A raw material pretreatment system and a pretreatment method for preparing a foamed material

Abstract

The application discloses a raw material pretreatment system and method for preparing foamed materials, belongs to the technical field of raw material pretreatment for preparing foamed materials, and aims at solving the problem that the existing technology lacks a device for positively or negatively treating low-viscosity raw materials, so that the purpose of preparing foamed materials with lower or higher PPI values by changing the gas dissolving capacity of the low-viscosity raw materials cannot be realized. The raw material pretreatment system is arranged between a raw material area and a production area, a feeding end of the raw material pretreatment system is in communication with a discharging end of the raw material area, and a discharging end of the raw material pretreatment system is in communication with a feeding end of the production area. The raw material pretreatment system comprises a raw material feeding pipeline, a positive pressure treatment unit, a positive pressure raw material discharging pipeline, a negative pressure treatment unit, a negative pressure raw material discharging pipeline and a production area feeding pipeline. The application is mainly used as a device for positively or negatively pretreating foamed material production raw materials.

Description

Technical Field

[0001] This application belongs to the field of raw material pretreatment technology for foamed material preparation, specifically relating to a raw material pretreatment system and pretreatment method for preparing foamed materials. Background Technology

[0002] Low-viscosity raw materials (polyisocyanates with a viscosity between 0 and 500 centipoise) are the main raw materials for preparing foamed materials. The PPI (Polyisocyanate Polyimide) index of foamed materials is an important indicator that determines the type of foamed material (PPI refers to the number of pores in a 1-inch length of sponge). The PPI value can be adjusted by changing the proportions of the raw materials in the foamed material preparation formula. To prepare a foamed material with large pores, the PPI value can be decreased by changing the proportions of the raw materials; to prepare a foamed material with small pores, the PPI value can be increased by changing the proportions of the raw materials. Currently, in the field of foamed material preparation, adjusting the PPI value by changing the proportions of the raw materials is the primary method. The PPI value method has certain limitations. Adjusting the PPI value using this method generally limits it to between 15 and 90, which can meet the needs of most foam material preparations. If you want to further reduce or increase the PPI value within this range, you need to change the working environment by establishing a positive or negative pressure production environment and using fully automated production equipment. This greatly increases production costs, making it unaffordable for some small and medium-sized enterprises. Therefore, reducing production costs while achieving lower or higher PPI values ​​is an urgent problem to be solved in the field of foam material preparation.

[0003] Application content

[0004] This application aims to address the problem in the existing field of foam material preparation that the need to change the working environment to further modify the PPI value leads to a significant increase in production costs, and thus provides a raw material pretreatment system and pretreatment method for preparing foam materials.

[0005] A raw material pretreatment system for preparing foamed materials is provided. The raw material pretreatment system is located between a raw material area and a production area, and the inlet end of the raw material pretreatment system is connected to the outlet end of the raw material area, while the outlet end of the raw material pretreatment system is connected to the inlet end of the production area. The raw material pretreatment system includes a raw material inlet pipeline, a positive pressure treatment unit, a positive pressure raw material outlet pipeline, a negative pressure treatment unit, a negative pressure raw material outlet pipeline, and a production area inlet pipeline.

[0006] The raw material feed pipeline has two discharge ends and one feed end;

[0007] The feed pipeline in the production area has two feed ends and one discharge end;

[0008] The feed end of the raw material feed pipeline is connected to the discharge end of the raw material area. One discharge end of the raw material feed pipeline is connected to the feed end of the positive pressure processing unit. The discharge end of the positive pressure processing unit is connected to the feed end of the positive pressure raw material discharge pipeline. The discharge end of the positive pressure raw material discharge pipeline is connected to one feed end of the production area feed pipeline. The other discharge end of the raw material feed pipeline is connected to the feed end of the negative pressure processing unit. The discharge end of the negative pressure processing unit is connected to the feed end of the negative pressure raw material discharge pipeline. The discharge end of the negative pressure raw material discharge pipeline is connected to the other feed end of the production area feed pipeline. The discharge end of the production area feed pipeline is connected to the feed end of the production area.

[0009] Furthermore, the raw material feeding pipeline includes a main raw material feeding pipeline, a positive pressure processing branch pipeline, and a negative pressure processing branch pipeline. The inlet end of the main raw material feeding pipeline is connected to the outlet end of the raw material area. One end of the positive pressure processing branch pipeline is connected to one outlet end of the main raw material feeding pipeline, and the other end of the positive pressure processing branch pipeline is connected to the inlet end of the positive pressure processing unit. One end of the negative pressure processing branch pipeline is connected to another outlet end of the main raw material feeding pipeline, and the other end of the negative pressure processing branch pipeline is connected to the inlet end of the negative pressure processing unit. A first flow limiting valve is connected in series on the main raw material feeding pipeline, a second flow limiting valve is connected in series on the positive pressure processing branch pipeline, and a third flow limiting valve is connected in series on the negative pressure processing branch pipeline.

[0010] Furthermore, the positive pressure raw material discharge pipeline is connected in series with a No. 4 flow limiting valve, a positive pressure raw material power pump, a No. 1 pressure gauge, and a No. 5 flow limiting valve along the direction of raw material movement.

[0011] Furthermore, the positive pressure raw material discharge pipeline also includes a positive pressure raw material discharge diversion pipeline. One end of the positive pressure raw material discharge diversion pipeline is connected to the positive pressure raw material discharge pipeline, and the connection point between the positive pressure raw material discharge diversion pipeline and the positive pressure raw material discharge pipeline is located between the No. 5 flow limiting valve and the discharge end of the positive pressure raw material discharge pipeline. The other end of the positive pressure raw material discharge diversion pipeline is connected to another inlet end in the production area feed pipeline. A No. 1 diversion pipeline flow limiting valve is connected in series on the positive pressure raw material discharge diversion pipeline.

[0012] Furthermore, the positive pressure treatment unit includes a positive pressure treatment tank and a positive pressure treatment tank level gauge. The positive pressure treatment tank level gauge is located on one side of the positive pressure treatment tank, and the lower end of the positive pressure treatment tank level gauge is connected to the lower part of the positive pressure treatment tank. The upper end of the positive pressure treatment tank level gauge is connected to the upper part of the positive pressure treatment tank. The top of the positive pressure treatment tank is provided with a positive pressure inlet, a positive pressure air injection port, and a positive pressure port. The positive pressure treatment tank is connected to the other end of the positive pressure treatment branch pipeline through the positive pressure inlet. The positive pressure treatment tank is connected to a positive pressure gauge through the positive pressure port. The positive pressure treatment tank is connected to the air injection system through the positive pressure air injection port. The bottom of the positive pressure treatment tank is provided with a positive pressure outlet. The positive pressure treatment tank is connected to the inlet end of the positive pressure raw material discharge pipeline through the positive pressure outlet. The side of the positive pressure treatment tank is provided with a positive pressure observation port, and a high-pressure tempered glass is installed on the positive pressure observation port.

[0013] Furthermore, the negative pressure raw material discharge pipeline includes a No. 6 flow limiting valve, a negative pressure raw material power pump, a No. 2 pressure gauge, and a No. 7 flow limiting valve connected in series along the direction of raw material movement;

[0014] Furthermore, the negative pressure raw material discharge pipeline also includes a negative pressure raw material discharge diversion pipeline. One end of the negative pressure raw material discharge diversion pipeline is connected to the negative pressure raw material discharge pipeline, and the connection point between the negative pressure raw material discharge diversion pipeline and the negative pressure raw material discharge pipeline is located between the No. 7 flow limiting valve and the discharge end of the negative pressure raw material discharge pipeline. The other end of the negative pressure raw material discharge diversion pipeline is connected to one of the inlet ends of the production area feed pipeline. A No. 2 branch pipeline flow limiting valve is connected in series on the negative pressure raw material discharge diversion pipeline.

[0015] Furthermore, the negative pressure treatment unit includes a negative pressure treatment tank and a negative pressure treatment tank level gauge. The negative pressure treatment tank level gauge is located on one side of the negative pressure treatment tank, and the lower end of the negative pressure treatment tank level gauge is connected to the lower part of the negative pressure treatment tank. The upper end of the negative pressure treatment tank level gauge is connected to the upper part of the negative pressure treatment tank. The top of the negative pressure treatment tank is provided with a negative pressure inlet, a negative pressure exhaust port, and a negative pressure port. The negative pressure treatment tank is connected to the other end of the negative pressure treatment branch pipeline through the negative pressure inlet. The negative pressure treatment tank is connected to a negative pressure gauge through the negative pressure pressure port. The negative pressure treatment tank is connected to an exhaust system through the negative pressure exhaust port. The bottom of the negative pressure treatment tank is provided with a negative pressure outlet, and the negative pressure treatment tank is connected to the inlet end of the negative pressure raw material discharge pipeline through the negative pressure outlet. The side of the negative pressure treatment tank is provided with a negative pressure observation port, and a high-pressure tempered glass is installed on the negative pressure observation port.

[0016] Furthermore, the feed pipeline in the production area includes a main feed pipeline, a large-capacity feed branch pipeline, and a small-capacity feed branch pipeline. The discharge end of the main feed pipeline is connected to the feed end of the production area. The feed end of the large-capacity feed branch pipeline is connected to the discharge end of the positive pressure raw material discharge pipeline and the discharge end of the negative pressure raw material discharge diversion pipeline. The discharge end of the large-capacity feed branch pipeline is connected to one feed end of the main feed pipeline. The feed end of the small-capacity feed branch pipeline is connected to the discharge end of the negative pressure raw material discharge pipeline and the discharge end of the positive pressure raw material discharge diversion pipeline. The discharge end of the small-capacity feed branch pipeline is connected to the other feed end of the main feed pipeline. A large-capacity power pump is connected in series on the large-capacity feed branch pipeline, and a small-capacity power pump is connected in series on the small-capacity feed branch pipeline.

[0017] Furthermore, the raw material pretreatment system also includes a positive pressure reflux pipeline and a negative pressure reflux pipeline;

[0018] One end of the positive pressure reflux pipeline is connected to the positive pressure raw material discharge pipeline, and the connection point between the positive pressure reflux pipeline and the positive pressure raw material discharge pipeline is located at pressure gauge No. 1 and flow limiting valve No. 5. The other end of the positive pressure reflux pipeline is connected to the positive pressure reflux port on the positive pressure treatment tank. A positive pressure reflux flow limiting valve is connected in series on the positive pressure reflux pipeline.

[0019] One end of the negative pressure reflux pipeline is connected to the negative pressure raw material discharge pipeline, and the connection point between the negative pressure reflux pipeline and the negative pressure raw material discharge pipeline is located at pressure gauge No. 2 and flow limiting valve No. 7. The other end of the negative pressure reflux pipeline is connected to the negative pressure reflux port on the negative pressure treatment tank, and a negative pressure reflux flow limiting valve is connected in series on the negative pressure reflux pipeline.

[0020] A positive pressure treatment method implemented by a raw material pretreatment system for preparing foamed materials: the method is achieved through the following steps:

[0021] Step 1: Open flow restrictor valves 1 and 2, and close flow restrictor valve 3 to allow the raw material to enter the positive pressure processing unit;

[0022] Step 2: Observe the material feeding situation through the level gauge of the positive pressure treatment tank. When the material reaches the predetermined height, close the No. 2 flow limiting valve.

[0023] Step 3: Inject nitrogen into the positive pressure treatment tank to pressurize and treat the raw materials under positive pressure. The process is as follows: First, inject nitrogen into the positive pressure treatment tank and control the pressure inside the tank within the range of 0.2 to 1 MPa. Then, continuously spray the raw materials into the treatment tank through high pressure to achieve a mist-like dispersion effect, increase the contact area between the raw materials and the nitrogen in the tank, improve the dissolution efficiency of nitrogen in the raw materials, increase the solubility of nitrogen in the raw materials, and increase the overall number of gas nuclei in the raw materials, thereby increasing the number of sponge pores. The raw materials are sprayed into the tank from the top, and after atomization and dispersion, the contact time with nitrogen is 1 to 2 seconds. The storage time in the treatment tank is 0.5 to 2 hours.

[0024] Step 4: After the positive pressure treatment is completed, shut down the nitrogen injection system and open the No. 4 flow restriction valve. Driven by the positive pressure raw material power pump, the treated raw material passes through the No. 1 pressure gauge. Compare the reading of the No. 1 pressure gauge with the pressure value suitable for production. When the pressure value is within the permissible range, open the No. 5 flow restriction valve, and the treated raw material enters the feed pipeline of the production area. When the pressure value is not within the permissible range, close the No. 5 flow restriction valve and open the positive pressure return flow restriction valve, so that the raw material circulates along the positive pressure return pipeline until the pressure value enters the permissible range.

[0025] Step 5: After the pressure value in Step 4 reaches the permissible range, open the No. 5 flow limiting valve and close the positive pressure backflow limiting valve to allow the raw material to enter the feed pipeline in the production area. Select the feeding pipeline according to the production mode and product requirements. When the size or material usage of the foam material to be produced is small, the raw material after positive pressure treatment is supplied through the positive pressure raw material outlet diversion pipeline and the small capacity feed diversion pipeline. When the size or material usage of the foam material to be produced is large, the raw material after positive pressure treatment is supplied through the positive pressure raw material outlet pipeline and the large capacity feed diversion pipeline.

[0026] A negative pressure treatment method implemented in a raw material pretreatment system for preparing foamed materials: the method is achieved through the following steps:

[0027] Step 1: Open flow restrictor valves 1 and 3, and close flow restrictor valve 2 to allow the raw material to enter the negative pressure treatment unit;

[0028] Step 2: Observe the material feeding situation through the liquid level gauge of the negative pressure treatment tank. When the material reaches the predetermined height, close the No. 3 flow limiting valve.

[0029] Step 3: Extract gas from the negative pressure treatment tank to treat the raw material under negative pressure. The process is as follows: First, gas is extracted from the negative pressure treatment tank to create negative pressure. The negative pressure control range is 0-600 mmHg. Then, the raw material is continuously sprayed into the treatment tank through high pressure to achieve a mist dispersion effect. During the spraying process, under the negative pressure of the negative pressure treatment tank, the solubility of the gas in the raw material is reduced, causing the gas to escape from the raw material, reducing the gas content in the raw material, achieving the purpose of reducing gas nuclei, and thus reducing the number of sponge pores. The time for the gas to escape after the raw material is sprayed from the top of the tank and atomized is 1-2 seconds. The storage time in the treatment tank is 0.5-2 hours.

[0030] Step 4: After the negative pressure treatment is completed, shut down the air extraction system and open the No. 6 flow restriction valve. Driven by the negative pressure raw material power pump, the treated raw material passes through the No. 2 pressure gauge. Compare the reading of the No. 2 pressure gauge with the pressure value suitable for production. When the pressure value is within the permissible range, open the No. 7 flow restriction valve, and the treated raw material enters the feed pipeline of the production area. When the pressure value is not within the permissible range, close the No. 7 flow restriction valve and open the negative pressure return flow restriction valve to allow the raw material to circulate along the negative pressure return pipeline until the pressure value enters the permissible range.

[0031] Step 5: After the pressure value in Step 4 reaches the permissible range, open the No. 7 flow limiting valve and close the negative pressure backflow limiting valve to allow the raw material to enter the feed pipeline in the production area. Select the feeding pipeline according to the production mode and product requirements. When the size or material used to produce the foaming material is small, the raw material after negative pressure treatment is supplied through the negative pressure raw material outlet pipeline and the small-capacity feed branch pipeline. When the size or material used to produce the foaming material is large, the raw material after negative pressure treatment is supplied through the negative pressure raw material outlet branch pipeline and the large-capacity feed branch pipeline.

[0032] The beneficial effects of this application compared to the prior art are:

[0033] This patent provides a raw material pretreatment system for preparing foamed materials. It can pretreat low-viscosity raw materials in the foaming material preparation process. By applying positive and negative pressure to the low-viscosity raw materials, its ability to dissolve gases is altered. Positive pressure treatment enhances the gas-dissolving ability, resulting in a higher PPI value (small-pore foam) for the final foamed material. Conversely, negative pressure treatment weakens the gas-dissolving ability, resulting in a lower PPI value (large-pore foam). While adjusting the raw material ratio to reach a PPI limit, this method can further expand the PPI range while ensuring the PPI limit is met. Through pretreatment of low-viscosity raw materials, the PPI can be... The limit value of I has been expanded from the conventional 15-90 to 6-120, greatly expanding the product range of foamed materials. Moreover, this raw material pretreatment system can be improved from the existing raw material feeding system by upgrading the existing raw material tank to a pressure tank and adding positive pressure air injection holes or negative pressure air extraction holes during tank preparation. Finally, it can be achieved with the corresponding air injection or extraction system. Compared with building a positive or negative pressure working environment and using fully automated production equipment, the investment cost of the solution provided in this application is very low, only 1 / 15 to 1 / 20 of the cost of building a positive or negative pressure working environment, but it can achieve the same purpose as building a positive or negative pressure working environment. It is an optimized solution that is very suitable for small and medium-sized production enterprises to carry out phased upgrades and phased expansion of production scope. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the layout of the raw material pretreatment system described in this application;

[0035] Figure 2 This is a schematic diagram of the arrangement of the raw material feed pipeline in the raw material pretreatment system described in this application;

[0036] Figure 3 This is a schematic diagram showing the arrangement of the positive pressure treatment unit in the raw material pretreatment system described in this application;

[0037] Figure 4 This is a schematic diagram showing the arrangement of the negative pressure treatment unit in the raw material pretreatment system described in this application;

[0038] Figure 5 This is a schematic diagram of the layout of the positive pressure raw material discharge pipeline in the raw material pretreatment system described in this application;

[0039] Figure 6 This is a schematic diagram of the layout of the negative pressure raw material discharge pipeline in the raw material pretreatment system described in this application;

[0040] Figure 7This is a schematic diagram of the layout of the feed pipeline in the production area of ​​the raw material pretreatment system described in this application;

[0041] In the diagram: 1. Raw material area; 2. Raw material feed pipeline; 21. Main raw material feed pipeline; 22. No. 1 flow restrictor valve; 23. Positive pressure treatment branch pipeline; 24. No. 2 flow restrictor valve; 25. Negative pressure treatment branch pipeline; 26. No. 3 flow restrictor valve; 3. Positive pressure treatment unit; 31. Positive pressure treatment tank; 32. Positive pressure feed inlet; 33. Positive pressure air injection port; 34. Positive pressure pressure port; 35. Positive pressure treatment tank level gauge; 36. Positive pressure observation port; 37. Positive pressure reflux port; 38. Positive pressure discharge port; 4. Positive pressure reflux pipeline; 5. Positive pressure raw material discharge pipeline; 51. No. 4 flow restrictor valve; 52. Positive pressure raw material power pump; 53. No. 1 pressure gauge; 54. No. 5 flow restrictor valve; 6. Positive pressure raw material discharge branch pipeline. 7. Negative pressure treatment unit, 71. Negative pressure treatment tank, 72. Negative pressure feed inlet, 73. Negative pressure exhaust port, 74. Negative pressure port, 75. Negative pressure treatment tank level gauge, 76. Negative pressure observation port, 77. Negative pressure reflux port, 78. Negative pressure discharge port, 8. Negative pressure reflux pipeline, 9. Negative pressure raw material discharge pipeline, 91. No. 6 flow limiting valve, 92. Negative pressure raw material power pump, 93. No. 2 pressure gauge, 94. No. 7 flow limiting valve, 10. Negative pressure raw material discharge diversion pipeline, 11. Production area, 12. Production area feed pipeline, 121. Main pipeline, 122. Large capacity feed branch pipeline, 123. Large capacity power pump, 124. Small capacity feed branch pipeline and 125. Small capacity power pump. Detailed Implementation

[0042] Specific implementation method one: Combining Figures 1 to 7 This embodiment describes a raw material pretreatment system located between the raw material area 1 and the production area 11. The inlet of the raw material pretreatment system is connected to the outlet of the raw material area 1, and the outlet of the raw material pretreatment system is connected to the inlet of the production area 11. The raw material pretreatment system includes a raw material inlet pipeline 2, a positive pressure processing unit 3, a positive pressure raw material outlet pipeline 5, a negative pressure processing unit 7, a negative pressure raw material outlet pipeline 9, and a production area inlet pipeline 12.

[0043] The raw material feed pipeline 2 has two discharge ends and one feed end;

[0044] The production area feed pipeline 12 has two feed ends and one discharge end;

[0045] The feed end of the raw material feed pipe 2 is connected to the discharge end of the raw material area 1. One discharge end of the raw material feed pipe 2 is connected to the feed end of the positive pressure processing unit 3. The discharge end of the positive pressure processing unit 3 is connected to the feed end of the positive pressure raw material discharge pipe 5. The discharge end of the positive pressure raw material discharge pipe 5 is connected to one feed end of the production area feed pipe 12. The other discharge end of the raw material feed pipe 2 is connected to the feed end of the negative pressure processing unit 7. The discharge end of the negative pressure processing unit 7 is connected to the feed end of the negative pressure raw material discharge pipe 9. The discharge end of the negative pressure raw material discharge pipe 9 is connected to the other feed end of the production area feed pipe 12. The discharge end of the production area feed pipe 12 is connected to the feed end of the production area 11.

[0046] Specific Implementation Method Two: Combining Figures 1 to 7 This embodiment differs from Specific Embodiment 1 in that the raw material feed pipeline 2 includes a main raw material feed pipeline 21, a positive pressure processing branch pipeline 23, and a negative pressure processing branch pipeline 25. The feed end of the main raw material feed pipeline 21 is connected to the discharge end of the raw material zone 1. One end of the positive pressure processing branch pipeline 23 is connected to one discharge end of the main raw material feed pipeline 21, and the other end is connected to the feed end of the positive pressure processing unit 3. One end of the negative pressure processing branch pipeline 25 is connected to the other discharge end of the main raw material feed pipeline 21, and the other end is connected to the feed end of the negative pressure processing unit 7. A first flow limiting valve 22 is connected in series on the main raw material feed pipeline 21, a second flow limiting valve 24 is connected in series on the positive pressure processing branch pipeline 23, and a third flow limiting valve 26 is connected in series on the negative pressure processing branch pipeline 25. Other components and connections are the same as in Specific Embodiment 1.

[0047] In this embodiment, in order to achieve the purpose of positive and negative pressure treatment of raw materials, the raw material feed pipeline 2 adopts a diversion pipe design, wherein the positive pressure treatment branch pipeline 23 is connected to the positive pressure treatment unit 3, and the negative pressure treatment branch pipeline 25 is connected to the negative pressure treatment unit 7. A flow limiting valve is provided on the positive pressure treatment branch pipeline 23 and the negative pressure treatment branch pipeline 25 respectively, which can ensure that when feeding material at one end, the other end can be closed.

[0048] Specific implementation method three: Combining Figures 1 to 7 This embodiment differs from Specific Embodiment Two in that, in this embodiment, the positive pressure raw material discharge pipeline 5 is connected in series along the direction of raw material movement, with a No. 4 flow limiting valve 51, a positive pressure raw material power pump 52, a No. 1 pressure gauge 53, and a No. 5 flow limiting valve 54. Other components and connections are the same as in Specific Embodiment Two.

[0049] In this embodiment, the No. 4 flow limiting valve 51 is used to control the opening and closing of the first end of the positive pressure raw material discharge pipeline 5, the positive pressure raw material power pump 52 provides power for extracting raw materials, the No. 1 pressure gauge 53 is used to detect the pressure value of the positive pressure raw material discharge pipeline 5, and the No. 5 flow limiting valve 54 is used to control the opening and closing of the end of the positive pressure raw material discharge pipeline 5. The No. 5 flow limiting valve 54 is set in conjunction with the positive pressure return pipeline 4. When the pressure value detected by the No. 1 pressure gauge 53 is unstable or unfavorable for production, it will be internally circulated through the positive pressure return pipeline 4. At this time, the No. 5 flow limiting valve 54 is in the closed state until the pressure value detected by the No. 1 pressure gauge 53 is stable or favorable for production. Then the No. 5 flow limiting valve 54 will open. The raw material after positive pressure treatment enters the production area feed pipeline 12 along the positive pressure raw material discharge pipeline 5 and is finally used for production.

[0050] Specific implementation method four: Combination Figures 1 to 7 This embodiment differs from Specific Embodiment Three in that the positive pressure raw material discharge pipeline 5 further includes a positive pressure raw material discharge diversion pipeline 6. One end of the positive pressure raw material discharge diversion pipeline 6 is connected to the positive pressure raw material discharge pipeline 5, and the connection point between the positive pressure raw material discharge diversion pipeline 6 and the positive pressure raw material discharge pipeline 5 is located between the No. 5 flow limiting valve 54 and the discharge end of the positive pressure raw material discharge pipeline 5. The other end of the positive pressure raw material discharge diversion pipeline 6 is connected to another inlet end of the production area inlet pipeline 12. A No. 1 branch pipeline flow limiting valve is connected in series on the positive pressure raw material discharge diversion pipeline 6. Other components and connections are the same as in Specific Embodiment Three.

[0051] In this embodiment, the positive pressure raw material discharge diversion pipeline 6 is used to cooperate with the large-capacity power pump 123 and the small-capacity power pump 125 in the production area feed pipeline 12. After the positive pressure raw material discharge diversion pipeline 6 is led out, it is connected to the small-capacity feed branch pipeline 124 where the small-capacity power pump 125 is located. The original discharge end of the positive pressure raw material discharge pipeline 5 is connected to the large-capacity feed branch pipeline 122 where the large-capacity power pump 123 is located. The purpose is to select the appropriate feed channel for feeding according to the feeding requirements of different production raw materials. If the size or material used to be produced is small, the raw material after positive pressure treatment is supplied through the positive pressure raw material discharge diversion pipeline 6 and the small-capacity feed branch pipeline 124. If the size or material used to be produced is large, the raw material after positive pressure treatment is supplied through the positive pressure raw material discharge pipeline 5 and the large-capacity feed branch pipeline 122. By rationally planning the feeding route, power loss can be reduced and production costs can be reduced.

[0052] Specific Implementation Method Five: Combining Figures 1 to 7This embodiment differs from specific embodiment four in that the positive pressure treatment unit 3 includes a positive pressure treatment tank 31 and a positive pressure treatment tank level gauge 35. The positive pressure treatment tank level gauge 35 is disposed on one side of the positive pressure treatment tank 31, and its lower end is connected to the lower part of the positive pressure treatment tank 31, while its upper end is connected to the upper part of the positive pressure treatment tank 31. The top of the positive pressure treatment tank 31 is provided with a positive pressure inlet 32, a positive pressure air injection port 33, and a positive pressure port 34. The positive pressure treatment tank 31 is connected to the other end of the positive pressure treatment branch pipeline 23 via the positive pressure inlet 32. The positive pressure treatment tank 31 is connected to the positive pressure gauge via the positive pressure port 34. The positive pressure treatment tank 31 is connected to the gas injection system via the positive pressure gas injection port 33. A positive pressure outlet 38 is provided at the bottom of the positive pressure treatment tank 31, and it is connected to the inlet end of the positive pressure raw material discharge pipeline 5 via the positive pressure outlet 38. A positive pressure observation port 36 is provided on the side of the positive pressure treatment tank 31, and a high-pressure tempered glass is installed on the positive pressure observation port 36. Other components and connections are the same as in specific embodiment four.

[0053] In this embodiment, the positive pressure treatment tank level gauge 35 is used to observe the entry of raw materials into the positive pressure treatment tank 31, and the positive pressure gas injection port 33 is used to inject gas into the positive pressure treatment tank 31 to increase the pressure inside the tank, perform positive pressure treatment on the production raw materials, and improve the raw materials' ability to dissolve gas.

[0054] Specific Implementation Method Six: Combination Figures 1 to 7 This embodiment differs from specific embodiment five in that the negative pressure raw material outlet pipeline 9 includes a No. 6 flow limiting valve 91, a negative pressure raw material power pump 92, a No. 2 pressure gauge 93, and a No. 7 flow limiting valve 94 connected in series along the raw material movement direction. Other components and connections are the same as in specific embodiment five.

[0055] In this embodiment, the No. 6 flow-limiting valve 91 is used to control the opening and closing of the first end of the negative pressure raw material discharge pipeline 9, the negative pressure raw material power pump 92 provides power for extracting raw materials, the No. 2 pressure gauge 93 is used to detect the pressure value of the negative pressure raw material discharge pipeline 9, and the No. 7 flow-limiting valve 94 is used to control the opening and closing of the end of the negative pressure raw material discharge pipeline 9. The No. 7 flow-limiting valve 94 is set up in conjunction with the negative pressure return pipeline 8. When the pressure value detected by the No. 2 pressure gauge 93 is unstable or unfavorable for production, it will be processed through the negative pressure return pipeline 8 for internal circulation. At this time, the No. 7 flow-limiting valve 94 is in the closed state until the pressure value detected by the No. 2 pressure gauge 93 is stable or favorable for production. Then the No. 7 flow-limiting valve 94 will open. The raw material after negative pressure treatment enters the production area feed pipeline 12 along the negative pressure raw material discharge pipeline 9 and is finally used for production.

[0056] Specific implementation method seven: Combining Figures 1 to 7This embodiment differs from Specific Embodiment Six in that the negative pressure raw material discharge pipeline 9 further includes a negative pressure raw material discharge diversion pipeline 10. One end of the negative pressure raw material discharge diversion pipeline 10 is connected to the negative pressure raw material discharge pipeline 9, and the connection point between the negative pressure raw material discharge diversion pipeline 10 and the negative pressure raw material discharge pipeline 9 is located between the No. 7 flow limiting valve 94 and the discharge end of the negative pressure raw material discharge pipeline 9. The other end of the negative pressure raw material discharge diversion pipeline 10 is connected to one of the inlet ends of the production area inlet pipeline 12. A No. 2 branch pipeline flow limiting valve is connected in series on the negative pressure raw material discharge diversion pipeline 10. Other components and connections are the same as in Specific Embodiment Six.

[0057] In this embodiment, the negative pressure raw material discharge diversion pipeline 10 is used to cooperate with the large-capacity power pump 123 and the small-capacity power pump 125 in the production area feed pipeline 12. After the negative pressure raw material discharge diversion pipeline 10 is led out, it is connected to the large-capacity feed branch pipeline 122 where the large-capacity power pump 123 is located. The original discharge end of the negative pressure raw material discharge pipeline 9 is connected to the large-capacity feed branch pipeline 124 where the small-capacity power pump 125 is located. The purpose is to select the appropriate feed channel for feeding according to the feeding requirements of different production raw materials. If the size or material used to be produced is small, the raw material after positive pressure treatment is fed through the negative pressure raw material discharge pipeline 9 and the small-capacity feed branch pipeline 124. If the size or material used to be produced is large, the raw material after positive pressure treatment is fed through the negative pressure raw material discharge diversion pipeline 10 and the large-capacity feed branch pipeline 122. By rationally planning the feeding route, power loss can be reduced and production costs can be reduced.

[0058] Specific implementation method eight: Combination Figures 1 to 7 This embodiment differs from specific embodiment seven in that the negative pressure treatment unit 7 includes a negative pressure treatment tank 71 and a negative pressure treatment tank level gauge 75. The negative pressure treatment tank level gauge 75 is disposed on one side of the negative pressure treatment tank 71, and its lower end is connected to the lower part of the negative pressure treatment tank 71, while its upper end is connected to the upper part of the negative pressure treatment tank 71. The top of the negative pressure treatment tank 71 is provided with a negative pressure inlet 72, a negative pressure exhaust port 73, and a negative pressure port 74. The negative pressure treatment tank 71 is connected to the other end of the negative pressure treatment branch pipeline 25 via the negative pressure inlet 72. The negative pressure treatment tank 71 is connected to the negative pressure gauge via the negative pressure port 74. The negative pressure treatment tank 71 is connected to the air extraction system via the negative pressure exhaust port 73. A negative pressure outlet 78 is provided at the bottom of the negative pressure treatment tank 71, and is connected to the inlet end of the negative pressure raw material discharge pipeline 9 via the negative pressure outlet 78. A negative pressure observation port 76 is provided on the side of the negative pressure treatment tank 71, and a high-pressure tempered glass is installed on the negative pressure observation port 76. Other components and connections are the same as in specific embodiment seven.

[0059] In this embodiment, the liquid level 75 of the negative pressure treatment tank is used to observe the entry of raw materials into the negative pressure treatment tank 71, and the negative pressure exhaust port 73 is used to extract air from the negative pressure treatment tank 71 to reduce the pressure inside the tank, perform negative pressure treatment on the production raw materials, and reduce the ability of the raw materials to dissolve gases.

[0060] Specific Implementation Method Nine: Combining Figures 1 to 7 This embodiment differs from specific embodiment eight in that the production area feed pipeline 12 includes a main feed pipeline 121, a large-capacity feed branch pipeline 122, and a small-capacity feed branch pipeline 124. The discharge end of the main feed pipeline 121 is connected to the feed end of the production area 11. The feed end of the large-capacity feed branch pipeline 122 is connected to the discharge end of the positive pressure raw material discharge pipeline 5 and the discharge end of the negative pressure raw material discharge diversion pipeline 10. The large-capacity feed branch pipeline 124... The discharge end of pipe 22 is connected to one inlet end of the main feed pipe 121. The inlet end of the small-capacity feed branch pipe 124 is connected to the discharge end of the negative pressure raw material discharge pipe 9 and the discharge end of the positive pressure raw material discharge diversion pipe 6. The discharge end of the small-capacity feed branch pipe 124 is connected to the other inlet end of the main feed pipe 121. A large-capacity power pump 123 is connected in series on the large-capacity feed branch pipe 122, and a small-capacity power pump 125 is connected in series on the small-capacity feed branch pipe 124. Other components and connection methods are the same as in specific embodiment eight.

[0061] Specific Implementation Method Ten: Combining Figures 1 to 7 This embodiment differs from specific embodiment nine in that the raw material pretreatment system further includes a positive pressure reflux pipe 4 and a negative pressure reflux pipe 8.

[0062] One end of the positive pressure reflux pipe 4 is connected to the positive pressure raw material discharge pipe 5, and the connection point between the positive pressure reflux pipe 4 and the positive pressure raw material discharge pipe 5 is located at pressure gauge 53 and flow limiting valve 54. The other end of the positive pressure reflux pipe 4 is connected to the positive pressure reflux port 37 on the positive pressure treatment tank 31. A positive pressure reflux flow limiting valve is connected in series on the positive pressure reflux pipe 4.

[0063] One end of the negative pressure reflux pipe 8 is connected to the negative pressure raw material discharge pipe 9, and the connection point between the negative pressure reflux pipe 8 and the negative pressure raw material discharge pipe 9 is located at pressure gauge 93 and flow limiting valve 94. The other end of the negative pressure reflux pipe 8 is connected to the negative pressure reflux port 77 on the negative pressure treatment tank 71. A negative pressure reflux flow limiting valve is connected in series on the negative pressure reflux pipe 8. Other components and connection methods are the same as in specific embodiment nine.

[0064] In this embodiment, the positive pressure return pipeline 4 is a feedback pressure stabilizing pipeline for positive pressure raw material processing. When the pressure in the positive pressure raw material discharge pipeline 5 is not sufficient to meet production requirements as detected by pressure gauge 53, it can be self-circulated and adjusted through the positive pressure return pipeline 4 until the pressure is stabilized or meets production requirements before flowing into the production area. The negative pressure return pipeline 8 is a feedback pressure stabilizing pipeline for negative pressure raw material processing. When the pressure in the negative pressure raw material discharge pipeline 9 is not sufficient to meet production requirements as detected by pressure gauge 93, it can be self-circulated and adjusted through the negative pressure return pipeline 8 until the pressure is stabilized or meets production requirements before flowing into the production area.

[0065] Detailed Implementation Method Eleven: Combining Figures 1 to 7 This embodiment describes a positive pressure pretreatment method for raw materials implemented in a raw material pretreatment system for preparing foamed materials. The method is achieved through the following steps:

[0066] Step 1: Open flow limiting valve 22 and flow limiting valve 24, and close flow limiting valve 26 to allow the raw material to enter the positive pressure processing unit 3;

[0067] Step 2: Observe the material feeding situation through the positive pressure treatment tank level gauge 35. When the material reaches the predetermined height, close the No. 2 flow limiting valve 24.

[0068] Step 3: Inject nitrogen into the positive pressure treatment tank 31 to pressurize and treat the raw material under positive pressure. The treatment process is as follows: First, inject nitrogen into the positive pressure treatment tank 31 and control the pressure inside the tank, which is within the range of 0.2 to 1 MPa. Then, continuously spray the raw material into the treatment tank through high pressure to achieve a mist dispersion effect, increase the contact area between the raw material and the nitrogen in the tank, improve the dissolution efficiency of nitrogen in the raw material, increase the solubility of nitrogen in the raw material, and increase the number of gas nuclei in the raw material, thereby increasing the number of sponge pores. The raw material is sprayed into the tank from the top, and after atomization and dispersion, the contact time with nitrogen is 1 to 2 seconds. The storage time in the treatment tank is 0.5 to 2 hours.

[0069] Step 4: After the positive pressure treatment is completed, shut down the nitrogen injection system and open the No. 4 flow limiting valve 51. Driven by the positive pressure raw material power pump 52, the treated raw material passes through the No. 1 pressure gauge 53. Compare the reading of the No. 1 pressure gauge 53 with the pressure value suitable for production. When the pressure value is within the permissible range, open the No. 5 flow limiting valve 54, and the treated raw material enters the feed pipeline 12 of the production area. When the pressure value is not within the permissible range, close the No. 5 flow limiting valve 54 and open the positive pressure return flow limiting valve, so that the raw material can circulate along the positive pressure return pipeline 4 until the pressure value enters the permissible range.

[0070] Step 5: After the pressure value in Step 4 reaches the permissible range, open the No. 5 flow limiting valve 54 and close the positive pressure backflow limiting valve to allow the raw material to enter the feed pipeline 12 in the production area. Select the feeding pipeline according to the production mode and product requirements. When the size or material used to produce the foaming material is small, the raw material after positive pressure treatment is supplied through the positive pressure raw material outlet diversion pipeline 6 and the small capacity feed pipeline 124. When the size or material used to produce the foaming material is large, the raw material after positive pressure treatment is supplied through the positive pressure raw material outlet pipeline 5 and the large capacity feed pipeline 122.

[0071] Detailed Implementation Method Twelve: Combining Figures 1 to 7 This embodiment describes a raw material negative pressure pretreatment method implemented by a raw material pretreatment system for preparing foamed materials. The method is achieved through the following steps:

[0072] Step 1: Open flow limiting valve 22 and flow limiting valve 26, and close flow limiting valve 24 to allow the raw material to enter the negative pressure treatment unit 7;

[0073] Step 2: Observe the raw material feeding situation through the liquid level gauge 75 of the negative pressure treatment tank. When the raw material reaches the predetermined height, close the No. 3 flow limiting valve 26.

[0074] Step 3: Extract gas from negative pressure treatment tank 71 to treat the raw material under negative pressure. The process is as follows: First, gas is extracted from negative pressure treatment tank 71 to create negative pressure. The negative pressure control range is 0-600 mmHg. Then, the raw material is continuously sprayed into the treatment tank under high pressure to achieve a mist dispersion effect. During the spraying process, under negative pressure in negative pressure treatment tank 71, the solubility of the gas in the raw material is reduced, causing the gas to escape from the raw material, reducing the gas content in the raw material, achieving the purpose of reducing gas nuclei, and thus reducing the number of sponge pores. The time for the gas to escape after the raw material is sprayed from the top of the tank and atomized is 1-2 seconds. The storage time in the treatment tank is 0.5-2 hours.

[0075] Step 4: After the negative pressure treatment is completed, shut down the air extraction system and open the No. 6 flow limiting valve 91. Driven by the negative pressure raw material power pump 92, the treated raw material passes through the No. 2 pressure gauge 93. Compare the reading of the No. 2 pressure gauge 93 with the pressure value suitable for production. When the pressure value is within the permissible range, open the No. 7 flow limiting valve 94 and the treated raw material enters the feed pipeline 12 of the production area. When the pressure value is not within the permissible range, close the No. 7 flow limiting valve 94 and open the negative pressure return flow limiting valve to allow the raw material to circulate along the negative pressure return pipeline 8 until the pressure value enters the permissible range.

[0076] Step 5: After the pressure value in Step 4 reaches the permissible range, open the No. 7 flow limiting valve 94 and close the negative pressure backflow limiting valve to allow the raw material to enter the feed pipeline 12 in the production area. Select the feeding pipeline according to the production mode and product requirements. When the size or material used to produce the foaming material is small, the raw material after negative pressure treatment is supplied through the negative pressure raw material discharge pipeline 9 and the small capacity feed branch pipeline 124. When the size or material used to produce the foaming material is large, the raw material after negative pressure treatment is supplied through the negative pressure raw material discharge branch pipeline 10 and the large capacity feed branch pipeline 122.

[0077] This application has disclosed the preferred embodiments as above, but it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the structure and technical content disclosed above to create equivalent embodiments without departing from the scope of the technical solution of this application. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the content of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A raw material pretreatment system for preparing foamed materials, characterized in that: The raw material pretreatment system is located between the raw material area (1) and the production area (11), and the feed end of the raw material pretreatment system is connected to the discharge end of the raw material area (1), and the discharge end of the raw material pretreatment system is connected to the feed end of the production area (11). The raw material pretreatment system includes a raw material feed pipeline (2), a positive pressure treatment unit (3), a positive pressure raw material discharge pipeline (5), a negative pressure treatment unit (7), a negative pressure raw material discharge pipeline (9), and a production area feed pipeline (12). The raw material feed pipeline (2) has two discharge ends and one feed end; The production area feed pipeline (12) has two feed ends and one discharge end; The feed end of the raw material feed pipeline (2) is connected to the discharge end of the raw material area (1). One discharge end of the raw material feed pipeline (2) is connected to the feed end of the positive pressure processing unit (3). The discharge end of the positive pressure processing unit (3) is connected to the feed end of the positive pressure raw material discharge pipeline (5). The discharge end of the positive pressure raw material discharge pipeline (5) is connected to one feed end of the production area feed pipeline (12). The other discharge end of the raw material feed pipeline (2) is connected to the feed end of the negative pressure processing unit (7). The discharge end of the negative pressure processing unit (7) is connected to the feed end of the negative pressure raw material discharge pipeline (9). The discharge end of the negative pressure raw material discharge pipeline (9) is connected to the other feed end of the production area feed pipeline (12). The discharge end of the production area feed pipeline (12) is connected to the feed end of the production area (11).

2. The raw material pretreatment system for preparing foamed materials according to claim 1, characterized in that: The raw material feed pipeline (2) includes a main raw material feed pipeline (21), a positive pressure processing branch pipeline (23), and a negative pressure processing branch pipeline (25). The feed end of the main raw material feed pipeline (21) is connected to the discharge end of the raw material area (1). One end of the positive pressure processing branch pipeline (23) is connected to one discharge end of the main raw material feed pipeline (21), and the other end of the positive pressure processing branch pipeline (23) is connected to the feed end of the positive pressure processing unit (3). One end of the negative pressure processing branch pipeline (25) is connected to another discharge end of the main raw material feed pipeline (21), and the other end of the negative pressure processing branch pipeline (25) is connected to the feed end of the negative pressure processing unit (7). A first flow limiting valve (22) is connected in series on the main raw material feed pipeline (21), a second flow limiting valve (24) is connected in series on the positive pressure processing branch pipeline (23), and a third flow limiting valve (26) is connected in series on the negative pressure processing branch pipeline (25).

3. The raw material pretreatment system for preparing foamed materials according to claim 2, characterized in that: The positive pressure raw material discharge pipeline (5) is connected in series with a No. 4 flow limiting valve (51), a positive pressure raw material power pump (52), a No. 1 pressure gauge (53), and a No. 5 flow limiting valve (54) along the direction of raw material movement. The negative pressure raw material discharge pipeline (9) includes a No. 6 flow limiting valve (91), a negative pressure raw material power pump (92), a No. 2 pressure gauge (93), and a No. 7 flow limiting valve (94) connected in series along the direction of raw material movement. The positive pressure raw material discharge pipeline (5) also includes a positive pressure raw material discharge diversion pipeline (6). One end of the positive pressure raw material discharge diversion pipeline (6) is connected to the positive pressure raw material discharge pipeline (5), and the connection point between the positive pressure raw material discharge diversion pipeline (6) and the positive pressure raw material discharge pipeline (5) is located between the No. 5 flow limiting valve (54) and the discharge end of the positive pressure raw material discharge pipeline (5). The other end of the positive pressure raw material discharge diversion pipeline (6) is connected to another inlet end of the production area feed pipeline (12). A No. 1 branch pipeline flow limiting valve is connected in series on the positive pressure raw material discharge diversion pipeline (6).

4. The raw material pretreatment system for preparing foamed materials according to claim 3, characterized in that: The positive pressure treatment unit (3) includes a positive pressure treatment tank (31) and a positive pressure treatment tank level gauge (35). The positive pressure treatment tank level gauge (35) is located on one side of the positive pressure treatment tank (31), and the lower end of the positive pressure treatment tank level gauge (35) is connected to the lower part of the positive pressure treatment tank (31), while the upper end of the positive pressure treatment tank level gauge (35) is connected to the upper part of the positive pressure treatment tank (31). The top of the positive pressure treatment tank (31) is provided with a positive pressure inlet (32), a positive pressure air injection port (33), and a positive pressure port (34). The positive pressure treatment tank (31) is connected to the positive pressure inlet. (32) Connected to the other end of the positive pressure treatment branch pipe (23), the positive pressure treatment tank (31) is connected to the positive pressure gauge through the positive pressure port (34), the positive pressure treatment tank (31) is connected to the gas injection system through the positive pressure gas injection port (33), the bottom of the positive pressure treatment tank (31) is provided with a positive pressure discharge port (38), the positive pressure treatment tank (31) is connected to the feed end of the positive pressure raw material discharge pipeline (5) through the positive pressure discharge port (38), the side of the positive pressure treatment tank (31) is provided with a positive pressure observation port (36), and a high-pressure tempered glass is installed on the positive pressure observation port (36).

5. The raw material pretreatment system for preparing foamed materials according to claim 4, characterized in that: The negative pressure raw material discharge pipeline (9) also includes a negative pressure raw material discharge diversion pipeline (10). One end of the negative pressure raw material discharge diversion pipeline (10) is connected to the negative pressure raw material discharge pipeline (9), and the connection point between the negative pressure raw material discharge diversion pipeline (10) and the negative pressure raw material discharge pipeline (9) is located between the No. 7 flow limiting valve (94) and the discharge end of the negative pressure raw material discharge pipeline (9). The other end of the negative pressure raw material discharge diversion pipeline (10) is connected to one of the feed ends of the production area feed pipeline (12). A No. 2 branch pipeline flow limiting valve is connected in series on the negative pressure raw material discharge diversion pipeline (10).

6. The raw material pretreatment system for preparing foamed materials according to claim 5, characterized in that: The negative pressure treatment unit (7) includes a negative pressure treatment tank (71) and a negative pressure treatment tank level gauge (75). The negative pressure treatment tank level gauge (75) is located on one side of the negative pressure treatment tank (71), and the lower end of the negative pressure treatment tank level gauge (75) is connected to the lower part of the negative pressure treatment tank (71), while the upper end of the negative pressure treatment tank level gauge (75) is connected to the upper part of the negative pressure treatment tank (71). The top of the negative pressure treatment tank (71) is provided with a negative pressure inlet (72), a negative pressure exhaust port (73), and a negative pressure port (74). The negative pressure treatment tank (71) is connected to the negative pressure inlet. (72) Connected to the other end of the negative pressure treatment branch pipe (25), the negative pressure treatment tank (71) is connected to the negative pressure gauge through the negative pressure port (74), the negative pressure treatment tank (71) is connected to the air extraction system through the negative pressure extraction port (73), the bottom of the negative pressure treatment tank (71) is provided with a negative pressure discharge port (78), the negative pressure treatment tank (71) is connected to the feed end of the negative pressure raw material discharge pipeline (9) through the negative pressure discharge port (78), the side of the negative pressure treatment tank (71) is provided with a negative pressure observation port (76), and a high-pressure tempered glass is installed on the negative pressure observation port (76).

7. The raw material pretreatment system for preparing foamed materials according to claim 6, characterized in that: The production area feed pipeline (12) includes a main feed pipeline (121), a large-capacity feed branch pipeline (122), and a small-capacity feed branch pipeline (124). The discharge end of the main feed pipeline (121) is connected to the feed end of the production area (11). The feed end of the large-capacity feed branch pipeline (122) is connected to the discharge end of the positive pressure raw material discharge pipeline (5) and the discharge end of the negative pressure raw material discharge diversion pipeline (10). The discharge end of the large-capacity feed branch pipeline (122) is connected to the main feed pipeline (124). One feed end of 121 is connected to the feed end of the small-capacity feed branch pipe (124), the feed end of the small-capacity feed branch pipe (124) is connected to the discharge end of the negative pressure raw material discharge pipe (9) and the discharge end of the positive pressure raw material discharge branch pipe (6), the discharge end of the small-capacity feed branch pipe (124) is connected to the other feed end of the feed main pipe (121), a large-capacity power pump (123) is connected in series on the large-capacity feed branch pipe (122), and a small-capacity power pump (125) is connected in series on the small-capacity feed branch pipe (124).

8. A raw material pretreatment system for preparing foamed materials according to claim 7, characterized in that: The raw material pretreatment system also includes a positive pressure reflux pipe (4) and a negative pressure reflux pipe (8). One end of the positive pressure return pipe (4) is connected to the positive pressure raw material discharge pipe (5), and the connection point between the positive pressure return pipe (4) and the positive pressure raw material discharge pipe (5) is located at pressure gauge (53) and flow limiting valve (54). The other end of the positive pressure return pipe (4) is connected to the positive pressure return port (37) on the positive pressure treatment tank (31). A positive pressure return flow limiting valve is connected in series on the positive pressure return pipe (4). One end of the negative pressure return pipe (8) is connected to the negative pressure raw material discharge pipe (9), and the connection point between the negative pressure return pipe (8) and the negative pressure raw material discharge pipe (9) is located at pressure gauge No. 2 (93) and flow limiting valve No. 7 (94). The other end of the negative pressure return pipe (8) is connected to the negative pressure return port (77) on the negative pressure treatment tank (71). A negative pressure return flow limiting valve is connected in series on the negative pressure return pipe (8).

9. A method for positive pressure pretreatment of raw materials using the raw material pretreatment system for preparing foamed materials according to any one of claims 1 to 8, characterized in that: The method is implemented through the following steps: Step 1: Open the No. 1 flow limiting valve (22) and the No. 2 flow limiting valve (24), and close the No. 3 flow limiting valve (26) to allow the raw material to enter the positive pressure processing unit (3); Step 2: Observe the material feeding situation through the positive pressure treatment tank level gauge (35). When the material reaches the predetermined height, close the No. 2 flow limiting valve (24). Step 3: Inject nitrogen into the positive pressure treatment tank (31) to pressurize and perform positive pressure treatment on the raw materials; the treatment process is as follows: First, inject nitrogen into the positive pressure treatment tank (31) and control the pressure inside the treatment tank. The pressure range is 0.2~1MPa. Then, continuously spray the raw materials into the treatment tank through high pressure to achieve a mist dispersion effect, increase the contact area between the raw materials and the nitrogen in the storage tank, improve the dissolution efficiency of nitrogen in the raw materials, increase the solubility of nitrogen in the raw materials, and increase the number of gas nuclei in the raw materials to achieve the purpose of increasing the number of sponge pores. The raw materials are sprayed into the tank from the top. After atomization and dispersion, the contact time with nitrogen is 1~2 seconds. The storage time in the treatment tank is 0.5~2 hours. Step 4: After the positive pressure treatment is completed, close the nitrogen injection system and open the No. 4 flow limiting valve (51). Driven by the positive pressure raw material power pump (52), the treated raw material passes through the No. 1 pressure gauge (53). Compare the reading of the No. 1 pressure gauge (53) with the pressure value suitable for production. When the pressure value is within the permissible range, open the No. 5 flow limiting valve (54) and the treated raw material enters the feed pipeline (12) of the production area. When the pressure value is not within the permissible range, close the No. 5 flow limiting valve (54) and open the positive pressure return flow limiting valve to make the raw material self-circulate along the positive pressure return pipeline (4) until the pressure value enters the permissible range. Step 5: After the pressure value in Step 4 reaches the permissible range, open the No. 5 flow limiting valve (54) and close the positive pressure return flow limiting valve to allow the raw material to enter the feed pipeline (12) in the production area. Select the feeding pipeline according to the production mode and product requirements. When the size or material of the foam material to be produced is small, the raw material after positive pressure treatment is supplied through the positive pressure raw material discharge diversion pipeline (6) and the small capacity feed pipeline (124). When the size or material of the foam material to be produced is large, the raw material after positive pressure treatment is supplied through the positive pressure raw material discharge pipeline (5) and the large capacity feed pipeline (122).

10. A raw material negative pressure pretreatment method using the raw material pretreatment system for preparing foamed materials according to any one of claims 1 to 8, characterized in that: The method is implemented through the following steps: Step 1: Open the No. 1 flow limiting valve (22) and the No. 3 flow limiting valve (26), and close the No. 2 flow limiting valve (24) to allow the raw material to enter the negative pressure treatment unit (7); Step 2: Observe the material feeding situation through the liquid level gauge (75) of the negative pressure treatment tank. When the material reaches the predetermined height, close the No. 3 flow limiting valve (26). Step 3: Extract gas from the negative pressure treatment tank (71) and perform negative pressure treatment on the raw material; the treatment process is as follows: first, extract gas from the negative pressure treatment tank (71) to generate negative pressure in the negative pressure treatment tank (71). The negative pressure control range is 0 to 600 mmHg. Then, continuously spray the raw material into the treatment tank through high pressure to achieve a mist dispersion effect. During the spraying process, under the negative pressure of the negative pressure treatment tank (71), the solubility of the gas in the raw material will be reduced, causing the gas to escape from the raw material, reducing the gas content in the raw material, achieving the purpose of reducing gas nuclei, and thus reducing the number of sponge pores. The time for the gas to escape after the raw material is sprayed from the top of the tank and atomized is 1 to 2 seconds. The storage time in the treatment tank is 0.5 to 2 hours. Step 4: After the negative pressure treatment is completed, shut down the air extraction system and open the No. 6 flow limiting valve (91). Driven by the negative pressure raw material power pump (92), the treated raw material passes through the No. 2 pressure gauge (93). According to the reading of the No. 2 pressure gauge (93) and the pressure value suitable for production, when the pressure value is within the permissible range, open the No. 7 flow limiting valve (94) and the treated raw material enters the feed pipeline (12) of the production area. When the pressure value is not within the permissible range, close the No. 7 flow limiting valve (94) and open the negative pressure return flow limiting valve to make the raw material self-circulate along the negative pressure return pipeline (8) until the pressure value enters the permissible range. Step 5: After the pressure value in Step 4 reaches the permissible range, open the No. 7 flow limiting valve (94) and close the negative pressure return flow limiting valve to allow the raw material to enter the feed pipeline (12) in the production area. Select the feeding pipeline according to the production mode and product requirements. When the size or material used of the foaming material to be produced is small, the raw material after negative pressure treatment is supplied through the negative pressure raw material discharge pipeline (9) and the small capacity feed branch pipeline (124). When the size or material used of the foaming material to be produced is large, the raw material after negative pressure treatment is supplied through the negative pressure raw material discharge branch pipeline (10) and the large capacity feed branch pipeline (122).

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