CN112844719A

CN112844719A - Air flow mill with multi-grinding-area structure

Info

Publication number: CN112844719A
Application number: CN202110049731.5A
Authority: CN
Inventors: 刘鸿刚; 刘树旭; 李激峰
Original assignee: Jilin Kewt Mechanical And Electrical Equipment Co ltd
Current assignee: Jilin Kewt Mechanical And Electrical Equipment Co ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2021-05-28

Abstract

The invention relates to a jet mill with a multi-grinding-area structure, which comprises a barrel, wherein the bottom of the barrel is fixedly connected with a lower grinding chamber, the lower grinding chamber comprises a cavity, a certain number of bottom nozzles and a certain number of side nozzles, one side of the cavity is provided with a side nozzle air inlet, four side spray cavities which are uniformly distributed along the circumference of the cavity are arranged in the cavity, three side nozzles are uniformly and fixedly connected on the circumference of the side spray cavities, the bottom end of each side spray cavity is vertically and fixedly connected with a bottom nozzle, and the upper part of each bottom nozzle is provided with a bottom nozzle air inlet. The control to the particle size distribution is improved, and the grinding degree of the powder is enhanced.

Description

Air flow mill with multi-grinding-area structure

Technical Field

The invention relates to the field of powder milling of an airflow mill in the powder metallurgy industry, in particular to an airflow mill with a multi-grinding-area structure.

Background

In the powder process of the powder metallurgy industry, the jet mill is a key powder making device. The milling chamber of the jet mill is the core mechanism of the jet mill. The material is fed into hopper, fed into grinding machine by means of feeder, the compressor provides high-pressure gas, then fed into grinding machine by means of cold drying machine and pipeline valve, the high-pressure gas is sprayed into grinding machine by means of supersonic speed, and the material particles are sprayed toward the convergence point of gas flow by means of the carrying action of compressed high-speed gas flow so as to make the particles produce impact and collision with each other to attain the goal of pulverizing. The development and the use of powder process trade jet mill room have been very ripe at present, and mill the room size and be big more, can influence particle size distribution, to the concentrated control difficulty of particle size distribution, the produced impact force collision area of collection point is great, and is difficult to control the powder crushing degree, grinds the room size undersize, and the efficiency of processing is also low excessively. Because of the limitation of the above conditions, the diameter of the grinding chamber is not changed on the existing basis, the particle size distribution centralization is improved, the discharging efficiency is controlled, and the existing grinding and grinding chamber is correspondingly improved and designed.

In summary, a new jet mill structure needs to be invented to achieve the efficient grinding of powder and the control of particle size concentration.

Disclosure of Invention

The invention aims to provide a multi-grinding-area structure jet mill, which is internally designed into a multi-grinding-area structure and can improve the control of the particle size distribution of powder and the discharge efficiency.

In order to achieve the above purpose, the following technical scheme is provided:

many grind district's structure jet mill, the novel nipple rectifier comprises a cylindrical shel, the room is ground under the bottom fixedly connected with of barrel, grind the room down and include cavity, the end nozzle of a definite amount, the side nozzle of a definite amount, the top and the barrel fixed connection of cavity, and then realize the fixed connection who grinds room and barrel down, one side of cavity is equipped with the side nozzle air inlet, the inside of cavity is equipped with four side spray cavity along cavity border equipartition, every the top of side spray cavity respectively with barrel bottom fixed connection and switch on, the three side nozzle of border equipartition fixedly connected with on the side spray cavity, and the bottom nozzle of the vertical fixedly connected with in bottom of side spray cavity, every bottom nozzle upper portion all is equipped with an end nozzle air inlet.

Preferably, every three side nozzles, one bottom nozzle and one side spray cavity form a set of grinding area, the number of the grinding areas is more than or equal to two sets, and four sets are selected as the optimal selection.

Preferably, the central axes of the three side nozzles and the central axis of the bottom nozzle intersect at a point, and the intersection point is located at the lower part in the side nozzle cavity.

Preferably, the central axis of the bottom nozzle is collinear with the central axis of the corresponding side spray cavity, and the spatial included angles between the central axes of the three side nozzles and the central axis of the bottom nozzle are 30-60 °.

Preferably, the bottom center of the cylinder body is also provided with an upward convex cone.

The invention has the beneficial effects that:

the structure of the invention shortens the distance from the nozzle to the collection point, avoids the phenomenon of incomplete crushing granularity caused by over-long distance from the nozzle to the collection point, improves the control on the granularity distribution, enhances the grinding degree of powder in the grinding process, improves the control on the granularity distribution centralization and simultaneously improves the discharging efficiency compared with the original airflow mill because the grinding area is increased and is reduced from big to small.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a top view of the present invention;

the reference symbols shown in the figures are: 1-cylinder, 2-chamber, 3-bottom nozzle, 4-side nozzle, 5-side nozzle air inlet, 6-side spray cavity, 7-bottom nozzle air inlet, 8-cone.

Detailed Description

The following describes the present design in detail with reference to the accompanying drawings.

As shown in fig. 1-2, many grinding district's structure jet mills, including barrel 1, wherein the room is ground under the bottom fixedly connected with of barrel 1, it includes cavity 2 to grind the room down, bottom nozzle 3 of a certain amount, side nozzle 4 of a certain amount, cavity 2's top and barrel 1 fixed connection, and then realize the fixed connection of room and barrel 1 down, one side of cavity 2 is equipped with side nozzle air inlet 5, cavity 2's inside is equipped with along four side spray cavity 6 of 2 girth equipartitions of cavity, the top of every side spray cavity 6 respectively with switching on of barrel 1 bottom fixed connection and, it still encircles three side nozzle 4 of equipartition fixedly connected with on the cavity 6 to spout the side, and bottom nozzle 3 of the vertical fixedly connected with in bottom of cavity 6 is spouted to the side, every bottom nozzle 3 upper portion all is equipped with a bottom nozzle air inlet 7.

Wherein, every three side nozzles 4, one bottom nozzle 3 and one side spray cavity 6 form a set of grinding area, the number of the grinding areas is more than or equal to two sets, and four sets are selected optimally.

The central axes of the three side nozzles 4 and the central axis of the bottom nozzle 3 intersect at one point, and the intersection point is located at the lower part in the side spray cavity 6.

Wherein, the central axis of the bottom nozzle 3 is collinear with the central axis of the corresponding side spray cavity 6, and the spatial included angle between the central axes of the three side nozzles 4 and the central axis of the bottom nozzle 3 is 30-60 degrees.

Wherein, the bottom center of barrel 1 still is equipped with an upwards bellied cone 8, and the material in the barrel 1 of being convenient for gets into the grinding region under the effect of gravity, improves its machining efficiency.

Examples

As shown in figure 1, when the invention is applied, materials are added into a cylinder body 1, a plurality of sets of grinding areas are formed in a lower grinding chamber, each set of grinding area is respectively provided with three side nozzles 4 and a bottom nozzle 3, high-pressure gas is connected into four bottom jet gas supply pipes and one side jet gas supply pipe through a gas distribution tank, and the lower grinding chamber is supplied with gas through a bottom nozzle gas inlet 7 and a side nozzle gas inlet 5. High-pressure gas respectively passes through the bottom nozzle 3 and the side nozzle 4, the nozzles accelerate the gas, the high-pressure gas is sprayed into the side spray cavity 6 at supersonic speed, material particles are sprayed to an airflow convergence point at high speed by utilizing the carrying effect of compressed high-speed airflow, the particles and the particles are mutually impacted and collided to achieve crushing, and compared with the original airflow mill, the grinding area is reduced from large to small and increased in quantity, so that the distance from the nozzles to the convergence point is shortened, the control on particle size distribution is improved, and the grinding degree of powder is enhanced.

Claims

1. Many grinding district's structure air current grinds, including the barrel, its characterized in that, the room is ground under the bottom fixedly connected with of barrel, grind the room down and include cavity, the end nozzle of a definite amount, the side nozzle of a definite amount, the top and the barrel fixed connection of cavity, and then realize grinding the fixed connection of room and barrel down, one side of cavity is equipped with the side nozzle air inlet, the inside of cavity is equipped with four sides along cavity border equipartition and spouts the cavity, every the top that the cavity was spouted to the side is respectively with barrel bottom fixed connection and switch on, the side is spouted the three side nozzle of border equipartition fixedly connected with on the cavity, and the bottom nozzle of the vertical fixedly connected with in bottom of cavity, every is spouted to the side bottom nozzle upper portion all is equipped with a end nozzle air inlet.

2. The jet mill with the structure of the multiple grinding areas as claimed in claim 1, wherein every three side nozzles, one bottom nozzle and one side jet cavity form a set of grinding areas, the number of the grinding areas is more than or equal to two sets, and four sets are selected as the most preferable.

3. The multiple abrasive area structure jet mill of claim 2, wherein the central axes of the three side nozzles intersect the central axis of the bottom nozzle at a point, and the intersection point is located at a lower portion within the side nozzle cavity.

4. The multi-grinding-zone structure jet mill according to claim 2, wherein the central axis of the bottom nozzle is collinear with the central axis of the corresponding side-jet cavity, and the spatial included angles between the central axes of the three side nozzles and the central axis of the bottom nozzle are 30-60 °.

5. The multiple grinding zone structure jet mill according to claim 1, wherein the bottom center of the cylinder is further provided with an upward convex cone.