Lightweight kettle type thermoplastic supercritical fluid circulation system

Abstract

The application discloses a kind of light weight kettle type thermoplastic supercritical fluid circulation systems, including supercritical fluid circulation structure, sealed cooling device and support frame, by being provided with supercritical fluid circulation structure and sealed cooling device, supercritical fluid is cooled and cooled to thermoplastic plastic in cooling chamber, after filter filtration and heat exchanger, the supercritical fluid in temporary storage tank is transported to fluid source storage tank for use by conveying pump, it is really used in circulation to realize supercritical fluid, by being provided with feed channel assembly and discharge channel assembly in the left and right sides of cooling chamber front end, there is feed conveyor belt assembly and discharge conveyor belt assembly in the front end of feed channel assembly and discharge channel assembly, it is placed on feed conveyor belt to need to be cooled thermoplastic plastic, automatically enter to cool in cooling chamber, automatically discharge and transport, increase the automation effect of equipment, to reduce the manual operation of user.

Description

Technical Field

[0001] This invention relates to the field of thermoplastic cooling technology, specifically a lightweight autoclave-type supercritical fluid circulation system for thermoplastics. Background Technology

[0002] Thermoplastics are a class of plastics that are malleable at certain temperatures, solidify upon cooling, and this process can be repeated. Their molecular structure is characterized by linear polymers, generally lacking active groups and not undergoing linear intermolecular cross-linking upon heating. Waste products can be recycled and reprocessed into new products. Major varieties include polyolefins (vinyl, olefin, styrene, acrylate, fluorinated olefins, etc.), cellulose, polyether polyesters, and aromatic heterocyclic polymers. To achieve lightweighting of autoclaves, thermoplastics are used in compression molding to produce lightweight autoclaves. After compression molding, thermoplastics require cooling and setting. Supercritical fluids possess the dual characteristics of liquids and gases, having a density close to that of liquids and a viscosity close to that of gases, as well as a high diffusion coefficient. Therefore, they exhibit excellent flow and transport properties, possessing the large cooling capacity of liquid coolants while maintaining the cooling uniformity of gases. This makes them ideal coolants for precision parts requiring high cooling uniformity.

[0003] Existing supercritical fluid circulation cooling equipment mainly focuses on the circulation of supercritical fluid and the conveying of cooled workpieces. For example, Chinese Patent No. CN202010690285.1, entitled "A Supercritical Fluid Circulation Cooling Method and Device," features a ring-shaped sealed cavity structure. This design eliminates the need for external discharge of the supercritical fluid, enabling its circulation within the sealed cavity. This maximizes the utilization rate of the supercritical fluid and reduces energy consumption. A conveyor belt is installed within the ring-shaped sealed cavity, allowing multiple workpieces to sequentially undergo supercritical fluid cooling as they move along the conveyor belt. However, it achieves good processing results and greatly improves production efficiency. An induced draft fan and heat exchanger are installed in the annular sealed cavity. The supercritical fluid forms a supercritical fluid circulation under the action of the induced draft fan, and the flow rate of the supercritical fluid can be adjusted by the induced draft fan. The heat exchanger transfers the heat from the workpiece to the supercritical fluid, maintaining the temperature stability of the supercritical fluid. Appropriate temperature, pressure and flow rate sensors are installed in the sealed cavity. The temperature, pressure and flow rate parameters of the supercritical fluid are measured and controlled in real time by a PID control system, and the cooling rate is controlled according to the ideal cooling curve to achieve the purpose of controllable cooling.

[0004] While the aforementioned supercritical fluid circulation cooling technology has certain advantages in supercritical fluid circulation and the transport of cooled workpieces, it still has some drawbacks:

[0005] 1. Supercritical fluid is circulated inside an annular sealed cavity. The temperature of the workpiece exchanges heat with the supercritical fluid, which rapidly cools the workpiece. However, this also causes the temperature of the supercritical fluid to rise rapidly. The supercritical fluid is cooled by heat exchange through a heat exchanger, but the heat exchange efficiency of the heat exchanger is not as high as the temperature rise of the supercritical fluid by the workpiece. This is not conducive to the circulation of the supercritical fluid in the sealed cavity, and it is easy to increase the temperature in the sealed cavity, thereby reducing the cooling efficiency and cooling effect of the workpiece. The circulation of the supercritical fluid is not achieved.

[0006] 2: A circular conveyor belt is used to transport materials. The feeding and discharging of materials are controlled by the feeding transfer chamber and the discharging transfer chamber at both ends of the circular conveyor belt. Two quick-opening doors are set on both sides of the feeding transfer chamber and the discharging transfer chamber for opening and closing control. However, when the workpiece enters between the two quick-opening doors, it is not convenient to automatically enter and transfer to the circular conveyor belt. The cooled workpiece needs to be manually fed and discharged, which increases the manual operation effect and reduces the automation effect of the equipment.

[0007] 3: The opening and closing of the feed transfer chamber and the discharge transfer chamber are controlled by quick-opening doors on both sides. Since the feed transfer chamber and the discharge transfer chamber need to be sealed with the sealed cavity to avoid leakage of supercritical fluid inside the sealed cavity, the sealing effect inside the sealed cavity cannot be guaranteed, which makes it easy for supercritical fluid to leak. Summary of the Invention

[0008] Therefore, in order to overcome the above-mentioned shortcomings, the present invention provides a lightweight autoclave-type supercritical fluid circulation system for thermoplastics.

[0009] This invention is implemented by constructing a lightweight, autoclaved thermoplastic supercritical fluid circulation system. The system includes a supercritical fluid circulation structure and a sealed cooling device. The sealed cooling device is connected to the supercritical fluid circulation structure at both ends, and a support frame is fixed to the bottom of the sealed cooling device. The supercritical fluid circulation structure includes a fluid source tank, a first check valve, a booster pump, a first shut-off valve, a second check valve, a transfer pump, a second shut-off valve, a temporary storage tank, a third check valve, a heat exchanger, a filter, and a third shut-off valve. The first check valve is connected to the right side of the top of the fluid source tank, and its right end is connected to the booster pump. The booster pump is connected to the first shut-off valve via a conduit on its right end. A second check valve is connected to the rear side of the top of the fluid source storage tank. The rear end of the second check valve is connected to one end of the delivery pump via a conduit, and the other end of the delivery pump is connected to the second shut-off valve via a conduit. The right end of the second shut-off valve is connected to the temporary storage tank. The front side of the top of the temporary storage tank is connected to a third check valve. The front end of the third check valve is connected to the rear side of the top of the heat exchanger via a conduit, and the front side of the top of the heat exchanger is connected to the filter via a conduit. The left end of the filter is connected to the third shut-off valve. The first shut-off valve and the third shut-off valve are respectively connected to the left and right ends of the sealed cooling device.

[0010] Preferably, the sealing and cooling device includes a sealing and cooling conveying chamber, a feeding conveyor belt assembly, a discharging conveyor belt assembly, a fixed support plate, a first electric push rod, and a first push plate. The left front end of the sealing and cooling conveying chamber is connected to the right rear end of the feeding conveyor belt assembly, and the right front end of the sealing and cooling conveying chamber is connected to the left rear end of the discharging conveyor belt assembly. A fixed support plate is fixed to the right front wall of the feeding conveyor belt assembly, and a first electric push rod is fixed to the front end of the fixed support plate. The movable rod at the rear end of the first electric push rod is fixedly connected to the first push plate. The left and right ends of the sealing and cooling conveying chamber are respectively connected to a first shut-off valve and a third shut-off valve. The bottom ends of the sealing and cooling conveying chamber, the feeding conveyor belt assembly, and the discharging conveyor belt assembly are all fixedly connected to a support frame.

[0011] Preferably, the sealed cooling conveying chamber includes a cooling chamber, an air inlet pipe, an air outlet pipe, a first motor, a first conveyor belt, a feeding channel assembly, a discharging channel assembly, a second electric push rod, and a second push plate. The left end of the cooling chamber is connected to the air inlet pipe, and the right end of the cooling chamber is connected to the air outlet pipe. The first motor is fixed to the bottom left side of the rear end of the cooling chamber. The bottom of the interior of the cooling chamber is provided with a first conveyor belt. The output shaft at the front end of the first motor is connected to the rotating roller on the left side inside the first output belt. The left and right sides of the front end of the cooling chamber are respectively connected to the feeding channel assembly and the discharging channel assembly. The right side of the rear end wall of the cooling chamber is fixed with a second electric push rod. The movable rod at the front end of the second electric push rod extends into the cooling chamber and is fixedly connected to the second push plate. The front end of the feeding channel assembly is connected to the feeding conveyor belt assembly, and the front end of the discharging channel assembly is connected to the discharging conveyor belt assembly. The bottom end of the cooling chamber is fixedly connected to the support frame. The left end of the air inlet pipe is connected to a first shut-off valve, and the right end of the air outlet pipe is connected to a third shut-off valve.

[0012] Preferably, the feeding channel assembly and the discharging channel assembly have the same structure. The feeding channel assembly includes a feeding channel shell, a bottom shell, a second motor, a second conveyor belt, a rear opening and closing sealing door, and a front opening and closing sealing door. The bottom shell is fixed to the bottom end of the feeding channel shell. The second motor is fixed to the rear left side of the bottom shell. The second conveyor belt is arranged on the right side inside the bottom shell, and the output shaft of the right end of the second motor is connected to the rotating roller on the rear side inside the second conveyor belt. The rear end of the feeding channel shell is equipped with a rear opening and closing sealing door, and the front end of the feeding channel shell is equipped with a front opening and closing sealing door. The rear end of the feeding channel shell is fixedly connected to the cooling chamber, and the connection between the cooling chamber and the feeding channel shell is through. The front ends of the feeding channel shells of the feeding channel assembly and the discharging channel assembly are fixedly connected to the feeding conveyor belt assembly and the discharging conveyor belt assembly, respectively.

[0013] Preferably, the rear opening and closing sealing door and the front opening and closing sealing door have the same structure and are symmetrically arranged. The rear opening and closing sealing door includes a movable door panel, a fixed rotating shaft, a fixed block, a first sealing ring, a protruding plate, a second sealing ring, a support plate, a third electric push rod, and a connecting rotating shaft. The top of the interior of the movable door panel rotates along the fixed rotating shaft, and the left and right ends of the fixed rotating shaft are respectively fixedly connected to the fixed block. The first sealing ring is bonded to the front and rear edges of the movable door panel. A protruding plate is fixed to the middle of the front end of the movable door panel. A second sealing ring is bonded to the edge of the front end face of the protruding plate. A support plate is fixed to the upper left corner of the front end of the protruding plate. The top of the rear side of the third electric push rod is rotatably connected to the support plate through the rotating shaft, and the left side of the bottom of the front end of the third electric push rod rotates along the connecting rotating shaft. The left end of the connecting rotating shaft is fixedly connected to the left side wall inside the material conveying channel shell. The fixed block is fixed to the left and right sides of the top of the rear end of the material conveying channel shell.

[0014] Preferably, the flow direction of the first check valve is from left to right, and the flow direction of the second check valve is from back to front.

[0015] Preferably, the rear sidewalls of the feeding conveyor belt assembly and the discharging conveyor belt assembly are provided with grooves at the connection points with the feeding channel assembly and the discharging channel assembly.

[0016] Preferably, the first electric push rod is arranged in a straight line with the feeding channel assembly, and the rear end of the first electric push rod is aligned with the feeding channel assembly. The second electric push rod is arranged in a straight line with the discharging channel assembly, and the rear end of the second electric push rod is aligned with the discharging channel assembly.

[0017] Preferably, support frames are provided on the front and rear sides of the inner wall of the material conveying channel shell, and the front side of the second sealing ring of the rear opening and closing sealing door and the rear side of the second sealing ring of the front opening and closing sealing door are respectively connected to the support frames on the front and rear sides of the inner wall of the material conveying channel shell.

[0018] Preferably, the third electric push rod of the rear opening and closing sealing door is inclined upward from front to back, and the third electric push rod is located on the left side of the second conveyor belt.

[0019] The present invention has the following advantages: It provides a lightweight, autoclaved thermoplastic supercritical fluid circulation system, which, compared to similar equipment, has the following improvements:

[0020] Advantage 1: The lightweight autoclave-type supercritical fluid circulation system for thermoplastics described in this invention, through the setting of a supercritical fluid circulation structure and a sealed cooling device, sequentially forms a closed supercritical fluid circulation pipeline consisting of a fluid source storage tank, a first one-way valve, a booster pump, a first shut-off valve, a cooling chamber of the sealed cooling device, a third shut-off valve, a filter, a heat exchanger, a third one-way valve, a temporary storage tank, a second shut-off valve, a transfer pump, and a second one-way valve. This allows the supercritical fluid to cool the thermoplastic in the cooling chamber, and after being filtered and cooled by the heat exchanger, it enters the temporary storage tank. The transfer pump then transports the supercritical fluid from the temporary storage tank to the fluid source storage tank for use. This truly realizes the recycling of supercritical fluid, reduces waste, and avoids the rapid heating of the supercritical fluid in the cooling chamber, which could lead to low cooling efficiency for the workpiece, thus ensuring the cooling efficiency of the workpiece in the cooling chamber.

[0021] Advantage 2: The lightweight autoclave-type supercritical fluid circulation system for thermoplastics described in this invention features a feeding channel assembly and a discharging channel assembly located on the left and right sides of the front end of the cooling chamber. A feeding conveyor belt assembly and a discharging conveyor belt assembly are connected to the front ends of these assemblies. The thermoplastic workpieces requiring cooling are transported to the front end of the feeding channel via the feeding conveyor belt. A first electric pusher pushes the thermoplastic workpiece at the right end of the feeding conveyor belt into the feeding channel assembly for feeding. A second electric pusher, located on the right side of the cooling chamber, pushes the cooled thermoplastic workpiece from the right end of the cooling chamber into the discharging channel assembly for discharge control. The rear and front opening / closing sealing doors on both sides of the feeding and discharging channel assemblies are controlled by a third electric pusher. This allows the thermoplastic workpieces to be placed on the feeding conveyor belt and automatically enter the cooling chamber for cooling, with automatic discharge and conveying, increasing the automation of the equipment and reducing manual operation by the user.

[0022] Advantage 3: The lightweight autoclave-type supercritical fluid circulation system for thermoplastics described in this invention features a rear-opening and front-opening sealing door and a front-opening and front-opening sealing door respectively located on the rear and front sides of the inlet and outlet channels. The movable door plates of the rear-opening and front-opening and front-opening and sealing doors are controlled to open and close by a third electric push rod. A first sealing ring and a second sealing ring are respectively provided at the edge of the movable door plate and the edge of the protruding plate, thereby increasing the sealing effect of the rear-opening and front-opening and sealing doors on the conveying channel shell and preventing leakage of supercritical fluid inside the cooling chamber. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the supercritical fluid circulation structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the sealed cooling device structure of the present invention;

[0026] Figure 4 This is the present invention. Figure 2 A magnified view of a portion of area A;

[0027] Figure 5 This is a schematic diagram of the sealed cooling conveying chamber structure of the present invention;

[0028] Figure 6 This is a top sectional view of the internal structure of the sealed cooling conveyor chamber of the present invention;

[0029] Figure 7 This is the present invention. Figure 6 A magnified view of a portion of area B;

[0030] Figure 8 This is a schematic diagram of the feed channel assembly structure of the present invention;

[0031] Figure 9 This is a top cross-sectional view of the internal structure of the feed channel assembly of the present invention;

[0032] Figure 10 This is a schematic diagram of the rear-opening and sealing door structure of the present invention;

[0033] Figure 11 This is a top sectional view of the rear-opening and sealing door structure of the present invention;

[0034] Figure 12 This is a schematic diagram of the support frame structure of the present invention.

[0035] The components include: supercritical fluid circulation structure-1, sealed cooling device-2, support frame-3, fluid source storage tank-11, first check valve-12, booster pump-13, first shut-off valve-14, second check valve-15, transfer pump-16, second shut-off valve-17, temporary storage tank-18, third check valve-19, heat exchanger-110, filter-111, third shut-off valve-112, sealed cooling conveyor chamber-21, feed conveyor belt assembly-22, discharge conveyor belt assembly-23, fixed support plate-24, first electric push rod-25, first push plate-26, cooling chamber-211, air inlet pipe-212, air outlet pipe-213, first motor-214, first conveyor belt-215, and feed channel assembly-21. 6. Discharge channel assembly - 217, Second electric push rod - 218, Second push plate - 219, Exhaust fan - 2111, Pressure sensor - 2112, Temperature sensor - 2113, Groove - 221, Conveying channel shell - 2161, Bottom shell - 2162, Second motor - 2163, Second conveyor belt - 2164, Rear opening and closing sealing door - 2165, Front opening and closing sealing door - 2166, Support frame - 21611, Movable door panel - 21651, Fixed rotating shaft - 21652, Fixed block - 21653, First sealing ring - 21654, Protruding plate - 21655, Second sealing ring - 21656, Support plate - 21657, Third electric push rod - 21658, Connecting rotating shaft - 21659. Detailed Implementation

[0036] The following will be combined with the appendix Figure 1-12 This invention will be described in detail, and the technical solutions in the embodiments of this invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] Example 1;

[0038] Please see Figure 1 The present invention provides a lightweight thermoplastic supercritical fluid circulation system, comprising a supercritical fluid circulation structure 1 and a sealed cooling device 2. The left and right ends of the sealed cooling device 2 are respectively connected to the supercritical fluid circulation structure 1, and a support frame 3 is fixed at the bottom of the sealed cooling device 2.

[0039] Please see Figure 2 This invention discloses a lightweight autoclave-type supercritical fluid circulation system for thermoplastic materials. The supercritical fluid circulation structure 1 includes a fluid source storage tank 11, a first check valve 12, a booster pump 13, a first shut-off valve 14, a second check valve 15, a transfer pump 16, a second shut-off valve 17, a temporary storage tank 18, a third check valve 19, a heat exchanger 110, a filter 111, and a third shut-off valve 112. The first check valve 12 is connected to the right side of the top of the fluid source storage tank 11. The right end of the first check valve 12 is connected to the booster pump 13. The right end of the booster pump 13 is connected to the first shut-off valve 14 via a conduit. The second check valve 15 is connected to the rear side of the top of the fluid source storage tank 11. The rear end of the second check valve 15 is connected to one end of the transfer pump 16 via a conduit. The other end of the delivery pump 16 is connected to the second shut-off valve 17 via a conduit. The right end of the second shut-off valve 17 is connected to the temporary storage tank 18. The front side of the top of the temporary storage tank 18 is connected to the third one-way valve 19. The front end of the third one-way valve 19 is connected to the rear side of the top of the heat exchanger 110 via a conduit. The front side of the top of the heat exchanger 110 is connected to the filter 111 via a conduit. The left end of the filter 111 is connected to the third shut-off valve 112. The first shut-off valve 14 and the third shut-off valve 112 are respectively connected to the left and right ends of the sealed cooling device 2. The flow direction of the first one-way valve 12 is from left to right, and the flow direction of the second one-way valve 15 is from back to front, thus restricting the flow direction of the supercritical fluid inside the fluid source storage tank 11.

[0040] Please see Figure 3-4The present invention discloses a lightweight autoclave-type supercritical fluid circulation system for thermoplastics. The sealed cooling device 2 includes a sealed cooling conveying chamber 21, a feeding conveyor belt assembly 22, a discharging conveyor belt assembly 23, a fixed support plate 24, a first electric push rod 25, and a first push plate 26. The left front end of the sealed cooling conveying chamber 21 is connected to the right rear end of the feeding conveyor belt assembly 22, and the right front end of the sealed cooling conveying chamber 21 is connected to the left rear end of the discharging conveyor belt assembly 23. A fixed support plate 24 is fixed to the right end of the front wall of the feeding conveyor belt assembly 22, and a first electric push rod 25 is fixed to the front end of the fixed support plate 24. The movable rod at the rear end of the first electric push rod 25 is connected to the first... The push plate 26 is fixedly connected. The left and right ends of the sealed cooling conveyor chamber 21 are respectively connected to the first stop valve 14 and the third stop valve 112. The bottom ends of the sealed cooling conveyor chamber 21, the feeding conveyor belt assembly 22 and the discharging conveyor belt assembly 23 are all fixedly connected to the support frame 3. The rear side walls of the feeding conveyor belt assembly 22 and the discharging conveyor belt assembly 23 are provided with grooves 221 at the connection between them and the feeding channel assembly 216 and the discharging channel assembly 217, so that lightweight thermoplastic plastics can be fed and discharged at the feeding channel assembly 216 and the discharging channel assembly 217 through the grooves 221 of the feeding conveyor belt assembly 22 and the discharging conveyor belt assembly 237.

[0041] Please see Figure 5-7The present invention discloses a lightweight autoclave-type supercritical fluid circulation system for thermoplastics. The sealed cooling and conveying chamber 21 includes a cooling chamber 211, an inlet pipe 212, an outlet pipe 213, a first motor 214, a first conveyor belt 215, a feed channel assembly 216, a discharge channel assembly 217, a second electric push rod 218, and a second push plate 219. The left end of the cooling chamber 211 is connected to the inlet pipe 212, the right end of the cooling chamber 211 is connected to the outlet pipe 213, and the rear end of the cooling chamber 211... A first motor 214 is fixed to the bottom left side. A first conveyor belt 215 is installed at the bottom of the cooling chamber 211. The output shaft of the first motor 214 is connected to the rotating roller on the left side inside the first conveyor belt 215. The left and right sides of the front end of the cooling chamber 211 are connected to the feeding channel assembly 216 and the discharging channel assembly 217, respectively. A second electric push rod 218 is fixed to the right side of the rear end wall of the cooling chamber 211. The movable rod at the front end of the second electric push rod 218 extends into the cooling chamber 211. The feed channel assembly 216 is fixedly connected to the second push plate 219. Its front end is connected to the feed conveyor assembly 22, and its front end is connected to the discharge conveyor assembly 23. The bottom end of the cooling chamber 211 is fixedly connected to the support frame 3. The left end of the air inlet pipe 212 is connected to the first shut-off valve 14, and the right end of the air outlet pipe 213 is connected to the third shut-off valve 112. The first electric push rod 25 is aligned with the feed channel assembly 216, and its rear end is connected to the feed... The material channel assembly 216 is aligned in a straight line, and the second electric push rod 218 is set in the same straight line as the discharge channel assembly 217. The rear end of the second electric push rod 218 is aligned in a straight line with the discharge channel assembly 217. The lightweight thermoplastic in the reactor is pushed backward into the material channel assembly 216 by the first push plate 26 behind the first electric push rod 25, and the lightweight thermoplastic in the reactor inside the cooling chamber 211 is pushed forward into the discharge channel assembly 217 by the second electric push rod 218.

[0042] Please see Figure 8-9The present invention discloses a lightweight autoclave-type supercritical fluid circulation system for thermoplastics. The feed channel assembly 216 and the discharge channel assembly 217 have identical structures. The feed channel assembly 216 includes a conveying channel shell 2161, a bottom shell 2162, a second motor 2163, a second conveyor belt 2164, a rear opening and closing sealing door 2165, and a front opening and closing sealing door 2166. The bottom shell 2162 is fixed to the bottom end of the conveying channel shell 2161, and the bottom shell 2162 is fixed to the rear left side. A second motor 2163 is fixedly installed. A second conveyor belt 2164 is installed on the right side inside the bottom shell 2162. The output shaft of the right end of the second motor 2163 is connected to the rotating roller on the rear side inside the second conveyor belt 2164. A rear opening and closing sealing door 2165 is installed at the rear end of the material conveying channel shell 2161, and a front opening and closing sealing door 2166 is installed at the front end of the material conveying channel shell 2161. The rear end of the material conveying channel shell 2161 is fixedly connected to the cooling chamber 211, and the connection between the cooling chamber 211 and the material conveying channel shell 2161 is through. The front ends of the material conveying channel shell 2161 of the feeding channel assembly 216 and the discharging channel assembly 217 are fixedly connected to the feeding conveyor belt assembly 22 and the discharging conveyor belt assembly 23, respectively. Support frames 21611 are respectively installed on the front and rear sides of the inner wall of the material conveying channel shell 2161. The front side of the second sealing ring 21656 of the rear opening and closing sealing door 2165 and the second sealing ring 21656 of the front opening and closing sealing door 2166 are also fixedly connected. The rear side is connected to the support frames 21611 on the front and rear sides of the inner wall of the material conveying channel shell 2161, so that the front side of the second sealing ring 21656 of the rear opening and closing sealing door 2165 and the rear side of the second sealing ring 21656 of the front opening and closing sealing door 2166 are respectively attached to the support frames 21611 on the front and rear sides of the inner wall of the material conveying channel shell 2161, thereby sealing the connection between the rear opening and closing sealing door 2165 and the front opening and closing sealing door 2166 and the material conveying channel shell 2161.

[0043] Please see Figure 10-12The present invention discloses a lightweight thermoplastic supercritical fluid circulation system. The rear opening / closing sealing door 2165 and the front opening / closing sealing door 2166 have identical structures and are symmetrically arranged. The rear opening / closing sealing door 2165 includes a movable door plate 21651, a fixed rotating shaft 21652, a fixing block 21653, a first sealing ring 21654, a protruding plate 21655, a second sealing ring 21656, and a support plate 2165. 7. The third electric push rod 21658 and the connecting shaft 21659 are connected. The top of the inside of the movable door panel 21651 rotates along the fixed shaft 21652, and the left and right ends of the fixed shaft 21652 are fixedly connected to the fixed blocks 21653 respectively. The first sealing ring 21654 is glued to the front and rear edges of the movable door panel 21651. A protruding plate 21655 is fixed to the middle of the front end of the movable door panel 21651. A second sealing ring 2165 is glued to the edge of the front face of the protruding plate 21655. 6. A support plate 21657 is fixed to the upper left corner of the front end of the protruding plate 21655. The top rear side of the third electric push rod 21658 is rotatably connected to the support plate 21657 via a rotating shaft. The bottom left side of the front end of the third electric push rod 21658 rotates along the connecting rotating shaft 21659. The left end of the connecting rotating shaft 21659 is fixedly connected to the left side wall inside the material conveying channel shell 2161. The fixing block 21653 is fixed to the left and right sides of the top rear end of the material conveying channel shell 2161. The rear opening and closing sealing door 2 The third electric push rod 21658 of 165 is inclined upward from front to back and is located on the left side of the second conveyor belt 2164. The third electric push rod 21658 extends to push out the movable door plate 21651. The top of the movable door plate 21651 rotates upward along the fixed rotating shaft 21652 to open the movable door plate 21651. The third electric push rod 21658 retracts to pull the movable door plate 21651 to retract and cover the material conveying channel shell 2161.

[0044] Example 2;

[0045] This invention discloses a lightweight, batch-type supercritical fluid circulation system for thermoplastics. A fluid source storage tank 11, a first one-way valve 12, a booster pump 13, a first shut-off valve 14, a cooling chamber 211, a third shut-off valve 112, a filter 111, a heat exchanger 110, a third one-way valve 19, a temporary storage tank 18, a second shut-off valve 17, a transfer pump 16, and a second one-way valve 15 sequentially form a closed supercritical fluid circulation pipeline. This allows the supercritical fluid to cool the thermoplastic in the cooling chamber 211, and after being filtered by the filter 110 and cooled by the heat exchanger 110, it enters the temporary storage tank 18. The transfer pump 16 then transports the supercritical fluid from the temporary storage tank 18 back to the fluid source storage tank 11. To reduce waste of supercritical fluid, an induced draft fan 2111 is installed on the left side inside the cooling chamber 211. The induced draft fan 2111 increases the flow effect of the supercritical fluid, blowing the supercritical fluid entering the cooling chamber 211 to the right, thereby increasing the cooling effect on thermoplastics. A pressure sensor 2112 and a temperature sensor 2113 are installed at the top of the cooling chamber 211. The pressure sensor 2112 and the temperature sensor 2113 detect the temperature and pressure inside the cooling chamber 211, so as to control the pressure and temperature parameters of the supercritical fluid according to the pressure and temperature inside the cooling chamber 211, and control the cooling rate according to the ideal cooling curve to achieve the purpose of controllable cooling.

[0046] This invention provides an improved lightweight autoclave-type supercritical fluid circulation system for thermoplastics, the working principle of which is as follows:

[0047] First, before use, install it in the required flat position, and then connect the power ports of the booster pump 13, the first shut-off valve 14, the conveying pump 16, the second shut-off valve 17, the third shut-off valve 112, the feeding conveyor belt assembly 22, the discharging conveyor belt assembly 23, the first electric push rod 25, the first motor 214, the second electric push rod 218, the induced draft fan 2111, the pressure sensor 2112, the temperature sensor 2113, the second motor 2163, and the third electric push rod 21658 to an external intelligent controller with a power supply. The external intelligent controller will then supply power and control them respectively.

[0048] Secondly, in use, the lightweight thermoplastic material to be cooled is first placed on the feed conveyor belt assembly 22. The feed conveyor belt assembly 22 transports the lightweight thermoplastic material to the right to the front of the feed channel assembly 216. At this time, by controlling the retraction of the third electric push rod 21658 of the rear opening and closing sealing door 2165 of the feed channel assembly 216, the movable door plate 21651 of the rear opening and closing sealing door 2165 rotates downward along the fixed rotating shaft 21652, so that the movable door plate 2165 and the protruding plate 21655 seal the rear side of the conveying channel shell 2161 of the feed channel assembly 216. The edges of the movable door plate 21651 and the protruding plate 21655 are respectively provided with a first sealing ring 21654 and a second sealing ring 21656, which increases the sealing between the movable door plate 21651 and the protruding plate 21655 and the conveying channel. The sealing effect at the connection of shell 2161 is achieved by controlling the opening of the front opening and closing sealing door 2166 of the feeding channel assembly 216, and by controlling the first electric push rod 25 to drive the first push plate 26 to move backward. The first push plate 26 pushes the lightweight thermoplastic plastic to be cooled into the second conveyor belt 2164 inside the feeding channel assembly 216. Then, the front opening and closing sealing door 2166 of the feeding channel assembly 216 seals the front side of the feeding channel assembly 216 and opens the rear opening and closing sealing door 2165 of the feeding channel assembly 216. By controlling the second motor 2163 to generate power, the output shaft drives the roller shaft of the second conveyor belt 2164 to rotate, so that the second conveyor belt 2164 rotates to transport the thermoplastic plastic workpiece at the top to the first conveyor belt 215 inside the cooling chamber 211.

[0049] Third, when cooling the thermoplastic workpiece in the autoclave, the first shut-off valve 14 is opened. The supercritical fluid source in the fluid source tank 11 is pressurized by the booster pump 53 and then enters the cooling chamber 211 through the first shut-off valve 14. The induced draft fan 2111 blows the supercritical fluid into the cooling chamber 211 to the right, increasing the cooling effect on the thermoplastic. A pressure sensor 2112 and a temperature sensor 2113 are installed at the top of the cooling chamber 211. The pressure sensor 2112 and the temperature sensor 2113 detect the temperature and pressure inside the cooling chamber 211, so as to control the pressure and temperature parameters of the supercritical fluid according to the pressure and temperature inside the cooling chamber 211, control the cooling rate according to the ideal cooling curve, and achieve the purpose of controllable cooling. At the same time, the first motor 214 is controlled to generate power to pass through the cooling chamber 211. The output shaft drives the rotating roller of the first conveyor belt 215 to rotate, causing the first conveyor belt 215 to rotate and transport the thermoplastic workpiece at the top of the kettle to the right. The third shut-off valve 112 is opened, allowing the supercritical fluid at the right end of the cooling chamber 211 to be discharged through the third shut-off valve 112. After being filtered by the filter 110 and cooled by the heat exchanger 110, the discharged supercritical fluid enters the temporary storage tank 18 through the third one-way valve 19. By opening the second shut-off valve 17, the transfer pump 16 is controlled to transport the supercritical fluid in the temporary storage tank 18 to the fluid source storage tank 11 for use. This truly realizes the recycling of supercritical fluid, reduces the waste of supercritical fluid, avoids the rapid heating of supercritical fluid in the cooling chamber 211, which leads to low cooling efficiency of the workpiece, and ensures the cooling efficiency of the workpiece in the cooling chamber 211.

[0050] Fourth, when removing the cooled thermoplastic from the cooling chamber 211, the front opening and closing sealing door 2166 of the discharge channel assembly 217 is closed, and then the rear opening and closing sealing door 2165 of the discharge channel assembly 217 is opened. The second electric push rod 218 is controlled to move the second push plate 219 forward, pushing the cooled thermoplastic workpiece forward onto the second conveyor belt 2164 inside the discharge channel assembly 217 via the second push plate 219. Then, the rear opening and closing sealing door 2165 is closed, and the front opening and closing sealing door 2166 is opened. The second motor 2163 of the control discharge channel assembly 217 drives the internal second conveyor belt 2164 to rotate. The rotation of the second conveyor belt 2164 conveys the cooled thermoplastic in the kettle forward to the discharge conveyor belt assembly 23. The discharge conveyor belt assembly 23 conveys the cooled thermoplastic in the kettle to discharge. The thermoplastic that needs to be cooled is placed on the feed conveyor belt 22 and can automatically enter the cooling chamber 211 for cooling. The automatic discharge and conveying increase the automation effect of the equipment and reduce manual operation by the user.

[0051] This invention provides a lightweight, batch-type supercritical fluid circulation system for thermoplastics. The system comprises a supercritical fluid circulation structure 1 and a sealed cooling device 2. A fluid source storage tank 11, a first one-way valve 12, a booster pump 13, a first shut-off valve 14, a cooling chamber 211 of the sealed cooling device 2, a third shut-off valve 112, a filter 111, a heat exchanger 110, a third one-way valve 19, a temporary storage tank 18, a second shut-off valve 17, a transfer pump 16, and a second one-way valve 15 sequentially form a closed supercritical fluid circulation pipeline. This allows the supercritical fluid to cool the thermoplastic in the cooling chamber 211, followed by filtration through the filter 110 and heat exchange. After heat exchange and cooling in the heat exchanger 110, the supercritical fluid enters the temporary storage tank 18. The supercritical fluid in the temporary storage tank 18 is then transported to the fluid source storage tank 11 for use via the transfer pump 16. This truly realizes the recycling of supercritical fluid, reducing waste and preventing the rapid heating of the supercritical fluid within the cooling chamber 211, which would otherwise result in low cooling efficiency for the workpiece. This ensures efficient cooling of the workpiece within the cooling chamber 211. A feed channel assembly 216 and a discharge channel assembly 217 are respectively installed on the left and right sides of the front end of the cooling chamber 211. A feed conveyor belt assembly 22 and a discharge conveyor belt assembly 23 are connected to the front ends of the feed channel assembly 216 and discharge channel assembly 217, respectively. The feed conveyor belt 22 transports the fluid to be cooled... Thermoplastic workpieces are conveyed to the front end of the feeding channel 217, and the thermoplastic at the right end of the feeding conveyor belt 217 is pushed into the feeding channel assembly 216 by the first electric push rod 25 for feeding. A second electric push rod 218 is installed on the right side inside the cooling chamber 211, and the cooled thermoplastic at the right end of the cooling chamber 211 is pushed out into the discharge channel assembly 217 for discharge control. The rear opening and closing sealing doors 2165 and front opening and closing sealing doors 2166 on both the front and rear sides of the feeding channel assembly 216 and the discharge channel assembly 217 are controlled by a third electric push rod 21658 for opening and closing, allowing the thermoplastic to be cooled to be placed on the feeding conveyor belt 22 and automatically enter the cooling channel. Cooling is performed within the cooling chamber 211, and automatic material discharge and conveying are also implemented, increasing the automation effect of the equipment and reducing manual operation by the user. A rear-opening sealing door 2165 and a front-opening sealing door 2166 are respectively installed on the rear and front sides of the feeding channel assembly 216 and the discharging channel assembly 217. The movable door plates 21651 of the rear-opening sealing door 2165 and the front-opening sealing door 2166 are controlled to open and close via a third electric push rod 21658. A first sealing ring 21654 and a second sealing ring 21656 are respectively installed at the edge of the movable door plate 21651 and the edge of the protruding plate 21655, increasing the sealing effect of the rear-opening sealing door 2165 and the front-opening sealing door 2166 on the conveying channel shell 2161.To prevent leakage of supercritical fluid inside cooling chamber 211.

[0052] The above description shows and illustrates the basic principles, main features, and advantages of the present invention. Standard parts used in the present invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lightweight autoclave-type supercritical fluid circulation system for thermoplastics, characterized in that: The system includes a supercritical fluid circulation structure (1) and a sealed cooling device (2). The left and right ends of the sealed cooling device (2) are connected to the supercritical fluid circulation structure (1), and a support frame (3) is fixed at the bottom of the sealed cooling device (2). The supercritical fluid circulation structure (1) includes a fluid source storage tank (11), a first check valve (12), a booster pump (13), a first shut-off valve (14), a second check valve (15), a transfer pump (16), a second shut-off valve (17), a temporary storage tank (18), a third check valve (19), a heat exchanger (110), a filter (111), and a third shut-off valve (112). The right side of the top of the fluid source storage tank (11) is connected to the first check valve (12). The right end of the first check valve (12) is connected to the booster pump (13). The right end of the booster pump (13) is connected to the first check valve (14) through a conduit. The fluid source storage tank (11) is connected to the shut-off valve (14). The rear end of the top of the fluid source storage tank (11) is connected to the second check valve (15). The rear end of the second check valve (15) is connected to one end of the delivery pump (16) through a conduit. The other end of the delivery pump (16) is connected to the second shut-off valve (17) through a conduit. The right end of the second shut-off valve (17) is connected to the temporary storage tank (18). The front end of the top of the temporary storage tank (18) is connected to the third check valve (19). The front end of the third check valve (19) is connected to the rear end of the top of the heat exchanger (110) through a conduit. The front end of the top of the heat exchanger (110) is connected to the filter (111) through a conduit. The left end of the filter (111) is connected to the third shut-off valve (112). The first shut-off valve (14) and the third shut-off valve (112) are respectively connected to the left and right ends of the sealed cooling device (2). The sealed cooling device (2) includes a sealed cooling conveyor chamber (21), a feeding conveyor belt assembly (22), a discharging conveyor belt assembly (23), a fixed support plate (24), a first electric push rod (25), and a first push plate (26). The front left side of the sealed cooling conveyor chamber (21) is connected to the rear right side of the feeding conveyor belt assembly (22), and the front right side of the sealed cooling conveyor chamber (21) is connected to the rear left side of the discharging conveyor belt assembly (23). A fixed support plate (24) is fixed to the right side of the front wall of the feeding conveyor belt assembly (22), and a first electric push rod (25) is fixed to the front end of the fixed support plate (24). The movable rod at the rear end of the first electric push rod (25) is fixedly connected to the first push plate (26). The sealed cooling conveying chamber (21) includes a cooling chamber (211), an air inlet pipe (212), an air outlet pipe (213), a first motor (214), a first conveyor belt (215), a feeding channel assembly (216), a discharging channel assembly (217), a second electric push rod (218), and a second push plate (219). The front left and right sides of the cooling chamber (211) are respectively connected to the feeding channel assembly (216) and the discharging channel assembly (217). The right side of the rear wall of the cooling chamber (211) is fixed with a second electric push rod (218). The movable rod at the front end of the second electric push rod (218) extends into the cooling chamber (211) and is fixedly connected to the second push plate (219). The front end of the feeding channel assembly (216) is connected to the feeding conveyor assembly (22), and the front end of the discharging channel assembly (217) is connected to the discharging conveyor assembly (23). The feeding channel assembly (216) and the discharging channel assembly (217) have the same structure. The feeding channel assembly (216) includes a conveying channel shell (2161), a bottom shell (2162), a second motor (2163), a second conveyor belt (2164), a rear opening and closing sealing door (2165), and a front opening and closing sealing door (2166). The bottom shell (2162) is fixed to the bottom end of the conveying channel shell (2161). A second motor (2163) is fixed to the rear side of the left end. A second conveyor belt (2164) is provided on the right side inside the bottom shell (2162). The output shaft of the right end of the second motor (2163) is connected to the rotating roller on the rear side inside the second conveyor belt (2164). A rear opening and closing sealing door (2165) is installed at the rear end of the material conveying channel shell (2161), and a front opening and closing sealing door (2166) is installed at the front end of the material conveying channel shell (2161).

2. The lightweight autoclave-type supercritical fluid circulation system for thermoplastics according to claim 1, characterized in that: The sealed cooling conveying chamber (21) is connected to the first shut-off valve (14) and the third shut-off valve (112) at its left and right ends respectively. The bottom ends of the sealed cooling conveying chamber (21), the feeding conveyor belt assembly (22) and the discharging conveyor belt assembly (23) are all fixedly connected to the support frame (3).

3. The lightweight autoclave-type thermoplastic supercritical fluid circulation system according to claim 2, characterized in that: The left end of the cooling chamber (211) is connected to an air inlet pipe (212), the right end of the cooling chamber (211) is connected to an air outlet pipe (213), a first motor (214) is fixed at the bottom left of the rear end of the cooling chamber (211), a first conveyor belt (215) is provided at the bottom inside the cooling chamber (211), the output shaft at the front end of the first motor (214) is connected to the rotating roller on the left side inside the first conveyor belt (215), the bottom end of the cooling chamber (211) is fixedly connected to the support frame (3), the left end of the air inlet pipe (212) is connected to the first shut-off valve (14), and the right end of the air outlet pipe (213) is connected to the third shut-off valve (112).

4. The lightweight autoclave-type supercritical fluid circulation system for thermoplastics according to claim 3, characterized in that: The rear end of the material conveying channel shell (2161) is fixedly connected to the cooling chamber (211), and the connection between the cooling chamber (211) and the material conveying channel shell (2161) is through. The front end of the material conveying channel shell (2161) of the feeding channel assembly (216) and the discharging channel assembly (217) is fixedly connected to the feeding conveyor belt assembly (22) and the discharging conveyor belt assembly (23), respectively.

5. The lightweight autoclave-type supercritical fluid circulation system for thermoplastics according to claim 4, characterized in that: The rear opening and closing sealing door (2165) and the front opening and closing sealing door (2166) have the same structure and are symmetrically arranged. The rear opening and closing sealing door (2165) includes a movable door panel (21651), a fixed rotating shaft (21652), a fixing block (21653), a first sealing ring (21654), a protruding plate (21655), a second sealing ring (21656), a support plate (21657), a third electric push rod (21658), and a connecting rotating shaft (21659). The top of the interior of the movable door panel (21651) rotates along the fixed rotating shaft (21652), and the left and right ends of the fixed rotating shaft (21652) are fixedly connected to the fixing block (21653) respectively. 51) A first sealing ring (21654) is bonded to the front and rear edges. A protruding plate (21655) is fixed to the middle of the front end of the movable door panel (21651). A second sealing ring (21656) is bonded to the edge of the front end face of the protruding plate (21655). A support plate (21657) is fixed to the upper left corner of the front end of the protruding plate (21655). The top of the rear side of the third electric push rod (21658) is rotatably connected to the support plate (21657) through a rotating shaft. The bottom left side of the front end of the third electric push rod (21658) rotates along the connecting rotating shaft (21659). The left end of the connecting rotating shaft (21659) is fixedly connected to the left side wall inside the material conveying channel shell (2161). The fixing block (21653) is fixed to the top left and right sides of the rear end of the material conveying channel shell (2161).

6. The lightweight autoclave-type supercritical fluid circulation system for thermoplastics according to claim 1, characterized in that: The flow direction of the first check valve (12) is from left to right, and the flow direction of the second check valve (15) is from back to front.

7. The lightweight autoclave-type supercritical fluid circulation system for thermoplastics according to claim 2, characterized in that: The rear sidewalls of the feed conveyor belt assembly (22) and the discharge conveyor belt assembly (23) are provided with grooves (221) at the connection points with the feed channel assembly (216) and the discharge channel assembly (217).

8. The lightweight autoclave-type supercritical fluid circulation system for thermoplastics according to claim 2, characterized in that: The first electric push rod (25) is arranged in the same straight line as the feeding channel assembly (216), and the rear end of the first electric push rod (25) is aligned with the feeding channel assembly (216). The second electric push rod (218) is arranged in the same straight line as the discharge channel assembly (217), and the rear end of the second electric push rod (218) is aligned with the discharge channel assembly (217).

9. The lightweight autoclave-type supercritical fluid circulation system for thermoplastics according to claim 4, characterized in that: Support frames (21611) are respectively provided on the front and rear sides of the inner wall of the material conveying channel shell (2161), and the front side of the second sealing ring (21656) of the rear opening and closing sealing door (2165) and the rear side of the second sealing ring (21656) of the front opening and closing sealing door (2166) are respectively connected to the support frames (21611) on the front and rear sides of the inner wall of the material conveying channel shell (2161).

10. A lightweight autoclave-type supercritical fluid circulation system for thermoplastics according to claim 4, characterized in that: The third electric push rod (21658) of the rear opening and closing sealing door (2165) is inclined upward from front to back, and the third electric push rod (21658) is located on the left side of the second conveyor belt (2164).

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