CN110425124B - Plunger pump motion abrasion and leakage measurement test bed capable of applying centrifugal force - Google Patents
Plunger pump motion abrasion and leakage measurement test bed capable of applying centrifugal force Download PDFInfo
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- CN110425124B CN110425124B CN201910654710.9A CN201910654710A CN110425124B CN 110425124 B CN110425124 B CN 110425124B CN 201910654710 A CN201910654710 A CN 201910654710A CN 110425124 B CN110425124 B CN 110425124B
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- plunger
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- centrifugal force
- bushing
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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
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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
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a plunger pump motion abrasion and leakage measuring test bed capable of applying centrifugal force, which comprises: the main cavity is fixed on the top surface of the table body; the rotating part is rotatably connected in the cavity of the main cavity body; the driving part is arranged in the table body and is used for driving the rotating part to rotate; the plunger cavity is fixed on the top of the main cavity in a sealing way; the bushing is sleeved in a cavity of the plunger cavity, a layer of resin is filled between the inner wall of the plunger cavity and the side wall of the bushing, a stepped groove is formed below the inner wall of the bushing, and a sealing ring is sleeved in the stepped groove; the side walls of the bush and the plunger cavity are provided with oil pumping holes communicated with the stepped groove; the plunger is movably connected in the bushing, the bottom of the plunger is connected with the rotating part, and the plunger is driven by the rotating part to reciprocate up and down; the screw passes plunger cavity lateral wall and bush lateral wall fixed connection, and the screw connection has the application of force subassembly. The invention overcomes the defect that the traditional test bed lacks centrifugal force consideration during leakage amount and plunger abrasion tests, and has good simulation effect and high test precision.
Description
Technical Field
The invention relates to the technical field of plunger motion simulation tests, in particular to a plunger pump motion abrasion and leakage measurement test bed capable of applying centrifugal force.
Background
At present, plungers are used primarily in pumps or compressors for transporting fluids. The swash plate type axial plunger pump mainly comprises a main shaft, a cylinder body, a plunger, a sliding shoe, a return plate, a swash plate and the like; the working principle is as follows: under the drive of the motor, the main shaft drives the cylinder body to rotate through spline connection, the cylinder body drives the plunger to rotate, the plunger reciprocates in the cylinder hole under the action of the swash plate and the return plate, and the piston shoes are arranged at the heads of the plungers, so that the bottoms of the piston shoes are always kept attached to the swash plate under the action of the return plate. In order to realize accurate switching between the reciprocating motion of the plunger and oil suction and pressure oil, a fixed flow distribution disc is arranged between the flow distribution end surface of the cylinder body and the oil suction port and the oil pressure port of the pump, and the flow distribution disc is tightly attached to the cylinder body to slide relatively. When the cylinder body rotates, the volume of the plunger cavity changes periodically, and each plunger finishes oil absorption and oil pressing once when the cylinder body rotates for a circle.
However, for high speed plunger pumps, the centrifugal forces experienced by the plunger assembly are not negligible. The rotating speed of the high-speed plunger pump is usually more than 10000rpm, and the plunger pump has wide application prospect in the fields of aerospace, robots and the like. Along with the continuous improvement of the rotating speed of the plunger pump, the service performance requirement of the plunger is also continuously improved, the necessity of the performance research of the plunger is stronger and stronger due to the higher service performance requirement of the plunger, the high-speed research is less at present, and the performance research of the plunger mainly comprises two parts of plunger abrasion and leakage amount under the common condition. Some test beds for plunger performance research already exist at home and abroad, however, the existing structure is mainly developed for pumps with low rotating speed and large displacement, the influence of centrifugal force on lateral force of the plunger at high speed is ignored, and although the influence of the centrifugal force is not large at low rotating speed, the centrifugal force is not ignored at high rotating speed.
Therefore, it is an urgent need to solve the problems of the art to provide a test bed for measuring the leakage amount and the abrasion condition of the plunger movement of the high-speed plunger pump with a good simulation effect and a centrifugal force applying function.
Disclosure of Invention
In view of the above, the invention provides a test bed for measuring the motion wear and the leakage of a plunger pump, which can apply a centrifugal force, and can accurately perform a simulation test on the motion leakage amount and the wear condition of the plunger by simulating the actual condition that the plunger pump drives a plunger to rotate and having a centrifugal force application function.
In order to achieve the purpose, the invention adopts the following technical scheme:
a plunger pump kinematic wear and leakage measurement test rig to which centrifugal force may be applied, comprising: the device comprises a table body, a main cavity, a rotating part, a driving part, a plunger cavity, a bushing, a plunger and a screw;
the main cavity is fixed on the top surface of the table body;
the rotating part is rotatably connected in the cavity of the main cavity;
the driving part is arranged in the table body and is used for driving the rotating part to rotate;
the plunger cavity is fixed on the top of the main cavity in a sealing manner;
the bushing is sleeved in the cavity of the plunger cavity, a layer of resin is filled between the inner wall of the plunger cavity and the side wall of the bushing, a stepped groove is formed below the inner wall of the bushing, and a sealing ring is sleeved in the stepped groove; the side walls of the bush and the plunger cavity are provided with oil pumping holes communicated with the stepped groove;
the plunger is movably connected in the bushing, the bottom of the plunger is connected with the rotating part, and the plunger is driven by the rotating part to reciprocate up and down;
the screw penetrates through the side wall of the plunger cavity and is fixedly connected with the side wall of the bushing, and the screw is connected with a force application assembly.
According to the technical scheme, the driving part and the rotating part are adopted to drive the plunger to move up and down, the simulation of the plunger at different rotating speeds is realized by controlling the motor, outward centrifugal forces with different sizes are directly simulated and applied on the bushing through the connection of the screw and the bushing, the defect that the traditional test bed is lack of centrifugal force consideration during leakage amount and plunger abrasion tests is overcome, the simulation effect is good, and the test precision is high.
Preferably, in the above-described plunger pump kinetic wear and leakage measurement test stand to which a centrifugal force can be applied, the rotating portion includes a rotating shaft, a swash plate, a T-shaped plate, and a shoe; the bottom of the rotating shaft is connected with the driving part; the swash plate is fixed on the top of the rotating shaft, is a disc with an inclined top surface, and has an annular clamping edge protruding upwards at the edge; the T-shaped disc is fixed in the center of the top of the swash plate and forms an annular clamping groove with the annular clamping edge; the piston shoes are connected in the annular clamping grooves in a sliding mode, and spherical grooves connected with the plungers are formed in the tops of the piston shoes. In the rotating process of the swash plate, the inclined plane is uneven, so that the sliding shoes move up and down in the annular clamping grooves, the pistons are driven to move up and down, the plunger pump can be effectively simulated to drive the plungers to rotate, and the simulation precision is high.
Preferably, in the above test bed for measuring kinetic wear and leakage of the plunger pump capable of applying centrifugal force, the bottom of the plunger is of a spherical structure and is rotatably connected in the spherical groove. The plunger and the sliding shoe can have enough degree of freedom, so that the plunger can adapt to angle change of the sliding shoe during height change, and the smoothness is higher.
Preferably, in the above plunger pump kinetic wear and leakage measurement test stand capable of applying centrifugal force, the driving part includes a motor, a torque tachometer and a coupling; the motor is fixed inside the table body; the power output end at the top of the motor is connected with the torque tachometer through the coupler; the torque tachometer is connected with the bottom of the rotating shaft through the coupler. The driving precision of the driving part is effectively improved.
Preferably, in the test bed for measuring the motion wear and the leakage of the plunger pump capable of applying the centrifugal force, a first oil inlet hole penetrating through the plunger in the axial direction is formed in the plunger; and the sliding shoe is provided with a second oil inlet which can be communicated with the first oil inlet, and the second oil inlet is communicated with the annular clamping groove. Can pass through the plunger to input hydraulic oil between piston shoes and the ring groove, improve the smooth and easy degree during the motion to improve the motion precision.
Preferably, in the test bed for measuring the moving wear and the leakage of the plunger pump capable of applying the centrifugal force, a plunger cavity cover is fixed at the top of the plunger cavity body, and the plunger cavity cover is provided with a third oil inlet hole communicated with the first oil inlet hole; and the top end of the plunger cavity cover is connected with an oil inlet pipe joint communicated with the third oil inlet hole. The smoothness of hydraulic oil injection is ensured.
Preferably, in the above test bed for measuring motion wear and leakage of the plunger pump capable of applying centrifugal force, an oil return pipe joint communicated with the cavity of the main cavity is fixed at the joint of the main cavity and the plunger cavity, and the oil return pipe joint is connected with the oil inlet pipe joint through an oil return pump system. Hydraulic oil finally flows into the cavity of the main cavity, and the oil return pipe joint is connected with the oil inlet pipe joint through an oil return pump system, so that the repeated cyclic utilization of the hydraulic oil can be realized.
Preferably, in the above plunger pump motion wear and leakage measurement test bed capable of applying centrifugal force, the force application assembly comprises a support rod, a roller, a connecting rope and a weight; the supporting rod is fixed on the top surface of the table body; the roller is rotatably connected to the top of the support rod and is on the same horizontal plane with the screw; one end of the connecting rope is fixedly connected with the screw, and the other end of the connecting rope bypasses the roller wheel to suspend different quantities of weights. The centrifugal force can be conveniently applied, the operation is simple, and the effect is obvious.
Compared with the prior art, the invention discloses a plunger pump motion abrasion and leakage measurement test bed capable of applying centrifugal force, and the test bed has the following beneficial effects:
1. the invention adopts the driving part and the rotating part to drive the plunger piston to realize the up-and-down movement, realizes the simulation of the plunger piston at different rotating speeds by controlling the motor, directly simulates and applies outward centrifugal forces with different sizes on the bushing by connecting the screw and the bushing, overcomes the defect that the traditional test bed lacks the centrifugal force to consider during the leakage amount and plunger piston abrasion test, and has good simulation effect and high test precision.
2. In the rotating process of the swash plate, the slide shoes move up and down in the annular clamping grooves due to the uneven height of the inclined surfaces, so that the pistons are driven to move up and down, the plunger pump can be effectively simulated to drive the plungers to rotate, and the simulation precision is high.
3. According to the invention, the oil return pipe joint is connected with the oil inlet pipe joint through the oil return pump system, hydraulic oil can be input between the sliding shoes and the annular clamping groove through the plunger, the smoothness degree during movement is improved, the movement precision is improved, and meanwhile, the repeated cyclic utilization of the hydraulic oil can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure provided by the present invention;
FIG. 2 is an enlarged view of the top of the table body according to the present invention;
FIG. 3 is a front view, partly in section, of the structure of the table top according to the present invention;
FIG. 4 is a side view, partly in section, of the structure of the table top according to the invention;
FIG. 5 is a schematic structural view of a slipper provided by the present invention;
FIG. 6 is an overall front cross-sectional view of the present invention;
figure 7 is an enlarged view of the main cross-section of the plunger connecting portion provided by the present invention.
Wherein:
01-a table body;
02-a main cavity;
03-a turning part;
030-spindle;
031-a swash plate;
0311-a ring-shaped clamp rim;
032-T disk;
033-a slipper;
0330-a spherical recess;
0331-a second oil inlet hole;
034-ring groove;
035-angular contact ball bearings;
036-spring; 04-a driving part;
040-motor;
041-torque tachometer;
042-coupling;
05-plunger cavity;
06-a lining;
060-step trough;
061-sealing ring;
062-oil pumping hole;
07-a plunger;
070-a first oil inlet;
08-screw;
09-a force application component;
090-struts;
091-rollers;
10-plunger chamber cover;
100-a third oil inlet hole;
11-an oil inlet pipe joint;
12-oil return pipe joint.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 7, the embodiment of the invention discloses a plunger pump motion wear and leakage measuring test bed capable of applying centrifugal force, comprising: the device comprises a table body 01, a main cavity 02, a rotating part 03, a driving part 04, a plunger cavity 05, a bushing 06, a plunger 07 and a screw 08;
the main cavity 02 is fixed on the top surface of the table body 01;
the rotating part 03 is rotatably connected in the cavity of the main cavity 02;
the driving part 04 is arranged inside the table body 01 and is used for driving the rotating part 03 to rotate;
the plunger cavity 05 is hermetically fixed at the top of the main cavity 02;
the bushing 06 is sleeved in the cavity of the plunger cavity 05, a layer of resin is filled between the inner wall of the plunger cavity 05 and the side wall of the bushing 06, a step groove 060 is formed below the inner wall of the bushing 06, and a sealing ring 061 is sleeved in the step groove 060; the side walls of the bush 060 and the plunger cavity 05 are provided with oil pumping holes 062 communicated with the stepped groove 060;
the plunger 07 is movably connected in the bush 06, the bottom of the plunger 07 is connected with the rotating part 03, and the plunger 07 reciprocates up and down under the drive of the rotating part 03;
the screw 08 penetrates through the side wall of the plunger cavity 05 to be fixedly connected with the side wall of the bushing 06, and the screw 08 is connected with a force application assembly 09.
The table 01 is made of marble.
In order to further optimize the above technical solution, the rotating portion 03 includes a rotating shaft 030, a swash plate 031, a T-shaped plate 032, and a slipper 033; the bottom of the rotating shaft 030 is connected with the driving part 04; the swash plate 031 is fixed on the top of the rotating shaft 030, the swash plate 031 is a disc with an inclined top surface, and the edge of the swash plate 031 is provided with an annular clamping edge 0311 protruding upwards; the T-shaped plate 032 is fixed at the center of the top of the swash plate 031, and forms an annular clamping groove 034 with the annular clamping edge 0311; the skid shoe 033 is slidably connected in the annular clamping groove 034, and a spherical groove 0330 connected with the plunger 07 is formed in the top of the skid shoe 033.
It should be noted that an angular contact ball bearing 035 is disposed between the rotating shaft 030 and the inner wall of the main cavity 02, and a spring 036 is further sleeved on the rotating shaft 030.
In order to further optimize the technical scheme, the bottom of the plunger 07 is of a spherical structure and is rotatably connected in the spherical groove 0330.
In order to further optimize the above technical solution, the driving part 04 includes a motor 040, a torque tachometer 041 and a coupling 042; the motor 040 is fixed inside the table body 01; the power output end at the top of the motor 040 is connected with the torque tachometer 041 through a coupler 042; the torque tachometer 041 is connected to the bottom of the rotating shaft 030 through a coupling 042.
In order to further optimize the technical scheme, a first oil inlet hole 070 penetrating in the axial direction is formed in the plunger 07; the skid shoe 033 is provided with a second oil inlet hole 0331 which is communicated with the first oil inlet hole 070, and the second oil inlet hole 0331 is communicated with the annular clamping groove 034.
In order to further optimize the technical scheme, a plunger cavity cover 10 is fixed at the top of the plunger cavity 05, and the plunger cavity cover 10 is provided with a third oil inlet hole 100 communicated with the first oil inlet hole 070; the top end of the plunger cavity cover 10 is connected with an oil inlet pipe joint 11 communicated with the third oil inlet hole 100.
In order to further optimize the technical scheme, an oil return pipe joint 12 communicated with the cavity of the main cavity 02 is fixed at the joint of the main cavity 02 and the plunger cavity 05, and the oil return pipe joint 12 is connected with the oil inlet pipe joint 11 through an oil return pump system.
In order to further optimize the technical scheme, the force application assembly 09 comprises a strut 090, a roller 091, a connecting rope and a weight; the strut 090 is fixed on the top surface of the table body 01; the roller 091 is rotatably connected to the top of the strut 090 and is on the same horizontal plane with the screw 08; one end of the connecting rope is fixedly connected with the screw 08, and weights with different numbers are hung at the other end of the connecting rope by bypassing the roller 091.
The working principle of the invention is as follows:
Hydraulic oil enters from the oil inlet pipe joint 11, flows into the first oil inlet hole 070 formed in the plunger 07 through the third oil inlet hole 100 formed in the plunger cavity cover 10, then enters the annular clamping groove 034 through the second oil inlet hole 0331 formed in the slipper 033, and lubricates the relative movement of the slipper 033.
The connecting rope is hung on the screw 08, the weight is hung around the roller 091, a certain force is applied to the bushing 06, then the application of the centrifugal force on the plunger 07 is realized, the centrifugal force which should be theoretically applied is obtained through calculation of the rotating speed and the use condition of the plunger 07, the centrifugal force is equal to the corresponding lateral force, the number of the weights is further adjusted, and the control of the centrifugal force is realized.
When the plunger 07 rotates, the hydraulic oil gradually permeates into the stepped groove 060 and is pumped out through the oil pumping hole 062, and then the leakage amount of the movement of the plunger 07 can be judged.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A plunger pump kinematic wear and leakage measurement test rig to which centrifugal force may be applied, comprising: the device comprises a table body (01), a main cavity (02), a rotating part (03), a driving part (04), a plunger cavity (05), a bushing (06), a plunger (07) and a screw (08);
the main cavity (02) is fixed on the top surface of the table body (01);
the rotating part (03) is rotatably connected in the cavity of the main cavity body (02);
the driving part (04) is arranged in the table body (01) and is used for driving the rotating part (03) to rotate;
the plunger cavity (05) is hermetically fixed at the top of the main cavity (02);
the bushing (06) is sleeved in a cavity of the plunger cavity (05), a layer of resin is filled between the inner wall of the plunger cavity (05) and the side wall of the bushing (06), a step groove (060) is formed below the inner wall of the bushing (06), and a sealing ring (061) is sleeved in the step groove (060); the side walls of the bush (060) and the plunger cavity (05) are provided with oil pumping holes (062) communicated with the stepped groove (060);
the plunger (07) is movably connected in the bushing (06), the bottom of the plunger (07) is connected with the rotating part (03), and the plunger (07) is driven by the rotating part (03) to reciprocate up and down;
the screw (08) penetrates through the side wall of the plunger cavity (05) and is fixedly connected with the side wall of the bushing (06), and the screw (08) is connected with a force application assembly (09).
2. The plunger pump motion wear and leakage measurement test bench capable of applying centrifugal force according to claim 1, characterized in that the rotating part (03) comprises a rotating shaft (030), a swash plate (031), a T-shaped plate (032) and a skid shoe (033); the bottom of the rotating shaft (030) is connected with the driving part (04); the swash plate (031) is fixed on the top of the rotating shaft (030), the swash plate (031) is a disc with an inclined top surface, and the edge of the swash plate is provided with an annular clamping edge (0311) which protrudes upwards; the T-shaped plate (032) is fixed in the center of the top of the swash plate (031), and forms an annular clamping groove (034) with the annular clamping edge (0311); the sliding shoes (033) are connected in the annular clamping groove (034) in a sliding mode, and spherical grooves (0330) connected with the plungers (07) are formed in the tops of the sliding shoes (033).
3. The plunger pump motion wear and leakage measurement test bench capable of applying centrifugal force according to claim 2, characterized in that the bottom of the plunger (07) is of spherical structure and is rotatably connected in the spherical groove (0330).
4. The plunger pump kinematic wear and leakage measurement test bench capable of applying centrifugal force according to claim 2, characterized in that the driving part (04) comprises a motor (040), a torque tachometer (041) and a coupling (042); the motor (040) is fixed inside the table body (01); the power output end at the top of the motor (040) is connected with the torque tachometer (041) through the coupling (042); the torque tachometer (041) is connected with the bottom of the rotating shaft (030) through the coupler (042).
5. The plunger pump motion wear and leakage measuring test bed capable of applying centrifugal force according to any one of claims 2-4, characterized in that a first oil inlet hole (070) penetrating in the axial direction is formed in the plunger (07); the skid shoes (033) are provided with second oil inlet holes (0331) which are communicated with the first oil inlet holes (070), and the second oil inlet holes (0331) are communicated with the annular clamping grooves (034).
6. The plunger pump motion wear and leakage measurement test bed capable of applying centrifugal force according to claim 5, characterized in that a plunger cavity cover (10) is fixed on the top of the plunger cavity (05), and the plunger cavity cover (10) is provided with a third oil inlet hole (100) communicated with the first oil inlet hole (070); and the top end of the plunger cavity cover (10) is connected with an oil inlet pipe joint (11) communicated with the third oil inlet hole (100).
7. The plunger pump motion wear and leakage measurement test bed capable of applying centrifugal force according to claim 6, characterized in that an oil return pipe joint (12) communicated with the cavity of the main cavity body (02) is fixed at the joint of the main cavity body (02) and the plunger cavity body (05), and the oil return pipe joint (12) is connected with the oil inlet pipe joint (11) through an oil return pump system.
8. The plunger pump kinematic wear and leakage measurement test bench capable of applying centrifugal force according to claim 1, characterized in that the force application assembly (09) comprises a strut (090), a roller (091), a connecting rope and a weight; the strut (090) is fixed on the top surface of the table body (01); the roller (091) is rotatably connected to the top of the strut (090) and is on the same horizontal plane with the screw (08); one end of the connecting rope is fixedly connected with the screw (08), and the other end of the connecting rope bypasses the roller (091) and hangs different numbers of weights.
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| CN201910654710.9A CN110425124B (en) | 2019-07-19 | 2019-07-19 | Plunger pump motion abrasion and leakage measurement test bed capable of applying centrifugal force |
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| CN201910654710.9A CN110425124B (en) | 2019-07-19 | 2019-07-19 | Plunger pump motion abrasion and leakage measurement test bed capable of applying centrifugal force |
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| CN110425124B true CN110425124B (en) | 2020-08-11 |
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| CN115855467B (en) * | 2022-12-07 | 2023-08-29 | 浙江大学 | Single-plunger sliding shoe assembly test bench with reciprocating return structure |
| 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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| CN102312830A (en) * | 2011-10-13 | 2012-01-11 | 哈尔滨工业大学 | Performance testing device for piston shoe in axial plunger pump |
| CN102562566A (en) * | 2012-01-20 | 2012-07-11 | 哈尔滨工业大学 | Mechanical device for measuring leakage amount between plunger and cylinder body hole in plunger pump |
| US9879667B2 (en) * | 2014-03-03 | 2018-01-30 | Danfoss Power Solutions Inc. | Variable load sense spring setting for axial piston open circuit pump |
| CN104074734B (en) * | 2014-07-02 | 2016-08-17 | 哈尔滨工业大学 | The oil film experimental apparatus for testing of plunger pair in a kind of plunger displacement pump |
| CN109026650B (en) * | 2018-08-30 | 2023-11-10 | 华南理工大学 | Axial plunger pump swash plate-sliding shoe friction pair abrasion testing device and testing method thereof |
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