CN103383295B - The comprehensive second pressure supervising device of hydrostatic support system and method - Google Patents
The comprehensive second pressure supervising device of hydrostatic support system and method Download PDFInfo
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- CN103383295B CN103383295B CN201210137253.4A CN201210137253A CN103383295B CN 103383295 B CN103383295 B CN 103383295B CN 201210137253 A CN201210137253 A CN 201210137253A CN 103383295 B CN103383295 B CN 103383295B
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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
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses the comprehensive second pressure supervising device of hydrostatic support system and method, can omnibearing real-time monitoring hydrostatic support system pressure change, carry out early warning timely and effectively.Its technical scheme is: monitoring element is connected with the static pressure chamber in hydrostatic support system by the present invention, directly record the pressure information in static pressure chamber, compare with the monitoring threshold value preset, send alerting signal in time, and be presented on screen by PLC program composition, carry out the real-time monitoring of pressure.
Description
Technical field
The present invention relates to the watch-dog in hydrostatic support system and method, particularly relate to the supervising device and method that detect second pressure in hydrostatic support system.
Background technology
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 be no matter the flow controller of which kind of form, all need a satisfied common requirement: namely one is about the pressure ratio of 2:1 or claims Throttling ratio, generally just refer to the pressure ratio β of restriction front-end and back-end during zero load, the size of this numerical value is directly connected to the oil film rigidity of hydrostatic support.Below just for film feedback formula hydrostatic bearing, set forth pressure ratio further to the impact of oil film rigidity.Figure 1A and Figure 1B is film feedback hydrostatic circuit.In fig. ib, static pressure support system is made up of multiple pressure transducer (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 offsets downward distance e, bearing lower oil cavitie gap reduces, and pressure P 3 raises, and upper oil cavitie gap increases, P1 pressure reduces, the pressure differential Δ P=P3-P1 that upper lower oil cavitie is formed, 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, the upper and lower grease chamber of thin film restrictor also produces same pressure differential, film is subject to the power upwards acted on, film raises up, and throttle chink is above reduced, and pressure P 1 declines thereupon.Throttle chink below increases, and pressure P 3 raises, and the pressure differential of result hydrostatic bearing oil pocket 3 and oil pocket 1 increases thereupon, is held up by axle journal trace, 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 spindle neck.For hydrostatic support, if the distance e moved down when its axle journal is subject to radial load F effect is less, then oil film rigidity is larger.The size of oil film rigidity and the size of throttling ratio beta have direct relation.
Can know from Fig. 2, the excessive too small of pressure ratio all can cause the displacement of axle journal to increase, thus affects rotating accuracy, and integrating is exactly reduced stiffness.Fluid temperature influence, viscosity-modifying can change pressure ratio.Particularly outstanding is that oil contamination (comprising foul when being mixed into air, fluid oxidation generation jelly, maintenance to bring into) makes flow controller block, and fluid can not form normal flowing, and its result burns out Zhi Chengfu exactly.
Past only at pressure oil inflow point setting pressure table, the pressure transducer of flow controller, is namely often referred to as the method for simple control.Regular maintenance downtime has just become the only resource ensureing static-pressure system safety.Such as change fluid, change filtration core, cleaning 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 be blocked constantly, forms hard to guard against situation.Conventional simple pressure monitor means absolutely can not protect supporting member.Once report to the police, its internal system components and parts are damaged, and the measure can only maintained by periodic shut down ensures the safety of hydrostatic support system.
Summary of the invention
The object of the invention is to solve the problem, provide the comprehensive second pressure supervising device of a kind of hydrostatic support system, can omnibearing real-time monitoring hydrostatic support system pressure change, carry out early warning timely and effectively.
Another object of the present invention is to provide the comprehensive second pressure method for supervising of a kind of hydrostatic support system, can omnibearing real-time monitoring hydrostatic support system pressure change, carry out early warning timely and effectively.
Technical scheme of the present invention is: present invention is disclosed the comprehensive second pressure supervising device of a kind of hydrostatic support system, comprise monitoring element, storer, detecting device, wherein:
Described monitoring element, directly gets involved the static pressure chamber of hydrostatic support system, directly records the force value in described static pressure chamber;
Described storer, stores the monitoring threshold value preset;
Described detecting device, connects described monitoring element and described storer, the force value in the described static pressure chamber recorded is compared with described default monitoring threshold value, judges whether to produce early warning signal according to comparative result.
One embodiment of the comprehensive second pressure supervising device of hydrostatic support system according to the present invention, described device also comprises:
Alarm, connects described detecting device, receives early warning signal that described detecting device sends and reports to the police.
One embodiment of the comprehensive second pressure supervising device of hydrostatic support system according to the present invention, described device also comprises:
Display, connects described detecting device, receives the early warning signal that described detecting device sends, display alarm signal.
One embodiment of the comprehensive second pressure supervising device of hydrostatic support system according to the present invention, described monitoring element comprises digital pressure sensor.
Present invention further teaches the comprehensive second pressure method for supervising of a kind of hydrostatic support system, comprising:
The monitoring element in the static pressure chamber of direct intervention hydrostatic support system directly records the force value in described static pressure chamber;
The force value recorded is compared with the monitoring threshold value preset;
Judge whether to produce early warning signal according to comparative result.
One embodiment of the comprehensive second pressure method for supervising of hydrostatic support system according to the present invention, the method comprises:
Receive early warning signal and report to the police.
One embodiment of the comprehensive second pressure method for supervising of hydrostatic support system according to the present invention, described warning comprises audible alarm, display alarm.
One embodiment of the comprehensive second pressure method for supervising of hydrostatic support system according to 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 connected with the static pressure chamber in hydrostatic support system by monitoring element, directly record the pressure information in static pressure chamber, compare with the monitoring threshold value preset, send alerting signal in time, and be presented on screen by PLC program composition, carry out the real-time monitoring of pressure.Contrast prior art, device of the present invention can omnibearing real-time monitoring hydrostatic support system pressure change, thus carry out early warning timely and effectively, extend the monitoring function in hydrostatic support system, for ensureing that static pressure element provides safely convenient, an effective approach, equipment of the present invention is simple, it is easy to apply, applicability strong, meets the pressure monitor of various hydrostatic support system.
Accompanying drawing explanation
Figure 1A and Figure 1B is 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 is the displacement of flow controller when being blocked and the graph of a relation of pressure ratio.
Fig. 7 is the displacement of load when causing static pressure cavity pressure in the same way to decline and the valued curve figure of pressure ratio.
Fig. 8 is the schematic diagram of single analog reduction voltage circuit.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
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.Refer to Fig. 3, the supervising device of the present embodiment comprises monitoring element 20, storer 21, detecting device 22, alarm 23(are optional), display 24(is optional).
Monitoring element 20 and storer 21 are all connected to detecting device 22, and the output of detecting device 22 connects alarm 23 and display 24 respectively.
The primary clustering of hydrostatic support system is oil pump, flow controller and auxiliary element etc.Monitoring element 20 directly gets involved the static pressure chamber of hydrostatic support system, directly records the force value in static pressure chamber.Here force value just refers to second pressure, so-called second pressure, refers to the top hole pressure of flow controller.Monitoring element 20 can be pressure transducer, such as, be digital pressure sensor.In storer 21, there is default monitoring threshold value, in detecting device 22, the force value in the static pressure chamber recorded 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, such as, report 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.
Hydrostatic support system avoids flexible participation (specifically referring to flow controller to this section of static pressure chamber) most, because it can reduce the performance index of hydrostatic support.These elements have: tensimeter, flexible pipe, accumulator and some do not meet the pressure transducer etc. of this system requirements.In secondary section, using these elements must be noted that, in pressure transducer, camber of spring can produce delayed unfavorable factor to the response speed of signal feedback.
Here the difference of permanent load and alternate load will be noted.Concerning permanent load: the uptake of spring can obtain the compensation of oil stream in a short period of time and tend to stable, is namely set up new position in a short period of time by supporting physical efficiency, so its kinematic accuracy is still normal.
And the situation of alternate load is just different, move certain distance under the instant heavy effect of supporting mass, while reverse static pressure chamber raises, spring absorbs energy, cause the result of the delayed rising of feedback pressure, this mistiming is longer, and response speed is slower, and oil film rigidity is also poorer.
Fig. 5 shows the application of the comprehensive second pressure supervising device of hydrostatic support system in film feedback formula hydrostatic support system of the present embodiment, traditional monitor mode is simple pressure monitor, in use repeatedly because flow controller blocking makes burn-out of bearing, therefore only can not meet the requirement of monitoring by simple pressure monitor.As shown in Figure 5, the hydrostatic bearing of frame end to end of equipment has been set up comprehensive second pressure monitoring.
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 is wherein simple pressure entrance place, and P1 ~ P8 is pressure measurement place of second pressure, and SD1 ~ SD8 is pressure transducer.Static pressure chamber, Jia Gong 16 road end to end; every road is all 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; can to report to the police shutdown, and to control correctly its position to be presented on function screen by PLC.
In storer, the determination of default monitoring threshold value must consider two problems, and one is that flow controller is blocked, and static pressure cavity pressure declines can transmit warning in time; Even if two is that the cavity pressure of static pressure in the same way that over burdening causes declines and can transmit warning, and the cavity pressure of static pressure in the same way that normal load causes declines and can not transmit.
It is below the determination of the monitoring threshold value that flow controller is blocked.When the restriction of flow controller is blocked, normal measurement just can not be guaranteed, and static pressure cavity pressure will sharply decline, at this moment the pressure reduction of the simple pressure of flow controller and second pressure is very large, then pressure ratio β value will exceed normal region, and at this moment supporting mass displacement increases, until Zhi Chengfu grazing and damaging.Can determine that it transmits a little according to the graph of a relation of Fig. 6.
Formula β-pressure ratio
In: Δ P-second pressure
The simple pressure of P-
And flow controller blocking, second pressure always step-down, so the smallest limit Δ Pmin transmitting that value gets second pressure, namely
Δ Pmin is exactly the minimum value of the second pressure of system, is less than this value, and bearing just has impaired possibility.It is below the determination of the monitoring threshold value that load causes static pressure cavity pressure in the same way to decline.
Load has normal and improper dividing.So-called normal load just refers to that hydrostatic support oil film can bear, that static pressure cavity pressure Δ P can not be caused significantly to change load.Otherwise be exactly over burdening.
Due to the effect by load F power, the oil sealing gap in static pressure chamber will increase in the same way with it, and pressure declines thereupon.When Pressure Drop exceedes certain certain value, monitoring transmits warning immediately.Determine that this transmits a little can only just can draw by testing system, because the related data of each system is different.
Example: the numerical control crankshaft grinder shown in Fig. 5 is frame hydrostatic bearing definite value test data end to end.
For main shaft, amount of displacement weighs a mark of spindle rotation accuracy.The processing object of the system shown in Fig. 5 is bent axle, and precision is higher.By the situation of its normal process load, by above-mentioned table, pressure differential 4bar that is same, oppositely static pressure chamber, calculates that its displacement is less than 3 μ.By the circularity requirement of processing work, head tailstock spindle allows maximum displacement to be 10 μ, then static pressure cavity pressure Δ Pmin is 13bar in the same way.Therefore, value answers >=13bar, its running accuracy of guarantee.
Obtain two Δ Pmin values by the demonstration of above two aspects, 11.3bar and 13bar. is in order to get their relation further clear.We confirm a value that can meet this system requirements by 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, is obtained by test: as displacement 10 μ, static pressure cavity pressure drops to 13bar by 19bar in the same way, because accuracy requirement 10 μ of workpiece to be machined is maximal value, so 13bar has just become the minimum value ensureing precision.
As can be seen here, 13bar is just in time between 11.3 and 22.7, and it can meet accuracy requirement, meets again the requirement of normal pressure ratio simultaneously.
Relay when flow controller is blocked, acts on and will be declined by the pressure on supporting mass, as long as but when dropping to 13bar, can be reported to the police shutdown.When load is more than 3000N, static pressure cavity pressure also can drop to 13bar in the same way, and relay can be reported to the police shutdown equally.This not only protects Zhi Chengfu and exempts from damage, and ensure that the kinematic accuracy of supporting mass, also serves the effect of other mechanical component safety of protection simultaneously.In this sense, the new method of an overload protection has been had again.
Before adjustment pressure transducer transmits value, second pressure must be dropped to alarm set point.Can be realized by simulation voltage drop method, adopt the form of single channel adjustment to operate one by one.
In Fig. 8, specific purpose tool 400 is made up of the surplus valve of a low discharge, tensimeter and oil-holder.Connected by fast interface and system second pressure oil circuit, according to the force value adjustment surplus valve that tensimeter reflects, thus obtain required simulation and transmit pressure.After treating relay adjustment corresponding with it, only rapid-acting coupling need be taken out.The number of times carried out is the same with the amount number in static pressure chamber.
This method accurately, convenient, do not need the simple pressure changing flow controller just can carry out.Certainly this is not unique method, can operate, as long as achieve the goal according to the method for individual.
In general static-pressure system, be all provided with simple pressure monitor and be provided with pressure reduction monitoring on the filter.The object of this form is just in order to 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 all signalling contacts need be serially connected in electric control loop.If program control or numerical control device, also by PLC program composition by the orientation of pressure signal shut down being simultaneously displayed on screen.This brings great convenience to maintenance again.
For the system originally having relay monitoring contact, only all signalling contacts and original contact series need be got up and just can realize.
the embodiment of the comprehensive second pressure method for supervising of hydrostatic support system
On the basis based on the comprehensive second pressure supervising device of above-mentioned hydrostatic support system, the present invention also show the method for supervising realized by this device.Refer to Fig. 4, here is the detailed description of each step of method to the present embodiment.
Step S10: directly the monitoring element in the static pressure chamber of intervention hydrostatic support system directly records the force value in described static pressure chamber.
Monitoring element can be pressure transducer.
Step S12: the force value recorded is compared with the monitoring threshold value preset.
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 and comprises audible alarm, display alarm.
About the device that the method relies on, describe in detail in a upper embodiment, repeat no more herein.
Above-described embodiment is available to those of ordinary skill in the art to realize and uses of the present invention; those of ordinary skill in the art can be without departing from the present invention in the case of the inventive idea; various modifications or change are made to above-described embodiment; thus protection scope of the present invention not limit by above-described embodiment, and should be the maximum magnitude meeting the inventive features that claims are mentioned.
Claims (8)
1. the comprehensive second pressure supervising device of hydrostatic support system, comprises monitoring element, storer, detecting device, wherein:
Described monitoring element directly gets involved the static pressure chamber of hydrostatic support system, and each static pressure chamber, road is all provided with a monitoring element; Described monitoring element directly records the force value in described static pressure chamber, and described force value is the second pressure of the top hole pressure for representing flow controller in described hydrostatic support system, i.e. top hole pressure;
Described storer, stores the monitoring threshold value preset;
Described detecting device; connect described monitoring element and described storer; the monitoring threshold value that force value in the described static pressure chamber recorded by described monitoring element is preset with described storer is compared; judge whether to produce early warning signal according to comparative result, shut down for realizing reporting to the police according to described early warning signal and determine warning position.
2. the comprehensive second pressure supervising device of hydrostatic support system according to claim 1, it is characterized in that, described device also comprises:
Alarm, connects described detecting device, receives 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, it is characterized in that, described device also comprises:
Display, connects described detecting device, receives the early warning signal that described detecting device sends, display alarm signal.
4. the comprehensive second pressure supervising device of hydrostatic support system according to claim 1, it is characterized in that, described monitoring element comprises digital pressure sensor.
5. the comprehensive second pressure method for supervising of hydrostatic support system, comprising:
The monitoring element in the static pressure chamber of direct intervention hydrostatic support system directly records the force value in described static pressure chamber, and each static pressure chamber, road is all provided with a monitoring element, described force value is the second pressure of the top hole pressure for representing flow controller in described hydrostatic support system, i.e. top hole pressure;
The force value recorded is compared with the monitoring threshold value preset;
Judge whether to produce early warning signal according to comparative result, shut down for realizing reporting to the police according to described early warning signal and determine warning position.
6. the comprehensive second pressure method for supervising of hydrostatic support system according to claim 5, it 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, it 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, it 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 CN103383295A (en) | 2013-11-06 |
| CN103383295B true 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) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106382302B (en) * | 2016-11-24 | 2019-07-12 | 天津职业技术师范大学 | It is a kind of can on-line checking pressure fault and rapid-maintenance hydrostatic 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 |
| 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 |
| 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 |
| TWI760810B (en) * | 2020-08-07 | 2022-04-11 | 國立清華大學 | Dual membrane restrictor |
| 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 |
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| US3871233A (en) * | 1973-09-17 | 1975-03-18 | Standun | Fluid pressure monitoring device |
| CN2614287Y (en) * | 2001-12-28 | 2004-05-05 | 哈尔滨电机厂有限责任公司 | A hydrostatic bearing variation constant-current oil supply system |
| CN101776507A (en) * | 2009-12-29 | 2010-07-14 | 威海华东数控股份有限公司 | Pressure sensor detecting device |
| CN101886580A (en) * | 2009-03-27 | 2010-11-17 | 通用汽车环球科技运作公司 | Produce the method and system of engine components diagnostic signal with in-cylinder pressure sensor |
| CN101900163A (en) * | 2010-07-14 | 2010-12-01 | 武汉重型机床集团有限公司 | Frequency-conversion constant-current hydrostatic bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1220039C (en) * | 2002-12-27 | 2005-09-21 | 中国科学院力学研究所 | Measuring method and its device for deep water pressure |
| US8672875B2 (en) * | 2003-12-31 | 2014-03-18 | Carefusion 303, Inc. | Medication safety enhancement for secondary infusion |
| CN1736540A (en) * | 2004-08-17 | 2006-02-22 | 王惠生 | Apparatus for monitoring blockage status of mechanical filter |
| JP2013517481A (en) * | 2010-01-19 | 2013-05-16 | グリーンズ エナジー グループ， エルエルシー | Hydrostatic pressure test system and method |
-
2012
- 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
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3871233A (en) * | 1973-09-17 | 1975-03-18 | Standun | Fluid pressure monitoring device |
| CN2614287Y (en) * | 2001-12-28 | 2004-05-05 | 哈尔滨电机厂有限责任公司 | A hydrostatic bearing variation constant-current oil supply system |
| CN101886580A (en) * | 2009-03-27 | 2010-11-17 | 通用汽车环球科技运作公司 | Produce the method and system of engine components diagnostic signal with in-cylinder pressure sensor |
| CN101776507A (en) * | 2009-12-29 | 2010-07-14 | 威海华东数控股份有限公司 | Pressure sensor detecting device |
| CN101900163A (en) * | 2010-07-14 | 2010-12-01 | 武汉重型机床集团有限公司 | Frequency-conversion constant-current hydrostatic bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103383295A (en) | 2013-11-06 |
| DE212012000270U1 (en) | 2014-12-04 |
| WO2013163851A1 (en) | 2013-11-07 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
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 |