CN115780240A - Screening system for titanium powder granularity classification and working method thereof - Google Patents

Abstract

The invention discloses a screening system for titanium powder granularity classification and a working method thereof, and the screening system comprises a screening module, an air supply module and a vacuum module, wherein the screening module comprises a vacuum rotary vibration screen, the vacuum rotary vibration screen is provided with a feed inlet, an air suction opening, an air inlet, a pressure detection opening and a discharge opening, the feed inlet is connected with a material source through a feed pipe, the air suction opening is connected with the vacuum module through an air suction pipeline, the air inlet is connected with the air supply module through an air inlet pipeline, the pressure detection opening is connected with a pressure detection instrument through a pipeline, the discharge opening is connected with a material receiving device through a discharge pipeline, and valves are arranged on the feed pipe, the air suction pipeline, the air inlet pipeline and the discharge pipeline. The working method comprises the steps of target vacuum extraction, inert atmosphere formation, granularity grading screening and screening continuous operation. The invention has the advantages of small civil engineering quantity, quick vacuumizing, simple flow, quick starting, sustainable work, safety, reliability and lower construction cost.

Description

Screening system for titanium powder granularity classification and working method thereof

Technical Field

The invention belongs to the technical field of metal powder preparation, and particularly relates to a screening system for titanium powder granularity classification and a working method thereof.

Background

With the development of industries such as additive manufacturing and powder metallurgy, the quality and quantity requirements of titanium and titanium alloy powder are increasingly improved, and the titanium powder has large surface free energy, so the titanium powder is very active and is very easy to oxidize, the powder quality is influenced, air isolation is needed during screening, and inert atmosphere is often needed in the screening process. At present, most of the whole equipment for screening in the market is imported equipment, a vacuum bin is used for wrapping a totally-enclosed screening device of a whole screen body, and the purpose of target vacuum is achieved through totally-enclosed wrapping of the vacuum bin.

Therefore, a screening system for titanium powder granularity classification, which has the advantages of simple flow, convenient control, quick vacuum pumping, small civil engineering quantity, safety and effectiveness, needs to be developed.

Disclosure of Invention

The invention aims to provide a titanium powder granularity grading screening system which has simple and controllable flow, can be quickly started and continuously operated, is safe and reliable and is convenient to construct and a working method thereof for a titanium and titanium alloy milling and extending process.

The invention aims to realize the purpose, which comprises a screening module, an air supply module and a vacuum module, wherein the screening module comprises a vacuum rotary vibration screen, the vacuum rotary vibration screen is provided with a feed inlet, an air suction port, an air inlet, a pressure detection port and a discharge port, the feed inlet is connected with a material source through a feed pipe, the air suction port is connected with the vacuum module through an air suction pipeline, the air inlet is connected with the air supply module through an air inlet pipeline, the pressure detection port is connected with a pressure detection instrument through a pipeline, the discharge port is connected with a material receiving device through a discharge pipeline, and valves are arranged on the feed pipe, the air suction pipeline, the air inlet pipeline and the discharge pipeline.

The working method of the screening system for titanium powder granularity classification comprises the following steps:

1) Target vacuum pumping, namely connecting a titanium powder feeding tank and a titanium powder storage tank, opening valves on an air exhaust pipeline and a discharge pipeline, and starting an air exhaust pump set to pump the screening system to a target vacuum through a vacuum module;

2) Forming an inert atmosphere, closing a valve on the air exhaust pipeline, and opening an air supply valve on the air inlet pipeline until the partial pressure of the inert gas meets the system requirement;

3) Screening in a particle size grading manner, starting a vacuum rotary vibration screen in an inert atmosphere, starting a material flow valve on a feeding pipe, starting particle size grading, and feeding titanium powder with different particle sizes into respective titanium powder storage tanks through respective discharge holes;

4) And (4) continuously performing screening, namely closing a valve at the joint of the feeding pipe and the charging bucket after one tank is screened, closing a discharging pipeline, avoiding destroying the inert atmosphere of the system, installing a next titanium powder feeding tank to be screened, and then opening the valve to realize continuous screening.

The invention has the following technical effects:

1. the invention improves the rotary vibrating screen in vacuum, cancels a vacuum bin in import equipment, thereby reducing the precision requirement and the assembly precision of equipment processing and manufacturing, reducing the occupied area and the construction amount of the equipment, shortening the period of manufacturing and construction, shortening the vacuumizing time by reducing the volume of realizing a vacuum environment, improving the working efficiency, reducing the volume, reducing the loss of inert atmosphere and saving the consumption of inert gas;

2. the invention has simple structure and simple installation process, can be conveniently arranged according to the field, the main modules are connected by the pipelines and the flexible connecting pieces, the material flow and the air flow pipeline can also be connected into a stock bin, a factory building pipeline and the like, and the invention has strong compatibility with the factory environment, reduces the factory building transformation cost and is convenient for construction, use and popularization.

Drawings

FIG. 1 is a schematic diagram of a screening system according to the present invention;

FIG. 2 is a schematic diagram of the arrangement and connection of the core modules (sieving module, air supply module, vacuum module) of the present invention;

figure 3 is a schematic view of the screening module equipment arrangement and connections of the present invention;

FIG. 4 is a schematic view of the vacuum rotary vibrating screen of the present invention showing the shape and the interface;

FIG. 5 is a schematic view of the arrangement and connection of the air supply module apparatus of the present invention;

FIG. 6 is an enlarged view of a portion of FIG. 5;

FIG. 7 is a rear upper right isometric view of FIG. 5;

FIG. 8 is a schematic view of the vacuum module apparatus arrangement and connections of the present invention;

in the figure: 1-screening module, 2-gas supply module and 3-vacuum module; 4-base steel structure platform, 1A-vacuum rotary vibrating screen, 1B-titanium powder feeding tank, 1C-titanium powder storage tank, 1D-valve, 1E-feeding pipe, 1F-pneumatic butterfly valve, 1G-discharging pipe, 1H-feeding pipe, 2A-gas cylinder, 2B-gas collector, 2C-gas distribution bag, 2D-gas inlet hose, 2E-gas path valve, 2F-purging hose, 2G-pressure reducing valve, 2H-hose, 2I-gas inlet pipe, 2K-pneumatic vacuum valve, 3A-pump set, 3B-basket filter, 3C-vacuum hose, 3D-vacuum pumping pipeline, K1-feeding port, K2-pumping port, K3-gas inlet port, K4-pressure detection port and K5-discharging port.

Detailed Description

The present invention is further described with reference to the drawings, but the present invention is not limited thereto in any way, and any modifications or alterations based on the teaching of the present invention shall fall within the scope of the present invention.

The invention as shown in the attached figures 1-8 comprises a screening module 1, an air supply module 2 and a vacuum module 3, wherein the screening module 1 comprises a vacuum rotary vibration screen 1A, a feed inlet K1, an air suction opening K2, an air inlet K3, a pressure detection opening K4 and a discharge opening are arranged on the vacuum rotary vibration screen 1A, the feed inlet K1 is connected with an upper material source through a feed pipe 1E, the air suction opening K2 is connected with the vacuum module 3 through an air suction pipeline, the air inlet K3 is connected with the air supply module 2 through an air inlet pipeline, the pressure detection opening K4 is connected with a pressure detection instrument through a pipeline, the discharge opening is connected with a lower material receiving device through a discharge pipeline, and valves are arranged on the feed pipe, the air suction pipeline, the air inlet pipeline and the discharge pipeline.

The gas supply module 2 comprises an inert gas cylinder 2A and a gas collector 2B, the gas cylinder 2A is connected with a gas inlet of the gas collector 2B through a pressure reducing valve 2G and a hose 2H, and a gas outlet of the gas collector 2B is connected with a gas inlet K3 of the vacuum rotary vibrating screen 1A through a gas inlet pipe 2I, a gas circuit valve 2E and a gas inlet hose 2D. The gas collector 2B can also be connected with a factory gas source or a plurality of gas cylinders to avoid the influence on the quality of a final product caused by the replacement of the gas source in work.

The air inlet pipe 2I is provided with a branch pipe, the branch pipe is connected with an air distribution bag 2C, and the air distribution bag 2C is connected with a material guide pipe 1H through a purging hose 2F. In order to avoid material pipe blockage, an inert gas supply system is divided into two paths, one path is connected with a rotary vibrating screen air inlet, and the other path is connected with a material guide pipe through a gas distribution bag to perform intermittent auxiliary blowing and blanking.

And a pneumatic vacuum valve 2K is arranged on the branch pipe. The inert atmosphere pressure in the system can reduce gradually in the actual use process, and the inert gas flow sweeps the bent part of the material guide pipe for a short time by controlling the opening and closing of the pneumatic vacuum valve, so that the material is prevented from blocking the pipe, and the air pressure loss in the system is supplemented.

The vacuum rotary vibration sieve 1A is a multi-stage vacuum rotary vibration sieve.

The vacuum module 3 comprises a gas-pumping pump group 3A, a basket filter 3B and a vacuum-pumping hose 3C, wherein the gas-pumping pump group 3A is connected to a gas-pumping hole K2 of the vacuum rotary vibration sieve 1A through a vacuum-pumping pipeline 3D, the basket filter 3B and the vacuum-pumping hose 3C, and a vacuum safety valve is arranged at the joint of the gas-pumping hole K2.

The material source is titanium powder feed tank 1B, titanium powder feed tank 1B passes through inlet pipe 1E and is connected with feed inlet K1, set up valve 1D on the inlet pipe, the valve is used for controlling material flow. The feeding tank 1B and the vacuum rotary vibration sieve 1A are arranged in a centering way, so that the material flow is convenient to circulate quickly.

The receiving device is a titanium powder storage tank 1C, and the titanium powder storage tank is connected with a discharge port of the vacuum rotary vibrating screen 1A through a material guide pipe 1H, a material discharge pipe 1G and a pneumatic butterfly valve 1F. Storage tank 1C places in the one deck, presses close to the equipment central line as far as possible under the prerequisite that does not influence the handling and places, avoids the material to flow and blocks up.

And the titanium powder storage tank 1C is provided with a pressure relief air valve. When the pressure is too high, the pressure relief air valve is opened to relieve the pressure, so that the safety is guaranteed; the device can also be started when the material pipe is blocked, and the gas of the inert gas source performs high-strength purging on the system pipeline to blow away the blocking material.

Still include basic steel structure platform 4, basic steel structure platform 4 includes steel frame construction, operation platform passes through high strength bolt and is connected with steel frame construction, material source, vacuum are shaken soon and are sieved, receiving device from top to bottom divide the three-layer setting on the basic steel structure platform. The foundation steel structure platform can be used as a main structure to support other modules to work, and can be independently built or built by means of surrounding buildings.

The working method of the screening system for titanium powder size classification according to any one of claims 1 to 8, comprising the following steps:

1) Target vacuum pumping, namely connecting a titanium powder feeding tank and a titanium powder storage tank, opening valves on an air exhaust pipeline and a discharge pipeline, and starting an air exhaust pump group 3A to pump a screening system to a target vacuum through a vacuum module;

2) Forming an inert atmosphere, closing a valve on the air exhaust pipeline, and opening an air supply valve on the air inlet pipeline until the partial pressure of the inert gas meets the system requirement;

3) Screening in a particle size grading manner, starting a vacuum rotary vibration screen 1A under inert atmosphere, starting a material flow valve 1D on a feeding pipe, starting particle size grading, and feeding titanium powder with different particle sizes into respective titanium powder storage tanks through respective discharge ports;

4) And (4) continuously performing screening, namely closing a valve 1D at the joint of the feeding pipe and the charging bucket after finishing the screening of one tank, closing a discharging pipeline, installing a next titanium powder feeding tank to be screened, and then opening the valve 1D to realize the continuous screening operation. The blanking pipe is closed to avoid destroying the inert atmosphere of the system.

The working principle and the working process of the invention are as follows: in an inert atmosphere, the material flow is used as the fluid characteristic and gravity of the metal powder to finish the action of entering the rotary vibration sieve from the feeding tank, and the material smoothly enters the storage tank by virtue of self potential energy and discontinuous gas flow purging after the sieving with different granularity grades is finished in the sieve body.

Titanium powder has more active chemical characteristics, and the whole screening process must be carried out in inert atmosphere, so accomplish the replacement of the interior atmosphere of system through air feed module and vacuum module before the material stream gets into the vacuum rotary vibration sieve, after charge-in pipeline, unloading pipeline and material jar are connected and are accomplished, start vacuum module earlier and take out the system to target vacuum, then open inert gas's air supply valve, open the material stream valve after the atmospheric pressure of inert gas reaches system screening requirement in the system, carry out the hierarchical screening of granularity. In order to realize continuous work, a valve is additionally arranged at the joint of the feeding pipe and the feeding tank to control the starting and stopping of the feeding, and the feeding pipeline is closed when the feeding tank is replaced, so that the inert atmosphere in the system is prevented from being damaged. Simultaneously, for entire system can install fast and convenient the maintenance, the basic steel structure platform comprises basic steel structure and work platform two parts, and work platform and basic steel structure are connected with high strength bolt, do benefit to hoist in proper order when first installation and dismantle fast when equipment maintenance changes.

When the system works, the system is assembled and debugged, the titanium powder feeding tank 1B and the titanium powder storage tank 1C are connected, valves on an air exhaust pipeline and a discharge pipeline are opened, and an air exhaust pump group 3A is started to pump the screening system to a target vacuum through a vacuum module; then the valve on the air exhaust pipeline is closed, and the air supply valve 2E on the air inlet pipeline is opened to supply inert gas into the system until the air pressure of the inert gas meets the system requirement; starting the vacuum rotary vibration sieve 1A under inert atmosphere, opening a material flow valve 1D on a feeding pipe, and performing particle size grading sieving, wherein titanium powder with various particle sizes respectively enters into respective titanium powder storage tanks through respective discharge ports; when the air pressure in the system is reduced to a certain degree and does not meet the screening air pressure requirement, a pneumatic vacuum valve 2K is opened, high-pressure air at an air source end passes through a purging hose 2F after a gas distribution bag through a valve to purge a material guide pipe 1H, pipe blockage is avoided, air pressure loss is supplemented to enable the air pressure in the system to meet the requirement, and then the pneumatic vacuum valve 2K is closed to perform purging intermittently; after the screening of a jar is accomplished, close the valve 1D of inlet pipe and the junction of material jar, close the unloading pipeline, install the titanium powder feed tank that waits to screen next again, then open valve 1D, realize the operation of continuation screening.

Claims (9)

1. The utility model provides a screening system for titanium powder particle size classification, includes screening module (1), air feed module (2), vacuum module (3), its characterized in that: screening module (1) is including the vacuum sieve (1A) that shakes soon, the vacuum is shaken soon and is provided with feed inlet (K1), extraction opening (K2), air inlet (K3), pressure detection mouth (K4), discharge gate on sieve (1A), feed inlet (K1) is connected with top material source through inlet pipe (1E), extraction opening (K2) is connected with vacuum module (3) through the admission line, air inlet (K3) are connected with air feed module (2) through the admission line, pressure detection mouth (K4) are connected with pressure detection instrument through the pipeline, the discharge gate passes through the discharge pipeline and is connected with the below device, all set up the valve on inlet pipe, admission line, the discharge pipeline.

2. The screening system for titanium powder size classification as claimed in claim 1, wherein: the gas supply module (2) comprises an inert gas cylinder (2A) and a gas collector (2B), the gas cylinder (2A) is connected with a gas inlet of the gas collector (2B) through a pressure reducing valve (2G) and a hose (2H), and a gas outlet of the gas collector (2B) is connected to a gas inlet (K3) of the vacuum rotary vibrating screen (1A) through a gas inlet pipe (2I), a gas circuit valve (2E) and a gas inlet hose (2D).

3. The screening system for titanium powder size classification as claimed in claim 2, wherein: the air inlet pipe (2I) is provided with a branch pipe, the branch pipe is connected with a gas distribution bag (2C), the gas distribution bag (2C) is connected with a material guide pipe (1H) through a blowing hose (2F), and the branch pipe is provided with a pneumatic vacuum valve (2K).

4. The screening system for titanium powder size classification as claimed in claim 1, wherein: the vacuum rotary vibration sieve (1A) is a multi-stage vacuum rotary vibration sieve.

5. The screening system for titanium powder size classification as claimed in claim 1, wherein: the vacuum module (3) comprises a gas-pumping pump set (3A), a basket filter (3B) and a vacuumizing hose (3C), wherein the gas-pumping pump set (3A) is connected to a gas-pumping hole (K2) of the vacuum rotary vibration sieve (1A) through a vacuumizing pipeline (3D), the basket filter (3B) and the vacuumizing hose (3C), and a vacuum safety valve is arranged at the joint of the gas-pumping hole (K2).

6. The screening system for titanium powder size classification as claimed in claim 1, wherein: the material source is titanium powder feed tank (1B), titanium powder feed tank (1B) is connected with feed inlet (K1) through inlet pipe (1E), set up valve (1D) on the inlet pipe, the valve is used for controlling the material stream flow.

7. The screening system for titanium powder size classification as claimed in claim 1, wherein: the material receiving device is a titanium powder storage tank (1C), and the titanium powder storage tank is connected with a discharge port of the vacuum rotary vibration sieve (1A) through a material guide pipe (1H), a material discharge pipe (1G) and a pneumatic butterfly valve (1F).

8. A screening system for titanium powder size classification as claimed in claim 1, wherein: still include basic steel structure platform (4), basic steel structure platform (4) include steel frame construction (4A), operation platform passes through high strength bolt and is connected with steel frame construction, material source, vacuum are shaken soon sieve, receiving device from top to bottom and are divided the three-layer and set up on the basic steel structure platform.

9. The working method of the screening system for titanium powder size classification according to any one of claims 1 to 8 is characterized in that: the method comprises the following steps:

1) Target vacuum extraction, namely connecting a titanium powder feeding tank and a titanium powder storage tank, opening valves on an air exhaust pipeline and a discharge pipeline, and starting an air exhaust pump set (3A) to vacuumize a screening system to a target vacuum through a vacuum module;

2) Forming an inert atmosphere, closing a valve on the air exhaust pipeline, and opening an air supply valve on the air inlet pipeline until the partial pressure of the inert gas meets the system requirement;

3) Screening in a particle size grading manner, namely starting a vacuum rotary vibration screen (1A) under inert atmosphere, starting a material flow valve (1D) on a feeding pipe, starting particle size grading, and feeding titanium powder of all levels of particle sizes into respective titanium powder storage tanks through respective discharge holes;

4) And (4) continuously performing screening, namely closing a valve (1D) at the joint of the feeding pipe and the charging bucket after finishing the screening of one tank, closing a discharging pipeline, then installing a next titanium powder feeding tank to be screened, and then opening the valve (1D) to realize continuous screening.

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