a melt buffer chamber located at the bottom of the shell. The melt buffer chamber is connected to the barrel of the injection device 11 through an insulated pipe. A melt pump 436 is installed on the insulated pipe. The melt pump 436 pumps the recycled melt in a molten state into the barrel of the injection device 11 to participate in molding.

[0034] like Figures 3-4As shown, the pushing module 3 includes a fixed pipe 31 connected to the air source main pipe 5, a piston plate 32 slidably connected to the fixed pipe 31, a piston rod 33 fixedly connected to the piston plate 32, and a pusher plate 34 for pushing defective products. The fixed pipe 31 is fixedly connected to the side wall of the conveying pipe 21. The piston plate 32 is located inside the fixed pipe 31 and is sealed to the inner wall of the fixed pipe 31. The end of the piston rod 33 away from the piston plate 32 passes through the side wall of the conveying pipe 21 and is located inside the conveying pipe 21. The piston rod 33 is slidably connected to the side wall of the conveying pipe 21, and the piston rod 33 is located at one end of the conveying pipe 21. The pusher is fixedly connected to the pusher plate 34. A pusher pipe 35 is provided between the fixed pipe 31 and the air source main pipe 5. The interface between the pusher pipe 35 and the fixed pipe 31 is located between the piston plate 32 and the bottom wall of the fixed pipe 31. A pusher inlet solenoid valve 36 is provided on the pusher pipe 35. The pusher module 3 is also provided with a pusher return pipe 37. One end of the pusher return pipe 37 is connected to the inner cavity of the fixed pipe 31 and the interface is located between the piston plate 32 and the bottom wall of the fixed pipe 31. The other end of the pusher return pipe 37 is connected to the air inlet of the gas pump 4321. A pusher exhaust solenoid valve 38 is provided on the pusher return pipe 37. When a defective product is detected and needs to be pushed, the air intake solenoid valve 36 is opened, and the airflow output from the main air supply pipe 5 enters the chamber between the piston plate 32 and the bottom wall of the fixed pipe 31 through the push air pipe 35. As the gas continues to enter the chamber, the air pressure rises, pushing the piston plate 32 to slide away from the bottom wall of the fixed pipe 31. The piston plate 32 drives the piston rod 33 to move synchronously, causing the piston rod 33 to push the pusher plate 34 to smoothly push the defective product located in the conveying pipe 21 into the recovery pipe 23. After the pushing is completed, the air intake solenoid valve 36 is closed and the exhaust solenoid valve 38 is opened. The gas pump 4321 sucks the chamber in the fixed pipe 31 by pushing the return pipe 37, causing the piston plate 32 to slide back and reset under negative pressure, driving the pusher plate 34 to return to the outside of the side wall of the conveying pipe 21 to restore the unobstructed passage of the conveying pipe 21. In this embodiment, the fixed pipe 31 is perpendicular to the conveying pipe 21. The piston plate 32 is a circular metal plate with a sealing ring embedded on its outer circumference, which slides and seals with the inner wall of the fixed pipe 31. The piston rod 33 is a stainless steel round rod with a diameter smaller than that of the piston plate 32. One end of the piston rod 33 is welded and fixed to the center of the piston plate 32, and the other end passes through the side wall of the conveying pipe 21 and extends into the interior of the conveying pipe 21. The pusher plate 34 is in clearance fit with the inner bottom wall of the conveying pipe 21.

[0035] like Figures 3-4As shown, the lifting device 7 is connected to the air source main pipe 5. The lifting device 7 includes a lifting airbag 71 connected to the air source main pipe 5, a lifting plate 72 fixedly connected to the opening and closing plate 6, a fixing ring 73 sleeved on the outside of the lifting airbag 71, and a sliding ring 74 slidably connected to the fixing ring 73. The top end of the fixing ring 73 is provided with a lifting groove 731. The top end of the sliding ring 74 is fixedly connected to the lifting plate 72, and the end of the sliding ring 74 away from the lifting plate 72 is located in the lifting groove 731. The lifting airbag 71 is set in the lifting groove 731 to push the sliding ring 74 up and down. A lifting air pipe 75 is provided between the lifting airbag 71 and the air source main pipe 5, and a lifting air intake solenoid valve 76 is provided on the lifting air pipe 75. The lifting device 7 is also provided with a corresponding lifting return pipe 77. One end of the lifting return pipe 77 is connected to the lifting airbag 71 and the other end is connected to the air inlet of the gas pump 4321. A lifting exhaust solenoid valve 78 is provided on the lifting return pipe 77. When the opening / closing plate 6 needs to be opened, the lifting air intake solenoid valve 76 opens, and the airflow in the air source main pipe 5 enters the lifting airbag 71, inflating and pushing the sliding ring 74 to slide upward along the lifting groove 731. The sliding ring 74 drives the lifting plate 72 and the opening / closing plate 6 to rise synchronously, opening the channel between the recovery pipe 23 and the inlet 42 of the heat preservation melting shell 41. When the opening / closing plate 6 needs to be closed, the lifting air intake solenoid valve 76 closes, and the lifting exhaust solenoid valve 78 opens, causing the gas pump 4321 to draw gas from the lifting airbag 71 through the lifting return pipe 77. After the gas in the lifting airbag 71 is drawn out, it contracts, and the sliding ring 74 slides downward along the lifting groove 731 and resets under its own weight and the combined weight of the lifting plate 72 and the opening / closing plate 6, thereby driving the opening / closing plate 6 to descend and close the channel of the recovery pipe 23. In this embodiment, the fixing ring 73 is an annular structure and is fixed to the outer wall of the recovery pipe 23. The upper end face of the fixing ring 73 is provided with an annular lifting groove 731. The lifting airbag 71 is annular and is embedded in the bottom of the lifting groove 731. The air inlet of the lifting airbag 71 is connected to the air source main pipe 5 through the lifting air pipe 75. The sliding ring 74 is an annular structure and is sleeved on the outer wall of the recovery pipe 23. The lower end of the sliding ring 74 is inserted into the lifting groove 731 and slides with the inner wall of the lifting groove 731. The upper end of the sliding ring 74 is welded and fixed to the lower surface of the lifting plate 72. The lifting plate 72 is horizontally set and fixedly connected to the upper end of the opening and closing plate 6. The opening and closing plate 6 is vertically set inside the recovery pipe 23. The diameter of the opening and closing plate 6 is adapted to the inner diameter of the recovery pipe 23. The upper end of the opening and closing plate 6 is fixedly connected to the lifting plate 72 through a vertical connecting rod.

[0036] like Figure 4As shown, a monitoring sensor 10 for monitoring the passage of defective products is provided downstream of the opening and closing plate 6 inside the recycling pipe 23. The monitoring sensor 10 is connected to the control center. In this embodiment, the monitoring sensor 10 is a photoelectric sensor, which is set on both sides of the pipe wall below the opening and closing plate 6 inside the recycling pipe 23. The transmitting end and receiving end of the photoelectric sensor are respectively embedded in the inner wall on opposite sides of the recycling pipe 23. When the defective product falls through the detection area, it blocks the light path, causing the signal at the receiving end to change. The monitoring sensor 10 transmits the signal to the control center to confirm that the defective product has passed through the position.

[0037] like Figures 3-5 As shown, a guide cone 8 for diverting recycled defective products is provided at the feed inlet 42. The guide cone 8 is fixedly connected to the heat-insulating melting shell 41. A sealing groove 81 is provided at one end of the guide cone 8 near the feed inlet 42. A sealing airbag 9 for sealing the feed channel between the feed inlet 42 and the guide cone 8 is embedded in the sealing groove 81. A sealing air pipe 91 is provided between the sealing airbag 9 and the air source main pipe 5, and a sealing air inlet solenoid valve 92 is provided on the sealing air pipe 91. The sealing airbag 9 is also provided with a corresponding sealing return pipe 93, and a sealing exhaust solenoid valve 94 is provided on the sealing return pipe 93. One end of the sealing return pipe 93 is connected to the sealing airbag 9 and the other end is connected to the air inlet of the gas pump 4321. When it is necessary to block the feed channel, the sealing inlet solenoid valve 92 is first opened, and the sealing airbag 9 inflates and protrudes from the sealing groove 81 to completely block the annular feed channel between the feed inlet 42 and the guide cone 8 from the inside. When it is necessary to restore the feed channel, the sealing inlet solenoid valve 92 is closed and the sealing exhaust solenoid valve 94 is opened. The gas pump 4321 draws gas from the sealing airbag 9 through the sealing return pipe 93, causing the gas in the sealing airbag 9 to be extracted and then contracted back into the sealing groove 81. In this embodiment, the guide cone 8 is generally conical in shape, with its cone apex facing upwards and directly opposite the center of the feed inlet 42. The cone bottom is fixedly connected to the inner wall of the heat-insulating melting shell 41. An annular feed channel is left between the cone apex of the guide cone 8 and the feed inlet 42. An annular sealing groove 81 is opened on the outer circumference of the guide cone 8 near the cone apex. The sealing airbag 9 is an annular airbag and is embedded in the sealing groove 81. In the contracted state, the outer surface of the sealing airbag 9 is not higher than the outer surface of the guide cone 8, and the feed channel remains unobstructed. In this embodiment, a return air pipe 20 is provided between the push return pipe 37, the lift return pipe 77, the sealing return pipe 93 and the air outlet pipe 433. The return air pipe 20 connects the push return pipe 37, the lift return pipe 77 and the sealing return pipe 93 to the air outlet pipe 433. The return air pipe 20 is located on the side of the air outlet valve 435 away from the heat preservation and melting shell 41.

[0038] Example 2 like Figures 1-5As shown, the difference between this embodiment and Embodiment 1 is that the control center in this embodiment is equipped with a timing controller. All solenoid valves, including the intake solenoid valve 36, the exhaust solenoid valve 38, the intake solenoid valve 76, the exhaust solenoid valve 78, the intake solenoid valve 92, the exhaust solenoid valve 94, the intake valve 434, and the exhaust valve 435, are connected to the timing controller, which controls the opening and closing sequence of each solenoid valve. After receiving the defective product signal determined by the identification module 22, the control center instructs the timing controller to execute control according to the following first set of action sequences: In the first step, the timing controller controls the intake valve 434 to close and simultaneously controls the air circuit valve corresponding to the air source main pipe 5 to open. After the intake valve 434 is closed, the air supply from the intake pipe 431 to the heat insulation molten shell 41 is cut off, the hot air circulation is temporarily interrupted, and the airflow output by the gas pump 4321 cannot enter the heat insulation molten shell 41 through the intake pipe 431. All the airflow flows through the air source main pipe 5 to the pneumatic pipeline where the push module 3, the lifting device 7 and the sealing airbag 9 are located.

[0039] In the second step, the timing controller controls the opening of the air intake solenoid valve 36. The airflow enters the chamber between the piston plate 32 and the bottom wall of the fixed pipe 31 through the pushing air pipe 35. As the gas continues to enter the chamber, the air pressure increases, pushing the piston plate 32 to slide away from the bottom wall of the fixed pipe 31. The piston plate 32 drives the piston rod 33 to move synchronously, causing the piston rod 33 to push the pusher plate 34 to smoothly push the defective products located in the conveying pipe 21 into the recycling pipe 23. After the products are pushed into place, the timing controller controls the closing of the air intake solenoid valve 36.

[0040] Third, the timing controller controls the sealing air inlet solenoid valve 92 to open, and the airflow enters the sealing airbag 9 from the air source main pipe 5 through the sealing air pipe 91. After the sealing airbag 9 is inflated and expands, it protrudes out of the sealing groove 81 and completely blocks the annular feeding channel between the feed inlet 42 and the guide cone 8 from the inside. After a certain period of time, the timing controller controls the sealing air inlet solenoid valve 92 to close. During the period when the sealing airbag 9 blocks the feeding channel, even if the opening and closing plate 6 is in the open state, the high temperature gas in the heat preservation molten shell 41 is still effectively blocked by the sealing airbag 9 and cannot escape upward to the recovery pipe 23.

[0041] In the fourth step, the timing controller controls the lifting air intake solenoid valve 76 to open, and the airflow enters the lifting air bag 71 through the lifting air pipe 75, causing the lifting air bag 71 to inflate in the lifting groove 731 of the fixed ring 73. The inflated lifting air bag 71 pushes the sliding ring 74 upward, causing the sliding ring 74 to slide upward along the lifting groove 731. The sliding ring 74 drives the lifting plate 72 and the opening and closing plate 6 to rise synchronously, opening the channel between the recovery pipe 23 and the inlet 42 of the heat insulation and melting shell 41. The defective product is pushed into the recovery pipe 23 by the pusher plate 34 and falls down along the recovery pipe 23 under the action of gravity, passing through the inlet 42 and entering the inlet 42 of the heat insulation and melting shell 41. After the opening and closing plate 6 is in place, the timing controller controls the lifting air intake solenoid valve 76 to close.

[0042] After the monitoring sensor 10 detects that the defective product has completely passed through the feed inlet 42 and transmits the signal to the control center, the timing controller executes control according to the following second set of action sequences: In the first step, the timing controller controls the outlet valve 435 to close the outlet pipe 433, and at the same time controls the gas valve corresponding to the return pipe 20 to open. After the outlet valve 435 is closed, the suction from the outlet pipe 433 to the heat insulation molten shell 41 is cut off, the hot air circulation is temporarily interrupted, and the gas pump 4321 cannot extract gas from the heat insulation molten shell 41 through the outlet pipe 433. All the suction force generated by the suction is transmitted to the return pipeline where the push module 3, the lifting device 7 and the sealing airbag 9 are located through the return pipe 20. At this time, the valve of the gas source main pipe 5 is closed and the air inlet valve 434 of the inlet pipe 431 is opened to deliver airflow into the heat insulation molten shell 41.

[0043] In the second step, the timing controller controls the lifting exhaust solenoid valve 78 to open, and the gas pump 4321 draws gas from the lifting airbag 71 through the lifting return pipe 77. After the gas in the lifting airbag 71 is drawn out, it contracts, and the superimposed sliding ring 74 slides down and resets along the lifting groove 731 under its own weight and the combined weight of the lifting plate 72 and the opening and closing plate 6, driving the opening and closing plate 6 to descend and close the recovery pipe 23 channel. The gas in the lifting airbag 71 enters the heating device through the gas pump 4321 for heating and is then transported to the heat preservation and melting shell 41 through the air inlet pipe 431. After closing, the timing controller controls the lifting exhaust solenoid valve 78 to close. After the opening and closing plate 6 closes, the connection between the recovery pipe 23 and the heat preservation and melting shell 41 is blocked by the first seal.

[0044] Third, the timing controller simultaneously controls the opening of the exhaust solenoid valve 38 and the sealing exhaust solenoid valve 94. The gas pump 4321 draws air from the chamber between the piston plate 32 and the bottom wall of the fixed pipe 31 through the return pipe 37. Under negative pressure, the piston plate 32 slides back to its original position, causing the pusher plate 34 to retract to the outside of the side wall of the conveying pipe 21, restoring the unobstructed passage of the conveying pipe 21. At the same time, the gas pump 4321 draws air from the sealing airbag 9 through the sealing return pipe 93. After the gas in the sealing airbag 9 is drawn out, it retracts back into the sealing groove 81, restoring the feeding channel. The defective product continues to fall under the action of gravity, passing through the feeding channel and evenly dispersing along the conical surface of the guide cone 8 to the surrounding area of ​​the heat-insulating melting shell 41. The gas in the fixed pipe 31 and the sealing airbag 9 enters the heating device through the gas pump 4321, is heated, and then transported to the heat-insulating melting shell 41 through the air inlet pipe 431. After resetting to the correct position, the timing controller controls the closing of the exhaust solenoid valve 38 and the sealing exhaust solenoid valve 94.

[0045] Third, the timing controller controls the opening of the air outlet valve 435 on the air outlet pipe 433, so that the airflow comes out of the air outlet pipe 433, passes through the gas pump 4321, the heating device and the air inlet pipe 431 and enters the heat preservation and melting shell 41, so that the hot air circulation is restored. The heat preservation and melting shell 41 heats and melts the dispersed defective products.

[0046] In the above timing control logic, the sealing airbag 9 completes the sealing before the opening and closing plate 6 opens, and the opening and closing plate 6 only opens after the sealing airbag 9 completes the sealing, avoiding the window period of hot air leakage when the opening and closing plate 6 opens; the monitoring sensor 10 confirms that the defective product has completely passed through before closing the opening and closing plate 6 and resetting the sealing airbag 9 in sequence, avoiding the shearing of the defective product when the opening and closing plate 6 closes or the clamping of the material when the sealing airbag 9 retracts; the reset of each actuator is performed after the opening and closing plate 6 closes, ensuring that the internal seal is removed only after the melting chamber is resealed, eliminating heat loss; the entire timing control logic is interlocked and mutually dependent, realizing the safe, orderly and efficient operation of the entire defective product recycling process. After the defective product falls into the heat-insulating melting shell 41, it is heated and melted by the hot air circulation system 43. The molten plastic enters the melt buffer chamber after being filtered by the filter screen, and is pumped by the melt pump 436 through the heat-insulating pipeline to the barrel of the injection device 11 to participate in the next molding.

[0047] The basic principle of this application is as follows: After the ejection device of the mold clamping device 12 ejects the molded product, the product falls into the conveying pipe 21 and passes through the detection area of ​​the identification module 22. The identification module 22 collects the product image through an industrial camera and performs online quality judgment by the image processing unit. If the product is judged to be good, it is discharged from the good product outlet along the conveying pipe 21 and enters the subsequent process. If the product is judged to be defective, the control center sends a start signal to the timing controller. The timing controller controls the air inlet valve 434 to close according to the first set of action sequences, so that the hot air is switched to the pneumatic pipeline. Then, it drives the pusher plate 34 to push the defective product into the recovery pipe 23, the sealing airbag 9 expands to block the feeding channel, and the opening and closing plate 6 opens to allow the defective product to enter the feeding port 42. After the monitoring sensor 10 detects that the defective product has passed through the feeding port 42, the timing controller... The second set of action sequence controls the closing of the opening and closing plate 6, the reset of the pusher plate 34, and the retraction of the sealing airbag 9 until the hot air circulation is finally restored. After being dispersed by the guide cone 8, the defective products are evenly distributed inside the heat-insulating melting shell 41. The high-temperature airflow provided by the hot air circulation system 43 heats and melts the defective products. During the melting process, the stirring device turns the material over to make the heating more uniform. After the molten plastic melt is filtered by the filter screen to remove impurities, it is pumped by the melt pump 436 through the heat-insulating pipeline to the barrel of the injection device 11, and directly participates in the next molding in a molten state. The entire process of defective products from identification to re-injection molding does not require manual intervention, cooling to room temperature, offline crushing and granulation, and the entire process is carried out in a closed channel to reduce external contamination of defective products, realizing fully automatic closed-loop recycling of defective products in the same equipment.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An injection molding machine for producing plastic products, characterized in that, The machine body (1) includes an injection device (11) and a mold clamping device (12) and a plastic recycling system (2). The mold clamping device (12) has an ejection device for ejecting finished products and the ejection device is connected to the plastic recycling system (2). The plastic recycling system (2) includes a conveying pipe (21) set on the material feeding side of the mold clamping device (12), an identification module (22) set in the conveying pipe (21) for identifying defective products, a recycling pipe (23) set downstream of the identification module (22), a pushing module (3) set corresponding to the recycling pipe (23) for pushing defective products from the conveying pipe into the recycling pipe (23), and a heating module (4) for melting defective products. The identification module (22) is connected to a control center, which is used to control the pushing module (3). The heating module (4) is connected to the injection device (11) of the machine body (1) for conveying the heated and melted plastic into the injection device (11) of the machine body (1). The identification module (22), recycling pipe (23), pushing module (3) and heating module (4) are connected sequentially along the processing path of defective products to form a fully automatic closed-loop circuit for defective product recycling.

2. The injection molding equipment for producing plastic products according to claim 1, characterized in that, The heating module (4) includes a sealed heat-insulating melting shell (41). The top of the shell is provided with an inlet (42) connected to the recovery pipe (23). The heating module (4) is provided with a hot air circulation system (43) for heating defective products. The hot air circulation system (43) includes an air inlet pipe (431), a gas heating circulation device (432), and an air outlet pipe (433). The gas heating circulation device (432) is used to heat the airflow and drive the airflow to circulate. The air inlet pipe (431) and the air outlet pipe (433) are both fixedly connected to and communicate with the shell. The air inlet pipe (431) is provided with a gas source main pipe (5) for providing kinetic energy to the push module (3). The air inlet pipe (431) is provided with an air inlet valve (434) located downstream of the gas source main pipe (5). The air inlet valve (434) is used to control the opening and closing of the air inlet pipe (431).

3. The injection molding equipment for producing plastic products according to claim 2, characterized in that, The pushing module (3) includes a fixed pipe (31) connected to the air source main pipe (5), a piston plate (32) slidably connected to the fixed pipe (31), a piston rod (33) fixedly connected to the piston plate (32), and a pusher plate (34) for pushing defective products. The fixed pipe (31) is fixedly connected to the side wall of the conveying pipe (21). The piston plate (32) is located inside the fixed pipe (31) and is sealed to the inner wall of the fixed pipe (31). The piston rod (33) is away from the piston plate. One end of (32) is located inside the conveying pipe (21) through the side wall of the conveying pipe (21). The piston rod (33) is slidably connected to the side wall of the conveying pipe (21). The piston rod (33) is fixedly connected to the pusher plate (34) at one end of the conveying pipe (21). A pusher pipe (35) is provided between the fixed pipe (31) and the air source main pipe (5). The interface between the pusher pipe (35) and the fixed pipe (31) is located between the piston plate (32) and the bottom wall of the fixed pipe (31).

4. The injection molding equipment for producing plastic products according to claim 2, characterized in that, The end of the recovery pipe (23) near the feed inlet (42) of the heat insulation and melting shell (41) is provided with an opening and closing plate (6) for controlling the connection between the recovery pipe (23) and the heat insulation and melting shell (41). The opening and closing plate (6) is provided with a lifting device (7) for driving the opening and closing plate (6) to rise and fall. The lifting device (7) is connected to the air source main pipe (5).

5. The injection molding equipment for producing plastic products according to claim 4, characterized in that, The lifting device (7) includes a lifting airbag (71) connected to the air source main pipe (5), a lifting plate (72) fixedly connected to the opening and closing plate (6), a fixing ring (73) sleeved on the outside of the lifting airbag (71), and a sliding ring (74) slidably connected to the fixing ring (73). The top end of the fixing ring (73) is provided with a lifting groove (731). The sliding ring (74) is fixedly connected to the lifting plate (72). The end of the sliding ring (74) away from the lifting plate (72) is located in the lifting groove (731). The lifting airbag (71) is set in the lifting groove (731) to push the sliding ring (74) up and down. A lifting air pipe (75) is provided between the lifting airbag (71) and the air source main pipe (5).

6. The injection molding equipment for producing plastic products according to claim 4, characterized in that, The feed inlet (42) is provided with a guide cone (8) for diverting the recycled defective products, and the guide cone (8) is fixedly connected to the heat-insulating melting shell (41).

7. The injection molding equipment for producing plastic products according to claim 6, characterized in that, The guide cone (8) is provided with a sealing groove (81) at one end near the feed inlet (42). A sealing airbag (9) for sealing the feed channel between the feed inlet (42) and the guide cone (8) is embedded in the sealing groove (81). A sealing air pipe (91) is provided between the sealing airbag (9) and the air source main pipe (5). The sealing airbag (9) is used to inflate and expand by the sealing air pipe (91) before the opening and closing plate (6) opens the recovery pipe (23) to seal the feed inlet (42). After the opening and closing plate (6) seals the recovery pipe (23) again, the sealing airbag (9) exhausts air and retracts into the sealing groove (81).

8. The injection molding equipment for producing plastic products according to claim 7, characterized in that, Downstream of the opening and closing plate (6) in the conveying pipeline (21), there is a monitoring sensor (10) for monitoring the passage of defective products. The monitoring sensor (10) is connected to the control center. After the monitoring sensor (10) detects that defective products have passed through, the control center controls the push module (3) to retract, the lifting device (7) to drive the opening and closing plate (6) to descend, and the sealing airbag (9) to exhaust and retract.

9. The injection molding equipment for producing plastic products according to claim 8, characterized in that, The gas heating and circulation device (432) is equipped with a gas pump (4321) for extracting gas. The inlet of the gas pump (4321) is fixedly connected to the outlet pipe (433) and communicates with it. The outlet of the gas pump (4321) is fixedly connected to the inlet pipe (431) and communicates with it. The push module (3), the lifting device (7) and the sealing airbag (9) are all equipped with return air pipes (20). The return air pipes (20) are connected to the inlet of the gas pump (4321). The gas pump (4321) is used to drive the push module (3), the lifting device (7) and the sealing airbag (9) to quickly reset.

10. An injection molding equipment for producing plastic products according to claim 9, characterized in that, The control center is equipped with a timing controller. After receiving the defective product determined by the identification module (22), the control center causes the timing controller to first close the air inlet pipe (431) and open the main air supply pipe (5), then cause the push module (3) to push the defective product into the recovery pipe (23), then control the sealing airbag (9) to expand and block the feeding channel between the guide cone (8) and the feed port (42), and finally control the lifting device (7) to drive the opening and closing plate (6) to open the recovery pipe (23). When the monitoring sensor (10) transmits the signal that the defective product has passed through to the control center, the control center causes the timing controller to first control the lifting device (7) to drive the opening and closing plate (6) to seal the recovery pipe (23) through the suction of the gas pump (4321), and then simultaneously control the push module (3) to recover and the sealing airbag (9) to retract into the sealing groove (81).

Images