CN102865271A - Detection method and device of internal leakage of hydraulic valve - Google Patents
Detection method and device of internal leakage of hydraulic valve Download PDFInfo
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- CN102865271A CN102865271A CN2012103679763A CN201210367976A CN102865271A CN 102865271 A CN102865271 A CN 102865271A CN 2012103679763 A CN2012103679763 A CN 2012103679763A CN 201210367976 A CN201210367976 A CN 201210367976A CN 102865271 A CN102865271 A CN 102865271A
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Abstract
The invention relates to a detection method and device of internal leakage of a hydraulic valve and belongs to the technical field of leakage detection. The detection method of the internal leakage of the hydraulic valve comprises the following steps of: adopting a combined manner of a hydraulic oil cylinder and a displacement sensor, connecting the hydraulic oil cylinder and a tested hydraulic valve with a test pipeline, converting and calculating the leakage volume of the tested hydraulic valve in a certain period of time by detecting the displacement of a piston of the hydraulic oil cylinder, and detecting the internal leakage of the hydraulic valve. The detection device of the internal leakage of the hydraulic valve comprises an experiment bench, a bidirectional-unidirectional magnetic exchange valve, a magnetic exchange valve and the hydraulic oil cylinder, wherein the test pipeline is arranged on the experiment bench and connected with the bidirectional-unidirectional magnetic exchange valve and the magnetic exchange valve, the hydraulic oil cylinder is connected with the test pipeline, a piston rod of the hydraulic oil cylinder is connected with the displacement sensor, and an tested hydraulic valve interface is arranged on the test pipeline. The detection apparatus of the internal leakage of the hydraulic valve has the advantages of simple structure, quick detection, lower cost, higher precision and high working efficiency. The method and the device are suitable for testing of pressure valves, direction valves, multipath valves, flow valves and the like.
Description
Technical field
The invention belongs to the leak detection technology field, particularly relate to a kind of detecting method and device thereof of hydrovalve internal leakage.
Background technique
At present, along with the development of hydraulics, to the sealing propertytest of hydrovalve, the demand that the detection of the internal leakage of valve, the particularly dynamic test of highi degree of accuracy small flow are used in modern industry is more and more.Existing hydrovalve internal leakage detection technique means, the mode that generally adopts flowmeter directly to measure because the internal leakage of some hydrovalve is very little, select the high-precision flowmeter price comparison of small flow expensive, and contamination resistance is relatively poor, not easy-maintaining and replacing.Add the leakage of pilot system itself, have the technical problems such as accuracy, testing cost and detection efficiency of measuring.
Summary of the invention
The present invention provides a kind of detecting method and device thereof of hydrovalve internal leakage for solving the technical problem that exists in the known technology.
It is quick that one of purpose of the present invention provides a kind of detection, and easy to operate, cost is lower, and precision is higher, and is economical and practical, the detecting method of the hydrovalve internal leakage of the characteristics such as safety and stability and working efficiency height.
The present invention adopts the combination of self-control hydraulic jack and displacement transducer, by detecting the displacement of oil cylinder piston, thereby calculates the leakage rate of tested valve in a period of time by converting.Computer gathers the signal of displacement transducer, pressure transducer through calculating by integrated circuit board, draw out the curve of tested valve internal leakage under certain pressure.
The technological scheme that the detecting method of hydrovalve internal leakage of the present invention is taked is:
A kind of detecting method of hydrovalve internal leakage, be characterized in: detecting method adopts hydraulic jack and displacement transducer compound mode, in hydraulic jack and the tested hydrovalve access test pipeline, by detecting the displacement of hydraulic cylinder piston, Conversion Calculation goes out the leakage rate of tested hydrovalve in a period of time, carries out the detection of hydrovalve internal leakage.
The detecting method of hydrovalve internal leakage of the present invention can also adopt following technological scheme:
The detecting method of described hydrovalve internal leakage is characterized in: when detecting the displacement of hydraulic cylinder piston, adopt computer to obtain by the calculated signals that integrated circuit board gathers displacement transducer.
The detecting method of described hydrovalve internal leakage, be characterized in: computer gathers the signal of displacement transducer by integrated circuit board, after calculating the displacement that detects hydraulic cylinder piston, be installed in the signal of testing pressure transducer in the pipeline with simultaneously collection, go out the curve of tested hydrovalve internal leakage under certain pressure through calculating and plotting.
Two of purpose of the present invention provides a kind of simple in structure, and cost is lower, and precision is higher, and is economical and practical, the detection device of the hydrovalve internal leakage of the characteristics such as safety and stability and working efficiency height.
The technological scheme that the detection device of hydrovalve internal leakage of the present invention is taked is:
A kind of detection device of hydrovalve internal leakage, be characterized in: detection device comprises experimental stand, two unidirectional solenoid directional control valve, solenoid directional control valve and hydraulic jack, there is the test pipeline to connect two unidirectional solenoid directional control valves and solenoid directional control valve on the experimental stand, hydraulic jack is communicated with the test pipeline, hydraulic cylinder piston rod connecting position displacement sensor, the test pipeline is provided with tested hydrovalve interface.
The detection device of hydrovalve internal leakage of the present invention can also adopt following technological scheme:
The detection device of described hydrovalve internal leakage is characterized in: the test pipeline is equipped with pressure transducer, and pressure transducer is connected computer with displacement transducer.
The detection device of described hydrovalve internal leakage is characterized in: displacement transducer is installed on the cylinder barrel top of hydraulic jack, and sensor bar is connected to hydraulic cylinder piston rod.
The detection device of described hydrovalve internal leakage is characterized in: the test pipeline is equipped with one-way valve and relief valve.
Advantage and good effect that the present invention has are:
The detecting method of hydrovalve internal leakage and device thereof are owing to having adopted the brand-new technological scheme of the present invention, and compared with prior art, the present invention has simple in structure, detect fast, easy to operate, cost is lower, precision is higher, and is economical and practical, the advantages such as safety and stability and working efficiency height.Especially be applicable to the detection of the hydrovalve internal leakage of less leakage rate, can be widely used in the test of the hydrovalve internal leakages such as pressure valve, directional control valve, multi-way valve, Flow valve.
Description of drawings
Fig. 1 is the detection principle schematic of hydrovalve internal leakage;
Fig. 2 is hydraulic jack mounting structure schematic diagram.
Among the figure, 1, tested hydrovalve; 2, two unidirectional solenoid directional control valves; 3, relief valve; 4, solenoid directional control valve; 5, one-way valve; 6, pressure transducer; 7, hydraulic jack; 7.1, cylinder barrel; 7.2, piston rod; 7.3, rotationally fixed bearing; 7.4, displacement transducer; 7.5, piston; 7.6, the piston combined seal ring; 7.7, the piston rod combined seal ring; 7.8, the piston rod Y-shaped ring; 7.9, filler opening; 7.10, remove tested hydrovalve; 8, displacement transducer.
Embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and cooperate accompanying drawing to be described in detail as follows:
Consult accompanying drawing 1 and Fig. 2.
Embodiment 1
A kind of detecting method of hydrovalve internal leakage, adopt hydraulic jack 7 and displacement transducer 8 compound modes, in hydraulic jack 7 and the tested hydrovalve 1 access test pipeline, by detecting the displacement of hydraulic jack 7 pistons, Conversion Calculation goes out the leakage rate of tested hydrovalve 1 in a period of time, carries out the detection of hydrovalve internal leakage.
When detecting the displacement of hydraulic jack 7 pistons, adopt computer to obtain by the calculated signals that integrated circuit board gathers displacement transducer 8.After calculating the displacement that detects hydraulic jack 7 pistons, be installed in the signal of testing pressure transducer 6 in the pipeline with simultaneously collection, go out the curve of tested hydrovalve 1 internal leakage under certain pressure through calculating and plotting.
A kind of detection device of hydrovalve internal leakage, comprise experimental stand, two unidirectional solenoid directional control valve 2, solenoid directional control valve 4 and hydraulic jack 7, there is the test pipeline to connect two unidirectional solenoid directional control valves 2 and solenoid directional control valve 4 on the experimental stand, hydraulic jack 7 is communicated with the test pipeline, displacement transducer 8 is installed on the cylinder barrel top of hydraulic jack 7, and the displacement sensor sensor bar is connected to oil hydraulic cylinder 7 piston rods.The test pipeline is equipped with one-way valve 5 and relief valve 3.The test pipeline is provided with tested hydrovalve 1 interface.
The test pipeline is equipped with pressure transducer 6, and pressure transducer 6 is connected with displacement transducer and is connected computer.
The principle of the present embodiment and concrete structure course of action:
Detect principle: pressure oil is through two-position four-way solenoid directional control valve 4, can control hydraulic jack 7 piston side-to-side movements, piston rod is connected with displacement transducer 8, and keeps being synchronized with the movement, and the motion of sensor detection hydraulic cylinder piston and output voltage signal 0～5V are to the computer data acquiring card.One filler opening of oil cylinder connects one-way valve 5, and two unidirectional solenoid directional control valve 2, the one-way valve assurance enters the pressure oil of tested valve when testing zero leakage.Two unidirectional solenoid directional control valves 2 are used for the test that system self leaks.Tested valve inlet connects pressure transducer 6, guarantees real-time and the accuracy measured.System pressure is set up by relief valve 3.
Be to guarantee measurement accuracy, must make surface friction drag and the frictional force between piston rod and the guide sleeve between piston and the cylinder barrel should be as much as possible little.So hydraulic cylinder piston and piston rod adopt the combination seal form of "O"-ring and slip ring group, the slip ring material adopts filled polytetrafluoroethylene or polytetrafluoro, and this combined sealing structure has good sealability and docile characteristics, and surface friction drag is little.The two ends piston rod is with the seal ring outside one group of employing " Y " type circle sealing configuration in addition, can effectively control to leak outside.In addition, piston adopts two rod homalographic pistons, and oil hydraulic cylinder left and right sides cavity pressure is equated, nothing is leaked between two chambeies of assurance oil hydraulic cylinder.For preventing that piston rod from producing rotation in movement process, in piston rod end and sensor joint rolling bearing is installed, guaranteed the accuracy of sensor displacement.
Each valve and testing hydraulic oil cylinder 7 mainly are installed on the experimental stand in the above-mentioned schematic diagram, wherein displacement transducer 8 is installed on the top of hydraulic jack, as shown in Figure 2, each hydraulic fluid port is interconnected by pipeline, with tested valve connecting system, whole like this test system has just connected at last.Make the electromagnet of two unidirectional solenoid directional control valves 2 and two-position four-way solenoid directional control valve 4 all be in off-position, pressure oil enters testing hydraulic oil cylinder 7 left chambeies, makes hydraulic cylinder piston be in low order end, and regulation relief valve pressure is a little more than the required force value of tested valve.At this moment, solenoid directional control valve 4 electromagnet get electric, hydraulic oil enters the right chamber of hydraulic pressure hydraulic cylinder, pushing piston drives displacement transducer 8 to left movement, because oil outlet place, right chamber is connected to one-way valve 5, oil cylinder piston is almost motionless, but does not have in theory absolute leak free valve, has slightly moved small displacement S to the right so piston still can drive displacement transducer 8
0, the sectional area of establishing piston is A, the test time is t, like this leakage rate Q of system self
0=A * Δ S
0/ t, the below begin the internal leakage of tested valve is detected, and two unidirectional solenoid directional control valve 2 electromagnet are got electric, and pressure oil enters tested valve, record the displacement S that lower piston drives displacement transducer after stable
1, and same time t, at this moment the leakage rate Q of system and tested valve
1=A * Δ S
1/ t, then the internal leakage of tested valve itself is Q
1-Q
0, the leakage oil of tested valve flows back to fuel tank by return line.Tested valve inlet establishes pressure transducer 6, and computer is drawn out tested valve internal leakage curve under certain pressure by the data that gather displacement transducer.
Claims (7)
1. the detecting method of a hydrovalve internal leakage, it is characterized in that: detecting method adopts hydraulic jack and displacement transducer compound mode, in hydraulic jack and the tested hydrovalve access test pipeline, by detecting the displacement of hydraulic cylinder piston, Conversion Calculation goes out the leakage rate of tested hydrovalve in a period of time, carries out the detection of hydrovalve internal leakage.
2. the detecting method of hydrovalve internal leakage according to claim 1 is characterized in that: when detecting the displacement of hydraulic cylinder piston, adopt computer to obtain by the calculated signals that integrated circuit board gathers displacement transducer.
3. the detecting method of hydrovalve internal leakage according to claim 2, it is characterized in that: computer gathers the signal of displacement transducer by integrated circuit board, after calculating the displacement that detects hydraulic cylinder piston, be installed in the signal of testing pressure transducer in the pipeline with simultaneously collection, go out the curve of tested hydrovalve internal leakage under certain pressure through calculating and plotting.
4. the detection device of a hydrovalve internal leakage, it is characterized in that: detection device comprises experimental stand, two unidirectional solenoid directional control valve, solenoid directional control valve and hydraulic jack, there is the test pipeline to connect two unidirectional solenoid directional control valves and solenoid directional control valve on the experimental stand, hydraulic jack is communicated with the test pipeline, hydraulic cylinder piston rod connecting position displacement sensor, the test pipeline is provided with tested hydrovalve interface.
5. the detection device of hydrovalve internal leakage according to claim 4 is characterized in that: the test pipeline is equipped with pressure transducer, and pressure transducer is connected computer with displacement transducer.
6. according to claim 4 or the detection device of 5 described hydrovalve internal leakages, it is characterized in that: displacement transducer is installed on the cylinder barrel top of hydraulic jack, and sensor bar is connected to hydraulic cylinder piston rod.
7. it is characterized in that according to claim 4 or the detection device of 5 described hydrovalve internal leakages: the test pipeline is equipped with one-way valve and relief valve.
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| CN2012103679763A CN102865271A (en) | 2012-09-28 | 2012-09-28 | Detection method and device of internal leakage of hydraulic valve |
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| CN2012103679763A CN102865271A (en) | 2012-09-28 | 2012-09-28 | Detection method and device of internal leakage of hydraulic valve |
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| CN105465101A (en) * | 2014-10-23 | 2016-04-06 | 徐州重型机械有限公司 | Internal leakage detection equipment and device for hydraulic oil cylinder |
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Application publication date: 20130109 |