An air-controlled mill for preparing coarse grain nutritious powder

Abstract

The present invention relates to the technical field of milling machines, and proposes an air-controlled milling machine for preparing nutritious powder of various grains, comprising a machine body, a feeding channel and a plurality of air inlet nozzles, the top of the machine body is connected with a classifier, and also comprises a crushing chamber, a telescopic discharge pipe, an opening and closing component and a wall-sticking cleaning component, the top of the machine body is connected with a classifier, and is characterized in that it also comprises a crushing chamber, a telescopic discharge pipe, an opening and closing component and a wall-sticking cleaning component, two crushing chambers are provided, and the crushing chamber can be lifted and arranged inside the machine body; the opening and closing component is used to open and close the connecting pipe; the wall-sticking cleaning component is used to clean the material adhered to the inner wall of the crushing chamber, and the wall-sticking cleaning component comprises a cleaning ring and a purge nozzle, and the cleaning ring can be lifted and arranged inside the crushing chamber, and the purge nozzle is connected with the cleaning ring. Through the above technical scheme, the problem of high-speed collision between various grains and the inner wall of the crushing chamber in the prior art, which easily leads to wall sticking and damage to the crushing chamber, is solved.

Description

Technical Field

[0001] The invention relates to the technical field of mills, and in particular to an air-controlled mill for preparing miscellaneous grain nutritional powder. Background Art

[0002] The pneumatic grinding mill, classifier, dust collector and induced draft fan form a complete pulverizing system. After being filtered and dried, the compressed air is sprayed into the pulverizing chamber at high speed through the Laval nozzle. At the intersection of multiple high-pressure airflows, the material is repeatedly collided, rubbed, sheared and pulverized. The pulverized material moves to the grading area with the rising airflow under the suction force of the fan. Under the strong centrifugal force generated by the high-speed rotating grading turbine, the coarse and fine materials are separated. The fine particles that meet the particle size requirements enter the classifier and dust collector through the grading wheel for collection, and the coarse particles fall into the pulverizing area for further pulverization. It can be used for the preparation of miscellaneous grain nutritional powder. The miscellaneous grains are injected into the inside of the pulverizing chamber for pulverization.

[0003] The materials ejected by the Laval nozzle collide with each other in the grinding chamber, and at the same time, the materials collide with the inner wall of the grinding chamber to achieve powdering of the materials. However, due to the action of the materials with the high-speed airflow, the inner wall of the grinding chamber will produce violent collision and friction with the materials for a long time, which will aggravate the damage of the grinding chamber and cause certain pollution to the product. At the same time, the high-speed impact of the materials on the inner wall of the grinding chamber may cause wall sticking. Especially for the processing of food such as grain nutritional powder, more attention should be paid to the safety and hygiene of the processing, and the grains contain moisture, which is more likely to cause wall sticking. Therefore, we propose an air-controlled grinding mill for the preparation of grain nutritional powder, which can clean and replace the inner wall of the grinding chamber, reduce the wall sticking phenomenon and the damage of the grinding chamber, and ensure the preparation quality of the nutritional powder. Summary of the invention

[0004] The invention provides an air-controlled mill for preparing miscellaneous grain nutritional powder, which solves the problem in the prior art that miscellaneous grains collide with the inner wall of a grinding chamber at high speed, which easily causes adhesion to the wall and damages the grinding chamber.

[0005] The technical solution of the present invention is as follows:

[0006] An air-controlled milling machine for preparing nutritious grain powder comprises a machine body, a feed channel and a plurality of air inlet nozzles, wherein the top of the machine body is connected to a classifier, and further comprises:

[0007] A crushing chamber, wherein two crushing chambers are provided, the two crushing chambers are connected by a connecting pipe, the crushing chamber can be raised and lowered inside the machine body, and the crushing chamber is provided with a feed port matching the feed channel and a plurality of air inlets matching the air inlet nozzles;

[0008] A telescopic discharge pipe, through which the top of the crushing chamber located above is connected to the classifier;

[0009] An opening and closing component, the opening and closing component is used to open and close the connecting pipe, and the opening and closing component includes:

[0010] An opening and closing plate, wherein two opening and closing plates are provided, and the opening and closing plates are movably arranged between the two crushing chambers, and the opening and closing plates and the connecting pipe are in sliding cooperation;

[0011] The sticky wall cleaning component is used to clean the materials adhered to the inner wall of the pulverizing chamber, and the sticky wall cleaning component includes:

[0012] A cleaning ring, which is arranged in a liftable manner inside the pulverizing chamber and is connected to an air inlet pipe;

[0013] A purge nozzle, wherein a plurality of the purge nozzles are provided and the purge nozzles are connected to the cleaning ring.

[0014] In order to realize the lifting of the cleaning ring, a lifting mechanism is also included, and the lifting mechanism is used to drive the cleaning ring to lift and lower, and the lifting mechanism includes:

[0015] A driving pipe, wherein two driving pipes are provided, and the two driving pipes are respectively arranged on one side of the two crushing chambers away from each other, and the driving pipe is connected to an air supply pipe;

[0016] A telescopic tube, through which the cleaning ring is connected to the driving tube;

[0017] A return spring is arranged inside the telescopic tube, and the cleaning ring is connected to the driving tube through the return spring.

[0018] In order to reduce the high temperature damage of the crushing chamber, a cooling component is also included, and the cooling component includes:

[0019] A cold water tank, the cold water tank being wrapped around the outside of the machine body;

[0020] A cooling pipe is arranged inside the cold water bin, the cleaning ring is connected to the cooling pipe, and the cooling pipe is connected to the air intake pipe.

[0021] In order to reduce the impact on the inner wall of the crushing chamber, a protective component is also included, and the protective component includes:

[0022] The liner is provided in plurality, the liner and the crushing chamber are in sliding fit, the liner is in contact with the inner wall of the crushing chamber, and the plurality of liners form a cylindrical shape matching the inner wall of the crushing chamber.

[0023] In order to replace the liner, a replacement assembly is also included, and the replacement assembly includes:

[0024] A rotating ring, wherein two rotating rings are provided, and the two rotating rings are respectively rotatably arranged on the sides of the two crushing chambers away from each other;

[0025] A replacement plate, a replacement opening is provided on the rotating ring, the size of the replacement opening is adapted to the size of the liner, and the replacement plate is detachably arranged at the replacement opening;

[0026] A disassembly plate, wherein two disassembly openings are provided on the machine body, and the disassembly plate is detachably arranged at the disassembly openings.

[0027] In order to prevent miscellaneous grains from entering between the two grinding chambers, a baffle ring is arranged between the two grinding chambers, the outer wall of the baffle ring is flush with the outer wall of the grinding chamber, and the baffle ring and the inner wall of the machine body are in a sealed sliding fit.

[0028] The working principle and beneficial effects of the present invention are:

[0029] 1. In the present invention, the two crushing chambers work alternately by lifting and lowering the crushing chamber, so as to avoid the same crushing chamber being in working state for a long time, thereby reducing the impact and collision of the material on the crushing chamber for a long time. At the same time, the crushing chamber is protected by the liner, and the surface of the material and the liner collide, thereby avoiding damage to the crushing chamber.

[0030] 2. In the present invention, the disassembly plate can be removed to rotate the rotating ring. By rotating the rotating ring, the replacement port can be rotated to the liner that needs to be replaced. The replacement plate can be opened to pull the liner out of the crushing chamber and replace the liner, thereby preventing the liner from being crushed under impact for a long time and causing contamination to the material.

[0031] 3. In the present invention, the outside of the machine body is cooled down by a cold water bin, air is supplied to the inside of the cooling pipe through an air intake pipe, the gas in the cooling pipe is cooled down by cold water, the air intake pipe supplies air to the inside of the cleaning ring, the inner wall of the crushing chamber is purged through a purge nozzle, and air is supplied to the inside of the driving pipe through an air supply pipe. The gas enters the interior of the telescopic tube to push the telescopic tube to extend, thereby driving the cleaning ring to move. When the air supply is stopped, the cleaning ring returns to its original position under the action of a reset spring, thereby cleaning the inner wall of the crushing chamber more comprehensively and reducing the sticking of materials to the wall.

[0032] 4. Therefore, compared with the pneumatically controlled grinding mill in the prior art, the present invention adopts two grinding chambers, which work alternately to reduce the continuous impact of materials on the same grinding chamber for a long time. At the same time, the inner wall of the grinding chamber is protected by the liner. The replacement port is rotated to the liner position by rotating the rotating ring, and the liner can be replaced. The gas is transported to the inside of the telescopic tube through the driving pipe to push the cleaning ring and the purge nozzle to rise and fall. The purge nozzle purges the surface of the liner to reduce the sticking of the material to the wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Figure 1 It is a schematic diagram of the structure of a partial cross-section of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the first viewing angle of the entire present invention;

[0036] Figure 3 It is a structural schematic diagram of the second viewing angle of the whole invention;

[0037] Figure 4 It is a schematic diagram of the structure of the crushing chamber, the opening and closing assembly and the sticky wall cleaning assembly of the present invention;

[0038] Figure 5 It is a schematic diagram of the structure of the crushing chamber, the inner lining and the sticky wall cleaning assembly of the present invention;

[0039] Figure 6 It is a structural schematic diagram of the wall sticking cleaning component and the lifting mechanism of the present invention;

[0040] Figure 7 It is a structural schematic diagram of the lifting mechanism of the present invention;

[0041] Figure 8 For the present invention Figure 4 A schematic diagram of the local enlarged structure at point A in the middle;

[0042] Fig. 9 For the present invention Figure 7 Schematic diagram of the local enlarged structure at point B in the middle.

[0043] In the figure:

[0044] 1. Machine body; 2. Feed channel; 3. Air inlet nozzle; 4. Classifier; 5. Crushing chamber; 6. Telescopic discharge pipe; 7. Connecting pipe; 8. Electric cylinder 1; 9. Retaining ring; 10. Feed hopper; 11. Gas filling pipe;

[0045] 101, opening and closing plate; 102, electric cylinder 2;

[0046] 201, cleaning ring; 202, purge nozzle; 203, air inlet pipe;

[0047] 301, driving tube; 302, telescopic tube; 303, return spring; 304, air supply tube;

[0048] 401, cold water tank; 402, cooling pipe;

[0049] 501, lining;

[0050] 601, swivel; 602, replacement plate; 603, removal plate. DETAILED DESCRIPTION

[0051] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0052] like Figures 1 to 9 As shown, this embodiment proposes an air-controlled grinding mill for preparing miscellaneous grain nutritional powder, including a machine body, a feed channel and a plurality of air inlet nozzles. The top of the machine body is connected to a classifier, and also includes a grinding chamber, a telescopic discharge pipe, an opening and closing component and a wall-sticking cleaning component. Compared with the air-controlled grinding mill in the prior art, the present invention adopts two grinding chambers, and the two grinding chambers work alternately to reduce the continuous impact of the material on the same grinding chamber for a long time. At the same time, the inner wall of the grinding chamber is protected by the liner, and the replacement port is rotated to the liner position by rotating the rotating ring, so that the liner can be replaced, and gas is transported to the inside of the telescopic tube through the driving tube to push the cleaning ring and the purge nozzle to rise and fall, and the purge nozzle purges the surface of the liner to reduce the material from sticking to the wall.

[0053] like Figures 1 to 4As shown, two crushing chambers 5 are provided, and the two crushing chambers 5 are connected by a connecting pipe 7. The crushing chamber 5 can be lifted and lowered inside the machine body 1. An electric cylinder 8 is provided on the machine body 1, and the crushing chamber 5 is provided at the output end of the electric cylinder 8. A feed port matching the feed channel 2 and multiple air inlets matching the air inlet nozzle 3 are provided on the crushing chamber 5. In order to prevent miscellaneous grains from entering between the two crushing chambers 5, a baffle ring 9 is provided between the two crushing chambers 5. The outer wall of the baffle ring 9 is flush with the outer wall of the crushing chamber 5, and the baffle ring 9 and the inner wall of the machine body 1 are in a sealed sliding fit. The two crushing chambers 5 can be driven to lift and lower by the electric cylinder 8. At the same time, the feed port and the air inlet on one crushing chamber 5 correspond to the positions of the feed channel 2 and the air inlet nozzle 3, and the other crushing chamber 5 is in a non-working area. A feed hopper 10 is provided on the upper part of the feed channel 2. , miscellaneous grains are added to the inside of the feed channel 2 through the feed hopper 10, and the side of the feed channel 2 away from the body 1 is connected to the gas filling pipe 11, and a high-pressure airflow is sprayed into the feed channel 2 through the gas filling pipe 11 to send the material into the inside of the crushing chamber 5. At the same time, a high-pressure airflow is transported to the inside of the crushing chamber 5 through the air intake nozzle 3, and a high-speed vortex is formed in the crushing chamber 5. The material circulates under the drive of the high-speed vortex, and the particles and the inner wall of the crushing chamber 5 impact, collide and rub against each other to grind the miscellaneous grains. The other crushing chamber 5 is in a resting state to avoid the material from continuously impacting the same crushing chamber 5 for a long time, thereby reducing the damage to the crushing chamber 5. When the two crushing chambers 5 are lifted and lowered to change their positions, the baffle ring 9 blocks the feed channel 2 and the air intake nozzle 3 to prevent the material from entering between the two crushing chambers 5.

[0054] like Figures 1 to 3 As shown, the top of the pulverizing chamber 5 located above is connected to the classifier 4 through a telescopic discharge pipe 6. The classifier 4, the cyclone separator, the dust collector, and the induced draft fan form a grading system. Under the suction force of the fan, the material moves at high speed from the inlet at the lower end of the classifier 4 to the grading area along with the rising air flow. Under the strong centrifugal force generated by the high-speed rotating grading turbine, the coarse and fine materials are separated. The fine particles that meet the particle size requirements enter the classifier 4 or the dust collector for collection through the gap between the grading wheel blades. The coarse particles carry some fine particles and disappear after hitting the wall. They fall along the cylinder wall to the secondary air outlet. After the strong washing effect of the secondary air, the coarse and fine particles are separated. The fine particles rise to the grading area for secondary classification, and the coarse particles fall to the discharge port for discharge. The materials discharged from the discharge port re-enter the inside of the pulverizing chamber 5 through the telescopic discharge pipe 6, and are mixed with subsequent materials until they are crushed to the required particle size. The lifting and lowering of the pulverizing chamber 5 can be achieved by the extension and retraction of the telescopic discharge pipe 6, while maintaining the connection between the classifier 4 and the pulverizing chamber 5.

[0055] like Figure 4As shown, the opening and closing assembly is used to open and close the connecting pipe 7, and the opening and closing assembly includes an opening and closing plate 101. Two opening and closing plates 101 are provided. The opening and closing plates 101 are movably arranged between the two crushing chambers 5. Two electric cylinders 102 are provided on the retaining ring 9. The opening and closing plates 101 are arranged at the output end of the electric cylinder 102. The opening and closing plates 101 and the connecting pipe 7 are in sliding cooperation. The electric cylinder 102 can drive the opening and closing plates 101 to move to open and close the connecting pipe 7. When the lower crushing chamber 5 is in the working position and connected with the feed channel 2 and the air intake nozzle 3, the opening and closing plates 101 open the connecting pipe 7 so that the powder can enter the interior of the classifier 4 through the upper crushing chamber 5. When the upper crushing chamber 5 is in the working position and connected with the feed channel 2 and the air intake nozzle 3, the opening and closing plates 101 close the connecting pipe 7 to prevent the powder in the upper crushing chamber 5 from entering the lower crushing chamber 5.

[0056] like Figures 4 to 7As shown, the wall-sticking cleaning component is used to clean the materials adhered to the inner wall of the crushing chamber 5. The wall-sticking cleaning component includes a cleaning ring 201 and a purge nozzle 202. The cleaning ring 201 can be lifted and arranged inside the crushing chamber 5. The cleaning ring 201 is connected to the air inlet pipe 203. The purge nozzle 202 is provided with a plurality of purge nozzles. The purge nozzle 202 is connected to the cleaning ring 201. In order to realize the lifting and lowering of the cleaning ring 201, a lifting mechanism is also included. The lifting mechanism is used to drive the cleaning ring 201 to lift and lower. The lifting mechanism includes a driving pipe 301, a telescopic pipe 302 and a reset spring The return spring 303 is arranged inside the telescopic tube 302, and the cleaning ring 201 is connected to the driving tube 301 through the return spring 303. The air inlet pipe 203 and the air supply pipe 304 are connected to the air supply device. One of the crushing chambers 5 moves to the working position, and the other one moves to the working position. The grinding chamber 5 moves to the rest position, so that the air inlet pipe 203 and the air supply pipe 304 corresponding to the grinding chamber 5 in the rest position are connected with the air supply device, and the air supply device supplies air to the cleaning ring 201 and the purge nozzle 202 through the air inlet pipe 203. The purge nozzle 202 is provided with a one-way valve, which blows air to the inner wall of the grinding chamber 5 to purge it, blows off the materials adhered to the surface, and supplies air to the inside of the driving tube 301 through the air supply pipe 304, thereby supplying air to the inside of the telescopic tube 302, so that the telescopic tube 302 is extended, driving the cleaning ring 201 to move, and After a certain period of time or when the cleaning ring 201 moves to the side of the crushing chamber 5 away from the driving tube 301, the air supply to the inside of the driving tube 301 is stopped, and the air supply pipe 304 can be connected to the dual-purpose air pump. The dual-purpose air pump can supply or inhale air to the inside of the air supply pipe 304. The dual-purpose air pump inhales air into the air supply pipe 304 to shrink the telescopic tube 302. At the same time, with the assistance of the return spring 303, the cleaning ring 201 is restored to its original position, that is, the position close to the driving tube 301, thereby reducing the obstruction of the telescopic tube 302 and the cleaning ring 201 to the crushing work.

[0057] like Figures 1 to 6As shown, in order to reduce the high temperature damage of the crushing chamber 5, a cooling component is also included, and the cooling component includes a cold water bin 401 and a cooling pipe 402. The cold water bin 401 is wrapped around the outside of the machine body 1, and the cooling pipe 402 is arranged inside the cold water bin 401. The cleaning ring 201 is connected to the cooling pipe 402. A connecting pipe is arranged on the crushing chamber 5. The connecting pipe is connected to the cleaning ring 201 through a telescopic hose. The end of the connecting pipe away from the cleaning pipe is connected to the cooling pipe 402 through a telescopic hose. The lifting and lowering of the crushing chamber 5 and the lifting and lowering of the cleaning ring 201 are adapted through the two telescopic hoses. The cooling pipe 402 is connected to the air intake pipe 203. The cold water bin 401 is wrapped around the outside of the machine body 1, and the cooling pipe 402 is arranged inside the cold water bin 401. The cleaning ring 201 is connected to the cooling pipe 402. The crushing chamber 5 is provided with a connecting pipe. The connecting pipe is connected to the cleaning ring 201 through a telescopic hose. The end of the connecting pipe away from the cleaning pipe is connected to the cooling pipe 402 through a telescopic hose. The two telescopic hoses are adapted to the lifting and lowering of the crushing chamber 5 and the cleaning ring 201. The cooling pipe 402 is connected to the air intake pipe 203. 1 is connected with a water inlet pipe and a water outlet pipe, and the water inlet pipe can be connected with a faucet or a refrigeration device to transport cold water to the inside of the cold water bin 401 to cool the surface of the machine body 1, thereby cooling the grinding chamber 5, reducing the high-temperature damage caused by the grinding chamber 5 and other components working for a long time, especially the friction with the material. The gas in the air inlet pipe 203 first enters the inside of the cooling pipe 402, and the cold water cools the gas in the cooling pipe 402. The cooled gas is blown into the inside of the grinding chamber 5 through the cleaning ring 201 and the purge nozzle 202, further improving the cooling effect on the grinding chamber 5 and reducing its high-temperature damage.

[0058] like Figures 4 to 5 As shown, in order to reduce the impact on the inner wall of the crushing chamber 5, a protective component is also included, and the protective component includes an inner liner 501. A plurality of inner liners 501 are provided. The inner liner 501 and the crushing chamber 5 are in sliding cooperation. The inner liner 501 contacts the inner wall of the crushing chamber 5. The plurality of inner liners 501 form a cylindrical shape that matches the inner wall of the crushing chamber 5. A slider is provided on the inner liner 501, and a slide groove that matches the slider is provided on the crushing chamber 5. The sliding cooperation between the slider and the slide groove can realize the convenient disassembly and assembly of the inner liner 501, and at the same time, the inner liner 501 is limited so that the plurality of inner liners 501 fits with the inner wall of the crushing chamber 5 to protect the inner wall of the crushing chamber 5.

[0059] like Figures 4 to 5As shown, in order to replace the liner 501, a replacement assembly is also included, and the replacement assembly includes a rotating ring 601, a replacement plate 602 and a disassembly plate 603. Two rotating rings 601 are provided, and the two rotating rings 601 are respectively rotatably arranged on the sides of the two crushing chambers 5 away from each other. A replacement port is opened on the rotating ring 601, and the size of the replacement port is adapted to the size of the liner 501. The replacement plate 602 is detachably arranged at the replacement port, and two disassembly ports are opened on the body 1. The disassembly plate 603 is detachably arranged at the disassembly port, and the two disassembly ports and the two crushing chambers 5 are in a resting state. Correspondingly, the disassembly port is opened by the disassembly plate 603, and the swivel 601 can be rotated, so that the liner 501 is tightly attached to the inner top wall and the inner bottom wall of the crushing chamber 5, and the inner liner 501 is limited, while preventing the powder from entering the gap between the liner 501 and the crushing chamber 5. The replacement plate 602 is opened, and the replacement port is rotated to the position corresponding to the liner 501, so that the liner 501 can be taken out from the inside of the crushing chamber 5, thereby replacing the liner 501. By using multiple liners 501, it is avoided that the liner 501 needs to be replaced as a whole after one part is damaged, thereby reducing the cost of use.

[0060] The working principle or use process of the air-controlled mill for preparing the grain nutrient powder is as follows:

[0061] The grains are added into the feeding channel through the feeding hopper 10, and the high-pressure airflow is introduced into the air-injection pipe 11 to spray the materials in the feeding channel into the grinding chamber 5. The high-pressure airflow is introduced into the grinding chamber 5 through the air inlet nozzle 3 to form a high-speed swirl. The grains are driven by the high-pressure swirl to circulate, and the grains and the liner 501 are constantly impacted, collided and rubbed to crush the grains.

[0062] The crushed grain particles enter the classifier 4 under the suction force of the classifier 4, the fine particles are extracted and collected, and the large particles are blocked by the classifier 4 and fall into the crushing chamber 5 for re-crushing;

[0063] After a certain period of time, stop adding materials to the feeding channel and stop the entry of high-pressure airflow, start the electric cylinder 1 8 to drive the two crushing chambers 5 to rise and fall, so that the other crushing chamber 5 moves to the working position and is connected to the feeding channel 2 and the air intake nozzle 3, and the feeding channel 2 continues to transport grains into the crushing chamber 5;

[0064] The air inlet pipe 203 and the air delivery pipe 304 corresponding to the pulverizing chamber 5 in the rest position are connected to the air delivery device and the dual-purpose air pump respectively. The air delivery device delivers air to the inside of the cleaning ring 201, and the surface of the liner 501 is purged through the purging nozzle 202. The dual-purpose air pump delivers air to the driving pipe 301, drives the telescopic pipe 302 to extend, drives the cleaning ring 201 and the purging nozzle to rise and fall, and after a certain period of time, the dual-purpose air pump sucks air into the driving pipe 301, causes the telescopic pipe 302 to contract, and drives the cleaning ring 201 to move to the original position under the action of the reset spring 303;

[0065] When the liner 501 needs to be replaced, open the disassembly plate 603 and the replacement plate 602, rotate the rotating ring 601 to rotate the replacement port to the liner 501 that needs to be replaced, take out the liner 501 from the inside of the crushing chamber 5, install the replaced liner 501 into the crushing chamber 5, and install the replacement plate 602 and the disassembly plate 603.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air-controlled mill for preparing nutritious grain powder, comprising a machine body (1), a feed channel (2) and a plurality of air inlet nozzles (3), wherein the top of the machine body (1) is connected to a classifier (4), characterized in that: It also comprises a crushing chamber (5), a telescopic discharge pipe (6), an opening and closing assembly and a wall-sticking cleaning assembly. The crushing chamber (5) is provided with two, the two crushing chambers (5) are connected via a connecting pipe (7), the crushing chamber (5) is arranged inside the machine body (1) in a manner that allows it to be lifted and lowered, the crushing chamber (5) is provided with a feed port matching the feed channel (2) and a plurality of air inlets matching the air inlet nozzles (3); the top of the crushing chamber (5) located above is connected to the classifier (4) via the telescopic discharge pipe (6); the opening and closing assembly is used to open and close the connecting pipe (7); the wall-sticking cleaning assembly is used to clean the material adhered to the inner wall of the crushing chamber (5), the wall-sticking cleaning assembly comprises a cleaning ring (201) and a purge nozzle (202), the cleaning ring (201) is arranged inside the crushing chamber (5) in a manner that allows it to be lifted and lowered, the cleaning ring (201) is connected to the air inlet pipe (203), the purge nozzle (202) is provided with ... cleaning ring (202) is provided with a cleaning ring (201) and a cleaning ring (202) is provided with a cleaning ring (201) and a cleaning ring (202) is provided with a cleaning ring (201) and a cleaning ring (202) is provided with a cleaning ring (201) and a cleaning ring (202) is provided with a cleaning ring (201) and a cleaning ring (202) is provided with a cleaning ring (201) and a cleaning ring (202) 02) is provided with a plurality of them, the purge nozzle (202) is connected to the cleaning ring (201), and also includes a lifting mechanism, the lifting mechanism is used to drive the cleaning ring (201) to be lifted and lowered, the lifting mechanism includes a driving tube (301), a telescopic tube (302) and a return spring (303), two driving tubes (301) are provided, the two driving tubes (301) are respectively arranged on the sides of the two crushing chambers (5) that are away from each other, the driving tube (301) is connected to an air supply tube (304), the cleaning ring (201) is connected to the driving tube (301) through the telescopic tube (302), the return spring (303) is arranged inside the telescopic tube (302), the cleaning ring (201) is connected to the driving tube (301) through the return spring (303), and the two crushing chambers (5) are alternately operated by lifting and lowering the crushing chamber (5), so as to prevent the same crushing chamber (5) from being in an operating state for a long time.

2. The air-controlled mill for preparing the coarse grain nutrient powder according to claim 1, characterized in that: It also includes a cooling component, the cooling component including a cold water bin (401) and a cooling pipe (402), the cold water bin (401) is wrapped around the outside of the machine body (1), the cooling pipe (402) is arranged inside the cold water bin (401), the cleaning ring (201) is connected to the cooling pipe (402), and the cooling pipe (402) is connected to the air intake pipe (203).

3. The air-controlled mill for preparing the coarse grain nutrient powder according to claim 2, characterized in that: It also comprises a protection component, the protection component comprising an inner liner (501), a plurality of the inner liners (501) being provided, the inner liner (501) and the pulverizing chamber (5) being in sliding fit, the inner liner (501) being in contact with the inner wall of the pulverizing chamber (5), and the plurality of the inner liners (501) forming a cylindrical shape matching the inner wall of the pulverizing chamber (5).

4. The air-controlled mill for preparing the coarse grain nutrient powder according to claim 3, characterized in that: It also comprises a replacement component, the replacement component comprising a rotating ring (601), a replacement plate (602) and a disassembly plate (603), two rotating rings (601) are provided, the two rotating rings (601) are respectively rotatably arranged on the sides of the two pulverizing chambers (5) away from each other, a replacement opening is provided on the rotating ring (601), the size of the replacement opening is adapted to the size of the liner (501), the replacement plate (602) is detachably arranged at the replacement opening, two disassembly openings are provided on the machine body (1), and the disassembly plate (603) is detachably arranged at the disassembly openings.

5. The air-controlled mill for preparing the coarse grain nutrient powder according to claim 4, characterized in that: The opening and closing assembly comprises an opening and closing plate (101), two of which are provided, and the opening and closing plate (101) is movably provided between the two pulverizing chambers (5), and the opening and closing plate (101) and the connecting pipe (7) are in sliding cooperation.

6. The air-controlled mill for preparing the coarse grain nutrient powder according to claim 5, characterized in that: A retaining ring (9) is provided between the two crushing chambers (5); the outer wall of the retaining ring (9) is flush with the outer wall of the crushing chamber (5); and the retaining ring (9) and the inner wall of the machine body (1) are in sealing and sliding fit.

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