Grinding device for improving particle size refinement degree of bean flour

Abstract

The invention relates to the technical field of soybean processing, in particular to a grinding device for improving the particle size refinement degree of soybean flour, which comprises a protective shell fixed on the ground, and a feed hopper with adjustable circulation is arranged at the top end of the protective shell; the material guide pipe is arranged in an inner cavity of the protective shell and communicates with an outlet of the feeding hopper, and a winnowing assembly used for sorting soybeans is arranged on the side wall of the material guide pipe; the grinding mechanism comprises a grinding cavity arranged between the fixed disc and the rotating disc, and the material guide pipe is communicated with the grinding cavity; the screening barrel and the rotating disc are coaxially arranged, a material returning barrel communicated with the material guiding pipe is arranged outside the screening barrel, the ground soybean powder is screened, the soybean powder meeting the requirement falls into the material storage bin, and the unqualified soybean powder is sent back into the material guiding pipe by the material returning barrel. The soybean grinding and smashing device is compact in structure and convenient to use, multi-stage grinding and smashing of soybeans are achieved, efficient and high-precision refining of soybean powder is achieved, meanwhile, raw material waste and operation complexity are reduced, and the diversified requirements of high-quality soybean powder production are met.

Description

Technical Field

[0001] The invention relates to the technical field of soybean processing, in particular to a grinding device for improving the particle size refinement of soybean powder. Background Art

[0002] Soy flour is a powdered product made from defatted soybeans. By crushing the defatted soybeans to a certain particle size and obtaining specific tiny particle components through air separation, defatted soybean flour with a high protein content can be obtained.

[0003] Existing soybean flour mills generally use a grinder to grind soybeans to obtain the required soybean flour; however, the existing grinding devices have a poor degree of refinement and can often only perform simple grinding of soybeans. After grinding, a large amount of large-particle soybean flour will remain, and the degree of refinement cannot meet the production needs of high-quality soybean flour; and although a small number of equipment have multi-stage grinding functions, and although some multi-stage grinding devices can reduce the presence of large-particle soybean flour, such devices usually require the soybean flour to be transferred multiple times, and the multi-stage grinding efficiency is low. At the same time, during the transfer process, some soybean flour will stick to the inner wall of the equipment, which not only causes waste of raw materials but also reduces the grinding efficiency; in addition, the existing grinding devices are complicated to operate when adjusting the grinding particle size, and the adjustment range is limited, which cannot meet the production needs of soybean flour with different particle sizes.

[0004] Therefore, the present invention discloses a grinding device for improving the particle size refinement of soybean powder to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a grinding device for improving the particle size refinement of soybean powder, so as to solve the problems existing in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides a grinding device for improving the particle size refinement of soybean powder, comprising:

[0007] A protective shell is fixed on the ground, and a feed hopper with adjustable flow rate is provided on the top of the protective shell;

[0008] A material guide pipe, the material guide pipe is arranged in the inner cavity of the protective shell and is connected to the outlet of the feed hopper, and the side wall of the material guide pipe is provided with an air separation component for sorting soybeans;

[0009] The grinding mechanism includes a fixed disk and a rotating disk coaxially arranged above and below, a grinding chamber is provided between the fixed disk and the rotating disk, and the bottom end of the material guide tube is fixedly connected to the top end of the fixed disk and communicates with the grinding chamber;

[0010] A screening cylinder is fixed in the protective shell and is coaxially arranged with the rotating disk. A return cylinder connected to the material guide pipe is provided outside the screening cylinder. The soybean powder ground in the grinding chamber is screened, and the soybean powder that meets the requirements falls into the storage bin in the protective shell. The unqualified soybean powder screened out is transported back to the material guide pipe by the return cylinder.

[0011] Preferably, a screening net is provided in the screening cylinder, the screening net surrounds the rotating disk and is rotatably connected to the rotating disk, the top surface of the screening net is lower than the bottom end of the grinding chamber, and the soybean powder ground in the grinding chamber falls onto the screening net for screening.

[0012] Preferably, the side wall of the screening cylinder is provided with a return material port corresponding to the return material cylinder, and the return material port is connected to the inner cavity of the screening cylinder; the return material port is located above the screening mesh, and the soybean powder remaining after screening by the screening mesh enters the return material cylinder through the return material port.

[0013] Preferably, a support platform is provided in the protective shell, the rotating disk is rotatably connected to the support platform, a powder outlet is opened through the support platform, the powder outlet is located between the screening cylinder and the rotating disk, and the sifted soybean powder enters the storage bin through the powder outlet.

[0014] Preferably, a plurality of rolling shafts are arranged at equal intervals around the outer wall of the rotating disk, and the end of the rolling shaft away from the rotating disk is slidingly connected to the inner wall of the screening drum; a rolling roller is rotatably connected to the rolling shaft, and the outer wall of the rolling roller rolls on the support platform.

[0015] Preferably, a plurality of first cleaning brushes and second cleaning brushes arranged vertically are fixedly connected to the outer wall of the fixed plate, the first cleaning brushes are in sliding contact with the top surface of the screening net, and the second cleaning brushes are in sliding contact with the top surface of the support platform.

[0016] Preferably, an adjustment cavity is provided on the protective shell, and an adjustment plate is slidably connected to the adjustment cavity. The adjustment plate extends out of the adjustment cavity and adjusts the outlet area of ​​the feed hopper, so as to facilitate the adjustment of the inflow of soybeans.

[0017] Preferably, the air separation component includes an air separation machine arranged in the protective shell, and the air outlet of the air separation machine is connected to the side wall of the material guide pipe through an air separation pipe; the side wall of the material guide pipe is connected to a slag discharge pipe opposite to the air separation pipe, and the slag discharge pipe extends out of the protective shell.

[0018] Preferably, a return motor is fixedly installed on the top of the return barrel, and the output end of the return motor extends into the return barrel and is transmission-connected to a screw conveyor rotatably connected inside the return barrel; the top of the return barrel is connected to the guide pipe through an inclined return pipe.

[0019] Preferably, a driving cavity is provided on the support platform, a driving motor is installed in the driving cavity, the output shaft of the driving motor is connected to the driving gear, the driving gear is meshed with the driven gear, and the driven gear is connected to the transmission shaft fixed to the bottom end of the rotating disk.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects: the present invention discloses a grinding device for improving the particle size refinement of soybean powder, the protective shell is fixed to the ground, and a feed hopper with adjustable flow rate is arranged on the top, which provides a closed space for the entire device and controls the raw material feeding rate, so as to better adapt to different production scales and processing requirements; the guide pipe is located in the inner cavity of the protective shell and is connected to the feed hopper outlet, and an air separation component is arranged on the side wall for preliminarily sorting the soybeans, removing light impurities or unqualified particles, ensuring the quality of soybeans entering the grinding mechanism, providing pure raw materials for the subsequent grinding process, improving the quality of the final soybean powder, and serving as a raw material conveying channel at the same time; the grinding mechanism includes a fixed disk and a rotating disk fixed coaxially above and below, and an efficient grinding chamber is formed between the two, so that the raw materials directly enter the grinding chamber, and the soybeans are strongly sheared and extruded and ground by the rotation of the rotating disk, and the soybeans are finely ground, which can effectively improve the particle size refinement of the soybean powder, meet the production needs of high-quality soybean powder, and reduce the number of large-particle soybean powder. The existence of the invention makes the particle size of the soybean powder more uniform and fine, thereby improving the quality and taste of the soybean powder; the screening cylinder is fixedly connected to the protective shell and is coaxially arranged with the rotating disk, and the external return cylinder is connected to the guide pipe. The soybean powder ground in the grinding chamber is screened in the screening cylinder, and the soybean powder that meets the particle size requirements falls into the storage bin, and the unqualified coarse particles return to the guide pipe through the return cylinder and re-enter the grinding chamber for secondary grinding, avoiding the waste of raw materials caused by unqualified particle size. The cooperation of the screening cylinder and the return cylinder realizes the closed-loop process of "grinding-screening-returning", and the unqualified coarse particles are directly returned to the guide pipe for re-grinding, avoiding the low efficiency and raw material wall adhesion problems caused by multiple transfers in traditional multi-stage grinding devices, significantly improving the particle size refinement of soybean powder, and meeting the production needs of high-quality soybean powder; the unqualified soybean powder screened out is directly returned to the guide pipe through the return cylinder without being transferred to other equipment, avoiding the loss of raw materials caused by soybean powder adhering to the inner wall of the equipment during the transfer process, reducing intermediate links, shortening the grinding cycle, and improving the overall grinding efficiency.

[0021] The invention has a compact structure and is easy to use, realizes multi-stage grinding and pulverizing of soybeans, and achieves efficient and high-precision refinement of soybean powder, while reducing raw material waste and operation complexity, and meeting the diversified needs of high-quality soybean powder production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 This is an axial view of a grinding device for improving the particle size refinement of soybean powder according to the present invention;

[0024] Figure 2 This is an axial view of the grinding mechanism of the present invention;

[0025] Figure 3 This is a schematic diagram of the main structure of a grinding device for improving the particle size refinement of soybean powder according to the present invention;

[0026] Figure 4 A schematic side view of the structure of a grinding device for improving the particle size refinement of soybean powder according to the present invention;

[0027] Figure 5 For the present invention Figure 3 A partial enlarged view of middle A;

[0028] Figure 6 Schematic diagram of the top view of the screening drum of the present invention;

[0029] In the figure: 1, protective shell; 2, guide tube; 3, grinding mechanism; 4, screening cylinder; 101, feed hopper; 102, support platform; 103, powder outlet; 104, storage bin; 105, adjustment plate; 106, adjustment chamber; 107, adjustment screw; 108, positioning groove; 109, positioning plate; 110, positioning spring; 111, adjustment knob; 112, adjustment screw hole; 201, air separator; 202, air separator tube; 203, air inlet; 204, interception net; 205, air outlet; 206, slag discharge pipe; 3 01. Fixed disk; 302. Rotating disk; 303. Grinding chamber; 304. Feeding hole; 305. Rough surface; 401. Return barrel; 402. Screening net; 403. Return port; 404. Rolling shaft; 405. Guide groove; 406. Rolling roller; 407. First cleaning brush; 408. Second cleaning brush; 409. Driving chamber; 410. Driving motor; 411. Driving gear; 412. Driven gear; 413. Transmission shaft; 414. Return motor; 415. Screw conveyor; 416. Return pipe. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figures 1 to 6As shown, this embodiment provides a grinding device for improving the particle size refinement of soybean powder, comprising: a protective shell 1, the protective shell 1 is fixed on the ground, and a feed hopper 101 with an adjustable flow rate is provided on the top of the protective shell 1; a guide pipe 2, the guide pipe 2 is provided in the inner cavity of the protective shell 1 and is connected to the outlet of the feed hopper 101, and a side wall of the guide pipe 2 is provided with an air separation component for sorting soybeans; a grinding mechanism 3, including a fixed disk 301 and a rotating disk 302 arranged coaxially above and below, and the fixed disk 301 and the rotating disk 302 are connected to each other. A grinding chamber 303 is provided between the disks 302, and the bottom end of the guide tube 2 is fixedly connected to the top of the fixed disk 301 and communicated with the grinding chamber 303; the screening cylinder 4 is fixedly connected in the protective shell 1 and is coaxially arranged with the rotating disk 302, and a return cylinder 401 communicated with the guide tube 2 is provided outside the screening cylinder 4. The soybean powder ground in the grinding chamber 303 is screened, and the soybean powder that meets the requirements falls into the storage bin 104 in the protective shell 1, and the unqualified soybean powder screened out is transported back to the guide tube 2 by the return cylinder 401.The present invention discloses a grinding device for improving the particle size refinement of soybean powder. The protective shell 1 is fixed to the ground, and a feed hopper 101 with adjustable flow rate is arranged on the top, which provides a closed space for the entire device and controls the feed rate of raw materials, so as to better adapt to different production scales and processing requirements; the guide pipe 2 is located in the inner cavity of the protective shell 1 and is connected to the outlet of the feed hopper 101. An air separation component is arranged on the side wall for preliminarily sorting soybeans, removing light impurities or unqualified particles, ensuring the quality of soybeans entering the grinding mechanism 3, providing pure raw materials for the subsequent grinding process, improving the quality of the final soybean powder, and serving as a raw material conveying channel; the grinding mechanism 3 includes a fixed disk 301 and a rotating disk 302 coaxially arranged above and below, and an efficient grinding chamber 303 is formed between the two, so that the raw materials directly enter the grinding chamber 303, and the soybeans are strongly sheared and extruded and ground by the rotation of the rotating disk 302, so as to be finely ground, which can effectively improve the particle size refinement of the soybean powder, meet the production requirements of high-quality soybean powder, reduce the presence of large-particle soybean powder, and make the particle size of the soybean powder more uniform and fine. The screening cylinder 4 is fixedly connected to the protective shell 1 and is coaxially arranged with the rotating disk 302. The external return cylinder 401 is connected with the guide pipe 2. The soybean powder ground in the grinding chamber 303 is screened in the screening cylinder 4. The soybean powder that meets the particle size requirements falls into the storage bin 104. The unqualified coarse particles return to the guide pipe 2 through the return cylinder 401 and re-enter the grinding chamber 303 for secondary grinding, thereby avoiding the waste of raw materials caused by unqualified particle size. The cooperation between the screening cylinder 4 and the return cylinder 401 realizes the "grinding- In the closed-loop process of "screening-returning", unqualified coarse particles are directly returned to the guide pipe 2 for re-grinding, avoiding the low efficiency and raw material wall adhesion problems caused by multiple transfers in traditional multi-stage grinding devices, significantly improving the particle size refinement of soybean powder, and meeting the production needs of high-quality soybean powder; the unqualified soybean powder screened out is directly returned to the guide pipe 2 through the return cylinder 401 without being transferred to other equipment, avoiding the loss of raw materials caused by soybean powder adhering to the inner wall of the equipment during the transfer process, reducing intermediate links, shortening the grinding cycle, and improving the overall grinding efficiency. The present invention has a compact structure and is easy to use, realizes multi-stage grinding and pulverization of soybeans, achieves efficient and high-precision refinement of soybean powder, while reducing raw material waste and operation complexity, and meets the diversified needs of high-quality soybean powder production.

[0033] In one embodiment of the present invention, a feed hole 304 is provided on the fixed disk 301 to connect the material guide pipe 2 and the grinding chamber 303 to achieve the conduction of soybeans.

[0034] In one embodiment of the present invention, the bottom surface of the fixed disk 301 and the top surface of the rotating disk 302 are both roughened, so that a rough surface 305 is formed in the grinding chamber 303, thereby improving the grinding effect of the soybeans.

[0035] A further optimization scheme includes a screening mesh 402 disposed within screening drum 4. Screening mesh 402 surrounds and is rotatably connected to rotating disk 302. The top surface of screening mesh 402 is lower than the bottom of grinding chamber 303. The soybean powder ground in grinding chamber 303 falls onto screening mesh 402 for screening. The provision of screening mesh 402 effectively screens the ground soybean powder, separating powder that meets particle size requirements from unqualified powder. This ensures that the resulting powder particle size meets high-quality requirements, further enhancing the mill's refined production capabilities and improving the quality of the powder.

[0036] In one embodiment of the present invention, the sieve mesh 402 can be replaced with a sieve mesh 402 of different apertures as needed, thereby adjusting the fineness of the obtained soybean powder.

[0037] In a further optimization, a return port 403 is provided on the sidewall of screening drum 4, corresponding to return drum 401. Return port 403 communicates with the inner cavity of screening drum 4. Return port 403 is located above screening mesh 402. Soybean powder remaining after screening by mesh 402 enters return drum 401 through return port 403. Unqualified soybean powder after screening can smoothly pass through return port 403 into return drum 401 and is then transported back to guide tube 2 for re-grinding. This avoids the waste of unqualified soybean powder, improves raw material utilization, and ensures the continuity of the entire grinding process, further enhancing grinding efficiency.

[0038] In a further optimized solution, a support platform 102 is provided within the protective shell 1, and the rotating disk 302 is rotatably connected to the support platform 102. A powder outlet 103 is provided through the support platform 102, and the powder outlet 103 is located between the screening drum 4 and the rotating disk 302. The sifted soybean powder enters the storage bin 104 through the powder outlet 103. The support platform 102 provides a stable support and rotation base for the rotating disk 302. The setting of the powder outlet 103 allows the qualified soybean powder after screening to smoothly enter the storage bin 104 from the area between the screening drum 4 and the rotating disk 302, realizing the orderly collection and storage of soybean powder, further optimizing the structure and function of the grinding device, and improving the operating efficiency and reliability of the entire device.

[0039] Further optimization scheme, the outer wall of the rotating disc 302 is circumferentially equidistantly provided with a plurality of rolling shafts 404, and the rolling shafts 404 are slidably connected to the inner wall of the screening cylinder 4. A rolling roller 406 is rotatably connected to the rolling shaft 404, and the outer wall of the rolling roller 406 rolls on the support table 102. The rolling shaft 404 and the rolling roller 406 are arranged, and during the rotation of the rotating disc 302, the rolling roller 406 can further roll and grind the soybean powder in the cavity of the screening cylinder 4, increase the grinding intensity and effect, make the particle size of the soybean powder more refined, and further improve the grinding quality of the grinding device, better meet the production demand of high-quality soybean powder.

[0040] In an embodiment of the present application, the inner wall of the screening cylinder 4 is provided with a guide groove 405 corresponding to the rolling shaft 404, which realizes the guidance and stability of the rolling shaft 404.

[0041] Further optimization scheme, the outer wall of the fixed disc 301 is fixedly connected with a plurality of first cleaning brushes 407 and second cleaning brushes 408 arranged in an up-down manner, the first cleaning brushes 407 are in sliding contact with the top surface of the screening mesh 402, and the second cleaning brushes 408 are in sliding contact with the top surface of the support table 102. The first cleaning brush 407 and the second cleaning brush 408 do not need additional power, but move with the rotation of the rotating disc 302. The first cleaning brush 407 can clean the soybean powder remaining on the top surface of the screening mesh 402 in time, prevent the screening mesh 402 from being blocked, ensure the stability of the screening effect, and accelerate the screening efficiency of the soybean powder. The second cleaning brush 408 can clean the soybean powder on the top surface of the support table 102 and sweep the soybean powder into the powder outlet 103, so as to avoid the accumulation of the soybean powder on the support table 102 and affect the subsequent powder discharge, thereby further improving the operation efficiency and reliability of the grinding device and ensuring the smooth progress of the entire grinding process.

[0042] Further optimization scheme, the protective shell 1 is provided with an adjusting cavity 106, and an adjusting plate 105 is slidably connected in the adjusting cavity 106. The adjusting plate 105 extends out of the adjusting cavity 106 and adjusts the outlet area of the feeding hopper 101, facilitating the adjustment of the inflow of soybeans. An adjusting screw hole 112 is formed in the adjusting plate 105, and an adjusting screw 107 is threadedly connected in the adjusting screw hole 112. The adjusting screw 107 is rotatably connected in the adjusting cavity 106 and can drive the adjusting plate 105 to slide in the adjusting cavity 106. By adjusting the outlet area of the feeding hopper 101 through the adjusting plate 105, the inflow of soybeans can be flexibly controlled, so that the grinding device can reasonably adjust the feeding speed according to different production demands and the characteristics of soybeans, thereby better ensuring the stability of the grinding process and the uniformity of the soybean powder quality, and improving the adaptability and flexibility of the grinding device.

[0043] In one embodiment of the present invention, a positioning groove 108 corresponding to the regulating chamber 106 is opened on the side wall of the feed hopper 101, and a positioning plate 109 is elastically connected to the positioning groove 108 through a positioning spring 110. The positioning plate 109 can block the positioning groove 108 when not subject to external force to prevent soybean accumulation.

[0044] In one embodiment of the present invention, an adjusting knob 111 is rotatably connected to the protective shell 1 , and the adjusting knob 111 is transmission-connected to the adjusting screw 107 to drive the adjusting screw 107 .

[0045] In a further optimized solution, the air separation assembly includes an air separator 201 disposed within the protective housing 1. An air outlet 205 of the air separator 201 communicates with the side wall of the material guide pipe 2 via an air separation pipe 202. A slag discharge pipe 206, located opposite the air separation pipe 202 and extending from the protective housing 1, is connected to the side wall of the material guide pipe 2. The air separator 201 can sort the soybeans before they enter the grinding mechanism 3, removing impurities and other substances from the soybeans and discharging them through the slag discharge pipe 206. This ensures higher quality soybeans entering the grinding mechanism 3, further improving the purity and quality of the final soybean powder. It also helps improve grinding efficiency and reduces interference from impurities in the grinding process.

[0046] In one embodiment of the present invention, the material guide pipe 2 is provided with an air inlet 203 and an air outlet 205 which are relatively arranged. The air inlet 203 is connected to the outlet of the air separation pipe 202, and the high end of the slag discharge pipe 206 is connected to the air outlet 205, forming an air separation channel to facilitate air separation.

[0047] In one embodiment of the present invention, an interception net 204 is provided on the air inlet 203 to prevent soybeans from entering the air inlet 203 .

[0048] In a further optimization, a recirculation motor 414 is fixedly mounted at the top of recirculation drum 401. The output end of recirculation motor 414 extends into recirculation drum 401 and is in driving connection with a screw conveyor 415 rotatably connected within recirculation drum 401. The top of recirculation drum 401 is connected to feed guide pipe 2 via an inclined recirculation pipe 416. Recirculation motor 414 drives screw conveyor 415, effectively conveying unqualified soybean powder from recirculation drum 401 back to feed guide pipe 2 after screening. This ensures the efficiency and reliability of the recirculation process, further improving raw material utilization and the overall production efficiency of the grinding device, and reducing production interruptions caused by poor soybean powder recirculation.

[0049] Further optimization scheme, the support table 102 is provided with driving cavity 409, driving cavity 409 install driving motor 410, the output shaft of driving motor 410 is connected with driving gear 411, driving gear 411 is engaged with driven gear 412, driven gear 412 is connected with transmission shaft 413 fixed in the bottom end of rotary disc 302 transmission.The transmission connection of driving motor 410, driving gear 411, driven gear 412 and transmission shaft 413 provides stable power source for the rotation of rotary disc 302, ensures that rotary disc 302 can continuously, stably rotate, to ensure that the grinding mechanism 3 can normally, efficiently run, further improve the automation degree and operating stability of grinding device, to improve the reliable power guarantee of bean powder particle size refinement.

[0050] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0051] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A grinding device for improving the particle size refinement of soybean powder, characterized in that: include: A protective shell (1), the protective shell (1) is fixed on the ground, and a feed hopper (101) with adjustable flow rate is provided at the top of the protective shell (1); A material guide pipe (2), the material guide pipe (2) is arranged in the inner cavity of the protective shell (1) and is connected to the outlet of the feed hopper (101), and a side wall of the material guide pipe (2) is provided with an air separation component for sorting soybeans; The grinding mechanism (3) comprises a fixed disk (301) and a rotating disk (302) coaxially arranged above and below, a grinding chamber (303) being provided between the fixed disk (301) and the rotating disk (302), and the bottom end of the guide tube (2) being fixedly connected to the top end of the fixed disk (301) and communicating with the grinding chamber (303); A screening cylinder (4) is fixedly connected to the protective shell (1) and is coaxially arranged with the rotating disk (302). A return cylinder (401) connected to the guide pipe (2) is arranged outside the screening cylinder (4). The soybean powder ground by the grinding chamber (303) is screened and the soybean powder meeting the requirements falls into the storage bin (104) in the protective shell (1). The unqualified soybean powder screened out is transported back to the guide pipe (2) by the return cylinder (401).

2. The grinding device for improving the particle size refinement of soybean powder according to claim 1, characterized in that: A screening net (402) is provided in the screening cylinder (4), and the screening net (402) surrounds the rotating disk (302) and is rotatably connected to the rotating disk (302). The top surface of the screening net (402) is lower than the bottom end of the grinding chamber (303), and the soybean powder ground in the grinding chamber (303) falls onto the screening net (402) for screening.

3. The grinding device for improving the particle size refinement of soybean powder according to claim 2, characterized in that: The side wall of the screening cylinder (4) is provided with a return material port (403) corresponding to the return material cylinder (401), and the return material port (403) is communicated with the inner cavity of the screening cylinder (4); the return material port (403) is located above the screening net (402), and the residual soybean powder screened by the screening net (402) enters the return material cylinder (401) through the return material port (403).

4. The grinding device for improving the particle size refinement of soybean powder according to claim 2, characterized in that: A support platform (102) is provided in the protective shell (1), the rotating disk (302) is rotatably connected to the support platform (102), a powder outlet (103) is provided through the support platform (102), and the powder outlet (103) is located between the screening cylinder (4) and the rotating disk (302), and the sieved soybean powder enters the storage bin (104) through the powder outlet (103).

5. The grinding device for improving the particle size refinement of soybean powder according to claim 4, characterized in that: A plurality of rolling shafts (404) are arranged at equal intervals around the outer wall of the rotating disk (302), and one end of the rolling shaft (404) away from the rotating disk (302) is slidably connected to the inner wall of the screening drum (4); a rolling roller (406) is rotatably connected to the rolling shaft (404), and the outer wall of the rolling roller (406) rolls on the support platform (102).

6. The grinding device for improving the particle size refinement of soybean powder according to claim 4, characterized in that: The outer wall of the fixed plate (301) is fixedly connected with a plurality of first cleaning brushes (407) and second cleaning brushes (408) arranged up and down, the first cleaning brushes (407) are in sliding contact with the top surface of the screening net (402), and the second cleaning brushes (408) are in sliding contact with the top surface of the support platform (102).

7. The grinding device for improving the particle size refinement of soybean powder according to claim 1, characterized in that: The protective shell (1) is provided with an adjustment cavity (106), an adjustment plate (105) is slidably connected in the adjustment cavity (106), and the adjustment plate (105) extends out of the adjustment cavity (106) and adjusts the outlet area of ​​the feed hopper (101), thereby facilitating adjustment of the inflow of soybeans.

8. The grinding device for improving the particle size refinement of soybean powder according to claim 1, characterized in that: The air separation component comprises an air separator (201) arranged in the protective shell (1); the air outlet (205) of the air separator (201) is connected to the side wall of the material guide pipe (2) through the air separation pipe (202); the side wall of the material guide pipe (2) is connected to a slag discharge pipe (206) opposite to the air separation pipe (202), and the slag discharge pipe (206) extends out of the protective shell (1).

9. The grinding device for improving the particle size refinement of soybean powder according to claim 1, characterized in that: A return motor (414) is fixedly mounted on the top of the return barrel (401), and the output end of the return motor (414) extends into the return barrel (401) and is transmission-connected to a screw conveyor (415) rotatably connected to the return barrel (401); the top of the return barrel (401) is connected to the guide pipe (2) via an inclined return pipe (416).

10. The grinding device for improving the particle size refinement of soybean powder according to claim 4, characterized in that: A driving chamber (409) is provided on the support platform (102), a driving motor (410) is installed in the driving chamber (409), an output shaft of the driving motor (410) is connected to a driving gear (411), the driving gear (411) is meshed with a driven gear (412), and the driven gear (412) is connected to a transmission shaft (413) fixed to the bottom end of the rotating disk (302).

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