Supercritical fluid assisted polymer mould pressing foaming device

Abstract

The utility model relates to a supercritical fluid assisted polymer mould pressing foaming device. Comprising a mold pressing mold provided with a mold cavity, a mold cooling system for supplying cooling water, a mold drainage system for rapidly discharging the cooling water, a supercritical fluid generation and supply system for injecting supercritical fluid into the mold cavity, and a mold pressure relief system for rapidly releasing high-pressure gas in the mold cavity, the electromagnetic induction coil is connected with high-frequency alternating current to realize heating; a mold cooling pipeline for containing cooling water is arranged in the mold pressing mold, the shape of the mold cooling pipeline corresponds to that of the electromagnetic induction coil, the electromagnetic induction coil is arranged in the mold cooling pipeline, and an annular gap is reserved between the electromagnetic induction coil and the inner wall of the mold cooling pipeline. The electromagnetic induction coil is directly arranged in the mold cooling pipeline, the local area of a mold cavity instead of the whole mold can be heated by selecting mold materials, the energy utilization rate is increased, and the device belongs to the technical field of polymer processing and forming devices.

Description

Technical Field

[0001] The invention relates to a polymer processing and forming device, in particular to a forming device which utilizes supercritical fluid to assist polymer in mold compression and foaming. Background Art

[0002] Polymer foam is a lightweight and porous composite material that is widely used in the fields of construction, packaging, transportation and consumer goods for its excellent thermal insulation, cushioning and sound absorption properties. In particular, when the diameter of the pores in the polymer foam is less than 100 microns, a polymer microporous foam is formed. This material significantly reduces the weight of the polymer product while maintaining the mechanical properties. Therefore, polymer microporous foam products can be used to replace solid polymer products to achieve the goal of saving materials, reducing energy consumption and costs.

[0003] At present, polymer microporous foam materials are mostly prepared by supercritical fluid (such as supercritical carbon dioxide, nitrogen, etc.) foaming technology, including extrusion foaming, injection molding foaming, kettle pressure foaming, compression foaming, etc. Different foaming technologies have their own characteristics, among which supercritical fluid-assisted polymer compression foaming technology has strong market demand due to its advantages of green environmental protection and controllable product quality.

[0004] In the process of supercritical fluid-assisted polymer compression foaming, how to quickly heat the foaming mold to the foaming temperature of the polymer material is crucial and directly related to the production efficiency of compression foaming. Chinese patent CN 203282653U discloses a supercritical fluid-assisted polymer compression foaming device, including a supercritical fluid delivery system, a mold system, a temperature measuring device, a pressure measuring device, a pressure release device, a display and control system, etc. Among them, the foaming mold is heated by the upper and lower hot plates of the molding machine. Chinese patent CN 208664228U discloses a supercritical fluid compression foaming device, including a temperature control device and a foaming mold, and the foaming mold is heated by installing a heating rod in the mold. In addition, Chinese patent CN216182148U discloses a supercritical compression foaming device, including a base, a top seat, a column arranged between the base and the top seat, an upper mold, and a lower mold; the upper mold and the lower mold are drilled with a heating pipeline, and the mold is heated by continuously passing heat transfer oil into the heating pipeline.

[0005] It can be seen that the currently commonly used supercritical fluid-assisted polymer compression foaming devices mainly heat the mold by setting a heating plate on the outer surface of the foaming mold or by embedding an electric heating rod in the base of the foaming mold or drilling a heating fluid delivery pipeline, etc. However, the above methods all heat the entire foaming mold, which has problems such as low heating efficiency and large heat loss, which in turn leads to a long compression foaming cycle, seriously affecting the production efficiency of compression foamed products. Summary of the invention

[0006] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a supercritical fluid-assisted polymer compression foaming device with higher heating and cooling efficiency.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A supercritical fluid-assisted polymer compression foaming device comprises a compression mold with a mold cavity, a mold cooling system for supplying cooling water, a mold drainage system for quickly discharging cooling water, a supercritical fluid generation and supply system for injecting supercritical fluid into the mold cavity, and a mold pressure relief system for quickly releasing high-pressure gas in the mold cavity; it also comprises an electromagnetic induction coil for electromagnetically heating the compression mold by passing high-frequency alternating current; a mold cooling pipe for accommodating cooling water is arranged in the compression mold, the shape of the mold cooling pipe corresponds to the shape of the electromagnetic induction coil, the electromagnetic induction coil is arranged in the mold cooling pipe, and an annular gap is left between the electromagnetic induction coil and the inner wall of the mold cooling pipe.

[0009] As a preferred embodiment, the mold cooling pipe is wavy, including multiple straight pipe sections arranged in parallel with each other and curved pipe sections connecting adjacent straight pipe sections; the electromagnetic induction coil is wavy, including multiple straight pipe sections arranged in parallel with each other and U-shaped sections connecting adjacent straight pipe sections. With this structure, the mold cooling pipe and the electromagnetic induction coil can be arranged more densely, thereby improving the cooling efficiency and heating efficiency.

[0010] As a preferred embodiment, the cross section of the mold cooling pipe is circular, rectangular, U-shaped or elliptical; the distance between the electromagnetic induction coil and the inner wall of the mold cooling pipe is 1 to 5 mm.

[0011] As a preferred embodiment, the number of mold cavities is one or more; in the projection in the depth direction of the mold cavities, the mold cooling pipe covers all the mold cavities; and at least one temperature sensor for monitoring the temperature of the mold cavities is provided in the molding die. After adopting this structure, in the actual production process, the number of mold cavities can be set to one or more (i.e., one mold with multiple cavities) according to the size and molding requirements of the molded foamed product.

[0012] As a preferred embodiment, the compression mold includes a cavity half mold and a core half mold; after the compression mold is closed, the front faces of the cavity half mold and the core half mold form a mold cavity; and a sealing gasket is provided on the parting surface of the cavity half mold and the core half mold. With this structure, the sealing gasket can effectively prevent the fluid in the high-pressure supercritical state in the mold cavity from leaking from the parting surface during the foaming process. Preferably, the material of the sealing gasket can be selected from high temperature and high pressure resistant fluororubber.

[0013] As a preferred embodiment, the cavity half mold includes a cavity mounting plate, a cavity retaining plate and a cavity plate which are sequentially connected by screws; the core half mold includes a core mounting plate, a core retaining plate and a core plate which are sequentially connected by screws; mold cooling pipes are provided between the cavity retaining plate and the cavity plate, and between the core retaining plate and the core plate; sealing rings are provided between the cavity retaining plate and the cavity plate, and between the core retaining plate and the core plate to prevent leakage of cooling water.

[0014] As a preferred embodiment, the cavity plate and the core plate are made of metal materials with high magnetic permeability; the cavity retaining plate and the core retaining plate are made of non-magnetic metal or non-metallic materials. With this structure, the electromagnetic induction coil can heat only the cavity plate and the core plate when high-frequency alternating current is passed, but not the cavity retaining plate and the core retaining plate, thereby greatly reducing heat loss and improving energy utilization.

[0015] As a preferred embodiment, several main pipelines for conveying supercritical fluid are provided in the cavity plate and the core plate, each main pipeline is connected to multiple branch pipelines, and a porous metal plug is provided at the end of the branch pipeline; the porous metal plug is installed in the installation hole on the surface of the mold cavity, and the end face of the porous metal plug is flush with the surface of the mold cavity; the supercritical fluid generation and supply system and the mold pressure relief system are both connected to the main pipeline. After adopting this structure, it is helpful to inject supercritical fluid into the mold cavity from multiple positions at the same time, so that the supercritical fluid can quickly diffuse and dissolve into the polymer material in the mold cavity to reach a saturated state, thereby effectively shortening the cycle of compression foaming.

[0016] As a preferred embodiment, the mold cooling system includes a cooling water tower, a booster pump, and a water inlet solenoid valve connected in sequence; the mold drainage system includes an air compressor, an air valve, and a one-way valve connected in sequence; the water inlet solenoid valve and the one-way valve are both connected to the mold cooling pipeline.

[0017] As a preferred embodiment, the supercritical fluid generation and supply system includes a gas storage tank, an air intake solenoid valve, a high-pressure metering pump, and a one-way solenoid valve connected in sequence; the mold pressure relief system includes an exhaust solenoid valve, a programmable pressure reducing valve, a muffler, and a pressure relief nozzle connected in sequence; the one-way solenoid valve and the exhaust solenoid valve are connected to the main pipeline for supercritical fluid transportation in the molding mold through a high-pressure air pipe; the high-pressure air pipe is provided with a pressure gauge for real-time measurement and display of the high-pressure gas pressure in the mold cavity. After adopting this structure, the use of a programmable pressure reducing valve in the mold pressure relief system can control the high-pressure gas in the mold cavity to release pressure at a set pressure reduction rate (such as 25MPa / s, 50MPa / s, etc.), which helps to purposefully regulate the pore structure and pore size of the polymer molded foamed product, thereby effectively controlling the quality of the product.

[0018] The principle of the present invention is:

[0019] In the structural design of the compression mold, by setting an annular gap between the electromagnetic induction coil and the inner wall of the mold cooling pipe, it can not only ensure that the electromagnetic induction coil carrying the high-frequency current and the metal compression mold base are always in an electrically isolated state during the heating process of the compression mold, but also when high-frequency alternating current is passed into the electromagnetic induction coil, an alternating electromagnetic field will be generated in the annular gap, thereby inducing a high-density eddy current on the wall of the mold cooling pipe and generating a large amount of Joule heat. As a heating heat source for the compression mold, the mold cavity can be quickly heated to a predetermined high temperature (such as the foaming temperature of the polymer material), and has a high heating efficiency. In addition, the electromagnetic induction coil is arranged in the cooling water channel, which greatly improves the cooling efficiency of the compression mold, further shortens the molding cycle of the compression foaming, and improves the production efficiency of the compression foaming products. On the one hand, the heat source can be quickly cooled by pumping cooling water into the annular gap. On the other hand, the annular gap, as a circulation pipe for the mold cooling medium, has a smaller cross-sectional area. Under the premise of the same mass flow rate of the cooling medium, the flow rate of the cooling medium in the annular gap is higher and the heat exchange capacity is also stronger.

[0020] By setting different materials for the cavity plate and the cavity retaining plate, and for the core plate and the core retaining plate, it is possible to heat a local area of ​​the mold cavity rather than the entire molding mold, which greatly reduces heat loss during the mold heating process and improves energy utilization, thereby effectively shortening the molding cycle of molded foaming and improving the production efficiency of molded foam products.

[0021] Compared with the existing supercritical fluid molding foaming device, the present invention has the following advantages and effects:

[0022] 1. Placing the electromagnetic induction coil directly in the mold cooling pipe and setting an annular gap can greatly improve the heating efficiency and cooling efficiency and further shorten the molding cycle of compression foaming.

[0023] 2. The electromagnetic induction coil is directly arranged in the mold cooling pipe, which simplifies the structure of the molding die, reduces the processing and manufacturing cost and improves the strength of the mold.

[0024] 3. It can heat only the local area of ​​the mold cavity instead of the entire mold, which greatly reduces the heat loss during the mold heating process and improves energy utilization.

[0025] 4. A programmable pressure reducing valve is set in the mold pressure relief system, which can relieve the pressure of the high-pressure supercritical fluid in the mold cavity according to the set pressure reduction rate. The controllable pressure relief rate provides an effective means for regulating the structure and size of the foam cells in the molded foam products, and also provides a guarantee for the quality control of the molded foam products. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic diagram of the structure of a supercritical fluid-assisted polymer compression foaming device.

[0027] Figure 2 yes Figure 1 Middle AA section view.

[0028] Figure 3 It is a structural schematic diagram of the molding die.

[0029] Figure 4 It is a schematic diagram of the structural assembly of the cavity half mold.

[0030] Figure 5 It is a schematic diagram of the structural assembly of the core half mold.

[0031] The reference numerals in the above figures are as follows: 1—molding die; 100—mold cooling pipe; 101—main pipe; 102—mold cavity; 103—sealing gasket; 104—screw; 105—electromagnetic induction coil; 106—annular gap; 107—sealing ring; 108—branch pipe; 109—porous metal plug; 110—thermocouple; 11—mold cavity half; 12—mold core half; 111—mold cavity mounting plate; 112—mold cavity retaining plate; 113—mold cavity plate; 121—mold core mounting plate; 122—mold core retaining plate; 123—mold core plate; 2—mould cooling system; 201—cooling water tower; 202—boosting water pump; 203—water inlet solenoid valve; 3—mould drainage system; 301—air compressor; 302—gas valve; 303—check valve; 4—supercritical fluid generation and supply system; 401—gas storage tank; 402—inlet solenoid valve; 403—high-pressure metering pump; 404—check valve; 5—mould pressure relief system; 501—exhaust solenoid valve; 502—programmed pressure reducing valve; 503—muffler; 504—pressure relief nozzle; 601—high-pressure gas pipe; 602—pressure gauge. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with specific implementation methods.

[0033] A supercritical fluid-assisted polymer compression foaming device comprises a compression mold 1 provided with a mold cavity, a mold cooling system 2 for supplying cooling water, a mold drainage system 3 for quickly discharging cooling water, a supercritical fluid generation and supply system 4 for injecting supercritical fluid into the mold cavity, and a mold pressure relief system 5 for quickly releasing high-pressure gas in the mold cavity; it also comprises an electromagnetic induction coil 105 for passing high-frequency alternating current to electromagnetically heat the compression mold 1; a mold cooling pipe 100 for accommodating cooling water is provided in the compression mold 1, and the shape of the mold cooling pipe 100 corresponds to the shape of the electromagnetic induction coil 105, so that the electromagnetic induction coil 105 is arranged in the mold cooling pipe 100, and an annular gap 106 is left between the electromagnetic induction coil 105 and the inner wall of the mold cooling pipe 100.

[0034] The mold cooling pipe 100 is wavy, including multiple straight pipe sections arranged in parallel with each other and curved pipe sections connecting adjacent straight pipe sections; the electromagnetic induction coil 105 is wavy, including multiple straight pipe sections arranged in parallel with each other and U-shaped sections connecting adjacent straight pipe sections. In this embodiment, the number of main pipe sections and straight pipe sections are both six.

[0035] The cross section of the mold cooling pipe 100 is circular, rectangular, U-shaped or elliptical; the distance between the electromagnetic induction coil 105 and the inner wall of the mold cooling pipe 100 is 1 to 5 mm. In this embodiment, the cross section of the mold cooling pipe 100 is circular, and the distance between the electromagnetic induction coil 105 and the inner wall of the mold cooling pipe 100 is 3 mm.

[0036] The number of the mold cavities 102 is one or more; in the projection in the depth direction of the mold cavities 102, the mold cooling pipe 100 covers all the mold cavities 102; at least one temperature sensor for monitoring the temperature of the mold cavity is provided in the molding die 1. In this embodiment, the number of the mold cavity 102 is one, Figure 1 In the projection in the up-down direction, the mold cooling pipe 100 covers the mold cavity 102, thereby ensuring the heating and cooling effect. The temperature sensor adopts a thermocouple 110, which is evenly distributed near the surface of the mold cavity.

[0037] The compression mold 1 includes a cavity half mold 11 and a core half mold 12, both of which are assembled structures; after the compression mold 1 is closed, the front faces of the cavity half mold 11 and the core half mold 12 form a mold cavity 102; a sealing gasket 103 is provided on the parting surface of the cavity half mold 11 and the core half mold 12.

[0038] The cavity half mold 11 includes a cavity mounting plate 111, a cavity retaining plate 112 and a cavity plate 113 connected in sequence by screws 104; the core half mold 12 includes a core mounting plate 121, a core retaining plate 122 and a core plate 123 connected in sequence by screws 104; mold cooling pipes 100 are provided between the cavity retaining plate 112 and the cavity plate 113, and between the core retaining plate 122 and the core plate 123; and sealing rings 107 are provided between the cavity retaining plate 112 and the cavity plate 113, and between the core retaining plate 122 and the core plate 123 to prevent cooling water leakage. In this embodiment, wave-shaped sealing rings 107 are provided on both sides of the mold cooling pipe 100.

[0039] The cavity plate 113 and the core plate 123 are made of a metal material with high magnetic permeability; the cavity retaining plate 112 and the core retaining plate 122 are made of a non-magnetic metal or non-metallic material. The metal material with high magnetic permeability refers to a material with good magnetic conductivity, thereby ensuring the electromagnetic heating effect. In this embodiment, the metal material with high magnetic permeability is stainless steel, and other types of mold steel, such as AISI 1045, AISI 718, etc., can also be selected. The non-magnetic metal is an aluminum alloy, and copper alloy, magnesium alloy, etc. can also be selected.

[0040] Several main pipelines 101 for conveying supercritical fluid are provided in the cavity plate 113 and the core plate 123, each main pipeline 101 is connected to multiple branch pipelines 108, and a porous metal plug 109 is provided at the end of the branch pipeline 108; the porous metal plug 109 is installed in the installation hole on the surface of the mold cavity, and the end face of the porous metal plug 109 is flush with the surface of the mold cavity; the supercritical fluid generation and supply system 4 and the mold pressure relief system 5 are both connected to the main pipeline 101.

[0041] The mold cooling system 2 includes a cooling water tower 201, a booster water pump 202, and a water inlet solenoid valve 203 connected in sequence; the mold drainage system 3 includes an air compressor 301, an air valve 302, and a one-way valve 303 connected in sequence; the water inlet solenoid valve 203 and the one-way valve 303 are both connected to the mold cooling pipeline 100.

[0042] The supercritical fluid generation and supply system 4 includes a gas storage tank 401, an air intake solenoid valve 402, a high-pressure metering pump 403, and a one-way solenoid valve 404 connected in sequence; the mold pressure relief system 5 includes an exhaust solenoid valve 501, a programmable pressure reducing valve 502, a muffler 503, and a pressure relief nozzle 504 connected in sequence; the one-way solenoid valve 404 and the exhaust solenoid valve 501 are connected to the main pipeline 101 for supercritical fluid transportation in the molding mold 1 through a high-pressure gas pipe 601; the high-pressure gas pipe 601 is provided with a pressure gauge 602 for real-time measurement and display of the high-pressure gas pressure in the mold cavity. The supercritical fluid is supercritical carbon dioxide, supercritical nitrogen, or a mixed gas in any proportion thereof.

[0043] The working process of the supercritical fluid assisted polymer molding foaming device includes the following steps:

[0044] (1) Preheating the compression mold: A high-frequency (e.g., 30 kHz) alternating current is passed through the electromagnetic induction coil 105 to excite an alternating electromagnetic field in the annular gap 106. The inner wall of the mold cooling pipe 100 cuts the magnetic flux lines and induces high-density eddy currents and generates a large amount of Joule heat, which can serve as an internal heat source of the compression mold 1 and can quickly heat the cavity plate 113 and the core plate 123. When the temperature of the cavity 102 (also called the mold cavity) area measured by the thermocouple 110 reaches the foaming temperature of the polymer material (e.g., 150°C), the current of the electromagnetic induction coil 105 is cut off to stop the mold heating.

[0045] (2) Injection of supercritical fluid: a prefabricated polymer product (such as an injection-molded polyurethane shoe midsole) is placed in the mold cavity 102, the molding die 1 is closed, and the supercritical fluid generation and supply system 4 is started (i.e., the air inlet solenoid valve 402 is opened, and the high-pressure metering pump 403 is started), so that the carbon dioxide gas (which may also be nitrogen or a mixed gas of carbon dioxide and nitrogen in any ratio) stored in the gas storage tank 401 is pressurized to a supercritical state by the high-pressure metering pump 403, and then injected into the mold cavity 102 through the one-way solenoid valve 404, the high-pressure gas pipe 601, the supercritical fluid delivery main pipeline 101, the branch pipeline 108, and the porous metal plug 109. The supercritical carbon dioxide quickly diffuses in the mold cavity 102 and dissolves in the polymer product until it reaches a saturated state, and then the supercritical fluid generation and supply system 4 is closed.

[0046] (3) Rapid pressure relief and foaming: Start the mold pressure relief system 5 (i.e., open the exhaust solenoid valve 501 and the programmable pressure reducing valve 502), and the high-pressure supercritical carbon dioxide in the mold cavity 102 is quickly released into the atmosphere at a set pressure relief rate (e.g., 15 MPa / s) through the porous metal plug 109, the branch pipeline 108, the supercritical fluid delivery main pipeline 101, the high-pressure air pipe 601, the exhaust solenoid valve 501, the programmable pressure reducing valve 502, the muffler 503 and the pressure relief nozzle 504. When the pressure gauge 602 monitors that the gas pressure in the mold cavity 102 is reduced to the set value (e.g., 3 MPa, 0.1 MPa, etc.), the mold pressure relief system 5 is closed.

[0047] (4) Cooling of the compression mold: Turn on the mold cooling system 2, that is, open the water inlet solenoid valve 203 and start the booster water pump 202. The cooling water in the cooling water tower 201 is continuously pumped into the mold cooling pipe 100 in the compression mold 1 to quickly cool the mold. When the thermocouple 110 monitors that the temperature of the mold cavity 102 drops to the demolding temperature of the polymer foam product (such as 40°C), turn off the mold cooling system 2.

[0048] (5) Draining the molding die: Open the mold drainage system 3, that is, start the air compressor 301 and open the air valve 302. The compressed air quickly discharges the residual cooling water in the mold cooling pipe 100, and then close the air valve 302. Then, open the molding die 1 and take out the polymer foamed product (such as a foamed polyurethane shoe midsole) to prepare for the next molding foaming cycle.

[0049] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A supercritical fluid-assisted polymer compression foaming device, comprising a compression mold with a mold cavity, a mold cooling system for supplying cooling water, a mold drainage system for quickly discharging cooling water, a supercritical fluid generation and supply system for injecting supercritical fluid into the mold cavity, and a mold pressure relief system for quickly releasing high-pressure gas in the mold cavity, characterized in that: It also includes an electromagnetic induction coil that is fed with high-frequency alternating current to electromagnetically heat the molding die; a mold cooling pipe containing cooling water is provided in the molding die, the shape of the mold cooling pipe corresponds to the shape of the electromagnetic induction coil, the electromagnetic induction coil is arranged in the mold cooling pipe, and an annular gap is left between the electromagnetic induction coil and the inner wall of the mold cooling pipe.

2. The supercritical fluid-assisted polymer compression foaming device according to claim 1, characterized in that: The mold cooling pipeline is wavy, including multiple straight pipe sections arranged in parallel with each other and curved pipe sections connecting adjacent straight pipe sections; the electromagnetic induction coil is wavy, including multiple straight pipe sections arranged in parallel with each other and U-shaped sections connecting adjacent straight pipe sections.

3. The supercritical fluid-assisted polymer compression foaming device according to claim 2, characterized in that: The cross section of the mold cooling pipe is circular, rectangular, U-shaped or elliptical; the distance between the electromagnetic induction coil and the inner wall of the mold cooling pipe is 1 to 5 mm.

4. The supercritical fluid-assisted polymer compression foaming device according to claim 2, characterized in that: The number of the mold cavities is one or more; in the projection in the depth direction of the mold cavities, the mold cooling pipeline covers all the mold cavities; and at least one temperature sensor for monitoring the temperature of the mold cavity is arranged in the molding die.

5. The supercritical fluid-assisted polymer compression foaming device according to claim 1, characterized in that: The compression mold comprises a cavity half mold and a core half mold; after the compression mold is closed, the front faces of the cavity half mold and the core half mold form a mold cavity; and a sealing gasket is arranged on the parting surface of the cavity half mold and the core half mold.

6. The supercritical fluid-assisted polymer compression foaming device according to claim 5, characterized in that: The cavity half mold includes a cavity mounting plate, a cavity retaining plate and a cavity plate which are sequentially connected by screws; the core half mold includes a core mounting plate, a core retaining plate and a core plate which are sequentially connected by screws; mold cooling pipes are provided between the cavity retaining plate and the cavity plate, and between the core retaining plate and the core plate; sealing rings are provided between the cavity retaining plate and the cavity plate, and between the core retaining plate and the core plate to prevent leakage of cooling water.

7. The supercritical fluid-assisted polymer compression foaming device according to claim 6, characterized in that: The cavity plate and the core plate are made of metal material with high magnetic permeability; the cavity retaining plate and the core retaining plate are made of non-magnetic metal or non-metal material.

8. The supercritical fluid-assisted polymer compression foaming device according to claim 6, characterized in that: Several main pipelines for conveying supercritical fluid are opened in the cavity plate and the core plate, each main pipeline is connected to multiple branch pipelines, and porous metal plugs are provided at the ends of the branch pipelines; the porous metal plugs are installed in the mounting holes on the surface of the mold cavity, and the end faces of the porous metal plugs are flush with the surface of the mold cavity; the supercritical fluid generation and supply system and the mold pressure relief system are both connected to the main pipelines.

9. The supercritical fluid-assisted polymer compression foaming device according to claim 1, characterized in that: The mold cooling system includes a cooling water tower, a booster water pump, and a water inlet solenoid valve connected in sequence; the mold drainage system includes an air compressor, an air valve, and a one-way valve connected in sequence; the water inlet solenoid valve and the one-way valve are both connected to the mold cooling pipeline.

10. The supercritical fluid-assisted polymer compression foaming device according to claim 1, characterized in that: The supercritical fluid generation and supply system includes a gas storage tank, an air intake solenoid valve, a high-pressure metering pump, and a one-way solenoid valve connected in sequence; the mold pressure relief system includes an exhaust solenoid valve, a programmable pressure reducing valve, a muffler, and a pressure relief nozzle connected in sequence; the one-way solenoid valve and the exhaust solenoid valve are connected to the main pipeline for supercritical fluid transportation in the molding mold through a high-pressure air pipe; the high-pressure air pipe is provided with a pressure gauge for real-time measurement and display of the high-pressure gas pressure in the mold cavity.

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