CN219559904U - Wettable powder fluidized bed type jet mill - Google Patents

Abstract

The utility model relates to the technical field of crushing devices, in particular to a wettable powder fluidized bed type jet crushing device, which introduces substandard material particles into an air supply pipe to accelerate collision again, so that the efficiency of cyclic crushing is improved; the device comprises a hopper, wherein the hopper is arranged at the upper part of an air bag, two sealing valves are arranged at the lower part of the hopper, an air supply pipe is connected with the air bag and an air ring, a plurality of spray pipes are arranged at the output end of the air ring, the output ends of the spray pipes extend into the bottom of a crushing cavity of a crushing chamber, and air flows sprayed by the spray pipes are converged at the center of the bottom of the crushing chamber; still include collecting vat, material bucket and valve, the well upper portion that crushing room set up compares the bottom diameter and enlarges, and crushing room's middle part is provided with annular collecting vat, and the collecting vat is used for collecting the large granule that falls and does not reach standard, and the output of collecting vat is connected with the input of material bucket, and the output and the air supply pipe intercommunication of material bucket, the valve is all installed to the input and the output of material bucket.

Description

Wettable powder fluidized bed type jet mill

Technical Field

The utility model relates to the technical field of crushing devices, in particular to a wettable powder fluidized bed type jet crushing device.

Background

The fluidized bed jet mill is characterized in that compressed air is frozen, filtered and dried, supersonic air flow is formed through nozzles and is injected into a crushing chamber, so that materials are fluidized, and the accelerated materials are converged at the jet air flow intersection points of a plurality of nozzles to generate severe collision, friction and shearing so as to achieve superfine crushing of particles.

The fluidized bed type jet mill provided by the Chinese patent application with the publication number of CN114713349A in the prior art integrates differential pressure crushing and gas explosion crushing, and the mill has more than 2 crushing processes in the crushing process under the same energy consumption working condition, so that the capacity is greatly improved under the condition of the same energy consumption. The device is the same with the working mode of a traditional fluidized bed type jet mill, namely, large particles which do not reach standards in the milling process can circularly flow in a cavity of the mill, and are accelerated to collide and mill again after falling into jet air flows of a plurality of nozzles to form repeated circular milling, but the large particles can only enter the edge of the jet air flows when circulating in the mill, the acceleration time is short, the large particles cannot be accelerated to a high enough speed, and the efficiency of the circular milling is low.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the wettable powder fluidized bed type jet milling device which introduces substandard material particles into an air supply pipe to accelerate collision again and improves the efficiency of circulating milling.

The utility model relates to a wettable powder fluidized bed type jet mill, which comprises a hopper, an air bag, an air supply pipe, an air ring, spray pipes and a mill chamber, wherein the hopper is arranged at the upper part of the air bag, the hopper is communicated with the air bag, two sealing valves are arranged at the lower part of the hopper, the input end of the air supply pipe is connected with the output end of the air bag, the output end of the air supply pipe is connected with the input end of the air ring, a plurality of spray pipes are arranged at the output end of the air ring, the output ends of the spray pipes extend into the bottom of the mill chamber, and the air flows sprayed by the spray pipes are converged at the center of the bottom of the mill chamber; the device comprises a crushing chamber, a collecting tank, a material barrel and a valve, wherein the diameter of the middle upper part of the crushing chamber is enlarged compared with that of the bottom part, the middle part of the crushing chamber is provided with an annular collecting tank, the collecting tank is used for collecting falling large particles which are not up to standard, the output end of the collecting tank is connected with the input end of the material barrel, the output end of the material barrel is communicated with an air supply pipe, and the valves are arranged at the input end and the output end of the material barrel; the input of during operation air pocket is connected with external high-pressure air system, the material is added in the hopper, open and close two sealing valves of hopper in turn, make the material get into between two sealing valves, open the material valve of below and make the material get into the air pocket in, the air current drives the material and spouts the crushing cavity bottom of crushing room and meet in the department of central authorities through gas supply pipe, gaseous ring and a plurality of spray tubes, the material that is driven by high-speed air current bumps back and smashes, the material granule that is smashed rises along the air current, the tiny particle that reaches standard is sifted by the grading mechanism at crushing room top and is discharged next station, the tiny particle that does not reach standard follows circulating air current flows down along the edge of crushing cavity of crushing room and gets into the collecting vat, the tiny particle material that collects in the collecting vat gets into the material basket, when the material in the material basket piles up to a certain volume, the valve on the input of material basket is closed, the valve on the output of material basket is opened, the tiny particle material in the gas supply pipe gets into, make tiny particle material in following the air current in the gas supply pipe and rise, the air current in the gas supply pipe, the air current in the multiple spray tubes is carried out in the high-speed circulation efficiency when smashing the crushing room is carried out in the high-speed collision outside the air current, thereby realizing the high-speed circulation, the outside is achieved.

Preferably, the device further comprises a flow guide pipe, wherein the flow guide pipe is arranged in the middle of the crushing chamber, the lower end of the flow guide pipe is connected with the bottom wall of the collecting tank, the inner channel of the flow guide pipe guides crushed materials upwards along the middle of the crushing chamber, and the outer wall of the flow guide pipe guides falling large-particle materials into the collecting tank; the efficiency of collecting large granule material in collecting vat is improved through the water conservancy diversion effect of honeycomb duct.

Preferably, the device further comprises a lantern ring, a plurality of pushing plates, a gear ring, a pushing motor and a pushing gear, wherein the lantern ring is rotatably arranged on the outer wall of the flow guide pipe, the plurality of pushing plates are uniformly arranged on the outer wall of the lantern ring, the plurality of pushing plates extend into the collecting tank, the gear ring is concentrically arranged on the outer wall of the lantern ring, the pushing motor is arranged on the outer wall of the crushing chamber, the pushing gear is concentrically arranged on the output shaft of the pushing motor, the pushing gear is meshed with the gear ring for transmission, and a bearing and a sealing assembly are arranged between the output shaft of the pushing motor and the side wall of the crushing chamber; the pushing motor drives the pushing gear to rotate, the pushing gear drives the gear ring to rotate, the gear ring drives the lantern ring and the pushing plates to rotate on the guide pipe, so that the pushing plates push large-particle materials gathered in the collecting tank into the material barrel, the discharging efficiency of the materials is improved, and the material circulation is facilitated.

Preferably, the plurality of pushing plates are obliquely arranged, and the plurality of pushing plates are obliquely arranged in the opposite direction of the rotating direction; the plurality of inclined pushing plates are beneficial to guiding and pushing the large-particle materials in the collecting tank to the edge of the collecting tank and feeding the large-particle materials into the material barrel.

Preferably, the stirring device further comprises a stirrer, a plurality of stirring rods, a gear shaft, a stirring motor and a driving bevel gear, wherein the stirrer is positioned between two sealing valves of the hopper, the plurality of stirring rods are arranged on the stirrer, the gear shaft is arranged in the middle of the stirrer, the bevel gear is arranged on the gear shaft, the gear shaft is rotatably arranged on the inner wall of the hopper through a bracket, the stirring motor is arranged on the outer wall of the hopper, the driving bevel gear is concentrically arranged on an output shaft of the stirring motor, the driving bevel gear is meshed with the bevel gear of the gear shaft, and a bearing and sealing assembly are arranged between the output shaft of the stirring motor and the hopper; the stirring motor drives the drive bevel gear to rotate, the drive bevel gear drives the gear shaft to rotate, the gear shaft drives the stirrer and the stirring rods to rotate, materials between two sealing valves of the hopper are stirred, the wet materials are scattered, and wet material adhesion caking is avoided.

Preferably, the device further comprises a classifying chamber, a classifying motor and a classifier, wherein the classifying chamber is arranged at the top of the crushing chamber, the input end of the classifying chamber is communicated with the crushing chamber of the crushing chamber, the classifying motor is arranged on the outer wall of the classifying chamber, the classifier is arranged on the output shaft of the classifying motor and is positioned in the classifying chamber, the interior of the classifier is communicated with the output end of the classifying chamber, and a bearing and sealing assembly are arranged between the output shaft of the classifying motor and the classifying chamber; the classifier is driven by the classifying motor to rotate at a high speed, the rotating classifier sieves and classifies the material powder rising along with the airflow, the particles reaching the standards are discharged into the next procedure through the classifier and the output end of the classifying chamber, and the particles not reaching the standards are intercepted by the classifier and fall back into the collecting tank, so that classification of the material particles is realized.

Compared with the prior art, the utility model has the beneficial effects that: the input of during operation air pocket is connected with external high-pressure air system, the material is added in the hopper, open and close two sealing valves of hopper in turn, make the material get into between two sealing valves, open the material valve of below and make the material get into the air pocket in, the air current drives the material and spouts the crushing cavity bottom of crushing room and meet in the department of central authorities through gas supply pipe, gaseous ring and a plurality of spray tubes, the material that is driven by high-speed air current bumps back and smashes, the material granule that is smashed rises along the air current, the tiny particle that reaches standard is sifted by the grading mechanism at crushing room top and is discharged next station, the tiny particle that does not reach standard follows circulating air current flows down along the edge of crushing cavity of crushing room and gets into the collecting vat, the tiny particle material that collects in the collecting vat gets into the material basket, when the material in the material basket piles up to a certain volume, the valve on the input of material basket is closed, the valve on the output of material basket is opened, the tiny particle material in the gas supply pipe gets into, make tiny particle material in following the air current in the gas supply pipe and rise, the air current in the gas supply pipe, the air current in the multiple spray tubes is carried out in the high-speed circulation efficiency when smashing the crushing room is carried out in the high-speed collision outside the air current, thereby realizing the high-speed circulation, the outside is achieved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic cross-sectional view of the present utility model;

FIG. 3 is a schematic illustration of an axially measured structure of the present utility model;

FIG. 4 is a schematic view of the structure of a hopper, a gas bag, a gas supply pipe, a stirrer, a stirring motor and the like;

FIG. 5 is a schematic structural view of the crushing chamber, the collecting tank, the flow guide pipe, the lantern ring, the push plate, the gear ring, the pushing motor and the like;

the reference numerals in the drawings: 1. a hopper; 2. an air bag; 3. an air supply pipe; 4. a gas ring; 5. a spray pipe; 6. a pulverizing chamber; 7. a collection tank; 8. a material barrel; 9. a valve; 10. a flow guiding pipe; 11. a collar; 12. a push plate; 13. a gear ring; 14. a pushing motor; 15. a pushing gear; 16. a stirrer; 17. a stirring rod; 18. a gear shaft; 19. a stirring motor; 20. a drive bevel gear; 21. a classifying chamber; 22. a classifying motor; 23. a classifier.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. This utility model may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Example 1

As shown in fig. 1 to 5, a fluid bed type jet mill for wettable powder comprises a hopper 1, an air bag 2, an air supply pipe 3, an air ring 4, jet pipes 5 and a mill chamber 6, wherein the hopper 1 is arranged at the upper part of the air bag 2, the hopper 1 is communicated with the air bag 2, two sealing valves are arranged at the lower part of the hopper 1, the input end of the air supply pipe 3 is connected with the output end of the air bag 2, the output end of the air supply pipe 3 is connected with the input end of the air ring 4, the output end of the air ring 4 is provided with a plurality of jet pipes 5, the output ends of the jet pipes 5 extend into the bottom of the mill chamber 6, and the jet flows sprayed by the jet pipes 5 are intersected at the center of the bottom of the mill chamber 6; the device also comprises a collecting tank 7, a material barrel 8 and a valve 9, wherein the diameter of the middle upper part of the crushing chamber 6 is enlarged compared with that of the bottom part, the middle part of the crushing chamber 6 is provided with an annular collecting tank 7, the collecting tank 7 is used for collecting falling large particles which are not up to standard, the output end of the collecting tank 7 is connected with the input end of the material barrel 8, the output end of the material barrel 8 is communicated with the air supply pipe 3, and the valve 9 is arranged at the input end and the output end of the material barrel 8; the device further comprises a guide pipe 10, wherein the guide pipe 10 is arranged in the middle of the crushing chamber 6, the lower end of the guide pipe 10 is connected with the bottom wall of the collecting tank 7, the inner channel of the guide pipe 10 guides crushed materials upwards along the middle of the crushing chamber 6, and the outer wall of the guide pipe 10 guides falling large-particle materials into the collecting tank 7; the device comprises a honeycomb duct 10, a collecting tank 7, a plurality of push plates 12, a gear ring 13, a pushing motor 14 and a pushing gear 15, wherein the push plates 12 are uniformly arranged on the outer wall of the honeycomb duct 10, the push plates 12 extend into the collecting tank 7, the gear ring 13 is concentrically arranged on the outer wall of the push plates 11, the pushing motor 14 is arranged on the outer wall of the crushing chamber 6, the pushing gear 15 is concentrically arranged on an output shaft of the pushing motor 14, the pushing gear 15 is in meshed transmission with the gear ring 13, and a bearing and sealing assembly are arranged between the output shaft of the pushing motor 14 and the side wall of the crushing chamber 6; the plurality of push plates 12 are all arranged obliquely, and the plurality of push plates 12 are all inclined in the direction opposite to the rotation direction.

The input end of the air bag 2 is connected with an external high-pressure air system when the air bag is in operation, materials are added into the hopper 1, two sealing valves of the hopper 1 are alternately opened and closed, materials enter between the two sealing valves, the lower material valve is opened, the materials enter the air bag 2, the air flow drives the materials to be sprayed into the bottom of a crushing cavity of the crushing cavity 6 through the air supply pipe 3, the air ring 4 and the spray pipes 5 and meet at the center, the materials driven by the high-speed air flow collide and then crushed, the flow guide crushed materials and particles entering through the spray pipes 10 rise along the air flow, the small particles reaching standards are screened by a classifying mechanism at the top of the crushing cavity 6 and discharged into the next station, the substandard large particles follow circulating air flow flows downwards along the edge of the crushing cavity 6 through the spray pipes 10 and enter into the collecting tank 7, the pushing motor 14 drives the pushing gear 15 to rotate, the gear ring 13 drives the lantern ring 11 and the push plates 12 to rotate on the push plates 10, the large particles gathered in the collecting tank 7 are pushed into the material bucket 8 through the air supply pipe 3, the efficiency of the large particles in the collecting tank 8 is improved, the large particles in the air flow guide pipe 8 are discharged from the air guide pipe 8 and the air guide pipe 8 collide with the large particles entering through the air guide pipe 8, the air guide pipe 8 and the air guide pipe 8 is discharged from the air inlet end of the air inlet 7, the large particles enter into the collecting tank 8 through the sealing cavity 8, and the sealing valve is closed, and the high-speed circulation efficiency is increased, and the material is realized, and the high efficiency is realized when the particles in the material is discharged into the air flow 3 and the air guide pipe 8 and the air guide valve is discharged through the air flow and the high-filled through the air guide valve and the air pump 8 and then the high-filled through the air pump 3 and then flows and then the high up and then after the high-speed crushed in the air circulation.

Example 2

As shown in fig. 1, 2 and 4, the fluid bed type jet mill for wettable powder comprises a hopper 1, an air bag 2, an air supply pipe 3, an air ring 4, jet pipes 5 and a milling chamber 6, wherein the hopper 1 is arranged at the upper part of the air bag 2, the hopper 1 is communicated with the air bag 2, two sealing valves are arranged at the lower part of the hopper 1, the input end of the air supply pipe 3 is connected with the output end of the air bag 2, the output end of the air supply pipe 3 is connected with the input end of the air ring 4, the output end of the air ring 4 is provided with a plurality of jet pipes 5, the output ends of the jet pipes 5 extend into the bottom of the milling chamber 6, and the air flows ejected by the jet pipes 5 are converged at the center of the bottom of the milling chamber 6; the device also comprises a collecting tank 7, a material barrel 8 and a valve 9, wherein the diameter of the middle upper part of the crushing chamber 6 is enlarged compared with that of the bottom part, the middle part of the crushing chamber 6 is provided with an annular collecting tank 7, the collecting tank 7 is used for collecting falling large particles which are not up to standard, the output end of the collecting tank 7 is connected with the input end of the material barrel 8, the output end of the material barrel 8 is communicated with the air supply pipe 3, and the valve 9 is arranged at the input end and the output end of the material barrel 8; the stirring device comprises a hopper 1, a stirring motor 19, a stirring rod 17, a gear shaft 18, a stirring motor 20 and a driving bevel gear 20, wherein the stirring motor 16 is positioned between two sealing valves of the hopper 1, the stirring rod 17 is arranged on the stirring motor 16, the middle part of the stirring motor 16 is provided with the gear shaft 18, the gear shaft 18 is provided with the bevel gear, the gear shaft 18 is rotatably arranged on the inner wall of the hopper 1 through a bracket, the stirring motor 19 is arranged on the outer wall of the hopper 1, the driving bevel gear 20 is concentrically arranged on an output shaft of the stirring motor 19, the driving bevel gear 20 is meshed with the bevel gear of the gear shaft 18, and a bearing and sealing assembly are arranged between the output shaft of the stirring motor 19 and the hopper 1; still include classifying chamber 21, classifying motor 22 and classifier 23, classifying chamber 21 installs at the top of smashing the room 6, classifying chamber 21's input and smashing the room intercommunication of room 6, classifying motor 22 installs on classifying chamber 21's outer wall, installs classifier 23 on classifying motor 22's the output shaft, and classifier 23 is arranged in classifying chamber 21, classifying motor 23's inside and classifying chamber 21's output intercommunication, classifying motor 22's output shaft and classifying chamber 21 between be provided with bearing and seal assembly.

The stirring motor 19 drives the drive bevel gear 20 to rotate when the hopper 1 feeds the air bag 2, the drive bevel gear 20 drives the gear shaft 18 to rotate, the gear shaft 18 drives the stirrer 16 and the stirring rods 17 to rotate, materials between two sealing valves of the hopper 1 are stirred, the wet materials are scattered, wet materials are prevented from adhering and agglomerating, the classifier 23 is driven to rotate at a high speed by the classifying motor 22 during operation, the powder of the materials rising along with air flow is sieved and classified by the rotating classifier 23, and particles reaching standards are discharged into the next procedure through the classifier 23 and the output end of the classifying chamber 21, and the particles not reaching standards are intercepted by the classifier 23 and fall back into the collecting tank 7, so that classification of the particles of the materials is realized.

As shown in fig. 1 to 5, in the wettable powder fluidized bed type jet mill disclosed by the utility model, when the jet mill works, firstly, the input end of a gas bag 2 is connected with an external high-pressure air system, materials are added into a hopper 1 in the working process, two sealing valves of the hopper 1 are alternately opened and closed, so that the materials enter between the two sealing valves, then the lower material valve is opened to enable the materials to enter the gas bag 2, the air flow drives the materials to be sprayed into the bottom of a grinding chamber 6 through an air supply pipe 3, an air ring 4 and a plurality of spray pipes 5 and are intersected at the center, the materials driven by high-speed air flow collide and are ground, then the ground material particles are guided and ascended by a guide pipe 10, small particles reaching the standard are sieved by a classifier 23 at the top of the grinding chamber 6 and are discharged to the next station, the substandard large particles follow the circulating air flow downwards along the edge of the grinding chamber 6 through the guide pipe 10 and enter a collecting tank 7, finally, the large particle materials collected in the collecting tank 7 are rotated by a plurality of push plates 12 to enter a material bucket 8, finally, when the materials in the material bucket 8 are sprayed into the material bucket 8 through the air ring 8, the valves 1 are opened, the large particle particles are sprayed into the material bucket 8 through the air ring 8 and the air inlet valve 9 is closed, and the material particles are discharged into the material bucket 8 through the air inlet end 9 after the high-speed collision valve 1, and the material particles are discharged into the air bucket 8, and finally, and the material particles are discharged into the material bucket 8 through the air bucket 3.

The main functions realized by the utility model are as follows:

1. external circulation acceleration is realized, and the speed during collision is higher than that of the traditional internal circulation jet mill, so that the efficiency of circulation crushing is improved;

2. the ascending material air flow and the descending material air flow can be separated, and the interference of the descending material air flow to the intersection air flow is reduced.

The installation mode, the connection mode or the setting mode of the wettable powder fluidized bed type jet mill are all common mechanical modes, and the installation mode, the connection mode or the setting mode can be implemented as long as the beneficial effects can be achieved; the hopper 1, the air bag 2, the air supply pipe 3, the air ring 4, the spray pipe 5, the crushing chamber 6, the valve 9, the gear ring 13, the pushing motor 14, the pushing gear 15, the gear shaft 18, the stirring motor 19, the driving bevel gear 20, the classifying chamber 21, the classifying motor 22 and the classifier 23 of the wettable powder fluidized bed type jet mill device are purchased in the market, and can be installed and operated by a person skilled in the art according to the attached using instruction without creative labor of the person skilled in the art.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (6)

1. The utility model provides a wettable powder fluidized bed type jet milling device, including hopper (1), air pocket (2), air pipe (3), gaseous ring (4), spray tube (5) and crushing room (6), hopper (1) are installed in the upper portion of air pocket (2), hopper (1) and air pocket (2) intercommunication, the lower part of hopper (1) is provided with two sealing valves, the input of air pipe (3) is connected with the output of air pocket (2), the output of air pipe (3) is connected with the input of gaseous ring (4), a plurality of spray tubes (5) are installed to the output of gaseous ring (4), the output of a plurality of spray tubes (5) all stretches into crushing cavity bottom of crushing room (6), the air current of a plurality of spray tubes (5) blowout crosses in the bottom central authorities of crushing room (6); the novel crushing device is characterized by further comprising a collecting tank (7), a material barrel (8) and a valve (9), wherein the diameter of the middle upper part of the crushing chamber (6) is enlarged compared with that of the bottom, the annular collecting tank (7) is arranged in the middle of the crushing chamber (6), the collecting tank (7) is used for collecting falling large particles which are not up to standard, the output end of the collecting tank (7) is connected with the input end of the material barrel (8), the output end of the material barrel (8) is communicated with the air supply pipe (3), and the valve (9) is arranged at the input end and the output end of the material barrel (8).

2. The fluid bed type jet mill for wettable powder as claimed in claim 1, further comprising a guide pipe (10), wherein the guide pipe (10) is installed at the middle part of the milling chamber (6), the lower end of the guide pipe (10) is connected with the bottom wall of the collecting tank (7), the inner channel of the guide pipe (10) guides the milled material upwards along the middle part of the milling chamber (6), and the outer wall of the guide pipe (10) guides the fallen large particle material into the collecting tank (7).

3. The fluid bed type jet mill for wettable powder according to claim 2, further comprising a sleeve ring (11), a plurality of push plates (12), a gear ring (13), a pushing motor (14) and a pushing gear (15), wherein the sleeve ring (11) is rotatably installed on the outer wall of the flow guide pipe (10), the plurality of push plates (12) are uniformly installed on the outer wall of the sleeve ring (11), the plurality of push plates (12) are all extended into the collecting tank (7), the gear ring (13) is concentrically installed on the outer wall of the sleeve ring (11), the pushing motor (14) is installed on the outer wall of the milling chamber (6), the pushing gear (15) is concentrically installed on the output shaft of the pushing motor (14), the pushing gear (15) is in meshed transmission with the gear ring (13), and a bearing and sealing assembly is arranged between the output shaft of the pushing motor (14) and the side wall of the milling chamber (6).

4. A fluid bed jet mill for wettable powders as claimed in claim 3 wherein the plurality of pusher plates (12) are each disposed obliquely and the plurality of pusher plates (12) are each inclined in a direction opposite to the direction of rotation.

5. The fluid bed jet mill for wettable powder as claimed in claim 1, further comprising a stirrer (16), a plurality of stirring rods (17), a gear shaft (18), a stirring motor (19) and a drive bevel gear (20), wherein the stirrer (16) is positioned between two sealing valves of the hopper (1), the stirring rods (17) are arranged on the stirrer (16), the gear shaft (18) is arranged in the middle of the stirrer (16), the bevel gear is arranged on the gear shaft (18), the gear shaft (18) is rotatably mounted on the inner wall of the hopper (1) through a bracket, the stirring motor (19) is mounted on the outer wall of the hopper (1), the drive bevel gear (20) is concentrically mounted on the output shaft of the stirring motor (19), the drive bevel gear (20) is meshed with the bevel gear of the gear shaft (18), and a bearing and sealing assembly is arranged between the output shaft of the stirring motor (19) and the hopper (1).

6. A fluid bed jet mill for wettable powders as claimed in claim 1 further comprising a classifying chamber (21), a classifying motor (22) and a classifier (23), the classifying chamber (21) being mounted on top of the pulverizing chamber (6), the input end of the classifying chamber (21) being in communication with the pulverizing chamber of the pulverizing chamber (6), the classifying motor (22) being mounted on the outer wall of the classifying chamber (21), the classifier (23) being mounted on the output shaft of the classifying motor (22), the classifier (23) being located in the classifying chamber (21), the interior of the classifier (23) being in communication with the output end of the classifying chamber (21), a bearing and sealing assembly being provided between the output shaft of the classifying motor (22) and the classifying chamber (21).