CN103133458B - A kind of internal leakage detecting device of hydraulic valve - Google Patents
A kind of internal leakage detecting device of hydraulic valve Download PDFInfo
- Publication number
- CN103133458B CN103133458B CN201110403891.1A CN201110403891A CN103133458B CN 103133458 B CN103133458 B CN 103133458B CN 201110403891 A CN201110403891 A CN 201110403891A CN 103133458 B CN103133458 B CN 103133458B
- Authority
- CN
- China
- Prior art keywords
- chip microcomputer
- container
- transmitter
- load cells
- internal leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating 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
- G01M3/28—Investigating 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
- G01M3/2876—Investigating 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 the internal leakage detecting device of a kind of hydraulic valve, including testboard bay, support, container, oil pipe, funnel, LOAD CELLS/transmitter, Single Chip Microcomputer (SCM) system, display module, solenoid directional control valve and button。By container entrance, the hydraulic oil reservoir let out in hydraulic valve is deposited in a reservoir, container is placed in equipped with on the support of LOAD CELLS, be will leak out the weight of oil by LOAD CELLS/transmitter and convert the signal of telecommunication to, and convert digital signal to through A/D, it is input to single-chip microcomputer, it is converted into internal leakage again, and is shown by display module；For preventing hydraulic oil from overflowing, it is provided with the outlet that electromagnetic valve controls, single-chip microcomputer calculates its actual capacity, once exceed its threshold value, will pass through relay and making electromagnetic valve open, amount discharge container fluid。The present invention measures the internal leakage of hydraulic valve automatically by weighting manner, and certainty of measurement is high, can evaluate for the quality of lot of hydraulic valve, the research and development of hydraulic valve and performance improvement are offered help。
Description
Technical field
The present invention relates to hydraulic valve field tests, particularly to the internal leakage detecting device of a kind of hydraulic valve。
Background technology
Hydraulic drive is to transmit energy and the kind of drive being controlled with liquid as working media, and it is a special kind of skill widely used in industrial and agricultural production, and the height of hydraulic transmission technology level has become the important symbol of a National Industrial level of development。Hydraulic valve is for controlling the element in fluid pressure, flow and direction in hydraulic system, including pressure-control valve, flow control valve and directional control valve。The quality testing of hydraulic valve is for ensureing that the accuracy of whole hydraulic system, rapidity, stability have important meaning。Each hydraulic valve must flow through various means before dispatching from the factory and its parameter carried out strict test, checks whether its performance reaches related request, wherein just includes internal leakage test。At present, the internal leakage test method one of hydraulic valve is that dripping of manual record leakage fluid counts, it is then converted into a milliliter number, or collect measurement with measuring cup, this test method also exists and is affected by human factors the shortcomings such as big, test efficiency is low, it is difficult to meet the requirement of the high-volume automatization quality testing of hydraulic valve；Two is recorded flow value by flow transducer, then it is calculated obtaining leakage value, but this mode has a problem in that the accuracy that current flow transducer is difficult to measure or measure when micro-, low discharge is very low, it is impossible to meet the requirement that range ability is big, certainty of measurement is high。
Summary of the invention
The purpose of the present invention is contemplated to solve the problems referred to above, the internal leakage detecting device of a kind of hydraulic valve is provided, automatically gathering and analyzing of test data can be realized, improve the efficiency that the internal leakage of hydraulic valve is measured, increase the accuracy of range ability and the measurement result automatically measured, and can automatically show test result, can improve for the research and development of evaluation and the hydraulic valve comprehensively of hydraulic valve quality of lot and later stage performance data foundation is provided。
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that the internal leakage detecting device of a kind of hydraulic valve includes testboard bay, support, container, oil inlet pipe, flowline, funnel, LOAD CELLS, transmitter, Single Chip Microcomputer (SCM) system, display module, bi-bit bi-pass solenoid directional control valve and button。
Described LOAD CELLS and transmitter are placed on support, and LOAD CELLS is connected with transmitter；Described container is placed on LOAD CELLS, can being realized weighing to container by LOAD CELLS, container bottom has an oil-out, is connected with flowline, this oil pipe in order to control the keying of this oil circuit, makes the fluid in container be back to test fuel tank through funnel equipped with a bi-bit bi-pass solenoid directional control valve；The one of described oil inlet pipe terminates the leakage hole of tested valve, and the other end is placed in above container, makes the fluid that test solution pressure valve leaks enter container；Described display module is for carrying out the display of result of the test；Described button is for the start and stop of control single chip computer system。Described Single Chip Microcomputer (SCM) system includes single-chip microcomputer, A/D converter, clock module, data memory module, relay and alarm lamp；Wherein said single-chip microcomputer is connected with A/D converter, data memory module, clock module, relay, alarm lamp, display module and button；Wherein said A/D converter is connected with single-chip microcomputer and transmitter, for the signal of telecommunication is changed into digital signal；Wherein said data memory module is used for depositing data；Wherein said clock module is used for obtaining system time；Wherein said relay is connected with bi-bit bi-pass solenoid directional control valve, for controlling the action of bi-bit bi-pass solenoid directional control valve；Wherein said alarm lamp for producing alarm signal after fluid weight exceedes threshold value。
Compared with prior art, present invention have the advantage that
1) automaticity is high, range ability is big
Owing to have employed the data collecting system of LOAD CELLS, transmitter and Single Chip Microcomputer (SCM) system composition, it is achieved that small internal leakage measures the automatic collection with data；
2) measurement result is accurately, reliably
Owing to adopting high-precision counterweight to carry out the demarcation of LOAD CELLS, provide the measurement standard of precision for weighing system；The sensitivity of LOAD CELLS and transmitter is significantly high simultaneously, can detect small weight change；On the other hand, the method for threshold value is set for LOAD CELLS carries out the judgement whether internal leakage overflows owing to have employed so that be excessive and still ensure that the accurately reliable of data when exceeding vessel volume at internal leakage；
3) flexible high
The measurement system that the present invention adopts goes for the internal leakage test of various hydraulic valve, has significantly high flexibility。
Accompanying drawing explanation
Fig. 1 is the product structure schematic diagram of the present invention；
Fig. 2 is the product data collection of the present invention and controls system schematic；
Fig. 3 is the working procedure flow chart of the present invention；
In figure: 1, display module；2, button；3, test-bed；4, Single Chip Microcomputer (SCM) system；5, support；6, transmitter；7, LOAD CELLS；8, funnel；9, flowline；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, alarm lamp。
Detailed description of the invention
The product structure schematic diagram of the internal leakage detecting device of a kind of hydraulic valve of the present invention is as it is shown in figure 1, include testboard bay (3), support (5), container (11), oil inlet pipe (12), flowline (9), funnel (8), LOAD CELLS (7), transmitter (6), Single Chip Microcomputer (SCM) system (4), display module (1), bi-bit bi-pass solenoid directional control valve (10) and button (2)。Described LOAD CELLS (7) and transmitter (6) are placed on support (5), and LOAD CELLS (7) is connected with transmitter (6), and transmitter can adopt XL-A2P type；Described container (11) is placed on support (5), can be realized weighing to container (11) by LOAD CELLS (7) and transmitter (6), and be converted to the signal of telecommunication；One oil-out is arranged at container (11) bottom, it is connected with flowline (9), this oil pipe equipped with a bi-bit bi-pass solenoid directional control valve (10) in order to control the keying of this oil circuit, fluid is made to be back to test fuel tank through funnel (8), the range of container (11) can select for condition query relevant criterion and intended test period according to nominal pressure and the latus rectum with tested valve, then selects the range of corresponding LOAD CELLS (7) according to the range of selected container (11)；The one of described oil inlet pipe (12) terminates the leakage hole of tested valve, and the other end is placed in container (11) top, makes to enter container (11) from oil inlet pipe (12) oil out；Described display module (1) is for carrying out the display of result of the test；Described button (2) is for the start and stop of control single chip computer system (4)。
The Single Chip Microcomputer (SCM) system schematic diagram of the internal leakage detecting device of a kind of hydraulic valve of the present invention is as in figure 2 it is shown, described Single Chip Microcomputer (SCM) system (4) includes single-chip microcomputer (41), A/D converter (42), data memory module (43), clock module (44), relay (45) and alarm lamp (46)。
Wherein said A/D converter (42) is connected with single-chip microcomputer (41) and transmitter (6), for the signal of telecommunication is changed into digital signal；Wherein said data memory module (43) is used for depositing 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 alarm lamp for producing alarm signal after fluid weight exceedes threshold value；Wherein said single-chip microcomputer (41) is connected with A/D converter (42), data memory module (43), clock module (44), relay (45), alarm lamp (46), display module (1) and button (2)。
The operation principle of the present invention is as follows:
Calibration principle: before test, the density needing hydraulic oil first that LOAD CELLS and test is used is demarcated, the step demarcated is: be placed on LOAD CELLS by empty, press the null adjustment button on transmitter, then the standard test weight being equivalent to total weighing is reloaded, press the range on transmitter after loading and regulate button, complete the demarcation of LOAD CELLS；The calibration process of hydraulic oil density is: measure, by measuring cup, the hydraulic oil that volume is V, and bulking value should be not too small, is added by hydraulic oil in container, and then single-chip microcomputer is recorded by LOAD CELLS and adds the gravimetric value of container before and after hydraulic oil, is designated as m respectively0, m1, single-chip microcomputer then passes through formula ρ=(m afterwards1-m0)/V calculates the density value ρ obtaining hydraulic oil, and unit is g/mL。
Test principle: demarcate after terminating, proceed by test, tested hydraulic valve is installed to testing position by user, then flow is made to reach the flow that test is required, pressure is gradually increased to nominal pressure by zero, setting several measurement point therebetween, measure the internal leakage of each set point respectively successively, the internal leakage testing procedure of each set point is as follows:
On-load pressure is to set point pressure, and presses startup button, and single-chip microcomputer passes through cut-off bi-bit bi-pass solenoid directional control valve after receiving this signal, and single-chip microcomputer reads gravimetric value and the time of first data, is designated as m0、t0, then make the fluid of leakage flow in container, single-chip microcomputer continues to read the data of LOAD CELLS and transmitter, the data collected are carried out A/D conversion, and write data memory module, single-chip microcomputer reads gravimetric value and the time of last data before off-test, is designated as m1、t1, single-chip microcomputer calculates the internal leakage of this hydraulic valve afterwards, and formula is q=(m1-m0)/(ρ*(t1-t0)), unit is mL/min, m in formula1-m0For leaking the weight of fluid, t1-t0For duration of test runs, ρ is the density of the hydraulic oil demarcated before；Result of the test is displayed by display module；Carry out the internal leakage test of next set point afterwards, if being the internal leakage test under nominal pressure, then after this test completes, off-test。
Overflow and judge principle: exceeded the volume of container as preventing because the internal leakage of tested hydraulic valve is excessive and produced the situation that fluid overflows, one threshold value m is set in Single Chip Microcomputer (SCM) program according to vessel volume and intended test period2If in test, fluid weight is not reaching to this value, then, after reaching intended test period, press stop button, off-test。If fluid weight reaches this threshold value, then triggering a signal, make alarm lamp report to the police, need to temporarily cease test during this period, the single-chip microcomputer reading time now is t1(owing to also having portion of residual fluid also to stay in oil inlet pipe, therefore should wait until that the fluid in oil inlet pipe flows in container), LOAD CELLS and transmitter still constantly gather weight data, when these data reach stable within a period of time, the fluid illustrated in now oil inlet pipe all flows into container, single-chip microcomputer reads weight now, is designated as m1Then single-chip microcomputer opens solenoid directional control valve by relay, fluid is made to be back to test fuel tank by flowline and funnel, now LOAD CELLS and transmitter still constantly gather weight data, when these data reach stable within a period of time, the fluid illustrated in now container is all back to test fuel tank through funnel；Proceeding internal leakage test afterwards, now single-chip microcomputer is designated as m respectively by gravimetric value and the time of LOAD CELLS and first data of transmitter reading3、t3, after intended test period to be achieved, press stop button, off-test, the gravimetric value of last data read before off-test and time respectively m4、t4。After off-test, single-chip microcomputer carries out the calculating of leakage rate according to the data in data memory module, and computing formula is q=(m1-m0+m4-m3)/(ρ*(t1-t0+t4-t3)), unit is mL/min, m in formula1-m0For valve tested before overflow alarm at t1-t0The weight of tested valve internal leakage fluid, m in time4-m3For the fluid in amount discharge container and proceed test after, at t4-t3The weight of tested valve internal leakage fluid in time, sum is total weight leaking fluid, t1-t0+t4-t3Being total testing time, ρ is the density of the hydraulic oil demarcated before；Result of the test is displayed by display module。
The working procedure flow chart of the present invention is as it is shown on figure 3, the steps include:
1) program initialization
After hydraulic valve is installed to testing position by user, making flow reach the flow that test is required, on-load pressure is to first set point, afterwards open system power supply, single-chip microcomputer carries out a series of initial work, including the initial work of state variable and numerical value in each depositor。
2) on-test
After program initialization, whether the detection user that single-chip microcomputer starts the cycle over has instruction to input, and after detecting that user presses startup button, closes bi-bit bi-pass solenoid directional control valve, starts simultaneously at internal leakage test, enable the fluid of leakage to enter in container。
3) Data acquisition and storage
LOAD CELLS and transmitter will leak out the weight of fluid and convert the signal of telecommunication to, and converts digital signal to through A/D, is input to single-chip microcomputer write data memory module。
4) judgement is overflowed
Exceed the volume of container for preventing because the leakage rate of hydraulic valve is excessive and produce the situation that fluid overflows, according to vessel volume and intended test period, one threshold value is set in Single Chip Microcomputer (SCM) program, if fluid weight is not reaching to this value in test, after then reaching intended test period, press stop button, off-test。If fluid weight reaches this threshold value, then trigger a signal, alarm lamp is made to report to the police, need during this period to temporarily cease test (owing to also having part fluid also to stay in oil inlet pipe, therefore should wait until that the fluid in oil pipe flows in container), LOAD CELLS and transmitter still constantly gather weight data, when these data reach stable within a period of time, the fluid illustrated in now oil inlet pipe all flows into container, then single-chip microcomputer opens solenoid directional control valve by relay, fluid is made to be back to test fuel tank by flowline and funnel, LOAD CELLS and transmitter still constantly gather weight data, when these data reach stable within a period of time, illustrate that now fluid is back to test fuel tank all through flowline and funnel, proceed test afterwards, after intended test period to be achieved, press stop button, off-test。
5) result of the test shows
Single-chip microcomputer carries out the calculating of leakage rate according to the data in data memory module, and result of the test is shown by display module。
6) test proceeds
On-load pressure, to next set point, repeats above step, until completing the internal leakage test of all set points。
Claims (4)
1. the internal leakage detecting device of a hydraulic valve, it is characterized in that including testboard bay (3), support (5), container (11), oil inlet pipe (12), flowline (9), funnel (8), LOAD CELLS (7), transmitter (6), Single Chip Microcomputer (SCM) system (4), display module (1), bi-bit bi-pass solenoid directional control valve (10) and button (2), LOAD CELLS (7) and transmitter (6) are placed on support (5), and LOAD CELLS (7) is connected with transmitter (6)；Button (2) is for the start and stop of control single chip computer system (4)；Single Chip Microcomputer (SCM) system (4) includes single-chip microcomputer (41), A/D converter (42), data memory module (43), clock module (44), relay (45), alarm lamp (46)；The Single Chip Microcomputer (SCM) system (4) that single-chip microcomputer (41), A/D converter (42), data memory module (43), clock module (44), relay (45), alarm lamp (46) form is connected with display module (1) and button (2)；A/D converter (42) is connected with single-chip microcomputer (41) and transmitter (6)；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)；Alarm lamp (46) for producing alarm signal when leakage rate reaches threshold value。
2. the internal leakage detecting device of a kind of hydraulic valve according to claim 1, it is characterized in that described LOAD CELLS (7), transmitter (6), support (5) and container (11) composition weighing system, container (11) is placed on the weight that can measure container (11) on LOAD CELLS (7), and transmitter (6) can be passed through be converted to the signal of telecommunication, digital signal is converted to then through A/D, it is input to single-chip microcomputer, internal leakage is calculated by computing formula again by single-chip microcomputer, and by display module (1) display。
3. the internal leakage detecting device of a kind of hydraulic valve according to claim 1, it is characterized in that an oil-out arranged below of described container (11), it is connected with flowline (9), container (11) opens and closes in order to control it equipped with a bi-bit bi-pass solenoid directional control valve (10)。
4. the internal leakage detecting device of a kind of hydraulic valve according to claim 1, it is characterized in that the one of described oil inlet pipe (12) terminates the leakage hole of tested valve, the other end is placed in above container, equipped with a bi-bit bi-pass solenoid directional control valve (10) on it。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110403891.1A CN103133458B (en) | 2011-12-02 | 2011-12-02 | A kind of internal leakage detecting device of hydraulic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110403891.1A CN103133458B (en) | 2011-12-02 | 2011-12-02 | A kind of internal leakage detecting device of hydraulic valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103133458A CN103133458A (en) | 2013-06-05 |
| CN103133458B true CN103133458B (en) | 2016-06-22 |
Family
ID=48493738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110403891.1A Expired - Fee Related CN103133458B (en) | 2011-12-02 | 2011-12-02 | A kind of internal leakage detecting device of hydraulic valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103133458B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849001B (en) * | 2015-06-09 | 2018-03-30 | 国网山东济南市历城区供电公司 | Leakage in Transformer oil monitoring alarm |
| CN109026845B (en) * | 2017-06-12 | 2020-06-16 | 上海梅山钢铁股份有限公司 | Oil leakage detection and protection device for fan stationary blade adjusting hydraulic 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 |
| CN109441911B (en) * | 2018-12-27 | 2024-03-26 | 燕山大学 | Hydraulic oil leakage simulation test bed for aircraft pipeline |
| CN113669329B (en) * | 2021-10-22 | 2022-01-18 | 济宁安泰矿山设备制造有限公司 | Hydraulic valve endurance test platform |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101737377A (en) * | 2009-12-17 | 2010-06-16 | 张春清 | Online fault detector of hydraulic system |
| CN201607312U (en) * | 2010-02-02 | 2010-10-13 | 浙江大学 | Device for detecting leakage performance of motor valve of gas meter |
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101809425B (en) * | 2007-10-18 | 2012-04-11 | 阿特拉斯·科普柯凿岩设备有限公司 | Method and arrangement for detecting leakage of hydraulic oil |
| EP2270342B1 (en) * | 2009-06-22 | 2013-05-01 | Siemens Aktiengesellschaft | Leakage detection system in a wind turbine |
-
2011
- 2011-12-02 CN CN201110403891.1A patent/CN103133458B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101737377A (en) * | 2009-12-17 | 2010-06-16 | 张春清 | Online fault detector of hydraulic system |
| CN201607312U (en) * | 2010-02-02 | 2010-10-13 | 浙江大学 | Device for detecting leakage performance of motor valve of gas meter |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103133458A (en) | 2013-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103133458B (en) | A kind of internal leakage detecting device of hydraulic valve | |
| CN103760623B (en) | Full-automatic water surface evaporation capacity monitoring system | |
| CN105352990B (en) | A kind of method of testing of Organic phase change thermal storage material cubic deformation | |
| CN202483989U (en) | Internal leakage rate detection device for hydraulic valve | |
| CN203981240U (en) | A kind of IC engine fuel oil consumption monitoring system | |
| CN105425321A (en) | Full-automatic tipping-bucket rain gauge titrator | |
| CN205246139U (en) | Gas content tester | |
| CN204086149U (en) | Water soluble acid tester | |
| CN106872154B (en) | A kind of Low lift safety valve discharge capacity test macro and test method | |
| CN112283593A (en) | Internet of things system for closing valve and detecting leakage of pipe network and leakage detection method thereof | |
| CN102012255A (en) | Automatic control system for oil well tipping bucket measurement | |
| CN111811848A (en) | Comprehensive test system and method for heater | |
| CN202431263U (en) | Automatically continuous metering device for pumping well | |
| CN104763408A (en) | High-precision oil three-phase automatic metering device and metering method thereof | |
| CN201707096U (en) | Container tank calibration device | |
| CN109374064A (en) | A kind of metal hose discharge characteristic test equipment and method | |
| CN205982250U (en) | Reverse osmosis automatic testing arrangement of SDI of intaking | |
| CN201359589Y (en) | Filtering factor detecting device of polymer solution | |
| CN112577525B (en) | Nuclear power station level box availability detection method, device and system | |
| CN108843315B (en) | Sensing type comprehensive automatic metering device and oil quality calculation method | |
| CN208224003U (en) | A kind of biochemical methane potentiality self-operated measuring unit | |
| CN216209991U (en) | Device for automatically detecting standard water storage container | |
| CN219496362U (en) | Mobile detection equipment for SDI value | |
| CN2731450Y (en) | Auto tester for filtering factor | |
| CN205103131U (en) | A infiltration parameter automatic measuring device for material permeability test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160622 Termination date: 20161202 |