CN206608402U - The quick accurate detection device of internal leakage of hydraulic valve amount - Google Patents
The quick accurate detection device of internal leakage of hydraulic valve amount Download PDFInfo
- Publication number
- CN206608402U CN206608402U CN201720305702.XU CN201720305702U CN206608402U CN 206608402 U CN206608402 U CN 206608402U CN 201720305702 U CN201720305702 U CN 201720305702U CN 206608402 U CN206608402 U CN 206608402U
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- hydraulic valve
- axle
- flabellum
- internal leakage
- valve
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Abstract
The utility model discloses a kind of quick accurate detection device of internal leakage of hydraulic valve amount, belong to internal leakage of hydraulic valve amount detection technique field.The utility model device includes being connected to pneumatic rotary shaft flowmeter on supply loop, supply loop, and pneumatic rotary shaft flowmeter is arranged between supply loop and hydraulic valve oil inlet pipe to be measured；The pneumatic rotary shaft flowmeter includes the axle with flabellum, and one end of the axle with flabellum is stretched out from housing and connects magnetic strength current display device, and magnetic strength current display device is connected to amplifying circuit, and amplifying circuit is connected to show the ammeter of induction current intensity.The quick accurate detecting method of the utility model, including measurement apparatus demarcation, measurement and the step such as measure batch, realize quick, accurate, batch the detection to internal leakage of hydraulic valve amount.
Description
Technical field
The utility model is related to leak detection apparatus in a kind of hydraulic valve, belongs to hydraulic valve detection technique field.
Background technology
Hydraulic valve commutation operation principle be：By external force（Can be electromagnetic force, fluid power or manual actuation power etc.）Drive is pushed away
Bar, makes valve element produce the relative slip relative to valve body, is turned on and off corresponding oil circuit, reaches the purpose of conversion oil circuit.
In said process, in order to ensure smooth action of the valve element in valve body, need to keep certain gap between the two, otherwise can make
It is in close contact into valve element and valve body, frictional force is excessive and can not act.Due to the presence of valve element and valve body fit clearance, it may appear that
Operationally, hydraulic oil is flowed to the physical phenomenon of low-pressure area by the higher-pressure region of valve to hydraulic valve, and this flowing occurs in hydraulic valve
Portion, referred to as internal leakage.In addition, valve body has damage with valve element contact line (face), not closely sealed each other, the valve element front end conical surface and valve element
It is cylindrical when cylindrical not coaxial, valve body hole and valve element axiality are overproof, valve element is assembled to be produced with valve body hole fit clearance in hole greatly
It is raw it is crooked press-fit wait manufacture or assemble quality fault, be likely to cause internal leakage of hydraulic valve.
The internal leakage of hydraulic valve is different from external leakage, external leakage refer to hydraulic valve with the junction of other Hydraulic Elements to
The phenomenon of outer oil leak.External leakage is directly perceived, easily observe, easily avoids；And internal leakage then mostly occurs inside hydraulic valve, it is difficult to see
Examine, and can not avoid, i.e., hydraulic valve more or less has internal leakage.Therefore when manufacturing and assembling hydraulic valve, typically by valve
Clearance control between core and valve body is within the specific limits（It is generally 5-30um diametric clearance in engineering）, correspondingly, to should between
The internal leakage of the hydraulic oil of gap scope just turns into one of key property of measurement hydraulic valve.Internal leakage is excessive, can make hydraulic pressure
Executing agency's action of system assembling main frame is not in place, it is difficult to accurate control action track, also occurs that from acting, makes when serious
Into potential safety hazard.
The existing detection technique to internal leakage of hydraulic valve amount has two kinds：One is the drop number of manual record leakage fluid, Ran Houzhuan
A milliliter number is changed to, or is collected and measures with measuring cup, this detection mode, which is existed, is affected by human factors big, detection
The low shortcoming of efficiency, it is difficult to meet the high-volume automation quality testing requirement of hydraulic valve；Two be to measure stream by flow sensor
Value, then carries out calculating the problem of obtaining leakage rate value, this detection method and being current flow sensor in micro-, rill
The degree of accuracy for being difficult to measure or measure in the case of amount is very low, it is impossible to meet the requirement that range ability is big, measurement accuracy is high.
Another looked into from presently disclosed patented technology newly obtains：Yu Zhonghua and Lu Bin（Number of patent application：
201110403891.1）The innovation of " a kind of internal leakage detection means of hydraulic valve " that is proposed is using biography of weighing
The modern electronic technology such as sensor, transmitter, SCM system, display chip means are entered to the metering method of internal leakage of hydraulic valve amount
Go improvement, and do not relate to and propose substantive innovation on the Cleaning Principle and method of internal leakage of hydraulic valve amount.Shen Yan
Health etc.（Number of patent application：201210367976.3）" detection method and its device of a kind of internal leakage of hydraulic valve " proposed
In, detection method is surveyed hydraulic jack and the access of tested solution pressure valve by the way of hydraulic jack and displacement transducer combination
In test tube road, by detecting the displacement of hydraulic cylinder piston, the leakage rate of tested solution pressure valve in a period of time is conversed.This is special
Profit does not provide conversion proof procedure without method foundation is clearly discussed yet, and discusses according to insufficient, consultant can not obtain
Know the true spirit of its claimed method.
The content of the invention
In place of in order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of the quick of internal leakage of hydraulic valve amount
Accurate detection device, realizes quick, accurate, batch the detection to internal leakage of hydraulic valve amount.
The utility model is achieved by the following technical solution：A kind of device for fast detecting of internal leakage of hydraulic valve amount,
Including the supply loop being made up of air pump, point water water filter, pressure-reducing valve, choke valve and stop valve, it is connected on supply loop pneumatic
Rotary shaft flowmeter, pneumatic rotary shaft flowmeter is arranged between supply loop and hydraulic valve oil inlet pipe to be measured；
The pneumatic rotary shaft flowmeter includes having a venting cavity with gas outlet and air inlet on housing, housing
Body, ventilation cavity bottom, which has, an axle with flabellum that can be flowed and rotate with gas in a horizontal axocoel, horizontal axocoel,
Axle with flabellum is arranged in the horizontal axocoel by bearing, gasket seal and bearing (ball) cover, one end of the axle with flabellum from
Housing stretches out and connects magnetic strength current display device, and it is heavy that the shaft end that magnetic strength current display device is included in the axle with flabellum makes
The magnet bushing that can be rotated with the axle with flabellum is fixed with hole, counterbore, magnet bushing has holding screw to couple with hole inwall, axle
The outside at end, which is installed with nut, nut, through hole, is provided with the counterbore and coordinates generation faradic with magnet bushing
Coil, the two ends of coil pass through from the through hole of nut and are connected to amplifying circuit, and amplifying circuit is connected to show induced-current
The ammeter of intensity.
One end of the axle with flabellum, which is stretched out from housing and amplifies transmission by rotating speed, is connected with rotating shaft, the magnetic strength
Current display device is arranged in rotating shaft,
Magnetic strength current display device is included in the counterbore that the shaft end of rotating shaft makes, and being fixed with counterbore can be with axis of rotation
Magnet bushing, magnet bushing has holding screw to couple with hole inwall, and the outside of shaft end, which is installed with nut, nut, through hole, institute
State to be provided with to coordinate with magnet bushing in counterbore and produce faradic coil, the two ends of coil pass through and connected from the through hole of nut
Amplifying circuit is connected to, amplifying circuit is connected to show the ammeter of induction current intensity.
The rotating speed amplification transmission is V belt translation pair, and V belt translation pair includes big belt wheel, transmission belt and small pulley, big belt wheel
It is fixed on by belt wheel axial end cap and holding screw on the axle with flabellum.
Described ammeter is digital display ammeter or simulation table.
The beneficial effects of the utility model are：
1st, the utility model replaces pressure oil using pressed gas, because the density of gas is far smaller than the density of liquid,
Therefore the effect of Flow amplification is served, this measure overcomes insensitive shortcoming when measuring small, micrometeor using flow sensor.
2nd, it is to convert existing counting to leakage rate oil droplet, the gage work such as weigh using pneumatic internal leakage flowmeter
For the reading of the rotation speed change scope to the axle with flabellum；No matter the reading of follow-up internal leakage size using reading type or counts
Explicitly, uninterrupted can be all directly obtained, measuring principle is enormously simplify, makes measurement intuitively easy；Small rotation speed change turns
More sensitive curent change is turned to, induced current is followed by digital display ammeter by transistor amplifier or simulates electricity
, can direct reading in flow table, so that it may size that is sensitive and intuitively reading internal leakage.
3rd, to leakage rate oil droplet counting, the measuring method measurement efficiency such as weigh are low, and the utility model is implemented without waiting
Oil dripping is treated, measurement efficiency is substantially increased.
If the 4, carrying out logical pressure oil measurement, every hydraulic valve must all lead to oil in measurement, and measurement can not be kept away after terminating
Exempt from the internal oil passages of valve adhesion hydraulic oil, can not quickly clear up in short-term, hydraulic oil can also flow out during standing, pollute warehouse
Ground；And use the measurement of the utility model method, then above mentioned problem can be prevented effectively from, the energy has been saved in no hydraulic oil loss, protected
Environment is protected.
Brief description of the drawings
The utility model is further illustrated below according to drawings and examples.
Fig. 1 is the utility model structural representation；
Fig. 2 is pneumatic rotary shaft flowmeter structure schematic diagram；
Fig. 3 is Fig. 2 A-A sectional views；
Fig. 4 is Fig. 3 B-B profiles；
Fig. 5 is another example structure schematic diagram of utility model；
Fig. 6 is the utility model detection method first step measurement apparatus demarcation schematic diagram；
Fig. 7 is the utility model detection method batch detection schematic diagram.
In figure, 1, air pump, 2, point water water filter, 3, pressure-reducing valve, 4, stop valve, 5, choke valve, 6, air gauge, 7, pneumatic turn
Shaft type flowmeter, 7-1, housing, 7-2, the axle with flabellum, 7-3, bearing, 7-4, gasket seal, 7-5, bearing (ball) cover, 7-6, magnetic
Iron bushing, 7-7, coil, 7-8, nut, 7-9, amplifying circuit, 7-10, ammeter, 7-11, rotating shaft, 7-12, V belt translation pair, 7-
13rd, end cap, 8, hydraulic valve to be measured, 8-1, valve element, 8-2, valve body；9th, batch testing air inlet pipe, 9-1, test interface, Wa, allow
Minimum internal leakage calibrating valve, Wb, allow maximum internal leakage calibrating valve.
Embodiment
The utility model is further illustrated with reference to embodiment.
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of device for fast detecting of internal leakage of hydraulic valve amount, including by air pump 1, point water filter
The supply loop that hydrophone 2, pressure-reducing valve 3, choke valve 5 and stop valve 4 are constituted, supply is connected to pneumatic rotary shaft flowmeter 7 on loop,
Pneumatic rotary shaft flowmeter 7 is arranged between supply loop and the oil inlet pipe of hydraulic valve to be measured 8；
The pneumatic rotary shaft flowmeter 7 includes housing 7-1, has on housing 7-1 one to have gas outlet and air inlet
Ventilation cavity, ventilation cavity bottom, which has, has a band that can be flowed and rotate with gas to fan in a horizontal axocoel, horizontal axocoel
The axle 7-2 of leaf, the axle 7-2 with flabellum are arranged on the horizontal axocoel by bearing 7-3, gasket seal 7-4 and bearing (ball) cover 7-5
Interior, one end of the axle 7-2 with flabellum is stretched out from housing 7-1 and connects magnetic strength current display device, magnetic strength current display device bag
Include in the counterbore in the shaft end making of the axle 7-2 with flabellum, counterbore and be fixed with the magnet bushing that can be rotated with the axle 7-2 with flabellum
7-6, magnet bushing has holding screw to couple with hole inwall, and the outside of shaft end, which is installed with nut 7-8, nut 7-8, through hole, institute
State to be provided with to coordinate with magnet bushing 7-6 in counterbore and produce faradic coil 7-7, coil 7-7 two ends are from nut 7-8's
Through hole passes through and is connected to amplifying circuit 7-9, and amplifying circuit 7-9 is connected to show the ammeter 7-10 of induction current intensity.
Connect as shown in figure 5, one end of the axle 7-2 with flabellum is stretched out from housing 7-1 and amplifies transmission by rotating speed
Rotating shaft 7-11 is connected to, the magnetic strength current display device is arranged on rotating shaft 7-11, and magnetic strength current display device is included in rotating shaft
It is fixed with the counterbore that 7-11 shaft end makes, counterbore in the magnet bushing 7-6 that can be rotated with rotating shaft 7-11, magnet bushing and hole
Wall has holding screw connection, and the outside of shaft end, which is installed with nut 7-8, nut 7-8, through hole, is provided with and magnetic in the counterbore
Iron bushing 7-6, which coordinates, produces faradic coil 7-7, and coil 7-7 two ends, which pass through and are connected to from nut 7-8 through hole, puts
Big circuit 7-9, amplifying circuit 7-9 are connected to show the ammeter 7-10 of induction current intensity.Transmission is amplified by rotating speed
Speed amplification is carried out, induction current intensity is further enhanced, measurement sensitivity is improved.
The rotating speed amplification transmission is V belt translation secondary 7-12, and V belt translation secondary 7-12 includes big belt wheel, transmission belt and small band
Wheel, big belt wheel is fixed on the axle 7-2 with flabellum by belt wheel axial end cap 7-13 and holding screw.
Described ammeter 7-10 is digital display ammeter or simulation table.
In use, the axle 7-2 rotations with flabellum, band moving magnet bushing 7-6 follows rotation, and in counterbore placement coil 7-
7 are followed by digital display ammeter either mould due to cutting magnetic line meeting induced current, induced current by transistor amplifier
Intend on ammeter, can direct reading.If the current indication of institute's side valve exceedes allowed band, the internal leakage of valve is exceeded；Otherwise it is
It is qualified.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 6, Fig. 7, a kind of internal leakage of hydraulic valve amount of use described device it is quick accurate
Detection method, comprises the following steps,
A kind of quick accurate detecting method of the internal leakage of hydraulic valve amount of use described device, comprises the following steps,
The first step, measurement apparatus demarcation：
Cleaning Principle is：Measure loop produces air-flow, and the changes in flow rate of internal leakage gas can be embodied on flow velocity, measures gas
Rate of flow of fluid change would know that changes in flow rate, when changes in flow rate, the rotating speed of the axle 7-2 with flabellum can be made to change, different
The change of rotating speed can produce the induced-current of varying strength in magnetic strength current display device, pass through ammeter 7-10 instruction energy
Intuitively read the size of internal leakage；
Choose or pre- one internal leakage of hydraulic valve of making is the minimum internal leakage calibrating valve W of permissionaAllow with one maximum
Internal leakage calibrating valve Wb, first supply loop and pneumatic rotary shaft flowmeter 7 are installed to form measure loop, by pneumatic rotary shaft
Flowmeter 7 is connected to WaOil inlet P on, oil-out T is empty in gas, remaining mouth closure, regulation supply loop pressure-reducing valve 3, cut
Only valve 4 and choke valve 5, making the ammeter 7-10 of the pneumatic rotary shaft flowmeter 7 has registration, writes down now registration IaTo determine
Va；Measure loop is connected to W againbOn, write down WbRegistration IbTo determine Vb, Vb-VaScope be hydraulic valve internal leakage to be measured
Acceptability limit；
Second step, measurement：
Batch testing air inlet pipe 9 is got out, batch testing air inlet pipe 9 has a test interface 9-1 and multiple and batch
The hydraulic valve to be measured 8 that air inlet pipe 9 is connected is tested, each one stop valve of the correspondence of hydraulic valve 8 to be measured,
After the completion of the demarcation of upper step, measure loop is connected to test interface 9-1, multiple hydraulic valves to be measured 8 are sequentially opened
Stop valve, measures the internal leakage of this group of hydraulic valve, if test result is in Vb-VaIn the range of then to be qualified, go beyond the scope then
To be unqualified, i.e. ammeter 7-10 registration I is in IaAnd IbBetween be it is qualified, it is on the contrary then unqualified；Next group of replacing is surveyed.
Amplify transmission equipped with rotating speed in one end of the axle 7-2 with flabellum, transmission is amplified by rotating speed and enters scanning frequency
Degree amplification, further enhances induction current intensity, improves measurement sensitivity.
Theoretical foundation of the present utility model is：
From fluid continuity equation, Bernoulli equation and Throttle Principle, when fluid flows through standard throttle apparatus,
Produce pressure difference before and after it, this pressure difference and flow square are directly proportional.Therefore in hydraulic and pneumatic, under volume flow is available
Formula is calculated：
(1)
In above formula,CFor discharge coefficient,AFor passage section area,For pressure difference,For the density of fluid.
Meanwhile, flow can also be calculated according to passage section area, rate of flow of fluid and throughput time, i.e. following formula：
(2)
In above formula,vFor rate of flow of fluid,tFor throughput time.
Induced-current produced by coil cutting magnetic lineiSize can be calculated with following formula：
(3)
In above formula, eFor induced electromotive force,NFor coil turn,BFor magnetic field magnetic induction intensity,SFor area coil,For
Coil angular velocity of rotation,tFor the time,RFor coil resistance.
By（1）Formula, the density of gas is far smaller than the density of liquid, therefore passes through valve element and valve body with the fluid of uniform pressure
Between gap, the volume flow of gas is far longer than the volume flow of hydraulic oil.This is one of theoretical foundation of the present utility model.
By（2）Formula, cross-sectional flow area and throughput time are certain, and flow changes with the linear direct ratio of rate of flow of fluid.This is this
The two of the theoretical foundation of utility model.
Again by（1）Formula, if fluid density and pressure difference and discharge coefficient are certain, flow is with cross-sectional flow area also linear direct ratio
Change.This is the three of theoretical foundation of the present utility model.
By（3）Formula, it is known that induced-current is directly proportional to the angular velocity of rotation of coil, coil rotating speed is faster, and induced-current is got over
Greatly.This is the four of theoretical foundation of the present utility model.
Citing, it is three-position four-way valve to take hydraulic valve 8 to be measured, and valve element 8-1, valve body 8-2 illustrate the utility model principle such as
Under：
Tested hydraulic valve is accessed into test loop, pressed gas is passed through and replaces pressure oil.By according to one, loop gas flow
It is big during than being measured using pressure oil, serve the effect of Flow amplification.
For being tested hydraulic valve, it can be embodied in by the changes in flow rate according to two, internal leakage gas on flow velocity, therefore measurement gas
Change in flow would know that changes in flow rate.As shown in Fig. 1 utility model schematic diagrams, the principle of pneumatic rotary shaft flowmeter 7 is when stream
During amount change, the rotating speed of the axle 7-2 with flabellum can be made to change, it is this to vary less, as long as but the axle 7-2 hairs with flabellum
Raw rotation will follow rotation with moving magnet bushing 7-6, and the coil 7-7 of placement can be inducted electricity due to cutting magnetic line in counterbore
Stream, small rotation speed change is converted into more sensitive curent change, and induced current is followed by number by transistor amplifier
, can direct reading on aobvious ammeter either analog current table, so that it may size that is sensitive and intuitively reading internal leakage.
The utility model accommodation pressure oil is measured as logical pressed gas measurement, improves flow measurement sensitivity；Become existing
It is artificial that oil dripping is counted or oil dripping is weighed as to directly read registration, substantially increase measurement efficiency；If carrying out logical pressure oil to survey
Amount, then every hydraulic valve must all lead to oil in measurement, the inevitably adhesion liquid on the internal oil passages of valve after measurement terminates
Force feed, can not quickly be cleared up, hydraulic oil can also flow out during standing in short-term, pollute warehouse floor；And use the utility model method
Measurement, then can be prevented effectively from above mentioned problem, and no hydraulic oil loss has saved the energy, protected environment.
Claims (4)
1. a kind of device for fast detecting of internal leakage of hydraulic valve amount, it is characterised in that：Including by air pump（1）, point water water filter
（2）, pressure-reducing valve（3）, choke valve（5）And stop valve（4）The supply loop of composition, supply is connected to pneumatic rotary shaft flow on loop
Meter（7）, pneumatic rotary shaft flowmeter（7）Installed in supply loop and hydraulic valve to be measured（8）Between oil inlet pipe；
The pneumatic rotary shaft flowmeter（7）Including housing（7-1）, housing（7-1）On have one have gas outlet and air inlet
Ventilation cavity, ventilation cavity bottom, which has, a band that can be flowed and rotate with gas in a horizontal axocoel, horizontal axocoel
The axle of flabellum（7-2）, the axle with flabellum（7-2）Pass through bearing（7-3）, gasket seal（7-4）And bearing (ball) cover（7-5）It is arranged on
In the horizontal axocoel, the axle with flabellum（7-2）One end from housing（7-1）Stretch out and connect magnetic strength current display device, magnetic
Inducing current display device is included in the axle with flabellum（7-2）The counterbore that makes of shaft end, being fixed with counterbore can be with flabellum
Axle（7-2）The magnet bushing of rotation（7-6）, magnet bushing has holding screw to couple with hole inwall, and the outside of shaft end is installed with spiral shell
It is female（7-8）, nut（7-8）On have in through hole, the counterbore and be provided with and magnet bushing（7-6）Coordinate and produce faradic line
Circle（7-7）, coil（7-7）Two ends from nut（7-8）Through hole pass through and be connected to amplifying circuit（7-9）, amplifying circuit（7-
9）It is connected to show the ammeter of induction current intensity（7-10）.
2. the device for fast detecting of internal leakage of hydraulic valve amount according to claim 1, it is characterised in that：It is described with flabellum
Axle（7-2）One end from housing（7-1）Stretch out and transmission is amplified by rotating speed and be connected with rotating shaft（7-11）, the magnetic strength electric current
Display device is arranged on rotating shaft（7-11）On,
Magnetic strength current display device is included in rotating shaft（7-11）The counterbore that makes of shaft end, being fixed with counterbore can be with rotating shaft（7-
11）The magnet bushing of rotation（7-6）, magnet bushing has holding screw to couple with hole inwall, and the outside of shaft end is installed with nut（7-
8）, nut（7-8）On have in through hole, the counterbore and be provided with and magnet bushing（7-6）Coordinate and produce faradic coil（7-
7）, coil（7-7）Two ends from nut（7-8）Through hole pass through and be connected to amplifying circuit（7-9）, amplifying circuit（7-9）Even
Connect the ammeter for showing induction current intensity（7-10）.
3. the device for fast detecting of internal leakage of hydraulic valve amount according to claim 2, it is characterised in that：The rotating speed amplification
Transmission is V belt translation pair（7-12）, V belt translation pair（7-12）Including big belt wheel, transmission belt and small pulley, big belt wheel passes through belt wheel
Axial end cap（7-13）The axle with flabellum is fixed on holding screw（7-2）On.
4. the device for fast detecting of internal leakage of hydraulic valve amount according to claim 1 or 2, it is characterised in that：Described electricity
Flow table（7-10）It is digital display ammeter or simulation table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720305702.XU CN206608402U (en) | 2017-03-27 | 2017-03-27 | The quick accurate detection device of internal leakage of hydraulic valve amount |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720305702.XU CN206608402U (en) | 2017-03-27 | 2017-03-27 | The quick accurate detection device of internal leakage of hydraulic valve amount |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206608402U true CN206608402U (en) | 2017-11-03 |
Family
ID=60173120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720305702.XU Withdrawn - After Issue CN206608402U (en) | 2017-03-27 | 2017-03-27 | The quick accurate detection device of internal leakage of hydraulic valve amount |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206608402U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837933A (en) * | 2017-03-27 | 2017-06-13 | 徐州工程学院 | The quick accurate detecting method and device of a kind of internal leakage of hydraulic valve amount |
| CN112855641A (en) * | 2019-11-12 | 2021-05-28 | 上海朝田实业股份有限公司 | Automatic hydraulic valve |
-
2017
- 2017-03-27 CN CN201720305702.XU patent/CN206608402U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106837933A (en) * | 2017-03-27 | 2017-06-13 | 徐州工程学院 | The quick accurate detecting method and device of a kind of internal leakage of hydraulic valve amount |
| CN112855641A (en) * | 2019-11-12 | 2021-05-28 | 上海朝田实业股份有限公司 | Automatic hydraulic valve |
| CN112855641B (en) * | 2019-11-12 | 2023-01-03 | 上海朝田实业股份有限公司 | Automatic hydraulic valve |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20171103 Effective date of abandoning: 20181130 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20171103 Effective date of abandoning: 20181130 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |