Rice milling device with air pumping device for rice flour processing

Abstract

The invention provides a rice milling device containing an air pumping device for rice flour processing, and belongs to the technical field of rice milling devices.The rice milling device comprises a rotationally-arranged pulverizing barrel, a rice milling discharging bin is fixedly installed on one side of the pulverizing barrel, and a lifting supporting seat is further installed on the side, away from the rice milling discharging bin, of the pulverizing barrel; the steam conveying valve is communicated with an external high-pressure steam generator through a pipeline, and a feeding steam exhaust port is further formed in one side of the pulverization barrel. Rice grains absorbing water are dried again and then ground, the rice grains can be easily promoted by the rice milling roller to form pulverized particles, the milling pressure of the rice milling roller is greatly reduced by means of the milling mode, and the rice milling efficiency is improved. And meanwhile, an anti-blocking mechanism is further arranged in the device, so that the grinding efficiency is guaranteed, and the device is suitable for being widely popularized.

Description

[0001] This application is a divisional application of application number 202410159694.7, filed on February 4, 2024, with the invention title "A rice milling device for rice noodle processing and its usage method". Technical Field

[0002] This invention relates to the field of rice milling equipment technology, specifically to a rice milling device for rice flour processing containing an air pump. Background Technology

[0003] A rice milling machine with the prior art publication number "CN113578421A" that can select a specific rice milling device includes a controller, a frame, a motor, and a motor adjustment frame for fixing and adjusting the motor. A first rice milling device located on the front side and a second rice milling device located on the back side are fixedly installed on the top of the frame. A common rice outlet is provided at the left end of the first and second rice milling devices. An air guide pipe is installed below the first and second rice milling devices, and a fan is connected to the bottom end of the air guide pipe. The air inlet of the fan is connected to the first and second rice milling devices, and a bran outlet is installed at the air outlet of the fan. The two first and second rice milling devices are respectively connected to a first pulley and a second pulley via rotating shafts. By setting two rice milling devices, different types of rice can be produced, and the corresponding rice milling device can be selected for processing different types of paddy.

[0004] However, the rice milling machine that can select a specific rice milling device still has some obvious defects in use: the rice milling device and the rice milling machine commonly used in the prior art directly grind the threshed rice grains. Since the threshed rice grains are hard, they will cause great damage to the grinding disc during long-term grinding. At the same time, the above-mentioned device and the grinding device in the prior art are prone to clogging of the sieve holes during the grinding process, thus affecting the grinding efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a rice milling device for rice flour processing containing a pumping device, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A rice milling device for rice flour processing, including a pumping unit, comprises a rotating pulverizing cylinder. A rice milling feed chamber is fixedly installed on one side of the pulverizing cylinder, and a lifting support is installed on the side of the pulverizing cylinder away from the rice milling feed chamber. The pulverizing cylinder is positioned horizontally or inclined towards the rice milling feed chamber under the drive of the lifting support. The pulverizing cylinder and the rice milling feed chamber are connected by a transition channel. A stirring rod is movably installed inside the pulverizing cylinder. The stirring shaft of the stirring rod extends out of the pulverizing cylinder and is fixedly connected to the drive shaft of a stirring motor. A heating and drying device is installed inside the stirring rod. A steam delivery valve is installed on one side of the pulverizing cylinder and is connected to an external high-pressure steam generator through a pipe. A feeding and venting port is also opened on one side of the pulverizing cylinder.

[0008] The rice milling feed chamber is equipped with a rice milling roller, which is movably connected to the pulverizing cylinder through a sealed bearing sleeve. A feed channel is opened in the middle of the rice milling roller, and a feed impeller is movably installed in the feed channel. The grinding surface of the rice milling roller is arranged opposite to the screening disc, and a feed hole is opened on the screening disc. The screening disc and the feed impeller are both fixedly connected to the drive shaft of the feed motor through a connecting rod shaft. The rice milling roller and the screening disc are movably installed in the feed housing. A grinding motor that drives the rice milling roller to rotate is also installed in the feed housing. The material is ground and pulverized during the rotation of the rice milling roller and the screening disc.

[0009] The rice milling roller is also provided with several airflow pulse holes on the side that abuts against the screening disc. These airflow pulse holes are connected to a pumping device, which pumps high-pressure gas into the airflow pulse holes, thereby keeping the several discharge holes of the screening disc unobstructed by the high-pressure airflow.

[0010] Preferably, the heating and drying device is a heating wire arranged inside the stirring rod, and the heating wire is connected to an external power supply device.

[0011] Preferably, both the feeding motor and the grinding motor are fixedly installed inside the feeding housing, and the rice milling roller is equipped with a driven grinding gear located outside the feeding channel. The driven grinding gear meshes with the active grinding wheel fixedly installed on the drive shaft of the grinding motor.

[0012] Preferably, the pumping device includes a pumping cylinder body, in which a one-way intake piston is vertically mounted. The one-way intake piston is fixedly connected to a rack and pinion lifting rod, which is movably engaged with a shaped lifting gear. A driven helical gear is also fixedly mounted on the axle of the shaped lifting gear, and the driven helical gear is engaged with a driving helical gear. The driving helical gear is fixedly mounted on the outside of the rice milling roller. The pumping cylinder body is connected to a sliding pumping block through a one-way pumping pipe. The sliding pumping block is movably disposed in an annular groove on the side of the rice milling roller away from the sieve disc. A confluence hole communicating with several airflow pulse holes is provided in the annular groove. When the shaped lifting gear disengages from the rack and pinion lifting rod, the one-way intake piston no longer rises with the rotation of the rice milling roller. At this time, when the sliding pumping block engages with the confluence hole, the one-way intake piston moves downward under the action of a compression spring installed in the pumping cylinder body and discharges the gas in the pumping cylinder body from the airflow pulse holes.

[0013] Preferably, a sealing plate is telescopically installed in the transition channel. The sealing plate is mounted on a telescopic drive rod, which is fixedly installed on the bottom of the pulverizing cylinder near the transition channel. The telescopic drive rod synchronously drives the sealing plate to telescopically move, thereby controlling the opening and closing of the transition channel through the telescopic movement of the sealing plate.

[0014] A method of using the rice milling device for rice noodle processing described above includes the following steps:

[0015] Step 1: Feed a fixed amount of material into the pulverizing cylinder through the feeding and venting port, and then seal the feeding and venting port;

[0016] Step 2: Release high-pressure steam into the pulverizing cylinder through an external high-pressure steam generator, and start the stirring rod to stir the material in the pulverizing cylinder, so as to promote the absorption of steam moisture.

[0017] Step 3: Stir the material for 20-40 minutes. When the temperature of the material inside the pulverizing cylinder reaches 40-60℃ and the pressure inside the pulverizing cylinder reaches 20-50MPa, let it stand for 10 minutes to promote the absorption of moisture by the material.

[0018] Step 4: Close the steam delivery valve, open the closed feeding and venting port, start the heating and drying device, and continuously stir with the stirring rod for 15-30 minutes to promote the drying and pulverization of the material.

[0019] Step 5: Turn on the feeding motor and the grinding motor. The pulverized material reaches the gap between the rice milling roller and the sieve disc through the transition channel. As the rice milling roller and the sieve disc rotate, the material is ground. The powder that meets the particle size requirements falls from the feeding shell through the feeding hole on the sieve disc. In order to prevent the powder from clogging the feeding hole, the air pumping device regularly pumps high-pressure gas to increase the air pressure in the gap between the sieve disc and the rice milling roller, thereby clearing the feeding hole.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention uses steam pressure to induce the rice grains to absorb moisture before milling. After the rice grains absorb moisture and are dried again, numerous micro-cracks form inside the grains, causing them to change from a hard state to a powdery state. At this point, the rice milling roller can easily induce the rice grains to form powdery particles. This milling method greatly reduces the milling pressure on the rice milling roller and effectively extends its service life. At the same time, the device is also equipped with an anti-clogging mechanism to ensure milling efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the overall and partially enlarged structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the one-way intake piston lifting device of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the rice milling roller and screening disc of the present invention;

[0025] Figure 4 This is a schematic diagram showing the location of the manifold opening in this invention;

[0026] Figure 5 This is a three-dimensional schematic diagram of the overall structure of the pulverizing cylinder of the present invention;

[0027] Figure 6 This is a magnified structural diagram of region A of the present invention.

[0028] In the diagram: 1. Powdering cylinder, 2. Rice milling feed chamber, 3. Lifting support seat, 4. Transition channel, 5. Stirring connecting rod, 6. Steam conveying valve, 7. Feeding and exhaust port, 8. Rice milling roller, 9. Sealed bearing sleeve, 10. Feeding channel, 11. Feeding impeller, 12. Screening disc, 13. Feeding hole, 14. Connecting rod shaft, 15. Feeding motor, 16. Feeding housing, 17. Milling motor, 18. Airflow pulse hole, 19. Heating wire, 20. Driven milling gear, 21. Driven milling wheel, 22. Pump cylinder body, 23. One-way air intake piston, 24. Rack and pinion lifting rod, 25. Special-shaped lifting gear, 26. Driven helical gear, 27. Driven helical gear, 28. One-way pumping pipe, 29. Sliding pumping block, 30. Annular groove, 31. Compression spring, 32. Sealing plate, 33. Telescopic drive rod, 34. Manifold. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-6 The present invention provides a technical solution:

[0031] Example 1:

[0032] A rice milling device for rice noodle processing includes a rotating pulverizing cylinder 1. A rice milling feed chamber 2 is fixedly installed on one side of the pulverizing cylinder 1. A lifting support seat 3 is also installed on the side of the pulverizing cylinder 1 away from the rice milling feed chamber 2. The pulverizing cylinder 1 is horizontal or inclined to the side of the rice milling feed chamber 2 under the drive of the lifting support seat 3. The pulverizing cylinder 1 and the rice milling feed chamber 2 are connected by a transition channel 4. A stirring rod 5 is also movably installed inside the pulverizing cylinder 1. The stirring shaft of the stirring rod 5 extends out of the pulverizing cylinder 1 and is fixedly connected to the drive shaft of the stirring motor. A heating and drying device is installed inside the stirring rod 5. A steam delivery valve 6 is also installed on one side of the pulverizing cylinder 1. The steam delivery valve 6 is connected to an external high-pressure steam generator through a pipe. A feeding and venting port 7 is also opened on one side of the pulverizing cylinder 1.

[0033] A rice milling roller 8 is installed in the rice milling feed chamber 2. The rice milling roller 8 is movably connected to the pulverizing cylinder 1 through a sealed bearing sleeve 9. A feed channel 10 is opened in the middle of the rice milling roller 8. A feed impeller 11 is movably installed in the feed channel 10. The grinding surface of the rice milling roller 8 is opposite to the screening disc 12. A feed hole 13 is opened on the screening disc 12. The screening disc 12 and the feed impeller 11 are both fixedly connected to the drive shaft of the feed motor 15 through a connecting rod shaft 14. The rice milling roller 8 and the screening disc 12 are movably installed in the feed housing 16. A grinding motor 17 that drives the rice milling roller 8 to rotate is also installed in the feed housing 16. The material is ground and pulverized during the rotation of the rice milling roller 8 and the screening disc 12.

[0034] The rice milling roller 8 and the screening disc 12 are also provided with a number of airflow pulse holes 18 on one side. The number of airflow pulse holes 18 are connected to the air pumping device. The air pumping device pumps high-pressure gas into the airflow pulse holes 18, thereby keeping the number of discharge holes 13 of the screening disc 12 unobstructed by the high-pressure airflow.

[0035] In this embodiment, the pulverizing cylinder 1 serves as the rice grain carrying mechanism. Material is fed into the cylinder through the feeding and venting port 7. The material inside the pulverizing cylinder 1 is pressurized by steam via the steam conveying valve 6. Since rice grains are naturally absorbent and water vapor has a small particle size, it facilitates water absorption. Furthermore, the pressurized environment further promotes water absorption. To ensure uniform water absorption, a stirring rod 5 is installed inside the pulverizing cylinder 1 to uniformly stir the rice grains. During water absorption, the pulverizing cylinder 1 rotates, causing the rice milling feed chamber 2 to face upwards. The rotation of the pulverizing cylinder 1 is controlled by a valve installed on both sides of the pulverizing cylinder 1. The side-mounted rotating shaft enables the rice grains to absorb water. After the rice grains have finished absorbing water, the feeding and venting port 7 is opened to heat and dehumidify the pulverizing cylinder 1. Moisture is discharged through the feeding and venting port 7. Analysis shows that when dry rice grains absorb water, the water penetrates into the grain, increasing the internal moisture content. Due to the presence of moisture, the internal pressure of the rice grain increases, while the outer surface remains dry. This difference in internal and external moisture content leads to inconsistent physical properties between the inside and outside of the rice grain. When such moist rice grains undergo a drying process again, the water gradually evaporates, reducing the internal moisture content. Due to this difference in internal and external moisture content, the rice... The internal shrinkage rate of the rice grain may differ from that of the external surface. This inconsistent shrinkage can cause stress within the grain, while the external surface cannot keep up with the internal shrinkage. When the internal stress exceeds the grain's tolerance, microcracks will appear on the surface. These microcracks may further expand, leading to pulverization of the grain surface. In experiments, rice grains treated under the same conditions showed visible pulverization, and could be easily broken down by hand. At this point, the rice grains transitioned from a hard state to a more easily disintegrated pulverized state. The rice grains have completed the pre-grinding preparation process. Now, the transition channel 4 is opened, and the rice grains pass through the feed channel under gravity. The rice flour enters the grinding surface opposite to the rice milling roller 8 and the sieve disc 12. During the rotation of the rice milling roller 8 and the sieve disc 12, it is crushed into powder. The pressurized pulverization operation in this embodiment greatly reduces the viscosity difficulty, effectively protects the rice milling roller 8 and the sieve disc 12, and slows down their wear process. At the same time, in order to prevent rice flour from clogging the feed hole 13 of the sieve disc 12 and keep it unobstructed, this embodiment also provides a pumping device that regularly pumps high-pressure gas into the grinding gap between the rice milling roller 8 and the sieve disc 12. The pumping device promotes the clogging of rice flour through the feed hole 13, thereby effectively solving the clogging problem of the existing grinding device and ensuring the smooth grinding of rice flour.

[0036] Example 2:

[0037] The heating and drying device consists of heating wires 19 arranged within the stirring rod 5, and the heating wires 19 are connected to an external power supply device.

[0038] In this embodiment, a heating wire 19 is provided inside the stirring rod 5. The heat generated by the heating wire 19 is used to dry and heat the rice grains inside the pulverizing cylinder 1. Heating gas can also be supplied to the pulverizing cylinder 1 by means of an external hot air blower, thereby removing the moisture absorbed by the surface and inside of the rice grains.

[0039] Example 3:

[0040] The feeding motor 15 and the grinding motor 17 are both fixedly installed inside the feeding housing 16. The rice milling roller 8 is located outside the feeding channel 10 and is equipped with a driven grinding gear 20. The driven grinding gear 20 meshes with the active grinding wheel 21 fixedly installed on the drive shaft of the grinding motor 17.

[0041] The air pumping device includes an air pumping cylinder body 22, within which a one-way air intake piston 23 is mounted in a lifting manner. The one-way air intake piston 23 is fixedly connected to a rack and pinion lifting rod 24, which meshes movably with a special-shaped lifting gear 25. A driven helical gear 26 is also fixedly mounted on the axle of the special-shaped lifting gear 25, meshing with a driving helical gear 27. The driving helical gear 27 is fixedly mounted on the outside of the rice milling roller 8. The air pumping cylinder body 22 is connected to a sliding air pump block 29 via a one-way air pumping pipe 28. The sliding air pump block 29 is movably mounted... The annular groove 30, located on the side of the rice milling roller 8 away from the sieve plate 12, is provided with a confluence hole 34 that communicates with several airflow pulse holes 18. When the special-shaped lifting gear 25 disengages from the rack lifting rod 24, the one-way air intake piston 23 no longer rises with the rotation of the rice milling roller 8. At this time, when the sliding air pump block 29 cooperates with the confluence hole 34, the one-way air intake piston 23 moves downward under the action of the compression spring 31 installed in the air pump cylinder 22 and discharges the gas in the air pump cylinder 22 from the airflow pulse holes 18.

[0042] In this embodiment, the specific structure of the air pumping device is further disclosed. Gas from the one-way intake piston 23 enters the air pumping cylinder 22 from the external environment in a one-way direction. Gas from the air pumping cylinder 22 then enters the manifold 34 in a one-way direction. During the rotation and grinding process of the rice milling roller 8, the driving helical gear 27 drives the driven helical gear 26 to rotate. The rotation of the driven helical gear 26 drives the shaped lifting gear 25 to rotate. The shaped lifting gear 25 has a gear portion and a toothless portion. When the gear portion meshes with the rack lifting rod 24, the rotation of the shaped lifting gear 25 drives the rack lifting rod 24 to rise. When the toothless portion disengages from the rack lifting rod 24, the rack lifting rod 24 stops rising. When the sliding air pump block... When the 29 is not engaged with the manifold 34, the gas cannot flow out of the pump cylinder 22. As the gear part of the special-shaped lifting gear 25 engages with the rack lifting rod 24 again, the rack lifting rod 24 continues to rise, thereby continuously pumping air into the pump cylinder 22. When the rack lifting rod 24 disengages from the special-shaped lifting gear 25 and the sliding pump block 29 engages with the manifold 34, the gas in the pump cylinder 22 will be quickly pumped out of the pump cylinder 22 under the action of the compression spring 31. The high-pressure gas causes the powder blocked in the discharge hole 13 to pass through the screening plate 12. By setting the rack lifting rod 24 to perform the pumping operation after every four cycles of lifting, the pumping operation is carried out in a regular manner.

[0043] Example 4:

[0044] A sealing plate 32 is telescopically installed inside the transition channel 4. The sealing plate 32 is mounted on the telescopic drive rod 33. The telescopic drive rod 33 is fixedly installed on the bottom of the pulverizing cylinder 1 near the transition channel 4. The telescopic drive rod 33 drives the sealing plate 32 to telescopically move by extending and retracting the rod body, thereby controlling the opening and closing of the transition channel 4 by the extension and retraction of the sealing plate 32.

[0045] In this embodiment, the transition channel 4 is sealed by the sealing plate 32, thereby ensuring the smooth pressurization inside the pulverizing cylinder 1.

[0046] A method of using the rice milling device for rice noodle processing described above includes the following steps:

[0047] Step 1: Feed a fixed amount of material into the pulverizing cylinder 1 through the feeding and venting port 7, and then seal the feeding and venting port 7;

[0048] Step 2: Release high-pressure steam into the pulverizing cylinder 1 through an external high-pressure steam generator, and start the stirring rod 5 to stir the material in the pulverizing cylinder 1, so as to promote the absorption of steam moisture.

[0049] Step 3: Stir the material for 20-40 minutes. When the material temperature inside the pulverizing cylinder 1 reaches 40-60℃ and the pressure inside the pulverizing cylinder 1 reaches 20-50MPa, let it stand for 10 minutes to promote the absorption of moisture by the material.

[0050] Step 4: Close the steam conveying valve 6, open the closed feeding and venting port 7, start the heating and drying device, and continuously stir with the stirring rod 5. The drying and stirring time is 15-30 minutes to promote the drying and pulverization of the material.

[0051] Step 5: Turn on the feeding motor 15 and the grinding motor 17. The pulverized material reaches the gap between the rice milling roller 8 and the sieve disc 12 through the transition channel 4. As the rice milling roller 8 and the sieve disc 12 rotate, they are ground. The powder that meets the particle size requirements falls from the feeding housing 16 through the feeding hole 13 on the sieve disc 12. In order to prevent the powder from clogging the feeding hole 13, the air pumping device regularly pumps high-pressure gas to increase the air pressure in the gap between the sieve disc 12 and the rice milling roller 8, thereby clearing the feeding hole 13.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rice milling device for processing rice flour, comprising a rotating pulverizing cylinder, characterized in that: A rice milling feed hopper is fixedly installed on one side of the pulverizing cylinder, and a lifting support seat is also installed on the side of the pulverizing cylinder away from the rice milling feed hopper. The pulverizing cylinder and the rice milling feed hopper are connected by a transition channel. A stirring rod is also movably installed inside the pulverizing cylinder. The stirring shaft of the stirring rod extends out of the pulverizing cylinder and is fixedly connected to the drive shaft of the stirring motor. A heating and drying device is installed inside the stirring rod. A steam delivery valve is also installed on one side of the pulverizing cylinder. The steam delivery valve is connected to an external high-pressure steam generator through a pipeline. A feeding and steam vent is also opened on one side of the pulverizing cylinder. Tilting shafts are also installed on both sides of the pulverizing cylinder to achieve rotation of the pulverizing cylinder. The rice milling feed chamber is equipped with a rice milling roller, which is movably connected to the pulverizing cylinder through a sealed bearing sleeve. A feed channel is opened in the middle of the rice milling roller, and a feed impeller is movably installed in the feed channel. The grinding surface of the rice milling roller is arranged opposite to the screening disc, and a feed hole is opened on the screening disc. The screening disc and the feed impeller are both fixedly connected to the drive shaft of the feed motor through a connecting rod shaft. The rice milling roller and the screening disc are movably installed in the feed housing. A grinding motor that drives the rice milling roller to rotate is also installed in the feed housing. The material is ground and pulverized during the rotation of the rice milling roller and the screening disc. The rice milling roller is also provided with a number of airflow pulse holes on the side that abuts against the sieve disc. The number of airflow pulse holes are connected to a pumping device. High-pressure gas is pumped into the airflow pulse holes through the pumping device, thereby keeping the number of discharge holes of the sieve disc unobstructed by the high-pressure airflow. The pumping device includes a pumping cylinder body, in which a one-way air intake piston is installed. The one-way air intake piston is fixedly connected to a rack and pinion lifting rod, which is movably engaged with a special-shaped lifting gear. A driven helical gear is also fixedly installed on the axle of the special-shaped lifting gear, and the driven helical gear is engaged with a driving helical gear. The driving helical gear is fixedly installed on the outside of the rice milling roller. The pumping cylinder body is connected to a sliding pumping block through a one-way pumping pipe. The sliding pumping block is movably disposed in an annular groove on the side of the rice milling roller away from the sieve disc. A confluence hole communicating with several airflow pulse holes is opened in the annular groove. When the special-shaped lifting gear disengages from the rack and pinion lifting rod, the one-way air intake piston no longer rises with the rotation of the rice milling roller. At this time, when the sliding pumping block engages with the confluence hole, the one-way air intake piston moves downward under the action of a compression spring installed in the pumping cylinder body and discharges the gas in the pumping cylinder body from the airflow pulse holes.

2. The rice milling device for rice flour processing containing a pumping device according to claim 1, characterized in that: The heating and drying device consists of heating wires arranged inside the stirring rod, and the heating wires are connected to an external power supply device.

3. The rice milling device for rice flour processing containing a pumping device according to claim 1, characterized in that: Both the feeding motor and the grinding motor are fixedly installed inside the feeding housing. The rice milling roller is equipped with a driven grinding gear on the outside of the feeding channel. The driven grinding gear meshes with the active grinding wheel fixedly installed on the drive shaft of the grinding motor.

4. A rice milling device for rice flour processing containing a pumping device according to any one of claims 1-3, characterized in that: A sealing plate is telescopically installed inside the transition channel. The sealing plate is mounted on a telescopic drive rod, which is fixedly installed at the bottom of the pulverizing cylinder near the transition channel. The telescopic drive rod extends and retracts synchronously, driving the sealing plate to extend and retract, thereby controlling the opening and closing of the transition channel.

5. A method of use for a rice milling apparatus for rice flour processing containing a pumping device as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Feed a fixed amount of material into the pulverizing cylinder through the feeding and venting port, and then seal the feeding and venting port; Step 2: Release high-pressure steam into the pulverizing cylinder through an external high-pressure steam generator, and start the stirring rod to stir the material in the pulverizing cylinder, so as to promote the absorption of steam moisture. Step 3: Stir the material for 20-40 minutes. When the temperature of the material inside the pulverizing cylinder reaches 40-60℃ and the pressure inside the pulverizing cylinder reaches 20-50MPa, let it stand for 10 minutes to promote the absorption of moisture by the material. Step 4: Close the steam delivery valve, open the closed feeding and venting port, start the heating and drying device, and continuously stir with the stirring rod for 15-30 minutes to promote the drying and pulverization of the material. Step 5: Turn on the feeding motor and the grinding motor. The pulverized material reaches the gap between the rice milling roller and the sieve disc through the transition channel. As the rice milling roller and the sieve disc rotate, the material is ground. The powder that meets the particle size requirements falls from the feeding shell through the feeding hole on the sieve disc. In order to prevent the powder from clogging the feeding hole, the air pumping device regularly pumps high-pressure gas to increase the air pressure in the gap between the sieve disc and the rice milling roller, thereby clearing the feeding hole.

Images