CN105526210B - A kind of small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position and its device - Google Patents
A kind of small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position and its device Download PDFInfo
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- CN105526210B CN105526210B CN201610019569.1A CN201610019569A CN105526210B CN 105526210 B CN105526210 B CN 105526210B CN 201610019569 A CN201610019569 A CN 201610019569A CN 105526210 B CN105526210 B CN 105526210B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/87—Detection of failures
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Abstract
The invention discloses a kind of small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position and its device.A kind of small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position, using the combination of loading cylinder horizontal addload experimental rig and liquid level sensor, displacement transducer, the level change of detection subject hydraulic cylinder oil return line and the change in displacement of piston rod, two kinds of changes are converted into hydraulic oil Volume Changes, then by both volume differences divided by measurement effective time are internal leakage value.A kind of small internal leakage measurement apparatus in hydraulic cylinder arbitrary distance of run position, including loading cylinder horizontal addload experimental rig, liquid level sensor, fluid collection vessel, displacement transducer, liquid level sensor is arranged on the oil return circuit of subject hydraulic cylinder with fluid collection vessel, and displacement transducer is connected by hydraulic cylinder piston rod.The present invention can measure the internal leakage of hydraulic cylinder arbitrary distance of run position, while the present invention ensures measurement accuracy using sensor, have the advantages that measurement accuracy is high.
Description
Technical field
The present invention relates to a kind of small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position and device, more particularly to cylinder
There is the hydraulic cylinder interior leakage leakage quantity detection of local damage in cylinder inwall, belong to leak detection technology field.
Background technology
The most common failure of hydraulic cylinder is internal leakage, and the reason for causing it to produce internal leakage mainly has：The drawing of inner wall of cylinder
Wound, abrasion and the damage of piston seal.According to JB/T10205-2010《Hydraulic cylinder》The regulation of middle performance requirement, to hydraulic pressure
Cylinder carries out all needing to measure its internal leakage when type inspection and exfactory inspection, and measuring method is set forth in national standard GB/T15622-2005
《Hydraulic cylinder test method》In, the experimental rig measured has loading cylinder horizontal addload experimental rig to be tried with weight simulation loading
Experiment device, national standard GB/T15622-2005《Hydraulic cylinder test method》The method of middle internal leakage measurement is described as " making subject hydraulic pressure
Cylinder working chamber oil-feed, is forced into rated pressure or user's specified pressure, determines the leakage rate that non-pressurizing chamber is leaked to through piston ",
And the position of stroke is simultaneously when in this method for specifically how to determine leakage rate and measurement that non-pressurizing chamber is leaked to through piston
Do not describe in detail.
Hydraulic cylinder interior leakage, which leaks current measuring method, mainly to be had：Pressurize method, sedimentation, the direct method of measurement.Wherein, pressurize method
Internal leakage is measured without standard measure；Sedimentation measurement error is larger can not accurately to measure small internal leakage；Direct measurement
The position of method measurement can be only in the two ends of hydraulic cylinder travel, and exist for hydraulic cylinder arbitrary distance of run position inner wall of cylinder and pull
Or can not then be measured during abrasion, it refer to use lubricating cup in patent CN202441672U hydraulic jacks internal leakage detection apparatus,
Internal leakage is measured by observing the change of its liquid level scale, but this measurement apparatus is only applicable to measure hydraulic cylinder travel two ends
Internal leakage.
At present, the internal leakage of a certain position in hydraulic cylinder travel is measured, method is that loaded hydraulic cylinder is certain
Piston is parked in the position for needing to measure internal leakage, such as patent CN202690588U, when being tested hydraulic cylinder generation leakage by weight
Calculate internal leakage by measuring the change in location of hydraulic cylinder piston rod, but this method of testing have ignored subject hydraulic cylinder due to
Fluid compression, seal extruding and piston position caused by hydraulic valve piece leakage change, and volume caused by this change in location becomes
The degree of accuracy of small internal leakage test can be had a strong impact on by changing, during simultaneously for measuring the internal leakage under different loads pressure, this
Device needs not stop to change load weight, thus, design one kind and can accurately be convenient for measuring in hydraulic cylinder arbitrary distance of run position and let out
The device of leakage quantity is extremely necessary.The present invention is using national standard GB/T15622-2005《Hydraulic cylinder test method》Middle loading cylinder water
Increase liquid level sensor, displacement transducer, fluid collection vessel on the basis of flat load testing machine to carry out arbitrary distance of run position
Internal leakage is accurately measured.
The content of the invention
It is micro- that present invention technical problem present in solution known technology provides a kind of hydraulic cylinder arbitrary distance of run position
Small internal leakage measuring method and its device.
A kind of small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position, is characterized in：Detection method is using loading
Cylinder horizontal addload experimental rig and liquid level sensor, the combination of displacement transducer, the liquid of detection subject hydraulic cylinder oil return line
The change in displacement signal of position variable signal and piston rod, two kinds of changing values is calculated as indirectly the volume changes value of hydraulic oil, and
Effective time by both volume differences divided by measurement is internal leakage value.
The small internal leakage measuring method in present hydraulic cylinder arbitrary distance of run position can also be adopted the following technical scheme that：
The described small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position, is characterized in：Liquid level change signal is Gather the signal of liquid level sensor to obtain by data collecting card, industrial computer, liquid level changes and effective in fluid collection vessel
The product of area obtains hydraulic oil Volume Changes, and this effective area is that fluid collection vessel sectional area detects pin with liquid level sensor
The difference of head sectional area, liquid level position when starting simultaneously at collection liquid level signal in fluid collection vessel has to flood liquid level biography
The position that sensor can be measured effectively.
The described small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position, is characterized in：Change in displacement signal is
Gather the signal of displacement transducer to obtain by data collecting card, industrial computer, the change in displacement of piston rod is multiplied by subject hydraulic pressure
Cylinder cavity area obtains hydraulic oil volume changes value, dead-center position and the hydraulic cylinder zero stroke position of simultaneous displacement sensor
Match somebody with somebody.
The described small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position, is characterized in：Pass through liquid level sensor
At the time of stopping rising with liquid level at the time of liquid level is flown up to record, the time interval between both moment is that measurement is effective
Time.
The described small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position, is characterized in：Give subject hydraulic cylinder work
Make after chamber test pressure, then start the collection of displacement signal and liquid level signal, wait after displacement signal and liquid level signal gather and terminate,
The test pressure of subject hydraulic cylinder is unloaded again, and produced error is extruded with seal because fluid compresses to eliminate.
A kind of small internal leakage measurement apparatus in hydraulic cylinder arbitrary distance of run position, is characterized in：Detection means includes loading
Cylinder horizontal addload experimental rig, liquid level sensor, fluid collection vessel, displacement transducer, electromagnetic relief valve, liquid level sensor connect
The oil return circuit of subject hydraulic cylinder is connect, displacement transducer is connected by hydraulic cylinder piston rod, and the oil return line of loading hydraulic cylinder connects electromagnetism
Overflow valve.
The small internal leakage measurement apparatus in present hydraulic cylinder arbitrary distance of run position can also be adopted the following technical scheme that：
The described small internal leakage measurement apparatus in hydraulic cylinder arbitrary distance of run position, is characterized in：Liquid level sensor is fixed
In fluid collection vessel, the fluid collection vessel other end is connected with being tested the oil return opening of hydraulic cylinder, the detection of liquid level sensor
Needle axis is alignd and perpendicular to ground with fluid collection vessel center line.
Advantages of the present invention is with beneficial effect：
The small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position and device employ new technical scheme, and existing
Technology is compared, the invention has the advantages that：1) internal leakage of hydraulic cylinder arbitrary distance of run position can be measured；2) can exclude due to
Fluid compression, seal extruding and hydraulic valve piece leakage measure the influence produced to hydraulic cylinder interior leakage leakage quantity；3) measuring accuracy is high.
The present invention can accurately measure the internal leakage of hydraulic cylinder, especially there is the micro- of local damage generation to Barrel of Hydraulic Cylinders inwall
Small internal leakage measurement.
Brief description of the drawings
Fig. 1 is the hydraulic system principle figure of the small internal leakage measurement in hydraulic cylinder arbitrary distance of run position.
Fig. 2 is the structural representation of the small internal leakage measurement apparatus in hydraulic cylinder arbitrary distance of run position.
Fig. 3 is the flow chart of signal data acquisition.
Description of symbols in accompanying drawing：1st, subject circuit electromagnetic reversal valve 2, stop valve 3, cylindrical tube 4, liquid level sensor 5,
Hydraulic cylinder 6, displacement transducer 7, loading hydraulic cylinder 8, check valve 9, loading loop solenoid directional control valve 10, electromagnetism is tested to overflow
Flow valve 11, bed stand 12, hydraulic fitting 13, support base 14, steel bar 15, adpting flange.
Embodiment
The present invention is elaborated with specific embodiment below in conjunction with the accompanying drawings.
Refering to accompanying drawing 1, Fig. 2 and Fig. 3.
Embodiment 1
A kind of small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position, using loading cylinder horizontal addload experimental rig
Coordinate displacement transducer 6, the combination of liquid level sensor 4, loading hydraulic cylinder 7 is fixed on testing stand platform with subject hydraulic cylinder 5
On frame 11, the oil return line of loading hydraulic cylinder 7 connects electromagnetic relief valve 10 to provide passive load, by detecting that subject hydraulic cylinder 5 is lived
The change of stopper rod position changes with liquid level in cylindrical tube 3, and the internal leakage for obtaining subject hydraulic cylinder in a period of time is calculated indirectly.
Liquid level change is to gather the signal of liquid level sensor 4 to obtain by data collecting card, industrial computer in detection cylindrical tube 3
Take, the product of liquid level change and effective area is the overall product value that hydraulic oil flows out in cylindrical tube 3 in cylindrical tube 3, and this is effective
Area is the difference of the sectional area of cylindrical tube 3 and the probe head sectional area of liquid level sensor 4.
The detection subject piston rod change in displacement of hydraulic cylinder 5 is to gather displacement transducer 6 by data collecting card, industrial computer
Signal is obtained, and the change in displacement of piston rod is multiplied by subject hydraulic cylinder effective area and obtains the generation of piston rod position minute movement
Hydraulic oil volume changes value.
Internal leakage measurement effective time recorded by liquid level sensor 4 at the time of liquid level is flown up with liquid level stop on
At the time of liter, the time interval between both moment is measurement effective time.
Liquid level sensor 4 measure hydraulic oil outflow in obtained cylindrical tube 3 cumulative volume subtract displacement transducer 6 measure by
The hydraulic oil Volume Changes produced in piston rod position minute movement, difference and the measurement effective time ratio of two volumes are
The internal leakage value of measurement.
Embodiment 2
A kind of small internal leakage measurement apparatus in hydraulic cylinder arbitrary distance of run position includes subject hydraulic cylinder 5, loading hydraulic cylinder
7th, adpting flange 15, support base 13, bed stand 11, displacement transducer 6, steel bar 14, cylindrical tube 3, liquid level sensor 4,
Hydraulic fitting 12, subject hydraulic cylinder 5, loading hydraulic cylinder 7 are fixed on bed stand 11 by support base 12, are tested hydraulic pressure
The piston rod head of cylinder 5 is connected by adpting flange 15 with loading hydraulic cylinder 7.
Support base 13 is vertically stood on bed stand 11, and subject hydraulic cylinder 5 passes through adpting flange with loading hydraulic cylinder 7
15 are fastened in support base 13, and the subject piston club head of hydraulic cylinder 5 is connected by adpting flange 15 with loading hydraulic cylinder 7
Connect, subject hydraulic cylinder 5 and the central axis of loading hydraulic cylinder 7 is alignd.
Displacement transducer 6 is fixed by screws in support base 13, and the joint of the bracing wire other end is fixed by screws in
On steel bar 14, the drilling of the other end of steel bar 14 is simultaneously fixed on piston rod head using bolt and adpting flange 15, makes displacement transducer 6
Bracing wire, piston rod center line and the centerline of steel bar 14 are in the same plane perpendicular to ground, and the bracing wire of displacement transducer 6 and work
Stopper rod center line is in this plane in parallel.
Liquid level sensor 4 is fixed in cylindrical tube 3, and the other end of cylindrical tube 3 is bound up with hydraulic fitting 12, hydraulic pressure
The oil-out of the other end of pipe joint 12 connection subject hydraulic cylinder 5, it is ensured that the center line of cylindrical tube 3, the center line of hydraulic fitting 12
Alignment, the probe head axis of liquid level sensor 4 aligns and perpendicular to ground with the center line of cylindrical tube 3.
Displacement transducer 6 measures the change for obtaining the subject piston rod displacement of hydraulic cylinder 5 by data collecting card, industrial computer
Signal, liquid level sensor 4 measures the variable signal for obtaining liquid level in cylindrical tube 3 by data collecting card, industrial computer.
The oil return line of loading hydraulic cylinder 7 installs electromagnetic relief valve 10 to simulate the load of subject hydraulic cylinder 5 to carry out internal leakage
Measurement, by setting the value of electromagnetic relief valve 10, promotes the power of loading hydraulic cylinder 7 to be more than the defeated of subject hydraulic cylinder 5 needed for making
Exert oneself.
The concrete operation step of the present embodiment：
The first step：The stroke of subject hydraulic cylinder 5 is adjusted by displacement transducer 6, being parked in the piston of subject hydraulic cylinder 5 needs
The pressure of electromagnetic relief valve 10 on the position of internal leakage, the regulation oil return line of loading hydraulic cylinder 7 is measured, what is formed it into is passive
Load is more than the power output of subject hydraulic cylinder 5, the initial level of measurement is flooded liquid level to some hydraulic oil are added in cylindrical tube 3
The probe head of sensor 4, starts pressure and holding that pump group provides design to subject hydraulic cylinder 5 rodless cavity.
Second step：Enabling signal capture program, starts collection displacement signal and liquid level signal, reaches the time of measuring of setting
Afterwards, first shutdown signal capture program, then gives the subject working chamber pressure release of hydraulic cylinder 5 again.
3rd step：Record the value H of the initial time of liquid level sensor 41, the record liquid level sensor 4 signal stopping collection moment
Value H2And corresponding signal acquisition time T, record the value S of the initial time of displacement transducer 61During with 6 end of displacement transducer
The value S at quarter2。
4th step：The signal collected is carried out calculating the internal leakage for obtaining being tested hydraulic cylinder 5 indirectly.Calculating obtains liquid
Potential difference Δ H=H2-H1, the displacement difference Δ S=S of effective time Δ T=T and the piston rod movement of signal acquisition2-S1, setting circle
A diameter of d of column jecket 31, a diameter of d of the probe head of liquid level sensor 42, calculate and obtain because liquid level changes the hydraulic oil produced
Change in volume Δ V1:
The subject internal diameter of cylinder of hydraulic cylinder 5 is set as D, diameter of piston rod is d, calculating obtains producing because piston rod position changes
Raw hydraulic oil change in volume Δ V2:
Convolution (1), formula (2) and measurement effective time Δ T, leakage rate Δ q is obtained by calculation formula：
The invention is not limited in above-mentioned two embodiment, can also there are the improvement or change of other forms, without departing from
The scope of the claims of the present invention, belongs to protection scope of the present invention.
Claims (6)
1. a kind of small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position, it is characterized in that：Measuring method is using loading cylinder
Horizontal addload experimental rig makes subject hydraulic cylinder rest on the optional position that internal leakage is detected, by liquid level sensor come collection liquid
Liquid level variable signal is pressed oil, piston rod change in displacement signal is gathered by displacement transducer, the liquid level collected is changed and believed
The volume changes value of hydraulic oil number is converted into change in displacement signal, the bulking value that liquid level signal conversion obtains is calculated and subtracts displacement
The bulking value that signal conversion is obtained, this difference divided by measurement effective time is obtained the internal leakage of hydraulic cylinder.
2. the small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position according to claim 1, it is characterized in that：Displacement
The volume changes value that change is produced is piston rod displacement signal variable quantity and the product of hydraulic cylinder cavity bulk area, and liquid level change is produced
Volume changes value for liquid level signal variable quantity and net sectional area product.
3. the small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position according to claim 1, it is characterized in that：Pass through
At the time of liquid level sensor stops rising at the time of liquid level is flown up to record with liquid level, the time interval between both moment is
For measurement effective time.
4. the small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position according to claim 1, it is characterized in that：First give
Hydraulic cylinder works cavity pressure is tested, then starts the collection of sensor signal, is waited after collecting sensor signal terminates, then unload subject
Hydraulic cylinder works cavity pressure, to eliminate because fluid compresses the measurement error caused by being extruded with seal.
5. the small internal leakage measuring method in hydraulic cylinder arbitrary distance of run position according to claim 1, it is characterized in that：Measurement
Liquid level position has to flood the position that liquid level sensor can be measured effectively in initial time, fluid collector.
6. a kind of small internal leakage measurement apparatus in hydraulic cylinder arbitrary distance of run position, it is characterized in that：Measurement apparatus includes loading cylinder
Horizontal addload experimental rig, fluid collection vessel, liquid level sensor, displacement transducer, liquid level sensor and fluid collection vessel
Installed in the oil return circuit of subject hydraulic cylinder；Liquid level sensor one end connects fluid collection vessel, the fluid collection vessel other end
Subject hydraulic cylinder oil return opening is connect, and fluid collection vessel center line is alignd and is hung down with the probe head center line of liquid level sensor
Directly in ground；The measurement apparatus is measured using following methods：Loading cylinder horizontal addload experimental rig makes subject hydraulic cylinder
The optional position of internal leakage detection is rested on, hydraulic oil liquid level variable signal is gathered by liquid level sensor, is passed by displacement
Sensor gathers piston rod change in displacement signal, and the liquid level variable signal that collects and change in displacement signal are converted into hydraulic oil
Volume changes value, calculate the obtained bulking value of liquid level signal conversion and subtract the bulking value that displacement signal conversion is obtained, by this
Difference divided by measurement effective time obtain the internal leakage of hydraulic cylinder.
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| CN106762946A (en) * | 2016-12-30 | 2017-05-31 | 河海大学常州校区 | A kind of single-action hydraulic cylinder shown with internal leakage |
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| CN106762947B (en) * | 2016-12-30 | 2018-05-18 | 河海大学常州校区 | A kind of single-action hydraulic cylinder shown with internal leakage |
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