CN210363260U - Integrated air suspension air supply system - Google Patents
Integrated air suspension air supply system Download PDFInfo
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- CN210363260U CN210363260U CN201921398490.XU CN201921398490U CN210363260U CN 210363260 U CN210363260 U CN 210363260U CN 201921398490 U CN201921398490 U CN 201921398490U CN 210363260 U CN210363260 U CN 210363260U
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Abstract
The utility model discloses an integrated air suspension air feed system, electronic air pump device including integrated integration, the internal pipeline, ECU, pressure sensor and electromagnetism valves, electronic air pump device passes through motor drive, electronic air pump device is connected with the gas holder through internal pipeline I, electronic air pump device is connected with electromagnetism valves through internal pipeline II, electromagnetism valves is connected with air spring through internal pipeline III, electronic air pump device is connected with outside atmosphere through internal pipeline IV, electronic air pump device and electromagnetism valves all are connected with ECU, be equipped with the connector on the ECU, be equipped with the electromagnetism valves valve port on the electromagnetism valves, gas circuit interface and air filter interface, air filter interface connection has the air filter. The integrated closed-loop control can reduce energy consumption, ensure higher system availability and better performance, ensure the cyclic use under various conditions, avoid moisture and impurities from influencing the work of the system, and has compact structure, small volume and weight, light weight, energy conservation and environmental protection.
Description
Technical Field
The utility model belongs to the technical field of vehicle control, especially, relate to an integrated air suspension air supply system.
Background
At present, an air supply system of an air suspension of a vehicle generally adopts open-loop control, the open-loop control is that air for lifting a vehicle body is directly obtained from the outside atmosphere, and when the vehicle body needs to be lifted, air is sucked from the atmosphere through an electric air pump to inflate an air spring; when the vehicle body is required to be lowered, the air in the air spring is directly exhausted to the atmosphere through the exhaust valve, so that the effect of lowering the vehicle body is achieved. The open-loop control is frequently interacted with the atmosphere in the working process, so that moisture in the atmosphere can inevitably enter the electromagnetic valve bank of the system, and the work of the electromagnetic valve bank is adversely affected. However, the conventional open-loop system may overheat the compressor after two or three cycles, and since air must be discharged when the height of the vehicle body is to be adjusted down after air is sucked from the outside, the compressor may overheat after two or three cycles, and particularly, it is difficult to adjust the height of the vehicle body after several cycles in a severe high-temperature environment such as summer.
Secondly, the concept of system integration has been widely popularized today, and how to form simple integration is a more sophisticated problem in the technical field, and at the same time, the cost control and performance optimization are required. However, in the prior art, the air supply system of the air suspension is not integrated, generally comprises a plurality of dispersed components, and the air supply system is automatically adjusted by the ECU according to the signal of the sensor, so that the system integration is never performed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the not enough of above-mentioned prior art existence, provide an integrated air suspension air supply system, it has closed-loop control, guarantees the characteristics of circulation reliability, integrated integration, compact structure, lightweight and energy-concerving and environment-protective.
In order to achieve the above object, the utility model adopts the following technical scheme: an integrated air suspension air supply system comprises an electric air pump device, an internal pipeline, an ECU, a pressure sensor and an electromagnetic valve group which are integrated into a whole, wherein the electric air pump device is a driving unit and is driven by a motor, the electric air pump device is connected with an air storage tank through an internal pipeline I, the electric air pump device is connected with the electromagnetic valve group through an internal pipeline II, the electromagnetic valve group is connected with an air spring through an internal pipeline III, the electric air pump device is connected with external atmosphere through an internal pipeline IV, the electric air pump device and the electromagnetic valve group are both connected with the ECU, the ECU controls the electric air pump device and the electromagnetic valve group to enable air to be inflated or exhausted between the air storage tank and the air spring to flow in two directions so as to achieve closed-loop control, a connector is arranged on the ECU, and an electromagnetic valve group, The air filter is arranged at the end part of the internal pipeline IV communicated with the external atmosphere, and the pressure sensor is arranged at the end part of the pipeline communicated with the valve port of the solenoid valve group.
Preferably, the electric air pump device comprises an air charging and discharging electromagnetic valve, a water discharging electromagnetic valve, a throttle valve, a compressor, a one-way valve I, a one-way valve II, a one-way valve III, a one-way valve IV, a drying tank and a common electromagnetic valve, when the system is charged, air in the air storage tank is charged through the air charging and discharging electromagnetic valve and then reaches the air spring through the one-way valve I, the compressor, the common electromagnetic valve and the electromagnetic valve group; when the system exhausts, the air spring discharges air through the electromagnetic valve group, and the air passes through the common electromagnetic valve, the one-way valve IV, the compressor, the drying tank, the one-way valve II and the air charging and discharging electromagnetic valve to reach the air storage tank; when the pressure of the system is too low for air supplement, external atmosphere enters through the filtration of the air filter and reaches the air storage tank through the one-way valve III, the compressor, the drying tank, the one-way valve II and the air charging and discharging electromagnetic valve in sequence; and after the system is supplied with air, moisture blowback is carried out, the air charging and discharging electromagnetic valve and the water discharging electromagnetic valve are opened to form a blowback pipeline of the drying tank, the blowback pipeline passes through the air charging and discharging electromagnetic valve, the throttle valve, the drying tank and the water discharging electromagnetic valve and then is discharged to the atmosphere through the internal pipeline IV, and the moisture in the drying tank is discharged to the outside of the system, so that the regeneration of the drying tank is realized.
Preferably, the ECU is also in control connection with a power supply, an ignition, a CAN communication, a height sensor, an acceleration sensor, a temperature sensor, a CDC electromagnetic valve and a relay.
Preferably, the electromagnetic valve group comprises an electromagnetic valve I, an electromagnetic valve II, an electromagnetic valve III and an electromagnetic valve IV, air outlets of the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III and the electromagnetic valve IV are connected with the air spring through an internal pipeline III, and the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III and the electromagnetic valve IV are controlled by an ECU.
After the structure is adopted, compared with the prior art, the utility model the advantage that has is: the utility model has simple and reasonable structure, the gas is inflated or exhausted in two directions between the gas storage tank and the air spring by controlling the electric air pump device and the electromagnetic valve group, and the gas flows from the side with high air pressure to the side with low air pressure, so that the air pressure in the air spring is adjusted to adjust the height of the vehicle body; the energy consumption can be reduced by adopting an integrated closed-loop control mode, and meanwhile, higher system availability and better performance can be ensured, the cyclic use under various road conditions and temperatures is ensured, the frequent interaction with the atmosphere in the working process is prevented, and the moisture and other impurities in the atmosphere are prevented from entering the electromagnetic valve bank to influence the system work; because the system adopts highly integrated integration, the structure is compact, the whole volume and the weight are small, the light weight is achieved, and the energy conservation and the environmental protection are realized.
Drawings
FIG. 1 is a schematic diagram of the overall system of the present invention;
FIG. 2 is a schematic structural diagram of the product of the present invention;
FIG. 3 is a schematic diagram of the system inflation of the present invention;
FIG. 4 is a schematic diagram of the system exhaust of the present invention;
FIG. 5 is a schematic diagram of the air supply of the present invention with low system pressure;
FIG. 6 is a schematic diagram of the system according to the present invention showing moisture blowback after air supply;
in the figure: 11. an electric air pump device; 12. an ECU; 13. a pressure sensor; 14. an electromagnetic valve group; 15. a motor; 16. a connector assembly; 17. a valve port of the electromagnetic valve group; 18. a gas path interface; 19. an air filter interface; 20. an air charging and discharging electromagnetic valve; 21. a water discharge electromagnetic valve; 22. a throttle valve; 23. a compressor; 24. a one-way valve I; 25. a one-way valve II; 26. a one-way valve III; 27. a one-way valve IV; 28. a drying tank; 29. a common solenoid valve; 101. an internal pipeline I; 102. an internal pipe line II; 103. an internal line III; 104. an internal line IV; 201. a solenoid valve I; 202. a solenoid valve II; 203. a solenoid valve III; 204. and a solenoid valve IV.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that the terms "upper", "inner", "middle", "left", "right" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the corresponding elements may be changed or adjusted without substantial technical changes, and the scope of the present invention may be considered to be the scope of the present invention.
Referring to fig. 1-6, an integrated air suspension air supply system includes an integrated electric air pump device 11, an internal pipeline, an ECU12, a pressure sensor 13 and an electromagnetic valve group 14, the electric air pump device 11 is a driving unit and is driven by a motor 15, the electric air pump device 11 is connected to an air storage tank through an internal pipeline I101, the electric air pump device 11 is connected to the electromagnetic valve group 14 through an internal pipeline II102, the electromagnetic valve group 14 is connected to an air spring through an internal pipeline III103, the electric air pump device 11 is connected to the external atmosphere through an internal pipeline IV104, both the electric air pump device 11 and the electromagnetic valve group 14 are connected to an ECU12, the ECU12 controls the electric air pump device 11 and the electromagnetic valve group 14 to enable air to be inflated or exhausted between the air storage tank and the air spring in a two-way, so as to achieve closed-loop control, a connector 16 is disposed on the ECU12, an, The air path interface 18 and the air filter interface 19, the air filter interface 19 is connected with the air filter 19, the air filter 19 is arranged at the end part of the internal pipeline IV104 communicated with the external atmosphere, and the pressure sensor 13 is arranged at the end part of the pipeline communicated with the valve port 17 of the solenoid valve set.
In the embodiment, the system integration arrangement structure is simple and reasonable, the system is driven by the motor 15, the electric air pump device 11 and the electromagnetic valve group 14 are controlled to enable air to be inflated or exhausted between the air storage tank and the air spring in two directions, the air pressure flows from the side with high air pressure to the side with low air pressure, so that the air pressure in the air spring is adjusted to adjust the height of the vehicle body of the vehicle, the energy consumption can be reduced by adopting an integrated closed-loop control mode, and meanwhile, higher system availability and better performance can be ensured, the system can be ensured to be recycled under various road conditions and temperature conditions, frequent interaction with the atmosphere in the working process is prevented, and moisture and other impurities in the atmosphere are prevented from entering the electromagnetic valve group 14 to influence the system work; because the system adopts highly integrated integration, the structure is compact, the whole volume and the weight are small, the light weight is achieved, and the energy conservation and the environmental protection are realized.
Specifically, the motor 15 adopts frequency conversion control, the starting is more stable, the starting current is less, the compressor 23 of the electric air pump device 11 adopts a scroll compressor, the movable scroll disk and the static scroll disk with two bifunction equation molded lines are mutually meshed, and the scroll compressor has the advantages of stable operation, small vibration, small volume, low noise, long service life and continuous and stable air transmission. The air storage tank is used as an air source for lifting the vehicle body to ensure that the air storage tank has certain pressure. The air springs are respectively arranged on two sides of a front axle and two sides of a rear axle of the vehicle, and each air spring corresponds to one wheel. The electric air pump device 11 is connected with external atmosphere through the internal pipeline IV104, and when the air pressure of the air storage tank is insufficient, the ECU12 can control the electric air pump device 11 to supplement air for the air storage tank through the internal pipeline IV104, so that the reliability of closed-loop control can be improved better. The connector 16 on the ECU12 is used to connect the various units. The air filter 19 is used for filtering out impurities such as moisture in the outside atmosphere, preventing the impurities from entering the electromagnetic valve group 14, the electric air pump device 11 and the air storage tank, and ensuring the stability of the system operation. The pressure sensor 13 is used for acquiring a pressure signal in a common pipeline or an air spring or an air storage tank in the solenoid valve group 14 in real time, converting the pressure signal into an AD value and sending the AD value to the ECU12 for processing, the ECU12 is also used for judging whether the AD value is higher than a set high-pressure threshold value, and if the AD value is higher than the set high-pressure threshold value, performing system exhaust; and if the AD value is not higher than a set low-pressure threshold value, the system is charged.
Further, the electric air pump device comprises an air charging and discharging electromagnetic valve 20, a water discharging electromagnetic valve 21, a throttle valve 22, a compressor 23, a one-way valve I24, a one-way valve II25, a one-way valve III26, a one-way valve IV27, a drying tank 28 and a common electromagnetic valve 29, when the system is charged with air, the air in the air storage tank is charged with air through the air charging and discharging electromagnetic valve 20 and then reaches the air spring through the one-way valve I24, the compressor 23, the common electromagnetic valve 29 and the electromagnetic valve group 14; when the system exhausts, the air spring discharges air through the electromagnetic valve group 14, and the air passes through the common electromagnetic valve 29, the one-way valve IV27, the compressor 23, the drying tank 28, the one-way valve II25 and the air charging and discharging electromagnetic valve 20 to reach the air storage tank; when the pressure of the system is too low for air supplement, external atmosphere enters the air filter 19 in a filtering mode and reaches the air storage tank through the one-way valve III26, the compressor 23, the drying tank 28, the one-way valve II25 and the air charging and discharging electromagnetic valve 20 in sequence; and after the system is supplied with air, moisture blowback is carried out, the air charging and discharging electromagnetic valve 20 and the water discharging electromagnetic valve 21 are opened to form a blowback pipeline of the drying tank 28, the blowback pipeline passes through the air charging and discharging electromagnetic valve 20, the throttle valve 22, the drying tank 28 and the water discharging electromagnetic valve 21 and then is discharged to the atmosphere through the internal pipeline IV104, and the moisture in the drying tank 28 is discharged to the outside of the system, so that the regeneration of the drying tank 28 is realized.
In the present embodiment, when the system is inflated (the black bold line in fig. 3 is an inflation channel, and the arrow indicates a gas flow direction), the gas in the gas tank is inflated into one of the air springs, and the ECU12 controls the start of the compressor 23, wherein the compressor 23 is provided so that the gas can flow from the side with low gas pressure to the side with high gas pressure, or so that the gas can flow from the side with high gas pressure to the side with low gas pressure in an accelerated manner, the gas in the gas tank enters through the internal pipeline I101 and passes through the inflation/exhaust solenoid valve 20, the check valve I24, the compressor 23, the common solenoid valve 29, and the solenoid valve group 14 to reach one of the air springs, the check valve III26 and the check valve IV27 play a role in preventing backflow, and the drying tank 28 can perform a. When the system exhausts (black bold line in fig. 4 is an exhaust channel, an arrow is a gas flow direction), the air spring exhausts gas through the solenoid valve group 14, the gas reaches the gas storage tank through the common solenoid valve 29, the one-way valve IV27, the compressor 23, the drying tank 28, the one-way valve II25 and the charging and exhausting solenoid valve 20, and at the moment, the one-way valve I24 and the one-way valve III26 play a role in backflow prevention; the whole air charging and discharging is controlled in a closed loop mode and is controlled by the ECU 12. When the system pressure is too low for air supplement (black bold line in fig. 5 is an air supplement channel, arrow is a gas flow direction), external atmosphere enters through the air filter 19 in a filtering manner, sequentially passes through the check valve III26, the compressor 23, the drying tank 28, the check valve II25 and the air charging and discharging electromagnetic valve 20 to reach the air storage tank, is filtered through the air filter 19 firstly and then dried by the drying tank 28, so that moisture and impurities can be effectively prevented from entering the electromagnetic valve group 14, the electric air pump device 11 and the air storage tank, then the pressure sensor 13 collects the pressure value in real time, and when the pressure reaches a preset value, the whole air supplement process is completed; after the system is supplied with air, moisture blowback is performed (black bold line in fig. 6 is an air supply blowback channel, arrow is a gas flow direction), the air charging and discharging electromagnetic valve 20 and the water discharging electromagnetic valve 21 are opened to form a blowback pipeline of the drying tank 28, the moisture is discharged to the atmosphere through the internal pipeline IV104 after passing through the air charging and discharging electromagnetic valve 20, the throttle valve 22, the drying tank 28 and the water discharging electromagnetic valve 21, the moisture in the drying tank 28 is discharged to the outside of the system, the regeneration of the drying tank 28 is realized, the moisture blowback needs to be performed once again after being supplied with air, and the cyclic usability of the system is ensured.
Further, the ECU12 is also connected with a power supply, ignition, CAN communication, a height sensor, an acceleration sensor, a temperature sensor, a CDC solenoid valve and a relay.
In this embodiment, the power supply is used for supplying power; the ECU12 can receive an ignition signal for control; the ECU12 CAN receive vehicle speed information, door opening signals, braking signals and road surface information sent by CAN communication, the vehicle CAN be adjusted along with the speed, when the vehicle speed exceeds 100km/h, the height of the vehicle body CAN be automatically reduced, the system CAN identify the road surface according to the road surface information provided by the vehicle and perform self-adaptive adjustment, when the front of the vehicle passes through a concave and fluctuated road surface, the system CAN automatically increase the height of the vehicle body, the passing ability of the vehicle is increased, the chassis is prevented from being knocked and rubbed, and after the vehicle passes through the concave and fluctuated road surface, the vehicle body; of course, the system can also realize that the height of the vehicle body is kept constant regardless of whether the vehicle is unloaded or fully loaded. The height sensor can generate a height signal, the ECU12 receives the height signal and judges whether the height value of the vehicle body collected in real time is higher than a first set value, if the height value of the vehicle body is not higher than the first set value, whether the height value of the vehicle body is lower than a second set value is continuously judged, if the height value of the vehicle body is not lower than the second set value, the height of the vehicle body is kept unchanged, otherwise, corresponding height adjustment is carried out, the adverse condition of the road can be identified according to the variation and the duration of the height sensor, when the vehicle is identified to enter the adverse road surface, the height of the vehicle body automatically rises, and after the system identifies the adverse road surface, the vehicle body returns to the original height. The acceleration sensor can detect the vertical, longitudinal and transverse acceleration of the vehicle, and the ECU12 can receive the acceleration signal, so as to switch the mode operation of the vehicle, which is generally the asphalt road surface mode, the cement road surface mode and the construction site road surface mode, and of course, other modes such as deceleration strip mode, rapid acceleration mode, emergency braking mode, sharp turning mode, cement road mode, rough road mode, bumpy road mode, no-load mode, half-load mode, full-load mode, etc. can also achieve corresponding control. The temperature sensor can monitor the temperature of the compressor, and the ECU12 receives and controls the starting operation of the compressor, so that the usability of the system is ensured. The CDC solenoid valve is controlled to be opened or closed by the ECU12 so as to adjust the damping of the CDC damper, such as a hard mode, a soft mode, and a CDC mode, and thus, the mode switching can be performed well. The relay serves the purpose of controlling the drive.
Further, the solenoid valve group 14 comprises a solenoid valve I201, a solenoid valve II202, a solenoid valve III203 and a solenoid valve IV204, air outlets of the solenoid valve I201, the solenoid valve II202, the solenoid valve III203 and the solenoid valve IV204 are connected with the air spring through an internal pipeline III103, and the solenoid valve I201, the solenoid valve II202, the solenoid valve III203 and the solenoid valve IV204 are all controlled by an ECU 12.
In this embodiment, the ECU12 can well control the solenoid valve I201, the solenoid valve II202, the solenoid valve III203, and the solenoid valve IV204, and open or close according to the related control command of the ECU12, so as to adjust the air pressure in each air spring to adjust the height of the vehicle body, and thus, the switching between multiple different chassis height modes of the vehicle can be realized, and the off-road mode, the comfort mode, the standard mode, the sport mode, the user-defined mode, and the like can be realized according to the requirements of different vehicle types.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. An integrated air suspension air supply system, characterized by: the air pump device is a driving unit and driven by a motor, the electric air pump device is connected with an air storage tank through an internal pipeline I, the electric air pump device is connected with the electromagnetic valve group through an internal pipeline II, the electromagnetic valve group is connected with an air spring through an internal pipeline III, the electric air pump device is connected with external atmosphere through an internal pipeline IV, the electric air pump device and the electromagnetic valve group are both connected with the ECU, the ECU controls the electric air pump device and the electromagnetic valve group to enable air to be inflated or exhausted between the air storage tank and the air spring to flow in two directions so as to achieve closed-loop control, a connector is arranged on the ECU, and an electromagnetic valve group valve port, an air circuit interface and an air filter interface are arranged on the electromagnetic valve group, the air filter is connected with the air filter connector, the air filter is arranged at the end part of the inner pipeline IV communicated with the external atmosphere, and the pressure sensor is arranged at the end part of the pipeline communicated with the valve port of the solenoid valve group.
2. An integrated air suspension air supply system according to claim 1 wherein: the electric air pump device comprises an air charging and discharging electromagnetic valve, a water discharging electromagnetic valve, a throttle valve, a compressor, a one-way valve I, a one-way valve II, a one-way valve III, a one-way valve IV, a drying tank and a common electromagnetic valve, when the system is charged with air, the air in the air storage tank is charged with air through the air charging and discharging electromagnetic valve and then reaches the air spring through the one-way valve I, the compressor, the common electromagnetic valve and the electromagnetic valve group; when the system exhausts, the air spring discharges air through the electromagnetic valve group, and the air passes through the common electromagnetic valve, the one-way valve IV, the compressor, the drying tank, the one-way valve II and the air charging and discharging electromagnetic valve to reach the air storage tank; when the pressure of the system is too low for air supplement, external atmosphere enters through the filtration of the air filter and reaches the air storage tank through the one-way valve III, the compressor, the drying tank, the one-way valve II and the air charging and discharging electromagnetic valve in sequence; and after the system is supplied with air, moisture blowback is carried out, the air charging and discharging electromagnetic valve and the water discharging electromagnetic valve are opened to form a blowback pipeline of the drying tank, the blowback pipeline passes through the air charging and discharging electromagnetic valve, the throttle valve, the drying tank and the water discharging electromagnetic valve and then is discharged to the atmosphere through the internal pipeline IV, and the moisture in the drying tank is discharged to the outside of the system, so that the regeneration of the drying tank is realized.
3. An integrated air suspension air supply system according to claim 1 wherein: and the ECU is also in control connection with a power supply, an ignition device, a CAN communication device, a height sensor, an acceleration sensor, a temperature sensor, a CDC electromagnetic valve and a relay.
4. An integrated air suspension air supply system according to claim 1 wherein: the electromagnetic valve group comprises an electromagnetic valve I, an electromagnetic valve II, an electromagnetic valve III and an electromagnetic valve IV, air outlets of the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III and the electromagnetic valve IV are connected with the air spring through an internal pipeline III, and the electromagnetic valve I, the electromagnetic valve II, the electromagnetic valve III and the electromagnetic valve IV are controlled by an ECU.
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| CN201921398490.XU CN210363260U (en) | 2019-08-27 | 2019-08-27 | Integrated air suspension air supply system |
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| CN201921398490.XU CN210363260U (en) | 2019-08-27 | 2019-08-27 | Integrated air suspension air supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110481260A (en) * | 2019-08-27 | 2019-11-22 | 青岛纪玉捷成车辆技术有限公司 | A kind of integrated air suspension air supply system |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110481260A (en) * | 2019-08-27 | 2019-11-22 | 青岛纪玉捷成车辆技术有限公司 | A kind of integrated air suspension air supply system |
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Effective date of registration: 20200717 Address after: Room 501, unit 2, building 9, No.21, Nanchang Road, Sifang District, Qingdao City, Shandong Province Patentee after: Zhang Guangshi Address before: 266100 Jindun Gas Station, Dazhou Village Community, Qingwei Road, Chengyang District, Qingdao City, Shandong Province, 200 meters east Patentee before: Qingdao Jiyu Jiecheng Vehicle Technology Co.,Ltd. |
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Effective date of registration: 20200922 Address after: No.2-13, Tianrun Road, Wendeng Economic Development Zone, Weihai City, Shandong Province Patentee after: Tianrun intelligent control system integration Co., Ltd Address before: Room 501, unit 2, building 9, No.21, Nanchang Road, Sifang District, Qingdao City, Shandong Province Patentee before: Zhang Guangshi |