CN206682080U - A kind of low energy consumption environment protection electrohydraulic servo valve testboard - Google Patents
A kind of low energy consumption environment protection electrohydraulic servo valve testboard Download PDFInfo
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- CN206682080U CN206682080U CN201621382923.9U CN201621382923U CN206682080U CN 206682080 U CN206682080 U CN 206682080U CN 201621382923 U CN201621382923 U CN 201621382923U CN 206682080 U CN206682080 U CN 206682080U
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Abstract
The utility model provides a kind of low energy consumption environment protection electrohydraulic servo valve testboard, including：Operating desk, BOR Bunker of Redelivery interface is responsible for by oil-feed, oil-feed supervisor's other end enters oil inlet pipe with first, second and is connected；Large and small valve seat, on operating desk, first, second servo valve is set respectively, oil inlet enters oil inlet pipe with first, second respectively and is connected；First, second oil returning branch pipe, it is connected respectively with first, second servo valve oil return opening；First, second circulation pipe, connected respectively with the loading interfaces of first, second servo valve two first, second；Oil return is responsible for, and one end is connected respectively with first, second oil returning branch pipe, other end BOR Bunker of Redelivery liquid return hole；Gas control relief valve, in parallel with the 3rd pneumatic ball valve, leakage fluid dram runs in liquid pump；Discharging tube, one end are connected with positive displacement pump, other end BOR Bunker of Redelivery leakage fluid dram.The testing bench structure is reasonable in design, work safety, it is reliable, using being simple and convenient to operate；There are good maintainability, visuality, interchangeability and testability.
Description
Technical field
The utility model belongs to electrohydraulic servo valve functional test field, is watched in particular it relates to which a kind of low energy consumption environment protection is electro-hydraulic
Take valve test platform.
Background technology
Electrohydraulic servo valve is the key element in electro-hydraulic servo control, and it is after one kind receives analog electrical signal, corresponding defeated
Go out the flow of modulation and the hydraulic control valve of pressure.Electrohydraulic servo valve have dynamic response is fast, control accuracy is high, service life length
The advantages that, it is widely used in the electrohydraulic servo-controlling system in the fields such as Aeronautics and Astronautics, naval vessel, metallurgy, chemical industry.
Electrohydraulic servo-controlling system occupies an important position in control field, particularly high-power, fast, accurately
Played an important role in control system.Electrohydraulic servo valve is main executing agency therein.Carried out before valve dispatches from the factory and after maintenance
Performance test is essential link.Traditional test system is mostly made up of discrete simulation instrument, in test process,
Simulated test curve being recorded on paper typically by analog meter or test data being recorded by testing crew, data are then carried out hand
Work handles to obtain performance indications.Obviously, this method workload is big, speed is slow, efficiency is low, low precision.
At present, from the point of view of the data that power industry hydraulic control quality testing center obtains, caused by oil pollution electro-hydraulic
The easily worn part such as servo valve bite and seal damage failure accounts for 20%；Leakage increase failure is caused to account for 60% by abrasion
Left and right；By other reasonses cause performance unstable and Parameters variation accounts for 20% or so.
Therefore, the timely detection of electro-hydraulic servo valve performance, its probability to break down can effectively be reduced.
According to GB/T15623-1995B standards, the automatic test of electrohydraulic servo valve needs to complete static properties test (sky
Carry characteristic, pressure gain characteristics, load characteristic) and dynamic performance testing (amplitude versus frequency characte, phase-frequency characteristic), it is straight on performance curve
Reading performance indications are connect, and curve can be preserved into the data file that can be called at any time.Hydraulic test principle and national standard phase
Together.
Automatic test is exactly using modern sensor technology, electronic technology and computer technology, originally by testing crew
Manual single-spot testing, reading simulation instrument, record data, the process of description curve are promptly automatic continuous with Auto-Test System
Ground is tested each point, preserves data file and automatically generates performance curve, so as to draw each performance of electrohydraulic servo valve
Index.Wherein, no-load characteristic, load characteristic, the test of dynamic characteristic are most representative.To realize autorun, test
System is divided into testboard hydraulic system and automatic measuring and controlling unit in structure.
However, existing electro-hydraulic servo valve test device, it is poor measuring accuracy to be present, the defects of high energy consumption.
Test for electrohydraulic servo valve, the current country are primarily present following patent document：
Chinese patent Authorization Notice No.：CN202381451U, disclose a kind of electrohydraulic servo valve test system, described electricity
Hydraulic servo is provided with oil inlet, oil-out and the first hydraulic pressure delivery outlet and the second hydraulic pressure delivery outlet, described test system
Including the industrial computer, testboard adapter and testboard being sequentially connected, electrohydraulic servo valve to be measured is located on testboard, and is passed through
Testboard connecting test platform adapter.Compared with prior art, the utility model can be quickly real using reversal valve and magnetic valve
The switching and reconstruct of existing oil circuit, make the detection of electrohydraulic servo valve quicker, convenient.However, the test system that the patent is provided
System, structure composition is simple, and once a servo valve can only be tested, and efficiency is low, tests DeGrain.
Utility model content
To solve above-mentioned problem, the purpose of this utility model is to provide a kind of low energy consumption environment protection electrohydraulic servo valve
Testboard, the testboard is different according to flow, sets large and small valve seat, two electrohydraulic servo valves can be entered according to flow difference
Row test, reasonable in design, good appearance；Work safety, it is reliable, using be simple and convenient to operate, that data shows is accurate and clearly
It is clear；There are good maintainability, visuality and interchangeability；There is good testability, be easy to find out failure and fix a breakdown；Good behaviour
Control and experimental enviroment, testing stand have the operating condition for meeting human engineering.
To reach above-mentioned purpose, the technical solution of the utility model is：
A kind of low energy consumption environment protection electrohydraulic servo valve testboard, the testboard include：Operating desk, side are responsible for by oil-feed
BOR Bunker of Redelivery interface, the other end of the relative fuel oil interface of oil-feed supervisor enter oil inlet pipe with first, second respectively and are connected, and first, second
Enter oil inlet pipe and be responsible for one end close to oil-feed to set first, second high-pressure pneumatic ball valve respectively；Large and small valve seat, it is arranged at the behaviour
Make on platform, first, second servo valve be set respectively thereon, first, second servo valve oil inlet respectively with first, second oil-feed branch
The other end connection of the relative oil-feed supervisor of pipe, first, second enter oil inlet pipe be respectively equipped with first close to large and small valve seat one end, the
Two input pressure tables cut-off switch, and oil pressure is entered by pipeline and first, second input pressure table throttle switch and first, second
Force snesor is sequentially connected；First, second oil returning branch pipe, it is connected with the first, second servo valve oil return opening, divides thereon respectively
First, second pneumatic ball valve is not set, first, second return pressure table cut-off switch is also set respectively, and passes through pipeline respectively
First, second return pressure table throttle switch and first, second return pressure sensor are connected to successively；First, second circulation pipe,
Connected respectively with the loading interfaces of first, second servo valve two first, second, form circulation loop, set the respectively thereon
First, second flow sensor, set first respectively on first, second circulation pipe of two first, second loading interfaces both sides,
Second circulation pressure gauge cut-off switch；Oil return be responsible for, one end large and small valve seat relative with first, second oil returning branch pipe it is another
One end end connects respectively, other end BOR Bunker of Redelivery liquid return hole, is sequentially provided with the 3rd pneumatic ball valve, Pneumatic three-way valve and oil return thereon
Pressure gauge cut-off switch, the another both ends of Pneumatic three-way valve pass through oil return circulation pipe and the oil return master of relatively described fuel oil liquid return hole one end
Pipe forms circulation line, and the 3rd flow sensor is set on the oil return circulation pipe；Gas control relief valve, inlet and liquid outlet pass through
Pipeline is in parallel with the 3rd pneumatic ball valve, and leakage fluid dram is run in liquid pump by pipeline；Discharging tube, one end pump out liquid with the discharge opeing
Mouth connection, other end BOR Bunker of Redelivery leakage fluid dram.
Further, in addition to two ventilating fans, the operating desk opposite side both ends are respectively arranged at, by pipeline respectively with institute
State oil-feed supervisor, oil return supervisor and discharging tube connection.
In addition, high pressure filter is set on the oil-feed supervisor, another termination principal pressure of the relative fuel oil interface of oil-feed supervisor
Table cut-off switch.
Separately have, positioned at the high pressure filter liquid outlet side oil-feed supervisor on by pipeline respectively with temperature sensor
And accumulator connection, the accumulator and the pipeline of oil-feed supervisor's connection are provided with high-pressure ball valve.
Again, the three, the 4th high-pressure pneumatic ball valves are connected to respectively on the second circulation pipe of second flow sensor both sides,
On second circulation pipe between the three, the 4th high-pressure pneumatic ball valves and two second loading interfaces also respectively by pipeline successively
It is connected to first, second circulating pressure table throttle switch and first, second circulating pressure sensor.
Further, setting two feedback hydraulic fluid ports in the second solenoid valve, each hydraulic fluid port that feeds back is connected to feedback oil by pipeline respectively
Pressure gauge cut-off switch and feedback oil pressure force snesor, feedback oil pressure force snesor are provided with anti-with the pipeline that feedback hydraulic fluid port is connected
Present oil pressure table throttle switch.
And a y-type filter is further connected with the positive displacement pump.
Separately have, on the pipeline between gas control pressure-relief valve and positive displacement pump along fluid flow direction be connected to successively gas control pressure-conducting valve,
Proportioning valve, pressure-reducing valve and reversal valve, the reversal valve are mechanical button valve.
In addition, also include a pneumatic triple piece, the pipeline connection by pipeline and between pressure-reducing valve and reversal valve.
The beneficial effects of the utility model are：
The testboard is different according to flow, sets large and small valve seat, two electrohydraulic servo valves can be entered according to flow difference
Row test, reasonable in design, good appearance；Work safety, it is reliable, using be simple and convenient to operate, that data shows is accurate and clearly
It is clear；There are good maintainability, visuality and interchangeability；There is good testability, be easy to find out failure and fix a breakdown；Good behaviour
Control and experimental enviroment, testing stand have the operating condition for meeting human engineering.
Brief description of the drawings
Fig. 1 is that a kind of use principle of low energy consumption environment protection electrohydraulic servo valve testboard provided by the utility model is illustrated
Figure.
Embodiment
The utility model is described further below by specific embodiment, but embodiment is not intended to limit this practicality newly
The protection domain of type.
Reference picture 1, a kind of low energy consumption environment protection electrohydraulic servo valve testboard described in the utility model, the testboard bag
Include：101 BOR Bunker of Redelivery interfaces 102 are responsible in operating desk 100, side by oil-feed, and the another of 101 relative fuel oil interfaces 102 is responsible in oil-feed
One end is entered oil inlet pipe 103,103 ' with first, second and is connected respectively, and first, second enters oil inlet pipe 103,103 ' is responsible for close to oil-feed
101 one end set first, second high-pressure pneumatic ball valve 11,11 ' respectively；Large and small valve seat 200,200 ', is arranged at the operating desk
On 100, first, second servo valve 300,300 ' is set respectively thereon, first, second servo valve 300,300 ' oil inlets 301,
301 ' enter oil inlet pipe 103,103 ' with first, second respectively is connected with respect to the other end of oil-feed supervisor 101, first, second oil-feed
Branch pipe 103,103 ' close to large and small valve seat 200,200 ' one end be respectively equipped with first, second input pressure table cut-off switch 104,
104 ', and pass through pipeline and first, second input pressure table throttle switch 105,105 ' and first, second input pressure sensor
106th, 106 ' it is sequentially connected；First, second oil returning branch pipe 400,400 ', respectively with first, second servo valve 300,300 '
Oil return opening 302,302 ' connects, and sets first, second pneumatic ball valve 401,401 ' respectively thereon, also sets first, second respectively
Return pressure table cut-off switch 402,402 ', and it is connected to first, second return pressure table throttle switch successively by pipeline respectively
403rd, 403 ' and first, second return pressure sensor 404,404 '；First, second circulation pipe 500,500 ', respectively with it is described
First, second servo valve 300, the connection of 300 ' two first, second loading interfaces 303,303 ', form circulation loop, distinguish thereon
First, second flow sensor 501,501 ' is set, positioned at two first, second loading interfaces 303, the first of 303 ' both sides,
First, second circulating pressure table cut-off switch 502,502 ' is set respectively on two circulation pipes 500,500 '；Oil return supervisor 600, one
End is connected respectively with the other end end of the relatively large and small valve seat 200,200 ' of first, second oil returning branch pipe 400,400 ', separately
One end BOR Bunker of Redelivery liquid return hole 601, the 3rd pneumatic ball valve 602, Pneumatic three-way valve 603 and the cut-off of return pressure table are sequentially provided with thereon
Switch 604, the oil return that 603 another both ends of Pneumatic three-way valve pass through oil return circulation pipe 605 and relatively described one end of fuel oil liquid return hole 601
Supervisor 600 forms circulation line, and the 3rd flow sensor 606 is set on the oil return circulation pipe 605；Gas control relief valve 700, feed liquor
Mouthfuls 701 and liquid outlet 702 it is in parallel with the 3rd pneumatic ball valve 602 by pipeline, leakage fluid dram 703 is run in liquid pump by pipeline
704；Discharging tube 800, one end are connected with the liquid outlet of positive displacement pump 704, other end BOR Bunker of Redelivery leakage fluid dram 801.
Further, in addition to two ventilating fans 107, the opposite side both ends of operating desk 100 are respectively arranged at, pass through pipeline point
It is not connected with oil-feed supervisor 101, oil return supervisor 600 and discharging tube 800.
In addition, setting high pressure filter 108 on the oil-feed supervisor 101, the another of 101 relative fuel oil interfaces 102 is responsible in oil-feed
One termination principal pressure table cut-off switch 109.
Separately have, positioned at the liquid outlet side of high pressure filter 108 oil-feed supervisor 101 on by pipeline respectively with temperature
Sensor 110 and accumulator 111 connect, and the pipeline that the accumulator 111 is connected with oil-feed supervisor 101 is provided with high-pressure ball valve
112。
Again, the three, the 4th high pressures are connected to respectively on the second circulation pipe 500 ' of the both sides of second flow sensor 501 '
Pneumatic ball valve 503 ', 504 ', between the three, the 4th high-pressure pneumatic ball valves 503 ', 504 ' and two second loading interfaces 303 '
Second circulation pipe 500 ' on be also connected to first, second circulating pressure table throttle switch 505 ', 506 ' successively by pipeline respectively
With first, second circulating pressure sensor 507 ', 508 '.
Further, setting two feedback hydraulic fluid ports 304 ' in the second solenoid valve 300 ', each hydraulic fluid port 304 ' that feeds back passes through pipeline point
Be not connected to feedback oil pressure power table cut-off switch 305 ' and feedback oil pressure force snesor 306 ', feedback oil pressure force snesor 306 ' with it is anti-
The pipeline that feedback hydraulic fluid port 304 ' connects is provided with feedback oil pressure power table throttle switch 307 '.
And a y-type filter 705 is further connected with the positive displacement pump 704.
Separately have, being connected to gas control successively along fluid flow direction on the pipeline between gas control pressure-relief valve 700 and positive displacement pump 704 leads
Pressure valve 706, proportioning valve 707, pressure-reducing valve 708 and reversal valve 709, the reversal valve are mechanical button valve.
In addition, also including a pneumatic triple piece 900, pass through pipeline and the pipeline between pressure-reducing valve 708 and reversal valve 709
Connection.
A kind of low energy consumption environment protection electrohydraulic servo valve testboard provided by the utility model, use and installation and debugging method are such as
Under：
Technical parameter：
1) working media：No. 3 jet fuels (GB6537-2006)；
2) operating pressure：2~35Mpa is adjustable
3) return pressure：0.5~7MPa is adjustable
4) oil cleanliness：Better than NAS 1638-6 levels
5) first flow sensor 501：Measurement range 1-160L/min；Measurement accuracy：0.3 grade
6) second flow sensor 501 '：Measurement range 1-60L/min；Measurement accuracy：0.3 grade
7) the 3rd flow sensor 606：Measurement range 0.04-8L/min；Measurement accuracy：0.3 grade
8) input pressure sensor：Measurement range 0-40MPa；Measurement accuracy：0.3 grade
9) return pressure sensor：Measurement range 0-10MPa；Measurement accuracy：0.3 grade
Testboard menu：
Debugging：
1) load connection is checked, confirms that first, second servo valve 300,300 ' is installed on large and small valve seat 200,200 '
It is errorless.
2) ensure that all fuel outlet valves and sampling valve are closed mode.Check again for the connection of pipeline, circuit, it is ensured that connection is just
Really.
3) operate, operated according to menu above below, hand-operated valve must be first opened before operation, is then turned on electrodynamic pump
Valve.
4) according to menu " big valve seat work ", servo valve testboard correlation pump valve is opened.
5) testing stand cools
A) according to menu " air draft cooling ", servo valve testboard correlation pump valve is opened.
B) ventilating fan 107 of observation two whether normal work.
6) big valve seat 200 works
A) according to menu " big valve seat work ", servo valve testboard correlation pump valve is opened.
B) observation first enter the return pressure sensor 404 of oil sensor 106 and first whether normal work.
7) small valve seat 200 ' works
A) according to menu " small valve seat work ", servo valve testboard correlation pump valve is opened.
B) observation second enter oil sensor 106 ' and the second return pressure sensor 404 ' whether normal work.
C) according to menu " control mouth measurement of discharge ", servo valve testboard correlation pump valve is opened.
D) observe second flow sensor 501 ' whether normal work.
E) according to menu " backpressure regulation ", servo valve testboard correlation pump valve is opened.
F) the return pressure sensor 404 ' of observation second whether normal work.
G) according to menu " drain tap measurement of discharge ", servo valve testboard correlation pump valve is opened.
H) the flow sensor sensor 606 of observation the 3rd whether normal work.
I) it is initial state to recover all pump valves.
8) testing stand discharge opeing
A) according to menu " discharge opeing ", servo valve testboard correlation pump valve is opened.
B) observe positive displacement pump 704 whether normal work.
It should be noted that above example is only illustrating the technical solution of the utility model and unrestricted.Although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those within the art that, can be to reality
Modified with new technical scheme or equivalent substitution, without departing from the scope of technical solutions of the utility model, it all should
Cover in right of the present utility model.
Claims (9)
1. a kind of low energy consumption environment protection electrohydraulic servo valve testboard, it is characterised in that the testboard includes：
BOR Bunker of Redelivery interface is responsible in operating desk, side by oil-feed, the other end of the relative fuel oil interface of oil-feed supervisor respectively with first,
Second enters oil inlet pipe connection, and first, second, which enters oil inlet pipe, is responsible for one end close to oil-feed and sets first, second high-pressure pneumatic ball respectively
Valve；
Large and small valve seat, it is arranged on the operating desk, first, second servo valve, first, second servo valve is set respectively thereon
Oil inlet enters the other end connection of oil inlet pipe relative oil-feed supervisor with first, second respectively, and first, second to enter oil inlet pipe close
Large and small valve seat one end is respectively equipped with first, second input pressure table cut-off switch, and enters oil pressure by pipeline and first, second
Power table throttle switch and first, second input pressure sensor are sequentially connected；
First, second oil returning branch pipe, it is connected respectively with the first, second servo valve oil return opening, sets first, the respectively thereon
Two pneumatic ball valves, first, second return pressure table cut-off switch is also set respectively, and be connected to by pipeline first successively respectively,
Second return pressure table throttle switch and first, second return pressure sensor；
First, second circulation pipe, connected respectively with the loading interfaces of first, second servo valve two first, second, form circulation
Loop, first, second flow sensor is set respectively thereon, first, second positioned at two first, second loading interfaces both sides follows
First, second circulating pressure table cut-off switch is set respectively on endless tube；
Oil return is responsible for, and the other end end of one end large and small valve seat relative with first, second oil returning branch pipe connects respectively, separately
One end BOR Bunker of Redelivery liquid return hole, the 3rd pneumatic ball valve, Pneumatic three-way valve and return pressure table cut-off switch is sequentially provided with thereon, pneumatically
The another both ends of triple valve are responsible for form circulation line by the oil return of oil return circulation pipe and relatively described fuel oil liquid return hole one end, this time
3rd flow sensor is set on oil circulating pipe；
Gas control relief valve, inlet and liquid outlet are in parallel with the 3rd pneumatic ball valve by pipeline, and leakage fluid dram is connect by pipeline
Positive displacement pump；
Discharging tube, one end are connected with the positive displacement pump liquid outlet, other end BOR Bunker of Redelivery leakage fluid dram.
2. a kind of low energy consumption environment protection electrohydraulic servo valve testboard according to claim 1, it is characterised in that also including two rows
Fan, be respectively arranged at the operating desk opposite side both ends, by pipeline respectively with the oil-feed supervisor, oil return supervisor and discharge opeing
Pipe connects.
A kind of 3. low energy consumption environment protection electrohydraulic servo valve testboard according to claim 1, it is characterised in that the oil-feed master
High pressure filter, another termination principal pressure table cut-off switch of the relative fuel oil interface of oil-feed supervisor are set on pipe.
4. a kind of low energy consumption environment protection electrohydraulic servo valve testboard according to claim 2, it is characterised in that positioned at the height
Press through and be connected respectively with temperature sensor and accumulator by pipeline on the oil-feed supervisor of filter liquid outlet side, the accumulator
High-pressure ball valve is provided with the pipeline of oil-feed supervisor's connection.
5. a kind of low energy consumption environment protection electrohydraulic servo valve testboard according to claim 1, it is characterised in that positioned at second
The three, the 4th high-pressure pneumatic ball valves are connected to respectively on the second circulation pipe of quantity sensor both sides, positioned at the three, the 4th high-pressure pneumatics
First, second circulating pressure is also connected to successively by pipeline respectively on second circulation pipe between ball valve and two second loading interfaces
Table throttle switch and first, second circulating pressure sensor.
6. a kind of low energy consumption environment protection electrohydraulic servo valve testboard according to claim 1, it is characterised in that described second watches
Take and two feedback hydraulic fluid ports are set on valve, each hydraulic fluid port that feeds back is connected to feedback oil pressure power table cut-off switch and feedback oil pressure by pipeline respectively
Force snesor, the pipeline that feedback oil pressure force snesor is connected with feedback hydraulic fluid port are provided with feedback oil pressure power table throttle switch.
A kind of 7. low energy consumption environment protection electrohydraulic servo valve testboard according to claim 1, it is characterised in that the positive displacement pump
On be further connected with a y-type filter.
8. a kind of low energy consumption environment protection electrohydraulic servo valve testboard according to claim 1, it is characterised in that unloaded positioned at gas control
Gas control pressure-conducting valve, proportioning valve, pressure-reducing valve and reversal valve, institute are connected to successively along fluid flow direction on pipeline between pressure valve and positive displacement pump
It is mechanical button valve to state reversal valve.
9. a kind of low energy consumption environment protection electrohydraulic servo valve testboard according to claim 8, it is characterised in that also including a gas
Dynamic three linked piece, the pipeline connection by pipeline and between pressure-reducing valve and reversal valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621382923.9U CN206682080U (en) | 2016-12-15 | 2016-12-15 | A kind of low energy consumption environment protection electrohydraulic servo valve testboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621382923.9U CN206682080U (en) | 2016-12-15 | 2016-12-15 | A kind of low energy consumption environment protection electrohydraulic servo valve testboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206682080U true CN206682080U (en) | 2017-11-28 |
Family
ID=60393904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621382923.9U Expired - Fee Related CN206682080U (en) | 2016-12-15 | 2016-12-15 | A kind of low energy consumption environment protection electrohydraulic servo valve testboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206682080U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110454450A (en) * | 2019-08-01 | 2019-11-15 | 烟台中宇航空液压有限公司 | Hydraulic protector for electrohydraulic servo control system |
| CN111896818A (en) * | 2019-05-05 | 2020-11-06 | 上海赫技机电技术服务有限公司 | Special test platform for servo valve |
-
2016
- 2016-12-15 CN CN201621382923.9U patent/CN206682080U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896818A (en) * | 2019-05-05 | 2020-11-06 | 上海赫技机电技术服务有限公司 | Special test platform for servo valve |
| CN110454450A (en) * | 2019-08-01 | 2019-11-15 | 烟台中宇航空液压有限公司 | Hydraulic protector for electrohydraulic servo control system |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171128 Termination date: 20201215 |