CN214867266U

CN214867266U - Plasma powder making device with grading device

Info

Publication number: CN214867266U
Application number: CN202120249219.0U
Authority: CN
Inventors: 胡雷
Original assignee: Suzhou Hanxiao Plasma Technology Co ltd
Current assignee: Suzhou Hanxiao Plasma Technology Co ltd
Priority date: 2020-12-15
Filing date: 2021-01-29
Publication date: 2021-11-26
Anticipated expiration: 2031-01-29

Abstract

The utility model belongs to the technical field of material preparation, in particular to a plasma powder processing device with a grading device and a powder processing technology thereof, wherein the powder processing device comprises a plasma torch, a reactor, a grading period and a cyclone bag-type dust collector; the upper part of the plasma torch is connected with a powder feeder, and the side surface of the plasma torch is connected with a high-frequency induction power supply; the upper end of the reactor is connected with the plasma torch, and the lower end of the reactor is connected with the first ejector; the bottom side pipeline of the classifier is connected with a first ejector, the bottom of the classifier is connected with a coarse powder collecting tank, the top side of the classifier is connected with a second ejector, and the classifier is also provided with a dispersion air pipe; the cyclone cloth bag dust collector is connected with the second ejector. The device utilizes the plasma spheroidization technology and the technology that the high centrifugal force that high-speed pivoted impeller produced separates superfine powder, has simple structure, and convenient to use collects plasma spheroidization and powder separation in an organic whole, beneficial effect such as powder process is efficient, effectual.

Description

Plasma powder making device with grading device

Technical Field

The invention relates to the technical field of material preparation, in particular to a plasma powder making device with a grading device.

Background

The plasma spheroidizing method is characterized in that a Radio Frequency (RF) plasma technology is taken as a core technology, various gases are subjected to ohmic heating through the induction action of a radio frequency electromagnetic field to generate plasma, and the principle of spheroidizing powder is that irregular powder passing through a plasma torch is rapidly melted at high temperature (10000K) so that spherical particles are formed by surface tension in the descending process.

The superfine powder produced by a mechanical method is difficult to meet the requirement of the required granularity by mechanically crushing the material once, and the product is often in a larger granularity distribution range. In the use of modern industrial fields, the ultrafine powder product is required to be in a certain particle size distribution range. In addition, in the process of crushing, only a part of products in the powder often meet the requirement of granularity, and the other part of products do not meet the requirement of granularity, if the products meeting the requirement are not separated in time and crushed together with the products which do not meet the requirement, the problems of energy waste and over-crushing of part of products are caused. Therefore, the product is classified in the production process of the ultrafine powder. On one hand, the granularity of the product is controlled to be in a required distribution range, and on the other hand, the product with the granularity meeting the requirement in the mixed powder is separated out in time.

In the existing powder classification process, powder taken out of a powder tank enters a classification device again, and often contacts other substances, so that powder pollution is caused, and finally, the product is difficult to meet the requirements.

Disclosure of Invention

The invention aims to solve the technical problems and provides a plasma milling device with a grading device, which has the advantages of simple structure, convenience in use, integration of plasma spheroidization and powder separation, high milling efficiency and good effect.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a plasma pulverizing apparatus with a classifying device comprises

The plasma torch is connected with the powder feeder above the plasma torch, the side surface of the plasma torch is connected with a high-frequency induction power supply, and argon is introduced into the plasma torch and then ionized by the high-frequency induction power supply to generate plasma flame;

the upper end of the reactor is connected with an outlet at the bottom of the plasma torch, and the lower end of the reactor is connected with a first ejector; the first ejector may evacuate the entire device;

the bottom side of the classifier is connected with a first ejector through a pipeline, the bottom of the classifier is connected with a coarse powder collecting tank, and the top side of the classifier is connected with a second ejector; a dispersing air pipe is also arranged on the classifier below the joint of the classifier and the first ejector pipeline, and dispersing air is introduced into the classifier from bottom to top through the dispersing air pipe;

and the cyclone bag dust collector is connected with the second ejector.

Concretely speaking, still include the argon gas bottle, the argon gas bottle links to each other with first sprayer.

Preferably, the dispersion gas pipe is connected with an argon bottle through a valve.

Preferably, the classifier is connected with the first ejector through a feed pipe, and a second pneumatic regulating valve is arranged on the feed pipe.

As a preferred scheme, a fine powder collecting tank is arranged at the bottom of the cyclone bag-type dust collector.

As a preferred scheme, the top of the side surface of the cyclone bag-type dust collector is provided with a vent pipe; the bottom of the reactor is communicated with a vent pipe through a return pipe, and a first pneumatic regulating valve is arranged on the return pipe.

As a preferable scheme, the powder feeder is also connected with a vent pipe.

Compared with the prior art, the invention has the following beneficial effects:

1. the process adopts the ejector powder feeding and vacuumizing system, the system is stable in operation, a part of recovered inert gas such as argon is upwards introduced into a plurality of nozzles at the bottom of the powder feeder, so that the consumption of the inert gas is reduced, particles in the powder feeder can be lifted, the occurrence of particle agglomeration and bridging is prevented, and meanwhile, the stable powder feeding of the ejector is guaranteed.

2. According to the invention, an inert gas such as argon is independently introduced upwards into the annular pipeline at the lower part of the classifier to serve as a dispersing gas, so that an air screen is formed, particles can be primarily selected, the load of an impeller rotor is reduced, fine particles are reduced and carried into a coarse powder pipe by large particles, and meanwhile, the processing capacity is improved.

3. The whole device is in a vacuum environment, all gases are inert gases such as argon and the like, powder particles do not have explosion and combustion risks in the powder particles, meanwhile, as the suction and powder feeding of the ejector do not have rotating parts, the whole system does not have the conditions of blockage and abrasion, and the device is safe and stable in operation.

4. The impeller rotor of the classifier of the invention has adjustable speed, and can regulate the speed according to the required classification size, and the higher the rotating speed is, the smaller the minimum classification particle size is.

5. The cyclone bag-type dust collector is adopted, and the cyclone dust collector and the bag are combined, so that the volume of equipment is reduced, ultrafine particles can be effectively filtered, and the environmental pollution is prevented.

Drawings

FIG. 1 is a schematic view of the structure of the apparatus of the present invention.

Wherein, the names corresponding to the reference numbers are:

1. the device comprises a powder feeder, 2 parts of a plasma torch, 3 parts of a rotating bracket, 4 parts of an argon bottle, 5 parts of a first ejector, 6 parts of a reactor, 7 parts of a first pneumatic adjusting valve, 8 parts of a return pipe, 9 parts of a classifier, 10 parts of a second ejector, 11 parts of a cyclone bag-type dust collector, 12 parts of a vent pipe, 13 parts of a fine powder collecting tank, 14 parts of a coarse powder collecting tank, 15 parts of a dispersing gas pipe, 16 parts of a feeding pipe, 17 parts of a second pneumatic adjusting valve, 18 parts of a steel structure frame and 19 parts of a high-frequency induction power supply.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.

The present embodiment is intended to provide a plasma spheroidizing technique and a technique for separating ultrafine powder by using an extremely high centrifugal force generated by an impeller rotating at a high speed, and more specifically, a process for pulverizing by using a plasma pulverizing apparatus with a classifying apparatus as shown in fig. 1. The method melts irregular raw material powder into liquid drops through a high-temperature heat source generated by a radio frequency induction power supply, forms spherical powder with a regular shape in the falling process, and directly enters a grading device to screen qualified spherical powder with narrow granularity.

In detail, the plasma powder manufacturing apparatus with a classifying device of the present embodiment mainly includes a powder feeder 1, a plasma torch 2, a reactor 6, an argon gas bottle 4, a classifier 9, a cyclone bag-type dust collector 11, and the like. The reactor 6 is a T-HS-301 reactor, the classifier is a P-XF-03 classifier, the cyclone bag-type dust collector is a T-XE-04 dust collector, the high-frequency induction power supply 19 can generate radio frequency current of 2.6MHz-10MHz, and the ejector is an EJ-QY-05 ejector.

The powder feeder 1 is used for feeding original powder, is integrally funnel-shaped, and is also provided with a funnel-shaped feeding end with a small caliber at the lower part. The powder feeder 1 is connected to the upper part of the plasma torch, the high-frequency induction power supply 19 is connected to the side surface of the plasma torch, and the reactor 6 is connected to the lower end of the plasma torch. The reactor is rotatably connected to the portal frame so as to rotate 360 degrees freely and is turned upside down, thereby facilitating powder feeding and discharging. The lower end of the reactor 6 is connected with the upper port of the first ejector 5, the left port of the first ejector 5 is connected with an argon bottle, the right port of the first ejector 5 is connected with a feeding pipe 16, and a second starting regulating valve 17 is arranged on the feeding pipe. The other end of the feed pipe 16 is connected with the bottom side of the classifier 9. The bottom of the classifier 9 is connected with a coarse powder collecting tank 14, and the top side of the classifier is connected with a second ejector 10; a dispersing gas pipe 15 is also arranged on the classifier 9 below the joint of the classifier 9 and the feeding pipe 16, the dispersing pipe is also connected with the argon bottle 4, and a valve is arranged on the dispersing pipe. The cyclone bag type dust collector 11 is connected with the second ejector 10, the bottom of the cyclone bag type dust collector 11 is provided with a fine powder collecting tank 13, and the top of the side surface of the cyclone bag type dust collector 11 is provided with an emptying pipe 12; one end of the discharge hole of the reactor 6 is communicated with a vent pipe 12 through a return pipe 8, and a first pneumatic regulating valve 7 is arranged on the return pipe. The powder feeder 1 is also connected to a blow pipe 12.

The embodiment also provides a powder making process of the plasma powder making device with the grading device, the process melts irregular raw material powder into liquid drops through a high-temperature heat source generated by a radio frequency induction power supply, spherical powder with a regular shape is formed in the falling process, and the spherical powder directly enters the grading device to be screened out to obtain qualified narrow-granularity spherical powder, so that the technical problems of powder spheroidization and grading are solved, and the problem of secondary pollution caused by separated powder spheroidization and grading is solved. Specifically, the powder preparation process comprises the following steps:

the method comprises the following steps: evacuating the device by means of the first ejector 5, so as to bring the plasma torch 2 to 10Kpa absolute pressure;

step two: introducing argon gas into the plasma torch 2 through the first ejector 5, starting a high-frequency induction power supply to ionize the argon gas, and ionizing the argon gas through radio frequency (2.6MHz-10MHz) current generated by the high-frequency induction power supply to generate plasma flame in the plasma torch 2;

step three: original metal powder or ceramic powder is fed into a plasma torch (2) from a powder feeder (1) from a storage bin, is rapidly melted into a liquid drop state through high temperature (10000K), and is freely dropped and rapidly cooled in a reactor (6), and the liquid drop forms spherical powder in the dropping process due to the action of surface tension;

step four: the sphere powder is rapidly sucked by the first ejector 5 and sent to the classifier 9, the classifier is started, the dispersing gas is introduced through the dispersing gas pipe 15, the powder is dispersed at a plurality of angles in the classifier to form ascending gas flow, in the ascending process, the sphere powder is subjected to the wind screening effect of secondary air of the dispersing gas pipe 15, fine powder mixed in coarse powder is separated, the fine powder continuously ascends along with the gas flow, and in the distribution cone of the classifier 9, the ascending powder is dispersed and uniformly distributed to move around due to the high-speed rotation of the distribution cone. When the powder reaches the classifying area of the impeller, a strong centrifugal force field is generated due to the high-speed rotation of the impeller, and the powder is under the action of the centripetal force generated by the upward airflow and the suction of the second ejector 10 at the rear part of the classifier and the centrifugal force generated by the rotation of the impeller. At this time, the coarse particles are thrown to the cylinder wall and move downward along the cylinder wall due to the centrifugal force greater than the centripetal force, and are discharged to the fine powder collection tank 13 through the coarse particle outlet. And the fine particles are discharged into the cyclone bag-type dust collector 11 along with the air flow from the impeller gap through a fine particle outlet because the centripetal force applied to the fine particles is larger than the centrifugal force, the fine particles enter the coarse powder collecting tank 14, and the other fine particles are discharged from the emptying pipe 12.

Wherein, in order to prevent the powder agglomeration and block the passageway in reactor 6, introduce a share of argon gas through first governing valve 7, get into from the bottom of reactor 6, blow up the powder granule, guarantee that powder and air current enter into first sprayer 5 smoothly, the spheroid powder is under the carrying of air current, gets into grader 9 from the bottom up through inlet pipe 16.

The process combines the plasma radio frequency technology and the high-purity ultrafine powder particle classification technology together, so that the process of qualified spheroidized powder from wide-granularity raw material powder to narrow-granularity raw material powder is shorter, the efficiency is higher, and no pollution risk exists.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.

Claims

1. A plasma powder manufacturing device with a grading device is characterized by comprising

The plasma torch (2), the powder feeder (1) is connected above the plasma torch, the side surface of the plasma torch is connected with a high-frequency induction power supply (19), and argon is introduced into the plasma torch and then ionized by the high-frequency induction power supply to generate plasma flame;

the upper end of the reactor (6) is connected with an outlet at the bottom of the plasma torch (2), and the lower end of the reactor is connected with a first ejector (5); the first ejector may evacuate the entire device;

the bottom side of the classifier is connected with a first ejector (5) through a pipeline, the bottom of the classifier is connected with a coarse powder collecting tank (14), and the top side of the classifier is connected with a second ejector (10); a dispersing air pipe (15) is also arranged on the classifier (9) below the pipeline joint of the classifier (9) and the first ejector (5), and dispersing air is introduced into the classifier from bottom to top through the dispersing air pipe (15);

and the cyclone bag dust collector (11) is connected with the second ejector (10).

2. A plasma milling apparatus as claimed in claim 1, further comprising an argon tank (4) connected to the first injector (5).

3. A powder manufacturing apparatus as claimed in claim 2, wherein said gas dispersing pipe (15) is connected to the argon gas cylinder (4) through a valve.

4. A powder manufacturing apparatus as claimed in any one of claims 1 to 3, wherein the classifier (9) is connected to the first injector (5) via a feeding pipe (16) provided with a second pneumatic control valve (17).

5. A plasma pulverizing device with a grading plant as in claim 4 characterized by that, the bottom of the cyclone bag-type dust collector (11) is equipped with a fine powder collecting tank (13).

6. A plasma pulverizing device with a grading plant as in claim 5, characterized by that, the top of the side of the cyclone bag-type dust collector (11) is equipped with a blow-down pipe (12); the bottom of the reactor (6) is communicated with a vent pipe (12) through a return pipe (8), and a first pneumatic regulating valve (7) is arranged on the return pipe.

7. A powder manufacturing apparatus as claimed in claim 6, wherein said powder feeder (1) is further connected to a blow-down pipe (12).