A rapid forming device and method of a polylactic acid composite material for vehicle

Abstract

The application discloses a kind of quick forming device and method of poly-lactic acid composite for vehicle, belong to poly-lactic acid composite processing technical field, including fixed seat on rack, upper mould installed in the bottom of fixed seat, movable seat installed in the output end of hydraulic cylinder and lower mould fixed on the top of movable seat and cooperate with upper mould.The hot water storage mechanism of the application is composed of storage tank, shunt, second electromagnetic valve, first piston, return spring and through hole installed on the side of fixed seat, which can store high-temperature hot water generated in the early stage of cooling in the inside of storage tank during use, and preheat the mold with hot water after demolding is completed, improve the temperature of the mold, reduce the temperature difference between the mold and the poly-lactic acid composite during injection, effectively avoid the generation of internal bubbles of finished product, and then there is no need for long time pressure maintaining during injection, improve the product forming rate, and the waste heat can be utilized, which is more energy-saving.

Description

Technical Field

[0001] This invention relates to a rapid prototyping device for materials, and more particularly to a rapid prototyping device for automotive polylactic acid composite materials. The invention also relates to a method of using the rapid prototyping device for automotive polylactic acid composite materials, and belongs to the field of polylactic acid composite material processing technology. Background Technology

[0002] Polylactic acid (PLA), a high-strength, high-modulus biodegradable polyester, is currently widely used in the production of automotive parts. In the injection molding process of PLA composite automotive parts, to improve product quality and avoid internal air bubbles, the holding time and pressure are often increased during raw material injection. This method effectively eliminates air bubbles in the raw material, but it increases the injection time, thus reducing the molding rate. Furthermore, to accelerate demolding, a rapid prototyping mold, as disclosed in utility model publication CN217192199U, is used. This mold ejects the finished product via a motor drive. While this method improves the demolding rate, it still requires electric drive control, making it inconvenient to use.

[0003] To address this issue, a rapid prototyping device and method for automotive polylactic acid composite materials were designed to optimize the aforementioned problems. Summary of the Invention

[0004] The main objective of this invention is to provide a rapid prototyping device and method for automotive polylactic acid (PLA) composite materials. A hot water storage mechanism, consisting of a storage tank, a diversion pipe, a second solenoid valve, a first piston, a return spring, and a through-hole, is installed on the side of the fixed base. This mechanism stores the high-temperature hot water generated during the initial cooling phase of use within the storage tank. After demolding, the hot water is used to preheat the mold, increasing its temperature and reducing the temperature difference between the PLA composite material and the mold during injection. This effectively prevents the formation of air bubbles inside the finished product, eliminating the need for prolonged pressure holding during injection and increasing the product molding rate. Furthermore, it allows for the utilization of residual heat, resulting in greater energy efficiency. A melt cooling mechanism, consisting of a sleeve, a cylinder, a second piston, a one-way air inlet valve, an air guide pipe, a first one-way exhaust valve, an exhaust pipe, and a second one-way exhaust valve, is installed on the top of the fixed base. The injection molding machine barrel is located inside the sleeve. During mold opening, the upward movement of the sliding rod controls the sliding of the second piston inside the cylinder, injecting cold air from inside the cylinder into the sleeve to remove heat from the surface of the injection molding machine barrel. This cooling system further reduces the temperature of the molten material stored at the end of the injection molding machine barrel, preventing the formation of air bubbles inside the finished product and improving its practicality. Additionally, connecting the bottom of the exhaust pipe to the water inlet ensures complete drainage of the cooling water from the mold. Simultaneously, the hot air in the gas is used to preheat the mold again, improving preheating efficiency. The control structure, consisting of a first contact switch, a second contact switch inside the storage tank, and a third contact switch, a fourth contact switch inside the cylinder, controls the closing of the first solenoid valve and the opening of the second solenoid valve after mold closing. During cooling, once the storage tank is full of cooling water, the first contact switch opens the first solenoid valve, and the second contact switch closes the second solenoid valve, allowing the device to automatically control the circulation and drainage of hot water, making it more convenient to use. The ejection mechanism, consisting of a slide, a sliding plate, a first support rod, a second support rod, a push rod, a connecting rod, and a guide groove, is installed between the lower and upper mold sides. This mechanism automatically controls the upward movement of the push rod after the mold is fully opened, lifting the finished product without the need for electrical control, thus accelerating the product removal rate.

[0005] The objective of this invention can be achieved by adopting the following technical solution: A rapid prototyping device for automotive polylactic acid composite materials includes a fixed base fixed on a frame, an upper mold installed at the bottom of the fixed base, a movable base installed at the output end of a hydraulic cylinder, and a lower mold fixed on the top of the movable base and cooperating with the upper mold. A sliding rod is vertically mounted in a circular array on the outer side of the top of the movable base, and the sliding rod is slidably connected to the fixed base. Both the lower and upper molds have interconnected water inlet connectors at the same end, with water inlet pipes installed at the ends of the water inlet connectors. Both the lower and upper molds have interconnected drain connectors at the ends away from the water inlet connectors, with drain pipes installed at the ends of the drain connectors. A first solenoid valve is installed on the drain pipes. A hot water storage mechanism for storing and releasing hot water is provided at one end of the top of the fixed base. A melt cooling mechanism for cooling the molten material at the end of the barrel is provided at the top of the fixed base. An ejection mechanism for removing the product is provided at the inner top of the lower mold.

[0006] Preferably, the hot water storage mechanism includes a storage tank, a diversion pipe, and a second solenoid valve. The storage tank is fixed on a fixed base. A diversion pipe is provided between the bottom of the storage tank and the drain connector. A second solenoid valve is provided on the diversion pipe. A solution discharge mechanism is provided inside the storage tank. A control structure for controlling the opening and closing of the first and second solenoid valves is provided inside the storage tank.

[0007] Preferably, the solution discharge mechanism includes a first piston, a return spring, and a through hole. The first piston is slidably disposed at the inner bottom of the storage tank, and a return spring is installed between the top of the first piston and the inner top of the storage tank. A through hole is provided at the middle position of the top of the storage tank.

[0008] Preferably, the melt cooling mechanism includes a sleeve, a cylinder, a second piston, a one-way inlet valve, a guide pipe, a first one-way exhaust valve, an exhaust pipe, and a sealing mechanism. The sleeve is fixed to the top of the fixed base. The sleeve wraps around the outside of the injection molding machine barrel and leaves a gap between it and the outer wall of the barrel. A sealing mechanism is provided at the top of the sleeve. Cylinders are fixed at the four corners of the top of the fixed base. A second piston is slidably installed inside each cylinder. The top of each slide rod is fixedly connected to the bottom of the second piston. A guide pipe is provided between the top of the cylinder and the sleeve. A first one-way exhaust valve is installed on the guide pipe. A one-way inlet valve is provided at the top of the cylinder. An exhaust pipe is installed at the bottom of the sleeve.

[0009] Preferably, the bottom end of the exhaust pipe is connected to the inside of the water inlet connector, and a second one-way exhaust valve is installed on the exhaust pipe.

[0010] Preferably, a spiral blade is installed at the bottom of the inner side of the insert, the connection between the air guide tube and the insert is located above the spiral blade, and the inner side of the spiral blade is in contact with the barrel of the injection molding machine.

[0011] Preferably, the sealing mechanism includes a retaining ring, a rubber sealing ring, and a pressure cap. The retaining ring is fixed to the inner top of the insert, and the pressure cap is threaded onto the top of the insert. A rubber sealing ring is installed between the bottom of the pressure cap and the top of the retaining ring. The cross-sectional shape of the rubber sealing ring is V-shaped.

[0012] Preferably, the control structure includes a first contact switch, a second contact switch, a third contact switch, and a fourth contact switch. The first contact switch is installed on one side inside the storage tank, the second contact switch is installed on the other side inside the storage tank, the third contact switch is installed on one side of the top of the cylinder, and the fourth contact switch is installed on the other side of the top of the cylinder. The second and third contact switches are electrically connected to the second solenoid valve via wires, and both the first and fourth contact switches are electrically connected to the first solenoid valve via wires.

[0013] Preferably, the ejection mechanism includes a slide, a slide plate, a first support rod, a second support rod, a push rod, a connecting rod, and a guide groove. The slide is symmetrically opened on both sides of the lower mold. The slide plate is vertically installed inside the slide. The first support rod is hinged to the middle position of the outer side of the slide plate. The top of the first support rod is hinged to the outer side of the upper mold. The push rod is vertically slidably installed at the four corners of the top of the lower mold. The bottom end of the push rod is fixedly installed between the slide plate and the slide plate. The guide groove that cooperates with the connecting rod is vertically opened inside the lower mold.

[0014] The present invention also provides a method of using a rapid prototyping device for automotive polylactic acid composite materials, comprising the following steps: Step 1: During installation, connect the output end of the hydraulic cylinder vertically to the bottom of the movable seat, fix the fixed seat on the frame, insert the injection molding machine barrel into the inside of the insert sleeve, align it with the pouring port at the top of the upper mold, and then rotate the pressure cap to squeeze the rubber sealing ring to seal the top of the insert sleeve with the outside of the barrel. Step 2: When the mold is closed, the hydraulic cylinder controls the vertical movement of the slide rod at the top of the movable seat. The slide rod pushes the second piston upward to slide, pushing the gas inside the cylinder into the inside of the insert to cool the end of the barrel, thereby cooling the molten material and expelling the hot air from the exhaust pipe. Since the exhaust pipe is connected to the water inlet connector, the hot air removes the cooling water inside the lower and upper molds and preheats the lower and upper molds. Step 3: After the mold is closed, the molten material is injected into the lower and upper molds. The temperature difference between the molten material and the lower and upper molds is reduced, effectively preventing the formation of air bubbles. After the molten material is injected, cooling water enters the lower and upper molds through the water inlet pipe and water inlet connector to cool them down. The initial cooling water is heated to a higher temperature by the residual heat inside the lower and upper molds. At this time, the first solenoid valve is closed and the second solenoid valve is open. Hot water is stored in the storage tank. The reset spring inside the storage tank increases the resistance when hot water enters, slows down the delivery rate of cooling water, and ensures the heating effect of the initial cooling water. After storing a certain amount, the first piston rises and squeezes the first and second contact switches, closing the second solenoid valve and activating the first solenoid valve, completing the storage of hot water and discharging the remaining cooling water from the drain pipe. Step 4: When the hot water stored in the storage tank is used for the next mold closing, after the hot air preheats the interior of the lower and upper molds, the second piston moves to the top of the cylinder. The second piston squeezes and controls the third and fourth contact switches, opening the second solenoid valve and closing the first solenoid valve, allowing the hot water to flow into the interior of the lower and upper molds for reheating. Through double preheating, the temperature of the lower and upper molds is increased. At the same time, the first piston is reset under the force of the reset spring. Step 5: When the mold opens, the lower mold separates from the upper mold. After reaching the initial position, the second support rod, together with the first support rod, will pull the slide upward. At this time, the slide, together with the connecting rod, will drive the ejector rod to move upward, lifting the product upward so that the product can be quickly demolded and removed.

[0015] The beneficial effects of this invention are as follows: This invention provides a rapid prototyping device and method for automotive polylactic acid composite materials. By installing a hot water storage mechanism consisting of a storage tank, a diversion pipe, a second solenoid valve, a first piston, a return spring, and a through hole on the side of the fixed base, the device can store the high-temperature hot water generated during the initial cooling process inside the storage tank. After demolding, the hot water is used to preheat the mold, increasing the mold temperature and reducing the temperature difference between the polylactic acid composite material and the mold during injection. This effectively avoids the generation of air bubbles inside the finished product, eliminating the need for prolonged pressure holding during injection, thus improving the product molding rate. At the same time, it can utilize waste heat, making it more energy-efficient. By installing a melt cooling mechanism consisting of a sleeve, cylinder, second piston, one-way air inlet valve, air guide pipe, first one-way exhaust valve, exhaust pipe, and second one-way exhaust valve on the top of the fixed base, the injection molding machine barrel is located inside the sleeve. During the mold opening process, the upward movement of the slide rod controls the sliding of the second piston inside the cylinder, injecting the cold air inside the cylinder into the sleeve, removing the heat from the surface of the injection molding machine barrel, thereby cooling the molten material stored at the end of the injection molding machine barrel. This also avoids the generation of air bubbles inside the finished product, making it more practical. In addition, connecting the bottom end of the exhaust pipe to the water inlet connector ensures the complete discharge of cooling water inside the mold. At the same time, the hot air in the gas is used to preheat the mold again, improving the utilization rate of preheating. Through the control structure composed of the first contact switch and the second contact switch inside the storage tank, and the third contact switch and the fourth contact switch inside the cylinder, after the mold closing is completed, the third contact switch controls the closing of the first solenoid valve, and the fourth contact switch controls the opening of the second solenoid valve. When cooling, after the cooling water fills the storage tank, the first contact switch opens the first solenoid valve, and the second contact switch closes the second solenoid valve, so that the device can automatically control the circulation injection and discharge of hot water when in use, making it more convenient to use. By setting a sliding groove, sliding plate, first support rod, second support rod, ejector rod, connecting rod, and guide groove between the two sides of the lower mold and the upper mold, the ejector rod can be automatically controlled to move upward after the mold is fully opened, thus lifting the finished product without the need for power control and speeding up the removal rate of the finished product. Attached Figure Description

[0016] Figure 1 This is a front view of a preferred embodiment of the rapid prototyping device and method for automotive polylactic acid composite materials of the present invention; Figure 2 This is a diagram of a melt cooling mechanism in a preferred embodiment of a rapid prototyping device and method for automotive polylactic acid composite materials according to the present invention; Figure 3 This is a cross-sectional view of the insert in a preferred embodiment of the rapid prototyping device and method for automotive polylactic acid composite materials of the present invention; Figure 4 This is a preferred embodiment of the pressure cap structure of the rapid prototyping device and method for automotive polylactic acid composite materials of the present invention; Figure 5 This is a cross-sectional view of the cylinder interior in a preferred embodiment of the rapid prototyping device and method for automotive polylactic acid composite materials of the present invention. Figure 6 This is a diagram of a hot water storage mechanism in a preferred embodiment of a rapid prototyping device and method for automotive polylactic acid composite materials according to the present invention; Figure 7This is a side sectional view of the lower mold in a preferred embodiment of the rapid prototyping device and method for automotive polylactic acid composite materials of the present invention; Figure 8 This is a diagram showing the connection state between the lower mold and the upper mold in a preferred embodiment of the rapid prototyping device and method for automotive polylactic acid composite materials of the present invention.

[0017] In the diagram: 1. Movable seat; 2. Lower mold; 3. Fixed seat; 4. Upper mold; 5. Slide rod; 6. Water inlet connector; 7. Drain connector; 8. Water inlet pipe; 9. Drain pipe; 10. First solenoid valve; 11. Hot water storage mechanism; 12. Melt cooling mechanism; 13. Ejection mechanism; 14. Storage tank; 15. Diverter pipe; 16. Second solenoid valve; 17. First piston; 18. Return spring; 19. Through hole; 20. First contact switch; 21. Second contact switch; 2. Sleeve; 23. Cylinder; 24. Second piston; 25. One-way intake valve; 26. Air guide pipe; 27. First one-way exhaust valve; 28. Third contact switch; 29. ​​Fourth contact switch; 30. Exhaust pipe; 31. Second one-way exhaust valve; 32. Spiral blade; 33. Retaining ring; 34. Rubber sealing ring; 35. Pressure cap; 36. Slide groove; 37. Slide plate; 38. First support rod; 39. Second support rod; 40. Top rod; 41. Connecting rod; 42. Guide groove. Detailed Implementation

[0018] To enable those skilled in the art to more clearly understand the technical solution of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0019] like Figures 1-8 As shown, this embodiment provides a rapid prototyping device for automotive polylactic acid composite materials, including a fixed base 3 fixed on a frame, an upper mold 4 installed at the bottom of the fixed base 3, a movable base 1 installed at the output end of a hydraulic cylinder, and a lower mold 2 fixed on the top of the movable base 1 and cooperating with the upper mold 4. Slide rods 5 are vertically installed in a circular array on the outer side of the top of the movable base 1, and the slide rods 5 are slidably connected to the fixed base 3. Water inlet connectors 6 are provided at the same end of both the lower mold 2 and the upper mold 4, and water inlet pipes 8 are installed at the ends of the water inlet connectors 6. Drainage connectors 7 are provided at the ends of both the lower mold 2 and the upper mold 4 away from the water inlet connectors 6, and drain pipes 9 are provided at the ends of the drain connectors 7. A first solenoid valve 10 is installed on the drain pipes 9. A hot water storage mechanism 11 for storing and releasing hot water is provided at one end of the top of the fixed base 3. A melt cooling mechanism 12 for cooling the molten material at the end of the barrel is provided at the top of the fixed base 3. An ejection mechanism 13 for removing the product is provided at the inner top of the lower mold 2.

[0020] By installing a hot water storage mechanism 11 consisting of a storage tank 14, a diversion pipe 15, a second solenoid valve 16, a first piston 17, a return spring 18, and a through hole 19 on the side of the fixed base 3, the high-temperature hot water generated during the initial cooling process can be stored inside the storage tank 14. After demolding, the hot water is used to preheat the mold, increasing the mold temperature and reducing the temperature difference between the mold and the polylactic acid composite material during injection. This effectively avoids the generation of air bubbles inside the finished product, eliminating the need for prolonged pressure holding during injection, thus improving the product molding rate. Simultaneously, it can utilize residual heat. This system utilizes a more energy-efficient design. It employs a melt cooling mechanism 12, consisting of a sleeve 22, a cylinder 23, a second piston 24, a one-way air inlet valve 25, an air guide pipe 26, a first one-way exhaust valve 27, an exhaust pipe 30, and a second one-way exhaust valve 31, mounted on the top of the fixed base 3. The injection molding machine barrel is located inside the sleeve 22. During mold opening, the upward movement of the slide rod 5 controls the sliding of the second piston 24 within the cylinder 23, injecting cold air from inside the cylinder 23 into the sleeve 22. This removes heat from the surface of the injection molding machine barrel, thereby cooling the molten material stored at the end of the barrel. This also avoids the formation of air bubbles inside the finished product, making it more practical. Furthermore, connecting the bottom of the exhaust pipe 30 to the water inlet connector 6 ensures the complete drainage of cooling water from inside the mold. Simultaneously, the hot air in the gas is used to preheat the mold again, improving the utilization rate of preheating. Through the control structure composed of the first contact switch 20 and the second contact switch 21 inside the storage tank 14, and the third contact switch 28 and the fourth contact switch 29 inside the cylinder 23, after mold closing, the third contact switch 28 controls the opening of the second solenoid valve 16, and the fourth contact switch 29 controls the closing of the first solenoid valve 10, thus reducing... When the temperature is reached, after the cooling water fills the storage tank 14, the first contact switch 20 opens the first solenoid valve 10, and the second contact switch 21 closes the second solenoid valve 16, so that the device can automatically control the circulation injection and discharge of hot water during use, making it more convenient to use. By setting the ejection mechanism 13, which consists of a slide groove 36, a slide plate 37, a first support rod 38, a second support rod 39, a push rod 40, a connecting rod 41, and a guide groove 42 between the two sides of the lower mold 2 and the upper mold 4, the ejection mechanism 13 can automatically control the upward movement of the push rod 40 after the mold is fully opened, so as to lift the finished product without the need for power control, thus speeding up the removal rate of the finished product.

[0021] In this embodiment, the hot water storage mechanism 11 includes a storage tank 14, a diversion pipe 15, and a second solenoid valve 16. The storage tank 14 is fixed on the fixed base 3. A diversion pipe 15 is provided between the bottom of the storage tank 14 and the drain connector 7. A second solenoid valve 16 is provided on the diversion pipe 15. A solution discharge mechanism is provided inside the storage tank 14. A control structure for controlling the opening and closing of the first solenoid valve 10 and the second solenoid valve 16 is provided inside the storage tank 14.

[0022] Local working principle: In the initial stage of cooling, the second solenoid valve 16 is in the open state while the first solenoid valve 10 is in the closed state. Therefore, the cooling water will not be discharged from the drain pipe 9, but will instead enter the storage tank 14 for storage. When the cooling is just started, the temperature of the mold itself is high, so the temperature of the cooling water is also relatively high. The storage tank 14 stores the warm water. After storing a certain amount, the first solenoid valve 10 opens and the second solenoid valve 16 closes, and the cooling water is automatically discharged from the drain pipe 9.

[0023] In this embodiment, the solution discharge mechanism includes a first piston 17, a return spring 18, and a through hole 19. The first piston 17 is slidably disposed at the inner bottom of the storage tank 14, and a return spring 18 is installed between the top of the first piston 17 and the inner top of the storage tank 14. A through hole 19 is provided at the middle position of the top of the storage tank 14.

[0024] Local working principle: When hot water enters the storage tank 14, it controls the first piston 17 to move upward and squeezes the return spring 18, which provides some resistance to the water entry and ensures the water heating effect. In addition, when hot water is discharged, the return spring 18 can drive the first piston 17 to move downward, which accelerates the injection of hot water.

[0025] In this embodiment, the melt cooling mechanism 12 includes a sleeve 22, a cylinder 23, a second piston 24, a one-way air inlet valve 25, an air guide pipe 26, a first one-way exhaust valve 27, an exhaust pipe 30, and a sealing mechanism. The sleeve 22 is fixed to the top of the fixed base 3. The sleeve 22 wraps around the outside of the injection molding machine barrel and leaves a gap between it and the outer wall of the barrel. The top of the sleeve 22 is provided with a sealing mechanism. Cylinders 23 are fixed at the four corners of the top of the fixed base 3. The second piston 24 is slidably installed inside each cylinder 23. The top of the slide rod 5 is fixedly connected to the bottom of the second piston 24. An air guide pipe 26 is provided between the top of the outer side of the cylinder 23 and the sleeve 22. A first one-way exhaust valve 27 is installed on the air guide pipe 26. A one-way air inlet valve 25 is provided at the top of the cylinder 23. An exhaust pipe 30 is installed at the bottom of the sleeve 22.

[0026] Local working principle: When the mold is closed, the movable seat 1 controls multiple sets of slide rods 5 to move upward. The slide rods 5 push the second piston 24 to move upward, injecting the gas inside the cylinder 23 into the inside of the insert 22 through the air guide pipe 26, taking away the heat inside the insert 22, and expelling the heat from the exhaust pipe 30.

[0027] In this embodiment, the bottom end of the exhaust pipe 30 is connected to the inside of the water inlet connector 6, and a second one-way exhaust valve 31 is installed on the exhaust pipe 30.

[0028] Local working principle: The hot air discharged from the exhaust pipe 30 enters the mold through the water inlet connector 6 to heat the mold, and the residual cooling water inside the mold is discharged from the drain pipe 9.

[0029] In this embodiment, a spiral blade 32 is installed at the bottom of the inner side of the insert 22, and the connection between the air guide pipe 26 and the insert 22 is located above the spiral blade 32. The inner side of the spiral blade 32 is in contact with the barrel of the injection molding machine.

[0030] Local working principle: After the gas enters the interior of the sleeve 22, the spiral blades 32 guide the flow, ensuring that the outer side of the barrel can be cooled evenly and ensuring the hot gas is discharged effectively.

[0031] In this embodiment, the sealing mechanism includes a fixing ring 33, a rubber sealing ring 34, and a pressure cap 35. The fixing ring 33 is fixed to the inner top of the insert 22. The pressure cap 35 is threaded onto the top of the insert 22. The rubber sealing ring 34 is installed between the bottom of the pressure cap 35 and the top of the fixing ring 33. The cross-sectional shape of the rubber sealing ring 34 is V-shaped.

[0032] Local working principle: After the barrel is inserted into the sleeve 22 from the pressure cap 35, the pressure cap 35 is rotated to squeeze the rubber sealing ring 34, so that the rubber sealing ring 34 is tightly attached to the outer wall of the barrel, ensuring the sealing effect inside the sleeve 22.

[0033] In this embodiment, the control structure includes a first contact switch 20, a second contact switch 21, a third contact switch 28, and a fourth contact switch 29. The first contact switch 20 is installed on one side inside the storage tank 14, the second contact switch 21 is installed on the other side inside the storage tank 14, the third contact switch 28 is installed on one side of the top inside the cylinder 23, and the fourth contact switch 29 is installed on the other side of the top inside the cylinder 23. The second contact switch 21 and the third contact switch 28 are electrically connected to the second solenoid valve 16 via wires, and the first contact switch 20 and the fourth contact switch 29 are both electrically connected to the first solenoid valve 10 via wires.

[0034] Local working principle: After the mold is closed, due to the compression of the second piston 24, the third contact switch 28 controls the second solenoid valve 16 to close, and the fourth contact switch 29 controls the second solenoid valve 16 to open. When cooling, after the cooling water fills the storage tank 14, due to the compression of the first piston 17, the first contact switch 20 opens the first solenoid valve 10, and the second contact switch 21 closes the second solenoid valve 16.

[0035] In this embodiment, the ejection mechanism 13 includes a slide 36, a slide plate 37, a first support rod 38, a second support rod 39, a push rod 40, a connecting rod 41, and a guide groove 42. The slide 36 is symmetrically opened on both sides of the lower mold 2. The slide plate 37 is vertically installed inside the slide 36. The first support rod 38 is hinged to the middle position of the outer side of the slide plate 37. The top of the first support rod 38 is hinged to the outer side of the upper mold 4. The push rod 40 is vertically slidably installed at the four corners of the top of the lower mold 2. The bottom end of the push rod 40 is fixedly installed between the slide plate 37 and the bottom end of the push rod 40. The guide groove 42 that cooperates with the connecting rod 41 is vertically opened inside the lower mold 2.

[0036] Local working principle: When the mold opens, the lower mold 2 and the upper mold 4 separate. After reaching the initial position, the second support rod 39, together with the first support rod 38, will pull the slide plate 37 upward. At this time, the slide plate 37, together with the connecting rod 41, will drive the ejector rod 40 to move upward, lifting the product upward so that the product can be quickly removed from the mold. When the mold closes, the connecting end of the second support rod 39 and the first support rod 38 extends outward and quickly pushes the ejector rod 40 outward to reset.

[0037] like Figures 1-8 As shown in the figure, this embodiment provides a method for using a rapid prototyping device for automotive polylactic acid composite materials, and the process is as follows: Step 1: During installation, connect the output end of the hydraulic cylinder vertically to the bottom of the movable seat 1, fix the fixed seat 3 on the frame, insert the injection molding machine barrel into the inside of the insert sleeve 22, align it with the pouring port at the top of the upper mold 4, and then rotate the pressure cap 35 to squeeze the rubber sealing ring 34 to seal the top of the insert sleeve 22 with the outside of the barrel. Step 2: When the mold is closed, the hydraulic cylinder controls the vertical movement of the slide rod 5 at the top of the movable seat 1. The slide rod 5 pushes the second piston 24 upward to slide, pushing the gas inside the cylinder 23 into the inside of the insert 22 to cool the end of the barrel, thereby cooling the molten material and expelling the hot air from the exhaust pipe 30. Since the exhaust pipe 30 is connected to the water inlet connector 6, the hot air removes the cooling water inside the lower mold 2 and the upper mold 4 and preheats the lower mold 2 and the upper mold 4. Step 3: After the mold is closed, the molten material is injected into the lower mold 2 and the upper mold 4. The temperature difference between the molten material and the lower mold 2 and the upper mold 4 is reduced, effectively preventing the generation of air bubbles. After the molten material is injected, the cooling water enters the lower mold 2 and the upper mold 4 through the water inlet pipe 8 and the water inlet connector 6 to cool down. The initial cooling water is heated to a higher temperature by the residual heat inside the lower mold 2 and the upper mold 4. At this time, the first solenoid valve 10 is closed and the second solenoid valve 16 is open. The hot water is stored in the storage tank 14. The reset spring 18 inside the storage tank 14 increases the resistance when the hot water enters, slows down the delivery rate of the cooling water, and ensures the heating effect of the initial cooling water. After storing a certain amount, the first piston 17 rises and squeezes the first contact switch 20 and the second contact switch 21, closing the second solenoid valve 16 and activating the first solenoid valve 10, completing the storage of hot water, and then discharging the subsequent cooling water from the drain pipe 9. Step 4: When the hot water stored in the storage tank 14 is closed again, and after the hot air preheats the interior of the lower mold 2 and the upper mold 4, the second piston 24 moves to the top of the cylinder 23. The second piston 24 squeezes the third contact switch 28 and the fourth contact switch 29 to open the second solenoid valve 16 and close the first solenoid valve 10, and flows into the interior of the lower mold 2 and the upper mold 4 for preheating again. Through double preheating, the temperature of the lower mold 2 and the upper mold 4 is increased. At the same time, the first piston 17 is reset under the force of the return spring 18. Step 5: When the mold is opened, the lower mold 2 and the upper mold 4 separate. After reaching the initial position, the second support rod 39, together with the first support rod 38, will pull the slide plate 37 upward. At this time, the slide plate 37, together with the connecting rod 41, will drive the ejector rod 40 to move upward, lifting the product upward so that the product can be demolded and taken out quickly.

[0038] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A rapid prototyping device for automotive polylactic acid composite materials, comprising a fixed base (3) fixed on a frame, an upper mold (4) installed at the bottom of the fixed base (3), a movable base (1) installed at the output end of a hydraulic cylinder, and a lower mold (2) fixed on the top of the movable base (1) and cooperating with the upper mold (4), characterized in that: The movable seat (1) has a sliding rod (5) vertically installed in a ring array on the outer side of the top. The sliding rod (5) is slidably connected to the fixed seat (3). The lower mold (2) and the upper mold (4) are provided with water inlet connectors (6) that are mutually connected. The end of the water inlet connector (6) is provided with a water inlet pipe (8). The lower mold (2) and the upper mold (4) are provided with drain connectors (7) that are mutually connected at the ends away from the water inlet connector (6). The end of the drain connector (7) is provided with a drain pipe (9). The drain pipe (9) is provided with a first solenoid valve (10). The top of the fixed seat (3) is provided with a hot water storage mechanism (11) for storing and releasing hot water. The top of the fixed seat (3) is provided with a melt cooling mechanism (12) for cooling the melt at the end of the barrel. The inner top of the lower mold (2) is provided with an ejection mechanism (13) for removing the product. The melt cooling mechanism (12) includes a sleeve (22), a cylinder (23), a second piston (24), a one-way air inlet valve (25), an air guide pipe (26), a first one-way exhaust valve (27), an exhaust pipe (30), and a sealing mechanism. The sleeve (22) is fixed to the top of the fixed base (3). The sleeve (22) wraps around the outside of the injection molding machine barrel and leaves a gap between it and the outer wall of the barrel. The top of the sleeve (22) is equipped with a sealing mechanism. The four corners of the top of the fixed base (3) are sealed. All are fixed with cylinders (23), and a second piston (24) is slidably installed inside each cylinder (23). The top of each slide rod (5) is fixedly connected to the bottom of the second piston (24). A guide pipe (26) is provided between the top of the outer side of the cylinder (23) and the insert (22). A first one-way exhaust valve (27) is installed on the guide pipe (26). A one-way intake valve (25) is provided on the top of the cylinder (23). An exhaust pipe (30) is installed at the bottom of the insert (22). A spiral blade (32) is installed at the bottom of the inner side of the insert (22). The connection between the air guide pipe (26) and the insert (22) is located above the spiral blade (32). The inner side of the spiral blade (32) is in contact with the barrel of the injection molding machine. The hot water storage mechanism (11) includes a storage tank (14), a diversion pipe (15), and a second solenoid valve (16). The storage tank (14) is fixed on a fixed base (3). A diversion pipe (15) is provided between the bottom of the storage tank (14) and the drain connector (7). A second solenoid valve (16) is provided on the diversion pipe (15). A solution discharge mechanism is provided inside the storage tank (14). A control structure for controlling the opening and closing of the first solenoid valve (10) and the second solenoid valve (16) is provided inside the storage tank (14). The bottom end of the exhaust pipe (30) is connected to the inside of the water inlet connector (6), and a second one-way exhaust valve (31) is installed on the exhaust pipe (30).

2. The rapid prototyping device for automotive polylactic acid composite materials according to claim 1, characterized in that: The solution discharge mechanism includes a first piston (17), a return spring (18), and a through hole (19). The first piston (17) is slidably disposed at the bottom of the storage tank (14). A return spring (18) is installed between the top of the first piston (17) and the top of the storage tank (14). A through hole (19) is provided at the middle position of the top of the storage tank (14).

3. The rapid prototyping device for automotive polylactic acid composite materials according to claim 2, characterized in that: The sealing mechanism includes a retaining ring (33), a rubber sealing ring (34), and a pressure cap (35). The retaining ring (33) is fixed to the inner top of the insert (22). The pressure cap (35) is threaded onto the top of the insert (22). A rubber sealing ring (34) is installed between the bottom of the pressure cap (35) and the top of the retaining ring (33). The cross-sectional shape of the rubber sealing ring (34) is V-shaped.

4. The rapid prototyping device for automotive polylactic acid composite materials according to claim 3, characterized in that: The control structure includes a first contact switch (20), a second contact switch (21), a third contact switch (28), and a fourth contact switch (29). The first contact switch (20) is installed on one side inside the storage tank (14), the second contact switch (21) is installed on the other side inside the storage tank (14), the third contact switch (28) is installed on one side of the top inside the cylinder (23), and the fourth contact switch (29) is installed on the other side of the top inside the cylinder (23). The second contact switch (21) and the third contact switch (28) are electrically connected to the second solenoid valve (16) through wires, and the first contact switch (20) and the fourth contact switch (29) are both electrically connected to the first solenoid valve (10) through wires.

5. The rapid prototyping device for automotive polylactic acid composite materials according to claim 4, characterized in that: The ejection mechanism (13) includes a slide (36), a slide plate (37), a first support rod (38), a second support rod (39), a push rod (40), a connecting rod (41), and a guide groove (42). The slide (36) is symmetrically opened on both sides of the lower mold (2). The slide plate (37) is vertically installed inside the slide (36). The first support rod (38) is hinged to the middle position of the outer side of the slide plate (37). The top of the first support rod (38) is hinged to the outer side of the upper mold (4). The push rod (40) is vertically slidably installed at the four corners of the top of the lower mold (2). The bottom end of the push rod (40) is fixedly installed between the slide plate (37) and the bottom end of the push rod (40). The guide groove (42) that cooperates with the connecting rod (41) is vertically opened inside the lower mold (2).

6. The method of using the rapid prototyping device for automotive polylactic acid composite materials according to claim 5, characterized in that, Includes the following steps: Step 1: During installation, connect the output end of the hydraulic cylinder vertically to the bottom of the movable seat (1), fix the fixed seat (3) on the frame, insert the injection molding machine barrel into the inside of the insert (22), align it with the pouring port at the top of the upper mold (4), and then rotate the pressure cap (35) to squeeze the rubber sealing ring (34) to seal the top of the insert (22) with the outside of the barrel; Step 2: When the mold is closed, the hydraulic cylinder controls the vertical movement of the slide rod (5) at the top of the movable seat (1). The slide rod (5) pushes the second piston (24) upward to slide, pushing the gas inside the cylinder (23) into the inside of the insert (22) to cool the end of the barrel, thereby cooling the molten material and expelling the hot air from the exhaust pipe (30). Since the exhaust pipe (30) is connected to the water inlet connector (6), the hot air removes the cooling water inside the lower mold (2) and the upper mold (4) and preheats the lower mold (2) and the upper mold (4). Step 3: After the mold is closed, the molten material is injected into the interior of the lower mold (2) and the upper mold (4). The temperature difference between the molten material and the lower mold (2) and the upper mold (4) is reduced, effectively preventing the generation of bubbles. After the molten material is injected, cooling water enters the interior of the lower mold (2) and the upper mold (4) through the water inlet pipe (8) and the water inlet connector (6) to cool down. The initial cooling water is heated to a higher temperature by the residual heat inside the lower mold (2) and the upper mold (4). At this time, the first solenoid valve (10) is in the closed state, while the second solenoid valve (16) is in the closed state. When the hot water is in the open state, the hot water is stored inside the storage tank (14). The setting of the reset spring (18) inside the storage tank (14) increases the resistance when the hot water enters, slows down the delivery rate of the cooling water, and ensures the heating effect of the initial cooling water. After storing a certain amount, the first piston (17) rises and squeezes the first contact switch (20) and the second contact switch (21), closing the second solenoid valve (16) and starting the first solenoid valve (10), completing the storage of hot water, and then discharging the subsequent cooling water from the drain pipe (9). Step 4: The hot water stored in the storage tank (14) will be used in the next mold closing. After the hot air preheats the interior of the lower mold (2) and the upper mold (4), the second piston (24) moves to the top of the cylinder (23). The second piston (24) squeezes the third contact switch (28) and the fourth contact switch (29) to open the second solenoid valve (16) and close the first solenoid valve (10). The hot water flows into the interior of the lower mold (2) and the upper mold (4) for reheating. Through double preheating, the temperature of the lower mold (2) and the upper mold (4) is increased. At the same time, the first piston (17) is reset under the force of the reset spring (18). Step 5: When the mold is opened, the lower mold (2) and the upper mold (4) are separated. After reaching the initial position, the second support rod (39) and the first support rod (38) will pull the slide plate (37) upward. At this time, the slide plate (37) and the connecting rod (41) will drive the ejector rod (40) to move upward, and lift the product upward so that the product can be demolded and taken out quickly.

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