CN103383295A - All-dimensional secondary pressure monitoring device and method of static pressure supporting system - Google Patents
All-dimensional secondary pressure monitoring device and method of static pressure supporting system Download PDFInfo
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- CN103383295A CN103383295A CN2012101372534A CN201210137253A CN103383295A CN 103383295 A CN103383295 A CN 103383295A CN 2012101372534 A CN2012101372534 A CN 2012101372534A CN 201210137253 A CN201210137253 A CN 201210137253A CN 103383295 A CN103383295 A CN 103383295A
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- pressure
- support system
- hydrostatic support
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- static pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
- F16C32/0629—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion
- F16C32/064—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a liquid cushion, e.g. oil cushion the liquid being supplied under pressure
- F16C32/0644—Details of devices to control the supply of liquids to the bearings
Abstract
The invention discloses an all-dimensional secondary pressure monitoring device and method of a static pressure supporting system. The all-dimensional secondary pressure monitoring device and method of the static pressure supporting system can monitor pressure changes of the static pressure supporting system all-dimensionally in real time, and carry out early warning timely and effectively. According to the technical scheme, a monitoring element is connected with the static pressure cavity of a static pressure supporting system, pressure information of the static pressure cavity is measured directly, the pressure information is compared with a preset monitoring threshold value, alarm signals are sent timely and are displayed on a screen through PLC programming, and real-time monitoring of the pressure is carried out.
Description
Technical field
The present invention relates to watch-dog and method in the hydrostatic support system, relate in particular to the supervising device and the method that detect second pressure in the hydrostatic support system.
Background technology
The hydrostatic support system is by oil pump, flow controller and some auxiliary elements; As compositions such as filtrator, pressure transducer, accumulators, wherein the type of flow controller is more: film feedback formula, guiding valve reaction type, orifice restriction and capillary-compensated etc., but no matter be the flow controller of which kind of form, all need satisfy a common requirement: namely one is about the pressure ratio of 2:1 or claims the throttling ratio, the pressure ratio β of restriction front-end and back-end when generally just referring to zero load, the size of this numerical value is directly connected to the oil film rigidity of hydrostatic support.Below just take film feedback formula hydrostatic bearing as example, further set forth pressure ratio to the impact of oil film rigidity.Figure 1A and Figure 1B are the film feedback hydrostatic circuit.In Figure 1B, the static pressure support system is comprised of a plurality of pressure transducers (being illustrated as pressure transducer 10a, 10b, 10c, 10d), divider (being illustrated as divider 12a, 12b), hydrostatic bearing 14, main shaft 11, oil pump 15.
When axle journal is subject to radial load F and offset downward apart from e, bearing lower oil cavitie gap reduces, and pressure P 3 raises, upper oil cavitie gap increase, the P1 pressure decreased, the pressure differential Δ P=P3-P1 that upper lower oil cavitie forms, because oil pocket 1 and oil pocket 3 communicate with the upper and lower grease chamber of the membrane feedbacks the flow controller, one, the right respectively, thin film restrictor upper and lower grease chamber also produces same pressure differential, film is subject to the upwards power of effect, film raises up, and top throttle chink is reduced, and pressure P 1 descends thereupon.Following throttle chink increases, and pressure P 3 raises, and the pressure differential of hydrostatic bearing oil pocket 3 and oil pocket 1 increases thereupon as a result, and the axle journal trace is held up, and is stabilized on new position.So-called oil film rigidity is exactly the degree of the oil film opposing load F capacity of water around the spindle neck.For hydrostatic support, if its axle journal be subject to radial load F as the used time move down less apart from e, oil film rigidity is larger.The size of the size of oil film rigidity and throttling ratio beta has direct relation.
Can know from Fig. 2, the excessive too small of pressure ratio all can cause the displacement of axle journal to increase, thereby affects rotating accuracy, and integrating is exactly reduced stiffness.The fluid temperature influence, viscosity-modifying can change pressure ratio.Particularly outstanding is oil contamination (comprise when entrained air, fluid oxidation produce jelly, maintenance foul bring into etc.) stops up flow controller, and fluid can not form normal flowing, and its result burns out Zhi Chengfu exactly.
Past namely often is referred to as the method for simple control only at pressure oil inflow point setting pressure table, the pressure transducer of flow controller.Regularly maintenance downtime has just become to guarantee the only resource of static-pressure system safety.Such as changing fluid, changed filter core, clean flow controller, pipe blow-through, test oil film rigidity etc.Its shortcoming is: stop time is long, and operation easier is large, and accountability is strong.
Due to the existence of objective factor, flow controller just has the possibility that is blocked constantly, forms hard to guard against situation.Conventional simple pressure monitor means can not absolutely be protected supporting member.In case report to the police, its internal system components and parts are damaged, can only guarantee the hydrostatic support security of system by the measure of regular stopping production maintenance.
Summary of the invention
The object of the invention is to address the above problem, provide a kind of hydrostatic support system comprehensive second pressure supervising device, can be omnibearing the pressure of Real Time Monitoring hydrostatic support system change, carry out timely and effectively early warning.
Another object of the present invention is to provide a kind of hydrostatic support system comprehensive second pressure method for supervising, can be omnibearing the pressure of Real Time Monitoring hydrostatic support system change, carry out timely and effectively early warning.
Technical scheme of the present invention is: the present invention has disclosed the comprehensive second pressure supervising device of a kind of hydrostatic support system, comprises monitoring element, storer, detecting device, wherein:
Described monitoring element, the static pressure chamber of directly getting involved the hydrostatic support system directly records the force value in described static pressure chamber;
Described storer, the monitoring threshold value that storage is default;
Described detecting device connects described monitoring element and described storer, and force value and described default monitoring threshold with in the described static pressure chamber that records judge whether to produce early warning signal according to comparative result.
According to an embodiment of the comprehensive second pressure supervising device of hydrostatic support system of the present invention, described device also comprises:
Alarm connects described detecting device, receives the early warning signal that described detecting device sends and reports to the police.
According to an embodiment of the comprehensive second pressure supervising device of hydrostatic support system of the present invention, described device also comprises:
Display connects described detecting device, receives the early warning signal that described detecting device sends, the display alarm signal.
According to an embodiment of the comprehensive second pressure supervising device of hydrostatic support system of the present invention, described monitoring element comprises digital pressure sensor.
The present invention has also disclosed the comprehensive second pressure method for supervising of a kind of hydrostatic support system, comprising:
The monitoring element of directly getting involved the static pressure chamber of hydrostatic support system directly records the force value in described static pressure chamber;
With force value and the default monitoring threshold that records;
Judge whether to produce early warning signal according to comparative result.
According to an embodiment of the comprehensive second pressure method for supervising of hydrostatic support system of the present invention, the method comprises:
Receive early warning signal and report to the police.
According to an embodiment of the comprehensive second pressure method for supervising of hydrostatic support system of the present invention, described warning comprises audible alarm, display alarm.
According to an embodiment of the comprehensive second pressure method for supervising of hydrostatic support system of the present invention, described monitoring element is digital pressure sensor.
The present invention contrasts prior art following beneficial effect: the solution of the present invention is that the static pressure chamber in monitoring element and hydrostatic support system is connected, directly record the pressure information in the static pressure chamber, compare with default monitoring threshold value, in time send alerting signal, and be presented on screen by PLC program composition, carry out the Real Time Monitoring of pressure.The contrast prior art, device of the present invention can be omnibearing the pressure of Real Time Monitoring hydrostatic support system change, thereby carry out timely and effectively early warning, expanded the monitoring function in the hydrostatic support system, for ensureing that the static pressure element provides safely convenient, an effective approach, equipment of the present invention is simple, application is easy, applicability is strong, has satisfied the pressure monitor of various hydrostatic support system.
Description of drawings
Figure 1A and Figure 1B are the schematic diagram of the film feedback hydrostatic circuit of film feedback formula hydrostatic support system.
Fig. 2 is the graph of relation of film feedback hydrostatic circuit.
Fig. 3 is the structural drawing of the embodiment of the comprehensive second pressure supervising device of hydrostatic support system of the present invention.
Fig. 4 is the process flow diagram of the embodiment of the comprehensive second pressure method for supervising of hydrostatic support system of the present invention.
Fig. 5 is the schematic diagram of the application of the comprehensive second pressure supervising device of hydrostatic support system in film feedback formula hydrostatic support system of the present embodiment.
Fig. 6 be flow controller when being blocked displacement and the graph of a relation of pressure ratio.
Fig. 7 is that load causes displacement when static pressure cavity pressure in the same way descends and the value curve map of pressure ratio.
Fig. 8 is the schematic diagram of single channel simulation reduction voltage circuit.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
The embodiment of the comprehensive second pressure supervising device of hydrostatic support system
Fig. 3 shows the structure of the embodiment of the comprehensive second pressure supervising device of hydrostatic support system of the present invention.See also Fig. 3, the supervising device of the present embodiment comprises that monitoring element 20, storer 21, detecting device 22, alarm 23(are optional), display 24(is optional).
Monitoring element 20 and storer 21 all are connected to detecting device 22, and the output of detecting device 22 connects respectively alarm 23 and display 24.
The primary clustering of hydrostatic support system is oil pump, flow controller and auxiliary element etc.Monitoring element 20 is directly got involved the static pressure chamber of hydrostatic support system, directly records the force value in the static pressure chamber.The force value here just refers to second pressure, and so-called second pressure refers to the top hole pressure of flow controller.Monitoring element 20 can be pressure transducer, is for example digital pressure sensor.There is default monitoring threshold value in storer 21, in detecting device 22, the force value in the static pressure chamber that records and default monitoring threshold value compared, judge whether to produce early warning signal according to comparative result.
Alarm 23 is reported to the police receiving the early warning signal that detecting device 22 sends, and for example reports to the police in the mode of auditory tone cues.Display 24 is reported to the police receiving the early warning signal that detecting device 22 sends.
The hydrostatic support system avoids flexible participation (specifically refer to flow controller to the static pressure chamber this section) most, because it can reduce the performance index of hydrostatic support.These elements have: tensimeter, flexible pipe, accumulator and some do not meet pressure transducer of this system requirements etc.Use these elements to must be noted that pressure transducer medi-spring distortion meeting produces to the response speed of signal feedback the unfavorable factor that lags behind in secondary section.
Here to note the difference of permanent load and alternate load.Concerning permanent load: the uptake of spring can obtain in a short period of time the compensation of oil stream and tend to stable, namely is supported physical efficiency and sets up in a short period of time new position, so its kinematic accuracy is still normal.
And the situation of alternate load is just different, has moved certain distance under the instant heavy effect of supporting mass, and spring has absorbed energy when oppositely the static pressure chamber raises, the result that causes feedback pressure to lag behind and raise, this mistiming is longer, and response speed is just slower, and the oil film rigidity is also just poorer.
The application of the comprehensive second pressure supervising device of hydrostatic support system that Fig. 5 shows the present embodiment in film feedback formula hydrostatic support system, traditional monitor mode is simple pressure monitor, in use repeatedly make burn-out of bearing because flow controller stops up, therefore only can not meet the requirement of monitoring by simple pressure monitor.As shown in Figure 5, set up comprehensive second pressure monitoring on the hydrostatic bearing of frame end to end of equipment.
Hydrostatic support system in Fig. 5 comprises rear bearing 31, feedback film 32, front-end of spindle 33, front bearing 34, flow controller 35, rear-end of spindle 36, static pressure chamber 37, choke zone 38.P0 wherein is simple pressure entrance place, and P1～P8 is pressure measurement place of second pressure, and SD1～SD8 is pressure transducer.Frame totally 16 road static pressure chambeies end to end; every road all is provided with a pressure transducer as monitoring element; under this comprehensive slave mode; no matter which pressure drop (over burdening that blocking causes causes) is to alarm set point; the shutdown of can reporting to the police, and control correctly by PLC its position is presented on function screen.
In storer default monitoring threshold value determine must consider two problems, the one, flow controller is blocked, the warning of in time posting a letter that descends of static pressure cavity pressure; The 2nd, the warning of posting a letter even the cavity pressure of static pressure in the same way that over burdening causes descends, and the cavity pressure of static pressure in the same way that normal load causes descends and can not post a letter.
Below determining of the monitoring threshold value that is blocked of flow controller.When the restriction of flow controller is blocked, normal measurement just can not get guaranteeing, the static pressure cavity pressure will sharply descend, at this moment the pressure reduction of the former stage pressure of flow controller and second pressure is very large, pressure ratio β value will exceed the normal region, and at this moment the supporting mass displacement increases, until Zhi Chengfu grazing and damaging.Can determine that according to the graph of a relation of Fig. 6 it posts a letter a little.
Formula β-pressure ratio
In: Δ P-second pressure
The former stage pressure of P-
And the flow controller blocking, always step-down of second pressure is so the value of posting a letter is got the smallest limit Δ Pmin of second pressure, namely
Δ Pmin is exactly the minimum value of the second pressure of system, and less than this value, bearing just has impaired possibility.Below that load causes determining of monitoring threshold value that static pressure cavity pressure in the same way descends.
Load has normal and improper dividing.That so-called normal load just refers to is that the hydrostatic support oil film can bear, can not cause the load that static pressure cavity pressure Δ P significantly changes.Otherwise be exactly over burdening.
Due to the effect that is subjected to load F power, the oil sealing gap in static pressure chamber will increase in the same way with it, and pressure descends thereupon.When Pressure Drop surpasses certain certain value, monitor the warning of posting a letter immediately.Determining that this is posted a letter a little can only be by testing just system and can drawing, because the related data of each system is different.
Example: numerical control crankshaft grinder shown in Figure 5 is frame hydrostatic bearing definite value test data end to end.
For main shaft, amount of displacement is to weigh a sign of spindle rotation accuracy.The processing object of system shown in Figure 5 is bent axle, and precision is higher.By the situation of its normal process load, with, the reverse pressure differential 4bar in static pressure chamber, calculate that by above-mentioned table its displacement is less than 3 μ.By the circularity requirement of processing work, frame main shaft permission maximum displacement is 10 μ end to end, and static pressure cavity pressure Δ Pmin is 13bar in the same way.Therefore, value is answered 〉=13bar, its running accuracy of guarantee.
Demonstration by above two aspects has obtained two Δ Pmin values, and 11.3bar and 13bar. are in order further to get their relation clear.We confirm a value that can satisfy this system requirements with graphic interpretation.See Fig. 7, left vertical coordinate is pressure ratio β, gets normal region 1.5 ~ 3, by calculating Δ P value scope 11.3 ~ 22.7 (bar); Right vertical coordinate is supporting mass displacement e, obtains by test: when displacement 10 μ, the static pressure cavity pressure drops to 13bar by 19bar in the same way, because accuracy requirement 10 μ of workpiece to be machined are maximal values, so 13bar has just become to guarantee the minimum value of precision.
This shows, just in time between 11.3 and 22.7, it can satisfy accuracy requirement to 13bar, has satisfied again the requirement of normal pressure ratio simultaneously.
When flow controller was blocked, acting on the pressure that is supported on body will descend, as long as but when dropping to 13bar, the relay shutdown of can reporting to the police.When load surpassed 3000N, the static pressure cavity pressure also can drop to 13bar in the same way, the relay shutdown of can reporting to the police equally.This has not only protected Zhi Chengfu to exempt from damage, and has guaranteed the kinematic accuracy of supporting mass, has also played the effect of protecting other mechanical component safety simultaneously.The new method that an overload protection in this sense, has been arranged again.
Before adjusting the pressure transducer value of posting a letter, must drop to alarm set point to second pressure.Can realize by the simulation voltage drop method, adopt the form of single channel adjustment to operate one by one.
In Fig. 8, specific purpose tool 400 is comprised of surplus valve, tensimeter and the oil-holder of a low discharge.Connect by fast interface and system second pressure oil circuit, the force value that reflects on according to tensimeter is adjusted surplus valve, thereby obtains the needed simulation pressure of posting a letter.After corresponding with it relay adjustment is complete, only need takes out rapid-acting coupling and get final product.The number of times that carries out is the same with the amount number in static pressure chamber.
This method is accurate, convenient, former stage pressure that need not change flow controller just can carry out.Certainly this is not unique method, can be according to individual's method operation, as long as achieve the goal.
In general static-pressure system, all be provided with simple pressure monitor and be provided with the pressure reduction monitoring on filtrator.The purpose of this form is just for anti-locking system failure of oil feed and underfed.
Because static pressure chamber monitoring figure place is more, signal source also increases thereupon.If conventional equipment only needs all signalling contacts are serially connected in electric control loop to get final product.If program control or numerical control device, also can be by orientation being simultaneously displayed on screen in shutdown of PLC program composition with pressure signal.This brings great convenience to maintenance again.
For the system that the relay monitoring contact was arranged originally, only need all signalling contacts and original contact are together in series and just can realize.
The embodiment of the comprehensive second pressure method for supervising of hydrostatic support system
On the basis based on the above-mentioned comprehensive second pressure supervising device of hydrostatic support system, the present invention also shows the method for supervising of realizing by this device.See also Fig. 4, the below is the detailed description to each step of the method for the present embodiment.
Step S10: the monitoring element of directly getting involved the static pressure chamber of hydrostatic support system directly records the force value in described static pressure chamber.
Monitoring element can be pressure transducer.
Step S12: with force value and the default monitoring threshold that records.
Step S14: judge whether to produce early warning signal according to comparative result.
Step S16: receive early warning signal and report to the police.
This step is optional step, reports to the police to comprise audible alarm, display alarm.
The device that relevant the method relies on is described in detail in a upper embodiment, repeats no more herein.
Above-described embodiment is to provide to those of ordinary skills and realizes and use of the present invention; those of ordinary skills can be in the situation that do not break away from invention thought of the present invention; above-described embodiment is made various modifications or variation; thereby protection scope of the present invention do not limit by above-described embodiment, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (8)
1. the comprehensive second pressure supervising device of hydrostatic support system, comprise monitoring element, storer, detecting device, wherein:
Described monitoring element, the static pressure chamber of directly getting involved the hydrostatic support system directly records the force value in described static pressure chamber;
Described storer, the monitoring threshold value that storage is default;
Described detecting device connects described monitoring element and described storer, and force value and described default monitoring threshold with in the described static pressure chamber that records judge whether to produce early warning signal according to comparative result.
2. the comprehensive second pressure supervising device of hydrostatic support system according to claim 1, is characterized in that, described device also comprises:
Alarm connects described detecting device, receives the early warning signal that described detecting device sends and reports to the police.
3. the comprehensive second pressure supervising device of hydrostatic support system according to claim 1, is characterized in that, described device also comprises:
Display connects described detecting device, receives the early warning signal that described detecting device sends, the display alarm signal.
4. the comprehensive second pressure supervising device of hydrostatic support system according to claim 1, is characterized in that, described monitoring element comprises digital pressure sensor.
5. comprehensive second pressure method for supervising of hydrostatic support system comprises:
The monitoring element of directly getting involved the static pressure chamber of hydrostatic support system directly records the force value in described static pressure chamber;
With force value and the default monitoring threshold that records;
Judge whether to produce early warning signal according to comparative result.
6. the comprehensive second pressure method for supervising of hydrostatic support system according to claim 5, is characterized in that, the method comprises:
Receive early warning signal and report to the police.
7. the comprehensive second pressure method for supervising of hydrostatic support system according to claim 6, is characterized in that, described warning comprises audible alarm, display alarm.
8. the comprehensive second pressure method for supervising of hydrostatic support system according to claim 5, is characterized in that, described monitoring element is digital pressure sensor.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210137253.4A CN103383295B (en) | 2012-05-03 | 2012-05-03 | The comprehensive second pressure supervising device of hydrostatic support system and method |
| PCT/CN2012/079761 WO2013163851A1 (en) | 2012-05-03 | 2012-08-07 | Omnidirectional secondary pressure monitoring device and method for static supporting system |
| DE212012000270.7U DE212012000270U1 (en) | 2012-05-03 | 2012-08-07 | Device for complete monitoring of the secondary pressure in a hydrostatic support system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210137253.4A CN103383295B (en) | 2012-05-03 | 2012-05-03 | The comprehensive second pressure supervising device of hydrostatic support system and method |
Publications (2)
| Publication Number | Publication Date |
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| CN103383295A true CN103383295A (en) | 2013-11-06 |
| CN103383295B CN103383295B (en) | 2015-10-21 |
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| CN201210137253.4A Active CN103383295B (en) | 2012-05-03 | 2012-05-03 | The comprehensive second pressure supervising device of hydrostatic support system and method |
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| Country | Link |
|---|---|
| CN (1) | CN103383295B (en) |
| DE (1) | DE212012000270U1 (en) |
| WO (1) | WO2013163851A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106382302A (en) * | 2016-11-24 | 2017-02-08 | 天津职业技术师范大学 | Static pressure bearing capable of realizing online pressure fault detection and rapid maintenance |
| CN108971528A (en) * | 2018-07-23 | 2018-12-11 | 安徽工程大学 | A kind of machine tool chief axis utilizes the self centering method and device thereof of sliding bearing |
| CN109139695A (en) * | 2017-06-15 | 2019-01-04 | 重庆西门雷森精密装备制造研究院有限公司 | A kind of filmatic bearing novel thin film throttling set |
| CN111852454A (en) * | 2020-06-18 | 2020-10-30 | 四川恒铭泽石油天然气工程有限公司 | Channel switching method of automatic throttling pressure control system |
| CN112727915A (en) * | 2020-12-29 | 2021-04-30 | 上海嵘熵动力科技有限公司 | Dynamic pressure air suspension bearing protection device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI760810B (en) * | 2020-08-07 | 2022-04-11 | 國立清華大學 | Dual membrane restrictor |
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- 2012-05-03 CN CN201210137253.4A patent/CN103383295B/en active Active
- 2012-08-07 DE DE212012000270.7U patent/DE212012000270U1/en not_active Expired - Lifetime
- 2012-08-07 WO PCT/CN2012/079761 patent/WO2013163851A1/en active Application Filing
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106382302A (en) * | 2016-11-24 | 2017-02-08 | 天津职业技术师范大学 | Static pressure bearing capable of realizing online pressure fault detection and rapid maintenance |
| CN109139695A (en) * | 2017-06-15 | 2019-01-04 | 重庆西门雷森精密装备制造研究院有限公司 | A kind of filmatic bearing novel thin film throttling set |
| CN108971528A (en) * | 2018-07-23 | 2018-12-11 | 安徽工程大学 | A kind of machine tool chief axis utilizes the self centering method and device thereof of sliding bearing |
| CN108971528B (en) * | 2018-07-23 | 2021-04-16 | 安徽工程大学 | Method and device for automatically centering machine tool spindle by using sliding bearing |
| CN111852454A (en) * | 2020-06-18 | 2020-10-30 | 四川恒铭泽石油天然气工程有限公司 | Channel switching method of automatic throttling pressure control system |
| CN111852454B (en) * | 2020-06-18 | 2023-05-23 | 四川恒铭泽石油天然气工程有限公司 | Channel switching method of automatic throttle control system |
| CN112727915A (en) * | 2020-12-29 | 2021-04-30 | 上海嵘熵动力科技有限公司 | Dynamic pressure air suspension bearing protection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103383295B (en) | 2015-10-21 |
| DE212012000270U1 (en) | 2014-12-04 |
| WO2013163851A1 (en) | 2013-11-07 |
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Address after: Anting Jiading District Town, Shanghai City Road No. 123 in 201805 Patentee after: SAIC VOLKSWAGEN AUTOMOTIVE COMPANY LIMITED Address before: Anting Jiading District Town, Shanghai City Road No. 123 in 201805 Patentee before: Dazhang Automobile Co., Ltd., Shanghai |