CN1676249A - Method and apparatus for preparing sheet-type metal pwoder by atomized drop deformation - Google Patents
Method and apparatus for preparing sheet-type metal pwoder by atomized drop deformation Download PDFInfo
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- CN1676249A CN1676249A CN 200510011622 CN200510011622A CN1676249A CN 1676249 A CN1676249 A CN 1676249A CN 200510011622 CN200510011622 CN 200510011622 CN 200510011622 A CN200510011622 A CN 200510011622A CN 1676249 A CN1676249 A CN 1676249A
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Abstract
The present invention relates to a method for preparing flake metal powder by means of atomizing liquid drop deformation. Said method includes the following steps: heating and melting metal raw material, then making the molten metal be passed through the discharge spout of crucible bottom portion according to stable flow rate of 3-30g/sec. And be poured onto the center of disk rotated at high speed, the rotating speed of the disk is 1000-5000 rpm, under the action of centrifugal force atomizing and forming so as to obtain the invented product. Said equipment comprises, smelting crucible, rotating disk atomizer, drive motor, atomizing chamber, bearing and water-cooling chamber.
Description
Technical field
The invention belongs to the metal dust preparing technical field, a kind of method and apparatus of preparing sheet-type metal pwoder by atomized drop deformation particularly is provided.
Background technology
The flake metal powder material has application very widely at coating and electronic applications, can be used for ornamental pigment, anticorrosion with coating, electromagnetic screen coating, conductive slurry, conducting polymer and conduction sintered body etc.In addition, in technology such as telecommunication, radar, TV, power supply, adopt flaky metal powder to make the magnetic core, can significantly reduce its high-frequency vortex loss, improve the high frequency characteristics of magnetic core.
At present, the method for preparing flake metal powder both at home and abroad mainly is a ball-milling method, promptly adopt first mist projection granulating again the secondary operations deformation method of ball milling processing prepare flaky metal powder.At application number is 01103176.X, name is called in the patent application of " flakey alloyed powder production technology " and discloses a kind of method that is specially adapted to produce Dacroment flake zinc powder, aluminium powder, by choosing granularity between the 50-150 order, purity is raw material at the metal powder more than 90%, add abrasive media and surface conditioning agent, carry out wet ball grinding.Its technological operation is comparatively complicated, pass through subsequent treatment such as sorting, filtration, drying, screening and redrying, and process cycle is very long.At application number is 03135633.8; name is called in the patent application of " manufacture method at a kind of scaled metal powder end " and discloses a kind of flaky metal powder manufacture method that is specially adapted to produce other anticorrosive paints such as environment-friendly and green coating Dacroment liquid, zinc-rich paint; by water-cooled temperature control, feeding inert gas shielding and adjusting grinder rotating speed; the segmentation dry ball milling is with the long-time dry problem of avoiding wet grinding to be brought.
Yet, the ball milling film-making is based on the basic principle of metal material cold deformation, along with the aggravation of deformation extent, in the process that flaky metal powder forms, crystal defect concentration raises, material generation work hardening phenomenon causes further distortion difficulty and the cracked efflorescence of powder in flakes, and it is irregular that the shape of prepared flakelike powder often is tending towards, and, because technological operation is loaded down with trivial details, process cycle is long, the material vulnerable to pollution is difficult to prepare the flakelike powder that high-purity requires.Of paramount importancely be, ball-milling method is only applicable to prepare that part hardness is low, toughness and plasticity good metal material, as metal and alloys such as Al, Cu, Zn, Pb, Ag, Au, and for some high rigidity brittle metals, alloy or intermetallic compound, and some novel amorphous and micro crystal materials, because its resistance of deformation is bigger, perhaps deformability is relatively poor, is difficult to receive Expected Results.
Summary of the invention
The object of the present invention is to provide a kind of method and apparatus that utilizes atomized drop directly to be out of shape the preparation flaky metal powder, the flaky metal powder that has obtained to have big asperratio.
Technical solution of the present invention is: with the raw metal heat fused, make its degree of superheat reach 50～300 ℃, then, be poured into the disc centre of rotation at a high speed with stable flow rate (3～30 Grams Per Second) by leting slip a remark of crucible bottom, the rotating speed of disk is 1000～50000 rev/mins.Metal bath is atomized into shape under action of centrifugal force, little drop flies out at a high speed along disk border is tangential, is shrunk to sphere under capillary effect.Be connected with refrigerating gas in the spray chamber, atomized drop carries out exchange heat in flight course and between the refrigerating gas, cools off and reach higher degree of supercooling fast.The atomized drop that is in supercooled liquid or partial coagulation attitude has good rheological behavior and thixotropic behavior, with the process of spray chamber wall high-speed impact in, strong deformation takes place, exhibition is thin in flakes, and the flaky metal powder that is obtained is for very regular discoid, its surface smoothing, have high brightness and glossiness, the purity height of powder does not exist material to pollute and problem of oxidation, and the quality of comparing powder with ball-milling method is greatly improved.
Metal of the present invention is one of metal or alloy such as Al, Cu, Pb, Zn, Ag.
Cooling medium of the present invention is N
2, inert gas such as Ar or He, pressure range is-0.1～0.1MPa.
Special equipment of the present invention comprises: melting kettle 1, rotating disk atomizer 2, drive motors 3, spray chamber 4, bearing 6, motor water cooling chamber 7 for rotating disc traditional vacuum atomizing former.Melting kettle 1 places in the closed spray chamber 4, and rotating disk atomizer 2 is positioned at the below of melting kettle 1, and spray chamber 4 bottoms are connected to powder collecting pot 5.
Atomizer rotating disk of the present invention is a taper concave surface rotating disk, and the coning angle excursion is 120 °～175 °; Atomizer disk diameter excursion is Φ 20～50mm; The atomizer rotating disk adopts BN, SiC, red copper, stainless steel or carbon fiber to make.
But the position along continuous straight runs of rotating disk atomizer of the present invention and vertical direction adjustment.
Spray chamber of the present invention is the inverted-cone shape structure, clashes into approximately perpendicular to the incident of spray chamber wall to guarantee the atomized drop of making level throw motion.Because spray chamber infinity with respect to atomized drop, therefore, the atomized drop rum point can be regarded the plane as.Spray chamber coning angle excursion is 20～90 °; The atomizing locular wall adopts double-deck water-cooling structure, and logical recirculated water cooling can obtain high degree of supercooling (10
3～10
5K/s); The spray chamber wall surface is bright and clean, and roughness is Ra0.08～0.04.
Rapid solidification shrinks behind the atomized drop collision deformation, and separates automatically with locular wall, slips into the bottom powder collecting pot at the effect lower edge locular wall of conducting oneself with dignity.Atomizer is positioned at the spray chamber middle part, and it is a concave surface tapered disk that is driven by high-speed motor, and its position is adjustable.By the horizontal direction adjustment, disc centre is overlapped with the crucible center of leting slip a remark, in atomization process, liquid stream injects disc centre, and radially drawout comes under action of centrifugal force, becomes the uniform liquid film of thickness, and is shaped in the disk border atomizing; By adjust the relative altitude of rotating disk atomizer in vertical direction, change the relative distance of rotating disk and locular wall, can regulate the space flight time of atomized drop, the exchange heat process between control atomized drop and the refrigerating gas guarantees that atomized drop is in subcooled liquid state or partial coagulation state.Before heat fused, vacuumize in the spray chamber, vacuum reaches 2～3 * 10
-2Behind the Pa, charge into N
2, inert gas such as Ar or He is as protective gas and cooling medium, pressure is-0.1～0.1MPa.
Beneficial effect of the present invention:
The present invention combines the atomizing shaping of metal bath and the distortion of atomized drop in flakes, avoided in traditional ball-milling method the first powder by atomization secondary operations problem of ball milling film-making again, technical process is greatly simplified, process cycle significantly shortens, the degree of oxidation of powder reduces, and owing to do not exist material to pollute, powder quality improves greatly.
The present invention utilizes thermal processing distortion to prepare flaky metal powder, does not have existing crystal defect of cold deformation and work hardening problem, almost is applicable to each metalloid and alloy.
This method adopts the secondary cooling, has high cooldown rate, can reach 10
3～10
5K/s belongs to the rapid condensation category, can be in order to preparation crystallite even non-crystalline material.
Description of drawings
Fig. 1 is belt transmission or gear drive between motor and the rotating disk for a kind of schematic diagram of special equipment of the present invention.Wherein, melting kettle 1, rotating disk atomizer 2, drive motors 3, spray chamber 4, powder collecting pot 5, bearing 6, motor water cooling chamber 7, let slip a remark 8.
Another implements structural representation to Fig. 2 for special equipment of the present invention, is same through-drive between motor and the atomizer.
The specific embodiment
Embodiment 1:
As shown in Figure 1, special equipment of the present invention comprises the melting kettle 1, rotating disk atomizer 2, bearing 6 and the drive motors 3 that place in the closed spray chamber 4.Wherein, rotating disk atomizer 2 is positioned at the below of melting kettle 1, for having the concave surface rotating disk of certain taper, bearing is installed on the turning cylinder of atomizer, the outside of turning cylinder is covered with water cooling chamber 7, motor places in the water cooling chamber, and spray chamber 4 bottoms are connected to powder collecting pot 5: the diameter of rotating disk atomizer is Φ 35mm, and motor is for passing through the bel-drivenn high-speed electric expreess locomotive.
Get 2 kilograms of argents, in the crucible that the band of packing into is let slip a remark.To be evacuated to 2 * 10 in the spray chamber
-2Pa charges into high-purity argon gas then, and pressure is-0.05MPa.Argent is heated to 1100 ℃, make its fusing, rotating disk atomizer is accelerated to 15000 rev/mins, the place's of leting slip a remark stopper is opened with high-speed electric expreess locomotive, liquation is by 8 outflows of leting slip a remark, flow velocity is 8 Grams Per Seconds, and melt is a fine droplet by centrifugal atomizing earlier, and reaches certain degree of supercooling by the control cooling, then, in blocks with atomizing locular wall collision deformation, the aspect ratio of sheet is 20～200, and the oxygen content of powder is 80ppm.
Embodiment 2:
As shown in Figure 2, the diameter of rotating disk atomizer is Φ 25mm, and motor is the high-speed electric expreess locomotive coaxial with atomizer.
Get 2 kilograms of argents, in the crucible that the band of packing into is let slip a remark.To be evacuated to 2 * 10 in the spray chamber
-2Pa goes into high-purity argon gas then, and pressure is-0.02MPa.Argent is heated to 1200 ℃, make its fusing, rotating disk atomizer is accelerated to 25000 rev/mins, the place's of leting slip a remark stopper is opened with high-speed electric expreess locomotive, liquation is by 8 outflows of leting slip a remark, flow velocity is 10 Grams Per Seconds, and melt is a fine droplet by centrifugal atomizing earlier, and reaches certain degree of supercooling by the control cooling, then, in blocks with atomizing locular wall collision deformation, the aspect ratio of sheet is 80～200, and the oxygen content of powder is 80ppm.
Embodiment 3:
The diameter of rotating disk atomizer is Φ 30mm, and motor is the high-speed electric expreess locomotive coaxial with atomizer.Get 2 kilograms of metallic aluminiums, in the crucible that the band of packing into is let slip a remark.To be evacuated to 3 * 10 in the spray chamber
-2Pa charges into high-purity argon gas then, and pressure is 0.05MPa.Metallic aluminium is heated to 800 ℃, make its fusing, with high-speed electric expreess locomotive rotating disk atomizer is accelerated to 45000 rev/mins, the place's of leting slip a remark stopper is opened, liquation is by 8 outflows of leting slip a remark, flow velocity is 10 Grams Per Seconds, melt is a fine droplet by centrifugal atomizing earlier, and reaches certain degree of supercooling by the control cooling, then, in blocks with atomizing locular wall collision deformation, the aspect ratio of sheet is 200-300.
Embodiment 4:
The diameter of rotating disk atomizer is Φ 30mm, and motor is the high-speed electric expreess locomotive coaxial with atomizer.Get 2 kilograms of metallic zinc, in the crucible that the band of packing into is let slip a remark.To be evacuated to 2 * 10 in the spray chamber
-2Pa charges into high-purity argon gas then, and pressure is-0.08MPa.Metallic zinc is heated to 500 ℃, make its fusing, with high-speed electric expreess locomotive rotating disk atomizer is accelerated to 50000 rev/mins, the place's of leting slip a remark stopper is opened, liquation is by 8 outflows of leting slip a remark, flow velocity is 20 Grams Per Seconds, melt is a fine droplet by centrifugal atomizing earlier, and reaches certain degree of supercooling by the control cooling, then, in blocks with atomizing locular wall collision deformation, the aspect ratio of sheet is 200～300.
Embodiment 5:
The diameter of rotating disk atomizer is Φ 40mm, and motor is the high-speed electric expreess locomotive coaxial with atomizer.Get 2 kilograms of metallic leads, in the crucible that the band of packing into is let slip a remark.To be evacuated to 2 * 10 in the spray chamber
-2Pa charges into high-purity argon gas then, and pressure is-0.04MPa.Metallic lead is heated to 450 ℃, make its fusing, rotating disk atomizer is accelerated to 35000 rev/mins, the place's of leting slip a remark stopper is opened with high-speed electric expreess locomotive, liquation is by 8 outflows of leting slip a remark, flow velocity is 15 Grams Per Seconds, and melt is a fine droplet by centrifugal atomizing earlier, and reach certain degree of supercooling by control cooling, then, in blocks with atomizing locular wall collision deformation, the aspect ratio of sheet is 100～300.
Embodiment 6:
The diameter of rotating disk atomizer is Φ 25mm, and motor is the high-speed electric expreess locomotive coaxial with atomizer.Get 2 kilograms of Cu80Zn20 alloys, in the crucible that the band of packing into is let slip a remark.To be evacuated to 2 * 10 in the spray chamber
-2Pa charges into high-purity argon gas then, and pressure is 0.05MPa.Alloy is heated to 1150 ℃, make its fusing, rotating disk atomizer is accelerated to 48000 rev/mins, the place's of leting slip a remark stopper is opened with high-speed electric expreess locomotive, liquation is by 8 outflows of leting slip a remark, flow velocity is 19 Grams Per Seconds, and melt is a fine droplet by centrifugal atomizing earlier, and reach certain degree of supercooling by control cooling, then, in blocks with atomizing locular wall collision deformation, the aspect ratio of sheet is 180～250.
Embodiment 7:
The diameter of rotating disk atomizer is Φ 25mm, and motor is the high-speed electric expreess locomotive coaxial with atomizer.Get 2 kilograms of Zr55Al10Ni5Cu30 non-crystaline amorphous metals, in the crucible that the band of packing into is let slip a remark.To be evacuated to 2 * 10 in the spray chamber
-2Pa charges into high-purity argon gas then, and pressure is 0.1MPa.Alloy is heated to 1200 ℃, makes its fusing, rotating disk atomizer is accelerated to 38000 rev/mins with high-speed electric expreess locomotive, the place's of leting slip a remark stopper is opened, liquation is by 8 outflows of leting slip a remark, and flow velocity is 28 Grams Per Seconds, and melt is a fine droplet by centrifugal atomizing earlier, and reach certain degree of supercooling by control cooling, then, in blocks with atomizing locular wall collision deformation, the aspect ratio of sheet is 120～200, and the oxygen content of powder is 80ppm.
Embodiment 8:
The diameter of rotating disk atomizer is Φ 50mm, and motor is the high-speed electric expreess locomotive coaxial with atomizer.Get 2 kilograms of HoCu2 alloys, in the crucible that the band of packing into is let slip a remark.To be evacuated to 2 * 10 in the spray chamber
-2Pa charges into high-purity argon gas then, and pressure is-0.02MPa.Alloy is heated to 1200 ℃, makes its fusing, rotating disk atomizer is accelerated to 8000 rev/mins with high-speed electric expreess locomotive, the place's of leting slip a remark stopper is opened, liquation is by 8 outflows of leting slip a remark, and flow velocity is 12 Grams Per Seconds, and melt is a fine droplet by centrifugal atomizing earlier, and reach certain degree of supercooling by control cooling, then, in blocks with atomizing locular wall collision deformation, the aspect ratio of sheet is 120～250, and the oxygen content of powder is 80ppm.
Claims (7)
1. the preparation method of a flaky metal powder, it is characterized in that: with the raw metal heat fused, make its degree of superheat reach 50～300 ℃, then, be poured into the disc centre of rotation at a high speed with stable flow rate 3～30 Grams Per Seconds by leting slip a remark of crucible bottom, the rotating speed of disk is 1000～50000 rev/mins, is atomized into shape under action of centrifugal force, fine droplet flies out at a high speed along disk border is tangential, is shrunk to sphere under capillary effect; Be connected with refrigerating gas in the spray chamber, atomized drop carries out exchange heat in flight course and between the refrigerating gas, cools off and reach higher degree of supercooling fast; The atomized drop that is in supercooled liquid or partial coagulation attitude has good rheological behavior and thixotropic behavior, with the process of spray chamber wall high-speed impact in, strong deformation takes place, exhibition is in flakes thin, the flaky metal powder that is obtained is regular discoid.
2, in accordance with the method for claim 1, it is characterized in that: described metal is one of metal or alloy such as Al, Cu, Pb, Zn, Ag.
3, according to claim 1 or 2 described methods, it is characterized in that: cooling medium of the present invention is N
2, Ar or He inert gas, pressure range is-0.1～0.1MPa.
4, a kind of equipment of implementing the described method of claim 1, it is characterized in that: this equipment comprises: melting kettle (1), rotating disk atomizer (2), drive motors (3), spray chamber (4), bearing (6), water cooling chamber (7); Melting kettle (1) places in the closed spray chamber (4), and rotating disk atomizer (2) is positioned at the below of melting kettle (1), and spray chamber (4) bottom is connected to powder collecting pot (5).
5, according to the described equipment of claim 4, it is characterized in that: described atomizer rotating disk is a taper concave surface rotating disk, and the coning angle excursion is 120 °～175 °; Atomizer disk diameter excursion is Φ 20-50mm; The atomizer rotating disk adopts BN, SiC, red copper, stainless steel or carbon fiber to make.
6, according to claim 4 or 5 described equipment, it is characterized in that: but the dish atomizer position along continuous straight runs or the vertical direction adjustment of described commentaries on classics.
7, according to the described equipment of claim 4, it is characterized in that: described spray chamber is the inverted-cone shape structure, and the coning angle excursion is 20～90 °; The atomizing locular wall adopts double-deck water-cooling structure, logical recirculated water cooling; Spray chamber wall surface roughness is Ra0.08～0.04.
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100488671C (en) * | 2007-02-09 | 2009-05-20 | 北京蓝景创新科技有限公司 | Apparatus for preparing metal powder |
| CN101430292B (en) * | 2008-12-04 | 2011-05-04 | 上海大学 | Method for single metal droplet supercooling degree measurement by large cooling speed in situ fast thermal analysis |
| CN102248170A (en) * | 2011-07-10 | 2011-11-23 | 云南锡业集团（控股）有限责任公司 | Production method of middle and low temperature non-ferrous metal sheet |
| CN102400082A (en) * | 2011-11-15 | 2012-04-04 | 燕山大学 | Magnesium alloy surface conduction anticorrosive paint and preparation method thereof |
| CN102974834A (en) * | 2012-11-30 | 2013-03-20 | 东莞市新科炬机械制造有限公司 | Device for preparing ultrafine solder powder |
| CN103691897A (en) * | 2013-12-09 | 2014-04-02 | 北京工业大学 | Method for preparing amorphous thin belt by utilizing rapid quenching of concave-surface rotating-disc type single roll |
| CN104475746A (en) * | 2014-11-25 | 2015-04-01 | 张建利 | Rotation centrifugation atomization technology and device for manufacturing small beryllium balls and small beryllium alloy balls |
| CN104972133A (en) * | 2015-07-18 | 2015-10-14 | 山东理工大学 | Method for preparing Cu-based SiC composite micro powder for electrode of electric spark tool |
| CN105728739A (en) * | 2016-03-21 | 2016-07-06 | 孙颖 | Mechanical centrifugal atomization device convenient to regulate |
| CN105798314A (en) * | 2016-03-21 | 2016-07-27 | 江苏志远节能炉业设备有限公司 | Mechanical centrifugal atomization device used for efficient metallurgy |
| CN107127350A (en) * | 2017-05-19 | 2017-09-05 | 湖南久泰冶金科技有限公司 | A kind of metal centrifugal atomizing powder high-speed centrifugal atomization device |
| CN107775009A (en) * | 2017-12-14 | 2018-03-09 | 淮北五星铝业有限公司 | A kind of preparation method of flake aluminum |
| CN107838430A (en) * | 2017-12-14 | 2018-03-27 | 刘钦东 | A kind of processing unit (plant) of flake aluminum |
| CN109175392A (en) * | 2018-09-25 | 2019-01-11 | 大连理工大学 | One kind is by drop centrifugal atomization Special turntable structure |
| CN111270083A (en) * | 2020-03-20 | 2020-06-12 | 湖南达诺智能机器人科技有限公司 | A automatic film-making equipment for gold purification |
| CN112045197A (en) * | 2020-09-15 | 2020-12-08 | 湖南天际智慧材料科技有限公司 | Rotating disc granulation equipment and production process thereof |
| CN114131031A (en) * | 2021-10-21 | 2022-03-04 | 深圳市万泽航空科技有限责任公司 | Middle leaky ladle system with spray disc protection function and installation method |
-
2005
- 2005-04-25 CN CN 200510011622 patent/CN1676249A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100488671C (en) * | 2007-02-09 | 2009-05-20 | 北京蓝景创新科技有限公司 | Apparatus for preparing metal powder |
| CN101430292B (en) * | 2008-12-04 | 2011-05-04 | 上海大学 | Method for single metal droplet supercooling degree measurement by large cooling speed in situ fast thermal analysis |
| CN102248170A (en) * | 2011-07-10 | 2011-11-23 | 云南锡业集团（控股）有限责任公司 | Production method of middle and low temperature non-ferrous metal sheet |
| CN102400082A (en) * | 2011-11-15 | 2012-04-04 | 燕山大学 | Magnesium alloy surface conduction anticorrosive paint and preparation method thereof |
| CN102974834A (en) * | 2012-11-30 | 2013-03-20 | 东莞市新科炬机械制造有限公司 | Device for preparing ultrafine solder powder |
| CN103691897A (en) * | 2013-12-09 | 2014-04-02 | 北京工业大学 | Method for preparing amorphous thin belt by utilizing rapid quenching of concave-surface rotating-disc type single roll |
| CN104475746A (en) * | 2014-11-25 | 2015-04-01 | 张建利 | Rotation centrifugation atomization technology and device for manufacturing small beryllium balls and small beryllium alloy balls |
| CN104972133B (en) * | 2015-07-18 | 2017-01-25 | 山东理工大学 | Method for preparing Cu-based SiC composite micro powder for electrode of electric spark tool |
| CN104972133A (en) * | 2015-07-18 | 2015-10-14 | 山东理工大学 | Method for preparing Cu-based SiC composite micro powder for electrode of electric spark tool |
| CN105728739A (en) * | 2016-03-21 | 2016-07-06 | 孙颖 | Mechanical centrifugal atomization device convenient to regulate |
| CN105798314A (en) * | 2016-03-21 | 2016-07-27 | 江苏志远节能炉业设备有限公司 | Mechanical centrifugal atomization device used for efficient metallurgy |
| CN105798314B (en) * | 2016-03-21 | 2018-03-23 | 孙荣华 | High-efficient metallurgical mechanical centrifugal atomising device |
| CN107127350A (en) * | 2017-05-19 | 2017-09-05 | 湖南久泰冶金科技有限公司 | A kind of metal centrifugal atomizing powder high-speed centrifugal atomization device |
| CN107127350B (en) * | 2017-05-19 | 2023-12-12 | 湖南久泰冶金科技有限公司 | High-speed centrifugal atomizing device for metal centrifugal atomizing powder preparation |
| CN107775009A (en) * | 2017-12-14 | 2018-03-09 | 淮北五星铝业有限公司 | A kind of preparation method of flake aluminum |
| CN107838430A (en) * | 2017-12-14 | 2018-03-27 | 刘钦东 | A kind of processing unit (plant) of flake aluminum |
| CN109175392A (en) * | 2018-09-25 | 2019-01-11 | 大连理工大学 | One kind is by drop centrifugal atomization Special turntable structure |
| CN111270083A (en) * | 2020-03-20 | 2020-06-12 | 湖南达诺智能机器人科技有限公司 | A automatic film-making equipment for gold purification |
| CN112045197A (en) * | 2020-09-15 | 2020-12-08 | 湖南天际智慧材料科技有限公司 | Rotating disc granulation equipment and production process thereof |
| CN114131031A (en) * | 2021-10-21 | 2022-03-04 | 深圳市万泽航空科技有限责任公司 | Middle leaky ladle system with spray disc protection function and installation method |
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