CN112027380A - Storage system for metal powder and use method thereof - Google Patents
Storage system for metal powder and use method thereof Download PDFInfo
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- CN112027380A CN112027380A CN202010864813.0A CN202010864813A CN112027380A CN 112027380 A CN112027380 A CN 112027380A CN 202010864813 A CN202010864813 A CN 202010864813A CN 112027380 A CN112027380 A CN 112027380A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/54—Large containers characterised by means facilitating filling or emptying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
- B65D88/745—Large containers having means for heating, cooling, aerating or other conditioning of contents blowing or injecting heating, cooling or other conditioning fluid inside the container
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/46—Arrangements for carrying off, or preventing the formation of electrostatic charges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
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Abstract
The invention discloses a storage system of metal powder and a use method thereof, wherein a storage tank in a blanking system is connected with inert gas, a vacuum pump and atmosphere, so that a micro-positive pressure environment can be ensured in the storage tank; the system can be provided with a plurality of storage tanks according to actual requirements, a plurality of types of metal powder can be placed among different storage tanks, and each storage tank is provided with a respective control valve, so that the system can be independently controlled; secondly, adopt this storage tank to preserve metal powder, can realize once adding the metal powder of the same material in a large batch, and anytime and anywhere takes according to the volume, avoided the vacuum fixed package open the back, the contaminated risk of unnecessary unused new metal powder repeated contact air.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of storage, and particularly relates to a storage system for metal powder and a using method thereof.
[ background of the invention ]
Additive Manufacturing (AM) has been successfully applied in the industries of aviation, aerospace, medical treatment, molds, and the like due to its characteristics of being fast, free of molds, free of forming, and capable of Manufacturing complex structures. The metal additive manufacturing has strict requirements on the quality of metal powder, and particularly for titanium alloy powder, aluminum alloy powder and magnesium alloy powder with high activity, the price is high, and the powder cannot be used due to improper storage, oxidation and moisture absorption. In addition, for some light alloy metal powder, such as aluminum alloy and magnesium alloy, the powder is suspended in the air during storage, if the powder is not stored properly, explosion will occur when the powder meets open fire, and therefore, the safety hazard is great. The preparation process of the metal powder relates to multiple links of smelting, rod making, powder making, sieving and the like, the yield of powder with certain granularity is low (for example, ultrafine powder with 325 meshes), the manufacturing period is long, the requirement of continuous additive manufacturing on a large amount of raw materials in unit time is difficult to meet, and the powder needs to be stored for multiple times to meet the requirement; in addition, for the research and development of new materials for additive manufacturing, due to the limitations of practical metallurgy and powder making processes, a lot of metal powder with a certain amount is often required to be manufactured at one time according to designed alloy components, and the metal powder needs to be taken for multiple times in the experimental process. Under both of the above conditions, it is desirable to safely store the additive manufacturing metal powder for a long period of time.
At present, metal powder manufactured by an additive is manufactured by a powder manufacturing factory, and is packaged by a vacuumizing packaging bag and directly sent to a client, and the client opens the vacuum packaging bag for use when needing to use. There are several problems: firstly, vacuum packaging is standard, generally a 5kg bag, if the amount used at one time is small or large, a considerable amount of metal powder is often left, and if the left metal powder is not processed in time, the risk of oxidation or moisture absorption is often existed; secondly, vacuum packaging is often plastic packaging, leakage is easily caused in the processes of transportation, carrying and storage, so that metal powder is contacted with air, the powder is possibly dispersed and distributed in the air under certain external conditions, and huge potential safety hazards exist; thirdly, the ordinary laboratory or workshop has bought the evacuation equipment, can save remaining metal powder by evacuation again, also can save by evacuation to the metal powder who has used the recovery, but all adopt plastic bag package, and the quantity that once can store is limited, and plastic packaging has the problem that takes once just need repackage. Fourthly, some manufacturers pack metal powder by plastic bottles, which is convenient to take and use at any time, but the packing has poor sealing performance and needs to be used up as soon as possible once the packing is opened. If the powder is stored in an open package for too long, there is a risk of oxidation and moisture absorption.
The use characteristics of the metal powder in the additive manufacturing process are that the metal powder is usually purchased in large quantities and continuously delivered when being purchased; when in use, the utility model is often used in a pulse type and sectional type, and a certain amount of the utility model is needed at one time, and the utility model can be taken for a plurality of times; the new powder and the recovered powder need to be clearly distinguished; in the process of taking and storing the powder, the powder is prevented from being blown and suspended in the air; the contact between the metal powder and the air is controlled as much as possible in the long-term storage process. These are the special requirements of additive manufacturing for metal powders.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provides a storage system of metal powder and a using method thereof, which are used for solving the technical problems that alloy powder is difficult to store and difficult to obtain in the using process in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a storage system for metal powder comprises at least one storage tank, wherein each storage tank is provided with a gas inlet and a gas outlet, the gas inlet is connected with a first electromagnetic valve, the gas outlet is connected with a second electromagnetic valve, the first electromagnetic valve is connected to an inert gas cylinder, the second electromagnetic valve is connected to an exhaust pipeline, the terminal of the exhaust pipeline is communicated to atmosphere or a vacuum pump, the atmosphere or the vacuum pump is communicated with the terminal of the exhaust pipeline side by side, a third electromagnetic valve is arranged between the terminal of the exhaust pipeline and the atmosphere, and a fourth electromagnetic valve is arranged between the exhaust pipeline and the vacuum pump; the material storage tank is connected with a barometer; the upper end of the material storage tank is provided with a feeding port, and the lower end of the material storage tank is provided with a discharging port;
the air pressure meter, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are all connected to the logic controller;
when metal materials are filled in the material storage tank, inert gas is filled in the material storage tank, and the pressure of the inert gas is 1-2% higher than the atmospheric pressure; the oxygen content in the storage tank is less than 1000 ppm.
The invention is further improved in that:
preferably, a main electromagnetic valve is arranged between the first electromagnetic valve and the inert gas cylinder, and a pressure reducing valve is arranged between the main electromagnetic valve and the inert gas cylinder; the master solenoid valve is connected to a logic controller.
Preferably, the storage tank is connected with a detection port, and the detection port is connected with an oxygen content detection sensor.
Preferably, the storage tank is connected with a humidity meter.
Preferably, the storage tanks are all arranged on the frame, and the frame is grounded.
Preferably, the feeding port is in threaded connection with a feeding port cover plate.
Preferably, a baffle valve is arranged in the discharge hole.
Preferably, the storage tank is made of stainless steel.
The using method of the storage system for the metal powder comprises the steps of adding the metal powder, washing and blanking;
a process of adding metal powder;
judging the difference between the internal pressure and the external pressure of the material storage tank through a barometer, if the difference is greater than the value A, opening a second electromagnetic valve and a third electromagnetic valve, closing a fourth electromagnetic valve, communicating the material storage tank with the atmosphere until the internal pressure of the material storage tank is the external atmospheric pressure, and opening a feeding port for feeding; if the difference of storage tank internal pressure and outside atmospheric pressure is less than the A value, then directly open the pan feeding mouth reinforced, after reinforced, close the pan feeding mouth, close the third solenoid valve for the storage tank is isolated with the atmosphere.
A process of scrubbing;
closing the first electromagnetic valve, and opening the second electromagnetic valve and the fourth electromagnetic valve to dry the gas in the material storage tank by the vacuum pump; closing the second electromagnetic valve, opening the first electromagnetic valve, filling inert gas into the material storage tank, and closing the first electromagnetic valve when the barometer displays that the pressure in the material storage tank reaches a set value B; repeating the pumping and inflating processes repeatedly until the oxygen content in the storage tank is less than 1000ppm, and finishing the gas washing process;
blanking;
and closing the main electromagnetic valve and the first electromagnetic valve, opening the second electromagnetic valve and the third electromagnetic valve, and opening the discharge hole of the storage tank when the difference value between the internal pressure of the storage tank and the external atmospheric pressure is less than the A value.
Preferably, the value of A is 0.1KPa during the process of adding the metal powder; in the process of gas washing, the set value B is 0.5-5KPa greater than the atmospheric pressure.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a storage system of metal powder, which ensures that a storage tank in a blanking system is in a micro-positive pressure environment by connecting an inert gas, a vacuum pump and the atmosphere with the storage tank, effectively avoids the risk of oxidation and moisture absorption in the process of repeatedly taking the powder and the potential safety hazard caused by powder leakage compared with a vacuumized negative pressure storage method, and is particularly suitable for long-term storage of active metal powder such as easily oxidized titanium alloy, aluminum alloy, magnesium alloy and the like; the system can be provided with a plurality of storage tanks according to actual requirements, a plurality of types of metal powder can be placed among different storage tanks, each storage tank can be simultaneously connected with air, a vacuum pump and inert gas, and each storage tank is provided with a respective control valve, so that the storage tanks can be independently controlled; secondly, adopt this storage tank to preserve metal powder, can realize once adding the metal powder of the same material in a large batch, and anytime and anywhere takes according to the volume, avoided the vacuum fixed package open the back, the contaminated risk of unnecessary unused new metal powder repeated contact air. All the electromagnetic valves are connected to the logic controller, so that the whole blanking process does not need manual operation, the powder is convenient to take and use, and the powder only needs to be put into the storage tank manually at first. The system is not only suitable for storage of additive manufacturing metal powder, but also can be widely applied to industries such as powder metallurgy and the like.
Furthermore, the main electromagnetic valve can control the inert gas supply in the whole material storage and blanking system, and the gas supply pressure can be adjusted through a pressure reducing valve.
Furthermore, the detection port is connected with an oxygen content detection sensor, so that the oxygen content of the tank body can be measured.
Further, the storage tank is connected with a humidity meter, and the humidity of the storage tank is measured and displayed.
Further, the storage tank is arranged on the frame, and the frame is grounded to prevent static electricity.
Further, the feeding port and the feeding port cover plate are connected through threads, so that the material can be easily picked, and the sealing performance is good.
Furthermore, the discharge hole is provided with a baffle valve, so that the blanking is convenient.
Further, the storage frame is stainless steel, easily in time passes through the wire with production static such as powder flow friction in time and in time gets rid of, very big promotion the security when powder is stored. (some light alloy such as aluminum alloy, magnesium alloy and other powder are easy to disperse in the air, and dust explosion and other safety accidents are easy to cause when static electricity occurs).
The invention also discloses a using method of the storage system of the metal powder, the method is characterized in that an inert gas device is added in the whole charging process, and the process adopts a control mode of automatic circular gas washing, so that the rapid automatic gas washing can be realized, and the contact between the metal powder and the air is greatly reduced; finally, the invention has simple structure, clear identification, strong maintainability, low manufacturing cost and low use cost, and can realize the dynamic expansion of a plurality of storage tank groups. (explosion-proof, prevent the dispersion of powder), the problem of environmental protection. The method can be used for additive manufacturing of metal powder, particularly for metal powder of titanium alloy, aluminum alloy, magnesium alloy and the like which are easy to oxidize, long-time storage is realized, the powder can be used at any time easily, and the using quantity is not limited. The powder can be effectively reduced from being blown and dispersed into the air during the powder storage process.
[ description of the drawings ]
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a control logic diagram of the present invention;
wherein, 1 is an inert gas cylinder, 2 is a pressure reducing valve, 3 is a master electromagnetic valve, 4 is a detection port, 5 is a gas pressure meter, 6 is a first electromagnetic valve, 7 is a second electromagnetic valve, 8 is a feeding port, 9 is a gas inlet, 10 is an inert gas pipeline, 11 is a gas outlet, 12 is an exhaust pipeline, 13 is a third electromagnetic valve, 14 is a fourth electromagnetic valve, 15 is a vacuum pump, 16 is a logic controller, 17 is a storage tank, 18 is a discharge port, 19 is a baffle valve, and 20 is a frame; 21-a feed inlet cover plate; 22-a tee joint; 23-humidity table.
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, the present invention discloses a storage system for metal powder and a method for using the same, wherein the storage system comprises the following components and the basic connection relationship: whole frame 20 is the steel structure, installs and prevents static subaerial and ground connection, is provided with a plurality of storage tank 17 on whole frame 20, and each storage tank 17 is all fixed to be set up on frame 20, and storage tank 17 set up quantity and volume and decide according to specific alloy powder demand, can place the same alloy powder in the different storage tanks 17, also can place different alloy powder.
Preferably, the storage tank 17 is divided into an upper part and a lower part which are integrally connected, the upper part is of a cylindrical barrel-shaped structure, the lower part is of a funnel shape, namely the cross-sectional area of the upper end surface of the lower part is larger than that of the lower end surface, so that metal powder can conveniently flow and be discharged in the storage tank 17; a material inlet 8 is formed in the end face of the top of the material storage tank 17, a material outlet 18 is formed in the end face of the bottom of the material storage tank 17, the material inlet 8 is preferably arranged in the center of the top end, and the material outlet 18 is preferably arranged in the center of the bottom end, so that the material can be conveniently loaded and released; the upper part of the side wall of the feeding opening 8 is of an external thread structure, and the feeding opening cover plate 21 (internal thread) and the feeding opening 8 can be conveniently and tightly connected together through the thread structure, so that the feeding opening is sealed and opened; the discharge port 18 is arranged at the bottom end of the lower part of the storage tank 17, a baffle valve 19 is arranged in the discharge port 18, the opening and closing of the baffle valve 19 can realize the outflow of powder from the discharge port, the outflow of powder can be prevented after the baffle valve 19 is closed, and the contact between the powder and air can be prevented under the combined action of the feed port cover plate 21 and the baffle valve 19 to form a closed environment of the storage tank 17; the top end of the material storage tank 17 is provided with two air holes, one is an air inlet 9, and the other is an air outlet 11; wherein the gas inlet 9 is connected with the first electromagnetic valve 6, and the first electromagnetic valve 6 is communicated with the inert gas pipeline 10; the air outlet 11 is communicated with a second electromagnetic valve 7, and the second electromagnetic valve 7 is communicated with an exhaust pipeline 12; the tail end of the exhaust pipeline 12 is connected with a tee joint 22, the other two ends of the tee joint 22 are respectively connected with a third electromagnetic valve 13 and a fourth electromagnetic valve 14, the third electromagnetic valve 13 is communicated with the atmosphere through a pipeline, and the fourth electromagnetic valve 14 is connected with a vacuum pump 15 through a pipeline; the top of the material storage tank 17 is provided with a detection port 4, and the detection port 4 is connected with an oxygen content detection sensor to realize the measurement of the oxygen content of the tank body; the top of the storage tank 17 is provided with a barometer 5 for displaying the pressure inside the storage tank 17; because the requirement of the metal powder on the humidity of the environment is strict, the humidity meter 23 is arranged at the top of the storage tank 17 and used for measuring and displaying the humidity of the storage tank 17; one end of the inert gas pipeline 10 is sealed, the other end of the inert gas pipeline is connected with a main electromagnetic valve 3, the main electromagnetic valve 3 is connected with a pressure reducing valve 2, and the pressure reducing valve 2 is installed on an inert gas cylinder 1. The barometers 5 on all the storage tanks 17 in the system are connected with a logic controller 16(PLC), and the pressure readings of the barometers 5 are read in real time; all the solenoid valves are connected to the output port of the logic controller 16, so that the logic controller 16 can control the on/off of each solenoid valve 16, and the solenoid valves include: a master solenoid valve 3, a first solenoid valve 6, a second solenoid valve 7, a third solenoid valve 13 and a fourth solenoid valve 14. The method is realized by program control: firstly, controlling the balance of internal and external pressure; second, multiple circulation gas washing control; long-term micro-positive pressure continuous control; the micro-positive pressure is 1% -2% greater than the atmospheric pressure.
The using method of the invention is characterized in that the storage system of the invention can basically comprise three steps, namely adding the powder into the storage tank, emptying the air in the storage tank, changing the internal gas into inert gas, and finally maintaining the internal pressure to realize the long-term storage of the powder.
5.1 description of the Process for adding Metal powder
Closing the main electromagnetic valve 3 and the first electromagnetic valve 6, determining the internal pressure of a material storage tank 17 to be discharged through a barometer 5, if the internal pressure of the material storage tank 17 is greater than the external atmospheric pressure and the difference value is greater than the A value, opening the second electromagnetic valve 7 and the third electromagnetic valve 13, closing the fourth electromagnetic valve 14, enabling the interior of the material storage tank 17 to be gradually communicated with the atmosphere until the difference value between the internal pressure of the material storage tank 17 and the external atmospheric pressure is less than the A value, enabling the internal pressure and the external pressure of the material storage tank 17 to be approximately balanced, and opening a cover plate 21 of a material; if storage tank 17 internal pressure is greater than outside atmospheric pressure but the difference is less than the A value, then directly open pan feeding mouth apron 21, add metal powder to storage tank 17 in, then screw pan feeding mouth apron 21, close second solenoid valve 7 and third solenoid valve 13 to make storage tank 17 isolated with the atmosphere, accomplish the blowing.
5.2 description of the scrubbing Process
The purpose of the scrubbing process is to remove oxygen from the interior of the storage tank 17 so that the high purity inert gas occupies the space of the storage tank 17 and the metal powder is protected by the high purity inert gas. The process comprises two key steps:
the method comprises the following steps of firstly, starting a vacuum pump 15, operating the vacuum pump 15, opening a second electromagnetic valve 7, a fourth electromagnetic valve 14, closing a main electromagnetic valve 3, a first electromagnetic valve 6 and a third electromagnetic valve 13, and maintaining for a certain time to enable the pressure in a material storage tank 17 to be less than 0.001 mbar;
secondly, closing the vacuum pump 15, closing the fourth electromagnetic valve 14, opening the main electromagnetic valve 3 and the first electromagnetic valve 6, filling high-purity inert gas into the material storage tank 17, maintaining for a certain time, and closing the main electromagnetic valve 3, the first electromagnetic valve 6 and the second electromagnetic valve 7 when the pressure reaches a B value;
and thirdly, repeatedly circulating the first step and the second step until the oxygen content measured by the detection port 4 is less than 1000ppm, and finishing the gas washing process.
5.3 description of the Process for obtaining Metal powder
And in the first step, the master electromagnetic valve 3 and the first electromagnetic valve 6 are closed, the second electromagnetic valve 7 and the third electromagnetic valve 13 are opened, and the pressure of the storage tank and the outside is balanced.
Secondly, when the internal pressure of the material storage tank 17 is greater than the external atmospheric pressure but the difference value is smaller than the value A, closing the second electromagnetic valve 7 and the third electromagnetic valve 13, connecting the material bottle with the material outlet 18, then opening the baffle valve 19, enabling the metal powder to flow into the material bottle, and controlling the quantity of the obtained metal powder according to the opening time and the opening size of the baffle valve 19; the flapper valve 19 is closed and the bottle is removed from the discharge port 18 to complete the dispensing.
5.4 description of Long term storage Process of Metal powders
When metal powder is in storage tank 17, the pressure-fired can prevent effectively that oxygen and steam among the outside air from getting into storage tank 17 inside, but has trace loss of pressure, also the inside inert gas that has of storage tank 17 constantly overflows, in order to maintain the pressure-fired, just need adopt automatic control system to control it, and the fundamental process is as follows:
firstly, the logic controller 16 always monitors the value of the barometer 5, if the pressure of the barometer 5 is 1% lower than one atmospheric pressure, the master electromagnetic valve 3 and the first air inlet electromagnetic valve 6 are automatically opened, and at the moment, all other electromagnetic valves are in a closed state, and the storage tank is inflated;
secondly, if the numerical value of the barometer 5 is 2% higher than one atmosphere, closing the main electromagnetic valve 3 and the first electromagnetic valve 6;
thirdly, safety guarantee measures are taken, if the value displayed by the barometer 5 still does not reach the preset value after the first electromagnetic valve 6 is opened for a period of time, the situation that air leaks from the storage tank 17 or the inert gas bottle 1 is short of air is represented, the logic controller 16 gives an alarm to prompt a user to replace the inert gas bottle; the specific monitoring time is determined according to the size and the inflation speed of the storage tank 17.
Examples
The frame 20 is formed by welding or connecting profile steels through bolts and is connected with the ground through the bolts; the material storage tank 17 is made of stainless steel, the typical size of the material storage tank is phi 500mm plus 500mm, the diameter of the material inlet 8 is 100mm, the diameter of the material outlet 18 is 50mm, the diameters of the air inlet 9 and the air outlet 11 are phi 8mm, and a quick connection plug is reserved and is connected with a corresponding electromagnetic valve through a hose; the detection port 4 is a standard industrial valve core, has the diameter of 5mm, and can be connected with an oxygen sensor, so that the oxygen content in the storage tank can be rapidly measured; the pressure gauge 5 is an industrial pressure sensor with a gauge head, the maximum detection pressure is 500mbar, the detection precision is 0.15%, the pressure of the material storage tank 17 can be accurately detected, and the detection result is transmitted to the central logic controller 16 through a 0-10V analog quantity signal; the argon bottle is connected with a pressure reducing valve 2, the pressure of the high-purity argon is reduced, and then the argon bottle is connected with an inert gas pipeline 10 through a main electromagnetic valve 3, and the argon pipeline is connected with an air inlet 9 of a storage tank 17 through a first electromagnetic valve 6; the gas outlet 11 of the storage tank 17 is connected with the exhaust pipeline 12 through the second electromagnetic valve 7, and is respectively connected with the third electromagnetic valve 13 and the fourth electromagnetic valve 14 through the tee 22, the third electromagnetic valve 13 is directly communicated with the atmosphere, and the fourth electromagnetic valve 14 is connected with the vacuum pump 15.
After the equipment is powered on and started, the main electromagnetic valve 3 is opened, the vacuum pump 15 is powered on and operated, the third electromagnetic valve 13 and the fourth electromagnetic valve 14 are closed, the first electromagnetic valve 6 and the second electromagnetic valve 7 are closed, and the system automatically enters a micro-positive pressure control mode.
Under the micro-positive pressure control mode, the logic controller 16 continuously monitors the pressure of the barometer 5, if the pressure of the barometer is lower than 5mbar, the first electromagnetic valve 6 is opened to supplement air into the material storage tank 17, and if the pressure is higher than 20mbar, the first electromagnetic valve 6 is closed to stop supplementing air, wherein the mode is the micro-positive pressure automatic control mode;
after new metal powder arrives, the metal powder needs to be added into the material storage tanks 17, the micro-positive pressure control mode of a certain material storage tank 17 needs to be quitted at first, then the feeding mode is switched, the logic controller 16 automatically controls the fourth electromagnetic valve 14 to be closed, controls the third electromagnetic valve 13 to be opened, and simultaneously controls the second electromagnetic valve 7 corresponding to the tank body to be powdered to be opened, at the moment, the internal and external pressures of the tank body are balanced, the green light indicator is on, and the new metal powder can be added into the tank body. After the feeding is finished, the feeding port is sealed, the tank body needs to be subjected to gas washing, and the purpose is to rapidly reduce the oxygen content and the water content in the tank body.
After the feeding is finished, the feeding port cover plate 21 of the feeding port 8 is covered, then the corresponding storage tank 17 gas washing button is selected, and the automatic gas washing is carried out by clicking. The automatic gas washing is the above-mentioned cycle process of repeatedly pumping and charging gas to the tank body, and generally circulates 3 times to ensure that the oxygen content in the tank body is reduced to 1000ppm once, thereby ensuring the low enough oxygen concentration. For example, for the first storage tank # 1, the scrubbing process is as follows:
After the washing is finished, the corresponding material storage tank 17 automatically enters the micro-positive pressure control mode, and the micro-positive pressure control mode is as described above.
If the metal powder needs to be taken, the material bottle is butted with the discharge hole, then the flapper valve is opened, the time for opening the flapper valve is controlled manually, the longer the time is, the more the metal powder flows out, and the less the metal powder flows out. And closing the baffle valve, detaching the material bottle, and adding metal powder into the additive manufacturing equipment to realize additive manufacturing printing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The storage system of the metal powder is characterized by comprising at least one storage tank (17), wherein each storage tank (17) is provided with a gas inlet (9) and a gas outlet (11), the gas inlet (9) is connected with a first electromagnetic valve (6), the gas outlet (11) is connected with a second electromagnetic valve (7), the first electromagnetic valve (6) is connected to an inert gas cylinder (1), the second electromagnetic valve (7) is connected to an exhaust pipeline (12), the terminal of the exhaust pipeline (12) is communicated to the atmosphere or a vacuum pump (15), the atmosphere or the vacuum pump (15) is communicated with the terminal of the exhaust pipeline (12) side by side, a third electromagnetic valve (13) is arranged between the terminal of the exhaust pipeline (12) and the atmosphere, and a fourth electromagnetic valve (14) is arranged between the exhaust pipeline (12) and the vacuum pump (15); the material storage tank (17) is connected with a barometer (5); the upper end of the material storage tank (17) is provided with a feeding port (8), and the lower end is provided with a discharging port (18);
the air pressure meter (5), the first electromagnetic valve (6), the second electromagnetic valve (7), the third electromagnetic valve (13) and the fourth electromagnetic valve (14) are all connected to a logic controller (16);
when the storage tank (17) is filled with metal materials, the storage tank (17) is filled with inert gas, and the pressure of the inert gas is 1% -2% higher than the atmospheric pressure; the oxygen content in the storage tank (17) is less than 1000 ppm.
2. A storage system of metal powder according to claim 1, characterized in that a main solenoid valve (3) is provided between the first solenoid valve (6) and the inert gas cylinder (1), and a pressure reducing valve (2) is provided between the main solenoid valve (3) and the inert gas cylinder (1); the master solenoid valve (3) is connected to a logic controller (16).
3. A storage system for metal powder according to claim 1, wherein the storage tank (17) is connected to a detection port (4), and the detection port (4) is connected to an oxygen content detection sensor.
4. A storage system for metal powder according to claim 1, wherein a moisture meter (23) is connected to the storage tank (17).
5. A storage system for metal powder according to claim 1, wherein the storage tanks (17) are all provided on a frame (20), the frame (20) being ground treated.
6. A storage system for metal powder according to claim 1, wherein the inlet (8) is screw-connected with an inlet cover plate (21).
7. A storage system for metal powder according to claim 1, wherein a flapper valve (19) is arranged in the discharge opening (18).
8. A storage system for metal powder according to claim 1, wherein the storage tank (17) is of stainless steel.
9. A method for using the storage system of metal powder of claim 1, which is divided into the processes of adding metal powder, washing gas and blanking;
a process of adding metal powder;
the difference between the internal pressure and the external pressure of the storage tank (17) is judged through the barometer (5), if the difference is larger than the value A, the second electromagnetic valve (7) and the third electromagnetic valve (13) are opened, the fourth electromagnetic valve (14) is closed, the storage tank (17) is communicated with the atmosphere until the internal pressure of the storage tank (17) is the external atmospheric pressure, and the feeding port (8) is opened for feeding; if the difference value between the internal pressure and the external atmospheric pressure of the material storage tank (17) is smaller than the value A, directly opening the material inlet (8) for feeding, closing the material inlet (8) after feeding, and closing the third electromagnetic valve (13) to isolate the material storage tank (17) from the atmosphere;
a process of scrubbing;
closing the first electromagnetic valve (6), and opening the second electromagnetic valve (7) and the fourth electromagnetic valve (14) to dry the gas in the material storage tank (17) by the vacuum pump (15); closing the second electromagnetic valve (7), opening the first electromagnetic valve (6), filling inert gas into the storage tank (17), and closing the first electromagnetic valve (6) when the barometer (5) displays that the pressure in the storage tank (17) reaches a set value B; repeating the pumping and inflating processes repeatedly until the oxygen content in the material storage tank (17) is less than 1000ppm, and finishing the gas washing process;
blanking;
and closing the main electromagnetic valve (3) and the first electromagnetic valve (6), opening the second electromagnetic valve (7) and the third electromagnetic valve (13), and opening the discharge hole (18) of the storage tank (17) when the difference value of the internal pressure and the external atmospheric pressure of the storage tank (17) is less than the value A.
10. The method of using a storage system for metal powder according to claim 9, wherein the a value is 0.1KPa during the addition of the metal powder; in the process of gas washing, the set value B is 0.5-5KPa greater than the atmospheric pressure.
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Application publication date: 20201204 |