CN108916018A - A kind of gear pump multi-parameters test device and test method - Google Patents
A kind of gear pump multi-parameters test device and test method Download PDFInfo
- Publication number
- CN108916018A CN108916018A CN201810600439.6A CN201810600439A CN108916018A CN 108916018 A CN108916018 A CN 108916018A CN 201810600439 A CN201810600439 A CN 201810600439A CN 108916018 A CN108916018 A CN 108916018A
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- Prior art keywords
- oil tank
- operating oil
- gear pump
- switch
- tank switch
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention discloses a kind of gear pump multi-parameters test devices, including stage body (17), operating oil tank (16), direct current generator (4), DC power supply (1), main fuel tank (15), tested gear pump (7) are set in the operating oil tank (16), and ammeter (3) are equipped in the circuit of the direct current generator (4) and the DC power supply (1), main fuel tank switch (14) is equipped between the input terminal and the main fuel tank (15) of the operating oil tank (16), the operating oil tank (16) is successively arranged the first operating oil tank switch (8) between output end and input terminal, flowmeter (9) and coarse filter (11), the output end of the gear pump (7) is equipped with pressure gauge (6), the first operating oil tank switch (8) is the switch of openings of sizes continuously adjustable.The invention also discloses a kind of gear pump multi-parameters test methods.Gear pump multi-parameters test device of the invention, realizes the measurement of the current value and flow value under different pressures value.
Description
Technical field
The invention belongs to hydraulic observation and control technology fields, more particularly, to a kind of gear pump multi-parameters test device and survey
Method for testing.
Background technique
Hydraulic sterring engine is the important execution unit of servo mechanism, and gear pump is one of core component of hydraulic sterring engine, gear
Pump is that swept volume changes and movement is to convey liquid or be allowed to the revolution being pressurized by being formed by between pumping cylinder and meshing gear
Pump.Two enclosure spaces are formed by two gears, the pump housing and front and rear covers, when gear rotation, the body in the space for the side that is out of gear
Product becomes larger from small, forms vacuum, draws liquid into, and the volume in the space of gear engagement side is from becoming smaller greatly, and by liquid extruding pipe
In road, sucking cavity and discharge chamber are that the path of contact of two gears is leaned on to separate.The performance of gear pump determines hydraulic sterring engine
Quality, generally use gear pump test device to realize that gear pump performance is quickly tested.
But the gear pump test device in traditional design can only quantitatively realize the special test of a certain magnitude, if needing
The performance parameters such as operating current, working flow of the gear pump under different pressures environment are tested, then need multiple surveys
Progress is set in trial assembly, and repeatedly test is just able to achieve, and causes mechanism huge, and the manufacturing cycle is long, at high cost, and test period is long, cannot be applicable in
In the requirement of different size series gear pump performance quickly tested
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provide a kind of gear pump multi-parameters test device and
Test method, by setting gradually the first operating oil tank switch traffic meter and thick mistake between the output end and input terminal of gear pump
Filter, forms circulation loop, and the output end of gear pump is equipped with pressure gauge, and the dial of pressure gauge is set to stage body surface, and first
Operating oil tank switch is the switch of opening continuously adjustable, and the electricity under different pressures value is obtained by the first fuel tank switch of adjusting
Flow valuve and flow value, the performance that can be widely applied to the different a variety of gear pumps of operating current under different pressures, working flow are surveyed
Examination, measuring accuracy is high, test scope is wide, clamping process is simple and convenient effectively, and test speed is fast, high reliablity.
To achieve the goals above, as one aspect of the present invention, the present invention provides a kind of gear pump multi-parameters test
Device, including stage body, set on described intracorporal operating oil tank, direct current generator and the direct current powered for the direct current generator
Source further includes the main fuel tank equipped with fuel feeding motor, is tested gear pump and is set in the operating oil tank, and is connected with the direct current generator
It connects, and is equipped with ammeter in the circuit of the direct current generator and the DC power supply；
It is equipped with main fuel tank between the input terminal of the operating oil tank and the main fuel tank to switch, and is joined by fluid pressure line
It is logical, oil liquid is inputted in the operating oil tank；The first work is successively arranged between the operating oil tank output end and input terminal
Fuel tank switch, flowmeter and coarse filter enter the operating oil tank by the filtered oil circulation of the coarse filter
Input terminal；
The pressure gauge for detecting gear pump pressure is equipped between the first operating oil tank switch and the gear pump, and
The dial plate of the first operating oil tank switch, the flowmeter and pressure gauge is set to the surface of the stage body, first work
Make the switch that fuel tank switch is openings of sizes continuously adjustable, obtains different pressures by adjusting the first operating oil tank switch
Current value and flow value under value.
Further, the stage body is equipped with operating oil tank visual window, and the operating oil tank visual window is set to the work
The top of fuel tank.
Further, fine filter is equipped between the main fuel tank switch and the input terminal of the operating oil tank.
Further, shaft coupling, one end of the shaft coupling and institute are equipped between the gear pump and the direct current generator
State the gear axis connection of gear pump, the motor axis connection of the other end and the direct current generator.
Further, the second operating oil tank is equipped between the coarse filter and the input terminal of the operating oil tank to switch.
Further, the first work mailbox switch and second operating oil tank switch are shut-off valve.
As another aspect of the present invention, a kind of gear pump multi-parameters test method is provided, steps are as follows：
Tested gear pump is mounted in the operating oil tank by S1, and make the gear shaft of the gear pump with it is described
Direct current generator connection, output end and first operating oil tank switch connect；
The flowmeter cable is connected on 220V power supply by S2, opens the DC power supply, and pass through the voltmeter tune
Save the voltage of the DC power supply.
S3 opens the main fuel tank switch and the fuel feeding motor, and power supply motor drives main fuel tank gear pump after opening power-up
Oil liquid is sent in the operating oil tank, fuel feeding electricity is closed when oil liquid amount reaches appropriate amount from the operating oil tank visual window
Machine and main fuel tank switch, fuel cut-off；
S4 opens the direct current generator after opening the first operating oil tank switch, the second operating oil tank switch, and test is opened
Begin, by observing the reading of the pressure gauge and adjusting the first operating oil tank switch, pressure is adjusted to required value, phase is read
Answer the value of ammeter and flowmeter under pressure；
The current value and flow value under the first operating oil tank switch acquisition different pressures value are adjusted, to complete different pressures
The test of corresponding operating current and working flow under power.
Further, in step S3, when the liquid level of the oil liquid is 1~2cm at a distance from the operating oil tank visual window
When close the fuel feeding motor and the main fuel tank switch.
Further, in step S2, the voltage of the DC power supply is adjusted in the range of 26~31V.
Further, before installation, by the fuel feeding motor, main fuel tank switch, the first operating oil tank switch and described the
Two operating oil tanks switch is adjusted to closed state.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect：
(1) gear pump multi-parameters test device of the invention, by between the output end and input terminal of gear pump successively
First operating oil tank switch traffic meter and coarse filter are set, form circulation loop, and the output end of gear pump is equipped with pressure gauge,
The dial of pressure gauge is set to stage body surface, and the first operating oil tank switch is the switch of opening continuously adjustable, passes through adjusting
First fuel tank switch obtain different pressures value under current value and flow value, can be widely applied to operating current under different pressures,
The performance test of the different a variety of gear pumps of working flow, measuring accuracy is high, test scope is wide, clamping process is simple and convenient has
Effect, test speed is fast, high reliablity.
(2) gear pump multi-parameters test device of the invention, stage body are equipped with operating oil tank visual window, pass through operating oil tank
Visual window can be observed from the oil mass being input in operating oil tank in main fuel tank, the pass when the oil mass in operating oil tank reaches suitable
Main fuel tank switch is closed, is stopped to operating oil tank fuel feeding；It is equipped with fine filter between main fuel tank switch and the input terminal of operating oil tank,
For being filtered to the oil liquid in input service fuel tank, guarantee the performance of gear pump；The input of coarse filter and operating oil tank
It is equipped with the second operating oil tank between end, realizes the control for flowing into the oil liquid in operating oil tank to circulation.
(3) gear pump multi-parameters test method of the invention passes through main fuel tank to work after gear pump normal mounting first
Make fuel feeding in fuel tank, and be filtered by work fine filter, oil liquid amount is observed by operating oil tank visual window, reaches suitable
Fuel cut-off when amount realizes accurate control, closes main fuel tank later, opens the first operating oil tank and the second operating oil tank, pass through
The pressure for adjusting the first operating oil tank adjusting tooth wheel pump obtains different pressures test value, and by reading flowmeter and ammeter
Reading obtains the flow value and current value under different pressures environment, adapts to the performance test under different pressures are adjusted, and test essence
Degree is high, test scope is wide.
(4) gear pump multi-parameters test method of the invention, the liquid level of oil liquid at a distance from operating oil tank visual window for 1~
The fuel feeding motor and main fuel tank switch are closed when 2cm, position at this time is to meet operating oil tank proper testing most
Suitable oil mass, convenient for the completion of test.
Detailed description of the invention
Fig. 1 is fluid pressure line connection schematic diagram in a kind of gear pump multi-parameters test device of the embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of gear pump multi-parameters test device of the embodiment of the present invention.
In all attached drawings, the same appended drawing reference indicates identical structure and part, wherein：1- DC power supply, 2- voltage
Table, 3- ammeter, 4- direct current generator, 5- shaft coupling, 6- pressure gauge, 7- gear pump, the first operating oil tank of 8- switch, 9- flow
Meter, 10- overflow valve, 11- coarse filter, 12- fine filter, the second operating oil tank of 13- switch, 14- main fuel tank switch, 15- master
Fuel tank, 16- operating oil tank, 17- stage body, 18- work drive motor switch, 19- total power switch, 20- fuel feeding motor switch, 21- work
Make fuel tank visual window.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that
Not constituting conflict between this can be combined with each other.
Fig. 1 is fluid pressure line connection schematic diagram in a kind of gear pump device for quick testing of the embodiment of the present invention.Fig. 2 is this hair
A kind of bright structural schematic diagram of gear pump device for quick testing of embodiment.As depicted in figs. 1 and 2, test device include stage body 17,
Operating oil tank 16, DC power supply 1, direct current generator 4, main fuel tank switch 14, the first operating oil tank switch 8, the second operating oil tank are opened
13, fine filter 12, coarse filter 11, flowmeter 9, voltmeter 2, ammeter 3, pressure gauge 6 and shaft coupling 5 are closed, and is set to
Work drive motor switch 18, total power switch 19, power supply motor switch 20 and the operating oil tank visual window 21 on 17 surface of stage body；Gear
Pump 7 and overflow valve 10 are set in operating oil tank 16, and gear pump 7 is connect with direct current generator 4 by shaft coupling 5, and 5 one end of shaft coupling connects
The gear shaft of gear pump 7 is connect, the other end connects the motor shaft of direct current generator 4, for the motor shaft driven gear of direct current generator 4
Pump 7 rotation works.
DC power supply 1 is used to power for direct current generator 4, and direct current generator 4 is connected in the circuit of DC power supply 1, direct current
Source 1 is equipped with voltmeter 2, and the surface of stage body 17 is arranged in the dial plate of voltmeter 2, and the reading by reading voltmeter 2 controls straight
The output in galvanic electricity source 1；It is additionally provided with ammeter 3 in the circuit of direct current generator 4 and DC power supply 1, the dial plate of ammeter 3 is equally arranged
On the surface of stage body 17, with the output of auxiliary adjustment DC power supply 1.
Operating oil tank 16 and 15 connection of main fuel tank, for by main fuel tank 15 to 16 fuel feeding of operating oil tank, in main fuel tank 15
Equipped with main fuel tank gear pump, and main fuel tank gear pump is connect with fuel feeding motor, and fuel feeding motor drives main fuel tank gear pump, will be led
Oil in fuel tank 15 is pumped out in operating oil tank 16；Preferably, fuel feeding motor is equipped with fuel feeding motor switch 20, and fuel feeding electricity
Machine switch 20 is set to the surface of stage body 17, and the operating of fuel feeding motor is controlled by control fuel feeding motor switch 20.
Main fuel tank switch 14 is equipped between main fuel tank 15 and operating oil tank 16, and the control button of main fuel tank switch 14 is set to
The surface of stage body 17 controls the on-off of the fuel feeding into operating oil tank 16 of main fuel tank 15, by control main fuel tank switch 14 with cooperation
The completion of test.
Fine filter 12 is equipped between main fuel tank switch 14 and operating oil tank 16, after the oil in main fuel tank 15 is filtered
It is input in operating oil tank 16, guarantees the performance of gear pump 7.Further, passing through between main fuel tank 15 and operating oil tank 16
Fluid pressure line connection, realizes fuel feeding and oil-feeding control and filtering.Wherein, the oil after 12 filter of fine filter is input to tooth
In wheel pump 7.
16 periphery of operating oil tank is equipped with the circuit of a circle fluid pressure line, and the output end of gear pump 7 is equipped with the first operating oil tank
Switch 8 can be manually adjusted preferably, the first operating oil tank switch 8 is shut-off valve, control the output quantity of gear pump 7；
Pressure gauge 6, and the first operating oil tank switch 8 and pressure gauge are equipped between first operating oil tank switch 8 and the output end of gear pump 7
The surface of stage body 17 is arranged in 6 dial plate, and the first operating oil tank switch 8 is the switch of openings of sizes continuously adjustable, passes through tune
It saves the first operating oil tank switch 8 while reading the reading of pressure gauge 6 and be adjusted precisely to required pressure value；
The second operating oil tank is equipped between the output end of first operating oil tank switch 8 and the input terminal of operating oil tank 16 to switch
13, by the switch of the second operating oil tank switch 13 of control so that the oil of outflow gear pump 7 back flows back into work after circulation
In fuel tank 16, and the second operating oil tank switch 13 is set to the surface of stage body 17, it can be achieved that manually controlling；Further, the first work
Make to be equipped with coarse filter 11 between fuel tank switch 8 and the second operating oil tank switch 13, coarse filtration is carried out to the oil of outflow gear pump 7
Flow back to it in operating oil tank 16 afterwards；Flowmeter 9 is equipped between first operating oil tank switch 8 and coarse filter 7, for detecting
The flow in the oil circuit of gear pump 7 is flowed out, and the surface of stage body 17 is arranged in the dial plate of flowmeter 9, can intuitively read flow value.
Preferably, stage body 17 is equipped with operating oil tank visual window 21, and operating oil tank visual window 21 is set to operating oil tank
Top, for observing oil liquid amount, with when the oil mass in operating oil tank 16 reaches suitable close main fuel tank switch 14, stopping pair
14 fuel feeding of operating oil tank.
Preferably, the surface of stage body 17 is equipped with work drive motor switch 19, work drive motor switch 19 is for controlling direct current
The switch of machine 4, whether rotation to control gear pump 7.
Preferably, the surface of stage body 17 is additionally provided with total power switch 19 and display lamp, total power switch is total for controlling
The switch of circuit, when total power switch 19 is opened, display lamp flash red.
Preferably, the first operating oil tank switch 8, the second operating oil tank switch 18 and main fuel tank switch are shut-off valve.
A kind of gear pump multi-parameters test method, based on a kind of above-mentioned gear pump multi-parameters test device completion, step is such as
Under：
Tested gear pump 7 is mounted in operating oil tank 16 by S1, and makes the gear shaft and direct current generator of gear pump 7
4 motor shaft is connected by shaft coupling 5, and the output end of gear pump 7 is connect with the first operating oil tank switch 8；
Before installation, by total power switch 19, work drive motor switch 18, fuel feeding motor switch 20, main fuel tank switch 14,
One operating oil tank switch 8 and the second operating oil tank switch 13 are adjusted to closed state；
9 cable of flowmeter is connected on 220V power supply by S2, opens DC power supply 1, and adjust power supply electricity by voltmeter 2
Pressure opens total power switch 19；
Wherein, the surface circuit connection when display lamp flash red；
Preferably, supply voltage adjustment is in the range of 26~31V；
S3 opens main fuel tank switch 14 and fuel feeding motor switch 20, and fuel feeding motor switch 20 drives main fuel tank after opening power-up
Oil liquid is sent in operating oil tank 9 by gear pump, closes fuel feeding when oil liquid amount reaches appropriate amount from operating oil tank visual window 21
Motor switch 20 and main fuel tank switch 14, fuel cut-off, the fuel feeding into operating oil tank 16 of main fuel tank 15 are completed；
Preferably, closing fuel feeding motor when the liquid level of oil liquid is 1~2cm at a distance from operating oil tank visual window 21
Switch 20 and main fuel tank switch 14.
S4 opens work drive motor switch 18 after opening the first operating oil tank switch 8, the second operating oil tank switch 13, and test is opened
Begin, by observing the reading of pressure gauge 6 and adjusting the first operating oil tank switch 8, pressure is adjusted to required value, is read corresponding
The value of ammeter 3 and flowmeter 9 under pressure；
The current value and flow value under the first operating oil tank switch 8 acquisition different pressures value are adjusted, to complete different pressures
Under corresponding operating current and working flow test.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of gear pump multi-parameters test device, including stage body (17), the operating oil tank (16) being set in the stage body (17),
Direct current generator (4) and the DC power supply (1) powered for the direct current generator (4), which is characterized in that further include being equipped with fuel feeding motor
Main fuel tank (15), be tested gear pump (7) and be set in the operating oil tank (16), and connect with the direct current generator (4), and institute
It states in the circuit of direct current generator (4) and the DC power supply (1) and is equipped with ammeter (3)；
Main fuel tank switch (14) is equipped between the input terminal and the main fuel tank (15) of the operating oil tank (16), and by hydraulic
Pipeline connection inputs oil liquid in the operating oil tank (16)；The operating oil tank (16) between output end and input terminal according to
It is secondary to be equipped with the first operating oil tank switch (8), flowmeter (9) and coarse filter (11), after the coarse filter (11) filtering
Oil circulation enter the operating oil tank (16) input terminal；
The pressure for detecting gear pump (7) pressure is equipped between the first operating oil tank switch (8) and the gear pump (7)
Table (6), and the dial plate of first operating oil tank switch (8), the flowmeter (9) and pressure gauge (6) is set to the stage body
(17) surface, the first operating oil tank switch (8) is the switch of openings of sizes continuously adjustable, by adjusting described first
Operating oil tank switchs the current value and flow value under (8) acquisition different pressures value.
2. a kind of gear pump multi-parameters test device according to claim 1, which is characterized in that set on the stage body (17)
Have operating oil tank visual window (21), the operating oil tank visual window (21) is set to the top of the operating oil tank (16).
3. a kind of gear pump multi-parameters test device according to claim 1 or 2, which is characterized in that the main fuel tank is opened
It closes and is equipped with fine filter (12) between (14) and the input terminal of the operating oil tank (16).
4. a kind of gear pump multi-parameters test device according to claim 3, which is characterized in that the gear pump (7) with
Shaft coupling (5) are equipped between the direct current generator (4), one end of the shaft coupling (5) and the gear shaft of the gear pump (7) connect
It connects, the motor axis connection of the other end and the direct current generator (4).
5. a kind of gear pump multi-parameters test device according to claim 1, which is characterized in that the coarse filter (11)
The second operating oil tank switch (13) is equipped between the input terminal of the operating oil tank (16).
6. a kind of gear pump multi-parameters test device according to claim 5, which is characterized in that the first work mailbox
Switching (8) and second operating oil tank switch (13) is shut-off valve.
7. a kind of gear pump multi-parameters test method, should be such as a kind of gear pump multi-parameter according to any one of claims 1 to 6
Test device realizes that steps are as follows：
Tested gear pump (7) is mounted in the operating oil tank (16) by S1, and makes the gear shaft of the gear pump (7)
It is connect with the direct current generator (4), output end switchs (8) with first operating oil tank and connect；
The flowmeter (9) cable is connected on 220V power supply by S2, is opened the DC power supply (1), and passes through the voltmeter
(2) voltage of the DC power supply (1) is adjusted.
S3 opens the main fuel tank switch (14) and the fuel feeding motor, and power supply motor drives main fuel tank gear pump after opening power-up
Oil liquid is sent in the operating oil tank (9), pass when oil liquid amount reaches appropriate amount from the operating oil tank visual window (21)
Close fuel feeding motor and main fuel tank switch (14), fuel cut-off；
S4 opens the first operating oil tank switch (8), the second operating oil tank switch (13) opens the direct current generator (4) afterwards,
Test starts, and by observing the reading of the pressure gauge (6) and adjusting the first operating oil tank switch (8), pressure is adjusted to institute
The value needed reads the value of ammeter (3) and flowmeter (9) under relevant pressure；
The current value and flow value under the first operating oil tank switch (8) acquisition different pressures value are adjusted, to complete different pressures
The test of corresponding operating current and working flow under power.
8. a kind of gear pump multi-parameters test method according to claim 7, which is characterized in that in step S3, when described
The liquid level of oil liquid closes the fuel feeding motor and the master when being 1~2cm at a distance from the operating oil tank visual window (21)
Fuel tank switch (14).
9. a kind of gear pump multi-parameters test method according to claim 7 or 8, which is characterized in that in step S2, by institute
The voltage for stating DC power supply (1) adjusts in the range of 26~31V.
10. a kind of gear pump multi-parameters test method according to claim 9, which is characterized in that, will be described before installation
Fuel feeding motor, main fuel tank switch (14), the first operating oil tank switch (8) and second operating oil tank switch (13) are adjusted to close
Closed state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810600439.6A CN108916018A (en) | 2018-06-12 | 2018-06-12 | A kind of gear pump multi-parameters test device and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810600439.6A CN108916018A (en) | 2018-06-12 | 2018-06-12 | A kind of gear pump multi-parameters test device and test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108916018A true CN108916018A (en) | 2018-11-30 |
Family
ID=64419183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810600439.6A Pending CN108916018A (en) | 2018-06-12 | 2018-06-12 | A kind of gear pump multi-parameters test device and test method |
Country Status (1)
| Country | Link |
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| CN (1) | CN108916018A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700640A (en) * | 2021-09-09 | 2021-11-26 | 昆山阿普顿自动化系统有限公司 | Gas measurement method and device of gear pump |
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| CN206906005U (en) * | 2017-05-04 | 2018-01-19 | 浙江吉利控股集团有限公司 | It is a kind of to be used for fuel pump, the performance test apparatus of fuel filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4798086A (en) * | 1987-03-23 | 1989-01-17 | Caterpillar Inc. | Test bench for testing hydraulic pumps and motors |
| CN201461364U (en) * | 2008-11-26 | 2010-05-12 | 中国船舶重工集团公司第七○七研究所九江分部 | Gear pump intelligent test bed |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700640A (en) * | 2021-09-09 | 2021-11-26 | 昆山阿普顿自动化系统有限公司 | Gas measurement method and device of gear pump |
| CN113700640B (en) * | 2021-09-09 | 2024-01-30 | 昆山阿普顿自动化系统有限公司 | Air testing method and device for gear pump |
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Application publication date: 20181130 |
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| RJ01 | Rejection of invention patent application after publication |