CN104875470B - Air distribution system for manufacturing engine heat insulation layer and control method of air distribution system - Google Patents
Air distribution system for manufacturing engine heat insulation layer and control method of air distribution system Download PDFInfo
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- CN104875470B CN104875470B CN201510246473.4A CN201510246473A CN104875470B CN 104875470 B CN104875470 B CN 104875470B CN 201510246473 A CN201510246473 A CN 201510246473A CN 104875470 B CN104875470 B CN 104875470B
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- changeover valve
- valve
- pneumatic bag
- rubber pneumatic
- switching valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
- B32B37/1018—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure using only vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B41/00—Arrangements for controlling or monitoring lamination processes; Safety arrangements
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an air distribution system for manufacturing an engine heat insulation layer and a control method of the air distribution system, and belongs to the technical field of the manufacturing of solid rocket engine heat insulation layers. The air distribution system comprises a first switching valve, a second switching valve, a third switching valve and a fourth switching valve which are sequentially connected by a pipeline, wherein the fourth switching valve is connected with the first switching valve to form a circulation channel; the first switching valve is also connected with a vacuum pump and a vacuum cabin; the second switching valve is connected with a rubber air bag; the third switching valve is also provided with an evacuation pipeline; the fourth switching valve is also connected with an air compressor. The system provided by the invention can eliminate influences of gas generated by pre-stage operation, residual solvents and the like via vacuumization; under the vacuum state, the air bag is pressed to patch so as to prevent gases generated by operation from being brought in; the normal pressure is combined with the air compressor, so that the patching pressure of the rubber air bag is enhanced further, and the pasting effect can be enhanced; the bonding quality and the appearance quality of a mold surface are enhanced obviously.
Description
Technical field
The invention belongs to solid propellant rocket heat insulation layer manufacturing technology field is and in particular to a kind of be used for electromotor thermal insulation
Air distribution system and its control method that layer manufactures.
Background technology
Solid propellant rocket heat insulation layer adopts rubber pneumatic bag adhesive pattern at present, will be wrapped in rubber by heat insulation layer raw cook
Balloon surface, inserts housing relevant position together with rubber pneumatic bag, to rubber pneumatic bag inflating pressure, thus completing paster.In patch
Find in piece, due to the impact of the produced gas such as operation and residual solvent, easily produce unsticking, lead to interfacial failure；With
When, also with variable condition free at the change of atmospheric pressure, heat insulation layer raw cook produces rubber pneumatic bag form with the change of its form
The movement of radial direction, there is axial displacement to some extent in the heat insulation layer raw cook near end socket, cause distortion and fold, type
Face quality problems.
Content of the invention
The present invention provides a kind of air distribution system for the manufacture of electromotor heat insulation layer and its control method, reaches raising
The purpose of heat insulation layer paster quality.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of electromotor heat insulation layer that is used for manufactures
Air distribution system, including passing sequentially through the first changeover valve of pipeline connection, the second changeover valve, the 3rd changeover valve and the 4th turn
Connect valve, the 4th changeover valve and the first changeover valve connect and compose circulation canal, the wherein first changeover valve is also associated with vacuum pump and true
Empty cabin, the second changeover valve is connected with rubber pneumatic bag, and the 3rd changeover valve is additionally provided with emptying pipeline, and the 4th changeover valve is also associated with pneumatics
Machine.
Between the first described changeover valve and the second changeover valve, pressure gauge is installed.
Between described second changeover valve and the 3rd changeover valve, flow monitoring instrument is installed.
First proportional valve is installed, on the emptying pipeline of the 3rd changeover valve between described 3rd changeover valve and the 4th changeover valve
It is provided with the second proportional valve.
Described first proportional valve and the second proportional valve adopt numerical control pattern.
The control method of said system, concretely comprises the following steps:
1) adiabatic layer material is placed in the inside of motor body, and rubber pneumatic bag is placed in adiabatic layer material, then
Electromotor is placed in vacuum chamber, opens vacuum pump, the first changeover valve and the second changeover valve, close other valves；To vacuum chamber
And rubber pneumatic bag is evacuated to -0.096mpa, then maintain this vacuum 1-3h；
2) close the first changeover valve, open the second changeover valve, the 3rd changeover valve, make in rubber pneumatic bag air inlet to normal pressure；
3) open the second changeover valve, the 3rd changeover valve, the 4th changeover valve and air compressor machine, setting is inflated to rubber pneumatic bag
Require, and pressurize 1h；
4) close vacuum pump, air compressor machine, open the first changeover valve, the second changeover valve and the 3rd changeover valve, make vacuum chamber and
The internal pressure of rubber pneumatic bag is changed into normal pressure, takes out electromotor；
The preparation of electromotor heat insulation layer can be realized by the operation of above-mentioned steps to put in place；Complete heat insulation layer in-engine
The controlled stickup of vacuum.
Further, described step 2) in, during to air inlet in rubber pneumatic bag to normal pressure, air inlet is controlled by the second proportional valve
Speed is in 10-15l/min.
Further, in described step 3), when rubber pneumatic bag is inflated, the intake velocity controlling the first proportional valve is in 50-
60l/min.
After the present invention, by evacuation, the impact of the produced gas such as early stage operation and residual solvent can be eliminated,
Both the gas between motor body and heat insulation layer can have been eliminated, the gas between heat insulation layer and rubber pneumatic bag can also have been eliminated；
Air bag pressurization paster under vacuum conditions, it is to avoid bring the gas that operation produces into；Normal pressure is combined with air compressor machine, improves further
The pressure of rubber pneumatic bag paster, is favorably improved sticking effect；By the open and-shut mode of each changeover valve, by proportional valve, stream
Amount detector, air gauge and vacuum chamber vacuum degree are adjusted to air mass flow and control, vacuum described in effective precise control
The pressure of cabin and described rubber pneumatic bag and the purpose of change shape, thus eliminating heat insulation layer local buckling, lacking the defects such as material
With the quality problems of heat insulation layer thickness difference, product examined by ground experiment.The present invention has been successfully applied to multiple development models
Product, its bonding quality and type face presentation quality are significantly improved.
Brief description
The structural representation of the air distribution system that Fig. 1 provides for the present invention.
Specific embodiment
With reference to embodiments and accompanying drawing is further illustrating the present invention, but the scope of protection of present invention is not limited to
Scope in embodiment statement.
Embodiment 1:
A kind of air distribution system manufacturing for electromotor heat insulation layer, including the first switching passing sequentially through pipeline connection
Valve 5, the second changeover valve 6, the 3rd changeover valve 7 and the 4th changeover valve 8, the 4th changeover valve 8 and the first changeover valve 5 connect and compose circulation
Passage, the wherein first changeover valve 5 is also associated with vacuum pump 1 and vacuum chamber 2, and the second changeover valve 6 is connected with rubber pneumatic bag 3, and the 3rd
Changeover valve 7 is additionally provided with emptying pipeline, and the 4th changeover valve 8 is also associated with air compressor machine 4.Described first changeover valve 5 and the second changeover valve 6
Between pressure gauge 9 is installed.
The control method of described system, concretely comprises the following steps:
1) adiabatic layer material is placed in the inside of motor body, and rubber pneumatic bag 3 is placed in adiabatic layer material, then
Electromotor is placed in vacuum chamber 4, opens vacuum pump 1, the first changeover valve 5 and the second changeover valve 6, close other valves；To true
Empty cabin 2 and rubber pneumatic bag 3 are evacuated to -0.096mpa, then maintain this vacuum 1h；
2) close the first changeover valve 5, open the second changeover valve 6, the 3rd changeover valve 7, make in rubber pneumatic bag 3 air inlet to normal
Pressure；
3) open the second changeover valve 6, the 3rd changeover valve 7, the 4th changeover valve 8 and air compressor machine 4, rubber pneumatic bag 3 is inflated to
The requirement setting, and pressurize 1h；
4) close vacuum pump 1, air compressor machine 4, open the first changeover valve 5, the second changeover valve 6 and the 3rd changeover valve 7, make vacuum
The internal pressure of cabin 2 and rubber pneumatic bag 3 is changed into normal pressure, takes out electromotor；
The preparation of electromotor heat insulation layer can be realized by the operation of above-mentioned steps to put in place；Complete heat insulation layer in-engine
The controlled stickup of vacuum.
Embodiment 2:
A kind of air distribution system manufacturing for electromotor heat insulation layer, including the first switching passing sequentially through pipeline connection
Valve 5, the second changeover valve 6, the 3rd changeover valve 7 and the 4th changeover valve 8, the 4th changeover valve 8 and the first changeover valve 5 connect and compose circulation
Passage, the wherein first changeover valve 5 is also associated with vacuum pump 1 and vacuum chamber 2, and the second changeover valve 6 is connected with rubber pneumatic bag 3, and the 3rd
Changeover valve 7 is additionally provided with emptying pipeline, and the 4th changeover valve 8 is also associated with air compressor machine 4.Described first changeover valve 5 and the second changeover valve 6
Between pressure gauge 9 is installed.Between described second changeover valve 6 and the 3rd changeover valve 7, flow monitoring instrument 10 is installed.
The control method of described system, concretely comprises the following steps:
1) adiabatic layer material is placed in the inside of motor body, and rubber pneumatic bag 3 is placed in adiabatic layer material, then
Electromotor is placed in vacuum chamber 4, opens vacuum pump 1, the first changeover valve 5 and the second changeover valve, close other valves；To vacuum
Cabin 2 and rubber pneumatic bag 3 are evacuated to -0.096mpa, then maintain this vacuum 2h；
2) close the first changeover valve 5, open the second changeover valve 6, the 3rd changeover valve 7, make in rubber pneumatic bag 3 air inlet to normal
Pressure；
3) open the second changeover valve 6, the 3rd changeover valve 7, the 4th changeover valve 8 and air compressor machine 4, rubber pneumatic bag 3 is inflated to
The requirement setting, and pressurize 1h；
4) close vacuum pump 1, air compressor machine 4, open the first changeover valve 5, the second changeover valve 6 and the 3rd changeover valve 7, make vacuum
The internal pressure of cabin 2 and rubber pneumatic bag 3 is changed into normal pressure, takes out electromotor；
The preparation of electromotor heat insulation layer can be realized by the operation of above-mentioned steps to put in place；Complete heat insulation layer in-engine
The controlled stickup of vacuum.
Embodiment 3:
A kind of air distribution system manufacturing for electromotor heat insulation layer, including the first switching passing sequentially through pipeline connection
Valve 5, the second changeover valve 6, the 3rd changeover valve 7 and the 4th changeover valve 8, the 4th changeover valve 8 and the first changeover valve 5 connect and compose circulation
Passage, the wherein first changeover valve 5 is also associated with vacuum pump 1 and vacuum chamber 2, and the second changeover valve 6 is connected with rubber pneumatic bag 3, and the 3rd
Changeover valve 7 is additionally provided with emptying pipeline, and the 4th changeover valve 8 is also associated with air compressor machine 4.Described first changeover valve 5 and the second changeover valve 6
Between pressure gauge 9 is installed.Between described second changeover valve 6 and the 3rd changeover valve 7, flow monitoring instrument 10 is installed.Described 3rd
First proportional valve 11 is installed between changeover valve 7 and the 4th changeover valve 8, the emptying pipeline of the 3rd changeover valve 7 is provided with second to be determined
Amount valve 12.
The control method of described system, concretely comprises the following steps:
1) adiabatic layer material is placed in the inside of motor body, and rubber pneumatic bag 3 is placed in adiabatic layer material, then
Electromotor is placed in vacuum chamber 4, opens vacuum pump 1, the first changeover valve 5 and the second changeover valve, close other valves；To vacuum
Cabin 2 and rubber pneumatic bag 3 are evacuated to -0.096mpa, then maintain this vacuum 2h；
2) close the first changeover valve 5, open the second changeover valve 6, the 3rd changeover valve 7, by the second proportional valve 12 control into
Gas speed, in 10l/min, makes in rubber pneumatic bag 3 air inlet to normal pressure；
3) open the second changeover valve 6, the 3rd changeover valve 7, the 4th changeover valve 8 and air compressor machine 4, control the first proportional valve 11
Intake velocity is in 50l/min.Rubber pneumatic bag 3 is inflated to the requirement of setting, and pressurize 1h；
4) close vacuum pump 1, air compressor machine 4, open the first changeover valve 5, the second changeover valve 6 and the 3rd changeover valve 7, make vacuum
The internal pressure of cabin 2 and rubber pneumatic bag 3 is changed into normal pressure, takes out electromotor；
The preparation of electromotor heat insulation layer can be realized by the operation of above-mentioned steps to put in place；Complete heat insulation layer in-engine
The controlled stickup of vacuum.
Embodiment 4:
A kind of air distribution system manufacturing for electromotor heat insulation layer, including the first switching passing sequentially through pipeline connection
Valve 5, the second changeover valve 6, the 3rd changeover valve 7 and the 4th changeover valve 8, the 4th changeover valve 8 and the first changeover valve 5 connect and compose circulation
Passage, the wherein first changeover valve 5 is also associated with vacuum pump 1 and vacuum chamber 2, and the second changeover valve 6 is connected with rubber pneumatic bag 3, and the 3rd
Changeover valve 7 is additionally provided with emptying pipeline, and the 4th changeover valve 8 is also associated with air compressor machine 4.Described first changeover valve 5 and the second changeover valve 6
Between pressure gauge 9 is installed.Between described second changeover valve 6 and the 3rd changeover valve 7, flow monitoring instrument 10 is installed.Described 3rd
First proportional valve 11 is installed between changeover valve 7 and the 4th changeover valve 8, the emptying pipeline of the 3rd changeover valve 7 is provided with second to be determined
Amount valve 12.Described first proportional valve 11 and the second proportional valve 12 adopt numerical control pattern.
The control method of described system, concretely comprises the following steps:
1) adiabatic layer material is placed in the inside of motor body, and rubber pneumatic bag 3 is placed in adiabatic layer material, then
Electromotor is placed in vacuum chamber 4, opens vacuum pump 1, the first changeover valve 5 and the second changeover valve, close other valves；To vacuum
Cabin 2 and rubber pneumatic bag 3 are evacuated to -0.096mpa, then maintain this vacuum 3h；
2) close the first changeover valve 5, open the second changeover valve 6, the 3rd changeover valve 7, by the second proportional valve 12 control into
Gas speed, in 15l/min, makes in rubber pneumatic bag 3 air inlet to normal pressure；
3) open the second changeover valve 6, the 3rd changeover valve 7, the 4th changeover valve 8 and air compressor machine 4, control the first proportional valve 11
Intake velocity is in 60l/min.Rubber pneumatic bag 3 is inflated to the requirement of setting, and pressurize 1h；
4) close vacuum pump 1, air compressor machine 4, open the first changeover valve 5, the second changeover valve 6 and the 3rd changeover valve 7, make vacuum
The internal pressure of cabin 2 and rubber pneumatic bag 3 is changed into normal pressure, takes out electromotor；
The preparation of electromotor heat insulation layer can be realized by the operation of above-mentioned steps to put in place；Complete heat insulation layer in-engine
The controlled stickup of vacuum.
Embodiment 5:
A kind of air distribution system manufacturing for electromotor heat insulation layer, including the first switching passing sequentially through pipeline connection
Valve 5, the second changeover valve 6, the 3rd changeover valve 7 and the 4th changeover valve 8, the 4th changeover valve 8 and the first changeover valve 5 connect and compose circulation
Passage, the wherein first changeover valve 5 is also associated with vacuum pump 1 and vacuum chamber 2, and the second changeover valve 6 is connected with rubber pneumatic bag 3, and the 3rd
Changeover valve 7 is additionally provided with emptying pipeline, and the 4th changeover valve 8 is also associated with air compressor machine 4.Described first changeover valve 5 and the second changeover valve 6
Between pressure gauge 9 is installed.Between described second changeover valve 6 and the 3rd changeover valve 7, flow monitoring instrument 10 is installed.Described 3rd
First proportional valve 11 is installed between changeover valve 7 and the 4th changeover valve 8, the emptying pipeline of the 3rd changeover valve 7 is provided with second to be determined
Amount valve 12.Described first proportional valve 11 and the second proportional valve 12 adopt numerical control pattern.
The control method of described system, concretely comprises the following steps:
1) adiabatic layer material is placed in the inside of motor body, and rubber pneumatic bag 3 is placed in adiabatic layer material, then
Electromotor is placed in vacuum chamber 4, opens vacuum pump 1, the first changeover valve 5 and the second changeover valve, close other valves；To vacuum
Cabin 2 and rubber pneumatic bag 3 are evacuated to -0.096mpa, then maintain this vacuum 3h；
2) close the first changeover valve 5, open the second changeover valve 6, the 3rd changeover valve 7, by the second proportional valve 12 control into
Gas speed, in 12l/min, makes in rubber pneumatic bag 3 air inlet to normal pressure；
3) open the second changeover valve 6, the 3rd changeover valve 7, the 4th changeover valve 8 and air compressor machine 4, control the first proportional valve 11
Intake velocity is in 55l/min.Rubber pneumatic bag 3 is inflated to the requirement of setting, and pressurize 1h；
4) close vacuum pump 1, air compressor machine 4, open the first changeover valve 5, the second changeover valve 6 and the 3rd changeover valve 7, make vacuum
The internal pressure of cabin 2 and rubber pneumatic bag 3 is changed into normal pressure, takes out electromotor；
The preparation of electromotor heat insulation layer can be realized by the operation of above-mentioned steps to put in place；Complete heat insulation layer in-engine
The controlled stickup of vacuum.
Claims (8)
1. a kind of for electromotor heat insulation layer manufacture air distribution system it is characterised in that: include pass sequentially through pipeline connect
The first changeover valve (5), the second changeover valve (6), the 3rd changeover valve (7) and the 4th changeover valve (8), the 4th changeover valve (8) and the
One changeover valve (5) connects and composes circulation canal, and the wherein first changeover valve (5) is also associated with vacuum pump (1) and vacuum chamber (2), the
Two changeover valve (6) are connected with rubber pneumatic bag (3), and the 3rd changeover valve (7) is additionally provided with emptying pipeline, and the 4th changeover valve (8) is also connected with
There is air compressor machine (4).
2. system according to claim 1 it is characterised in that: described the first changeover valve (5) and the second changeover valve (6) it
Between pressure gauge (9) is installed.
3. system according to claim 1 it is characterised in that: between described second changeover valve (6) and the 3rd changeover valve (7)
Flow monitoring instrument (10) is installed.
4. system according to claim 1 it is characterised in that: between described 3rd changeover valve (7) and the 4th changeover valve (8)
First proportional valve (11) is installed, the emptying pipeline of the 3rd changeover valve (7) is provided with the second proportional valve (12).
5. system according to claim 4 it is characterised in that: described first proportional valve (11) and the second proportional valve (12) are adopted
Use numerical control pattern.
6. according to claim 1-5 any one the control method of system it is characterised in that concretely comprising the following steps:
1) adiabatic layer material is placed in the inside of motor body, and rubber pneumatic bag (3) is placed in adiabatic layer material, then will
Electromotor is placed in vacuum chamber (2), opens vacuum pump (1), the first changeover valve (5) and the second changeover valve, closes other valves；Right
Vacuum chamber (2) and rubber pneumatic bag (3) are evacuated to -0.096mpa, then maintain this vacuum 1-3h；
2) close the first changeover valve (5), open the second changeover valve (6), the 3rd changeover valve (7), make the interior air inlet of rubber pneumatic bag (3) extremely
Normal pressure；
3) the second changeover valve (6), the 3rd changeover valve (7), the 4th changeover valve (8) and air compressor machine (4) are opened, to rubber pneumatic bag (3)
It is inflated to the requirement of setting, and pressurize 1h；
4) close vacuum pump (1), air compressor machine (4), open the first changeover valve (5), the second changeover valve (6) and the 3rd changeover valve (7),
Make vacuum chamber (2) and the internal pressure of rubber pneumatic bag (3) be changed into normal pressure, take out electromotor；
The preparation of electromotor heat insulation layer can be realized by the operation of above-mentioned steps to put in place.
7. control method according to claim 6 it is characterised in that: described step 2) in, the interior air inlet to rubber pneumatic bag (3)
During to normal pressure, intake velocity is controlled in 10-15l/min by the second proportional valve (12).
8. control method according to claim 6 it is characterised in that: in described step 3), to rubber pneumatic bag (3) inflate
When, the intake velocity controlling the first proportional valve (11) is in 50-60l/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510246473.4A CN104875470B (en) | 2015-05-15 | 2015-05-15 | Air distribution system for manufacturing engine heat insulation layer and control method of air distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510246473.4A CN104875470B (en) | 2015-05-15 | 2015-05-15 | Air distribution system for manufacturing engine heat insulation layer and control method of air distribution system |
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| Publication Number | Publication Date |
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| CN104875470A CN104875470A (en) | 2015-09-02 |
| CN104875470B true CN104875470B (en) | 2017-01-25 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107584771B (en) * | 2016-11-03 | 2020-05-29 | 湖北航天化学技术研究所 | Method for forming internal heat insulation layer of solid rocket engine |
| CN111361061B (en) * | 2020-03-26 | 2022-08-05 | 上海航天化工应用研究所 | Automatic control system for vacuum paster on heat insulating layer of combustion chamber and operation method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61274919A (en) * | 1985-05-31 | 1986-12-05 | Nissan Motor Co Ltd | Method for laminating insulator preform to inner surface of case |
| JPH0247041A (en) * | 1988-08-09 | 1990-02-16 | Nissan Motor Co Ltd | Method for sticking insulator to inner face of container |
| TWI230222B (en) * | 2003-11-21 | 2005-04-01 | Chung Shan Inst Of Science | Insulator forming method and device thereof for a rocket motor casing |
| CN102632683B (en) * | 2012-03-30 | 2014-10-29 | 湖北三江航天江北机械工程有限公司 | Manufacturing method for manual patch of heat insulating layer of filament winding engine shell |
| CN103847056B (en) * | 2012-11-29 | 2016-08-03 | 上海新力动力设备研究所 | Electromotor internal insulation integral die mould and mould pressing method |
| CN104552692B (en) * | 2013-10-28 | 2017-06-13 | 湖北航天化学技术研究所 | A kind of middle-size and small-size solid propellant rocket internal insulation bulge forming frock |
| CN204641012U (en) * | 2015-05-15 | 2015-09-16 | 湖北三江航天江河化工科技有限公司 | A kind of air distribution system manufactured for engine heat insulation layer |
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Inventor after: Zhu Jialin Inventor after: Zhao Bijuan Inventor after: Zhang Hao Inventor after: Zeng Qingjiang Inventor after: Song Kaosheng Inventor after: Shu Liangjun Inventor after: Chen Yongzhao Inventor after: Dong Xiaohong Inventor after: Li Fangshuo Inventor after: Liu Meizhen Inventor after: Wang Yu Inventor after: Chen Liping Inventor after: Hu Qiuming Inventor after: Liu Wenhui Inventor before: Zhu Jialin Inventor before: Shu Liangjun Inventor before: Chen Yongzhao Inventor before: Dong Xiaohong Inventor before: Li Fangshuo Inventor before: Liu Meizhen Inventor before: Zhao Bijuan Inventor before: Zhang Hao Inventor before: Zeng Qingjiang Inventor before: Song Kaosheng |
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