CN108722213A - A kind of high undersea hydrostatic pressures pulsed discharge cause bubble method and device - Google Patents
A kind of high undersea hydrostatic pressures pulsed discharge cause bubble method and device Download PDFInfo
- Publication number
- CN108722213A CN108722213A CN201810564262.9A CN201810564262A CN108722213A CN 108722213 A CN108722213 A CN 108722213A CN 201810564262 A CN201810564262 A CN 201810564262A CN 108722213 A CN108722213 A CN 108722213A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/235—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/238—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using vibrations, electrical or magnetic energy, radiations
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Generation Of Surge Voltage And Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of high undersea hydrostatic pressures pulsed discharges, and bubble method and device, device to be caused to include host computer, boost module, energy-storage module, high-voltage switch gear, cause bubble module；Boost module includes low-tension supply, high frequency boost module and voltage doubling rectifing circuit, the host computer connects high-voltage switch gear by singlechip controller, the low-tension supply passes sequentially through high frequency boost module and connects high-voltage switch gear with voltage doubling rectifing circuit, and the energy-storage module connects high-voltage switch gear with cause bubble module.The position that the present apparatus generates cavitation bubble by high pressure pulse discharge can be adjusted by discharge electrode position, and the serial number by increasing and decreasing more voltage-doubling boost circuits changes cavitation bubble size, to the cavitation bubble that forming position is accurate, size is controllable.
Description
Technical field
Bulb apparatus is caused the present invention relates to a kind of high undersea hydrostatic pressures pulsed discharge and uses its method, belongs to physics field.
Background technology
Vacuole cavitation cavitation be using liquid as the rotating machinery of medium in the phenomenon that often having, the propeller of ship can be caused to damage
It is bad, or even the solid materials such as hull can be damaged and cause serious consequence.With the progress and development of science, vacuole cavitation cavitation is studied
This phenomenon advantageously reduces harm of the vacuole cavitation cavitation to underwater surface structure object.Vacuole cavitation cavitation may be alternatively used for
Water process, medicine is for cancer, drug delivery in cell, the multiple fields such as cleaning of fruits and vegetables and material surface.
Invention content
It is an object of the present invention to overcome defect of the existing technology, prior art problem is solved, is proposed a kind of underwater
High pressure pulse discharge causes bulb apparatus and method, for generating underwater cavitating bubble.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme：A kind of water
Lower high pressure pulse discharge causes bubble system, including host computer, boost module, energy-storage module, high-voltage switch gear, cause bubble module；
The boost module includes low-tension supply, high frequency boost module and voltage doubling rectifing circuit, the host computer connection
High-voltage switch gear, the low-tension supply pass sequentially through high frequency boost module and connect high-voltage switch gear, the energy storage with voltage doubling rectifing circuit
Module connects high-voltage switch gear with cause bubble module.
The voltage doubling rectifing circuit is using the more voltage doubling rectifing circuits in Wall, including diode and high pressure tile electricity
Hold.
Above-mentioned energy-storage module is formed by several identical high pressure ceramic disc capacitor connection in series-parallel, and the capacitance of ceramic disc capacitor is
0.1uF, pressure voltage 2kV, entire energy-storage module have a several branch circuit parallel connections, each branch route the series connection of several capacitances and
At.
Above-mentioned high-voltage switch gear includes high-voltage switch gear main body and the control unit of high-voltage switch gear；
The high-voltage switch gear main body includes stepper motor, acrylic cylinder, shaft coupling and three hard contacts, the stepping
Motor is connect by shaft coupling with acrylic cylinder, in acrylic cylinder far from being equipped in the normal direction at the endpoint of shaft coupling one end
Movable contact of one hard contact as high-voltage switch gear, in vertical with movable contact same plane and with step motor shaft
There are two stationary contact of the hard contact as high-voltage switch gear, respectively charging contact and discharge contact for installation in plane, wherein fills
Electric contact connects charging circuit, and discharge contact connects discharge circuit, and movable contact is the common in two circuits；By controlling stepping electricity
Machine rotate, and then drive acrylic cylinder on movable contact contact two stationary contacts in one realization energy-storage module charging or
Electric discharge.
The control unit of the high-voltage switch gear includes singlechip controller, motor driving and bluetooth module, bluetooth therein
Module and motor driving are all connected directly with singlechip controller, when needing to make switch motion, pass through the bluetooth connection of mobile phone terminal
The bluetooth module of high-voltage switch gear control unit, is sent to the action command of switch, and bluetooth module is passed after receiving order
It send to singlechip controller, corresponding pulse signal is sent out to stepping according to order after the order that singlechip controller identification receives
Motor drives, and then controlling stepper motor rotation makes movable contact and corresponding stationary contact point contact, realization high-voltage switch gear contact be opened and closed
Program control.
Above-mentioned singlechip controller is STC89C52 single chip.
Above-mentioned host computer, is write using C#, is communicated with singlechip controller by bluetooth, is controlled the charging of the present apparatus
Journey and discharge process.
Module, including discharge electrode and its fixing device are steeped in above-mentioned cause, and the discharge electrode is used as using polishing tungsten bar and is put
Electrode.
A kind of high undersea hydrostatic pressures pulsed discharge cause bubble application method, using above-mentioned device, steps are as follows：
(1) start singlechip controller switch button, complete singlechip controller initial work, establish microcontroller control
The wireless blue tooth of device and host computer connects；
(2) adjustment causes bubble modular device, into the water accurate location；
(3) motor coarse adjustment and trim button in host computer are clicked, and control high-voltage switch gear rotates to initial position；
(4) low-voltage power switch is opened, low-tension supply input is adjusted；
(5) charge command is sent to the control unit of high-voltage switch gear by bluetooth, after control unit receives order, control is high
The charging contact to compress switch is closed；
(6) some time is waited for, electric discharge order is sent to the control unit of high-voltage switch gear by bluetooth, control unit receives
After order, the discharge contact for controlling high-voltage switch gear is closed；
(7) cause bubble to terminate, close low-voltage power switch and singlechip controller switch.
Beneficial effects of the present invention are as follows：
The present invention generates high-voltage pulse in water by discharge electrode, and cavitation bubble is generated in water by pulsed discharge.It is logical
Overregulate discharge electrode position increase, the serial number generation position that subtracts more voltage-doubling boost circuits it is accurate, the controllable cavitation bubble of size.
Description of the drawings
Fig. 1 is the structure mould block diagram of the present invention；
Fig. 2 is ten times of multiplication of voltage modular structure schematic diagrams of the present invention；
Fig. 3 is the energy-storage module circuit structure diagram of the present invention；
The equivalent capacity of Fig. 4 energy-storage modules；
Fig. 5 is the high-voltage switch gear agent structure structure chart of the present invention；
Fig. 6 is the circuit theory schematic diagram of the high-voltage switch gear control unit of the present invention；
Fig. 7 is the discharge electrode structure schematic diagram of the present invention；
Fig. 8 is the host computer schematic diagram of the present invention；
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.Following embodiment is only used for more clearly illustrating the skill of the present invention
Art scheme, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, a kind of high undersea hydrostatic pressures pulsed discharge causes bulb apparatus, which is characterized in that including host computer, boosting mould
Block, high-voltage switch gear, causes bubble module at energy-storage module；
The boost module includes low-tension supply, high frequency boost module and voltage doubling rectifing circuit, the host computer connection
High-voltage switch gear, the low-tension supply pass sequentially through high frequency boost module and connect high-voltage switch gear, the energy storage with voltage doubling rectifing circuit
Module connects high-voltage switch gear with cause bubble module.
Low-tension supply is provided by rearrangeable switch power supply, adjustable range DC5-12V.High frequency boost module is that kilovolt high frequency is high
Pressing plate CL-1 circuit boards, using the DC low-voltage of low-tension supply as input, output frequency is about 47kHz, voltage range 1000-
The alternating voltage of 2000V, output variation with the direct current input variation that low-tension supply provides, the output of CL-1 circuit boards is as more
The input of voltage-multiplying circuit, voltage-multiplying circuit in booster circuit plate using the more voltage doubling rectifing circuits in Wall, by diode and
High pressure ceramic disc capacitor is constituted, as shown in Fig. 2, terminal a and b connect alternating voltage input, the ends terminal e and f export DC voltage, when need
Connect multiple circuits when, endpoint a, b of the latter voltage-multiplying circuit connect c, d endpoint of previous voltage-multiplying circuit respectively.According to preceding
The circuit analysis stated can be learnt：
Wherein, k is the multiplication of voltage multiple of circuit, the k=10 in above-mentioned ten voltage-multiplying circuit.In view of two poles of more voltage-multiplying circuits
Pipe and capacitance are not ideal component, and circuit will produce loss when working, the voltage of reality output is caused to reduce, therefore this booster circuit
It is connected in series using two ten voltage doubling rectifing circuits, output voltage highest can reach 15kV.
As shown in figure 3, energy-storage module is formed by 400 identical high pressure ceramic disc capacitor connection in series-parallel, the capacitance of ceramic disc capacitor
Value is 0.1uF, pressure voltage 2kV, and entire energy-storage module has 20 branch circuit parallel connections, each branch route 20 capacitances series connection and
At.
If the equivalent capacity of branch 1 is Ceq1, from capacitance series connection formula
Since each branch is all identical, therefore have
Ceq1=Ceq2=Ceq3=L=Ceq20=0.005uF
Wherein, the pressure voltage of every branch equivalent capacity is all 20 × 2kV=40kV, and in parallel 20 branches can wait again
Effect is a capacitance Ceq, from capacitance parallel connection formula
Ceq=Ceq1+Ceq2+Ceq3+L+Ceq20=20Ceq1=0.1uF
Wherein, equivalent capacity CeqPressure voltage be 40kV by analyzing above, it is recognised that entire energy-storage module can wait
Effect is capacitance shown in Fig. 4, and the capacitance of the equivalent capacity is 0.1uF, pressure voltage 40kV.
As shown in figure 5, high-voltage switch gear, includes the control unit of high-voltage switch gear main body and high-voltage switch gear.High-voltage switch gear main body
Pass through shaft coupling 2 and acrylic including stepper motor 1, acrylic cylinder 3, shaft coupling 2 and three hard contacts, stepper motor 1
Cylinder 3 connects, and in acrylic cylinder 3, far from installation in the normal direction at the endpoint of shaft coupling one end, there are one hard contacts as high pressure
The movable contact 4 of switch, in there are two gold for installation with movable contact same plane and in the plane vertical with step motor shaft
Belong to stationary contact of the contact as high-voltage switch gear, respectively charging contact 5 and discharge contact 6, wherein charging contact 5 connects charging electricity
Road, discharge contact 6 connect discharge circuit, and movable contact is the common in two circuits.Stepper motor rotation is controlled by program, into
And the movable contact on acrylic cylinder is driven to contact the charge or discharge that some stationary contact realizes energy-storage module.Acrylic material
With excellent insulation performance, movable contact is isolated by acrylic cylinder 3 and ensure that the operation of stepper motor 1 will not be by high pressure
The influence of electrical circuit.
The control unit of high-voltage switch gear includes singlechip controller, motor driving and bluetooth module, bluetooth module therein
It is all connected directly with singlechip controller with motor driving.When needing to make switch motion, only it need to pass through the bluetooth connection of mobile phone terminal
The bluetooth module of high-voltage switch gear control unit, is then sent to the action command of switch, and bluetooth module will after receiving order
It is sent to singlechip controller, after the order that singlechip controller identification receives according to order send out corresponding pulse signal to
Stepper motor drives, and then control stepper motor rotation makes movable contact and corresponding stationary contact point contact, realizes high-voltage switch gear contact
The program of opening and closing controls.Singlechip controller is STC89C52 single chip.
The hardware design of high-voltage switch gear control unit is mainly the design of high-voltage switch gear control unit circuit, including
The STC89C52 single chip and Interface design of bluetooth module, STC89C52 single chip and motor-driven Interface design and its circuit
The circuit theory schematic diagram of line graph, high-voltage switch gear control unit is as shown in Figure 6.The control circuit is relatively simple, and STC89C52 is mono-
Piece machine can be used the simple STC89C52 single chip of programming, and STC89C52 single chip tool, can be with there are one full duplex serial port
For carrying out data transmission with bluetooth；For bluetooth module using HC-05 bluetooth modules, HC05 is the bluetooth serial ports of principal and subordinate's one
Module, self-carried USB turn serial ports, can be connect with STC89C52 single chip directly as serial ports, using simple；Stepper motor drives
It is TB6560-V3 drivers.The supply voltage of STC89C52 single chip and bluetooth is 5V, and driver supply voltage is 24V.
STC89C52 single chip is connect with bluetooth by serial ports, wherein the data receiver pin and bluetooth module of STC89C52 single chip
The data of serial ports send pin and are connected, and data send pin and are connected with the data receiver pin of bluetooth module serial ports.Motor drives
Device uses common cathode connection, enabled negative terminal EN-, direction negative terminal DIR- and pulse negative terminal PUL- to connect low level, enable anode EN
+, direction anode DIR+ and pulse anode PUL+ connects P1.0, P1.1 and P1.2 mouth of STC89C52 single chip respectively and high level has
Effect is respectively used to export enabled motor, control direction of motor rotation and rotate the signal of step number, four terminal A+ of driver,
A-, B+, B- are the interface being connected with four line stepper motor of two-phase.
As shown in fig. 7, causing bubble module, including discharge electrode 14 and its fixing device, discharge electrode is made using polishing tungsten bar
For discharge electrode, diameter is optional, generally 0.5mm, and fixing device is by insulating coating 11, fixed link 12,13 structure of fixing screws
At can be by changing the arcing distance of discharge electrode to the adjusting of fixed link.
As shown in figure 8, host computer, is write using C#, communicated with STC89C52 single chip controller by bluetooth, control is originally
The charging process and discharge process of device.
A kind of high undersea hydrostatic pressures pulsed discharge cause bubble application method, steps are as follows：
(1) start STC89C52 single chip controller switches button, complete the initial chemical industry of STC89C52 single chip controller
Make, the wireless blue tooth for establishing STC89C52 single chip controller and host computer connects；
(2) the fixing device for adjusting discharge module, makes discharge electrode accurate location into the water；
(3) motor coarse adjustment and trim button in host computer are clicked, and control high-voltage switch gear rotates to initial position；
(4) low-voltage power switch is opened, low-tension supply input is adjusted；
(5) charge command is sent to the control unit of high-voltage switch gear by bluetooth, after control unit receives order, control is high
The charging contact to compress switch is closed；
(6) some time is waited for, electric discharge order is sent to the control unit of high-voltage switch gear by bluetooth, control unit receives
After order, the discharge contact for controlling high-voltage switch gear is closed；
(7) cause bubble to terminate, close low-voltage power switch and STC89C52 single chip controller switches.
Claims (8)
1. a kind of high undersea hydrostatic pressures pulsed discharge causes bulb apparatus, which is characterized in that including host computer, boost module, energy-storage module, height
It compresses switch, cause bubble module；
The boost module includes low-tension supply, high frequency boost module and voltage doubling rectifing circuit, and the host computer connects high pressure
Switch, the low-tension supply pass sequentially through high frequency boost module and connect high-voltage switch gear, the energy-storage module with voltage doubling rectifing circuit
High-voltage switch gear is connected with cause bubble module.
2. a kind of high undersea hydrostatic pressures pulsed discharge according to claim 1 causes bulb apparatus, which is characterized in that the voltage multiplying rectifier
Circuit is using the more voltage doubling rectifing circuits in Wall, including diode and high pressure ceramic disc capacitor.
3. a kind of high undersea hydrostatic pressures pulsed discharge according to claim 1 causes bulb apparatus, which is characterized in that the energy storage mould
Block is formed by several identical high pressure ceramic disc capacitor connection in series-parallel, and the capacitance of ceramic disc capacitor is 0.1uF, pressure voltage 2kV, whole
A energy-storage module has several branch circuit parallel connections, each branch to route several capacitances and be connected in series.
4. a kind of high undersea hydrostatic pressures pulsed discharge according to claim 1 causes bulb apparatus, which is characterized in that the height presses off
Pass includes high-voltage switch gear main body and the control unit of high-voltage switch gear；
The high-voltage switch gear main body includes stepper motor, acrylic cylinder, shaft coupling and three hard contacts, the stepper motor
Connect with acrylic cylinder by shaft coupling, acrylic cylinder far from the normal direction at the endpoint of shaft coupling one end installation there are one
Movable contact of the hard contact as high-voltage switch gear, in movable contact same plane and the plane vertical with step motor shaft
There are two stationary contact of the hard contact as high-voltage switch gear, respectively charging contact and discharge contact for upper installation, wherein charging is touched
Point connects charging circuit, and discharge contact connects discharge circuit, and movable contact is the common in two circuits；By controlling stepper motor rotation
Turn, and then the movable contact on acrylic cylinder is driven to contact a charging for realizing energy-storage module in two stationary contacts or put
Electricity；
The control unit of the high-voltage switch gear includes singlechip controller, motor driving and bluetooth module, bluetooth module therein
It is all connected directly with singlechip controller with motor driving, when needing to make switch motion, passes through the bluetooth connection high pressure of mobile phone terminal
The bluetooth module of switch control unit, is sent to the action command of switch, and bluetooth module is sent to after receiving order
Singlechip controller sends out corresponding pulse signal to stepper motor after the order that singlechip controller identification receives according to order
Driving, and then control stepper motor rotation makes movable contact and corresponding stationary contact point contact, realizes the journey of high-voltage switch gear contact opening and closing
Sequence controls.
5. a kind of high undersea hydrostatic pressures pulsed discharge according to claim 4 causes bulb apparatus, which is characterized in that the microcontroller control
Device processed is STC89C52 single chip.
6. a kind of high undersea hydrostatic pressures pulsed discharge according to claim 1 causes bulb apparatus, which is characterized in that described is upper
Machine is write using C#, is communicated with singlechip controller by bluetooth, controls the charging process and discharge process of the present apparatus.
7. a kind of high undersea hydrostatic pressures pulsed discharge according to claim 1 causes bulb apparatus, which is characterized in that mould is steeped in the cause
Block, including discharge electrode and its fixing device, the discharge electrode is using polishing tungsten bar as discharge electrode.
8. a kind of high undersea hydrostatic pressures pulsed discharge causes bubble application method, it is characterised in that utilize the device described in claim 4, step
It is as follows：
Start singlechip controller switch button, complete singlechip controller initial work, establish singlechip controller with it is upper
The wireless blue tooth connection of position machine；
（2）Adjustment causes bubble modular device, into the water accurate location；
Motor coarse adjustment and trim button in host computer are clicked, control high-voltage switch gear rotates to initial position；
Low-voltage power switch is opened, low-tension supply input is adjusted；
Charge command is sent to the control unit of high-voltage switch gear by bluetooth, after control unit receives order, controls high-voltage switch gear
Charging contact be closed；
The some time is waited for, electric discharge order is sent to the control unit of high-voltage switch gear by bluetooth, control unit receives order
Afterwards, the discharge contact for controlling high-voltage switch gear is closed；
It causes bubble to terminate, closes low-voltage power switch and singlechip controller switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810564262.9A CN108722213B (en) | 2018-06-04 | 2018-06-04 | Method and device for discharging bubbles by underwater high-voltage pulse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810564262.9A CN108722213B (en) | 2018-06-04 | 2018-06-04 | Method and device for discharging bubbles by underwater high-voltage pulse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108722213A true CN108722213A (en) | 2018-11-02 |
| CN108722213B CN108722213B (en) | 2021-09-07 |
Family
ID=63931873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810564262.9A Active CN108722213B (en) | 2018-06-04 | 2018-06-04 | Method and device for discharging bubbles by underwater high-voltage pulse |
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| Country | Link |
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| CN (1) | CN108722213B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110733616A (en) * | 2019-10-28 | 2020-01-31 | 河海大学常州校区 | High-voltage pulse discharge hull surface cleaning device and method carried by underwater robot |
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|---|---|---|---|---|
| CN102141523A (en) * | 2010-12-23 | 2011-08-03 | 哈尔滨工程大学 | Experimental device and experimental method for generation of bubbles of electric spark in water |
| CN103528793A (en) * | 2013-10-27 | 2014-01-22 | 广西科技大学 | Underwater high-voltage discharge bubble generation device |
| CN104330049A (en) * | 2014-09-28 | 2015-02-04 | 北京联合大学 | Portable locomotive vehicle wheel pair surface wearing automatic detection device and detection method |
| WO2017149654A1 (en) * | 2016-03-01 | 2017-09-08 | ヒロセ・ユニエンス株式会社 | Gas introducing/retaining device, gas introducing/retaining method, and gas release head |
-
2018
- 2018-06-04 CN CN201810564262.9A patent/CN108722213B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141523A (en) * | 2010-12-23 | 2011-08-03 | 哈尔滨工程大学 | Experimental device and experimental method for generation of bubbles of electric spark in water |
| CN103528793A (en) * | 2013-10-27 | 2014-01-22 | 广西科技大学 | Underwater high-voltage discharge bubble generation device |
| CN104330049A (en) * | 2014-09-28 | 2015-02-04 | 北京联合大学 | Portable locomotive vehicle wheel pair surface wearing automatic detection device and detection method |
| WO2017149654A1 (en) * | 2016-03-01 | 2017-09-08 | ヒロセ・ユニエンス株式会社 | Gas introducing/retaining device, gas introducing/retaining method, and gas release head |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110733616A (en) * | 2019-10-28 | 2020-01-31 | 河海大学常州校区 | High-voltage pulse discharge hull surface cleaning device and method carried by underwater robot |
| CN110733616B (en) * | 2019-10-28 | 2021-09-14 | 河海大学常州校区 | High-voltage pulse discharge hull surface cleaning device and method carried by underwater robot |
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| Publication number | Publication date |
|---|---|
| CN108722213B (en) | 2021-09-07 |
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Inventor after: Shan Minglei Inventor after: Zhang Lu Inventor after: Gao Mei Inventor after: Li Chaohui Inventor after: Xu Zhengrong Inventor before: Zhang Lu Inventor before: Shan Minglei Inventor before: Gao Mei Inventor before: Li Chaohui Inventor before: Xu Zhengrong |
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