CN111288765A - Semi-automatic drying device for metal powder - Google Patents
Semi-automatic drying device for metal powder Download PDFInfo
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- CN111288765A CN111288765A CN201910928717.5A CN201910928717A CN111288765A CN 111288765 A CN111288765 A CN 111288765A CN 201910928717 A CN201910928717 A CN 201910928717A CN 111288765 A CN111288765 A CN 111288765A
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- 239000000843 powder Substances 0.000 title claims abstract description 88
- 238000001035 drying Methods 0.000 title claims abstract description 46
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 22
- 239000002184 metal Substances 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 239000000498 cooling water Substances 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 30
- 238000007599 discharging Methods 0.000 claims description 8
- 230000007306 turnover Effects 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000007789 gas Substances 0.000 abstract description 4
- 238000006213 oxygenation reaction Methods 0.000 abstract description 4
- 239000002918 waste heat Substances 0.000 abstract description 3
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- 238000001291 vacuum drying Methods 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 229910018540 Si C Inorganic materials 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000001694 spray drying Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Sustainable Development (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a semi-automatic drying device for metal powder. The device comprises a furnace body, a nitrogen input device and an air draft device, so that gas in the furnace is smooth, water vapor is favorably taken away, powder agglomeration is eliminated by the arrangement of a mechanical arm, the powder drying speed is accelerated, the powder is dried by using the waste heat of low-temperature circulating cooling water flowing out of an intermediate frequency smelting furnace, the oxygenation behavior in the powder drying process is eliminated, and the device is a novel device which is environment-friendly, energy-saving and capable of realizing flow production.
Description
Technical Field
The invention relates to the field of powder metallurgy powder manufacturing equipment manufacturing, in particular to a semi-automatic drying device for metal powder.
Background
The first step of powder metallurgy is to prepare a powder raw material. The powder preparation method has various methods, such as protective ball milling powder preparation and chemical wet metallurgy powder preparation, and the most used method is atomization powder preparation at present. The atomization method belongs to a powder preparation method with small pollution and high speed, and is divided into air-jet cooling, air-jet cooling and water-jet cooling, and all the water-cooled powder can not be separated from a drying device.
Powder drying is a process and is a study, because it relates to the quality of the powder and the subsequent treatment process of the powder, in particular to the problem of safe production of inflammable and explosive powder.
At present, the drying devices almost adopted by a plurality of medium and small-sized powder manufacturing companies are a box-type resistance furnace and a vacuum drying furnace. The box type resistance furnace has the unique advantages of simple operation and the defects of uneven temperature control in the furnace, high and low drying speed, burning of powder due to frequent safety accidents and frequent oxygenation of powder quality. Vacuum drying is the first choice device of flammable and explosive powder, and its dry quality is considered the most guaranteed in people's mind, and it is not known that this kind of drying device apart from drying speed is slow, even has the trend of oxygenation phenomenon to the powder that contains active metal element. The reason of slow drying speed is that the powder is hardened under vacuum condition, which causes slow water evaporation, and the reason of oxygen increase is that the content of active metal elements in the powder is high, and the powder can not turn over and is agglomerated. Under the vacuum condition, because the working principle of the vacuum pump is to pump away gas, the generation of the gas needs a certain high temperature to evaporate water, and in the evaporation process, the active metal and the water generate hydrolysis reaction, the reaction process is the oxidation process of the powder, and certainly, the activity of the ultra-micro powder is also high, and the powder is also easy to oxidize. Vacuum drying is thus not a device for which the quality of the powder is very guaranteed.
The spray drying tower is an advanced device developed in recent years, and has the advantages of high drying speed, capability of instantly removing most of water when materials are contacted with high-pressure hot air, and capability of completely drying powder when the powder continuously flies to a collection bin, so that the yield of the spray drying tower is particularly high. Because the same spray drying apparatus is not suitable for powders of different compositions and varieties.
In this context, the invention designs a semi-automatic drying device for metal powder.
Disclosure of Invention
The invention aims to solve the technical problems that the low-temperature waste heat is utilized to quickly dry metal or alloy powder, the technical problem that a box type resistance furnace is easy to oxidize and burn is eliminated, the possible oxygen increasing problem of a vacuum drying furnace and the problem that continuous production cannot be realized are solved, and the technical effects of semi-automatic quick drying and energy saving are achieved.
The invention aims to provide a semi-automatic metal powder drying device, which changes the high-energy consumption closed operation of a box-type resistance furnace and a vacuum drying furnace into semi-automatic flow operation, realizes low-temperature quick drying, and meets the requirements of multiple brands and varieties in powder production.
In order to realize the purpose, the invention adopts the following technical scheme to realize the purpose:
the utility model provides a metal powder semi-automatization drying device, includes furnace body, air inlet unit, air exhaust device, manipulator, material dish and U type pipe, and wherein the inlet tube designs into the U type pipe, inserts the furnace body bottom, and the U type pipe is equivalent to the bracket of material dish, and the furnace body is inside to have a plurality of material dishes, and the material dish is put and is conducted heat soon on the hot-water line, and the little easy promotion of the little frictional force of area of contact, furnace body both ends divide into feeding furnace gate and ejection of compact furnace gate, and the business turn over material dish is by manual.
An air inlet is arranged on one side of the top of the furnace body close to the feeding furnace door, and an air exhaust opening is arranged on one side of the top of the furnace body close to the discharging furnace door.
Further, the air inlet device comprises a nitrogen cylinder, a pressure reducing valve and an air inlet pipe, and the air exhaust device comprises an exhaust fan and an exhaust pipe;
one end of the air inlet pipe is connected with the pressure reducing valve, the other end of the air inlet pipe is connected with the air inlet, and the nitrogen cylinder is connected with the pressure reducing valve;
one end of the exhaust pipe is connected with the exhaust fan, the other end of the exhaust pipe is connected with the exhaust opening, and the entering gas is exhausted by the exhaust fan, so that flowing air exists in the furnace, and the powder drying speed can be accelerated.
Furthermore, the mechanical arm is at least provided with two parts, the two parts are fixed above the furnace body and can stretch into the material tray in the furnace to automatically turn over the powder, after the powder is dried for a period of time, the mechanical arm is opened to automatically stretch hands and slightly turn over the powder in the tray for two minutes, and the powder is automatically withdrawn after the powder is dried, so that the problem of powder agglomeration is solved.
Furthermore, circulating cooling water flowing out of the medium-frequency smelting furnace belongs to low-temperature hot water, is introduced into one end of the U-shaped pipe and enters the other end of the U-shaped pipe to be discharged, the water outlet of the circulating cooling water is slightly higher than the water inlet of the circulating cooling water to ensure that the pipeline is filled with water, and then the circulating cooling water is introduced into the circulating water pool, and the water inlet is arranged at the water inlet.
Furthermore, the feeding and discharging furnace doors at two ends of the furnace body are provided with furnace doors, the furnace doors are closed after feeding and discharging are completed, the design of the furnace doors ensures the atmosphere in the furnace, the entering of external air is reduced, and meanwhile, dust pollution powder in the air is isolated.
The invention has the beneficial effects that:
1. the circulating cooling water of the intermediate frequency smelting furnace is used, the waste heat with the temperature of about 45-60 ℃ is used for low-temperature drying, and the heat source is stable, safe and environment-friendly.
2. The furnace body is simple to manufacture, low in cost and convenient to operate, can realize continuous boat pushing and flow production, and meets the actual production requirements of various powder types and multiple brands.
3. By using the device, the quality of the powder has no oxygen increasing reflection.
4. The yield of the device is 3-4 times higher than that of vacuum drying.
5. The device has the advantages of uniform drying temperature, lower labor intensity than a box-type resistance furnace, no heating device and no burning out of metal powder.
Drawings
Fig. 1 is a schematic structural diagram of a semi-automatic drying device for metal powder provided by the present invention;
FIG. 2 is a schematic structural view of a U-shaped tube of the present invention.
In the figure: 1. a furnace body; 2. an air intake device; 201. a nitrogen gas cylinder; 202. a pressure reducing valve; 203. an air inlet pipe; 3. an air extraction device; 301. an exhaust fan; 302. an air exhaust pipe; 4. a manipulator; 401. a first manipulator; 402. a second manipulator; 5. a material tray; 6. a U-shaped pipe; 601. a water inlet; 602. a water inlet valve; 603. a hot water pipe of the intermediate frequency furnace; 604. a water outlet; 605. a water outlet pipe; 606 circulating the water pool; 7. an air inlet; 8. an air extraction opening; 9. a feed oven door; 10. and a discharging furnace door.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
Referring to fig. 1-2, a semi-automatic drying device for metal powder comprises a furnace body 1, an air inlet device 2, an air exhaust device 3, a manipulator 4, a material tray 5 and a U-shaped pipe 6, wherein the water inlet pipe is designed into the U-shaped pipe 6 and inserted into the bottom of the furnace body 1, the U-shaped pipe 6 is equivalent to a bracket of the material tray 5, the furnace body 1 is internally provided with a plurality of material trays 5, the material tray 5 is placed on a hot water pipe for fast heat transfer, the contact area is small, the friction force is small, the material tray 5 is easy to push, two ends of the furnace body 1 are divided into a feeding furnace door 9 and a discharging furnace door 10, and the.
An air inlet 7 is arranged on one side of the top of the furnace body 1 close to a feeding furnace door 9, and an air exhaust opening 8 is arranged on one side of the top of the furnace body 1 close to a discharging furnace door 10.
Wherein, the air inlet device 2 comprises a nitrogen cylinder 201, a pressure reducing valve 202 and an air inlet pipe 203, and the air exhaust device 3 comprises an exhaust fan 301 and an exhaust pipe 302; the nitrogen cylinder 201 is connected with the pressure reducing valve 202, and the air inlet pipe 203 is connected with the air inlet 7; one end of the air exhaust pipe 302 is connected with the exhaust fan 301, the other end of the air exhaust pipe is connected with the air exhaust port 8, and the entering air is exhausted by the exhaust fan 301, so that flowing air exists in the furnace, and the powder drying speed can be accelerated.
Wherein, the manipulator 4 is provided with two and fixes and is in furnace body 1 top and can stretch into the automatic powder that stirs in the material dish 5 of stirring in the stove, and after the powder is dry for a period, opens the automatic hand that stretches of manipulator 4 and stirs the powder in the dish gently for two minutes, withdraws automatically after accomplishing, and manipulator 4 has solved the powder caking problem.
Wherein, the cooling water of the intermediate frequency smelting furnace enters the U-shaped pipe 6 through the pipeline 603, the valve 602 and the water inlet 601, and then enters the circulating water tank 606 from the water outlet 604 through the water outlet pipe 605, the water outlet 604 is slightly higher than the water inlet 601 to ensure that the pipeline is filled with water, and then the cooling water is introduced into the circulating water tank 606, and the water inlet valve 602 is arranged at the water inlet 601.
Wherein, the business turn over material at furnace body 1 both ends is provided with feeding furnace gate 9 and ejection of compact furnace gate 10, closes the furnace gate after the feeding ejection of compact is accomplished, and the furnace atmosphere has been guaranteed in the design of furnace gate, has reduced the entering of outside air, has also completely cut off the raise dust pollution powder in the air simultaneously.
Example 1
In the embodiment, iron-based matrix powder used in the diamond product industry is adopted, the production process is cooling in nitrogen atomized water, the main element is Fe-P-Cu-C alloy powder, and drying is carried out according to the usual actual production process; putting six disks of powder into a box-type resistance furnace, setting the control temperature within 130 ℃, manually turning materials in the disks in the drying process, drying some disks firstly and drying some disks later in the process, indicating that the temperature in the furnace is uneven, taking forty-five minutes after all the disks are dried, but changing the color of the powder by naked eyes.
The drying step of the powder using the apparatus of the present invention is:
①, opening the water inlet valve 602 to let the residual hot water fill the U-shaped pipe 6;
②, opening the feeding furnace door 9, putting two disks of materials and closing the furnace door, then opening the nitrogen bottle 201 to adjust the pressure reducing valve 202 to control the flow, letting nitrogen enter the furnace, opening the exhaust fan 301 within 3-5 minutes, letting the nitrogen flow in the furnace;
③ adding a plate of material every 20 minutes, when the fourth plate of material is pushed in, the first mechanical hand 401 is automatically opened to turn over the first plate of material, and is automatically closed after about 2 minutes, then when the furnace door 9 is closed for each additional plate of material, the first mechanical hand 401 is automatically opened for 2 minutes, when the ninth plate of material is entered, the second mechanical hand 402 is automatically opened to turn over the first plate of material for the second time, the time is still 2 minutes, with the same procedure, the second mechanical hand 402 turns over each plate of material for the second time, when the material enters the thirteenth plate, the first plate of material is opened by the discharging furnace door 10.
Finally, the two apparatus-dried powders were subjected to O2The content analysis results are as follows: drying of powder O in the apparatus of the invention20.176% content, powder O dried in box-type resistance furnace2The content is 0.228%.
Example 2
The device of the invention is used for drying the Fe-Cr-B-Si-C thermal spray welding alloy powder, and the treatment process is still carried out according to the production process of the embodiment 1; the powder is produced by a nitrogen atomization water cooling process, fifty kilograms of Fe-Cr-B-Si-C powder and fifty kilograms of Fe-P-Cu-C powder are conveyed to an external unit, and the powder is dried in a vacuum furnace, the drying temperature is set within 150 ℃, and the drying takes five hours and fifty minutes.
Finally, the oxygen content of the powder was analyzed, and the results were: Fe-Cr-B-Si-C powder O dried by the device of the invention20.826% of vacuum dried Fe-Cr-B-Si-C powder O20.83% content of O in vacuum-dried Fe-P-Cu-C powder2The content is 0.195%.
Therefore, when the content of active metal in the powder is high, oxygen is increased during drying under the vacuum condition because the ① powder cannot be turned over under the vacuum condition, the drying time is prolonged, ② vacuum drying temperature is high, the drying time is long, water can be pumped away only by evaporating at high temperature, and hydrolysis reaction is generated in the process, namely P and O2Take part in chemical reaction to result in O2The content is increased. The semi-automatic drying device for the metal powder just eliminates the defects of vacuum drying and box type resistance furnace drying, and is an ideal device for solving the oxygenation problem.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (6)
1. The utility model provides a metal powder semi-automatization drying device, its characterized in that, it includes furnace body, air inlet unit, air exhaust device, manipulator, material dish and U type pipe, U type pipe fixed mounting is in the furnace body bottom, the material dish place in on the U type pipe, the furnace body both ends divide into feeding furnace gate and ejection of compact furnace gate, the furnace body top is close to feeding furnace gate one side and is provided with the air inlet, the furnace body top is close to ejection of compact furnace gate one side and is provided with the extraction opening.
2. The semi-automatic drying device for metal powder as claimed in claim 1, wherein the air inlet device comprises a nitrogen cylinder, a pressure reducing valve and an air inlet pipe, and the air exhaust device comprises an exhaust fan and an exhaust pipe;
one end of the air inlet pipe is connected with the pressure reducing valve, the other end of the air inlet pipe is connected with the air inlet, the nitrogen cylinder is connected with the pressure reducing valve, one end of the air exhaust pipe is connected with the exhaust fan, and the other end of the air exhaust pipe is connected with the air exhaust port.
3. The semi-automatic metal powder drying device according to claim 1, wherein the manipulator is provided with at least two manipulators, the manipulators are fixed above the furnace body and can extend into the material tray to automatically turn over the powder in the material tray, and the manipulator can automatically retract the powder after the powder is finished.
4. The semi-automatic drying device for metal powder as claimed in claim 1, wherein the U-shaped tube comprises a water inlet and a water outlet, the water outlet is slightly higher than the water inlet in vertical height, and a water inlet valve is arranged at the water inlet.
5. The semi-automatic drying device for metal powder as claimed in claim 4, wherein the water inlet of the U-shaped pipe is connected with circulating cooling water discharged from the intermediate frequency smelting furnace.
6. The semi-automatic drying device for metal powder as claimed in claim 1, wherein the feeding and discharging positions are provided with oven doors.
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| CN201910928717.5A CN111288765A (en) | 2019-09-28 | 2019-09-28 | Semi-automatic drying device for metal powder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112556341A (en) * | 2020-12-16 | 2021-03-26 | 苏州宝馨科技实业股份有限公司 | Negative pressure drying device |
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