CN113230679B - Centrifugal electronic ceramic spray granulating and drying device - Google Patents
Centrifugal electronic ceramic spray granulating and drying device Download PDFInfo
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- CN113230679B CN113230679B CN202110456552.3A CN202110456552A CN113230679B CN 113230679 B CN113230679 B CN 113230679B CN 202110456552 A CN202110456552 A CN 202110456552A CN 113230679 B CN113230679 B CN 113230679B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/20—Sprayers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/086—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by the winding course of the gas stream
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Abstract
The invention discloses a centrifugal electronic ceramic spray granulation drying device, which comprises a box body, a forming cylinder, a hot air disc, a flow dividing body and a spray disc, wherein the forming cylinder, the hot air disc, the flow dividing body and the spray disc are positioned in the box body, the hot air disc is arranged above the forming cylinder, the spray disc corresponding to the hot air disc is arranged at the bottom end in the forming cylinder, the flow dividing body is positioned between the spray disc and the hot air disc, an isolating blade, a flow guide plate and a power pipe are arranged between the box body and the forming cylinder, and the power pipe is positioned between the flow guide plates.
Description
Technical Field
The invention relates to the technical field of electronic ceramic processing equipment, in particular to a centrifugal electronic ceramic spray granulation drying device.
Background
The electronic ceramics are ceramics that can utilize electric and magnetic properties in the electronics industry. The electronic ceramic is a ceramic with new functions finally obtained through the precise control of the surface, grain boundary and size structure. Can be widely applied to the aspects of energy sources, household appliances, automobiles and the like. The preparation process of the electronic ceramic comprises basic unit operations of raw material treatment and processing, ball milling, granulation, molding, sintering, surface processing and the like.
Spray granulation is a process of fluidizing a material to be dried by mechanical action, dispersing the material into fine particles like mist, and removing most of water at the moment of contact of the particles with hot air to dry the solid matter in the material into spherical particles with regular shapes. The powder prepared by spray granulation has the characteristics of uniform particles, uniform water content, good fluidity and the like, and provides important guarantee for pressing compact and uniform electronic ceramic blanks.
In a general spray dryer, the contact mode of mist droplets and hot air is divided into a parallel flow mode, a counter flow mode and a mixed flow mode, wherein mixed flow type droplets move upwards in a counter flow mode and then move downwards in a parallel flow mode, and since the counter flow and the parallel flow are in a tower, dried ceramic powder particles can not timely leave the hot air and are overheated in the parallel flow process, so that the ceramic powder cracks due to overheating.
Disclosure of Invention
The invention aims to solve the problem that ceramic powder particles in a mixed flow type spray dryer in the prior art are poor in overheating quality, and provides a centrifugal electronic ceramic spray granulation drying device.
In order to achieve the purpose, the invention adopts the following technical scheme:
centrifugal electron pottery spray granulation drying device, including the box, the inside of box sets up a shaping section of thick bamboo, hot-blast dish, reposition of redundant personnel and spraying dish, the inner space of a shaping section of thick bamboo is the shaping chamber, the space between the inside of a shaping section of thick bamboo and box is the drying chamber.
Specifically, a hot air plate is arranged above the forming barrel and used for feeding hot air into the box body, a spraying plate corresponding to the position of the hot air plate is arranged at the bottom end of the forming barrel, and atomized ceramic slurry can be fed into the box body through the spraying plate.
Furthermore, a shunting body is arranged at the top end of the inner part of the forming cylinder, the shunting body is positioned between the spraying disc and the hot air disc, the edge of the spraying disc is annularly distributed on the nozzle, and the air outlet on the lower surface of the hot air disc is annularly distributed on the edge of the hot air disc. The ceramic slurry liquid drops sprayed by the nozzles and hot air brought by the hot air disk can be in contact between the shunting body and the inner wall of the forming cylinder, and the ceramic slurry liquid drops are dehydrated and dried by the hot air to form ceramic powder particles.
Furthermore, the flow dividing body is a cylinder with a cone part at the upper end and a cylinder part at the middle part. The cone at the upper end of the flow dividing body is used for guiding hot air, and the hot air is facilitated to form divergent flow.
Furthermore, the plane of the upper end face of the forming cylinder penetrates through the cylindrical part of the flow distribution body, hot air is in contact with ceramic slurry droplets outside the cylindrical part of the flow distribution body, the ceramic slurry droplets are dried to become ceramic powder particles, the mass of the ceramic powder particles becomes light, the air outlet of the hot air disc faces outwards, and the hot air can bring the ceramic powder particles into the drying cavity.
Simultaneously, divide fluidic inside to set up cavity and the annular water conservancy diversion passageway of up-tilting, divide fluidic cavity inside to set up interior flabellum, the inside promotion fan that sets up of water conservancy diversion passageway, interior flabellum passes through power shaft coaxial coupling with the promotion fan, the cavity upper end communicates with the air-supply line of hot-blast dish. The hot air in the hot air plate blows into the cavity to rotate the inner fan blade, the fan is pushed to rotate along with the inner fan blade, the fan is pushed to rotate in the flow guide channel to generate wind power, and the ceramic powder particles outside the cylindrical part of the flow distribution body can be blown outwards in an auxiliary mode to enable the ceramic powder particles to enter the drying cavity.
Further, the lower end of the cavity is communicated with the flow guide channel through the vent hole and used for air outlet of the cavity.
Furthermore, a drying cavity between the box body and the forming cylinder is internally provided with an isolation blade, a guide plate and a power pipe. The isolating blade gradually extends from top to bottom towards the forming cylinder from the inner wall of the box body, an inclined plane is formed on one side, close to the forming cylinder, of the isolating blade, and a whole spiral guide plate and a partial spiral power pipe are arranged on one side, close to the forming cylinder, of the isolating blade. The guide plate is spirally downward inclined and used for guiding hot air to form a downward rotational flow along the isolating blade. Ceramic powder particles in the hot air enter the powder channel between the isolation blades under the action of centrifugal force. Because the inclined plane is formed on one side of the isolation blade close to the forming cylinder, the space at the bottom of the drying cavity is reduced, and the hot air rotational flow flows towards the direction close to the forming cylinder at the bottom of the drying cavity.
Preferably, the air outlet of the hot air plate is inclined to the spiral direction of the flow guide plate, so as to facilitate the formation of hot air rotational flow.
Furthermore, an air inlet concave ring is arranged below the forming cylinder, and a collecting pipe communicated with the air inlet end of the power pipe is arranged in the middle of the air inlet concave ring. The hot-blast whirl can get into the concave ring that admits air in the bottom in dry chamber, gets into the power pipe from the concave ring that admits air again, the direction of giving vent to anger of power pipe is tangent with the spiral that the power pipe corresponds, the power pipe is in between the guide plate, and the hot-blast formation whirl that is used for promoting between the guide plate of going out from the power pipe.
Furthermore, a drying box is arranged below the air inlet concave ring, and hot air rotational flow at the bottom of the drying cavity can also enter the drying box. Set up out the powder passageway between the inside of dry box and box, go out the upper end of powder passageway with keep apart the powder way intercommunication between the blade, the lower extreme that goes out the powder passageway sets up out the powder mouth, and ceramic powder granule accessible in the powder way goes out from going out the powder mouth, when going out the powder passageway, can be by drying once more for further take away steam.
The bottom of the drying box is provided with an air outlet pipe, and hot air in the drying box is discharged from the drying box after being purified.
When the ceramic slurry liquid drops contact with hot air, part of the ceramic slurry liquid drops are too large in size, target powder particles are not formed, and the ceramic slurry liquid drops directly drop back. The inside of spraying dish sets up and holds the box, hold the inside intercommunication of the upper end and the shaping section of thick bamboo of box, hold the box and be used for accepting ceramic slurry and the large granule powder granule that do not form the powder granule. The bottom of the receiving box is provided with a discharge pipe, ceramic slurry in the receiving box is discharged from the discharge pipe, and the ceramic slurry is atomized after being processed and reformed.
The invention has the beneficial effects that:
1. after ceramic slurry liquid drops in the centrifugal electronic ceramic spray granulation drying device contact with hot air to form ceramic powder particles, the ceramic powder particles are brought into the drying cavity by two strands of hot air, so that the ceramic powder particles can be prevented from being overheated and cracked in the hot air, and the quality of the ceramic powder particles is effectively maintained;
2. the centrifugal electronic ceramic spray granulation drying device utilizes the hot air direction and the guide plate to form hot air rotational flow in the drying cavity, completes the screening of ceramic powder particles, and simultaneously utilizes the hot air flow to form hot air rotational flow auxiliary force through the inclination of the isolation blades and the power pipe, thereby realizing the energy recycling.
3. This centrifugal electron ceramic spray granulation drying device can accomplish the separation of large granule ceramic powder granule at the inside shaping chamber of a shaping section of thick bamboo, accomplishes the separation of tiny particle ceramic powder granule at dry chamber, makes target ceramic powder granule go out from the powder way, accomplishes ceramic powder's preferred process, further improves powder particles's homogeneity, provides high-quality ceramic powder for electron ceramic production.
In conclusion, the centrifugal electronic ceramic spray granulation drying device can not only spray granulation of electronic ceramic slurry to obtain high-quality ceramic powder particles, but also complete optimization of ceramic powder, provide high-quality ceramic powder for electronic ceramic production, has compact structure in the whole granulation device, can realize energy utilization, and has great application value.
Drawings
FIG. 1 is a schematic structural diagram of the electronic ceramic spray granulation drying device;
FIG. 2 is a schematic top view of the apparatus for spray granulation and drying of electronic ceramics;
FIG. 3 is a schematic structural view of a hot air plate of the electronic ceramic spray granulation drying device;
FIG. 4 is a schematic structural view of the upper surface of the spray disk of the electronic ceramic spray granulation drying apparatus;
FIG. 5 is a schematic view of the inner structure of the spray disk of the electronic ceramic spray granulation drying device;
fig. 6 is a schematic structural view of the split fluid of the electronic ceramic spray granulation drying device.
In the figure: 1. a box body; 2. a forming cylinder; 3. a hot air plate; 4. a flow divider; 5. a spray tray; 6. a nozzle; 7. isolating the blade; 8. a baffle; 9. a concave air inlet ring; 10. drying the box; 11. a power tube; 12. a thrust fan; 13. a powder outlet channel; 14. a powder outlet; 15. an air outlet pipe; 16. a collection pipe; 21. a drying chamber; 22. selecting a cavity; 31. an air outlet; 41. inner fan blades 42, a power shaft; 43. a vent pipe; 44. a flow guide channel; 51. a receiving box; 71. and (6) powder passage.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, the centrifugal electronic ceramic spray granulation drying device comprises a box body 1, wherein a forming cylinder 2, a hot air disc 3, a flow distribution body 4 and a spray disc 5 are arranged inside the box body 1, the inner space of the forming cylinder 2 is a forming cavity 21, and the space between the forming cylinder 2 and the inside of the box body 1 is a drying cavity 22.
Specifically, a hot air plate 3 is arranged above the forming barrel 2, the hot air plate 3 is used for feeding hot air into the box body 1, the spraying plate 5 corresponding to the hot air plate 3 is arranged at the bottom end of the forming barrel 2, and the spraying plate 5 can feed atomized ceramic slurry into the box body 1.
Further, a flow distribution body 4 is arranged at the top end inside the forming cylinder 2, the flow distribution body 4 is located between the spraying disc 5 and the hot air disc 3, the edge of the spraying disc 5 is annularly distributed on the nozzle 6, and referring to fig. 3, the air outlet 31 on the lower surface of the hot air disc 3 is annularly distributed on the edge of the hot air disc 3. The ceramic slurry liquid drops sprayed by the nozzles 6 can contact with hot air brought by the hot air plate 3 between the shunting body 4 and the inner wall of the forming cylinder 2, and the ceramic slurry liquid drops are dehydrated and dried by the hot air to form ceramic powder particles.
Further, the flow dividing body 4 is a cylinder with a cone part at the upper end and a cylinder part at the middle part. The cone at the upper end of the flow dividing body 4 is used for guiding hot air, and the hot air is facilitated to form divergent flow.
Further, the plane of the upper end face of the forming cylinder 2 penetrates through the cylindrical part of the flow distribution body 4, hot air is in contact with ceramic slurry droplets outside the cylindrical part of the flow distribution body 4, the ceramic slurry droplets become lighter after being dried into ceramic powder particles, the air outlet 31 of the hot air disc 3 faces outwards, and the hot air can bring the ceramic powder particles into the drying cavity 22.
Referring to fig. 6, a cavity and an upward inclined annular flow guide channel 44 are arranged inside the flow divider 4, an inner fan blade 41 is arranged inside the cavity of the flow divider 4, a pushing fan 12 is arranged inside the flow guide channel 44, the inner fan blade 41 and the pushing fan 12 are coaxially connected through a power shaft 42, and the upper end of the cavity is communicated with an air inlet pipe of the hot air tray 3. The hot air in the hot air plate 3 blows into the cavity to rotate the inner fan blade 41, the fan 12 is pushed to rotate along with the inner fan blade 41, the fan 12 is pushed to rotate in the flow guide channel 44 to generate wind force, and the ceramic powder particles outside the cylindrical part of the flow distribution body 4 can be blown outwards in an auxiliary mode, so that the ceramic powder particles enter the drying cavity 22.
Further, the lower end of the cavity is communicated with the flow guide channel 44 through the vent hole 43 for air outlet of the cavity.
Further, a drying cavity 22 between the box body 1 and the forming cylinder 2 is internally provided with an isolating blade 7, a guide plate 8 and a power pipe 11. The isolating blade 7 gradually extends from top to bottom towards the forming cylinder 2 from the inner wall of the box body 1, an inclined surface is formed on one side, close to the forming cylinder 2, of the isolating blade 7, and a whole spiral guide plate 8 and a partial spiral power pipe 11 are arranged on one side, close to the forming cylinder 2, of the isolating blade 7. The guide plate 8 is spirally inclined downwards, and the guide plate 8 is used for guiding hot air to form a downward rotational flow along the isolating blade 7. Ceramic powder particles in the hot air enter the powder passage 71 between the separation blades 7 under the action of centrifugal force. Because the inclined surface is formed on one side of the isolating blade 7 close to the forming cylinder 2, the space at the bottom of the drying cavity 22 becomes smaller, and the hot air rotational flow flows towards the direction close to the forming cylinder 2 at the bottom of the drying cavity 22.
In this embodiment, the outlet 31 of the hot air plate 3 is also inclined in the spiral direction of the guide plate 8, which contributes to the formation of the hot air swirling flow.
Further, an air inlet concave ring 9 is arranged below the forming tube 2, and a collecting tube 16 communicated with the air inlet end of the power tube 11 is arranged in the middle of the air inlet concave ring 9. Hot-blast whirl can get into the concave ring 9 that admits air at the bottom of drying chamber 22, gets into power pipe 11 from the concave ring 9 that admits air again, the direction of giving vent to anger of power pipe 11 is tangent with the spiral that power pipe 11 corresponds, power pipe 11 is in between guide plate 8, and the hot-blast formation whirl that is used for promoting between the guide plate 8 of going out from power pipe 11.
Further, a drying box 10 is arranged below the air inlet concave ring 9, and hot air rotational flow at the bottom of the drying cavity 22 also enters the drying box 10. Set up out powder passageway 13 between the inside of dry box 10 and box 1, go out the upper end of powder passageway 13 with powder way 71 intercommunication between the isolation blade 7, the lower extreme that goes out powder passageway 13 sets up out powder mouth 14, and the ceramic powder granule accessible in powder way 71 goes out from powder mouth 14 out through going out powder passageway 13, when going out powder passageway 13, can be dried once more for further take away steam.
The bottom of the drying box 10 is provided with an air outlet pipe 15, and hot air in the drying box 10 is discharged from the drying box 10 and is discharged after being purified.
When the ceramic slurry liquid drops contact with hot air, part of the ceramic slurry liquid drops are too large in size, target powder particles are not formed, and the ceramic slurry liquid drops directly drop back. The spraying disc 5 is internally provided with a receiving box 51, the upper end of the receiving box 51 is communicated with the inside of the forming cylinder 2, and the receiving box 51 is used for receiving ceramic slurry and large-particle powder particles which are not formed into powder particles. The bottom of the receiving box 51 is provided with a discharge pipe, and the ceramic slurry in the receiving box 51 is discharged from the discharge pipe, and is atomized after being processed and reformed.
The working process of the centrifugal electronic ceramic spray granulation drying device is as follows:
ceramic slurry is atomized by the spray 5 and enters the forming cavity 22, meanwhile, hot air is fed into the box body 1 by the hot air disc 3, the conical part at the upper end of the flow distribution body 4 enables the hot air to form divergent flow, ceramic slurry liquid drops sprayed by the nozzle 6 are contacted with the hot air brought by the hot air disc 3 in a space between the cylindrical part of the flow distribution body 4 and the inner wall of the forming cylinder 2, the ceramic slurry liquid drops are dehydrated and dried by the hot air to form ceramic powder particles, and large-particle ceramic powder particles and ceramic slurry liquid which is not dried drop into the receiving box 51;
the dry quality that becomes behind the ceramic slurry liquid drop is lighter, the air outlet 31 direction of hot-blast dish 3 is outside, and hot-blast can bring the ceramic powder granule into dry chamber 22, and simultaneously, hot-blast among the hot-blast dish 3 blows in and can make interior flabellum 41 rotatory in the cavity, and it is rotatory to promote flabellum 41 in the promotion fan 12 follows, and promotion fan 12 is rotatory in water conservancy diversion passageway 44 and is produced the wind power, can assist and blow the outside ceramic powder granule of cylinder portion of reposition of redundant personnel 4 outward, impels the ceramic powder granule to get into dry chamber 22. The guide plate 8 is spirally inclined downwards, so that hot air forms a downward rotational flow along the isolation blades 7, ceramic powder particles in the hot air enter the powder channel 71 between the isolation blades 7 under the action of centrifugal force, the ceramic powder particles in the powder channel 71 can pass through the powder outlet channel 13 and go out from the powder outlet 14, and when passing through the powder outlet channel 13, the ceramic powder particles can be dried again and are used for evaporating water vapor;
because the side, close to the forming barrel 2, of the isolating blade 7 is an inclined surface, the bottom space of the drying cavity 22 is reduced, hot air rotational flow can flow towards the direction close to the forming barrel 2 at the bottom of the drying cavity 22, the hot air rotational flow can enter the air inlet concave ring 9 at the bottom of the drying cavity 22 and then enter the power pipe 11 from the air inlet concave ring 9, the air outlet direction of the power pipe 11 is tangent to the spiral corresponding to the power pipe 11, the power pipe 11 is located between the guide plates 8, and the hot air discharged from the power pipe 11 is used for promoting the hot air between the guide plates 8 to form rotational flow;
the hot air whirls at the bottom of the drying chamber 22 also enters the drying box 10 for re-drying of the powder particles, and the hot air in the drying box 10 is discharged after being purified from the drying box 10.
The centrifugal electronic ceramic spray granulation drying device in the embodiment can not only spray granulation of electronic ceramic slurry to obtain high-quality ceramic powder particles, but also complete optimization of ceramic powder, provide high-quality ceramic powder for electronic ceramic production, has a compact structure in the whole granulation device, can realize energy utilization, and has application value.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The centrifugal electronic ceramic spray granulation drying device is characterized by comprising a box body (1), a forming cylinder (2), a hot air disc (3), a flow distribution body (4) and a spray disc (5), wherein the forming cylinder (2), the hot air disc (3), the flow distribution body (4) and the spray disc (5) are positioned in the box body (1), the hot air disc (3) is arranged above the forming cylinder (2), the spray disc (5) corresponding to the hot air disc (3) is arranged at the bottom end in the forming cylinder (2), the flow distribution body (4) is arranged at the top end in the forming cylinder (2), and the flow distribution body (4) is positioned between the spray disc (5) and the hot air disc (3);
the flow dividing body (4) is a cylinder with a cone part at the upper end and a cylindrical part at the middle part, the plane of the upper end surface of the forming cylinder (2) penetrates through the cylindrical part of the flow dividing body (4), and the air outlet (31) of the hot air disc (3) is outward in direction and inclined to the spiral direction of the flow guide plate (8);
a cavity and an annular flow guide channel (44) inclined upwards are arranged in the flow divider (4), an inner fan blade (41) is arranged in the cavity of the flow divider (4), a pushing fan (12) is arranged in the flow guide channel (44), the inner fan blade (41) and the pushing fan (12) are coaxially connected through a power shaft (42), the upper end of the cavity is communicated with an air inlet pipe of the hot air disc (3), and the lower end of the cavity is communicated with the flow guide channel (44) through a vent hole (43);
an isolation blade (7), a guide plate (8) and a power pipe (11) are arranged between the box body (1) and the forming cylinder (2), the isolation blade (7) gradually extends from top to bottom towards the forming cylinder (2) from the inner wall of the box body (1), the isolation blade (7) is provided with a whole spiral guide plate (8) and a partial spiral power pipe (11) close to one side of the forming cylinder (2), and the power pipe (11) is arranged between the guide plates (8);
an air inlet concave ring (9) is arranged below the forming tube (2), and a collecting tube (16) communicated with the air inlet end of the power tube (11) is arranged in the middle of the air inlet concave ring (9).
2. The centrifugal electronic ceramic spray granulation drying device according to claim 1, wherein the edge of the spray disk (5) is arranged around the nozzle (6), and the air outlet (31) on the lower surface of the hot air disk (3) is arranged around the edge of the hot air disk (3).
3. The centrifugal electronic ceramic spray granulation drying device according to claim 1, wherein the guide plate (8) and the power pipe (11) are spirally inclined downwards, and the air outlet direction of the power pipe (11) is tangential to the corresponding spiral of the power pipe (11).
4. The centrifugal electronic ceramic spray granulation drying device according to claim 1, wherein a drying box (10) is arranged below the air inlet concave ring (9), a powder outlet channel (13) is arranged between the drying box (10) and the interior of the box body (1), the upper end of the powder outlet channel (13) is communicated with a powder channel (71) between the isolation blades (7), and the lower end of the powder outlet channel (13) is provided with a powder outlet (14).
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| CN114791208B (en) * | 2022-04-15 | 2023-01-20 | 临沂金成电子有限公司 | Spray dryer for producing environment-friendly microwave electronic ceramic material and operation method |
| CN115235229B (en) * | 2022-07-25 | 2023-08-01 | 安徽环态生物能源科技开发有限公司 | Ventilating mechanism for particle forming machine |
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| CN109985409A (en) * | 2018-01-02 | 2019-07-09 | 泉州市绿色低碳研究院 | A kind of spray dryer |
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Denomination of invention: Centrifugal electronic ceramic spray granulation drying device Effective date of registration: 20220822 Granted publication date: 20220201 Pledgee: Postal Savings Bank of China Limited Loudi branch Pledgor: HUNAN MEICHENG CERAMIC TECHNOLOGY Co.,Ltd. Registration number: Y2022980013142 |
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