Pre-expanding machine and method of using the same

Abstract

The present invention discloses a pre-expanding machine and a method for using the same, comprising two or more pre-expanding barrels arranged in groups mounted on a bracket, a vacuum system for providing feed and regulating steam temperature for the pre-expanding barrels, a heating system for uniform heating installed at the bottom of the pre-expanding barrels, and a material guiding mechanism for facilitating material guiding. In this application, different pre-expanding barrels are used to process and produce EPS plastics with different density ratios, thereby reducing the space occupied by the equipment and making the factory layout more reasonable. On the one hand, it increases the production volume of the EPS foam produced, and at the same time facilitates the uniform provision of heating steam to the pre-expanding barrels, thereby improving heating efficiency. On the one hand, the steam collecting chamber directly provides steam to the pre-expanding barrels uniformly through the steam inlet slit opened on the top surface of the steam collecting chamber. On the other hand, the steam in the steam collecting chamber is connected to the steam inlet slit on the side wall of the material guide pipe and the steam inlet slit on the side wall of the discharge valve cylinder through the steam inlet slit on the side wall of the discharge valve cylinder, and finally enters the pre-expanding barrel through the steam inlet slit on the top of the discharge valve cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of EPS production, and in particular to a pre-expanding machine and a use method thereof. Background Art

[0002] Since conventional pre-expanders are single-cylinder, factories usually need to produce EPS foams of different densities at the same time, so they need to use multiple devices, or foam one density first and then another, which takes up a lot of space, or is not timely, and is not convenient for coordinating production and processing; conventional pre-expanders directly connect the pre-expander and the steam generator through pipes. Since condensed water will be generated when the equipment temperature is lower than 100 degrees, the pre-expander will be heated unevenly in some parts during processing, resulting in uneven EPS foaming ratio, and ultimately causing major problems with product quality; in addition, the temperature of conventional pre-expanders is not easy to control during use, and the steam temperature provided during use is high, resulting in high energy consumption, which is not in line with low-carbon and environmental protection. Summary of the Invention

[0003] The purpose of the present invention is to provide a pre-expander and a method of using the same, so as to solve the above-mentioned technical problems of conventional pre-expanders.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a pre-expanding machine, comprising a pre-expanding barrel group arranged on the same bracket and composed of two or more arranged groups, a feeding system for providing feed to the pre-expanding barrel group, a vacuum system for providing negative pressure to the pre-expanding barrel group and regulating the internal temperature thereof, a heating system installed at the bottom of the pre-expanding barrel for uniform heating, and a material guiding mechanism for facilitating the adjustment of material guiding.

[0006] Furthermore, the pre-barrel group includes a plurality of pre-barrels installed side by side on a support frame, and the feeding system includes a plurality of upper storage barrels for storing different types of materials respectively. The top of the upper storage barrel is connected to the material preparation system through a pipeline, and a feed hopper is provided at the bottom of the upper storage barrel. The feed hopper is sealed and connected to the feed port opened on the top of the pre-barrel through a pipeline. The upper storage barrel is connected to a vacuum system for providing negative pressure suction thereto through a pipeline, and an electric control valve is provided on the negative pressure pipeline.

[0007] Furthermore, the material preparation system includes a weighing storage barrel, a preparation barrel, a weighing barrel, and a feeding barrel which are sequentially connected from top to bottom and installed on a support frame, and a weighing sensor is provided in the weighing barrel.

[0008] Furthermore, the vacuum system includes a vacuum pump, a vacuum barrel, and vacuum tubes respectively connected to the upper storage barrel and the pre-fermentation barrel, and the vacuum tubes are respectively installed with electric control valves that are adjusted and controlled by a control box.

[0009] Furthermore, an observation window is provided on the side wall of the pre-expanding barrel, and a plurality of material level meters are provided on the side wall. A barrel exhaust pipe is connected to the top of each pre-expanding barrel, and the plurality of barrel exhaust pipes are respectively connected to the exhaust main pipe. A barrel fan for removing impurities and discharging materials is also provided on the top of the pre-expanding barrel, and a stirring blade driven by a stirring reduction motor is provided in the pre-expanding barrel.

[0010] Furthermore, the heating system includes an electric hot air blower for providing hot air to the pre-heating barrel and a circulating hot air duct for connecting the electric hot air blower and the pre-heating barrel, and a temperature control sensor is installed on the circulating hot air duct.

[0011] Furthermore, the heating system includes a steam collecting box fixed on a support frame and connected to the bottom of the pre-expansion barrel, a steam generator and a steam inlet pipe for providing hot steam to the steam collecting box, and a plurality of steam collecting chambers independently sealed and separated in the steam collecting box for providing steam to different pre-expansion barrels respectively. A steam inlet slit is opened on the steam collecting box and connected to different pre-expansion barrels respectively, and the size of the steam inlet slit is smaller than the particle size of EPS.

[0012] Furthermore, a discharge hole is provided on the steam collecting box, which passes through the thickness of the steam collecting box and is connected to the bottom of the pre-barrel. A material guiding mechanism is provided at the bottom of the steam collecting box. The material guiding mechanism is a discharge adjustment seat. The discharge adjustment seat includes a support plate fixed to the bottom of the steam collecting box through a guide rod, a telescopic cylinder fixed on the support plate, and a discharge valve cylinder provided at the retracted end of the telescopic cylinder, which is plugged into and adapted to the discharge hole. Air intake micropores are provided on the top surface and the outer peripheral side of the discharge valve cylinder, and the diameter of the air intake micropores is smaller than the particle size of the EPS.

[0013] Furthermore, a discharge valve is provided on the bottom side wall of the pre-barrel, and a sulfurization drying bed is provided below the discharge valve.

[0014] A method for using a pre-expander comprises the following steps:

[0015] a. Purge process:

[0016] First, close the feed hopper and steam inlet pipe, then use the barrel fan to provide positive air pressure for the pre-expansion barrel, and remove the impurities in the pre-expansion barrel along the barrel exhaust pipe and exhaust main pipe. At the same time, open the discharge valve at the bottom of the pre-expansion barrel to discharge the impurities from the bottom.

[0017] b. Feeding process:

[0018] Open the electric control valve of the pipeline connecting the vacuum pump and the upper storage barrel through the control box, and close the discharge valve at the bottom of the pre-barrel. After the vacuum pump generates negative pressure in the upper storage barrel, the raw materials weighed and proportioned in the preparation system are fed through the pipeline. Different feed pipes are used to provide different pre-barrels with materials of different proportions, and the scheduled feeding is completed in one go.

[0019] c. Steam intake process;

[0020] Open the steam inlet valve on the steam inlet pipe, and provide heating steam to the steam collecting box at the bottom of the pre-expansion barrel through the steam generator. On the one hand, the steam collecting box directly and evenly provides steam to the pre-expansion barrel through the steam inlet slit opened on the top surface of the steam collecting box. On the other hand, the steam in the steam collecting box is connected with the steam inlet slit on the side wall of the discharge through hole and the side wall of the discharge valve cylinder through the steam inlet slit, and finally enters the pre-expansion barrel through the steam inlet slit on the top of the discharge valve cylinder, thereby evenly providing heat to the pre-expansion barrel.

[0021] d. Pre-mixing process;

[0022] During the steam introduction process of the pre-heating barrel, the stirring reduction motor drives the stirring rod inside the pre-heating barrel to achieve uniform heating;

[0023] e. Temperature adjustment process;

[0024] When the temperature in the pre-expansion barrel is too high, the electric control valve connected to the vacuum pump is opened to adjust the steam temperature in the pre-expansion barrel. At the same time, a negative pressure state is provided to the pre-expansion barrel, so that the steam generator generates steam under negative pressure, thereby reducing the steam temperature and avoiding excessive local expansion of the EPS raw material due to uneven heating when the steam is overheated, thereby achieving energy saving.

[0025] f. Discharging process:

[0026] The upper connecting hole and the lower connecting hole of the sensor are installed on the material level meter, and the sensors are installed at two different heights to detect the EPS foaming ratio. When the predetermined conditions are reached, the valves on the steam generator and the steam inlet pipe are closed, and the telescopic cylinder is used to adjust the discharge valve cylinder to descend to open the material guide pipe. The product in the pre-expansion barrel is discharged through the material guide pipe by an air pump or a stirring motor, and finally a boiling drying process is carried out on a drying bed.

[0027] Compared with the prior art, the beneficial technical effects of the present invention are as follows: the present application realizes the use of different pre-expansion barrels 4 to process and produce EPS plastics with different proportions, thereby reducing the space occupied by the equipment and making the factory layout more reasonable;

[0028] In this embodiment, a steam inlet slit or a steam inlet hole connected to the bottom of the pre-expansion barrel is respectively provided on the top surface of the steam collecting chamber, and the gap width or diameter of the steam inlet slit or the steam inlet hole is smaller than the EPS particle size; thereby, on the one hand, it plays a role in filtering the produced EPS foaming, and at the same time facilitates the uniform provision of heating steam to the pre-expansion barrel, thereby improving the heating efficiency; in this application, on the one hand, the steam collecting chamber directly provides steam to the pre-expansion barrel uniformly through the steam inlet slit opened on the top surface of the steam collecting chamber, and on the other hand, the steam in the steam collecting chamber is connected with the steam inlet slit on the side wall of the material guide pipe and the steam inlet slit on the side wall of the discharge valve cylinder, and finally enters the pre-expansion barrel through the steam inlet slit on the top of the discharge valve cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the main body of the pre-expander of the present invention;

[0031] Figure 2 It is a schematic side view of the main body of the pre-expander of the present invention;

[0032] Figure 3 This is a schematic diagram of the main view of the pre-expander barrel in the pre-expander of the present invention;

[0033] Figure 4 Schematic diagram of the material preparation system structure in the pre-expander of the present invention;

[0034] Figure 5 Schematic diagram of the discharge valve cylinder structure in the pre-expander of the present invention;

[0035] Figure 6 It is a schematic diagram of the steam inlet and discharge structure of the discharge valve barrel in the pre-expeller of the present invention.

[0036] Description of reference numerals:

[0037] 1. Material preparation system; 1a. Weighing storage barrel; 1b. Preparation barrel; 1c. Weighing barrel; 1d. Feeding barrel; 2. Upper storage barrel; 2a. Feed hopper; 2b. Feed inlet; 3. Pre-barrel; 3a. Observation window; 3b. Level indicator; 4. Steam collecting box; 4a. Steam inlet slit; 4b. Discharge hole; 5. Discharge adjustment seat; 5a. Support plate; 5b. Guide rod; 5c. Telescopic cylinder; 5d. Discharge valve cylinder; 5e. Air inlet micropore; 6. Air pipe; 7. Sulfurization drying bed; 8. Barrel fan; 9. Exhaust main pipe; 9a. Barrel exhaust pipe; 10. Vacuum pump; 10a. Vacuum barrel; 11. Steam generator; 11a. Steam inlet pipe; 12. Control box; 13. Stirring reduction motor. DETAILED DESCRIPTION

[0038] See Figure 1This embodiment discloses a pre-expanding machine, comprising a pre-expanding barrel group fixedly mounted on a common support and composed of two or more arranged therein, a feeding system for feeding the pre-expanding barrel group, a vacuum system for providing negative pressure to the pre-expanding barrel group and regulating the internal temperature thereof, a heating system mounted on the bottom of the pre-expanding barrel for uniform heating, and a material guiding mechanism for facilitating the adjustment of material guiding;

[0039] Since conventional pre-expanders are single-cylinder, factories usually need to produce EPS foams with different ratios at the same time, so multiple devices are needed, which takes up a lot of space and is not convenient for coordinating production and processing;

[0040] In this embodiment, please refer to Figure 1 and Figure 2 , the pre-barrel group includes four pre-barrels 3 installed side by side on a support frame, the feeding system includes two upper storage barrels 2 for storing different types of materials respectively. In this embodiment, the upper storage barrels 2 are used to store raw materials for standby use; the top of the upper storage barrel 2 is connected to the preparation system 1 through a pipeline, and a feeding hopper 2a is installed at the bottom of the upper storage barrel 2. The feeding hopper 2a is sealed and connected to the feeding port 2b opened at the top of the pre-barrel 3 through a pipeline. In this embodiment, materials are fed into the pre-barrel 3 for dispensing through the feeding port 2b; the upper storage barrel 2 is connected to a vacuum system that provides negative pressure suction for it through a pipeline, and an electric control valve is installed on the negative pressure pipeline;

[0041] Therefore, this embodiment realizes the production of EPS plastics with different proportions by utilizing different pre-expansion barrels 4, thereby reducing the space occupied by the equipment and making the factory layout more reasonable. At the same time, different products are proportioned according to demand, thereby improving production and processing efficiency.

[0042] The material preparation system 1 includes a weighing storage barrel 1a, a preparation barrel 1b, a weighing barrel 1c, and a feeding barrel 1d, which are connected in sequence from top to bottom and installed on a support frame. A weighing sensor is provided in the weighing barrel 1c, wherein the weighing storage barrel 1a is used for storing raw materials before weighing, the preparation barrel 1b is used for preparing raw materials before weighing, the weighing barrel 1c weighs the raw materials entering it, and the feeding barrel 1d transports the weighed raw materials to the upper storage barrel 2 for storage.

[0043] The vacuum system includes a vacuum pump 10, a vacuum barrel 10a, and vacuum tubes respectively connected to the upper storage barrel 2 and the pre-fermentation barrel 3. Electric control valves that are adjusted and controlled by a control box 12 are installed on the vacuum tubes. In this embodiment, the vacuum pump 10 provides a negative pressure environment for all barrels through pipelines, and also uses negative pressure to feed materials.

[0044] In addition, the conventional pre-expander is directly connected to the steam generator through pipes, which causes uneven heating in the pre-expander during processing, resulting in uneven expansion ratio of EPS, which leads to major problems in product quality.

[0045] In a specific implementation, the heating system includes a steam collecting box 4 fixed on a support frame and connected to the bottom of the pre-expansion barrel 3, a steam generator 11 and a steam inlet pipe 11a for providing hot steam to the steam collecting box 4. Four steam collecting chambers for providing steam to four different pre-expansion barrels 3 are independently and sealed in the steam collecting box 4. Steam inlet slits 4a respectively connected to different pre-expansion barrels 3 are opened on the steam collecting box 4. The size of the steam inlet slits 4a is smaller than the particle size of EPS, thereby preventing materials from entering or clogging the steam inlet slits 4a, thereby ensuring that the pre-expansion barrel 3 is stably and evenly provided with reaction pre-expansion heating steam. Steam enters from the bottom of the pre-expansion barrel 3, thereby evenly providing heating steam to the pre-expansion barrel 3, improving heating efficiency, and thereby making the EPS foaming ratio uniform, thereby ensuring product quality.

[0046] In specific implementation, the heating system includes an electric hot air blower for providing hot air to the pre-expansion barrel 3 and a circulating hot air duct for connecting the electric hot air blower and the pre-expansion barrel 3. A temperature control sensor is installed on the circulating hot air duct. In this embodiment, the required reaction temperature is provided to the pre-expansion barrel 3 through another heat source.

[0047] Since the temperature of conventional pre-expanders is difficult to control during use, and the steam temperature provided by the pre-expanders during use increases energy consumption, it is not in line with low-carbon and environmental protection.

[0048] An observation window 3a is provided on the side wall of the pre-expanding barrel 3, and a plurality of level gauges 3b are provided on the side wall thereof, through which the material discharging situation inside the pre-expanding barrel 3 can be observed, wherein the material discharging rate of the pre-expanding barrel 3 can be timely controlled by the level gauge 3b, and the control and adjustment can be performed more quantitatively; a barrel exhaust pipe 9a is connected to the top of each pre-expanding barrel 3, and a plurality of the barrel exhaust pipes 9a are respectively connected to the exhaust main pipe 9, so that the pressure in the pre-expanding barrel 3 is discharged by using the barrel exhaust pipe 9a; a barrel fan 8 for removing impurities and discharging is also installed on the top of the pre-expanding barrel 3, and the barrel fan 8 is connected to the interior of the pre-expanding barrel 3 through the air pipe 6, and a stirring blade driven by a stirring reduction motor 13 is installed in the pre-expanding barrel 3, wherein the stirring reduction motor 13 is installed on the top of the pre-expanding barrel 3;

[0049] In this embodiment, the electric control valve of the pipeline connecting the vacuum pump 10 and the pre-expansion barrel 3 is opened, and a negative pressure state is provided to the pre-expansion barrel 3 at the same time, so that the steam generator 11 generates steam under a negative pressure state, thereby reducing the steam temperature and avoiding steam overheating, thereby making the EPS raw material foaming ratio more uniform.

[0050] A discharge hole 4b is provided on the steam collecting box 4, which passes through the thickness of the steam collecting box 4 and communicates with the bottom of the pre-barrel 3. A material guiding mechanism is installed at the bottom of the steam collecting box 4. The material guiding mechanism is a discharge adjustment seat 5. The discharge adjustment seat 5 includes a support plate 5a fixed to the bottom of the steam collecting box 4 through a guide rod 5b, a telescopic cylinder 5c fixed to the support plate 5a, and a discharge valve cylinder 5d is provided at the retracted end of the telescopic cylinder 5c, which is plugged into the discharge hole 4b. Air intake micropores 5e are provided on the top surface and outer peripheral side of the discharge valve cylinder 5d. The diameter of the air intake micropores 5e is smaller than the particle size of the EPS.

[0051] In this embodiment, see Figure 5 and Figure 6 The top surface of the steam collecting box 4 is provided with a steam inlet slit 4a or a steam inlet hole connected to the bottom of the pre-expansion barrel 3. The width or diameter of the steam inlet slit 4a or the steam inlet hole is smaller than the EPS particle size. This plays a role in filtering the produced EPS foam and facilitates the uniform supply of heating steam to the pre-expansion barrel 3, thereby improving the heating efficiency.

[0052] In this embodiment, on the one hand, the steam collecting chamber 3 directly and evenly provides steam to the pre-heating barrel 3 through the steam inlet slit opened on the top surface of the steam collecting box 4; on the other hand, the steam in the steam collecting box 4 is connected with the steam inlet slit on the side wall of the discharge hole 4b through the steam inlet slit, and finally enters the pre-heating barrel 3 through the steam inlet slit on the top of the discharge valve cylinder 5d. At the same time, the discharge valve cylinder 5d can be driven to seal and lift in the discharge hole 4b by adjusting the telescopic cylinder 5c, thereby serving as a discharge port.

[0053] In this embodiment, a discharge valve can be directly opened on the bottom side wall of the pre-barrel 3, and a vulcanization drying bed 7 is installed below the discharge valve for vulcanization, drying and conveying the raw materials after discharging.

[0054] This embodiment also discloses a method for using the pre-expander, which includes the following steps:

[0055] a. Purge process:

[0056] First, close the feed hopper and steam inlet pipe, then use the barrel fan to provide positive air pressure for the pre-expansion barrel, and remove the impurities in the pre-expansion barrel along the barrel exhaust pipe and exhaust main pipe. At the same time, open the discharge valve at the bottom of the pre-expansion barrel to discharge the impurities from the bottom.

[0057] b. Feeding process:

[0058] Open the electric control valve of the pipeline connecting the vacuum pump and the upper storage barrel through the control box, and close the discharge valve at the bottom of the pre-barrel. After the vacuum pump generates negative pressure in the upper storage barrel, the raw materials weighed and proportioned in the preparation system are fed through the pipeline. Different feed pipes are used to provide different pre-barrels with materials of different proportions, and the scheduled feeding is completed in one go.

[0059] c. Steam intake process;

[0060] Open the steam inlet valve on the steam inlet pipe, and provide heating steam to the steam collecting box at the bottom of the pre-expansion barrel through the steam generator. On the one hand, the steam collecting box directly and evenly provides steam to the pre-expansion barrel through the steam inlet slit opened on the top surface of the steam collecting box. On the other hand, the steam in the steam collecting box is connected with the steam inlet slit on the side wall of the discharge through hole and the side wall of the discharge valve cylinder through the steam inlet slit, and finally enters the pre-expansion barrel through the steam inlet slit on the top of the discharge valve cylinder, thereby evenly providing heat to the pre-expansion barrel.

[0061] d. Pre-mixing process;

[0062] During the steam introduction process of the pre-heating barrel, the stirring reduction motor drives the stirring rod inside the pre-heating barrel to achieve uniform heating;

[0063] e. Temperature adjustment process;

[0064] When the temperature in the pre-expansion barrel is too high, the electric control valve connected to the vacuum pump is opened to adjust the steam temperature in the pre-expansion barrel. At the same time, a negative pressure state is provided to the pre-expansion barrel, so that the steam generator generates steam under negative pressure, thereby reducing the steam temperature and avoiding excessive local expansion of the EPS raw material due to uneven heating when the steam is overheated, thereby achieving energy saving.

[0065] f. Discharging process:

[0066] The upper connecting hole and the lower connecting hole of the sensor are installed on the material level meter, and the sensors are installed at two different heights to detect the EPS foaming ratio. When the predetermined conditions are reached, the valves on the steam generator and the steam inlet pipe are closed, and the telescopic cylinder is used to adjust the discharge valve cylinder to descend to open the material guide pipe. The product in the pre-expansion barrel is discharged through the material guide pipe by an air pump or a stirring motor, and finally a boiling drying process is carried out on a drying bed.

[0067] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0068] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A pre-expander, characterized in that: The invention comprises a pre-expansion barrel group arranged on the same support and composed of two or more pre-expansion barrels, a feeding system for feeding the pre-expansion barrel group, a vacuum system for providing negative pressure to the pre-expansion barrel group and regulating the internal temperature thereof, a heating system installed at the bottom of the pre-expansion barrel for uniform heating, and a material guiding mechanism for facilitating the adjustment of material guiding; The heating system comprises a steam collecting box (4) fixed on a support frame and connected to the bottom of the pre-expansion barrel (3), a steam generator (11) and a steam inlet pipe (11a) for providing hot steam to the steam collecting box (4); a plurality of steam collecting chambers for providing steam to different pre-expansion barrels (3) are independently and sealedly separated in the steam collecting box (4); a steam inlet slit (4a) connected to different pre-expansion barrels (3) is provided on the steam collecting box (4); the size of the steam inlet slit (4a) is smaller than the particle size of EPS; A material discharge through hole (4b) is provided on the steam collecting box (4) and is connected to the bottom of the pre-heating barrel (3). A material guide mechanism is provided at the bottom of the steam collecting box (4). The material guide mechanism is a material discharge adjustment seat (5). The material discharge adjustment seat (5) includes a support plate (5a) fixed to the bottom of the steam collecting box (4) through a guide rod (5b), a telescopic cylinder (5c) fixed on the support plate (5a), and a material discharge valve cylinder (5d) is provided at the retracted end of the telescopic cylinder (5c) and is plugged into and adapted to the material discharge through hole (4b). Air intake micropores (5e) are provided on the top surface and the outer peripheral side of the material discharge valve cylinder (5d). The diameter of the air intake micropores (5e) is smaller than the particle size of the EPS.

2. The pre-expander according to claim 1, characterized in that: The pre-making barrel group includes a plurality of pre-making barrels (3) installed side by side on a support frame, and the feeding system includes a plurality of upper storage barrels (2) for storing different types of materials respectively. The top of the upper storage barrel (2) is connected to the material preparation system (1) through a pipeline, and a feed hopper (2a) is provided at the bottom of the upper storage barrel (2). The feed hopper (2a) is connected to the feed port (2b) opened on the top of the pre-making barrel (3) through a pipeline seal. A vacuum system for providing negative pressure suction to the upper storage barrel (2) is connected to the upper storage barrel (2) through a pipeline, and an electric control valve is provided on the negative pressure pipeline.

3. The pre-expanding machine according to claim 2, characterized in that: The material preparation system (1) comprises a weighing storage barrel (1a), a preparation barrel (1b), a weighing barrel (1c), and a feeding barrel (1d) which are sequentially connected from top to bottom and mounted on a support frame, wherein a weighing sensor is arranged in the weighing barrel (1c).

4. The pre-expanding machine according to claim 2, characterized in that: The vacuum system comprises a vacuum pump (10), a vacuum barrel (10a), and vacuum tubes respectively connected to the upper storage barrel (2) and the pre-fermentation barrel (3), wherein the vacuum tubes are respectively installed with electric control valves which are regulated and controlled by a control box (12).

5. The pre-expanding machine according to claim 1, characterized in that: An observation window (3a) is provided on the side wall of the pre-expanding barrel (3), and a plurality of material level gauges (3b) are provided on the side wall. A barrel exhaust pipe (9a) is connected to the top of each pre-expanding barrel (3), and the plurality of barrel exhaust pipes (9a) are respectively connected to the exhaust main pipe (9). A barrel fan (8) for removing impurities and discharging materials is also provided on the top of the pre-expanding barrel (3). A stirring blade driven by a stirring reduction motor (13) is provided in the pre-expanding barrel (3).

6. The pre-expander according to claim 5, characterized in that: The heating system comprises an electric hot air blower for providing hot air to the pre-expansion barrel (3) and a circulating hot air duct for connecting the electric hot air blower and the pre-expansion barrel (3), and a temperature control sensor is installed on the circulating hot air duct.

7. The pre-expander according to claim 1, characterized in that: A discharge valve is provided on the bottom side wall of the pre-fermentation barrel (3), and a vulcanization drying bed (7) is provided below the discharge valve.

8. The method for using the pre-expander according to claim 1, characterized in that: It includes the following steps: a. Purge process: First, close the feed hopper and steam inlet pipe, then use the barrel fan to provide positive air pressure for the pre-expansion barrel, remove the impurities in the pre-expansion barrel along the barrel exhaust pipe and exhaust main pipe, and at the same time open the discharge valve at the bottom of the pre-expansion barrel to discharge the impurities at the bottom; b. Feeding process: Open the electric control valve of the pipeline connecting the vacuum pump and the upper storage barrel through the control box, and close the discharge valve at the bottom of the pre-barrel. After the vacuum pump generates negative pressure in the upper storage barrel, the raw materials weighed and proportioned in the preparation system are fed through the pipeline. Different feed pipes are used to provide different proportions of materials to different pre-barrels, and the scheduled feeding is completed in one go. c. Steam intake process; Open the steam inlet valve on the steam inlet pipe, and provide heating steam to the steam collecting box at the bottom of the pre-expansion barrel through the steam generator. On the one hand, the steam collecting box directly and evenly provides steam to the pre-expansion barrel through the steam inlet slit opened on the top surface of the steam collecting box. On the other hand, the steam in the steam collecting box is connected with the steam inlet slit on the side wall of the discharge through hole and the side wall of the discharge valve cylinder through the steam inlet slit, and finally enters the pre-expansion barrel through the steam inlet slit on the top of the discharge valve cylinder, thereby evenly providing heat to the pre-expansion barrel. d. Pre-mixing process; During the steam introduction process of the pre-heating barrel, the stirring reduction motor drives the stirring rod inside the pre-heating barrel to achieve uniform heating; e. Temperature adjustment process; When the temperature in the pre-expansion barrel is too high, the electric control valve connected to the vacuum pump is opened to adjust the steam temperature in the pre-expansion barrel. At the same time, a negative pressure state is provided to the pre-expansion barrel, so that the steam generator generates steam under negative pressure, thereby reducing the steam temperature and avoiding excessive local expansion of the EPS raw material due to uneven heating when the steam is overheated, thereby achieving energy saving. f. Discharging process: The upper connecting hole and the lower connecting hole of the sensor are installed on the material level meter, and the sensors are installed at two different heights to detect the EPS foaming ratio. When the predetermined conditions are reached, the valves on the steam generator and the steam inlet pipe are closed, and the telescopic cylinder is used to adjust the discharge valve cylinder to descend to open the material guide pipe. The product in the pre-expansion barrel is discharged through the material guide pipe by an air pump or a stirring motor, and finally a boiling drying process is carried out on a drying bed.

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