Coarse cereal grinding device and grinding method

Abstract

The invention relates to the technical field of coarse cereal grinding, and discloses a coarse cereal grinding device and a grinding method.The coarse cereal grinding device comprises a screening bin, an air bin is supported in the middle of the top of the screening bin, a collecting hopper is arranged at the top of the air bin, a grinding bin is supported at the top of the collecting hopper, and a main transmission shaft is arranged on the outer side of the grinding bin; according to the coarse cereal grinding device, the grinding function of coarse cereals is achieved through the arrangement of the lower grinding set and the upper grinding set, the piston bin is arranged, external airflow is conveyed to the position above the grinding area of the upper grinding set and the lower grinding set through power transmission, then in the grinding process, ground powder is pushed through the airflow, and the grinding efficiency is improved. Meanwhile, the airflow also exchanges heat of the grinding areas of the upper grinding group and the lower grinding group, so that the cooling function is realized, and the high-temperature fire risk caused by long-term high-temperature grinding of the upper grinding group and the lower grinding group is prevented.

Description

Technical Field

[0001] The invention relates to the field of grain grinding, and more particularly to a grain grinding device and a grain grinding method. Background Art

[0002] Coarse grains usually refer to grain and bean crops other than the five major crops of rice, wheat, corn, soybeans and potatoes. Coarse grains are rich in nutrients, beneficial to human health, and have the effects of relieving constipation, regulating blood lipids and supplementing nutrition. For people's convenience, coarse grains are usually ground into powder and then consumed.

[0003] Existing grinding devices have various structures, but the grains themselves have a small amount of moisture. At the same time, some grains are also oily. In the actual grinding process, the powder of the grains is easily ground into powder, which leads to increased viscosity between the powders. Combined with moisture and oil, the powder blocks the grinding roller. When the grinding roller continues to rotate, a large amount of heat is generated, which leads to dangerous situations such as powder combustion or even explosion. Therefore, a grinding device that can promote the movement of powder during the grain grinding process is needed. Summary of the invention

[0004] The present invention provides a grain grinding device and a grinding method, which solve the technical problem in the related art that the grain powder after grinding in the grinding device is easy to block the grinding area, resulting in the material being unable to descend and causing dangerous production accidents.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A grain grinding device and grinding method, comprising a screening bin, a wind bin is supported in the middle of the top of the screening bin, a collecting hopper is arranged on the top of the wind bin, a grinding bin is supported on the top of the collecting hopper, a main transmission shaft is arranged on the outside of the grinding bin, and an input end of the main transmission shaft is transmission-connected to an external drive mechanism;

[0007] A grinding mechanism is arranged inside the grinding chamber, and a main gear is arranged at the top of the main transmission shaft, and the main gear rotates with the main transmission shaft to drive the grinding mechanism to rotate;

[0008] A fan mechanism is provided on one side of the wind bin, the fan mechanism is mechanically connected to the main transmission shaft, and the fan mechanism conveys external airflow to the interior of the wind bin;

[0009] A screening mechanism is provided inside the screening bin, and a linkage mechanism is provided between the screening mechanism, the fan mechanism and the main transmission shaft, and the linkage mechanism is used to transmit the driving force of the main transmission shaft to the screening mechanism and the fan mechanism respectively;

[0010] A piston suction mechanism is arranged at a position near the fan mechanism on the top of the screening bin, and the piston suction mechanism is mechanically connected with the linkage mechanism, and the piston suction mechanism is used to transport airflow or water to the interior of the grinding mechanism.

[0011] As a further optimization scheme of the present invention, the grinding mechanism includes an upper grinding group rotatably connected to the inner wall of the grinding bin and a lower grinding group fixedly connected to the inner wall of the grinding bin, and the lower grinding group is located directly below the upper grinding group, a grinding groove is provided at the bottom of the upper grinding group, and a grinding area is formed between the top of the lower grinding group and the grinding groove, thereby grinding the miscellaneous grains.

[0012] As a further optimization scheme of the present invention, a gear ring is provided on the outer side of the upper grinding group, the outer side of the main gear extends to the interior of the grinding bin and meshes with the gear ring, and a support bearing is provided on the top of the outer side of the upper grinding group, and the outer side of the support bearing is embedded in the interior of the grinding bin and rotates inside the grinding bin.

[0013] As a further optimization scheme of the present invention, a feed hopper is provided in the middle part of the top of the upper grinding group, an air guide ring is provided at the edge position of the top of the upper grinding group, an air bin is provided at the top of the inner wall of the grinding bin and is sleeved on the outside of the air guide ring, a plurality of groups of through holes are evenly distributed on the inner side of the air bin, an air guide hole is provided at the top of the upper grinding group located inside the air guide ring, the other end of the air guide hole passes through from the inside of the upper grinding group to the top position of the grinding groove, and the feed hopper and the grinding groove are connected to each other.

[0014] As a further optimization scheme of the present invention, the fan mechanism includes a fan arranged on one side of the wind bin, a secondary transmission shaft is arranged at the center position of the fan, a driven bevel gear is arranged at one end of the secondary transmission shaft, a driving bevel gear meshing with the driven bevel gear is arranged on the outer side of the main transmission shaft, a bearing seat matched with the secondary transmission shaft is arranged at the bottom of the collecting hopper, and a discharge end is arranged on the side of the wind bin away from the fan, and the discharge end is used to discharge bran impurities separated by air blowing of the fan.

[0015] As a further optimization scheme of the present invention, the screening mechanism includes a sieve plate arranged inside the screening bin, and support shafts rotatably connected to the inner wall of the screening bin are respectively provided at both ends of the sieve plate, one end of a group of the support shafts extends to the outside of the screening bin and is provided with a connecting rod, a first material guide plate is provided at both ends of the screening bin, a second material guide plate is provided on one side of the screening bin, and discharge ports are provided at both ends of the sieve plate.

[0016] As a further optimization scheme of the present invention, the piston suction mechanism includes a piston chamber arranged on one side of the top of the screening chamber, a piston plate is arranged inside the piston chamber, a piston rod is arranged in the middle of the top of the piston plate, the top of the piston rod extends to the top of the piston chamber, and springs fixedly connected to the inner wall of the piston chamber are evenly distributed at the edge position of the top of the piston plate, a conduit, a water inlet pipe and an air inlet port are respectively arranged at the bottom of one side of the piston chamber, and a one-way control valve is arranged on the outside of the conduit, the water inlet pipe and the air inlet port.

[0017] As a further optimization scheme of the present invention, the input end of the water inlet pipe is connected to the external water source, the water inlet pipe and the air inlet port are opened independently, and the other end of the conduit extends to the interior of the grinding chamber and is connected to the air chamber.

[0018] As a further optimization scheme of the present invention, the linkage mechanism includes a crankshaft arranged on the outside of the auxiliary transmission shaft, a hinged rod is arranged on the outside of the crankshaft, the other end of the hinged rod is hinged to the connecting rod, and a cam is also arranged on the outside of the auxiliary transmission shaft and fits with the top of the piston rod. The cam and the crankshaft both rotate with the auxiliary transmission shaft, thereby respectively driving the piston rod to displace and the hinged rod to swing back and forth.

[0019] A grain grinding device, the grinding method steps are as follows:

[0020] Step 1: First, start the external drive mechanism to drive the main transmission shaft to rotate, drive the main gear to rotate through the main transmission shaft, and drive the grinding mechanism to rotate through the main gear;

[0021] Step 2: Through the transmission of the linkage mechanism, the rotational force of the main transmission shaft is transmitted to the fan mechanism, the piston suction mechanism, and the screening mechanism respectively, the external airflow is transported to the inside of the wind bin through the fan mechanism, the external airflow is transported to the grinding mechanism through the piston suction mechanism, and the grain powder is screened through the screening mechanism;

[0022] Step 3: Then, add the grains to be ground from the top of the grinding bin to the grinding mechanism inside the grinding bin for grinding;

[0023] Step 4: The ground cereal powder falls to the position of the wind bin, and the bran impurities in the powder are removed by the fan mechanism. Further, the cereal powder falls to the screening mechanism for powder particle screening, thus completing the grinding of the cereals;

[0024] Step 5: Finally, start the device to run idle, and transport external water to the inside of the grinding chamber through the piston mechanism, thereby cleaning the device from top to bottom.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention realizes the grinding function of grains by providing a lower grinding group and an upper grinding group, and by providing a piston chamber, the external airflow is transported to the upper part of the grinding area of ​​the upper grinding group and the lower grinding group through the transmission of power, and then in the grinding process, the ground powder is pushed by the airflow, so that the ground powder keeps displacement, and at the same time, the airflow also exchanges heat with the grinding area of ​​the upper grinding group and the lower grinding group to achieve the function of cooling, thereby preventing the risk of high-temperature fire caused by long-term high-temperature grinding of the upper grinding group and the lower grinding group;

[0027] 2. The present invention separates the bran from the ground cereal powder by providing a fan mechanism, thereby improving the purity of the powder. Meanwhile, the present invention screens the cereal powder by providing a screening device, thereby further improving the quality of the cereal powder.

[0028] 3. The present invention realizes air flow delivery to the grinding area by providing a piston suction mechanism, which not only promotes the displacement of the grain powder but also realizes the temperature reduction function. Furthermore, when the device is idling, the piston suction mechanism can be used to transport external water to the inside of the device, thereby completing the top-down flushing function and improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The structure of the grain grinding device of the present invention is a three-dimensional schematic diagram Figure 1 ;

[0030] Figure 2 The structure of the grain grinding device of the present invention is a three-dimensional schematic diagram Figure 2 ;

[0031] Figure 3 It is a structural three-dimensional cross-sectional view of the miscellaneous grain grinding device of the present invention;

[0032] Figure 4 It is an enlarged schematic diagram of the structure of the grinding mechanism in the grain grinding device of the present invention;

[0033] Figure 5 It is an enlarged cross-sectional view of the grinding structure of the grain grinding device of the present invention;

[0034] Figure 6 yes Figure 5 A schematic diagram of the structure at A;

[0035] Figure 7 It is an enlarged cross-sectional view of the connection structure of the fan mechanism and the screening mechanism in the grain grinding device of the present invention;

[0036] Figure 8 It is an enlarged cross-sectional view of the connection structure of the screening mechanism and the piston suction mechanism in the grain grinding device of the present invention;

[0037] Fig. 9 It is an enlarged schematic diagram of the structure of the piston suction mechanism in the grain grinding device of the present invention;

[0038] In the figure: 1. screening bin; 2. first guide plate; 3. second guide plate; 4. discharge end; 5. air bin; 6. hinge rod; 7. piston bin; 8. driven bevel gear; 9. driving bevel gear; 10. main transmission shaft; 11. main gear; 12. grinding bin; 13. conduit; 14. support bearing; 15. gear ring; 16. lower grinding group; 17. sieve plate; 18. upper grinding group; 19. air bin; 20. feed hopper; 21. through hole; 22. air guide hole; 23. grinding groove; 24. air guide ring; 25. collecting hopper; 26. fan; 27. water inlet pipe; 28. piston plate; 29. ​​spring; 30. cam; 31. piston rod; 32. crankshaft; 33. connecting rod; 34. support shaft; 35. auxiliary transmission shaft; 36. intake port. DETAILED DESCRIPTION

[0039] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0040] Example 1

[0041] like Figures 1 to 9 As shown, a grain grinding device comprises a screening bin 1, a wind bin 5 is supported in the middle of the top of the screening bin 1, a collecting hopper 25 is arranged on the top of the wind bin 5, a grinding bin 12 is supported on the top of the collecting hopper 25, a main transmission shaft 10 is arranged on the outer side of the grinding bin 12, and an input end of the main transmission shaft 10 is transmission-connected to an external driving mechanism;

[0042] A grinding mechanism is provided inside the grinding bin 12, a main gear 11 is provided at the top of the main transmission shaft 10, and the main gear 11 rotates with the main transmission shaft 10 to drive the grinding mechanism to rotate, and the grinding mechanism includes an upper grinding group 18 rotatably connected to the inner wall of the grinding bin 12 and a lower grinding group 16 fixedly connected to the inner wall of the grinding bin 12, and the lower grinding group 16 is located directly below the upper grinding group 18, a grinding groove 23 is provided at the bottom of the upper grinding group 18, and a grinding area is formed between the top of the lower grinding group 16 and the grinding groove 23, so as to grind the grains, and a gear ring 15 is provided on the outer side of the upper grinding group 18, and the outer side of the main gear 11 extends to the inside of the grinding bin 12 and meshes with the gear ring 15 A support bearing 14 is provided at the top of the outer side of the upper grinding group 18, and the outer side of the support bearing 14 is embedded in the grinding chamber 12 and rotates inside the grinding chamber 12. A feed hopper 20 is provided in the middle of the top of the upper grinding group 18, and an air guide ring 24 is provided at the edge of the top of the upper grinding group 18. An air chamber 19 sleeved on the outer side of the air guide ring 24 is provided at the top of the inner wall of the grinding chamber 12. A plurality of groups of through holes 21 are evenly distributed on the inner side of the air chamber 19. An air guide hole 22 is provided at the top of the upper grinding group 18 at a position inside the air guide ring 24. The other end of the air guide hole 22 penetrates from the inside of the upper grinding group 18 to the top position of the grinding groove 23, and the feed hopper 20 and the grinding groove 23 are connected to each other;

[0043] A fan mechanism is provided on one side of the wind bin 5, and the fan mechanism is mechanically connected with the main transmission shaft 10, and the fan mechanism conveys external airflow to the inside of the wind bin 5. The fan mechanism includes a fan 26 arranged on one side of the wind bin 5, and a secondary transmission shaft 35 is arranged at the center of the fan 26. A driven bevel gear 8 is arranged at one end of the secondary transmission shaft 35, and a driving bevel gear 9 meshing with the driven bevel gear 8 is arranged on the outer side of the main transmission shaft 10. A bearing seat adapted to the secondary transmission shaft 35 is arranged at the bottom of the collecting hopper 25, and a discharging end 4 is arranged on the side of the wind bin 5 away from the fan 26, and the discharging end 4 is used to discharge bran impurities separated by air blowing from the fan 26;

[0044] The screening bin 1 is provided with a screening mechanism inside, and the screening mechanism includes a screen plate 17 arranged inside the screening bin 1, and support shafts 34 are respectively provided at both ends of the screen plate 17 and are rotatably connected to the inner wall of the screening bin 1, and one end of a group of support shafts 34 extends to the outside of the screening bin 1 and is provided with a connecting rod 33, and a first material guide plate 2 is provided at both ends of the screening bin 1, and a second material guide plate 3 is provided on one side of the screening bin 1, and a material outlet is provided at both ends of the screen plate 17, and a connecting rod 33 is provided between the screening mechanism, the fan mechanism and the main transmission shaft 10. The linkage mechanism is used to transmit the driving force of the main transmission shaft 10 to the screening mechanism and the fan mechanism respectively. The linkage mechanism includes a crankshaft 32 arranged on the outside of the auxiliary transmission shaft 35. A hinge rod 6 is arranged on the outside of the crankshaft 32. The other end of the hinge rod 6 is hinged to the connecting rod 33. A cam 30 is also arranged on the outside of the auxiliary transmission shaft 35 and is fitted to the top of the piston rod 31. The cam 30 and the crankshaft 32 rotate with the auxiliary transmission shaft 35, thereby driving the piston rod 31 to move and the hinge rod 6 to swing back and forth respectively.

[0045] A piston suction mechanism is provided at a position near the fan mechanism on the top of the screening bin 1, and the piston suction mechanism is mechanically connected to the linkage mechanism. The piston suction mechanism is used to transport airflow or water to the interior of the grinding mechanism. The piston suction mechanism includes a piston bin 7 arranged on one side of the top of the screening bin 1, and a piston plate 28 is provided inside the piston bin 7. A piston rod 31 is provided in the middle of the top of the piston plate 28, and the top of the piston rod 31 extends to the top of the piston bin 7. Springs 29 fixedly connected to the inner wall of the piston bin 7 are evenly distributed at the edge position of the top of the piston plate 28. A conduit 13, a water inlet pipe 27 and an air inlet port 36 are respectively provided at the bottom of one side of the piston bin 7, and a one-way control valve is provided on the outside of the conduit 13, the water inlet pipe 27 and the air inlet port 36. The input end of the water inlet pipe 27 is connected to an external water source, and the water inlet pipe 27 and the air inlet port 36 are opened independently. The other end of the conduit 13 extends to the interior of the grinding bin 12 and is connected to the air bin 19.

[0046] The use process of the grain grinding device proposed in this embodiment is as follows: when the grinding device is in use, firstly, the external driving mechanism is started to drive the main transmission shaft 10 to rotate, and then the main transmission shaft 10 rotates to drive the main gear 11 and the driving bevel gear 9 to rotate respectively;

[0047] The rotation of the main gear 11 drives the gear ring 15 meshing therewith to rotate, thereby driving the upper grinding group 18 to rotate as a whole through the gear ring 15, so that a grinding state is formed between the upper grinding group 18 and the lower grinding group 16;

[0048] The rotation of the active bevel gear 9 drives the driven bevel gear 8 meshing therewith to rotate, and then the driven bevel gear 8 drives the crankshaft 32, the cam 30, and the fan 26 to rotate respectively;

[0049] Through the rotation of the fan 26, the external airflow is transported to the interior of the wind bin 5 and discharged from the position of the discharge end 4;

[0050] The rotation of the crankshaft 32 drives the hinged rod 6 to swing, thereby driving the support shaft 34 connected to the connecting rod 33 to swing back and forth, so that the sieve plate 17 inside the screening bin 1 swings back and forth following the support shaft 34;

[0051] The cam 30 rotates and reciprocates to squeeze the piston rod 31, thereby causing the piston plate 28 to move inside the piston chamber 7, and transporting the airflow inside the piston chamber 7 to the inside of the air chamber 19. A part of the airflow transported to the inside of the air chamber 19 is discharged from the position of the through hole 21, and the other part is transported through the air guide hole 22 and introduced into the top position of the grinding groove 23;

[0052] The grains to be ground are added into the grinding bin 12, and flow downward from the position of the feed hopper 20 to the position of the grinding groove 23, and are ground into powder through the extrusion and grinding of the grinding groove 23 and the lower grinding group 16. During the grinding process, the airflow discharged through the air guide hole 22 blows the grinding area between the grinding groove 23 and the lower grinding group 16, so that the ground grain powder is displaced downward, preventing the grain powder from accumulating in the grinding area due to its high viscosity, thereby ensuring the normal grinding of the grains;

[0053] At the same time, in the process of blowing the grain powder in the grinding area, the hot air flow in the grinding area is heat exchanged by the air flow, thereby reducing the temperature of the grain powder, the grinding tank 23 and the lower grinding group 16 in the area, avoiding the powder combustion accident caused by the high temperature generated by long-term rotation friction, and also prolonging the service life of the grinding tank 23 and the lower grinding group 16;

[0054] The ground grain powder is transported to the wind bin 5 through the collecting hopper 25, and the grain bran carried in the powder is separated by the air flow 26 and discharged from the discharging end 4, and the grain powder further falls to the screen plate 17 for screening.

[0055] The coarse grain powder is screened by the reciprocating swing of the sieve plate 17, and the large-particle powder is retained on the top of 17, and is discharged from the discharge ports at both ends of the sieve plate 17 as the sieve plate 17 reciprocates, and falls to the top of the first guide plate 2, and then is discharged from the position of the first guide plate 2, while the screened coarse grain fine powder falls through the sieve holes of the sieve plate 17 to the position of the second guide plate 3, and then is discharged through the second guide plate 3, thereby completing the process of grinding and screening the coarse grains;

[0056] Furthermore, when the grinding is completed, the device is started to idle, the water inlet pipe 27 is opened, and the air inlet port 36 is closed, so that the external water source is transported to the interior of the piston chamber 7 through the fan 26, and the water source is transported to the interior of the grinding chamber 12 through the suction action of the piston plate 28, and then the interior of the grinding chamber 12 is cleaned. The water flow from top to bottom comprehensively cleans the interior of the device, which improves the cleaning convenience of the device and also realizes the versatility of the device structure.

[0057] Example 2

[0058] like Figure 1 , Figure 2 As shown, a grain grinding device, the grinding method steps are as follows:

[0059] Step 1: First, start the external driving mechanism to drive the main transmission shaft 10 to rotate, drive the main gear 11 to rotate through the main transmission shaft 10, and drive the grinding mechanism to rotate through the main gear 11;

[0060] Step 2: Through the transmission of the linkage mechanism, the rotational force of the main transmission shaft 10 is transmitted to the fan mechanism, the piston suction mechanism, and the screening mechanism respectively, the external airflow is transported to the inside of the wind bin 5 through the fan mechanism, the external airflow is transported to the grinding mechanism through the piston suction mechanism, and the miscellaneous grain powder is screened through the screening mechanism;

[0061] Step 3: Then, the grains to be ground are added from the top of the grinding bin 12 to the grinding mechanism inside the grinding bin 12 for grinding;

[0062] Step 4: The ground cereal powder falls to the position of the wind bin 5, and the bran impurities in the powder are removed by the fan mechanism. Further, the cereal powder falls to the screening mechanism for powder particle screening, thereby completing the grinding of the cereals;

[0063] Step 5: Finally, the device is started to run idle, and the external water is transported to the inside of the grinding chamber 12 through the piston mechanism, thereby cleaning the device from top to bottom.

[0064] The above describes an embodiment of the present embodiment, but the present embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present embodiment, ordinary technicians in this field can also make many forms, all of which are within the protection of the present embodiment.

Claims

1. A grain grinding device, It is characterized in that The invention comprises a screening bin (1), wherein a wind bin (5) is supported in the middle of the top of the screening bin (1), a collecting hopper (25) is arranged on the top of the wind bin (5), a grinding bin (12) is supported on the top of the collecting hopper (25), a main transmission shaft (10) is arranged on the outside of the grinding bin (12), and an input end of the main transmission shaft (10) is transmission-connected to an external driving mechanism; A grinding mechanism is arranged inside the grinding chamber (12), a main gear (11) is arranged at the top end of the main transmission shaft (10), and the main gear (11) rotates along with the main transmission shaft (10) to drive the grinding mechanism to rotate; A fan mechanism is provided on one side of the wind bin (5), the fan mechanism is mechanically connected to the main transmission shaft (10), and the fan mechanism conveys external airflow to the interior of the wind bin (5); A screening mechanism is provided inside the screening bin (1), and a linkage mechanism is provided between the screening mechanism, the fan mechanism and the main transmission shaft (10), and the linkage mechanism is used to transmit the driving force of the main transmission shaft (10) to the screening mechanism and the fan mechanism respectively; A piston suction mechanism is arranged at a position near the fan mechanism on the top of the screening bin (1), and the piston suction mechanism is mechanically connected to the linkage mechanism. The piston suction mechanism is used to transport airflow or water to the interior of the grinding mechanism.

2. A grain grinding device according to claim 1, It is characterized in that The grinding mechanism comprises an upper grinding group (18) rotatably connected to the inner wall of a grinding bin (12) and a lower grinding group (16) fixedly connected to the inner wall of the grinding bin (12), wherein the lower grinding group (16) is located directly below the upper grinding group (18), a grinding groove (23) is provided at the bottom of the upper grinding group (18), and a grinding area is formed between the top of the lower grinding group (16) and the grinding groove (23), thereby grinding the grains.

3. A grain grinding device according to claim 2, It is characterized in that A gear ring (15) is arranged on the outer side of the upper grinding group (18), the outer side of the main gear (11) extends to the inside of the grinding chamber (12) and meshes with the gear ring (15), and a support bearing (14) is arranged on the top of the outer side of the upper grinding group (18), and the outer side of the support bearing (14) is embedded in the inside of the grinding chamber (12) and rotates inside the grinding chamber (12).

4. A grain grinding device according to claim 3, It is characterized in that A feed hopper (20) is provided in the middle of the top of the upper grinding group (18), an air guide ring (24) is provided at the edge of the top of the upper grinding group (18), an air bin (19) sleeved on the outside of the air guide ring (24) is provided at the top of the inner wall of the grinding bin (12), a plurality of groups of through holes (21) are evenly distributed on the inner side of the air bin (19), an air guide hole (22) is provided at the top of the upper grinding group (18) at a position inside the air guide ring (24), the other end of the air guide hole (22) passes through from the inside of the upper grinding group (18) to the top of the grinding groove (23), and the feed hopper (20) and the grinding groove (23) are connected to each other.

5. A grain grinding device according to claim 4, It is characterized in that The fan mechanism comprises a fan (26) arranged on one side of a wind bin (5); a secondary transmission shaft (35) is arranged at the center of the fan (26); a driven bevel gear (8) is arranged at one end of the secondary transmission shaft (35); a driving bevel gear (9) meshing with the driven bevel gear (8) is arranged on the outer side of the main transmission shaft (10); a bearing seat matched with the secondary transmission shaft (35) is arranged at the bottom of the collecting hopper (25); a discharge end (4) is arranged on the side of the wind bin (5) away from the fan (26); and the discharge end (4) is used to discharge bran impurities separated by air blowing from the fan (26).

6. A grain grinding device according to claim 5, It is characterized in that The screening mechanism comprises a screen plate (17) arranged inside a screening bin (1), support shafts (34) rotatably connected to the inner wall of the screening bin (1) are respectively arranged at both ends of the screen plate (17), one end of a group of the support shafts (34) extends to the outside of the screening bin (1) and is provided with a connecting rod (33), first material guide plates (2) are arranged at both ends of the screening bin (1), a second material guide plate (3) is arranged on one side of the screening bin (1), and discharge ports are arranged at both ends of the screen plate (17).

7. A grain grinding device according to claim 6, It is characterized in that The piston suction mechanism comprises a piston chamber (7) arranged on one side of the top of the screening chamber (1); a piston plate (28) is arranged inside the piston chamber (7); a piston rod (31) is arranged in the middle of the top of the piston plate (28); the top end of the piston rod (31) extends to the top of the piston chamber (7); springs (29) fixedly connected to the inner wall of the piston chamber (7) are evenly distributed at the edge of the top of the piston plate (28); a conduit (13), a water inlet pipe (27) and an air inlet port (36) are respectively arranged at the bottom of one side of the piston chamber (7); and one-way control valves are arranged on the outer sides of the conduit (13), the water inlet pipe (27) and the air inlet port (36).

8. A grain grinding device according to claim 7, It is characterized in that The input end of the water inlet pipe (27) is connected to an external water source, the water inlet pipe (27) and the air inlet port (36) are opened independently, and the other end of the conduit (13) extends to the interior of the grinding chamber (12) and is connected to the air chamber (19).

9. A grain grinding device according to claim 8, It is characterized in that The linkage mechanism comprises a crankshaft (32) arranged on the outside of the auxiliary transmission shaft (35), a hinge rod (6) is arranged on the outside of the crankshaft (32), the other end of the hinge rod (6) is hinged to the connecting rod (33), and a cam (30) is also arranged on the outside of the auxiliary transmission shaft (35) and is in contact with the top of the piston rod (31). The cam (30) and the crankshaft (32) both rotate with the auxiliary transmission shaft (35), thereby respectively driving the piston rod (31) to move and the hinge rod (6) to swing back and forth.

10. A method for grinding grains, using the device for grinding grains as claimed in claim 1, wherein the grinding method comprises the following steps: Step 1: First, start the external drive mechanism to drive the main transmission shaft (10) to rotate, drive the main gear (11) to rotate through the main transmission shaft (10), and drive the grinding mechanism to rotate through the main gear (11); Step 2: The rotational force of the main transmission shaft (10) is transmitted to the fan mechanism, the piston suction mechanism, and the screening mechanism respectively through the transmission of the linkage mechanism, the external airflow is transported to the inside of the wind bin (5) through the fan mechanism, the external airflow is transported to the grinding mechanism through the piston suction mechanism, and the miscellaneous grain powder is screened through the screening mechanism; Step 3: Then, the grains to be ground are added from the top of the grinding bin (12) to the grinding mechanism inside the grinding bin (12) for grinding; Step 4: The ground cereal powder falls to the position of the wind bin (5), and the bran impurities in the powder are removed by the fan mechanism. Further, the cereal powder falls to the screening mechanism for powder particle screening, thereby completing the grinding of the cereals; Step 5: Finally, the device is started to run idle, and external water is transported to the interior of the grinding chamber (12) through the piston mechanism, thereby achieving top-down cleaning of the device.

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