CN107743733B - A kind of hydraulic pump flow test device - Google Patents
A kind of hydraulic pump flow test device Download PDFInfo
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- CN107743733B CN107743733B CN201218004112.6A CN201218004112A CN107743733B CN 107743733 B CN107743733 B CN 107743733B CN 201218004112 A CN201218004112 A CN 201218004112A CN 107743733 B CN107743733 B CN 107743733B
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Abstract
The utility model discloses a kind of hydraulic pump flow test device, device includes tested hydraulic pump, motor, testboard, hydraulic system and circuit system, wherein hydraulic system is pressed oil oil circuit, hydraulic pump draining oil circuit, oil return circuit and formed by hydraulic power source, hydraulic pump oil suction line, hydraulic pump, and circuit system includes flow sensor, PLC, Measurement ＆control computer.It is characterized in that three-position four-way electromagnetic directional valve is installed on hydraulic system oil return circuit, realizes the switch test of hydraulic pump outlet flow and housing recirculating oil quantity；Voltage output type flow sensor is replaced using pulse output type flow sensor, realizes the test of instantaneous delivery value, some period oil mass；The data on flows of A/D capture cards collection flow sensor is replaced using the PLC with high-speed counter function；The device is easy to use, test event is complete, cost-effective, has application and promotion prospect well.
Description
Technical field
The present invention relates to hydraulic pump flow technical field of measurement and test, specifically a kind of hydraulic pump flow test device.
Background technology
Hydraulic system has power-mass ratio big, control and regulation simplicity, stable movement, easily realize can lubricating by oneself between overload protection, element
Wear the advantages of small etc., therefore suffer from being widely applied in military fields such as aviation, naval vessel, weapons.Hydraulic system mainly by dynamical element,
The part such as executive component, control element, auxiliary element and hydraulic oil composition.Hydraulic pump is hydraulic system as the dynamical element in hydraulic system
One of most important element.The quality of pump performance directly influences the precision, stability and reliability of hydraulic system output pressure flow.
Hydraulic pump test is primarily referred to as in the test dispatched from the factory and carried out during use to the service behaviour of hydraulic pump, including prexxure of the hydraulic pump, flow, is turned
The numerical value of the parameters such as speed, torque and its measure of changing rule.Hydraulic pump flow is a very important test event in pump performance test,
Mainly measure hydraulic pump dispatches from the factory and whether meets specification requirement by one section of use, its flow.Either hydraulic pump static properties is tested, or liquid
Press pump dynamic performance testing, it is required for carrying out the test of hydraulic pump flow.
Current hydraulic pump flow test device, mainly including parts such as flow sensor, A/D capture cards, PLC, Measurement ＆control computers.Liquid
The press oil port and drain tap of press pump are connected by pipeline with return line respectively, respectively one flow sensor of installation, or only on two return lines
Flow sensor is installed on some return line；The flow sensor used at present is mostly voltage output type, and the flow of hydraulic pump is by flow sensing
Device is converted into voltage signal and passes to A/D capture cards, and the signal of collection is conveyed to Measurement ＆control computer by A/D capture cards, is carried out by Measurement ＆control computer
Data processing and result show and stored；PLC is mainly used in controlling start and stop of hydraulic pump motor etc..Current this test device, when using one
When individual flow sensor, according to the difference of test event, it is necessary to which press oil port or drain tap are connected by flexible pipe with flow sensor, falling
The leakage of hydraulic oil can inevitably occur during changing pipeline；When using two flow sensors, eliminate in test process and switch
The tedious steps of pipeline, but can cause increasing considerably for test device cost using two flow sensors；Also it is exactly regardless of whether test hydraulic pressure
Flow value, flow sensor are connected in fluid pressure line all the time so that flow sensor is hit is easily damaged for a long time.In addition, voltage output type
Flow sensor can only gather instantaneous delivery value, can not test the flow value of some period.PLC also be present in current hydraulic pump flow test device
Use the shortcomings that function is single, A/D capture cards are expensive etc..In a word, current hydraulic pump flow test device be primarily present it is inconvenient for use,
Easily there is leakage, flow value tests the problem of single, expensive etc..
The content of the invention
The purpose of the present invention is to overcome the shortcomings of above-mentioned prior art, there is provided a kind of hydraulic pump flow test device, mainly solves existing hydraulic pump stream
It is inconvenient for use existing for amount test device, easily occur leakage when switching pipeline, instantaneous delivery value, flow sensor can only be tested be hit for a long time easily
The problems such as damaging, be expensive, cost performance is not high.
To achieve these goals, the present invention adopts the following technical scheme that：A kind of hydraulic pump flow test device, it include tested hydraulic pump, motor,
Testboard, hydraulic system and circuit system.Wherein, motor is used to drive tested hydraulic pump works, and testboard is mainly used in installing and fixing test solution
Press pump and motor, hydraulic system are pressed oil oil circuit, hydraulic pump draining oil circuit, oil return circuit and formed by hydraulic power source, hydraulic pump oil suction line, hydraulic pump,
Circuit system includes flow sensor, PLC, Measurement ＆control computer.It is characterized in that the installation 3-position 4-way electromagnetism on hydraulic system oil return circuit
Reversal valve, realize the switch test of hydraulic pump outlet flow and housing recirculating oil quantity；Voltage output type flow is replaced using pulse output type flow sensor
Sensor, realize the test of instantaneous delivery value, some period oil leak amount；Adopted using the PLC with high-speed counter function instead of A/D capture cards
Collect the data on flows of flow sensor, PLC is connected with Measurement ＆control computer, preset TT＆C software in Measurement ＆control computer, enters line number by Measurement ＆control computer
Show and store according to processing and result.
Oil circuit fuel-displaced with hydraulic pump, hydraulic pump draining oil circuit, oil return circuit are connected above-mentioned three-position four-way electromagnetic directional valve respectively, solenoid directional control valve
Spool position be controlled by Measurement ＆control computer by PLC., can be respectively to hydraulic pressure when the valve element of solenoid directional control valve is located at " left position " or " right position "
Pump case recirculating oil quantity and hydraulic pump outlet flow are tested；When the valve element of solenoid directional control valve is located at " middle position ", any flow, hydraulic pump are not measured
Hydraulic oil in fuel-displaced oil circuit and hydraulic pump draining oil circuit is not passed through flow sensor, directly flows back to fuel tank by oil return circuit, can flow sensor
Protected.
Above-mentioned pulse output type flow sensor is converted to flow value the frequency pulse signal directly proportional to flow, is easy to digitize, not only can be with
The test of instantaneous delivery value is realized, and can easily realize the test to some period oil leak amount.
Above-mentioned PLC carries the function of high-speed counter, can be connected with pulse output type flow sensor, realize the tally function to flow value.
PLC is connected by communication cable with Measurement ＆control computer, can be communicated by preset TT＆C software in Measurement ＆control computer with PLC, reading flow
Value, and data processing is carried out by Measurement ＆control computer, calculate, show and store instantaneous delivery value and some period oil leak amount.
A kind of hydraulic pump flow test device of the present invention, for needing the test event of timing to use TT＆C software self-clocking.
A kind of hydraulic pump flow test device of the present invention, the hydraulic power source of the hydraulic system described in it include hydraulic oil container；Hydraulic pump oil suction line
Including oil suction oily filter；Hydraulic pump force feed oil circuit includes press oil port pressure gauge, presses oil the self-styled snap joint of oil circuit, presses oil oil circuit overflow valve；Hydraulic pump is let out
Oil circuit includes the self-styled snap joint of draining oil circuit；Oil return circuit includes three-position four-way electromagnetic directional valve, flow sensor, check valve, oil return oily filter.
The method of hydraulic pump flow test device measurement flow of the present invention, comprises the following steps：
PLC high-speed counters are reset by communication cable by the TT＆C software in Measurement ＆control computer when a. testing；
B. for the TT＆C software in Measurement ＆control computer according to current test event, control PLC is powered on and off to corresponding magnetic valve, makes solenoid directional control valve
Valve element be located at corresponding position；
C. according to currently selected test event, the TT＆C software in Measurement ＆control computer reads the numerical value in PLC high-speed counters according to certain rule,
Flow rate test timing is by TT＆C software self-clocking；
D. when instantaneous delivery value is tested, the TT＆C software in Measurement ＆control computer takes the difference of two flow values of adjacent time inter, and carries out
Differential calculation；When some period oil leak amount is tested, the TT＆C software fetching in Measurement ＆control computer is fixed time two flow values at interval, and
Calculate its difference.Finally result is shown and stored.
Compared with the prior art a kind of hydraulic pump flow test device of the present invention, has following good effect：1. changed using 3-position 4-way electromagnetism
To valve, not only the usage quantity of flow sensor can be reduced to one, reduce the cost of test device, and flow rate test oil circuit can be realized
Be switched fast, eliminate and switch the cumbersome work such as pipeline, avoid the leakage of hydraulic oil, can also be placed in reversal valve when not measuring flow
" middle position ", avoid flow sensor from being in for a long time in oil circuit and be hit；2. passed using pulse output type flow sensor instead of voltage output type flow
Sensor, instantaneous delivery value can be not only tested, and some period oil leak amount can be tested so that the test event of hydraulic pump flow test device
It is more more complete, measuring accuracy is higher；3. the data on flows of A/D capture cards collection flow sensor is replaced using the PLC with high-speed counter function,
The problem of can not only overcoming PLC to use function single in test device, PLC function is given full play to, and A/D capture cards can be removed from
Or the acquisition expenses of Count Board, reduce the cost of test device；4. using TT＆C software self-clocking, flow rate test timing is by CVI softwares
Nonsynchronous timer is completed, and solves in traditional test or human error easily occurs using artificial start and stop manual time-keeping, or using in CVI softwares
Easily there is the problem of timing error is big in timer control timing.
Brief description of the drawings
Fig. 1 is the test philosophy block diagram of the present invention；
Fig. 2 is the hydraulic system principle figure of the present invention；
Fig. 3 is hydraulic pump outlet flow rate test flow chart；
Fig. 4 is casing of hydraulic pump recirculating oil quantity test flow chart；
Fig. 5 is hydraulic pump full flow pressure test flow chart；
Fig. 6 is hydraulic pump deadhead pressure test flow chart.
Embodiment
For a better understanding and implementation, the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1, referring to Fig. 1,2, using YZB-6 types pluger type hydraulic pump as tested pump, by taking the test for being related to flow as an example, by tested hydraulic pressure
Pump 3 and motor 4 are arranged on testboard, then connect hydraulic system and circuit system.
Tested hydraulic pump 3 is driven by motor 4, and motor 4 is buncher, and rotating speed can be adjusted as needed.
Hydraulic system is pressed oil oil circuit, hydraulic pump draining oil circuit, oil return circuit and formed by hydraulic power source, hydraulic pump oil suction line, hydraulic pump.Hydraulic power source bag
Include hydraulic oil container 1；Hydraulic pump oil suction line includes oil suction oily filter 2；Hydraulic pump force feed oil circuit includes press oil port pressure gauge 5, and force feed oil circuit is self-styled quick
Joint 7, force feed oil circuit overflow valve 8；Hydraulic pump draining oil circuit includes the self-styled snap joint 6 of draining oil circuit；Oil return circuit changes including 3-position 4-way electromagnetism
To valve 9, flow sensor 10, check valve 11, oil return oily filter 12.Hydraulic oil container 1, oil suction oily filter 2, it is tested the inlet port of hydraulic pump 3 successively
Connection；The press oil port of tested hydraulic pump 3 is connected by pipeline with press oil port pressure gauge 5, the force feed self-styled snap joint 7 of oil circuit respectively, presses oil oil circuit
C mouth of the other end of self-styled snap joint 7 successively with overflow valve 8, three-position four-way electromagnetic directional valve 9 is connected；The drain tap of tested hydraulic pump 3,
The self-styled snap joint 6 of draining oil circuit, the D mouths of three-position four-way electromagnetic directional valve 9 are sequentially connected；The A mouths of three-position four-way electromagnetic directional valve 9 are by returning
Oily filter 12 is connected with hydraulic oil container 1, and the B mouths of three-position four-way electromagnetic directional valve 9 pass sequentially through flow sensor 10, check valve 11, oil return oil
Filter 12 is connected with hydraulic oil container 1.Three-position four-way electromagnetic directional valve 9 is K-type middle position, during magnetic valve no power, when reversal valve is located at " middle position ",
The coming oil of force feed oil circuit and draining oil circuit directly flows back to hydraulic oil container 1 by oil return oily filter 12, and is not passed through flow sensor 10 and check valve 11；
When solenoid valves make reversal valve be located at " left position ", the coming oil of draining oil circuit flows back to hydraulic pressure by three-position four-way electromagnetic directional valve 9, oil return oily filter 12
Fuel tank 1, the coming oil for pressing oil oil circuit flow back to hydraulic pressure by three-position four-way electromagnetic directional valve 9, flow sensor 10, check valve 11, oil return oily filter 12
Fuel tank 1, the rate of discharge of hydraulic pump 3 is tested；When solenoid valves make reversal valve be located at " right position ", the coming oil of draining oil circuit passes through three
Position four-way electromagnetic reversing valve 9, flow sensor 10, check valve 11, oil return oily filter 12 flow back to hydraulic oil container 1, the housing oil return to hydraulic pump 3
Amount is tested, and the coming oil for pressing oil oil circuit directly flows back to hydraulic oil container 1 by three-position four-way electromagnetic directional valve 9, oil return oily filter 12.
Circuit system is to install PLC13 in the control circuit of three-position four-way electromagnetic directional valve 9；By the output signal end of flow sensor 10 with
PLC13 high-speed counter terminals connection, and the output signal end of pressure gauge 5 and PLC13 analog input terminals are connected；PLC13
Be connected by communication cable with Measurement ＆control computer 14, preset TT＆C software in Measurement ＆control computer 14, by Measurement ＆control computer 14 carry out data processing and
As a result show and store；Observing and controlling project for needing timing, preset TT＆C software self-clocking in calculation machine 14.
Connection forms the hydraulic pump flow test device of the present invention above.
The hydraulic pump flow test device of the present invention, it is as follows that it is related to the method for testing of flow rate test project：It is soft by the observing and controlling of Measurement ＆control computer before test
Part is communicated with PLC, initializes PLC high-speed counter；During test, PLC gathers the pulse signal that flow sensor is sent in real time, and
Communicated by the TT＆C software of Measurement ＆control computer according to currently selected test event with the control law determined with PLC, record PLC high-speed countings
The numerical value of device；TT＆C software is designed and developed using NI companies of the U.S. LabWindows/CVI virtual instrument softwares based on C language, test software
Using the nonsynchronous timer in CVI softwares, complete the timing in test process and determine the acquisition interval Δ t of data work；Then according to test
Data carry out data processing and calculating by Measurement ＆control computer, so as to automatically determine hydraulic pump outlet flow, casing of hydraulic pump recirculating oil quantity, and can be by flow
Data are merged with corresponding hydraulic pump outlet pressure data, determine deadhead pressure, or are drawn full flow pressure curve and then determined the complete of hydraulic pump
Flow pressure, finally result is shown and stored.
Hydraulic pump outlet flow rate test flow is as shown in Figure 3.
Specifically include following steps：
(1) " test " button on virtual test panel is clicked on, starts to test；
(2) TT＆C software test event selected by controls three-position four-way electromagnetic directional valve to move to " left position " by " middle position " by PLC；
(3) rotating speed of buncher is adjusted so that the stabilization of speed of tested hydraulic pump is in rated speed 3940r/min；
(4) TT＆C software is communicated according to preset program with PLC, initializes PLC high-speed counter, is hereafter often adopted by a data
Collect period Δ t, TT＆C software communicates with PLC and once obtains present flow rate accumulated pulse value Nt, then in conjunction with the flow accumulation pulse value of previous moment
Nt-1, the capacity Δ Q that represents of collection period Δ t and individual pulse calculate present flow rate value q, calculation formula is q=(Nt-Nt-i) * Δ Q/ Δ t, filtered through numeral
Real-time display present flow rate value after ripple, the collection period Δ t of this method of testing take 0.2S, the capacity for using flow sensor individual pulse to represent
Δ Q=1ml；
(5) give tested hydraulic pump Slow loading by overflow valve, until by hydraulic pump outlet pressure stability in 14.2Mpa；
(6) after stablizing 10 seconds, judge whether hydraulic pump outlet flow value meets the requirement not less than 21L/min, show test result.
Casing of hydraulic pump recirculating oil quantity testing process is as shown in Figure 4.
Specifically include following steps：
(1) " test " button on virtual test panel is clicked on, starts to test；
(2) TT＆C software test event selected by controls three-position four-way electromagnetic directional valve to move to " right position " by " middle position " by PLC；
(3) rotating speed of buncher is adjusted so that the stabilization of speed of tested hydraulic pump is in rated speed 3940r/min；
(4) TT＆C software is communicated according to preset program with PLC, initializes PLC high-speed counter；
(5) give tested hydraulic pump Slow loading by overflow valve, until by hydraulic pump outlet pressure stability in 18 ± 0.2Mpa；
(6) after stablizing 10 seconds, TT＆C software obtains initial flow accumulated pulse value N with PLC communications0, TT＆C software timer starts timing,
Flux cumulating pulse value N of the TT＆C software with PLC communications acquisition this moment after 1 minute60, then according to Q=(N60-N0) * Δs Q calculate housing 1 divide
The recirculating oil quantity of clock；
(7) judge whether the casing of hydraulic pump recirculating oil quantity of 1 minute meets the requirement no more than 5L, show test result.
Hydraulic pump full flow pressure testing process is as shown in Figure 5.
Specifically include following steps：
(1) " test " button on virtual test panel is clicked on, starts to test；
(2) TT＆C software test event selected by controls three-position four-way electromagnetic directional valve to move to " left position " by " middle position " by PLC；
(3) rotating speed of buncher is adjusted so that the stabilization of speed of tested hydraulic pump is in rated speed 3940r/min；
(4) TT＆C software is communicated according to preset program with PLC, initializes PLC high-speed counter；
(5) tested hydraulic pump Slow loading is given by overflow valve, hydraulic pump outlet pressure is gradually increased to 19Mpa from minimum value, when hydraulic pressure pumps out
When mouth pressure is between 0~14Mpa, the amplitude that hydraulic pump outlet pressure adjusts every time is 2Mpa；When hydraulic pump outlet pressure 14~18Mpa it
Between when, the amplitude that hydraulic pump outlet pressure adjusts every time is 0.2Mpa；When hydraulic pump outlet pressure is between 18~19Mpa, hydraulic pump outlet pressure
The amplitude that power adjusts every time is 0.5Mpa；
(6) after often adjusting a hydraulic pump outlet pressure, need to stablize 5 seconds, hereafter TT＆C software and PLC communications carries out the number of pressure and flow
According to collection, a length of 2 seconds during total collection, data collection interval Δ t is 0.2 second, then according to being carried in outlet of plunger pump flow rate test flow
And method of calculating flux calculate the flow value at each moment, then flow value and collection gained to calculating gained pressure value carry out digital filtering processing after
Average, in this, as the pressure and flow value of this adjustment；
(7) treat that hydraulic pump outlet pressure is progressively adjusted to 19Mpa, after the completion of all data acquisitions, TT＆C software can according to preset program, with
Hydraulic pump outlet pressure is abscissa, and using hydraulic pump outlet flow as ordinate, full flow is drawn out according to each group pressure and the flow value fitting measured
Pressure curve, and thereby determine that full flow pressure；
(8) judge whether hydraulic pump full flow pressure meets the requirement not less than 14.86Mpa, show test result.
In order to improve the drafting precision of full flow pressure curve and the measuring accuracy of full flow pressure, hydraulic pump outlet pressure needs progressively to adjust, and
In different pressure ranges, the amplitude of pressure adjustment is different, and this certainly will cause the problems such as testing procedure is cumbersome, test period is long；In order to carry
PLC and proportional pressure control valve with analog output module can be used in the automaticity of height test, test device, can be by TT＆C software in test process
According to preset program, the loading of Analog control proportional pressure control valve is exported by PLC, so as to realize the automatic loading of hydraulic pump outlet pressure, pressure
The automatic test of power and flow.
Hydraulic pump deadhead pressure testing process is as shown in Figure 6.
Specifically include following steps：
(1) " test " button on virtual test panel is clicked on, starts to test；
(2) TT＆C software test event selected by controls three-position four-way electromagnetic directional valve to move to " left position " by " middle position " by PLC；
(3) rotating speed of buncher is adjusted so that the stabilization of speed of tested hydraulic pump is in rated speed 3940r/min
(4) TT＆C software is communicated according to preset program with PLC, initializes PLC high-speed counter, is surveyed according to outlet of plunger pump flow
The method referred in examination flow is acquired to data on flows, calculates and shown；
(5) tested hydraulic pump Slow loading is given by overflow valve, hydraulic pump outlet pressure is gradually risen from minimum value, pay attention to observing in adjustment
Hydraulic pump outlet flow；
(6) as the raising of hydraulic pump outlet pressure, flow are gradually reduced, corresponding hydraulic pump outlet pressure when record flow is approximately zero should
Pressure is deadhead pressure；
(7) judge the requirement whether hydraulic pump deadhead pressure meets 18 ± 0.2Mpa, show test result.
The method of testing of the hydraulic pump flow test device of the present invention is applicable not only to the flow rate test of YZB-6 type pluger type hydraulic pumps, is equally applicable to other
The flow rate test of the hydraulic pump of type and model, such as plunger pump, gear pump and vane pump；When PLC carries Analog input mModule, the present invention
Hydraulic pump flow test device the pressure data of oil circuit pressure table can be also pressed oil to hydraulic pump be acquired, to realize to the full flow pressure of hydraulic pump
Etc. the test of other performance；When PLC is with analog output module, overflow valve adoption rate overflow valve, hydraulic pump flow of the invention test dress
Put and hydraulic pump outlet pressure can be also automatically adjusted according to the preset program of TT＆C software, and can be to data such as hydraulic pump outlet pressure, flows certainly
Dynamic collection, automatic drafting full flow pressure curve, automatically determine full flow pressure；When the oil suction line of the hydraulic pump flow test device in the present invention
With pressure gauge is installed on draining oil circuit and when carrying out data acquisition, hydraulic pump oil suction pressure, drainage pressure can also be realized respectively to hydraulic pump outlet stream
Measure the test influenceed.
Claims (3)
1. a kind of hydraulic pump flow test device, it includes tested hydraulic pump (3), motor (4), testboard, hydraulic system and circuit system, institute
State hydraulic system to be pressed oil oil circuit, hydraulic pump draining oil circuit, oil return circuit by hydraulic power source, hydraulic pump oil suction line, hydraulic pump and formed, the hydraulic power source
Including hydraulic oil container (1)；The circuit system includes pulse output type flow sensor (10), PLC (13), Measurement ＆control computer (14)；It is special
Sign is the installation solenoid directional control valve (9) on hydraulic system oil return circuit, realizes the switch test of hydraulic pump outlet flow and housing recirculating oil quantity；It is described
Solenoid directional control valve (9) be three-position four-way electromagnetic directional valve, be connected respectively with hydraulic pump force feed oil circuit, hydraulic pump draining oil circuit, oil return circuit,
The spool position of solenoid directional control valve (9) is controlled by Measurement ＆control computer (14) by PLC (13)；In the oil return circuit all the way of hydraulic system
Upper installation pulse output type flow sensor (10), when the valve element of solenoid directional control valve (9) is located at " left position " or " right position ", respectively to hydraulic pressure
Pump case recirculating oil quantity or hydraulic pump outlet flow are tested, and when the valve element of solenoid directional control valve is located at " middle position ", do not measure any flow, hydraulic pressure
The hydraulic oil being pumped in oil circuit and hydraulic pump draining oil circuit is not passed through pulse output type flow sensor (10), directly passes through another way oil return circuit
Fuel tank is flowed back to, pulse output type flow sensor (10) can be protected；PLC (13) carries high-speed counter function in circuit system.
2. hydraulic pump flow test device as claimed in claim 1, it is characterised in that solenoid directional control valve (9) is 3-position 4-way K-type middle position electromagnetism
Reversal valve.
3. hydraulic pump flow test device as claimed in claim 1, it is characterised in that PLC (13) carries analog input and analog output work(
Energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201218004112.6A CN107743733B (en) | 2012-09-24 | 2012-09-24 | A kind of hydraulic pump flow test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201218004112.6A CN107743733B (en) | 2012-09-24 | 2012-09-24 | A kind of hydraulic pump flow test device |
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| Publication Number | Publication Date |
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| CN107743733B true CN107743733B (en) | 2014-10-22 |
Family
ID=61224610
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| Application Number | Title | Priority Date | Filing Date |
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| CN201218004112.6A Active CN107743733B (en) | 2012-09-24 | 2012-09-24 | A kind of hydraulic pump flow test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303243A (en) * | 2018-01-31 | 2018-07-20 | 嘉兴林众电子科技有限公司 | Micro pump flow testing system |
| CN110056502A (en) * | 2019-05-28 | 2019-07-26 | 启东高压油泵有限公司 | A kind of axial plunger pump with draining measurement |
-
2012
- 2012-09-24 CN CN201218004112.6A patent/CN107743733B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303243A (en) * | 2018-01-31 | 2018-07-20 | 嘉兴林众电子科技有限公司 | Micro pump flow testing system |
| CN110056502A (en) * | 2019-05-28 | 2019-07-26 | 启东高压油泵有限公司 | A kind of axial plunger pump with draining measurement |
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