Method for manufacturing foamed plastic by using foamed plastic mold

Abstract

The invention relates to a method for manufacturing foamed plastic through a foamed plastic mold, and relates to the field of foamed plastic manufacturing, in order to solve the problems that contact between raw material particles and steam is not uniform, and product quality is influenced, the method comprises the following steps that S1, a vibration base is started, and the raw material particles are added into an impurity removal box for impurity removal; s2, preheating the mold; s3, adding the raw material particles subjected to impurity removal into a mold cavity; s4, the steam input mechanism inputs steam into the mold cavity, the raw material particles are foamed, and the vibration base stops working; s5, cooling the mold; s6, compressed air is input into the mold cavity through an air input mechanism; and S7, the mold cavity is opened, and the formed foamed plastic is taken out. By arranging the vibration base, the raw material particles are evenly spread after entering the mold cavity, when part of the raw material particles are subjected to foaming forming, the remaining raw material particles move in the vibration process, the raw material particles make uniform contact with steam, the foaming efficiency and the foaming effect of the raw material particles are improved, and therefore the product quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of foam plastic manufacturing, and in particular to a method for manufacturing foam plastic using a foam plastic mold. Background Art

[0002] Foam plastic packaging boxes or packaging pads have the characteristics of light weight, good shock resistance and good sealing. They are widely used in medical, food, electromechanical, instrumentation and hardware, as well as daily product packaging.

[0003] EPS foam plastic is a common foam plastic. Its processing method is usually as follows: after EPS raw material particles are put into the mold cavity of the molding mold, steam is used to foam the EPS raw material particles, and then water is passed through the mold for cooling to separate the foam product from the metal mold. The mold is opened and water and compressed air are passed through to demold the product.

[0004] The following problems exist in the existing related technologies: after the EPS raw material particles are put into the mold cavity of the molding mold from the feed port of the molding mold, the EPS raw material particles are easily accumulated in the mold cavity, resulting in uneven contact between the steam and the EPS raw material particles inside the mold cavity after the steam is input. Some of the foamed plastics that foam first will affect the contact between the steam and the remaining EPS raw material particles, and the foaming efficiency of the remaining EPS raw material particles will be reduced, and the foaming effect will be worse, which will lead to an uneven structure of the molded foam plastic and poor structural strength. Summary of the invention

[0005] In order to enable the raw material particles put into the mold cavity to contact evenly with the input steam to form a foam plastic with a uniform and stable structure, the present application provides a method for manufacturing foam plastic using a foam plastic mold.

[0006] The present application provides a method for manufacturing foam plastics using a foam plastic mold, which adopts the following technical solution: A method for manufacturing foam plastics using a foam plastic mold comprises the following steps: S1: Start the vibration base and put the raw material particles into the impurity removal box for impurity removal; S2: Preheat the mold to raise the temperature of the mold and the cavity to a suitable temperature; S3: adding the raw material particles after impurities are removed from the impurity removal box into the mold cavity; S4: Steam is input into the mold cavity through the steam input mechanism, the raw material particles are foamed into molded foam plastics, and the vibration base stops working; S5: Cooling the mold to separate the molded foam plastic from the inner wall of the mold cavity; S6: Input compressed air into the mold cavity through the air input mechanism to demold the molded foam plastic; S7: Open the mold cavity and take out the molded foam plastic.

[0007] By adopting the above technical scheme, the present application is provided with a vibrating base, so that the raw material particles can be evenly spread out after entering the mold cavity without accumulation, and the raw material particles can be evenly heated by contacting with the preheated mold. When the steam enters the mold cavity, the raw material particles can be evenly contacted with the steam to improve the effect and efficiency of foaming molding of the raw material particles. At the same time, when some raw material particles are foaming, the remaining raw material particles move during the vibration process and achieve better contact with the steam. The raw material particles are foamed after moving their position, thereby preventing the formed foam plastic at one end of the mold cavity from affecting the continued foaming of the plastic particles there. Furthermore, the raw material particles can be spread out due to vibration during impurity removal, thereby improving the impurity removal effect.

[0008] Optionally, in step S2, the mold includes an upper mold, a lower mold and a mold core, the lower mold is fixedly connected to the vibration base, a mold cavity is formed between the upper mold and the lower mold, the mold core is arranged in the mold cavity, the upper mold is provided with a feed inlet connecting the mold cavity and the impurity removal box, and the lower mold is provided with a steam input port connected to the mold cavity.

[0009] By adopting the above technical scheme, the raw material particles after impurities are removed in the impurity removal box can be easily added into the mold cavity from the feed inlet, steam is introduced into the mold cavity from the steam input port, and the steam is discharged upward from the lower mold, which can make the raw material particles contact with the steam more evenly, thereby improving the foaming effect of the raw material particles.

[0010] Optionally, a plurality of air inlet micropores are provided on the lower mold and the mold core, and the steam input port is connected to the mold cavity through the air inlet micropores.

[0011] By adopting the above technical solution, after the steam is input from the steam input port, it enters the mold cavity through a number of air inlet micropores and is evenly distributed, thereby improving the uniformity of contact between the raw material particles and the steam. At the same time, since the aperture of the air inlet micropores is small, it can avoid blockage caused by the molded foam plastic entering the holes, so that steam can be continuously input.

[0012] Optionally, an annular flow channel for introducing heating water or cooling water is provided inside the upper mold and the lower mold.

[0013] By adopting the above technical scheme, passing heating water into the annular flow channel can preheat the upper mold and the lower mold, and passing cooling water into the annular flow channel can cool the upper mold and the lower mold. The structure is simple, the efficiency of preheating and cooling is improved, and the effect is better.

[0014] Optionally, in step S1, a rotating motor and a rotating platform are provided in the impurity removal box, the rotating platform is fixedly connected to the output shaft of the rotating motor, a limiting frame surrounding the circumference of the rotating platform is fixedly connected in the impurity removal box, a negative pressure impurity remover is provided above the rotating platform, the negative pressure impurity remover is connected to the air pump through a first air pipe, a feeding port for adding raw material particles to the rotating platform is provided on the impurity removal box, and a feeding channel connected to the feeding port is provided below the rotating platform.

[0015] By adopting the above technical scheme, the raw material particles are injected into the rotating platform through the blanking port and spread out. The dust and raw material particles with low density and light weight can be removed by the negative pressure impurity remover to avoid affecting the foaming effect of the raw material particles. After the impurities are removed, the rotating motor starts to drive the rotating platform to rotate, so that the raw material particles fall into the blanking channel and then enter the mold cavity for foaming molding.

[0016] Optionally, in step S3, the steam input mechanism includes a steam generator, a pressure sensor, a temperature sensor, an input pipe and a heat treatment box, one end of the input pipe is connected to the steam generator, and the other end is connected to the mold cavity through the steam input port, the heat treatment box is arranged on the input pipe to perform heat treatment on the steam, the pressure sensor and the temperature sensor are both arranged at the input end of the input pipe, the pressure sensor is connected to the steam generator to adjust the steam pressure, and the temperature sensor is connected to the heat treatment box to control the opening and closing of the heat treatment box.

[0017] By adopting the above technical solution, pressure sensors and temperature sensors can be used to monitor the pressure and temperature of the steam input into the mold cavity. According to processing needs, the steam generator adjusts the pressure of the output steam. At the same time, the heat treatment box is started or shut down according to processing needs. After the heat treatment box is started, it can heat treat the steam, increase the steam temperature, and convert saturated steam into superheated steam, so as to improve product processing efficiency and processing quality.

[0018] Optionally, an annular sealing ring is provided between the upper die and the lower die, one end of the annular sealing ring is connected to the input pipe, and the input pipe is connected to the steam input port through the other end of the annular sealing ring.

[0019] By adopting the above technical solution, since the steam input port is connected to the mold cavity through the air inlet micropores, the pressure of the air flow in the input pipe is relatively high before entering the steam input port, thereby enabling the annular sealing ring to deform and expand, thereby enhancing the sealing between the upper mold and the lower mold.

[0020] Optionally, the input pipeline is connected to the first air pipe and the first air pipe is provided with a diverter valve at the connection point, and the input pipeline is provided with a mixing mechanism for mixing air flow and steam.

[0021] By adopting the above technical solution, the airflow of the first air pipe can accelerate the flow of steam after entering the input pipe, so that the steam enters the mold cavity faster, thereby improving production efficiency.

[0022] Optionally, the mixing mechanism includes a diverter pipe, a focusing box and fan blades, both ends of the diverter pipe are connected to the focusing box, two fan blades are provided and are rotatably connected to the focusing box, the airflow mixed with steam in the input pipe enters the diverter pipe for diversion and is gathered in the focusing box, the airflow drives the corresponding fan blades to rotate to achieve mixing of the airflow and steam, and the airflow and steam in the focusing box flow into the input pipe.

[0023] By adopting the above technical solution, the air flow mixed with steam is diverted through the diversion pipe and then gathered in the focusing box. The rotation of the fan makes the air flow and steam mix more evenly, so that the steam enters the mold cavity and contacts the raw material particles more fully, thereby improving the foaming effect of the raw material particles.

[0024] Optionally, the heat treatment box includes a plurality of sub-treatment boxes, each of which is electrically connected to the temperature sensor, and the temperature sensor controls the opening and closing of the sub-treatment boxes according to temperature monitoring.

[0025] By adopting the above technical solution, the number of sub-processing boxes started can be increased according to processing needs, which can increase the heating distance of the steam in the input pipeline, thereby increasing the heating time, allowing the steam to be heated to a suitable temperature, further improving the efficiency and quality of product processing.

[0026] In summary, the present application includes at least the following beneficial technical effects: The present application is provided with a vibrating base, so that the raw material particles can be evenly spread out after entering the mold cavity without accumulation, and the raw material particles can be evenly heated by contacting with the preheated mold. When steam enters the mold cavity, the raw material particles can evenly contact with the steam to improve the effect and efficiency of foaming molding of the raw material particles. At the same time, when some raw material particles are foaming, the remaining raw material particles move during the vibration process and achieve better contact with the steam. The raw material particles are foamed after moving their positions, thereby preventing the formed foam plastic at one end of the mold cavity from affecting the continued foaming of the plastic particles at that location. Furthermore, the raw material particles can be spread out due to vibration during impurity removal, thereby improving the impurity removal effect.

[0027] After the steam is input from the steam input port, it enters the mold cavity evenly through a number of air inlet micropores, thereby improving the uniformity of contact between the raw material particles and the steam, thereby improving the foaming efficiency and effect of the raw material particles. At the same time, since the aperture of the air inlet micropores is small, it can avoid blockage caused by the molded foam plastic entering the holes, so that the steam can be continuously and stably input.

[0028] The present application can monitor the pressure and temperature of the steam input into the mold cavity by adopting a pressure sensor and a temperature sensor. According to the processing needs, the steam generator adjusts the pressure of the output steam. At the same time, the heat treatment box is started or shut down according to the processing needs. After the heat treatment box is started, it can heat treat the steam, increase the steam temperature, and convert saturated steam into superheated steam, so as to improve the product processing efficiency and processing quality.

[0029] In the present application, since the steam input port is connected to the mold cavity through the air inlet micropores, the pressure of the air flow in the input pipe is relatively high before entering the steam input port, thereby enabling the annular sealing ring to deform and expand, thereby enhancing the sealing between the upper mold and the lower mold.

[0030] The airflow mixed with steam in the input pipeline is diverted through the diverter pipe and then gathered in the focusing box. The rotation of the fan makes the airflow and steam mix more evenly, so that the steam enters the mold cavity and contacts the raw material particles more fully, thereby improving the foaming effect of the raw material particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of the application method; Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 3 It is a schematic diagram of the overall structure of the hybrid mechanism of an embodiment of the present application; Figure 4 This is a schematic diagram of the overall structure of the impurity removal box of an embodiment of the present application; Figure 5 It is a schematic diagram of the overall structure of the mold of an embodiment of the present application.

[0032] 1. Mould; 11. Upper mould; 111. Feed port; 112. Annular flow channel; 12. Lower mould; 121. Steam input port; 122. Air inlet micropore; 13. Mould core; 14. Mould cavity; 2. De-impurity box; 21. Rotating motor; 22. Rotating platform; 23. Limiting frame; 24. Negative pressure de-impurity device; 25. First air pipe; 26. Air pump; 27. Blanking port; 28. Blanking channel; 3. Vibrating base; 4. Steam input mechanism; 41. Steam generator; 42. Pressure sensor; 43. Temperature sensor; 44. Input pipeline; 45. Heat treatment box; 451. Sub-treatment box; 46. Mixing mechanism; 461. Diverter pipe; 462. Flow collecting box; 463. Fan blade; 5. Air input mechanism; 51. Air compressor; 52. Inlet pipe. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The application discloses a method for manufacturing foam plastics by using a foam plastic mold.

[0039] Reference Figure 1-5 A method for manufacturing foam plastics using a foam plastic mold comprises the following steps: S1: Start the vibration base 3, add the raw material particles into the impurity removal box 2 for impurity removal; the impurity removal box 2 is connected to the vibration base 3 through the mold 1, the inner wall of the impurity removal box 2 is fixedly connected with a rotating motor 21, the output shaft of the rotating motor 21 is fixedly connected with a rotating platform 22 which is initially horizontal, the inner wall of the impurity removal box 2 is fixedly connected with a limit frame 23 surrounding the circumference of the rotating platform 22, and a negative pressure impurity remover 24 is arranged above the rotating platform 22, and the negative pressure impurity remover 24 adopts the negative pressure impurity removal equipment commonly used in the art, and the negative pressure impurity remover 24 passes The first air pipe 25 is connected to the air pump 26, and the air pump 26 is started to make the negative pressure impurity remover 24 work to remove impurities. The top of the impurity removal box 2 is provided with a feeding port 27 for adding raw material particles to the rotating platform 22, and the bottom of the rotating platform 22 is provided with a feeding channel 28 connected with the feeding port 111 on the mold 1; in this embodiment, the raw material particles are EPS raw material particles, and the EPS raw material particles can be foamed when exposed to air or water vapor at 100°C, and then heated by air or water vapor at 115~120°C to be formed into foam plastic parts.

[0040] S2: preheating the mold 1, so that the mold 1 and the mold cavity 14 are heated to a suitable temperature; specifically, the mold 1 includes an upper mold 11, a lower mold 12 and a mold core 13, the upper mold 11 and the lower mold 12 are adapted to form a mold cavity 14, the lower mold 12 is fixedly connected to the vibration base 3, the impurity removal box 2 is fixedly connected to the upper mold 11, the mold core 13 is fixedly connected to the lower mold 12 by bolts and is located in the mold cavity 14, and the mold core 13 of different structures is used according to the shape of the product to be processed, the middle part of the upper mold 11 is provided with a feed port 111 connecting the mold cavity 14 and the impurity removal box 2, and the lower mold 12 is fixedly connected to the vibration base 3, and the impurity removal box 2 is fixedly connected to the upper mold 11. A steam input port 121 connected to the mold cavity 14 is opened in the middle, and a plurality of air inlet micropores 122 are opened on the lower mold 12 and the mold core 13, and the air inlet micropores 122 are all connected to the steam input port 121. After the steam is input through the steam input port 121, it can enter the mold cavity 14 through the plurality of air inlet micropores 122; in order to realize the preheating of the mold 1, annular flow channels 112 are opened inside the upper mold 11 and the lower mold 12, and the annular flow channel 112 surrounds the outside of the mold cavity 14. By introducing heating water into the annular flow channel 112, the temperature inside the mold 1 and the mold cavity 14 can be increased.

[0041] S3: adding the raw material particles after impurities are removed from the impurity removal box 2 into the mold cavity 14; starting the rotary motor 21 to rotate the rotary platform 22, and the raw material particles on the rotary platform 22 enter the mold cavity through the blanking channel 28 and the feed port 111.

[0042] S4: Steam is input into the mold cavity 14 through the steam input mechanism 4, the raw material particles are foamed into molded foam plastics, and the vibration base 3 stops working; the steam is selected as saturated steam or superheated steam according to the processing needs. The liquid in the saturated state is called saturated liquid, and its corresponding steam is saturated steam. The saturated steam continues to be heated, and its temperature will rise and exceed the saturation temperature under the pressure. This steam exceeding the saturation temperature is called superheated steam.

[0043] Specifically, the steam input mechanism 4 includes a steam generator 41, a pressure sensor 42, a temperature sensor 43, an input pipe 44 and a heat treatment box 45. One end of the input pipe 44 is connected to the gas exhaust port of the steam generator 41, and the other end is connected to the steam input port and communicates with the mold cavity 14 through the steam input port 121. The heat treatment box 45 is arranged on the input pipe 44 to perform heat treatment on the steam. The pressure sensor 42 and the temperature sensor 43 are both fixedly installed at the input end of the input pipe 44. The steam generator 41 adjusts the steam pressure according to the monitoring of the pressure sensor 42. The temperature sensor 43 is connected to the heat treatment box 45 to control the opening and closing of the heat treatment box 45.

[0044] More specifically, the heat treatment box 45 includes a plurality of sub-treatment boxes 451, which are sleeved on the outside of the input pipe 44. Each sub-treatment box 451 is electrically connected to the temperature sensor 43. The temperature sensor 43 controls the opening and closing of each sub-treatment box 451 according to temperature monitoring. Increasing the number of sub-treatment boxes 451 started according to processing needs can increase the heating distance of the steam in the input pipe 44, thereby increasing the heating time and allowing the steam to be heated to a suitable temperature, further improving the efficiency and quality of product processing. If there is no need to heat treat the saturated steam, all sub-treatment boxes 451 are closed.

[0045] Furthermore, an annular sealing ring 15 is provided between the upper mold 11 and the lower mold 12, one end of the annular sealing ring 15 is connected to the input pipe 44, and the input pipe 44 is connected to the steam input port 121 through the other end of the annular sealing ring 15. Since the steam input port is connected to the mold cavity through the air inlet micropores, the pressure of the air flow in the input pipe is relatively large before entering the steam input port, which can cause the annular sealing ring to deform and expand, thereby enhancing the sealing between the upper mold and the lower mold.

[0046] Furthermore, the input pipe 44 is connected to the first air pipe 25 and the first air pipe 25 is provided with a diverter valve 29 at the connection. When the raw material particles are being cleaned, the airflow is allowed to enter the negative pressure cleaner 24 through the diverter valve 29 for cleaning. When the raw material particles are being foamed, the airflow is allowed to enter the input pipe 44 through the diverter valve 29. The input pipe 44 is provided with a mixing mechanism 46 for mixing airflow and steam. In this embodiment, the mixing mechanism 46 includes a diverter pipe 461, a focusing box 462 and a fan blade 463. Both ends of the diverter pipe 461 are connected to the focusing box 462. Two fan blades 463 are provided and both are rotatably connected to the focusing box 462. The airflow mixed with steam in the input pipe 44 enters the diversion pipe 461 for diversion and gathers in the focusing box 462. The airflow drives the corresponding fan blades 463 to rotate to achieve mixing of the airflow and the steam. The airflow and steam in the focusing box 462 flow into the input pipe 44. The airflow mixed with steam is diverted through the diversion pipe and then enters the focusing box for gathering. The rotation of the fan makes the airflow and the steam mixed more evenly, so that the steam enters the mold cavity and contacts the raw material particles more fully, thereby improving the foaming effect of the raw material particles.

[0047] S5: Cooling the mold 1 to separate the molded foam plastic from the inner wall of the mold cavity 14; by introducing cooling water into the annular flow channel 112, the temperature inside the mold 1 and the mold cavity 14 is reduced, thereby separating the molded foam plastic from the inner wall of the mold cavity 14.

[0048] S6: Compressed air is input into the mold cavity 14 through the air input mechanism 5 to demold the molded foam plastic; specifically, the air input mechanism 5 includes an air compressor 51 and an air inlet pipe 52, the air inlet pipe 52 is connected to the mold cavity 14 through the steam inlet port 121, the air compressor 51 generates compressed air which enters the steam inlet port 121 through the air inlet pipe 52, and then is injected into the mold cavity 14 from the air inlet micropores 122, so that the gas is evenly distributed, making it easier for the molded foam plastic to be separated from the lower mold 12.

[0049] S7: Open the mold cavity 14, and take out the molded foam plastic by separating the upper mold 11 and the lower mold 12.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for manufacturing foam plastics using a foam plastic mold, Features: The steps include: S1: Start the vibrating base (3) to add raw material particles into the impurity removal box (2) for impurity removal; S2: preheating the mold (1) to raise the temperature of the mold (1) and the mold cavity (14) to a suitable temperature; S3: adding the raw material particles after the impurities are removed from the impurity removal box (2) into the mold cavity (14); S4: steam is input into the mold cavity (14) through the steam input mechanism (4), the raw material particles are foamed into a molded foam plastic, and the vibration base (3) stops working; S5: Cooling the mold (1) to separate the molded foam plastic from the inner wall of the mold cavity (14); S6: Inputting compressed air into the mold cavity (14) through the air input mechanism (5) to demould the molded foam plastic; S7: Open the mold cavity (14) and take out the molded foam plastic.

2. A method for manufacturing foam plastics using a foam plastic mold according to claim 1, Features: In step S2, the mold (1) comprises an upper mold (11), a lower mold (12) and a mold core (13); the lower mold (12) is fixedly connected to the vibration base (3); a mold cavity (14) is formed between the upper mold (11) and the lower mold (12); the mold core (13) is arranged in the mold cavity (14); the upper mold (11) is provided with a feed port (111) connecting the mold cavity (14) and the impurity removal box (2); and the lower mold (12) is provided with a steam input port (121) connected to the mold cavity (14).

3. A method for manufacturing foam plastics using a foam plastic mold according to claim 2, Features: The lower mold (12) and the mold core (13) are both provided with a plurality of air inlet micropores (122), and the steam input port (121) is connected to the mold cavity (14) through the air inlet micropores (122).

4. A method for manufacturing foam plastics using a foam plastic mold according to claim 2, Features: The upper mold (11) and the lower mold (12) are both provided with an annular flow channel (112) for passing heating water or cooling water.

5. A method for manufacturing foam plastics using a foam plastic mold according to claim 2, Features: In the step S1, a rotating motor (21) and a rotating platform (22) are arranged in the impurity removal box (2), the rotating platform (22) is fixedly connected to the output shaft of the rotating motor (21), a limiting frame (23) surrounding the circumference of the rotating platform (22) is fixedly connected in the impurity removal box (2), a negative pressure impurity remover (24) is arranged above the rotating platform (22), the negative pressure impurity remover (24) is connected to an air pump (26) via a first air pipe (25), a feeding port (27) for adding raw material particles to the rotating platform (22) is provided on the impurity removal box (2), and a feeding channel (28) connected to the feeding port (111) is provided below the rotating platform (22).

6. A method for manufacturing foam plastics using a foam plastic mold according to claim 5, Features: In step S3, the steam input mechanism (4) includes a steam generator (41), a pressure sensor (42), a temperature sensor (43), an input pipe (44) and a heat treatment box (45); one end of the input pipe (44) is connected to the steam generator (41), and the other end is connected to the mold cavity (14) through the steam input port (121); the heat treatment box (45) is arranged on the input pipe (44) to perform heat treatment on the steam; the pressure sensor (42) and the temperature sensor (43) are both arranged at the input end of the input pipe (44); the pressure sensor (42) is connected to the steam generator (41) to adjust the steam pressure; and the temperature sensor (43) is connected to the heat treatment box (45) to control the opening and closing of the heat treatment box (45).

7. A method for manufacturing foam plastics using a foam plastic mold according to claim 6, Features: An annular sealing ring (15) is provided between the upper mold (11) and the lower mold (12); one end of the annular sealing ring (15) is connected to the input pipe (44); and the input pipe (44) is connected to the steam input port (121) through the other end of the annular sealing ring (15).

8. A method for manufacturing foam plastics using a foam plastic mold according to claim 6, Features: The input pipeline (44) is in communication with the first air pipe (25), and a diverter valve (29) is provided at the connection of the first air pipe (25). A mixing mechanism (46) for mixing air flow and steam is provided on the input pipeline (44).

9. A method for manufacturing foam plastics using a foam plastic mold according to claim 8, Features: The mixing mechanism (46) comprises a flow diversion pipe (461), a flow focusing box (462) and a fan blade (463). Both ends of the flow diversion pipe (461) are connected to the flow focusing box (462). Two fan blades (463) are provided and are both rotatably connected to the flow focusing box (462). The airflow mixed with steam in the input pipe (44) enters the flow diversion pipe (461) for diversion and is gathered in the flow focusing box (462). The airflow drives the corresponding fan blade (463) to rotate to achieve mixing of the airflow and steam. The airflow and steam in the flow focusing box (462) flow into the input pipe (44).

10. A method for manufacturing foam plastics using a foam plastic mold according to claim 6, Features: The heat treatment box (45) comprises a plurality of sub-treatment boxes (451), each of which is electrically connected to the temperature sensor (43), and the temperature sensor (43) controls the opening and closing of the sub-treatment box (451) according to temperature monitoring.

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