CN108266362B - Constant pressure pump test platform and test method - Google Patents
Constant pressure pump test platform and test method Download PDFInfo
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- CN108266362B CN108266362B CN201711480143.7A CN201711480143A CN108266362B CN 108266362 B CN108266362 B CN 108266362B CN 201711480143 A CN201711480143 A CN 201711480143A CN 108266362 B CN108266362 B CN 108266362B
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- 238000012360 testing method Methods 0.000 title claims abstract description 86
- 238000010998 test method Methods 0.000 title claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 239000002828 fuel tank Substances 0.000 claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 claims abstract description 12
- 230000008676 import Effects 0.000 claims abstract description 8
- 238000005259 measurement Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 230000008054 signal transmission Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 abstract 2
- 239000010705 motor oil Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention provides a kind of constant pressure pump test platform, it be used to detect constant pressure pump, including synchronous belt, motor, load circuit, transmission shaft one, transmission shaft two and fuel tank, load circuit includes accompanying examination motor and proportional pressure control valve, motor and constant pressure pump are arranged on transmission shaft one, and examination motor is accompanied to be arranged on transmission shaft two；Transmission shaft one is connect by synchronous belt with transmission shaft two, inlet port and oil return opening are provided on fuel tank, inlet port is divided into two-way after connecting by pipeline with constant pressure pump, the import of proportional pressure control valve is connected all the way, another way connection is connect with oil return opening again after accompanying the import of examination motor, the outlet of proportional pressure control valve to connect with the outlet for accompanying examination motor；The present invention also provides a kind of constant pressure pump test methods, and examination motor is accompanied to absorb most of flow of constant pressure pump output, and will flow through the hydraulic energy transfer for accompanying examination motor oil liquid is kinetic energy, again constant pressure pump is passed to, realizes energy regenerating, the present invention is simple and convenient, it can complete to detect by controller, it is easy to operate.
Description
Technical field
The present invention relates to a kind of test methods of constant pressure pump, more specifically to a kind of constant pressure pump test platform and test
Method.
Background technique
Constant pressure pump is a kind of hydraulic pump with pressure compensation, and constant pressure pump is in constant current operating condition, the flow of constant pressure pump
It remains unchanged；Into after pressure compensation operating condition, constant pressure pump flow according to needed for system adjusts its flow value.Perseverance specified in national standard
Press pump test method is loaded by throttle valve, and constant pressure pump output flow all passes through throttle valve, is thermal energy by hydraulic energy transfer, is made
At the waste of energy.Flow rate pressure gain of the constant pressure pump in constant pressure operating condition is larger, is difficult to obtain energy by overflow valve load
Enough reflect each flow operating point of constant pressure pump performance.Being emptied in hydraulic system can cause cavitation, and cavitation can be to liquid
Pressure element causes to damage, and influences component life.
Therefore, it is necessary to improve to the prior art.
Summary of the invention
It is an object of the invention to overcome defect of the existing technology, propose a kind of efficient constant pressure pump test platform and
Test method.
In order to solve the above technical problems, the present invention provides a kind of constant pressure pump test platform, it be used to detect constant pressure pump, including
Synchronous belt, motor, load circuit, transmission shaft one, transmission shaft two and fuel tank；
The load circuit includes accompanying examination motor and proportional pressure control valve；The motor and constant pressure pump are arranged in transmission shaft one
On；It is described that examination motor is accompanied to be arranged on transmission shaft two；Transmission shaft one is connect by synchronous belt with transmission shaft two；
Inlet port and oil return opening are provided on the fuel tank；The inlet port is divided into two after connecting by pipeline with constant pressure pump
Road, connects the import of proportional pressure control valve all the way, and the import of examination motor is accompanied in another way connection；The outlet of the proportional pressure control valve with accompany
It is connect again with oil return opening after the outlet connection of examination motor.
As the improvement to constant pressure pump test platform of the present invention: further including measuring cell；The measuring cell includes pressure
Sensor one, pressure sensor two, flowmeter and rotational speed and torque instrument；The rotational speed and torque instrument is arranged on transmission shaft one；It is described
Pressure sensor two is arranged on the pipeline between inlet port and constant pressure pump；The outlet of the constant pressure pump is passed by pipeline and pressure
Sensor one and flowmeter are divided into two-way after being sequentially connected.
As the further improvement to constant pressure pump test platform of the present invention: further including controller；The controller and driving
Element accompanies examination motor, proportional pressure control valve, pressure sensor one, pressure sensor two, flowmeter and the electrical connection of rotational speed and torque instrument.
As the further improvement to constant pressure pump test platform of the present invention: the motor is variable-frequency motor.
The present invention also provides a kind of test methods of constant pressure pump, comprising the following steps:
1), in the controller setting accompany examination the initial flow of motor, the initial pressure set value of proportional pressure control valve, threshold value and
The pressure of constant pressure operating condition is arranged in steady state value in constant pressure pump, opens driving element, and driving element drives transmission shaft one to rotate, and drives
Dynamic constant pressure pump work；Rotational speed and torque instrument detects the velocity of rotation of transmission shaft one, converts electric signal transmission for the physical quantity measured
To controller；
2), after constant pressure pump work, the oil liquid in fuel tank is extracted out by inlet port, oil liquid flows after pressure sensor two
Enter constant pressure pump, oil liquid is flowed out from the outlet of constant pressure pump later, is divided into two-way after pressure sensor one and flowmeter；Pressure passes
The measurement of sensor two flows into the pressure of the oil liquid of constant pressure pump from inlet port, and as test pressure, pressure sensor one is measured from constant pressure
The pressure of the oil liquid of pump discharge outflow；The flow for the oil liquid that flowmeter measurement goes out from constant pressure pump outlet flow, the stream as constant pressure pump
Amount；Pressure sensor one, pressure sensor two and flowmeter convert electric signal transmission to controller for the physical quantity measured；
3), oil liquid is divided into two-way, wherein being accompanied examination motor on transmission shaft two all the way, examination motor is accompanied to drive two turns of transmission shaft
Dynamic, transmission shaft two drives transmission shaft one to rotate by transmission belt, drives constant pressure pump work, adjusts the output power of driving element,
Dump power needed for driving element inputs constant pressure pump constant rotation to transmission shaft, makes constant pressure pump obtain enough input powers,
Oil liquid another way flows through proportional pressure control valve；One is accumulated from proportional pressure control valve and from the oil liquid for the outlet outflow for accompanying examination motor later
Fuel tank is flowed back to from oil return opening in road；
4), starting detection during oil liquid flows, to test pressure from initial pressure 0 to constant pressure pump constant pressure operating condition
Pressure is divided into n etc. points as test point；Test pressure is controlled by proportional pressure control valve by controller at this time, makes to test pressure
It is begun to ramp up from initial pressure 0；Constant pressure pump is constant current operating condition at this time, and the part oil liquid of the outlet outflow of constant pressure pump, which flows through, accompanies examination horse
It reaches, another part oil liquid flows through proportional pressure control valve；Examination motor starting flow tracking control is accompanied in controller control, makes to accompany examination motor
Input flow rate is that the flow of constant pressure pump subtracts steady state value, and the input flow rate of proportional pressure control valve is steady state value at this time；Controller later
It is monitored by flow of the flowmeter to the constant pressure pump of each test point, if the constant pressure pump of a test point and a upper test point
Flow difference be higher than threshold value, then controller using the test point be used as inflection point, accompany try motor no longer receive flow tracking control, and
And constant pressure pump terminates constant current operating condition；Controller, which is recorded to turn our controller and be conveyed to, accompanies the flow of examination motor as accompanying examination motor
The flow value of flowmeter when inflection point flow and controller record inflection point；
5), constant pressure pump enters constant pressure operating condition later, and whole oil liquid of the outlet outflow of constant pressure pump, which flow through, accompanies examination motor, does not flow
Proportional pressure control valve is crossed, examination motor is accompanied to absorb whole flows from constant pressure pump, the flow of constant pressure pump is to accompany examination motor at this time
Flow；The flow for accompanying examination motor is reduced by controller, to reduce the flow of constant pressure pump, tests pressure at this time with constant pressure pump
The reduction of flow and rise；Until accompanying the flow of examination motor until 0, the flow of constant pressure pump is also reduced to zero, and tests pressure
The pressure of power arrival constant pressure pump constant pressure operating condition；
6), lead to when test pressure reaches the pressure of constant pressure pump constant pressure operating condition after the flow of constant pressure pump reaches minimum flow 0
It crosses controller and rises the flow for accompanying examination motor, to rise the flow of constant pressure pump, at this time test pressure with the flow of constant pressure pump
Rise and declines；To accompany the minimum flow 0 of examination motor to the inflection point flow for accompanying examination motor, it is divided into several equal parts and works as flow
Point；In each flow operating point, controller control test pressure stops some time, to pressure sensor one, pressure sensor
Two and the data stabilization that shows of flowmeter after record；
7), when accompanying the flow of examination motor to rise to inflection point flow, while testing pressure and drop to minimum pressure 0, test
Process terminates；Controller is sequentially connected the pressure value of the pressure sensor one that each flow operating point measures, pressure sensor two
Pressure value and flowmeter and flow value, are depicted as curve, and detection is completed；Driving element is closed, examination motor will be accompanied by controller
Flow be adjusted to zero, constant pressure pump tapers off work.
The technical advantage of constant pressure pump test platform of the present invention and test method is:
1, energy recovery function will flow through by accompanying examination motor to absorb most of flow of constant pressure pump output and accompany examination motor
The hydraulic energy transfer of oil liquid is kinetic energy, realizes energy regenerating.
2, safety, proportional pressure control valve can play the role of safety valve, system avoided to overload.
3, simple and convenient, it can complete to detect by controller, it is easy to operate.
4, adaptivity, can automatic identification constant pressure pump inflection point, measure the complete flow-pressure diagram of constant pressure pump.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 is the overall structure diagram of constant pressure pump test platform of the present invention.
Specific embodiment
The present invention is described further combined with specific embodiments below, but protection scope of the present invention is not limited in
This.
Embodiment 1, constant pressure pump test platform, be used to detect constant pressure pump 1, as shown in Figure 1, include synchronous belt 5, motor 6,
Circuit, measuring cell, transmission shaft 1, transmission shaft 2 92, fuel tank 10 and controller are loaded, is provided with inlet port 11 on fuel tank 10
With oil return opening 12.Load circuit include accompany examination motor 7 and proportional pressure control valve 8, measuring cell include pressure sensor 1, pressure
Sensor 2 32, flowmeter 2 and rotational speed and torque instrument 4.Motor 6, constant pressure pump 1 and rotational speed and torque instrument 4 are all disposed within transmission shaft 1
On, it can be rotated with identical rate, rotational speed and torque instrument 4 detects the velocity of rotation of transmission shaft 1.The examination setting of motor 7 is accompanied to be driven
On axis 2 92, transmission shaft 2 92 is connect by synchronous belt 5 with transmission shaft 1, and synchronous belt 5 plays the role of linkage, synchronous belt 5
Enable transmission shaft 1 and transmission shaft 2 92 to rotate in same direction at the same speed.Examination motor 7 is accompanied to absorb the major part or complete that constant pressure pump 1 exports
Hydraulic energy transfer is kinetic energy and drives constant pressure pump 1, realizes energy regenerating by portion's flow.Inlet port 11 passes through pressure sensor two
With the inlet communication of constant pressure pump 1 after 32, pressure sensor 2 32 is for measuring the oil liquid pressure into constant pressure pump 1.Constant pressure pump 1
Outlet is separated into two-way after successively connecting with pressure sensor 1 and flowmeter 2.The import of proportional pressure control valve 8 is connected all the way,
The import of examination motor 7 is accompanied in another way connection, and the outlet of proportional pressure control valve 8 later converges after connecting again with the outlet of examination motor 7 is accompanied
It is integrated to be connect again with oil return opening 12 all the way.The pressure that pressure sensor 31 is used to measure the oil liquid flowed out from constant pressure pump 1 (is as surveyed
Pressure testing power), flowmeter 2 is used to measure the flow (the as flow of constant pressure pump 1) of the oil liquid flowed out from constant pressure pump 1.
Proportional pressure control valve 8 accompanies examination motor 7, pressure sensor 1, pressure sensor 2 32, rotational speed and torque instrument 4 and flow
Meter 2 is all connected with controller, and pressure sensor 1, pressure sensor 2 32, rotational speed and torque instrument 4 and flowmeter 2 are by acquisition
Information is converted to electric signal and sends controller to, and controller exports electric signal to proportional pressure control valve 8 and accompanies examination motor 7, controller
It also can control test pressure of the invention, controller uses siemens PLC series of PLC.Motor 6 is used as power compensation element,
Power needed for compensation constant pressure pump 1 and the difference for accompanying examination 7 regenerative power of motor, enable subject constant pressure pump 1 to obtain enough
Input power.
Accompanying examination motor 7 that will flow through accompanies the hydraulic energy of the oil liquid of examination motor 7 to recycle, and is converted to mechanical energy, drives transmission shaft two
92 rotations, synchronous belt 5 transmit mechanical energy, and transmission shaft 2 92 rotates transmission shaft 1 at the same speed by synchronous belt 5.
Pressure of the pressure that pressure sensor 1 detects as constant pressure pump 1, i.e. test pressure, flowmeter 2 detect
Flow of the flow as constant pressure pump 1, revolving speed of the revolving speed that rotational speed and torque instrument 4 detects as constant pressure pump 1.
Controller judges that constant pressure pump 1 is in constant current or constant pressure operating condition according to the flow value of flowmeter 2, and flowmeter 2 detects
Flow value it is constant be constant current operating condition, as constant pressure operating condition when flow value changes.Controller selects different further according to operating condition
Circuit is loaded, when constant pressure pump 1 is in constant current operating condition, accompanying examination motor 7, the state in flow tracking (accompanies examination motor 7 always
Input flow rate are as follows: the flow of flowmeter 2 subtracts steady state value) so that examination 7 input flow rate of motor is accompanied to be slightly less than flowmeter 2 always
Flow, only fraction flow (i.e. the flow of steady state value) test pressure by proportional pressure control valve 8 by proportional pressure control valve 8 at this time
It determines, fraction flow is needed to flow through proportional pressure control valve 8 to establish pressure.When constant pressure pump 1 is in constant pressure operating condition, proportional pressure control valve
8 setting pressure is higher than test pressure, and proportional pressure control valve 8 is used as safety valve, and the flow of constant pressure pump 1, which all flows through, accompanies examination horse
Up to 7, by accompanying examination motor 7 individually to load, pressure is tested at this time and is determined by constant pressure pump 1.Accompany examination motor 7 and proportional pressure control valve 8 mutual
The identification of load and the constant current of constant pressure pump 1 and constant pressure inflection point is realized in cooperation.
Controller accompanies the flow of examination motor 7 by control to change the flow of constant pressure pump 1, and accompanies examination motor 7 by control
Increase after the first reduction of flow, to obtain pressure flow hysteresis loop of the constant pressure pump 1 in constant pressure operating condition.
Accompany examination motor 7 during flow tracking, if detecting the stream of the constant pressure pump 1 of a test point and a upper test point
It measures difference and is higher than a certain threshold value (can preset in the controller), then it is assumed that the test point is 1 constant current of constant pressure pump and constant pressure work
The inflection point of condition, and examination motor 7 is accompanied to stop flow tracking in the test point.Controller accompanies the flow of examination motor 7 when being recorded in inflection point
Signal value.
Threshold value is set asWherein QF0For constant pressure pump 1 test it is initial when constant current operating condition flow down meter 2
Reading value；α is coefficient, takes 20%-30% or so；pmaxFor the rated pressure of constant pressure pump 1；pΔFor under constant current operating condition in test
The test pressure intervals value of each test point.After on-test, under constant current operating condition, controller is sequentially increased proportional pressure control valve 8
Pressure value, according to flow tracking control to accompany examination 7 output flow signal of motor, controller every time test pressure increase when,
The flow value for the constant pressure pump 1 that detection stream meter 2 is shown, if the flow difference of the constant pressure pump 1 of a test point and a upper test point
Higher than a certain threshold value QΔThen think that the point is the inflection point of constant pressure pump 1.After detecting inflection point, controller records current inflection point flow
Value, and the pressure of Set scale overflow valve 8, much higher than test pressure, proportional pressure control valve 8 is used as safety valve.In constant pressure operating condition
Under, first setting accompanies the flow of examination motor 7 to be successively reduced to zero, then successively rises to the inflection point flow value for accompanying examination motor 7.
The course of work of the invention:
1), initial pressure set value, the threshold value of the initial flow, proportional pressure control valve 8 of accompanying examination motor 7 are set in the controller
And steady state value, the pressure of constant pressure operating condition is set in constant pressure pump 1, opens driving element 6, driving element 6 drives transmission shaft 1
Rotation, driving constant pressure pump 1 work, and transmission shaft 1 can drive transmission shaft 2 92 to rotate by transmission belt 5 at this time；Rotational speed and torque instrument
The velocity of rotation of 4 detection transmission shafts 1, converts electric signal transmission to controller for the physical quantity measured；
2) after, constant pressure pump 1 works, the oil liquid in fuel tank 10 is extracted out by inlet port 11, oil liquid passes through pressure sensor
2 32 flow into constant pressure pump 1, and oil liquid flows out successively after pressure sensor 1 and flowmeter 2 from the outlet of constant pressure pump 1 later
It is divided into two-way；The measurement of pressure sensor 2 32 flows into the pressure of the oil liquid of constant pressure pump 1 from inlet port 11, as test pressure, pressure
The pressure for the oil liquid that the measurement of force snesor 1 is flowed out from the outlet of constant pressure pump 1；The measurement of flowmeter 2 is flowed out from the outlet of constant pressure pump 1
The flow of oil liquid, the flow as constant pressure pump 1；The object that pressure sensor 1, pressure sensor 2 32 and flowmeter 2 will measure
Reason amount is converted into electric signal transmission to controller；
3), oil liquid is divided into two-way, wherein accompanying examination motor 7 that will flow through through accompanying examination motor 7 on transmission shaft 2 92 all the way and accompanying examination
The hydraulic energy of the oil liquid of motor 7 recycles, and is converted to mechanical energy and drives the rotation of transmission shaft 2 92 (2 92 rotation direction of transmission shaft and biography
Moving axis 1 is identical)；Transmission shaft 2 92 drives transmission shaft 1 to rotate by transmission belt 5, adjusts the output work of driving element 6
Rate, dump power needed for driving element 6 inputs 1 constant rotation of constant pressure pump to transmission shaft 5 obtain subject constant pressure pump 1 enough
Input power；Oil liquid another way flows through proportional pressure control valve 8；Later from proportional pressure control valve 8 and from accompany examination motor 7 outlet flow out
Oil liquid accumulate all the way, flow back to fuel tank 10 from oil return opening 12；
4), starting detection during oil liquid flows, from experiment starting detection at the very start: to test pressure from initial
Pressure 0 to 1 constant pressure operating condition of constant pressure pump pressure (pressure of 1 constant pressure operating condition of constant pressure pump by constant pressure pump 1 itself setting determines, by perseverance
Some screw tightness of press pump 1 determines, can self-setting), it is divided into n etc. points as test point；Test is controlled by controller
Pressure (controller output phase answers electric current to proportional pressure control valve 8, changes the pressure of proportional pressure control valve 8, to control test pressure),
Begin to ramp up test pressure from initial pressure；Constant pressure pump 1 is constant current operating condition, the part oil of the outlet outflow of constant pressure pump 1 at this time
Liquid stream, which is crossed, accompanies examination motor 7, and another part oil liquid flows through proportional pressure control valve 8；Controller control accompanies examination motor 7 to start flow tracking control
System makes the flow of the oil liquid of the outlet outflow for the input flow rate constant pressure pump 1 for accompanying examination motor 7 subtract steady state value, and ratio is overflow at this time
The input flow rate for flowing valve 8 is steady state value；Controller is carried out by flow of the flowmeter 2 to the constant pressure pump 1 of each test point later
Monitoring, if the flow difference of the constant pressure pump 1 of a test point and a upper test point is higher than threshold value, controller makees the test point
For inflection point, examination motor 7 is accompanied no longer to receive flow tracking control, and constant pressure pump 1 terminates constant current operating condition；Controller records inflection point
When accompany examination motor 7 flow (as inflection point flow) and flowmeter 2 flow value；
5, constant pressure pump 1 enters constant pressure operating condition later, and test pressure continues to rise, the pressure of controller Set scale overflow valve 8
For power much higher than test pressure, whole oil liquid of the outlet outflow of constant pressure pump 1, which flow through, accompanies examination motor 7, without flow through proportional pressure control valve 8,
Examination motor 7 is accompanied to absorb whole flows from constant pressure pump 1, the flow of constant pressure pump 1 is the flow for accompanying examination motor 7 at this time；Control
Device reduces the input flow rate for accompanying examination motor 7, so that the flow from constant pressure pump 1 is reduced, until accompanying the flow of examination motor 7 until 0,
The flow of constant pressure pump 1 is also reduced to zero at this time, and tests the pressure that pressure reaches 1 constant pressure operating condition of constant pressure pump；
6), pass through when test pressure reaches the rated pressure of constant pressure pump 1 after the flow of constant pressure pump 1 reaches minimum flow 0
Controller rises the input flow rate for accompanying examination motor 7, to rise the flow of constant pressure pump 1, tests pressure at this time with the stream of constant pressure pump 1
The rising of amount and decline；To accompany the minimum flow 0 of examination motor 7 to the inflection point flow for accompanying examination motor 7, it is divided into several equal parts as stream
Measure operating point；When testing pressure decline, the flow of constant pressure pump 1 rises；In each flow operating point, controller control test pressure
Power stops some time, records after the data stabilization of pressure sensor 1, pressure sensor 2 32 and flowmeter 2 display；
7), when accompanying the flow of examination motor 7 to rise to inflection point flow, (the two is simultaneously when test pressure drops to minimum pressure 0
Reach), test process terminates；Record pressure sensor 1, the pressure of pressure sensor 2 32 and the stream of flowmeter 2 measured
Magnitude；Driving element 6 is closed, examination 7 flow of motor will be accompanied to be adjusted to zero by controller, constant pressure pump 1 tapers off work.
In entire test process, pressure is tested since minimum pressure, is successively risen, is continued to rise after inflection point, arrive
Up to the pressure of subject 1 constant pressure operating condition of constant pressure pump；The flow of constant pressure pump 1 is since constant current flow simultaneously, and when beginning is constant, by turning
After point, minimum flow 0 first is reduced to the reduction for accompanying examination 7 flow of motor.Pressure is tested later from 1 constant pressure operating condition of constant pressure pump
Pressure successively decline, reach minimum pressure；The flow of constant pressure pump 1 successively rises from minimum flow 0 simultaneously, reaches inflection point stream
Amount.
Finally, it should be noted that the above various embodiments is only used to illustrate the technical scheme of the present invention, rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, each example scheme of invention that it does not separate the essence of the corresponding technical solution
Range.
Claims (3)
1. utilizing the test method for the constant pressure pump that constant pressure pump test platform carries out, it is characterised in that:
Constant pressure pump test platform be used to detect constant pressure pump (1), and the constant pressure pump test platform includes synchronous belt (5), driving member
Part (6), load circuit, transmission shaft one (91), transmission shaft two (92) and fuel tank (10)；
The load circuit includes accompanying examination motor (7) and proportional pressure control valve (8)；The driving element (6) and constant pressure pump (1) setting
On transmission shaft one (91)；It is described that examination motor (7) is accompanied to be arranged on transmission shaft two (92)；The transmission shaft one (91) passes through synchronization
Band (5) is connect with transmission shaft two (92)；
Inlet port (11) and oil return opening (12) are provided on the fuel tank (10)；The inlet port (11) passes through pipeline and constant pressure pump
(1) it is divided into two-way after connecting, connects the import of proportional pressure control valve (8) all the way, the import of examination motor (7) is accompanied in another way connection；Institute
The outlet for stating proportional pressure control valve (8) is connect with oil return opening (12) after connecting again with the outlet of examination motor (7) is accompanied；
The constant pressure pump test platform further includes measuring cell, and the measuring cell includes pressure sensor one (31), pressure biography
Sensor two (32), flowmeter (2) and rotational speed and torque instrument (4)；The rotational speed and torque instrument (4) is arranged on transmission shaft one (91)；Institute
It states on the pipeline that pressure sensor two (32) is arranged between inlet port (11) and constant pressure pump (1)；The outlet of the constant pressure pump (1)
It is divided into two-way after being sequentially connected by pipeline and pressure sensor one (31) and flowmeter (2)；
Test method the following steps are included:
1), initial pressure set value, the threshold value of the initial flow, proportional pressure control valve (8) of accompanying examination motor (7) are set in the controller
And steady state value, the pressure of setting constant pressure operating condition, is opened driving element (6) in constant pressure pump (1), and driving element (6) drives transmission
Axis one (91) rotation, driving constant pressure pump (1) work；Rotational speed and torque instrument (4) detects the velocity of rotation of transmission shaft one (91), will measure
Physical quantity be converted into electric signal transmission to controller；
2), after constant pressure pump (1) work, the oil liquid in fuel tank (10) is extracted out by inlet port (11), oil liquid passes through pressure sensing
Device two (32) flows into constant pressure pump (1) afterwards, and oil liquid is flowed out from the outlet of constant pressure pump (1) later, by pressure sensor one (31) and
Flowmeter is divided into two-way after (2)；Pressure sensor two (32) measurement flows into the pressure of the oil liquid of constant pressure pump (1) from inlet port (11)
Power, as test pressure, the pressure for the oil liquid that pressure sensor one (31) measurement is flowed out from constant pressure pump (1) outlet；Flowmeter (2)
The flow for the oil liquid that measurement is flowed out from constant pressure pump (1) outlet, the flow as constant pressure pump (1)；Pressure sensor one (31), pressure
Sensor two (32) and flowmeter (2) convert electric signal transmission to controller for the physical quantity measured；
3), oil liquid is divided into two-way, wherein accompanying examination motor (7) to drive transmission through accompanying examination motor (7) on transmission shaft two (92) all the way
Axis two (92) rotation, transmission shaft two (92) drive transmission shaft one (91) rotation by synchronous belt (5), drive constant pressure pump (1) work,
The output power of driving element (6) is adjusted, driving element (6) inputs needed for constant pressure pump (1) constant rotation to transmission shaft one (91)
Dump power, so that constant pressure pump (1) is obtained enough input powers, oil liquid another way flows through proportional pressure control valve (8)；Later from than
Example overflow valve (8) and from accompany examination motor (7) outlet outflow oil liquid accumulate all the way, flow back to fuel tank from oil return opening (12)
(10)；
4), starting detection during oil liquid flows, to test pressure from initial pressure 0 to constant pressure pump (1) constant pressure operating condition
Pressure is divided into n etc. points as test point；Test pressure is controlled by proportional pressure control valve (8) by controller at this time, presses test
Power is begun to ramp up from initial pressure 0；Constant pressure pump (1) is constant current operating condition, the part oil liquid stream of the outlet outflow of constant pressure pump (1) at this time
It crosses and accompanies examination motor (7), another part oil liquid flows through proportional pressure control valve (8)；Examination motor (7) starting flow tracking is accompanied in controller control
Control makes the flow for the input flow rate constant pressure pump (1) for accompanying examination motor (7) subtract steady state value, and proportional pressure control valve (8) is defeated at this time
Inbound traffics are steady state value；Controller is monitored by flow of the flowmeter (2) to the constant pressure pump (1) of each test point later,
If the flow difference of the constant pressure pump (1) of test point and a upper test point is higher than threshold value, controller using the test point as
Inflection point accompanies examination motor (7) no longer to receive flow tracking control, and constant pressure pump (1) terminates constant current operating condition；Controller, which is recorded, to turn
Our controller be conveyed to accompany examination motor (7) flow as accompany examination motor (7) inflection point flow and controller record inflection point when
The flow value of flowmeter (2)；
5), constant pressure pump (1) enters constant pressure operating condition later, and whole oil liquid of the outlet outflow of constant pressure pump (1), which flow through, accompanies examination motor
(7), without flow through proportional pressure control valve (8), examination motor (7) is accompanied to absorb the whole flows for coming from constant pressure pump (1), at this time constant pressure pump (1)
Flow be accompany examination motor (7) flow；The flow for accompanying examination motor (7) is reduced by controller, to reduce constant pressure pump (1)
Flow, at this time test pressure rise with the reduction of the flow of constant pressure pump (1)；Until accompanying the flow for trying motor (7) to be to 0
Only, the flow of constant pressure pump (1) is also reduced to zero, and tests the pressure that pressure reaches constant pressure pump (1) constant pressure operating condition；
6), when test pressure reaches the pressure of constant pressure pump (1) constant pressure operating condition, after the flow of constant pressure pump (1) reaches minimum flow 0,
Rise the flow for accompanying examination motor (7) by controller, to rise the flow of constant pressure pump (1), tests pressure at this time with constant pressure pump
(1) rising of flow and decline；To accompany the minimum flow 0 of examination motor (7) to the inflection point flow for accompanying examination motor (7), if being divided into
Equal part is done as flow operating point；In each flow operating point, controller control test pressure stops some time, passes to pressure
It is recorded after the data stabilization of sensor one (31), pressure sensor two (32) and flowmeter (2) display；
7) it, when accompanying the flow of examination motor (7) to rise to inflection point flow, while testing pressure and drop to minimum pressure 0, tested
Journey terminates；Record the pressure value of pressure sensor one (31), the pressure value of pressure sensor two (32) and the flowmeter (2) measured
Flow value；It closes driving element (6), the flow of examination motor (7) will be accompanied to be adjusted to zero by controller, constant pressure pump (1) is gradually
It stops working.
2. test method according to claim 1, it is characterised in that: the constant pressure pump test platform further includes controller,
Examination motor (7), proportional pressure control valve (8), pressure sensor one (31), pressure sensor are accompanied in the controller and driving element (6)
Two (32), flowmeter (2) and rotational speed and torque instrument (4) electrical connection.
3. test method according to claim 2, it is characterised in that: the driving element (6) is variable-frequency motor.
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| CN201711480143.7A CN108266362B (en) | 2017-12-29 | 2017-12-29 | Constant pressure pump test platform and test method |
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| CN201711480143.7A CN108266362B (en) | 2017-12-29 | 2017-12-29 | Constant pressure pump test platform and test method |
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| CN108266362B true CN108266362B (en) | 2019-09-03 |
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| DE102011118282A1 (en) * | 2011-11-11 | 2013-05-16 | Robert Bosch Gmbh | Hydraulic pump test stand for hydraulic pump, has electronic feedback controller, which adjusts angle of hydraulic motor as control variable considering circuit temperature of hydraulic fluid |
| CN203430759U (en) * | 2013-08-08 | 2014-02-12 | 宁波恒力液压股份有限公司 | Hydraulic pump durability test system based on power recovery and inverter technologies |
| DE102014104708B3 (en) * | 2014-04-02 | 2015-05-21 | Agilent Technologies, Inc. - A Delaware Corporation - | DETERMINATION OF A FLUID LOSS OF A PISTON PUMP BASED ON DRAINING TIME VARIATION |
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