CN113218188B - Oil discharge device for powder metallurgy processing - Google Patents
Oil discharge device for powder metallurgy processing Download PDFInfo
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- CN113218188B CN113218188B CN202110399787.3A CN202110399787A CN113218188B CN 113218188 B CN113218188 B CN 113218188B CN 202110399787 A CN202110399787 A CN 202110399787A CN 113218188 B CN113218188 B CN 113218188B
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- pipe
- water
- oil
- powder metallurgy
- vacuum
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- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000001816 cooling Methods 0.000 claims abstract description 44
- 238000005245 sintering Methods 0.000 claims abstract description 15
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000000498 cooling water Substances 0.000 claims description 18
- 238000002955 isolation Methods 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 11
- 238000001914 filtration Methods 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
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- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1545—Equipment for removing or retaining slag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/33—Self-supporting filtering elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
-
- 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
- F27D19/00—Arrangements of controlling devices
-
- 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
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
-
- 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
- F27D9/00—Cooling of furnaces or of charges therein
-
- 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
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers
- F27D2007/066—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
- F27D9/00—Cooling of furnaces or of charges therein
- F27D2009/0002—Cooling of furnaces
- F27D2009/001—Cooling of furnaces the cooling medium being a fluid other than a gas
- F27D2009/0013—Cooling of furnaces the cooling medium being a fluid other than a gas the fluid being water
-
- 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
- F27D19/00—Arrangements of controlling devices
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Furnace Details (AREA)
Abstract
The invention discloses an oil discharge device for powder metallurgy processing, which comprises a vacuum pump and a vacuum furnace, wherein the vacuum pump is communicated with a vacuum sintering cavity of the vacuum furnace through a vacuum pumping pipeline, a drainage tube penetrates through the side wall of the vacuum pump, and the other end of the drainage tube is connected with an oil inlet box; the oil inlet box is internally provided with a spiral cooling pipe, the two ends of the spiral cooling pipe are fixedly connected with a water inlet pipe and a water outlet pipe, and the other end of the water inlet pipe is connected with the water tank. The oil discharge device for powder metallurgy processing can be used for conveniently and rapidly filtering and cooling discharged oil, removing impurities in the oil, facilitating oil recycling and bringing better use prospect.
Description
Technical Field
The invention relates to the technical field of glue discharging of vacuum pumps of powder metallurgy vacuum sintering furnaces, in particular to an oil discharging device for powder metallurgy processing.
Background
Powder metallurgy forming is one of the basic processes in powder metallurgy production, with the aim of forming a semifinished product with a predetermined geometry, size, density and strength from loose (metal, ceramic, or other material) powder by pressing in a mould, and then obtaining the semifinished blank by demoulding. The semi-finished product is changed into a finished product at least through a subsequent sintering process, and a vacuum sintering furnace is required to be used when the sintering process is carried out.
The vacuum sintering furnace is a furnace for protectively sintering a heated material in a vacuum environment, and the heating method is relatively many. The vacuum induction sintering furnace is complete equipment for sintering hard alloy tool bits and various metal powder pressed bodies by utilizing the principle of medium-frequency induction heating under the condition of vacuum or protective atmosphere, and is designed for industrial production of hard alloys, metal dysprosium and ceramic materials.
When the vacuum sintering furnace is used for sintering, a vacuum pump is used for pumping out additives and air in products in the furnace to remove the additives and the air, so that the vacuum pump has attached solid impurities in the vacuum pump, and the attachments in oil liquid need to be removed. The existing oil discharge device has certain defects when in use, and oil is pumped out by original pumps and is stored in an oil storage tank in the pumps, so that the impurity condition in a sintering furnace is difficult to judge on one hand, and the damage of a vacuum pump is easy to cause.
Disclosure of Invention
The invention mainly aims to provide an oil discharge device for powder metallurgy processing, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that: a vacuum pump oil discharge device for powder metallurgy comprises a vacuum pump and a vacuum furnace, wherein the vacuum pump is communicated with a vacuum sintering cavity of the vacuum furnace through a vacuum pumping pipeline, a drainage tube penetrates through the side wall of the vacuum pump, and the other end of the drainage tube is connected with an oil inlet box; the drainage tube is hollow, one end of the drainage tube is connected with the vacuum pump, and the other end of the drainage tube extends into the position below oil liquid. The oil inlet box is internally provided with a spiral cooling pipe, the two ends of the spiral cooling pipe are fixedly connected with a water inlet pipe and a water outlet pipe, and the other end of the water inlet pipe is connected with a water pump or a water tank.
Preferably, the clamping seat is installed at the bottom of the inner cavity of the oil inlet box, and the detachable isolating cylinder is sleeved on the clamping seat.
Preferably, the isolation cylinder is a hollow cylinder with openings at two ends, a plurality of round holes are formed in the side wall of the isolation cylinder in an equidistant surrounding mode, and the round holes penetrate through the side wall of the isolation cylinder.
Preferably, the spiral cooling pipe is arranged around the outer cylindrical surface of the isolation cylinder, the upper end of the spiral cooling pipe is connected with the water outlet pipe, and the lower end of the spiral cooling pipe is connected with the water inlet pipe; the water inlet pipe, the spiral cooling pipe and the water outlet pipe form a cooling channel, and flowing cooling water is filled in the cooling channel.
Preferably, the spiral cooling pipe is a copper pipe, and the temperature of the cooling liquid generated in the pipe body can be conducted into external oil liquid.
Preferably, the water inlet pipe and the water outlet pipe are both provided with temperature detectors, one of which is arranged at the water inlet of the water inlet pipe, and the other is arranged at the water outlet of the water outlet pipe.
Preferably, one end of the water inlet pipe, which is close to the water tank, is connected with a water pump, the water pump is provided with a flow control system, the temperature detectors, the flow controller and the control system are in communication connection, and the two temperature detectors are used for detecting the temperature before and after cooling of the cooling water and providing detected data for the control system; the control system calculates the heat absorbed by the cooling water, and compares the data of the first temperature detector with the temperature value set by the control system according to the data detected by the two temperature detectors to adjust the flow of the cooling water.
Compared with the prior art, the invention has the following beneficial effects: this oil extraction device is used in powder metallurgy processing, when metallurgical through the vacuum furnace, impurity can be adsorbed by fluid, consequently need through a oil pipe with the leading-in oil tank that advances of fluid that contains impurity, not only can filter the impurity in the fluid through an isolation section of thick bamboo, can also cool off through the spiral cooling tube. When the cooling channel works, cooling water circularly flows in the spiral cooling pipe under the action of the water pump to cool oil, so that the cooling water is fully contacted with the spiral cooling pipe, and the cooling efficiency is accelerated.
When the cooling channel works, the temperature before and after cooling of the cooling water can be detected through the temperature detector, and detected data are provided for the control system; the control system calculates the heat absorbed by the cooling water, and compares the data of the first temperature detector with the temperature value set by the control system according to the data detected by the two temperature detectors to adjust the flow of the cooling water.
In conclusion, the oil-gas separation device can discharge oil containing impurities in the vacuum pump into the oil inlet tank, the vacuum pump is kept clean and not damaged, meanwhile, the oil in the oil inlet tank can be cooled, observation is convenient, the whole device works flexibly, automatic work can be realized, labor force is saved, the whole working efficiency is improved, and the using effect is better than that of the traditional mode.
Drawings
Fig. 1 is a schematic view of the overall structure of an oil discharge device for powder metallurgy processing according to the present invention.
Fig. 2 is a schematic structural view of the spiral cooling pipe in fig. 1 of an oil discharge device for powder metallurgy processing according to the present invention.
FIG. 3 is a schematic structural view of an oil feed tank in FIG. 1 of an oil discharge apparatus for powder metallurgy processing according to the present invention.
In the figure: 1. an oil inlet box; 2. a spiral cooling tube; 3. a vacuum pump; 4. a vacuum furnace; 5. a water inlet pipe; 6. a water outlet pipe; 7. a vacuum pipeline is pumped; 8. a card holder; 9. an isolation cylinder.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-3, an oil discharge device for powder metallurgy processing comprises a vacuum pump 3 and a vacuum furnace 4, wherein the vacuum pump 3 is communicated with a vacuum sintering cavity of the vacuum furnace 4 through a vacuum pumping pipeline 7, a drainage pipe penetrates through the side wall of the vacuum pump 3, and the other end of the drainage pipe is connected with an oil inlet tank 1; the drainage tube is hollow, one end of the drainage tube is connected with the vacuum pump, and the other end of the drainage tube extends into the position below oil liquid. The oil inlet tank 1 is internally provided with a spiral cooling pipe 2, the two ends of the spiral cooling pipe 2 are fixedly connected with an inlet pipe 5 and an outlet pipe 6, and the other end of the inlet pipe 7 is connected with a water tank.
In this embodiment, a clamping seat 8 is installed at the bottom of an inner cavity of the oil inlet tank 1, and a detachable isolating cylinder 9 is sleeved on the clamping seat 8; the isolation cylinder 9 is a hollow cylinder with two open ends, the isolation cylinder 9 is detachably connected with the clamping seat 8, so that the isolation cylinder 9 can be detached from the clamping seat 8, the isolation cylinder 9 can be replaced conveniently, and the impurities filtered in the isolation cylinder 9 can be cleaned.
In the embodiment, one end of the drainage tube extends into the bottom of the oil inlet box; the side wall of the isolation cylinder 9 is provided with a plurality of round holes at equal intervals in a surrounding mode, and the round holes penetrate through the side wall of the isolation cylinder 9. Particularly, the upper end of the side wall of the isolating cylinder 9 is provided with 2 rows of round holes distributed at equal intervals, so that solid filter residues in oil can be conveniently filtered.
In the embodiment, the spiral cooling pipe 2 is arranged around the outer cylindrical surface of the isolation cylinder 9, the upper end of the spiral cooling pipe is connected with the water outlet pipe 6, and the lower end of the spiral cooling pipe is connected with the water inlet pipe 5; the water inlet pipe 5, the spiral cooling pipe 2 and the water outlet pipe 6 form a cooling channel, and flowing cooling water is filled in the cooling channel.
In the present embodiment, the spiral cooling pipe 2 is a copper pipe.
In this embodiment, the water inlet pipe 5 and the water outlet pipe 6 are both provided with temperature detectors, one of which is arranged at the water inlet of the water inlet pipe, and the other is arranged at the water outlet of the water outlet pipe.
In this embodiment, the inlet tube is close to water tank one end and is connected with the water pump, be equipped with flow control system on the water pump, temperature detector, flow controller and control system communication connection.
The working principle and the using process of the invention are as follows: when the vacuum furnace is used, impurities can be adsorbed by oil when the vacuum furnace 4 is used for metallurgy, the oil containing the impurities is guided into the oil inlet box 1 through the oil outlet pipe 5, and the impurities in the oil are filtered through the isolation cylinder 9; when the cooling channel works, the control system controls the water pump to be opened, so that the temperature detectors and the flow controller are in a working state, cooling water flows into the spiral cooling pipe 2 from one end of the water inlet pipe, the cooling water circularly flows in the cooling channel under the action of the water pump, heat is dissipated outside the copper pipe, oil is cooled, and then the cooling water flows into the water tank, the two temperature detectors detect the temperature before and after cooling of the cooling water, and provide detected data for the control system; the control system calculates the heat absorbed by the cooling water, and compares the data of the first temperature detector with the temperature value set by the control system according to the data detected by the two temperature detectors to adjust the flow of the cooling water.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an oil extraction device is used in powder metallurgy processing, includes vacuum pump (3), vacuum furnace (4), its characterized in that: the vacuum pump (3) is communicated with a vacuum sintering cavity of the vacuum furnace (4) through a vacuum pumping pipeline (7), a drainage tube penetrates through the side wall of the vacuum pump (3), and the other end of the drainage tube is connected with the oil inlet box (1); a spiral cooling pipe (2) is arranged in the oil inlet box (1), two ends of the spiral cooling pipe (2) are fixedly connected with a water inlet pipe (5) and a water outlet pipe (6), and the other ends of the water inlet pipe (5) and the water outlet pipe (6) are connected with a water tank; the bottom of the inner cavity of the oil inlet box (1) is provided with a clamping seat (8), the clamping seat (8) is sleeved with a detachable isolating cylinder (9), the spiral cooling pipe (2) is arranged around the outer cylindrical surface of the isolating cylinder (9), the upper end of the spiral cooling pipe is connected with the water inlet pipe (5), and the lower end of the spiral cooling pipe is connected with the water outlet pipe (6); the water inlet pipe (5), the spiral cooling pipe (2) and the water outlet pipe (6) form a cooling channel, and flowing cooling water is filled in the cooling channel.
2. The oil discharge device for powder metallurgy processing according to claim 1, wherein: the isolation cylinder (9) is a hollow cylinder with two open ends.
3. The oil discharge device for powder metallurgy processing according to claim 2, wherein: the side wall of the isolation cylinder is provided with a plurality of round holes at equal intervals in a surrounding mode, and the round holes penetrate through the side wall of the isolation cylinder.
4. The oil discharge device for powder metallurgy processing according to claim 3, wherein: the spiral cooling pipe (2) is a copper pipe.
5. The oil discharge device for powder metallurgy processing according to any one of claims 1 to 4, wherein: the temperature detector is arranged on each of the water inlet pipe (5) and the water outlet pipe (6), one of the temperature detectors is arranged at the water inlet of the water inlet pipe (5), and the other temperature detector is arranged at the water outlet of the water outlet pipe (6).
6. The oil discharge device for powder metallurgy processing according to claim 5, wherein: inlet tube (5) are close to water tank one end and are connected with the water pump, be equipped with flow control system on the water pump, temperature detector, flow controller and control system communication connection, control system controls the flow that flow controller adjusted the cooling water according to the data control flow that temperature detector detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110399787.3A CN113218188B (en) | 2021-04-14 | 2021-04-14 | Oil discharge device for powder metallurgy processing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110399787.3A CN113218188B (en) | 2021-04-14 | 2021-04-14 | Oil discharge device for powder metallurgy processing |
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| Publication Number | Publication Date |
|---|---|
| CN113218188A CN113218188A (en) | 2021-08-06 |
| CN113218188B true CN113218188B (en) | 2021-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110399787.3A Active CN113218188B (en) | 2021-04-14 | 2021-04-14 | Oil discharge device for powder metallurgy processing |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011021850A (en) * | 2009-07-17 | 2011-02-03 | Tounetsu Co Ltd | One chamber type vacuum furnace |
| CN202105497U (en) * | 2011-05-19 | 2012-01-11 | 山东红星化工有限公司 | Kettle bottom filtering device for lubricating grease preparation kettle |
| CN111451498A (en) * | 2020-02-28 | 2020-07-28 | 福建省长汀金龙稀土有限公司 | Degreasing method for powder metallurgy sintering |
| CN213841821U (en) * | 2020-11-27 | 2021-07-30 | 苏州创卓精密制造有限公司 | Degreasing and dewaxing condenser of powder injection molding sintering furnace |
-
2021
- 2021-04-14 CN CN202110399787.3A patent/CN113218188B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011021850A (en) * | 2009-07-17 | 2011-02-03 | Tounetsu Co Ltd | One chamber type vacuum furnace |
| CN202105497U (en) * | 2011-05-19 | 2012-01-11 | 山东红星化工有限公司 | Kettle bottom filtering device for lubricating grease preparation kettle |
| CN111451498A (en) * | 2020-02-28 | 2020-07-28 | 福建省长汀金龙稀土有限公司 | Degreasing method for powder metallurgy sintering |
| CN213841821U (en) * | 2020-11-27 | 2021-07-30 | 苏州创卓精密制造有限公司 | Degreasing and dewaxing condenser of powder injection molding sintering furnace |
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| CN113218188A (en) | 2021-08-06 |
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