CN110425124A - It is a kind of apply centrifugal force plunger pump movement abrasion and leakage measuring instrumentation testing stand - Google Patents
It is a kind of apply centrifugal force plunger pump movement abrasion and leakage measuring instrumentation testing stand Download PDFInfo
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- CN110425124A CN110425124A CN201910654710.9A CN201910654710A CN110425124A CN 110425124 A CN110425124 A CN 110425124A CN 201910654710 A CN201910654710 A CN 201910654710A CN 110425124 A CN110425124 A CN 110425124A
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- plunger
- cavity
- bushing
- centrifugal force
- rotation section
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- 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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses plunger pump movement abrasion and leakage measuring instrumentation testing stands that one kind can apply centrifugal force: main cavity is fixed on the top surface of stage body；Rotation section is rotatably connected in the cavity of main cavity；Driving portion is arranged inside stage body, and for driving rotation section to rotate；The sealing of plunger cavity is fixed at the top of main cavity；Bushing is set in the cavity of plunger cavity, and one layer of resin is filled between plunger cavity inner wall and bushing side wall, stepped groove is offered below the inner wall of bushing, is arranged with sealing ring in stepped groove；The side wall of bushing and plunger cavity offers the oil pumping hole being connected to stepped groove；Plunger is movably connected in bushing, and plunger base is connect with rotation section, and plunger pumps under the drive of rotation section；Screw passes through plunger cavity wall and is fixedly connected with bushing side wall, and screw is connected with force component.The present invention overcomes traditional testing stands to lack the defect that centrifugal force considers when leakage rate and plunger wear are tested, and simulation effect is good, and test accuracy is high.
Description
Technical field
The present invention relates to plunger motion modelling technique fields, more particularly to a kind of to apply centrifugal force
Plunger pump movement abrasion and leakage measuring instrumentation testing stand.
Background technique
Currently, plunger is mainly used to trandfer fluid in pump or compressor.Cam-type axial piston pump mainly includes master
Axis, cylinder body, plunger, piston shoes, return plate, swash plate etc.；Its working principle is that: under the drive of the motor, main shaft is coupled by spline
Cylinder body rotation is driven, cylinder body drives plunger rotation, and plunger moves back and forth in cylinder holes under the action of swash plate and return plate, plunger
Head is equipped with piston shoes, due to the effect of return plate, piston shoes bottom is forced to be bonded always with swash plate holding.In order to make the past of plunger
Multiple movement accurately switches with oil suction, pressure oil realization, places between the flow end face of cylinder body and the inlet port and press oil port of pump
Fixed valve plate, valve plate are close to that cylinder body is opposite to be slided.When cylinder body rotates, the volume of plunger cavity is in periodically change
Change, the every rotation of cylinder body one week, each plunger completes an oil suction and pressure oil.
But for high speed plunger pump, the centrifugal force that plunger assembly is born be can not ignore.The revolving speed of high speed plunger pump is logical
Often in 10000rpm or more, such plunger pump has very wide application prospect in fields such as aerospace, robots.With column
The continuous improvement for filling in revolution speed requires also to be continuously improved to the service performance of plunger, since the service performance of plunger is more demanding,
It is also just increasingly stronger for the necessity of the performance study of plunger, high speed is studied at present less, it is generally the case that plunger
Performance study mainly include plunger wear and leakage rate two parts.It has existed for both at home and abroad some for plunger performance study
Testing stand, however existing structure spininess conducts a research to slow-speed of revolution large discharge pump, has ignored centrifugal force at high speeds
Influence to plunger lateral force, although centrifugal forces affect is little when the slow-speed of revolution, in high-revolving situation, centrifugation
Power is very important.
Therefore, how providing a kind of simulation effect, good and high speed plungers pump plunger with centrifugal force application function moves
The problem of testing stand of leakage rate and abrasion condition measurement is those skilled in the art's urgent need to resolve.
Summary of the invention
In view of this, the present invention provides plunger pump movement abrasions and leakage measuring instrumentation test that one kind can apply centrifugal force
Platform applies function by simulating the case where actual plunger pump drives plunger rotation, and with centrifugal force, can be accurately to plunger
It moves leakage rate and abrasion condition carries out simulation test.
To achieve the goals above, the present invention adopts the following technical scheme:
It is a kind of apply centrifugal force plunger pump movement abrasion and leakage measuring instrumentation testing stand, comprising: stage body, main cavity, turn
Dynamic portion, driving portion, plunger cavity, bushing, plunger and screw；
Main chamber body is fixed on the top surface of the stage body；
The rotation section is rotatably connected in the cavity of main chamber body；
The driving portion is arranged inside the stage body, and for driving the rotation section to rotate；
The plunger cavity sealing is fixed at the top of main chamber body；
The bushing is set in the cavity of the plunger cavity, between the plunger cavity inner wall and the bushing side wall
One layer of resin is filled, stepped groove is offered below the inner wall of the bushing, is arranged with sealing ring in the stepped groove；The bushing
The oil pumping hole being connected to the stepped groove is offered with the side wall of the plunger cavity；
The plunger is movably connected in the bushing, and the plunger base is connect with the rotation section, the plunger
It pumps under the drive of the rotation section；
The screw passes through the plunger cavity wall and is fixedly connected with the bushing side wall, and the screw is connected with force
Component.
It moves up and down through the above technical solutions, the present invention drives plunger to realize using driving portion and rotation section, passes through control
Motor processed realizes simulation of the plunger under different rotating speeds, and passes through the connection of screw and bushing, simulates and applies directly on bushing
Outside different size of centrifugal force overcomes traditional testing stand shortage centrifugal force when leakage rate and plunger wear are tested and examines
The defect of worry, simulation effect is good, and test accuracy is high.
Preferably, described in the plunger pump movement abrasion and leakage measuring instrumentation testing stand that above-mentioned one kind can apply centrifugal force
Rotation section includes shaft, swash plate, T-type disk and piston shoes；The shaft bottom is connect with the driving portion；The swash plate is fixed on institute
The top of shaft is stated, the swash plate is the disk of top surface inclination, and edge has upward annular snap edge；The T-type disk
It is fixed on the center of top of the swash plate, and with the annular snap along formation annular slot；The piston shoes are slidably connected at described
In annular slot, and the spherical groove connecting with the plunger is offered at the top of the piston shoes.Swash plate during rotation, by
In being uneven for inclined-plane, piston shoes is made to realize up and down motion in annular slot, and then moved up and down with piston, Neng Gouyou
Effect simulation plunger pump drives plunger rotation, and simulation precision is high.
Preferably, described in the plunger pump movement abrasion and leakage measuring instrumentation testing stand that above-mentioned one kind can apply centrifugal force
Plunger base is spherical structure, and is rotatably connected on the inside of spherical groove.Make to have between plunger and piston shoes sufficiently large
Freedom degree, so that plunger can adapt to angle change of the piston shoes when height changes, smooth degree is higher.
Preferably, described in the plunger pump movement abrasion and leakage measuring instrumentation testing stand that above-mentioned one kind can apply centrifugal force
Driving portion includes motor, torque rotational speed meters and shaft coupling；The motor is fixed on inside the stage body；It is dynamic at the top of the motor
Power output end is connect by the shaft coupling with the torque rotational speed meters；The torque rotational speed meters by the shaft coupling with it is described
The bottom of shaft connects.Effectively improve the driving precision of driving portion.
Preferably, described in the plunger pump movement abrasion and leakage measuring instrumentation testing stand that above-mentioned one kind can apply centrifugal force
Plunger body offers perforative first fuel feed hole of axial direction；The piston shoes are offered and can be connected to first fuel feed hole
Second fuel feed hole, and second fuel feed hole is connected to the annular slot.Can by plunger to piston shoes and annular slot it
Between input hydraulic pressure oil, improve smooth degree when movement, and improve kinematic accuracy.
Preferably, described in the plunger pump movement abrasion and leakage measuring instrumentation testing stand that above-mentioned one kind can apply centrifugal force
It is fixed with plunger chamber lid at the top of plunger cavity, the plunger chamber lid offers the third oil inlet being connected to first fuel feed hole
Hole；Plunger cavity caping end is connected with the inlet connector being connected to the third fuel feed hole.Guarantee the suitable of hydraulic oil injection
Smooth degree.
Preferably, described in the plunger pump movement abrasion and leakage measuring instrumentation testing stand that above-mentioned one kind can apply centrifugal force
The junction of main cavity and the plunger cavity is fixed with the oil returning pipe joint being connected to the cavity of main chamber body, the oil return
Pipe fitting is connect by oil return pumping system with the inlet connector.Hydraulic oil is finally flowed into the cavity of main cavity, is utilized
Oil returning pipe joint is connect by oil return pumping system with the inlet connector, and the iterative cycles that can be realized hydraulic oil utilize.
Preferably, described in the plunger pump movement abrasion and leakage measuring instrumentation testing stand that above-mentioned one kind can apply centrifugal force
The component that exerts a force includes strut, idler wheel, connecting rope and counterweight；The strut is fixed on the top surface of the stage body；The idler wheel rotation
It is connected at the top of the strut, and with the screw in same level；Described connecting rope one end and the fixed company of the screw
It connects, the other end is hung with the counterweight of different number around the idler wheel.It can be convenient for the application of centrifugal force, it is easy to operate,
Effect is obvious.
It can be seen via above technical scheme that compared with prior art, the present disclosure provides one kind can apply centrifugation
The plunger pump movement abrasion of power and leakage measuring instrumentation testing stand, have the advantages that
1, the present invention drives plunger to realize and moves up and down using driving portion and rotation section, realizes that plunger exists by control motor
Simulation under different rotating speeds, and pass through the connection of screw and bushing, simulation applies outward different size of directly on bushing
Centrifugal force overcomes traditional testing stand and lacks the defect that centrifugal force considers, simulation effect when leakage rate and plunger wear are tested
Fruit is good, and test accuracy is high.
2, swash plate of the invention during rotation, due to being uneven for inclined-plane, realizes piston shoes in annular slot
It moves up and down, and then moves up and down with piston, can effectively simulate plunger pump and drive plunger rotation, and simulation precision is high.
3, the present invention is connect by oil return pumping system with the inlet connector using oil returning pipe joint, can pass through plunger
To input hydraulic pressure oil between piston shoes and annular slot, smooth degree when movement is improved, and improve kinematic accuracy, can be realized simultaneously
The iterative cycles of hydraulic oil utilize.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawing is overall structure diagram provided by the invention；
Fig. 2 attached drawing is the structural representation enlarged drawing at the top of stage body provided by the invention；
Fig. 3 attached drawing is the half-sectional main view of structure at the top of stage body provided by the invention；
Fig. 4 attached drawing is the half-sectional shaft side figure of structure at the top of stage body provided by the invention；
Fig. 5 attached drawing is the structural schematic diagram of piston shoes provided by the invention；
Fig. 6 attached drawing is whole main sectional view provided by the invention；
Fig. 7 attached drawing is the main cutaway view Amplified image of plunger coupling part provided by the invention.
Wherein:
01- stage body；
02- main cavity；
The rotation section 03-；
030- shaft；
031- swash plate；
0310- annular snap edge；
032-T type disk；
033- piston shoes；
0330- spherical groove；
The second fuel feed hole of 0331-；
034- annular slot；
035- angular contact ball bearing；
036- spring；
04- driving portion；
040- motor；
041- torque rotational speed meters；
042- shaft coupling；
05- plunger cavity；
06- bushing；
060- stepped groove；
061- sealing ring；
062- oil pumping hole；
07- plunger；
The first fuel feed hole of 070-；
08- screw；
09- force component；
090- strut；
091- idler wheel；
10- plunger chamber lid；
100- third fuel feed hole；
11- inlet connector；
12- oil returning pipe joint.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to attached drawing 1 to attached drawing 7, the embodiment of the invention discloses one kind can apply centrifugal force plunger pump movement abrasion and
Leakage measuring instrumentation testing stand, comprising: stage body 01, main cavity 02, rotation section 03, driving portion 04, plunger cavity 05, bushing 06, plunger
07 and screw 08；
Main cavity 02 is fixed on the top surface of stage body 01；
Rotation section 03 is rotatably connected in the cavity of main cavity 02；
Driving portion 04 is arranged inside stage body 01, and for driving rotation section 03 to rotate；
The sealing of plunger cavity 05 is fixed on 02 top of main cavity；
Bushing 06 is set in the cavity of plunger cavity 05, and one layer is filled between 06 side wall of 05 inner wall of plunger cavity and bushing
The inner wall lower section of resin, bushing 06 offers stepped groove 060, and sealing ring 061 is arranged in stepped groove 060；Bushing 060 and plunger
The side wall of cavity 05 offers the oil pumping hole 062 being connected to stepped groove 060；
Plunger 07 is movably connected in bushing 06, and 07 bottom of plunger is connect with rotation section 03, and plunger 07 is in rotation section 03
Drive under pump；
Screw 08 passes through 05 side wall of plunger cavity and is fixedly connected with 06 side wall of bushing, and screw 08 is connected with force component 09.
It should be noted that stage body 01 is marble material.
In order to further optimize the above technical scheme, rotation section 03 includes shaft 030, swash plate 031, T-type disk 032 and piston shoes
033；030 bottom of shaft is connect with driving portion 04；Swash plate 031 is fixed on the top of shaft 030, and swash plate 031 is top surface inclination
Disk, and edge has upward annular snap along 0311；T-type disk 032 is fixed on the center of top of swash plate 031, and and ring
Shape card forms annular slot 034 along 0311；Piston shoes 033 are slidably connected in annular slot 034, and the top of piston shoes 033 opens up
There is the spherical groove 0330 connecting with plunger 07.
It should be noted that angular contact ball bearing 035 is provided between 02 inner wall of shaft 030 and main cavity, in shaft 030
Also it is arranged with spring 036.
In order to further optimize the above technical scheme, 07 bottom of plunger is spherical structure, and is rotatably connected on spherical groove
In 0330.
In order to further optimize the above technical scheme, driving portion 04 includes motor 040, torque rotational speed meters 041 and shaft coupling
042；Motor 040 is fixed on inside stage body 01；The power output end at 040 top of motor passes through shaft coupling 042 and torque rotational speed meters
041 connection；Torque rotational speed meters 041 are connect by shaft coupling 042 with the bottom of shaft 030.
In order to further optimize the above technical scheme, perforative first fuel feed hole of axial direction is offered inside plunger 07
070；Piston shoes 033 offer the second fuel feed hole 0331 that can be connected to the first fuel feed hole 070, and the second fuel feed hole 0331 and annular
Card slot 034 is connected to.
In order to further optimize the above technical scheme, plunger chamber lid 10, plunger chamber lid 10 are fixed at the top of plunger cavity 05
Offer the third fuel feed hole 100 being connected to the first fuel feed hole 070；10 top of plunger chamber lid is connected with and third fuel feed hole 100
The inlet connector 11 of connection.
In order to further optimize the above technical scheme, the junction of main cavity 02 and plunger cavity 05 is fixed with and main cavity
The oil returning pipe joint 12 of 02 cavity connection, oil returning pipe joint 12 are connect by oil return pumping system with inlet connector 11.
In order to further optimize the above technical scheme, force component 09 includes strut 090, idler wheel 091, connecting rope and weight
Code；Strut 090 is fixed on the top surface of stage body 01；Idler wheel 091 is rotatably connected on 090 top of strut, and with screw 08 in same water
In plane；Connecting rope one end is fixedly connected with screw 08, and the other end is hung with the counterweight of different number around idler wheel 091.
The operation principle of the present invention is that:
The rotation of 040 drive shaft 030 of motor, shaft 030 drive swash plate 031 to rotate, and swash plate 031 is in rotation, due to column
07 limit of plug keeps piston shoes 033 static, and generate opposite movement with annular slot 034, due to swash plate 031 in bushing 06
Inclined surface height it is different, and then plunger 07 is driven to move up and down.The movement of plunger pump can be effectively simulated, moreover, passing through tune
Save the movement of the different frequency of the revolving speed realization plunger 07 of motor 040.
Hydraulic oil enters from inlet connector 11, by the third fuel feed hole 100 opened up in plunger chamber lid 10, flows into plunger
The first fuel feed hole 070 opened up on 07, then by the second fuel feed hole 0331 opened up on piston shoes 033, into annular slot
034, the relative motion of piston shoes 033 is lubricated.
Connecting rope is hung on screw 08, and hangs counterweight around idler wheel 091, applies certain power to bushing 06, in turn
Realize the application to the centrifugal force of plunger 07, be calculated by revolving speed to plunger 07 and service condition should theoretically receive from
Mental and physical efforts, and it is equal to corresponding lateral force, and then adjust the quantity of counterweight, realize the control to centrifugal force.
Hydraulic oil can gradually penetrate into stepped groove 060 when plunger 07 rotates, and extract out, that is, can determine whether by oil pumping hole 062
The amount of leakage that plunger 07 moves.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. plunger pump movement abrasion and leakage measuring instrumentation testing stand that one kind can apply centrifugal force characterized by comprising stage body
(01), main cavity (02), rotation section (03), driving portion (04), plunger cavity (05), bushing (06), plunger (07) and screw
(08)；
Main chamber body (02) is fixed on the top surface of the stage body (01)；
The rotation section (03) is rotatably connected in the cavity of main chamber body (02)；
Driving portion (04) setting is internal in the stage body (01), and for driving the rotation section (03) to rotate；
Plunger cavity (05) sealing is fixed at the top of main chamber body (02)；
The bushing (06) is set in the cavity of the plunger cavity (05), plunger cavity (05) inner wall and the bushing
(06) one layer of resin is filled between side wall, offers stepped groove (060), the stepped groove below the inner wall of the bushing (06)
(060) sealing ring (061) is arranged in；The side wall of the bushing (060) and the plunger cavity (05) offers and the rank
The oil pumping hole (062) of terraced slot (060) connection；
The plunger (07) is movably connected in the bushing (06), and the plunger (07) bottom and the rotation section (03) are even
It connects, the plunger (07) pumps under the drive of the rotation section (03)；
The screw (08) passes through plunger cavity (05) side wall and is fixedly connected with the bushing (06) side wall, the screw
(08) it is connected with force component (09).
2. one kind according to claim 1 can apply plunger pump movement abrasion and the leakage measuring instrumentation testing stand of centrifugal force,
It is characterized in that, the rotation section (03) includes shaft (030), swash plate (031), T-type disk (032) and piston shoes (033)；The shaft
(030) bottom is connect with the driving portion (04)；The swash plate (031) is fixed on the top of the shaft (030), the swash plate
It (031) is the disk of top surface inclination, and edge has upward annular snap along (0311)；The T-type disk (032) is fixed on
The center of top of the swash plate (031), and annular slot (034) is formed along (0311) with the annular snap；The piston shoes (033)
It is slidably connected in the annular slot (034), and offers at the top of the piston shoes (033) and connect with the plunger (07)
Spherical groove (0330).
3. one kind according to claim 2 can apply plunger pump movement abrasion and the leakage measuring instrumentation testing stand of centrifugal force,
It is characterized in that, plunger (07) bottom is spherical structure, and is rotatably connected in the spherical groove (0330).
4. one kind according to claim 2 can apply plunger pump movement abrasion and the leakage measuring instrumentation testing stand of centrifugal force,
It is characterized in that, the driving portion (04) includes motor (040), torque rotational speed meters (041) and shaft coupling (042)；The motor
(040) it is internal to be fixed on the stage body (01)；Power output end at the top of the motor (040) passes through the shaft coupling (042)
It is connect with the torque rotational speed meters (041)；The torque rotational speed meters (041) pass through the shaft coupling (042) and the shaft
(030) bottom connection.
5. the plunger pump movement abrasion of centrifugal force can be applied according to the described in any item one kind of claim 2-4 and leakage measuring instrumentation tries
Test platform, which is characterized in that offer perforative first fuel feed hole (070) of axial direction inside the plunger (07)；The piston shoes
(033) the second fuel feed hole (0331) that can be connected to first fuel feed hole (070), and second fuel feed hole are offered
(0331) it is connected to the annular slot (034).
6. one kind according to claim 5 can apply plunger pump movement abrasion and the leakage measuring instrumentation testing stand of centrifugal force,
Be characterized in that, be fixed with plunger chamber lid (10) at the top of the plunger cavity (05), the plunger chamber lid (10) offer with it is described
The third fuel feed hole (100) of first fuel feed hole (070) connection；Plunger chamber lid (10) top is connected with and the third oil inlet
The inlet connector (11) of hole (100) connection.
7. one kind according to claim 6 can apply plunger pump movement abrasion and the leakage measuring instrumentation testing stand of centrifugal force,
It is characterized in that, the junction of main chamber body (02) and the plunger cavity (05) is fixed with the cavity with main chamber body (02)
The oil returning pipe joint (12) of connection, the oil returning pipe joint (12) are connected by oil return pumping system and the inlet connector (11)
It connects.
8. one kind according to claim 1 can apply plunger pump movement abrasion and the leakage measuring instrumentation testing stand of centrifugal force,
It is characterized in that, the force component (09) includes strut (090), idler wheel (091), connecting rope and counterweight；The strut (090) is solid
It is scheduled on the top surface of the stage body (01)；The idler wheel (091) is rotatably connected at the top of the strut (090), and with the screw
(08) in same level；Described connecting rope one end is fixedly connected with the screw (08), and the other end bypasses the idler wheel
(091) it is hung with the counterweight of different number.
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|---|---|---|---|---|
| CN115855467A (en) * | 2022-12-07 | 2023-03-28 | 浙江大学 | Single-plunger piston shoe assembly test bench with reciprocating type return stroke structure |
| CN115855467B (en) * | 2022-12-07 | 2023-08-29 | 浙江大学 | Single-plunger sliding shoe assembly test bench with reciprocating return structure |
| CN115615686A (en) * | 2022-12-14 | 2023-01-17 | 浙江大学 | Inner curve hydraulic motor multi-plunger assembly testing device and testing method |
| CN115615686B (en) * | 2022-12-14 | 2023-03-31 | 浙江大学 | Inner curve hydraulic motor multi-plunger assembly testing device and testing method |
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| CN110425124B (en) | 2020-08-11 |
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