CN113145264A

CN113145264A - Feeding and washing and crushing structure of jet mill

Info

Publication number: CN113145264A
Application number: CN202110482034.9A
Authority: CN
Inventors: 杜军; 杜伊凡; 谢银
Original assignee: Nanjing Tianmu Ultramicro Technology Research Development Co ltd
Current assignee: Nanjing Tianmu Ultramicro Technology Research Development Co ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-07-23

Abstract

The invention relates to a feeding and washing structure of a jet milling classifier, belonging to a solid material crushing device. The jet mill has three areas, wherein the first area is a milling area which is provided with a milling device and a feeding device; the second zone is a fluidized bed zone and is provided with a bypass washing pipe; the third area is a grading area and is provided with a grading wheel. The feeding device is arranged above the airflow spray pipe, and the feeding pipe enters the crushing chamber. The mixed material to be crushed enters the crushing chamber and firstly enters the fluidization area under the guidance of the feeding pipe, so that the useless work of partial materials (qualified materials) is reduced. Meanwhile, the impact of the materials on the surface wall of the crushing chamber of the feeding pipe due to the inertia of the negative pressure suction of the crushing chamber when the materials enter the crushing chamber is avoided.

Description

Feeding and washing and crushing structure of jet mill

Technical Field

The invention relates to a solid material crushing device, in particular to a feeding, washing and crushing structure of a jet mill.

Background

The method is characterized in that the powder is crushed by taking airflow as power and driving the powder to move at high speed under the drive of high-speed airflow, and the particles collide at high speed.

The fluidized bed reverse collision type air flow crusher consists of material bin, material feeding system, supersonic air flow nozzle, crushing chamber, grading chamber, material outlet, etc. During crushing, the material is fed to the crushing chamber via the hopper, and the airflow enters the crushing chamber via the jet pipe. The material is accelerated by the jet pipe airflow and collides at the intersection point of the high-speed jet flow, and the point is positioned in the center of the crushing chamber, so that the crushed product rises to the classification zone through the fluidization zone along with the airflow and is classified by the upper classification wheel. Qualified powder particles enter the collector through the grading wheel, and tail gas enters the dust remover to be discharged. Unqualified products are blocked by the grader to fall back to the crushing chamber for crushing.

From the above structure and working principle of the apparatus, it can be seen that there are two sources of crushed material: firstly, powder enters a crushing chamber from a bin; and the second is powder blocked by the classifier and returned to the crushing chamber. In the first condition, powder enters the crushing chamber, is driven by high-speed airflow ejected by the nozzle to move towards the intersection point of the jet flow along with the airflow, has certain energy impact force after accelerated movement, and collides with materials moving in opposite directions to realize crushing. In the second case, the crushed products rise with the airflow and are treated by a classifier at the upper part of the equipment, and qualified products are discharged by the classifier; the off-spec product is blocked by the classifier from falling back into the crushing chamber.

Generally, the material to be micronized needs to be pre-pulverized to 80-100 mesh in advance due to the normal distribution phenomenon of the particle size composition of the powder. Some of the powder particles are already fine (meet the requirements of powder particles and do not need to be crushed), how to make the powder particles directly enter the grading chamber for grading is carried out, the grading wheel controls the particle size, and unqualified powder particles fall back to the crushing chamber, so that the effect of jet milling can be improved. Saves energy and becomes the key for solving the problem.

Disclosure of Invention

The invention provides a feeding, washing and crushing structure of a jet mill aiming at the technical problems existing last time.

The purpose of the invention can be realized by the following technical scheme:

a feeding, washing and crushing structure of a jet mill comprises a crushing chamber, a cone fluidized bed, a grading chamber, a discharge pipe and a grading motor from bottom to top in sequence;

wherein: the crushing chamber is sequentially provided with a supersonic speed spray pipe and a guide feeding pipe from bottom to top; the lower part of the conical fluidized bed is provided with two symmetrically arranged by-pass scrubbing airflow channels; the upper part of the grading chamber is provided with a grading wheel.

The technical scheme of the invention is as follows: the end of the guide feeding pipe inserted into the crushing chamber faces upwards.

The technical scheme of the invention is as follows: the bypass scrubbing gas flow channel is arranged below the cone fluidized bed and tangentially enters the fluidization area along the circumference of the shell of the cone fluidized bed.

In some specific embodiments: the guide feeding pipe above the supersonic speed spray pipe turns upwards at an angle of 35 degrees after entering the crushing chamber.

In some specific embodiments: the bypass scrubbing gas flow channel is arranged in the lower quarter of the conical fluidized bed.

The technical scheme of the invention is as follows: the bypass washing airflow channel is provided with an air valve control device.

The invention has the beneficial effects that:

1. the mixture to be crushed enters the crushing chamber and is guided by the feed pipe to enter the fluidizing zone first. The useless work on partial materials (qualified materials) is reduced. Meanwhile, the impact of the materials on the surface wall of the crushing chamber of the feeding pipe due to the inertia of the negative pressure suction of the crushing chamber when the materials enter the crushing chamber is avoided.

2. The materials enter the fluidization area to be washed under the action of the by-pass washing air flow, so that the materials are effectively dispersed and depolymerized. The grading wheel is favorable for grading materials.

3. The grading wheel grades the materials to reach qualified material particles, the qualified powder particles enter the collector through the grading wheel, and unqualified products are blocked by the grading machine to fall to the crushing chamber for crushing.

4. By adopting the structure, the mixed material to be crushed is classified firstly, and unqualified material particles return to the crushing chamber for crushing, so that the effective crushing of the material by the airflow is improved, and the capacity of the airflow crusher is improved. The energy consumption of the jet mill is reduced.

Drawings

FIG. 1 is a schematic view of a feed and scrubbing pulverizing structure of a jet mill.

Figure 2 is a schematic view of a scrubbing and comminuting structure.

Wherein: 1 is supersonic speed spray pipe, 2 is crushing chamber, 3 is guide feeding pipe, 4 is by-pass washing airflow pipeline, 5 is conical fluidized bed, 6 is grading chamber, 7 is grading electrode, 8 is discharging pipe, 9 is grading wheel.

Detailed Description

The invention is further illustrated by the following examples, without limiting the scope of the invention:

referring to fig. 1-2, a feeding and scrubbing-and-crushing structure of a jet mill comprises a crushing chamber 2, a conical fluidized bed 5, a grading chamber 6, a discharge pipe 8 and a grading motor 7 from bottom to top;

wherein: the crushing chamber 2 is sequentially provided with a supersonic speed spray pipe 1 and a guide feeding pipe 3 from bottom to top; the lower part of the conical fluidized bed 5 is provided with two symmetrically arranged bypass scrubbing airflow channels 4; the upper part of the grading chamber 6 is provided with a grading wheel 9.

The end of the guide feeding pipe 3 inserted into the crushing chamber 2 faces upwards. The bypass scrubbing gas flow channel 4 is arranged in a quarter of the position below the cone fluidized bed 5. And enters the fluidization region tangentially along the circumference of the shell of the conical fluidized bed 5.

The pilot feed tube 3, located above the supersonic nozzle 1, turned upwards at an angle of 35 ° after entering the milling chamber. The bypass washing airflow channel 4 is provided with an air valve control device.

The pulverizer has a feeding and scrubbing structure. The material to be crushed enters a crushing chamber, firstly enters a fluidization area under the guide of a feeding pipe, is subjected to washing, dispersion and depolymerization under the action of a bypass washing airflow and then enters a grading area, the grading wheel grades the material to obtain qualified material particles, the qualified powder particles enter a collector through a grading wheel, and unqualified products are blocked by a grading machine and fall back to the crushing chamber for crushing.

Such structure treats kibbling mixed material, grades earlier, and unqualified material granule gets back to and smashes the room and smashes again to improved the effective crushing of air current to the material, also prevented simultaneously that the material from when getting into crushing room, because crushing room negative pressure suction's inertia, the material directly assaults the crushing room wall opposite the inlet pipe, the in-date operation leads to crushing room to be worn to damage.

Claims

1. A feeding and washing and crushing structure of a jet mill is characterized in that: the structure sequentially comprises a crushing chamber (2), a conical fluidized bed (5), a grading chamber (6), a discharge pipe (8) and a grading motor (7) from bottom to top;

wherein: the crushing chamber (2) is sequentially provided with a supersonic speed spray pipe (1) and a guide feeding pipe (3) from bottom to top; the lower part of the cone fluidized bed (5) is provided with two symmetrically arranged bypass scrubbing airflow channels (4); the upper part of the grading chamber (6) is provided with a grading wheel (9).

2. A feeding and scrubbing pulverizing structure of a jet mill as claimed in claim 1, wherein: the guiding feed pipe (3) is inserted into the crushing chamber (2) with one end upward.

3. A feeding and scrubbing pulverizing structure of a jet mill as claimed in claim 1, wherein: the bypass scrubbing gas flow channel (4) is arranged below the cone fluidized bed (5) and tangentially enters the fluidization area along the circumference of the shell of the cone fluidized bed (5).

4. A feeding and scrubbing pulverizing structure of a jet mill as claimed in claim 2, wherein: the guide feeding pipe (3) positioned above the supersonic speed spray pipe (1) turns upwards by an angle of 35 degrees after entering the crushing chamber.

5. A feeding and scrubbing pulverizing structure of a jet mill as set forth in claim 3, wherein: the bypass scrubbing gas flow channel (4) is arranged at a quarter of the position below the conical fluidized bed (5).

6. A feeding and scrubbing pulverizing structure of a jet mill as claimed in claim 1, wherein: the bypass washing airflow channel (4) is provided with an air valve control device.