PCL supercritical foaming device and foaming method

Abstract

The invention discloses a PCL supercritical foaming device and a foaming method, and relates to the technical field of PCL foaming equipment.The PCL supercritical foaming device comprises a reaction kettle, a feeding pipe used for adding raw materials is installed on the reaction kettle, a bottom plate is arranged at the bottom of the reaction kettle, a vacuum pump is installed on one side of the top of the reaction kettle, and an air pipe is installed at the input end of the vacuum pump; a pressure release valve is mounted on the side wall of the reaction kettle, and a discharging mechanism and a liquid injection mechanism are arranged on the reaction kettle; the discharging mechanism comprises a first mounting groove, a movable plate and a mounting hinge, the first mounting groove is formed in the position, close to the lower portion, of the side wall of the reaction kettle, the movable plate is movably mounted in the first mounting groove, the mounting hinge is movably mounted between the movable plate and the reaction kettle, and the movable plate is movably mounted on the reaction kettle through the mounting hinge; and the movable plate can turn over by taking the mounting hinge as a base point. According to the reaction kettle, materials can smoothly fall off from the interior of the reaction kettle, and then the effect of rapid discharging is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of PCL foaming equipment, and in particular to a PCL supercritical foaming device and a foaming method. Background Art

[0002] A PCL supercritical foaming device is a special equipment that uses supercritical fluid to physically foam PCL under high pressure and high temperature conditions. This technology can prepare high-performance PCL foam materials with a controllable microporous structure without using chemical foaming agents.

[0003] When the existing PCL supercritical foaming device is in use, the PCL will adhere to the inner wall of the reaction device after foaming, making it difficult to discharge the material during the discharging cycle after foaming is completed. This leads to a more troublesome discharging process for the entire foamed material, requiring manual assistance for discharging, consuming a lot of time. In order to accelerate discharging, a demoulding liquid can be applied to the inner wall of the device, but manual application also consumes a large amount of time, further resulting in a low rate of the entire processing process and inconvenient use. Summary of the Invention

[0004] The purpose of the present invention is to provide a PCL supercritical foaming device and a foaming method to solve the problems raised in the above background art.

[0005] The technical solution of the present invention is: a PCL supercritical foaming device, including a reaction kettle, an inlet pipe for adding raw materials is installed on the reaction kettle, a bottom plate is arranged at the bottom of the reaction kettle, a vacuum pump is installed on one side of the top of the reaction kettle, an air pipe is installed at the input end of the vacuum pump, a pressure relief valve is installed on the side wall of the reaction kettle, and a discharging mechanism and a liquid injection mechanism are arranged on the reaction kettle; The discharging mechanism includes: A mounting groove one, a movable plate and a mounting hinge. The mounting groove one is opened at a position near the lower part of the side wall of the reaction kettle. The movable plate is movably installed inside the mounting groove one. The mounting hinge is movably installed between the movable plate and the reaction kettle. The movable plate is movably installed on the reaction kettle through the mounting hinge, and the movable plate can flip with the mounting hinge as the base point; A mounting groove two and a pressing block. The mounting groove two is annularly distributed and opened on the side wall of the reaction kettle. The mounting groove two is located directly above the mounting groove one. The pressing block is movably installed inside the mounting groove two; A piston tube, a piston rod and a piston block. The piston tube is made of iron and is fixedly installed on the side wall of the pressing block. The piston rod is fixedly installed on the side wall of the movable plate. One end of the piston rod penetrates the side wall of the piston tube and is located inside the piston tube. The piston block is located inside the piston tube and is fixedly installed on one end of the piston rod. A driving mechanism is arranged on the reaction kettle.

[0006] Preferably, the liquid injection mechanism includes a plurality of storage tanks, connecting hoses, one-way pressure valves, check valves, feed ports, and spraying ports I. The storage tanks are installed on the reaction kettle, and a connecting block is installed between the storage tanks and the reaction kettle. The connecting hose is a soft and extensible tubular structure, and is fixedly installed between the piston tube and the storage tank. The connecting hose communicates with the interiors of the storage tank and the piston tube. The one-way pressure valve is installed at one end of the piston tube close to the pressing block, the check valve is installed at the inner end of the connecting hose located in the storage tank, the feed port is opened on the side wall of the pressing block, and the feed port communicates with the interiors of the pressing block and the piston tube. The spraying ports I are obliquely opened downward on both side walls of the pressing block.

[0007] Preferably, the one-way pressure valve makes the interior between the piston tube and the pressing block a one-way channel. The piston tube can enter the interior of the pressing block, while the pressing block cannot enter the interior of the piston tube. The check valve makes the interior between the piston tube and the storage tank a one-way channel. The storage tank can enter the interior of the piston tube, while the piston tube cannot enter the interior of the storage tank.

[0008] Preferably, the driving mechanism includes a plurality of electric push rods, a driving ring, a movable block I, a transmission block I, a mounting block, a movable block II, and a mounting shaft. The plurality of electric push rods are all installed on the side wall of the reaction kettle. The driving ring is arranged at the position on the side wall of the reaction kettle corresponding to the movable plate. A mounting groove III is opened at the position on the driving ring corresponding to the electric push rod. The movable block I is movably installed in the mounting groove III, and the movable block I is fixedly connected to the output end of the electric push rod. The transmission block I is fixedly installed on the side wall of the movable plate, and the transmission block I is in mutual contact with the driving ring.

[0009] Preferably, the mounting block is fixedly installed on the side wall of the reaction kettle, the movable block II is fixedly installed on the electric push rod, the movable block II is located inside the mounting block, the mounting shaft is movably installed inside the mounting block, and the movable block II is movably sleeved on the mounting shaft.

[0010] Preferably, a sealing cover is movably installed on the feed pipe by means of threads. A blanking plate is fixedly installed below the side wall of the reaction kettle. A driving motor is installed on the blanking plate, and a rotating shaft is installed at the output end of the driving motor. The rotating shaft is fixedly connected to the bottom plate.

[0011] Preferably, the liquid injection mechanism further includes a mounting ring, a spraying head, a second spraying port, a fourth mounting groove, a second driving block, a driving magnet, and an electromagnetic block. The mounting ring is inlaid and installed on the inner wall of the reaction kettle. The spraying head is inlaid and movably installed on the side wall of the mounting ring. The spraying head is also internally communicated with the storage tank through a connecting hose. The second spraying port is opened below the side wall of the spraying head, and the second spraying port communicates with the inside of the spraying head. The fourth mounting groove is opened at the position of the inner wall of the reaction kettle corresponding to the mounting ring, and the fourth mounting groove extends into the first mounting groove and the mounting ring. The second driving block is a triangular block, and the second driving block is fixedly installed at the bottom of the spraying head. The driving magnet is movably installed at the middle position inside the fourth mounting groove. The electromagnetic block is inlaid and installed on the top of the movable plate. The poles of the driving magnet and the electromagnetic block close to each other are the same poles.

[0012] Preferably, a mounting rod is installed on the spraying head. The mounting rod penetrates the side walls of the mounting ring and the reaction kettle, and a first return spring is sleeved on the mounting rod.

[0013] Preferably, a return groove is opened on one side inside the fourth mounting groove. A return block is movably installed below the inside of the return groove. The return block is fixedly connected to the driving magnet. A second return spring is installed between the return block and the return groove.

[0014] The present invention also discloses a PCL supercritical foaming method, which is applied to the above-mentioned PCL supercritical foaming device, and includes the following steps: Step 1: Put the raw materials into the inside of the reaction kettle through the feed pipe, and then evacuate the inside of the reaction kettle through the vacuum pump and the air pipe. Subsequently, heat the reaction kettle so that the temperature of the raw materials reaches the foaming temperature. Then inject the supercritical N2 / CO2 mixed gas. After maintaining the pressure for a certain period of time, quickly release the pressure inside the reaction kettle through the pressure relief valve. Then the bottom plate can be removed from the bottom of the reaction kettle, and at this time, the materials can be discharged from the bottom of the reaction kettle. Step 2: When the raw materials are foaming inside the reaction kettle, the movable plate is located inside the first mounting groove and seals the first mounting groove, so that the raw materials can react normally inside the reaction kettle. When normal discharging is required after the raw materials are foamed, the driving mechanism can be used to drive the movable plate to turn upwards. Step 3: When the movable plate rotates, it can drive the piston rod, the piston tube, and the pressing block to rotate together. When the movable plate turns upwards, the pressing block will be driven to turn towards the inside of the reaction kettle. At this time, when the pressing block turns downwards, it will contact the top of the foamed material. Step 4: At the same time, when the movable plate rotates, the contact area between the formed material and the inner wall of the reaction kettle will become smaller. As the movable plate rotates, the pressing block will continue to press down on the material, so that the material can fall off from the inside of the reaction kettle smoothly.

[0015] The present invention provides a PCL supercritical foaming device and a foaming method by means of improvement. Compared with the prior art, the following improvements and advantages are achieved: First: Through the setting of the feeding mechanism of the present invention, when the raw material foams inside the reaction kettle, the movable plate is located inside the first mounting groove and seals the first mounting groove, enabling the raw material to react normally inside the reaction kettle. When normal feeding is required after the raw material has finished foaming, the driving mechanism can be used to drive the movable plate to flip upwards. A piston rod is installed on the movable plate. When the movable plate flips, it can drive the piston rod, the piston tube, and the pressing block to flip together. When the movable plate flips upwards, the pressing block will be driven to flip towards the inside of the reaction kettle. At this time, when the pressing block flips downwards, it will contact the top of the foamed material. At the same time, when the movable plate flips, the contact area between the formed material and the inner wall of the reaction kettle will become smaller. As the movable plate flips, the pressing block will continue to press down on the material, so that the material can smoothly fall off from the inside of the reaction kettle, thus achieving the effect of rapid feeding.

[0016] Second: Through the setting of the liquid injection mechanism of the present invention, the storage tank can be filled with the demoulding liquid. The demoulding liquid inside the storage tank can enter the inside of the piston tube through the connecting hose. When the movable plate flips to make the pressing block contact the material, due to the setting of the one-way pressure valve, when the material is extruded and fed through the pressing block, as the downward pressure increases, when the downward pressure is greater than the force of the one-way pressure valve, the one-way pressure valve will be opened. At this time, the piston block will move inside the piston tube, and then the demoulding liquid inside the piston tube will be extruded by the piston block and enter the inside of the pressing block through the feed port, and then can be sprayed out through the spraying ports one on both sides of the pressing block. Since the spraying port one is obliquely arranged, the demoulding liquid will be sprayed onto the other inner walls of the reaction kettle, and then flow downwards to contact the material, so that the material can be separated from the inner wall of the reaction kettle more quickly, and further accelerate the demoulding speed. After the material is separated, the driving mechanism is used to reset the movable plate. At this time, the piston block moves inside the piston tube of the reaction kettle, and a suction force can be generated inside the piston tube. Under the action of the suction force, the demoulding liquid inside the storage tank will be sucked into the inside of the piston tube, which is convenient for the next use.

[0017] Thirdly: Through the setting of the liquid injection mechanism in the present invention, after the movable plate resets, the electromagnet on the movable plate is powered on. At this time, the electromagnet will carry magnetic force. The pole of the transmission magnet close to the electromagnet is the same pole. Under the action of the repulsive force, the transmission magnet will move upward. After the transmission magnet moves upward, it will contact the inclined surface of the second transmission block, so that the second transmission block will be squeezed by the transmission magnet, and then the spraying head will move towards the inside of the reaction kettle. At this time, the demolding liquid inside the spraying head will flow out through the second spraying port, and then the demolding liquid will flow to the inner wall of the movable plate. When the movable plate flips next time, the movable plate can be easily separated from the material, achieving the effect of facilitating the separation of the movable plate from the material, and further improving the demolding speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 is the schematic diagram of the overall structure in the present invention; Figure 2 is the internal structure sectional view in the present invention; Figure 3 is the schematic diagram of the partial structure of the blanking mechanism in the present invention; Figure 4 is in the present invention Figure 2 enlarged view of part A; Figure 5 is in the present invention Figure 1 enlarged view of part B; Figure 6 is in the present invention Figure 1 enlarged view of part C; Figure 7 is in the present invention Figure 2 enlarged view of part D.

[0020] Reference numerals: 1. Reactor; 2. Feed pipe; 3. Bottom plate; 4. Vacuum pump; 5. Air pipe; 6. Sealing cover; 7. First installation groove; 8. Movable plate; 9. Installation hinge; 10. Second installation groove; 11. Pressing block; 12. Piston tube; 13. Piston rod; 14. Piston block; 15. Storage tank; 16. Connecting hose; 17. One-way pressure valve; 18. Check valve; 19. Feed port; 20. First spraying port; 21. Connecting block; 22. Pressure relief valve; 23. Electric push rod; 24. Driving ring; 25. Third installation groove; 26. First movable block; 27. First transmission block; 28. Installation block; 29. Second movable block; 30. Installation shaft; 31. Feeding plate; 32. Driving motor; 33. Rotating shaft; 34. Installation ring; 35. Spraying head; 36. Second spraying port; 37. Fourth installation groove; 38. Second transmission block; 39. Transmission magnetic block; 40. Electromagnetic block; 41. Installation rod; 42. First reset spring; 43. Reset groove; 44. Reset block; 45. Second reset spring. Specific implementation mode

[0021] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] The present invention provides a PCL supercritical foaming device and a foaming method by improvement. The technical solution of the present invention is as follows: Embodiment 1: As Figures 1 to 7 shown, this embodiment provides a PCL supercritical foaming device, including a reactor 1. A feed pipe 2 for adding raw materials is installed on the reactor 1. The feed pipe 2 is communicated with the inside of the reactor 1. A bottom plate 3 is arranged at the bottom of the reactor 1. The bottom plate 3 seals the bottom of the reactor 1. A vacuum pump 4 is installed on one side of the top of the reactor 1. An air pipe 5 is installed at the input end of the vacuum pump 4. The air pipe 5 is of a tubular structure. The bottom of the air pipe 5 is communicated with the inside of the reactor 1. A pressure relief valve 22 is installed on the side wall of the reactor 1. The raw materials are put into the inside of the reactor 1 through the feed pipe 2, and then the inside of the reactor 1 is evacuated through the vacuum pump 4 and the air pipe 5. Subsequently, the reactor 1 is heated to make the temperature of the raw materials reach the foaming temperature. Then, supercritical N2 / CO2 mixed gas is injected. After maintaining the pressure for a certain time, the inside of the reactor 1 is quickly depressurized through the pressure relief valve 22. Subsequently, the bottom plate 3 can be removed from the bottom of the reactor 1. At this time, feeding can be carried out from the bottom of the reactor 1. A feeding mechanism and a liquid injection mechanism are arranged on the reactor 1; The blanking mechanism includes multiple first mounting grooves 7, a movable plate 8, a mounting hinge 9, a second mounting groove 10, a pressing block 11, a piston tube 12, a piston rod 13, and a piston block 14. The first mounting groove 7 is a groove with a rectangular structure, and multiple first mounting grooves 7 are evenly distributed and opened at a position near the lower part of the side wall of the reaction kettle 1. The movable plate 8 is a rectangular plate adapted to the first mounting groove 7, and the movable plate 8 is movably installed inside the first mounting groove 7. The mounting hinge 9 is movably installed between the movable plate 8 and the reaction kettle 1. The movable plate 8 is movably installed on the reaction kettle 1 through the mounting hinge 9, and the movable plate 8 can be flipped with the mounting hinge 9 as a base point. The second mounting groove 10 is a groove with a rectangular structure, and multiple second mounting grooves 10 are annularly distributed and opened on the side wall of the reaction kettle 1. The second mounting groove 10 is located directly above the first mounting groove 7. The pressing block 11 is a hollow rectangular block adapted to the second mounting groove 10, and the pressing block 11 is movably installed inside the second mounting groove 10. The piston tube 12 is an arc-shaped tube, and the piston tube 12 is made of iron. The piston tube 12 is fixedly installed on the side wall of the pressing block 11. The piston rod 13 is an arc-shaped cylindrical rod, and the piston rod 13 is fixedly installed on the side wall of the movable plate 8. One end of the piston rod 13 penetrates the side wall of the piston tube 12 and is located inside the piston tube 12. The piston block 14 is located inside the piston tube 12, and the piston block 14 is fixedly installed on one end of the piston rod 13. A driving mechanism is provided on the reaction kettle 1, and the driving mechanism can cause the movable plate 8 to be flipped on the reaction kettle 1 with the mounting hinge 9 as a base point. Through the setting of the blanking mechanism, when the raw material foams inside the reaction kettle 1, the movable plate 8 is located inside the first mounting groove 7 and seals the first mounting groove 7, so that the raw material can be located inside the reaction kettle 1 for normal reaction. When normal blanking is required after the raw material has finished foaming, the driving mechanism can be used to drive the movable plate 8 to flip upward. The piston rod 13 is installed on the movable plate 8. When the movable plate 8 flips, it can drive the piston rod 13, the piston tube 12, and the pressing block 11 to flip together. When the movable plate 8 flips upward, the pressing block 11 will be driven to flip towards the inside of the reaction kettle 1. At this time, when the pressing block 11 flips downward, it will contact the top of the foamed material. At the same time, when the movable plate 8 flips, the contact area between the formed material and the inner wall of the reaction kettle 1 will become smaller. As the movable plate 8 flips, the pressing block 11 will continue to press downward on the material, so that the material can smoothly fall off from the inside of the reaction kettle 1, thereby achieving the effect of rapid blanking.

[0023] The liquid injection mechanism includes multiple storage tanks 15, connecting hoses 16, one-way pressure valves 17, check valves 18, feed inlets 19, and first material spraying ports 20. The storage tank 15 is of a hollow structure and is installed on the reaction kettle 1. A connecting block 21 is installed between the storage tank 15 and the reaction kettle 1. The connecting hose 16 is a tubular structure with a soft and stretchable material and is fixedly installed between the piston tube 12 and the storage tank 15. The connecting hose 16 communicates with the interiors of the storage tank 15 and the piston tube 12. The one-way pressure valve 17 is installed at one end of the piston tube 12 close to the pressing block 11. The check valve 18 is installed at the inner end of the connecting hose 16 located inside the storage tank 15. The feed inlet 19 is opened on the side wall of the pressing block 11, and the feed inlet 19 communicates with the interiors of the pressing block 11 and the piston tube 12. The first material spraying ports 20 are obliquely opened downward on both side walls of the pressing block 11. The one-way pressure valve 17 makes the interior between the piston tube 12 and the pressing block 11 a one-way channel. The piston tube 12 can enter the interior of the pressing block 11, while the pressing block 11 cannot enter the interior of the piston tube 12. The check valve 18 makes the interior between the piston tube 12 and the storage tank 15 a one-way channel. The storage tank 15 can enter the interior of the piston tube 12, while the piston tube 12 cannot enter the interior of the storage tank 15. Through the setting of the liquid injection mechanism, the storage tank 15 can be filled with the demoulding liquid. The demoulding liquid inside the storage tank 15 can enter the interior of the piston tube 12 through the connecting hose 16. When the movable plate 8 is flipped so that the pressing block 11 comes into contact with the material, due to the setting of the one-way pressure valve 17, when squeezing and feeding the material through the pressing block 11, as the downward pressure increases, when the downward pressure is greater than the force of the one-way pressure valve 17, the one-way pressure valve 17 will be opened, and then the demoulding liquid inside the piston tube 12 will be squeezed by the piston block 14 and enter the interior of the pressing block 11 through the feed inlet 19, and then can be sprayed out through the first material spraying ports 20 on both sides of the pressing block 11. Since the first material spraying ports 20 are obliquely opened, the demoulding liquid will be sprayed onto other inner walls of the reaction kettle 1, and then flow downward and come into contact with the material, so that the material can be separated from the inner wall of the reaction kettle 1 more quickly, and further accelerate the demoulding speed. After the material is separated, the movable plate 8 is reset by the driving mechanism. At this time, the piston block 14 moves inside the reaction kettle 1 of the piston tube 12, and a suction force can be generated inside the piston tube 12. Under the action of the suction force, the demoulding liquid inside the storage tank 15 will be sucked into the interior of the piston tube 12, which is convenient for the next use.

[0024] The driving mechanism includes a plurality of electric push rods 23, a driving ring 24, a first movable block 26, a first transmission block 27, a mounting block 28, a second movable block 29, and a mounting shaft 30. The plurality of electric push rods 23 are all mounted on the side wall of the reaction kettle 1. The driving ring 24 is of an annular structure and is arranged on the side wall of the reaction kettle 1 at a position corresponding to the movable plate 8. The third mounting groove 25 is a groove with a rectangular structure and is opened on the driving ring 24 at a position corresponding to the electric push rod 23. The first movable block 26 is a block with a rectangular structure and is movably mounted inside the third mounting groove 25. The first movable block 26 is fixedly connected to the output end of the electric push rod 23. The first transmission block 27 is a block with a rectangular structure and is fixedly mounted on the side wall of the movable plate 8. The first transmission block 27 is in mutual contact with the driving ring 24. The mounting block 28 is a hollow block and is fixedly mounted on the side wall of the reaction kettle 1. The second movable block 29 is fixedly mounted on the electric push rod 23. The second movable block 29 is located inside the mounting block 28. The mounting shaft 30 is of a cylindrical structure and is movably mounted inside the mounting block 28. The second movable block 29 is movably sleeved on the mounting shaft 30. The electric push rod 23 is movably mounted on the reaction kettle 1 through the mounting block 28, the second movable block 29, and the mounting shaft 30. When feeding is required, the electric push rod 23 is started. The electric push rod 23 drives the first movable block 26 to move upward. The first movable block 26 can then drive the driving ring 24 to move upward. When the driving ring 24 moves upward, it will squeeze the first transmission block 27. After being squeezed, the first transmission block 27 can drive the movable plate 8 to turn upward, thereby enabling the feeding operation.

[0025] A sealing cover 6 is movably mounted on the feed pipe 2 through threads. The sealing cover 6 can seal the feed pipe 2. A discharge plate 31 is fixedly mounted on the lower part of the side wall of the reaction kettle 1. A driving motor 32 is mounted on the discharge plate 31. A rotating shaft 33 is mounted on the output end of the driving motor 32. The rotating shaft 33 is fixedly connected to the bottom plate 3. When discharging is required, the driving motor 32 is started. The driving motor 32 drives the rotating shaft 33 to rotate. The rotating shaft 33 then drives the bottom plate 3 to move. At this time, the bottom plate 3 will be separated from the bottom of the reaction kettle 1, and discharging can be carried out at this time.

[0026] The liquid injection mechanism further includes a mounting ring 34, a material spraying head 35, a second material spraying port 36, a fourth mounting groove 37, a second transmission block 38, a transmission magnetic block 39 and an electromagnetic block 40. The mounting ring 34 is of a circular ring structure and is inlaid and mounted on the inner wall of the reaction kettle 1. The material spraying head 35 is a block with a hollow rectangular structure and is inlaid and movably mounted on the side wall of the mounting ring 34. The material spraying head 35 is also internally communicated with the storage tank 15 through a connecting hose 16. The second material spraying port 36 is a groove with a rectangular structure and is opened below the side wall of the material spraying head 35. The second material spraying port 36 communicates with the inside of the material spraying head 35. The fourth mounting groove 37 is a groove with a rectangular structure and is opened at the position of the inner wall of the reaction kettle 1 corresponding to the mounting ring 34. The fourth mounting groove 37 extends to the inside of the first mounting groove 7 and the mounting ring 34. The second transmission block 38 is a triangular block and is fixedly mounted at the bottom of the material spraying head 35. The transmission magnetic block 39 is a block with a rectangular structure and is movably mounted at the middle position inside the fourth mounting groove 37. The electromagnetic block 40 is inlaid and mounted on the top of the movable plate 8. The poles of the transmission magnetic block 39 and the electromagnetic block 40 that are close to each other are the same pole. Through the setting of the liquid injection mechanism, after the movable plate 8 is reset, the electromagnetic block 40 on the movable plate 8 is powered on. At this time, the electromagnetic block 40 will carry magnetic force, and the poles of the transmission magnetic block 39 and the electromagnetic block 40 that are close to each other are the same pole. Under the action of the repulsive force, the transmission magnetic block 39 will move upward. When the transmission magnetic block 39 moves upward, it will contact the inclined surface of the second transmission block 38, so that the second transmission block 38 will be squeezed by the transmission magnetic block 39, and then the material spraying head 35 will move towards the inside of the reaction kettle 1. At this time, the demolding liquid inside the material spraying head 35 will flow out through the second material spraying port 36, and then the demolding liquid will flow to the inner wall of the movable plate 8. When the movable plate 8 is turned over next time, the movable plate 8 can be easily separated from the material, achieving the effect of facilitating the separation of the movable plate 8 from the material, and further improving the demolding speed.

[0027] A mounting rod 41 is mounted on the material spraying head 35. The mounting rod 41 is of a cylindrical structure and penetrates through the side walls of the mounting ring 34 and the reaction kettle 1. A first reset spring 42 is sleeved on the mounting rod 41. When the material spraying head 35 moves, it will squeeze the first reset spring 42. When foaming, the electromagnetic block 40 can be powered off. At this time, the material spraying head 35 will be reset under the action of the first reset spring 42. A reset groove 43 is opened on one side inside the fourth mounting groove 37. The reset groove 43 is a groove with a rectangular structure. A reset block 44 is movably mounted below the inside of the reset groove 43. The reset block 44 is fixedly connected to the transmission magnetic block 39. A second reset spring 45 is mounted between the reset block 44 and the reset groove 43. When the transmission magnetic block 39 moves, it will squeeze the second reset spring 45. After the electromagnetic block 40 is powered off, the transmission magnetic block 39 will be reset under the action of the second reset spring 45.

[0028] Embodiment 2: This embodiment discloses a PCL supercritical foaming method, which is applied to the previous PCL supercritical foaming device, and includes the following steps: Step 1: Put the raw materials into the interior of the reaction kettle 1 through the feed pipe 2, then evacuate the interior of the reaction kettle 1 through the vacuum pump 4 and the air pipe 5, then heat the reaction kettle 1 to make the temperature of the raw materials reach the foaming temperature, then inject the supercritical N2 / CO2 mixed gas, after maintaining the pressure for a certain time, quickly release the pressure inside the reaction kettle 1 through the pressure relief valve 22, and then the bottom plate 3 can be removed from the bottom of the reaction kettle 1, and at this time, feeding can be carried out from the bottom of the reaction kettle 1; Step 2: When the raw materials are foaming inside the reaction kettle 1, the movable plate 8 is located inside the mounting groove 1 7 and seals the mounting groove 1 7, so that the raw materials can react normally inside the reaction kettle 1. When normal feeding is required after the raw materials are foamed, the movable plate 8 can be driven to turn upwards through the driving mechanism; Step 3: When the movable plate 8 rotates, it can drive the piston rod 13, the piston tube 12 and the pressing block 11 to rotate together. When the movable plate 8 turns upwards, the pressing block 11 will be driven to turn towards the interior of the reaction kettle 1. At this time, when the pressing block 11 turns downwards, it will contact the top of the foamed material; Step 4: At the same time, when the movable plate 8 rotates, the contact area between the formed material and the inner wall of the reaction kettle 1 will become smaller. As the movable plate 8 rotates, the pressing block 11 will continue to press down on the material, so that the material can fall off from the interior of the reaction kettle 1 smoothly.

[0029] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A PCL supercritical foaming device, comprising a reaction kettle (1), a feed pipe (2) for adding raw materials is installed on the reaction kettle (1), a bottom plate (3) is arranged at the bottom of the reaction kettle (1), and it is characterized in that: One side of the top of the reactor (1) is equipped with a vacuum pump (4). The input end of the vacuum pump (4) is equipped with an air pipe (5). A pressure relief valve (22) is installed on the side wall of the reactor (1). A blanking mechanism and a liquid injection mechanism are arranged on the reactor (1). The blanking mechanism includes: A mounting groove one (7), a movable plate (8) and a mounting hinge (9). The mounting groove one (7) is opened at a position near the lower part of the side wall of the reactor (1). The movable plate (8) is movably installed inside the mounting groove one (7). The mounting hinge (9) is movably installed between the movable plate (8) and the reactor (1). The movable plate (8) is movably installed on the reactor (1) through the mounting hinge (9). The movable plate (8) can be turned with the mounting hinge (9) as the base point. A mounting groove two (10) and a pressing block (11). The mounting groove two (10) is annularly distributed and opened on the side wall of the reactor (1). The mounting groove two (10) is located directly above the mounting groove one (7). The pressing block (11) is movably installed inside the mounting groove two (10). A piston tube (12), a piston rod (13) and a piston block (14). The piston tube (12) is made of iron. The piston tube (12) is fixedly installed on the side wall of the pressing block (11). The piston rod (13) is fixedly installed on the side wall of the movable plate (8). One end of the piston rod (13) penetrates the side wall of the piston tube (12) and is located inside the piston tube (12). The piston block (14) is located inside the piston tube (12). The piston block (14) is fixedly installed on one end of the piston rod (13). A driving mechanism is arranged on the reactor (1).

2. The PCL supercritical foaming device according to claim 1, wherein: The liquid injection mechanism includes a plurality of storage tanks (15), a connecting hose (16), a one-way pressure valve (17), a check valve (18), a feed inlet (19) and a spraying port one (20). The storage tanks (15) are installed on the reactor (1). A connecting block (21) is installed between the storage tanks (15) and the reactor (1). The connecting hose (16) is a tubular structure with a soft and extensible material. The connecting hose (16) is fixedly installed between the piston tube (12) and the storage tanks (15). The connecting hose (16) communicates the inside of the storage tanks (15) and the piston tube (12). The one-way pressure valve (17) is installed on one end of the piston tube (12) close to the pressing block (11). The check valve (18) is installed on one end of the connecting hose (16) located inside the storage tanks (15). The feed inlet (19) is opened on the side wall of the pressing block (11). The feed inlet (19) communicates the pressing block (11) and the inside of the piston tube (12). The spraying port one (20) is obliquely opened downward on both side walls of the pressing block (11).

3. The PCL supercritical foaming device according to claim 2, characterized in that: The one-way pressure valve (17) makes the inside of the piston tube (12) and the pressing block (11) a one-way channel. The piston tube (12) can enter the inside of the pressing block (11), while the pressing block (11) cannot enter the inside of the piston tube (12). The check valve (18) makes the inside of the piston tube (12) and the storage tanks (15) a one-way channel. The storage tanks (15) can enter the inside of the piston tube (12), while the piston tube (12) cannot enter the inside of the storage tanks (15).

4. A PCL supercritical foaming device according to claim 1, characterized in that: The driving mechanism includes a plurality of electric push rods (23), a driving ring (24), a first movable block (26), a first transmission block (27), a mounting block (28), a second movable block (29), and a mounting shaft (30). The plurality of electric push rods (23) are all installed on the side wall of the reaction kettle (1). The driving ring (24) is arranged at the position corresponding to the movable plate (8) on the side wall of the reaction kettle (1). A third mounting groove (25) is opened at the position on the driving ring (24) corresponding to the electric push rod (23). The first movable block (26) is movably installed inside the third mounting groove (25). The first movable block (26) is fixedly connected to the output end of the electric push rod (23). The first transmission block (27) is fixedly installed on the side wall of the movable plate (8). The first transmission block (27) and the driving ring (24) are in mutual contact.

5. The PCL supercritical foaming device according to claim 4, characterized in that: The mounting block (28) is fixedly installed on the side wall of the reaction kettle (1). The second movable block (29) is fixedly installed on the electric push rod (23). The second movable block (29) is located inside the mounting block (28). The mounting shaft (30) is movably installed inside the mounting block (28). The second movable block (29) is movably sleeved on the mounting shaft (30).

6. The supercritical foaming device for PCL according to claim 1, characterized in that: A sealing cover (6) is movably installed on the feed pipe (2) by means of threads. A blanking plate (31) is fixedly installed below the side wall of the reaction kettle (1). A driving motor (32) is installed on the blanking plate (31). A rotating shaft (33) is installed on the output end of the driving motor (32). The rotating shaft (33) is fixedly connected to the bottom plate (3).

7. The supercritical foaming device for PCL according to claim 1, characterized in that: The liquid injection mechanism further includes a mounting ring (34), a spraying head (35), a second spraying port (36), a fourth mounting groove (37), a second transmission block (38), a transmission magnetic block (39), and an electromagnetic block (40). The mounting ring (34) is inlaid and installed on the inner wall of the reaction kettle (1). The spraying head (35) is inlaid and movably installed on the side wall of the mounting ring (34). The spraying head (35) is also internally communicated with the storage tank (15) through a connecting hose (16). The second spraying port (36) is opened below the side wall of the spraying head (35). The second spraying port (36) communicates with the inside of the spraying head (35). The fourth mounting groove (37) is opened at the position on the inner wall of the reaction kettle (1) corresponding to the mounting ring (34). The fourth mounting groove (37) extends into the first mounting groove (7) and the inside of the mounting ring (34). The second transmission block (38) is a triangular block. The second transmission block (38) is fixedly installed at the bottom of the spraying head (35). The transmission magnetic block (39) is movably installed at the middle position inside the fourth mounting groove (37). The electromagnetic block (40) is inlaid and installed on the top of the movable plate (8). The poles of the transmission magnetic block (39) and the electromagnetic block (40) that are close to each other are of the same polarity.

8. A PCL supercritical foaming device according to claim 7, characterized in that: An installation rod (41) is installed on the spraying head (35). The installation rod (41) penetrates through the side walls of the mounting ring (34) and the reaction kettle (1). A first return spring (42) is sleeved on the installation rod (41).

9. The PCL supercritical foaming device according to claim 7, characterized in that: On one side inside the fourth installation groove (37), a reset groove (43) is formed. A reset block (44) is movably installed below the inside of the reset groove (43). The reset block (44) is fixedly connected to the transmission magnetic block (39). A second reset spring (45) is installed between the reset block (44) and the reset groove (43).

10. A PCL supercritical foaming method, which is applied to a PCL supercritical foaming device described in any one of claims 1-9, and is characterized in that: Including the following steps: Step 1: Put raw materials into the inside of the reaction kettle (1) through the feed pipe (2). Then, use the vacuum pump (4) and the air pipe (5) to evacuate the inside of the reaction kettle (1). Subsequently, heat the reaction kettle (1) to make the temperature of the raw materials reach the foaming temperature. Then, inject the supercritical N2 / CO2 mixed gas. After maintaining the pressure for a certain period of time, quickly release the pressure inside the reaction kettle (1) through the pressure relief valve (22). Then, the bottom plate (3) can be removed from the bottom of the reaction kettle (1). At this time, feeding can be carried out from the bottom of the reaction kettle (1). Step 2: When the raw materials foam inside the reaction kettle (1), the movable plate (8) is located inside the first installation groove (7) and seals the first installation groove (7), so that the raw materials can react normally inside the reaction kettle (1). When normal feeding is required after the raw materials are foamed, the driving mechanism can be used to drive the movable plate (8) to turn upwards. Step 3: When the movable plate (8) rotates, it can drive the piston rod (13), the piston tube (12), and the pressing block (11) to rotate together. When the movable plate (8) turns upwards, the pressing block (11) will be driven to turn towards the inside of the reaction kettle (1). At this time, when the pressing block (11) turns downwards, it will contact the top of the foamed material. Step 4: At the same time, when the movable plate (8) rotates, the contact area between the formed material and the inner wall of the reaction kettle (1) will become smaller. As the movable plate (8) rotates, the pressing block (11) will continue to press down on the material, so that the material can smoothly fall off from the inside of the reaction kettle (1).

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