CN103133458A - Internal leakage quantity detection device of hydraulic valves - Google Patents

Internal leakage quantity detection device of hydraulic valves Download PDF

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Publication number
CN103133458A
CN103133458A CN2011104038911A CN201110403891A CN103133458A CN 103133458 A CN103133458 A CN 103133458A CN 2011104038911 A CN2011104038911 A CN 2011104038911A CN 201110403891 A CN201110403891 A CN 201110403891A CN 103133458 A CN103133458 A CN 103133458A
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CN
China
Prior art keywords
container
internal leakage
transmitter
chip microcomputer
weighing sensor
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Granted
Application number
CN2011104038911A
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Chinese (zh)
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CN103133458B (en
Inventor
余忠华
陆彬
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN201110403891.1A priority Critical patent/CN103133458B/en
Publication of CN103133458A publication Critical patent/CN103133458A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/28Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2876Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves

Abstract

The invention discloses an internal leakage quantity detection device of hydraulic valves. The internal leakage quantity detection device comprises a test bench (3), a support (5), a container (11), an oil inlet pipe (12), an oil outlet pipe (9), a funnel (8), a weighing sensor (7), a transmitter (6), a single-chip microcomputer system (4), a display module (1), a two-position two-way magnetic exchange valve (10) and a button (2). The inlet of the container enables leaked hydraulic oil leaked inside tested hydraulic valves to be stored inside the container (11) which is placed on the weighing sensor (7), the weighing sensor (7) and the transmitter (6) are placed on the support (5), weight of the leaked oil is converted into an electric signal through the weighing sensor (7) and the transmitter (6), the electric signal is converted into a digital signal through analog to digital (A/D) conversion, the digital signal is input into a single chip microcomputer and converted into internal leakage quantity through the single chip microcomputer, and the internal leakage quantity is displayed through the display module (1). The container (11) is specially provided with an outlet controlled by the magnetic exchange valve (10) to prevent the hydraulic oil from overflowing out of the container (11) during a measurement process, actual capacity of the container is measured through the single chip microcomputer, once the actual capacity exceeds the threshold value, measurement is stopped, the magnetic exchange valve (10) is opened through a relay, and the hydraulic oil inside the container (11) is discharged. The internal leakage quantity detection device measures the internal leakage quantity of hydraulic valves in an automatic weighing mode, can expand measurement range, can automatically measure minute leakage quantity, and can provide data basis for comprehensive assessment and performance improvement of batch quality of hydraulic valves.

Description

A kind of internal leakage detection device of hydrovalve
Technical field
The present invention relates to the hydrovalve field tests, particularly a kind of internal leakage detection device of hydrovalve.
Background technique
Hydraulic transmission is the kind of drive of coming transferring energy and controlling as working medium with liquid, and it is a special kind of skill of widely using in industrial and agricultural production, and the height of hydraulic transmission technology level has become the important symbol of a national Industry Development Level.Hydrovalve is the element that is used for controlling fluid pressure, flow and direction in hydraulic system, comprises pressure controlled valve, flow control valve and position control valve.The quality testing of hydrovalve has important meaning for the accuracy, rapidity, the stability that guarantee whole hydraulic system.Each hydrovalve must carry out strict test to its parameter by various means before dispatching from the factory, check its performance whether to reach related request, wherein just comprises the internal leakage test.At present, the internal leakage test method one of hydrovalve is the number that drips of manual record leakage fluid, then be converted to a milliliter number, perhaps collect with measuring cup and measure, this test method exists and is affected by human factors the shortcomings such as large, that test efficiency is low, is difficult to satisfy the requirement of the automation quality testing in enormous quantities of hydrovalve; The 2nd, record flow value by flow transducer, then calculate the leakage value, it is very low that, the small flow little but problem of this mode is present flow transducer is difficult to the degree of accuracy of measuring or measuring, and can't satisfy the requirement that range ability is large, measuring accuracy is high.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, a kind of internal leakage detection device of hydrovalve is provided, can realize automatic collection and the analysis of test data, improve the efficient of the internal leakage measurement of hydrovalve, increase range ability and the accuracy of measurement results automatically measured, and can automatically show test results, can be comprehensive evaluation of hydrovalve quality of lot and research and development and the later stage improvement in performance of hydrovalve the data foundation is provided.
For achieving the above object, the present invention adopts following technological scheme: a kind of internal leakage detection device of hydrovalve comprises testboard bay, support, container, oil inlet pipe, oil outlet tube, funnel, weighing sensor, transmitter, SCM system, display modular, bi-bit bi-pass solenoid directional control valve and button.
Described weighing sensor and transmitter are placed on support, and weighing sensor is connected with transmitter; Described container is placed on weighing sensor, can realize weighing to container by weighing sensor, container bottom has an oil outlet, be connected with oil outlet tube, this oil pipe is equipped with a bi-bit bi-pass solenoid directional control valve in order to control the keying of this oil circuit, makes the fluid in container be back to the test fuel tank through funnel; The leakage hole of the one tested valve of termination of described oil inlet pipe, the other end are placed in above container, make the fluid that the tested liquid pressure valve is leaked enter container; Described display modular is used for carrying out the demonstration of test result; Described button is used for the start and stop of control single chip computer system.Described SCM system comprises single-chip microcomputer, A/D converter, clock module, data memory module, relay and warning light; Wherein said single-chip microcomputer is connected with A/D converter, data memory module, clock module, relay, warning light, display modular and button; Wherein said A/D converter is connected with transmitter with single-chip microcomputer, is used for changing electrical signal into digital signal; Wherein said data memory module is used for store data; Wherein said clock module is used for obtaining system time; Wherein said relay is connected with the bi-bit bi-pass solenoid directional control valve, is used for controlling the action of bi-bit bi-pass solenoid directional control valve; Wherein said warning light is used for producing alarm signal after fluid weight surpasses threshold value.
Compared with prior art, the present invention has following advantage:
1) automaticity is high, range ability is large
Due to the data acquistion system that has adopted weighing sensor, transmitter and SCM system to form, realized that small internal leakage is measured and the automatic collection of data;
2) measurement result accurately, reliably
Owing to adopting high-precision counterweight to carry out the demarcation of weighing sensor, for weighing system provides accurate measurement standand; The sensitivity of weighing sensor and transmitter simultaneously is very high, can detect small changes in weight; On the other hand, owing to having adopted the method that threshold value is set for weighing sensor to carry out the judgement whether internal leakage overflows, make at internal leakage excessive and still can guarantee the accurately reliable of data when surpassing vessel volume;
3) flexible high
The measuring system that the present invention adopts goes for the internal leakage test of various hydrovalves, has very high flexibility.
Description of drawings
Fig. 1 is product structure schematic diagram of the present invention;
Fig. 2 is product data collection of the present invention and control system schematic diagram;
Fig. 3 is working procedure flow chart of the present invention;
In figure: 1, display modular; 2, button; 3, test-bed; 4, SCM system; 5, support; 6, transmitter; 7, weighing sensor; 8, funnel; 9, oil outlet tube; 10, bi-bit bi-pass solenoid directional control valve; 11, container; 12, oil inlet pipe; 41, single-chip microcomputer; 42, A/D converter; 43, data memory module; 44, clock module; 45, relay; 46, warning light.
Embodiment
The product structure schematic diagram of the internal leakage detection device of a kind of hydrovalve of the present invention comprises testboard bay (3), support (5), container (11), oil inlet pipe (12), oil outlet tube (9), funnel (8), weighing sensor (7), transmitter (6), SCM system (4), display modular (1), bi-bit bi-pass solenoid directional control valve (10) and button (2) as shown in Figure 1.Described weighing sensor (7) and transmitter (6) are placed on support (5), and weighing sensor (7) is connected with transmitter (6), and transmitter can adopt the XL-A2P type; Described container (11) is placed on support (5), can be realized the weighing of container (11) by weighing sensor (7) and transmitter (6), and be converted to electrical signal; One oil outlet is arranged at container (11) bottom, be connected with oil outlet tube (9), this oil pipe is equipped with a bi-bit bi-pass solenoid directional control valve (10) in order to control the keying of this oil circuit, make fluid be back to the test fuel tank through funnel (8), the range of container (11) can be selected as the test period of condition query relevant criterion and expection according to nominal pressure and latus rectum take tested valve, then selects the range of corresponding weighing sensor (7) according to the range of selected container (11); The leakage hole of the one tested valve of termination of described oil inlet pipe (12), the other end are placed in above container (11), make from oil inlet pipe (12) oil out and can enter container (11); Described display modular (1) is used for carrying out the demonstration of test result; Described button (2) is used for the start and stop of control single chip computer system (4).
The SCM system schematic diagram of the internal leakage detection device of a kind of hydrovalve of the present invention as shown in Figure 2, described SCM system (4) comprises single-chip microcomputer (41), A/D converter (42), data memory module (43), clock module (44), relay (45) and warning light (46).
Wherein said A/D converter (42) is connected 6 with single-chip microcomputer (41) with transmitter) be connected, be used for changing electrical signal into digital signal; Wherein said data memory module (43) is used for store data; Wherein said clock module (44) is used for obtaining system time; Wherein said relay (45) is connected with bi-bit bi-pass solenoid directional control valve (10), is used for controlling the action of bi-bit bi-pass solenoid directional control valve (10); Wherein said warning light is used for producing alarm signal after fluid weight surpasses threshold value; Wherein said single-chip microcomputer (41) is connected with A/D converter (42), data memory module (43), clock module (44), relay (45), warning light (46), display modular (1) and button (2).
Working principle of the present invention is as follows:
Calibration principle: before test, need first weighing sensor and the density of testing hydraulic oil used are demarcated, the step of demarcating is: empty is placed on weighing sensor, the zero-bit of pressing on transmitter is regulated button, and then loading is equivalent to the standard test weight of total weighing, the range of pressing after loading on transmitter is regulated button, completes the demarcation of weighing sensor; The calibration process of hydraulic oil density is: measure by measuring cup the hydraulic oil that volume is V, bulking value should be not too small, and hydraulic oil is added in container, and then single-chip microcomputer records the gravimetric value that adds container before and after hydraulic oil by weighing sensor, is designated as respectively m 0, m 1, single-chip microcomputer is then by formula ρ=(m afterwards 1-m 0)/V calculates the density value ρ of hydraulic oil, and unit is g/mL.
Test principle: after demarcating end, begin to test, the user is installed to testing position with tested hydrovalve, then make flow reach the desired flow of test, pressure increases to nominal pressure gradually by zero, set several measuring points therebetween, measure successively respectively the internal leakage of each set point, the internal leakage testing procedure of each set point is as follows:
On-load pressure is to set point pressure, and presses start button, and single-chip microcomputer is received after this signal by cut-off bi-bit bi-pass solenoid directional control valve, and single-chip microcomputer reads gravimetric value and the time of first data, is designated as m 0, t 0, the fluid of leakage is flowed in container, single-chip microcomputer continues to read the data of weighing sensor and transmitter, the data that collect are carried out the A/D conversion, and the data writing memory module, single-chip microcomputer reads gravimetric value and the time of front last data of off-test, is designated as m 1, t 1, single-chip microcomputer calculates the internal leakage of this hydrovalve afterwards, and formula is q=(m 1-m 0)/(ρ * (t 1-t 0)), unit is mL/min, m in formula 1-m 0For leaking the weight of fluid, t 1-t 0Be duration of test runs, the density of the hydraulic oil that ρ demarcates before being; Test result shows by display modular; Carry out afterwards the internal leakage test of next set point, if be the internal leakage test under nominal pressure, after this test is completed, off-test.
Overflow the judgement principle: because the excessive volume that has surpassed container of internal leakage of tested hydrovalve produces the situation that fluid overflows, according to the test period of vessel volume and expection, a threshold value m is set for preventing in SCM program 2If in test, fluid weight does not reach this value, after reaching the test period of expection, presses stop button, off-test.When if fluid weight reaches this threshold value, trigger a signal, warning light is reported to the police, need temporarily stop during this period test, the time that single-chip microcomputer reads this moment is t 1(also stay in oil inlet pipe owing to also having the remaining fluid of part, therefore should wait until that the fluid in oil inlet pipe flows in container), weighing sensor and transmitter still constantly gather weight data, when these data reach within a period of time when stablizing, illustrate that the fluid in oil inlet pipe this moment all flows into container, single-chip microcomputer reads the weight of this moment, is designated as m 1Then single-chip microcomputer is opened solenoid directional control valve by relay, make fluid be back to the test fuel tank by oil outlet tube and funnel, this moment, weighing sensor and transmitter still constantly gathered weight data, when these data reach when stablizing, illustrate that the fluid in container this moment all is back to the test fuel tank through funnel within a period of time; Proceed afterwards internal leakage test, this moment gravimetric value and the time of first data that single-chip microcomputer reads by weighing sensor and transmitter are designated as respectively m 3, t 3, after the test period that reaches expection, press stop button, off-test, gravimetric value and the time of last data that reads before off-test are respectively m 4, t 4After off-test, single-chip microcomputer carries out the calculating of leakage rate according to the data in data memory module, and formula is q=(m 1-m 0+ m 4-m 3)/(ρ * (t 1-t 0+ t 4-t 3)), unit is mL/min, m in formula 1-m 0For tested valve before overflow alarm at t 1-t 0The weight of tested valve internal leakage fluid in time, m 4-m 3For the fluid in amount discharge container and after proceeding test, at t 4-t 3The weight of tested valve internal leakage fluid in time, sum is the weight of total leakage fluid, t 1-t 0+ t 4-t 3Be total testing time, the density of the hydraulic oil that ρ demarcates before being; Test result shows by display modular.
Working procedure flow chart of the present invention the steps include: as shown in Figure 3
1) program initialization
After the user is installed to testing position with hydrovalve, make flow reach the desired flow of test, on-load pressure is to first set point, afterwards the open system power supply, single-chip microcomputer carries out a series of initial work, comprises the initial work of state variable and numerical value in each register.
2) on-test
After program initialization, whether the detection user that single-chip microcomputer begins to circulate has instruction input, after the user being detected and pressing start button, closes the bi-bit bi-pass solenoid directional control valve, begins simultaneously the internal leakage test, and the fluid of leakage can be entered in container.
3) Data acquisition and storage
The weight that weighing sensor and transmitter will leak fluid converts electrical signal to, and converts digital signal to through A/D, is input to single-chip microcomputer, and the data writing memory module.
4) overflow judgement
For preventing producing because of the excessive volume that has surpassed container of leakage rate of hydrovalve the situation that fluid overflows, according to the test period of vessel volume and expection, a threshold value is set in SCM program, if in test, fluid weight does not reach this value, after reaching the test period of expection, press stop button, off-test.when if fluid weight reaches this threshold value, trigger a signal, warning light is reported to the police, need temporarily stop during this period test (also stays in oil inlet pipe owing to also having part fluid, therefore should wait until that the fluid in oil pipe flows in container), weighing sensor and transmitter still constantly gather weight data, when these data reach within a period of time when stablizing, illustrate that the fluid in oil inlet pipe this moment all flows into container, then single-chip microcomputer is opened solenoid directional control valve by relay, make fluid be back to the test fuel tank by oil outlet tube and funnel, weighing sensor and transmitter still constantly gather weight data, when these data reach within a period of time when stablizing, illustrate that this moment, fluid all was back to the test fuel tank by oil outlet tube and funnel, proceed afterwards test, after the test period that reaches expection, press stop button, off-test.
5) test result shows
Single-chip microcomputer carries out the calculating of leakage rate according to the data in data memory module, and test result is shown by display modular.
6) test is proceeded
On-load pressure repeats above step to next set point, until complete the internal leakage test of all set points.

Claims (4)

1. the internal leakage detection device of a hydrovalve, is characterized in that comprising testboard bay (3), support (5), container (11), oil inlet pipe (12), oil outlet tube (9), funnel (8), weighing sensor (7), transmitter (6), SCM system (4), display modular (1), bi-bit bi-pass solenoid directional control valve (10) and button (2).Weighing sensor (7) and transmitter (6) are placed in (5) on support, and weighing sensor (7) is connected with transmitter (6); Button (2) is used for the start and stop of control single chip computer system (4); SCM system (4) comprises single-chip microcomputer (41), A/D converter (42), data memory module (43), clock module (44), relay (45), warning light (46); Single-chip microcomputer (41) is connected with A/D converter (42), data memory module (43), clock module (44), relay (45), warning light (46), display modular (1) and button (2); A/D converter (42) is connected 6 with single-chip microcomputer (41) with transmitter) be connected; Relay (45) is connected with bi-bit bi-pass solenoid directional control valve (10), is used for controlling the action of bi-bit bi-pass solenoid directional control valve (10); Warning light (46) is used for producing alarm signal when leakage rate reaches threshold value.
2. the internal leakage detection device of a kind of hydrovalve according to claim 1, it is characterized in that described weighing sensor (7), transmitter (6), support (5) and container (11) form weighing system, container (11) is placed on the weight that to measure container (10) on weighing sensor (7), and can be converted to electrical signal by transmitter (6), convert digital signal to through A/D again, be input to single-chip microcomputer, calculate internal leakage by single-chip microcomputer by formula again, and show by display modular (1).
3. the internal leakage detection device of a kind of hydrovalve according to claim 1, there is an oil outlet below that it is characterized in that described container (11), be connected with oil outlet tube (9), this oil pipe is equipped with a bi-bit bi-pass solenoid directional control valve (10) in order to control the keying of this oil circuit.
4. the internal leakage detection device of a kind of hydrovalve according to claim 1, the leakage hole that it is characterized in that a tested valve of termination of described oil inlet pipe (12), the other end is placed in above container, and a bi-bit bi-pass solenoid directional control valve (10) is housed on it.
CN201110403891.1A 2011-12-02 2011-12-02 A kind of internal leakage detecting device of hydraulic valve Expired - Fee Related CN103133458B (en)

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CN103133458B CN103133458B (en) 2016-06-22

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN104849001A (en) * 2015-06-09 2015-08-19 国网山东济南市历城区供电公司 Monitoring alarm device and method for oil leakage of transformer
CN109026845A (en) * 2017-06-12 2018-12-18 上海梅山钢铁股份有限公司 Blower stator blade adjusts hydraulic device Oil Leakage Detecting and protective device
CN109442226A (en) * 2018-10-25 2019-03-08 中国石油大学(北京) Simulate the device of liquid hydrocarbon pipe leakage and the method using device measuring and calculating leakage rate

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CN201716155U (en) * 2010-04-04 2011-01-19 苏州宝骅机械技术有限公司 Sealing property detector for sealing parts
CN202483989U (en) * 2011-12-02 2012-10-10 浙江大学 Internal leakage rate detection device for hydraulic valve

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CN1687731A (en) * 2005-04-30 2005-10-26 武汉理工大学 Equipment for testing valve performance of oil fuel pump
CN101657701A (en) * 2007-02-19 2010-02-24 布鲁克斯器具有限公司 valve leakby diagnostics
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CN109442226A (en) * 2018-10-25 2019-03-08 中国石油大学(北京) Simulate the device of liquid hydrocarbon pipe leakage and the method using device measuring and calculating leakage rate

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