CN109185275B - Load-sensing constant-pressure variable pump test device, use method and detection method thereof - Google Patents
Load-sensing constant-pressure variable pump test device, use method and detection method thereof Download PDFInfo
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- CN109185275B CN109185275B CN201811259075.6A CN201811259075A CN109185275B CN 109185275 B CN109185275 B CN 109185275B CN 201811259075 A CN201811259075 A CN 201811259075A CN 109185275 B CN109185275 B CN 109185275B
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- 238000010438 heat treatment Methods 0.000 claims description 27
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Fluid Mechanics (AREA)
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- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a high-low temperature test device of a load-sensitive pump, a use method and a detection method thereof, wherein the load-sensitive constant-pressure variable pump test device comprises: the device comprises an oil tank, a temperature control assembly, an oil temperature control assembly, an outlet pressure adjusting assembly, a control oil circuit, a motor and a torque rotating speed sensor, wherein the oil tank provides oil for a load-sensing constant-pressure variable pump; the temperature control component is used for changing the working environment temperature of the load-sensing constant-pressure variable pump; the oil temperature control component is used for adjusting the temperature of oil liquid in the oil tank; the outlet pressure regulating component is used for controlling the pressure of the oil outlet of the load-sensing constant-pressure variable pump; the control oil way is used for applying oil pressures with different settings to the control port of the load-sensing constant-pressure variable pump; the motor is used for driving the load-sensing constant-pressure variable pump; the torque and rotation speed sensor is used for detecting the torque and rotation speed output by the motor to the load-sensing constant-pressure variable pump. The invention can realize the basic test function of the load-sensing constant-pressure variable pump.
Description
Technical Field
The invention relates to the field of load-sensitive pump testing, in particular to a high-low temperature test device for a load-sensitive pump, a use method and a detection method thereof.
Background
Compared with the traditional machine, the hydraulic machine has a series of advantages, is widely applied to engineering machinery equipment, is a product widely applied to the hydraulic field, can change the displacement by adjusting the angle of the swash plate, and has the main effects of providing corresponding displacement according to the needs of the system, and achieving the effect of saving energy on the premise of realizing normal operation of the whole system. For the load-sensitive pump, the working environment is bad, the temperature is sometimes low, and the external temperature has a certain influence on the displacement, the efficiency and the variable characteristics of the load-sensitive pump, so that the performance of the load-sensitive pump under different environmental temperatures is very necessary to be explored.
The high-low temperature experimental effect of the load sensitive pump carried out at home and abroad is not ideal, the performance detection of the pump at high temperature and low temperature cannot be met functionally, the structure is complex, the integration level is low, the precision cannot meet the requirements, the high-low temperature performance detection efficiency of the load sensitive pump is low, the data reliability is low, and a large amount of manpower and material resources are required to be spent.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention aims at: the utility model provides a load sensitive pump high-low temperature test device and application method, detection method thereof.
The aim of the invention is achieved by the following technical scheme: a load sensing constant pressure variable pump test device comprising:
the oil tank is used for providing oil to the load-sensing constant-pressure variable pump;
the temperature control assembly is used for changing the working environment temperature of the load-sensing constant-pressure variable pump;
the oil temperature control assembly is used for adjusting the temperature of oil liquid in the oil tank;
the outlet pressure adjusting component is used for controlling the pressure of the oil outlet of the load-sensing constant-pressure variable pump;
the control oil way is used for applying oil pressures with different settings to the control port of the load-sensing constant-pressure variable pump;
the motor is used for driving the load-sensing constant-pressure variable pump; and
and the torque and rotation speed sensor is used for detecting the torque and rotation speed output by the motor to the load-sensing constant-pressure variable pump.
Preferably, the temperature control assembly comprises a box body, asbestos and partition plates for separating the box body from a heating cavity, a heat insulation cavity, a test cavity, a cold insulation cavity and a refrigerating cavity, wherein the asbestos is arranged on the cavity walls of the heating cavity, the heat insulation cavity, the test cavity, the cold insulation cavity and the refrigerating cavity, an assembly port for the partition plates to be inserted is formed in the position, corresponding to each partition plate, of the box body, and the load sensing constant pressure variable pump is arranged in the test cavity.
Preferably, the oil temperature control assembly includes a heater for heating the oil in the oil tank and a refrigerator for refrigerating the oil in the oil tank.
Preferably, the refrigerator comprises a stop valve, a cooling system pump, a cooler and a one-way valve which are sequentially arranged along the oil conveying direction, wherein the stop valve is arranged at an oil inlet of the refrigerator, and the one-way valve is arranged at an oil outlet of the refrigerator and is used for preventing oil from flowing into the refrigerator from the oil outlet of the refrigerator.
Preferably, the outlet pressure adjusting assembly comprises a pilot overflow valve, an oil outlet flowmeter for detecting the oil outlet flow of the load-sensing constant-pressure variable pump and an oil outlet pressure gauge for detecting the oil outlet oil pressure of the load-sensing constant-pressure variable pump, and the pilot overflow valve is connected with the oil outlet of the load-sensing constant-pressure variable pump.
Preferably, the control oil circuit comprises a pressure control overflow valve and a control port pressure gauge for detecting the oil pressure applied by the control oil circuit to the control port of the load-sensing constant-pressure variable pump, the control oil circuit is connected with the oil outlet of the load-sensing constant-pressure variable pump through the throttle valve, the throttle valve is used for preventing the oil pressure in the control oil circuit from being influenced by the oil pressure change of the oil outlet of the load-sensing constant-pressure variable pump, and the pressure control overflow valve is arranged in the control oil circuit and is used for adjusting the oil pressure applied by the control oil circuit to the control port of the load-sensing constant-pressure variable pump.
Preferably, the two end wall surfaces of the box body corresponding to the assembly ports are provided with assembly grooves.
A method of testing a load-sensing constant voltage variable pump using any of the load-sensing constant voltage variable pump test devices described above, comprising: an empty load displacement test and/or a volumetric efficiency test and/or a total efficiency test;
idle displacement test: the pilot overflow valve of the outlet pressure regulating assembly is regulated, an oil outlet of the load-sensing constant-pressure variable pump is set to be empty, a motor is started to regulate the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, and the output flow q of the load-sensing constant-pressure variable pump at the moment is measured v2,i The torque rotation speed sensor detects the rotation speed n of the load sensing constant pressure variable pump at the moment i Calculating the idle load displacement V of the load sensing constant pressure variable displacement pump through a formula I 2,i ；
Equation one:
volumetric efficiency test: starting a motor to adjust the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to enable the pressure of an oil outlet of the load-sensing constant-pressure variable pump to reach the set pressure, and measuring the output flow q of the load-sensing constant-pressure variable pump at the moment v2,e The torque rotation speed sensor detects the rotation speed n of the load sensing constant pressure variable pump at the moment e Calculating the volumetric efficiency eta of each point of the load-sensing constant-pressure variable pump through a formula II v ：
Formula II:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the volumetric efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
total efficiency test: starting a motor to adjust the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to enable the pressure of an oil outlet of the load-sensing constant-pressure variable pump to reach the set pressure, and measuring the input oil pressure p of an oil suction port of the load-sensing constant-pressure variable pump at the moment 1,e And input flow q v1,e Output oil pressure p of output load sensing constant pressure variable pump is measured 2,e And output flow q v2,e The torque and rotation speed sensor detects the input torque T and rotation speed n of the input load sensing constant voltage variable pump, and the total efficiency eta of each point of the load sensing constant voltage variable pump is calculated through a formula III t ；
And (3) a formula III:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the total efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
variable characteristic testAnd (3) testing: starting a motor to adjust the rotating speed of a load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to gradually increase the pressure of an oil outlet of the load-sensing constant-pressure variable pump from no load to maximum pressure, and gradually recovering from the maximum pressure to a no load state, and simultaneously measuring and detecting the output oil pressure p of the load-sensing constant-pressure variable pump in the process 2,e And output flow q v2,e Drawing flow-pressure characteristic curves under different regulated oil port pressures;
starting a motor to adjust the rotating speed of a load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to gradually increase the pressure of an oil outlet of the load-sensing constant-pressure variable pump from an idle state to a maximum pressure, adjusting a control oil path to ensure that the pressure applied to a control port of the load-sensing constant-pressure variable pump by the control oil path reaches the set pressure, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump by the pilot overflow valve of the outlet pressure adjusting assembly from the maximum gradually to the idle state, gradually increasing the pressure from the idle state to the maximum pressure, and measuring the output oil pressure p in the test process 2,e And output flow q v2,e And drawing a flow-pressure characteristic curve under different pressures applied to a control port of the load-sensing constant-pressure variable pump.
Preferably, the temperature control assembly comprises a box body, asbestos and partition plates for separating the box body into a heating cavity, a hot heat preservation cavity, a test cavity, a cold heat preservation cavity and a refrigerating cavity, wherein the asbestos is arranged on the cavity walls of the heating cavity, the hot heat preservation cavity, the test cavity, the cold heat preservation cavity and the refrigerating cavity, an assembly port for inserting the partition plates is formed in the position, corresponding to each partition plate, of the box body, and the load-sensing constant-pressure variable pump is arranged in the test cavity;
when a load-sensing constant-pressure variable pump is required to perform a high-temperature test, closing the partition plates between the refrigerating cavity and the cold heat-preserving cavity and between the cold heat-preserving cavity and the test cavity, starting the temperature control assembly to enable the heating cavity to reach a set temperature, then opening the partition plates between the heating cavity and the hot heat-preserving cavity and between the hot heat-preserving cavity and the test cavity to enable the heating cavity to be communicated with the test cavity, and performing the high-temperature test after the test cavity is heated to the set temperature;
when the load-sensing constant-pressure variable pump is required to perform a low-temperature test, the partition plates between the heating cavity and the heat insulation cavity and between the heat insulation cavity and the test cavity are closed, the temperature control assembly is started to enable the refrigerating cavity to reach a set temperature, then the partition plates between the refrigerating cavity and the cold insulation cavity and between the cold insulation cavity and the test cavity are opened to enable the refrigerating cavity to be communicated with the test cavity, and the test cavity is cooled to the set temperature and then subjected to the low-temperature test.
A detection method of a load-sensing constant-pressure variable pump comprises the following steps: an empty load displacement test and/or a volumetric efficiency test and/or a total efficiency test;
idle displacement test: the test pressure is no-load, the rotating speed of the load-sensing constant-pressure variable pump is regulated to a set rotating speed, and the output flow q of the load-sensing constant-pressure variable pump when the no-load pressure of the oil outlet is measured v2,i With the rotation speed n of the load-sensing constant-pressure variable pump under no-load pressure i Calculating the idle load displacement V of the load sensing constant pressure variable displacement pump according to the formula 1 2,i ；
Equation 1:
by measuring the idle displacement V in unit time 2,i Comparing the load sensing constant-pressure variable pump with a set standard idle displacement, so as to judge whether the load sensing constant-pressure variable pump meets the requirement;
volumetric efficiency test: regulating the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, and measuring the output flow q when the load-sensing constant-pressure variable pump oil outlet is at no-load pressure v2,e With the rotation speed n of the load-sensing constant-pressure variable pump under no-load pressure e Calculating the volumetric efficiency eta of the load-sensing constant-pressure variable pump through a formula 2 v ；
Equation 2:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the volumetric efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
the obtained volumetric efficiency eta v Comparing the load sensing constant pressure variable pump with the set standard volumetric efficiency, so as to judge whether the load sensing constant pressure variable pump meets the requirement;
total efficiency test: the rotating speed of the load-sensing constant-pressure variable pump is adjusted to the test set rotating speed, the oil outlet pressure of the load-sensing constant-pressure variable pump is adjusted, and the input oil pressure p of an oil suction port of the load-sensing constant-pressure variable pump is measured 1,e And input flow q v1,e Output oil pressure p of output load sensing constant pressure variable pump is measured 2,e And output flow q v2,e The input torque T and the rotation speed n of the input load-sensing constant-pressure variable pump are measured, and the total efficiency eta of each point of the load-sensing constant-pressure variable pump is calculated through a formula 3 t ；
Equation 3:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the total efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
the total efficiency eta to be obtained t Comparing the total efficiency with a set standard, thereby judging whether the load sensing constant pressure variable pump meets the requirement;
variable characteristic test: the method comprises the steps of adjusting the rotating speed of a load-sensing constant-pressure variable pump to a test set rotating speed, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump to gradually increase from an idle state to a maximum pressure, gradually recovering from the maximum pressure to the idle state, and detecting the output oil pressure p of the load-sensing constant-pressure variable pump in the test process 2,e And output flow q v2,e Drawing flow-pressure characteristic curves under different regulated oil port pressures;
the rotating speed of the load-sensing constant-pressure variable pump is regulated to the test set rotating speed, the oil outlet pressure of the load-sensing constant-pressure variable pump is regulated to gradually increase to the maximum pressure from an idle state, and the load-sensing constant-pressure variable pump is regulated to be applied to a control port of the load-sensing constant-pressure variable pumpAfter the pressure of the oil outlet of the load-sensing constant-pressure variable pump reaches the set pressure, regulating the oil outlet pressure of the load-sensing constant-pressure variable pump to gradually decrease from the maximum to the idle state, gradually increasing from the idle state to the maximum oil outlet pressure, and measuring the output oil pressure p in the test process 2,e And output flow q v2,e Drawing a flow-pressure characteristic curve under different pressures applied to a control port of the load-sensing constant-pressure variable pump;
if the variable characteristics under different pressures applied to the control ports of the load-sensing constant-pressure variable pump and/or different rotational speeds of the load-sensing constant-pressure variable pump are required to be measured, repeating the variable characteristic test after correspondingly changing the pressures applied to the control ports of the load-sensing constant-pressure variable pump and/or the rotational speeds of the load-sensing constant-pressure variable pump;
and comparing the drawn flow-pressure characteristic curve with a set standard flow-pressure characteristic curve, thereby judging whether the load-sensing constant-pressure variable pump meets the requirements.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention has the advantages of simple structure, high integration level and accurate test, can realize the basic test function of the load-sensing constant-pressure variable pump, and can accurately control the temperature of oil liquid in the test and change the working environment of the load-sensing constant-pressure variable pump.
2. The invention adopts the torque rotation speed sensor, the oil suction port pressure gauge, the oil suction port flow meter, the oil outlet pressure gauge, the oil outlet flow meter, the control port pressure gauge and the like, can efficiently acquire the measured signals in real time, has high sensitivity and accurate data.
3. The invention can accurately explore the working performances of the load-sensing constant-pressure variable pump, including no-load displacement, volumetric efficiency, total efficiency and variable characteristics.
4. The invention has a temperature control component, can change the working environment temperature of the load-sensing constant-pressure variable pump in real time, and explores the performance change of the load-sensing constant-pressure variable pump in high and low temperature environments.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a temperature control assembly of the present invention;
fig. 3 is a schematic structural view of the oil temperature control assembly of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
A load sensing constant pressure variable pump test device comprising: the device comprises an oil tank 1, a temperature control assembly, an oil temperature control assembly, an outlet pressure adjusting assembly, a control oil circuit 4, a motor 5 and a torque rotation speed sensor 6;
the oil tank 1 supplies oil to the load-sensing constant-pressure variable pump 3;
the temperature control component is used for changing the working environment temperature of the load-sensing constant-pressure variable pump 3;
the oil temperature control component is used for adjusting the temperature of the oil in the oil tank 1;
the outlet pressure regulating component is used for controlling the pressure of the oil outlet of the load-sensing constant-pressure variable pump 3;
the control oil way 4 is used for applying oil pressures with different settings to the control port of the load-sensing constant-pressure variable pump 3;
the motor 5 is used for driving the load-sensing constant-pressure variable pump 3;
the torque rotation speed sensor 6 is used for detecting the torque and rotation speed output by the motor 5 to the load-sensing constant-pressure variable pump 3.
The device also comprises an oil suction port pressure gauge 7 and an oil suction port flowmeter 8;
the oil suction port pressure gauge 7 is used for detecting the input oil pressure at the oil suction port of the load-sensing constant pressure variable pump 3 (namely, the pressure at the oil suction port of the load-sensing constant pressure variable pump 3);
the oil suction port flow meter 8 is used for detecting an input flow rate at the oil suction port of the load-sensing constant pressure variable pump 3 (i.e., a flow rate at the oil suction port of the load-sensing constant pressure variable pump 3).
An air filter 27, a liquid level relay 28, a thermometer 29 and a tank stop valve 30 can be further arranged in the oil tank 1, the air filter 27 is arranged at an inlet of the oil tank and used for filtering air entering the oil tank, the liquid level relay 28 is arranged inside the oil tank and used for measuring the oil liquid quantity inside the oil tank, such as alarm is given out when insufficient control of the oil liquid quantity is carried out, a pause test is carried out, the thermometer 29 is arranged inside the oil tank and used for measuring the oil liquid temperature in real time, and the tank stop valve 30 is arranged at the bottom of the oil tank and used for replacing the oil liquid.
The oil outlet of the load sensing constant pressure variable pump 3 is provided with a high pressure filter 31 and an overload protection overflow valve 32, and the oil return port of the outlet pressure regulating assembly is provided with an oil return filter 33.
Preferably, the temperature control assembly comprises a box 11, asbestos and partition plates 17 for separating the box 11 into a heating cavity 12, a heat insulation cavity 13, a test cavity 14, a cold insulation cavity 15 and a refrigerating cavity 16, wherein the asbestos is paved on the cavity walls of the heating cavity 12, the heat insulation cavity 13, the test cavity 14, the cold insulation cavity 15 and the refrigerating cavity 16, an assembly opening for inserting the partition plates 17 is formed in the box 11 corresponding to the installation position of each partition plate 17, and the load sensing constant pressure variable pump 3 is arranged in the test cavity 14.
The assembly groove has been seted up to the both sides that box 11 corresponds every baffle 17, and the baffle inserts the back from the assembly mouth, and the both sides of baffle are assembled respectively in the assembly groove and are followed assembly groove length direction and slide until the baffle bottom contacts with the box diapire face, and a kerve also can be seted up to the box diapire face, and the kerve can supply the baffle to insert, and the benefit that sets up like this lies in can playing better isolation effect.
Preferably, the oil temperature control assembly includes a heater 18 for heating the oil in the oil tank 1 and a refrigerator for refrigerating the oil in the oil tank 1.
Preferably, the refrigerator comprises a stop valve 19, a cooling system pump 20, a cooler 21 and a one-way valve 22 which are sequentially arranged along the oil conveying direction, wherein the stop valve 19 is arranged at an oil inlet of the refrigerator, and the one-way valve 22 is arranged at an oil outlet of the refrigerator and is used for preventing oil from flowing into the refrigerator from the oil outlet of the refrigerator.
Preferably, the outlet pressure regulating assembly comprises a pilot overflow valve 23, an oil outlet flowmeter 10 for detecting the oil outlet flow of the load-sensing constant pressure variable pump 3 and an oil outlet pressure gauge 9 for detecting the oil outlet pressure of the load-sensing constant pressure variable pump 3, wherein the pilot overflow valve 23 is connected with the oil outlet of the load-sensing constant pressure variable pump 3. The oil outlet pressure gauge 9 is used for detecting the pressure at the oil outlet of the load-sensing constant-pressure variable pump 3; the oil outlet flowmeter 10 is used for detecting the flow rate at the oil outlet of the load-sensing constant-pressure variable pump 3.
Preferably, the control oil way 4 further comprises a throttle valve 24, the control oil way 4 comprises a pressure control overflow valve 25 and a control port pressure gauge 26 for detecting the oil pressure applied by the control oil way 4 to the control port of the load-sensing constant pressure variable pump 3, the control oil way 4 is connected with the oil outlet of the load-sensing constant pressure variable pump 3 through the throttle valve 24, the throttle valve 24 can enable the oil at the oil outlet of the load-sensing constant pressure variable pump 3 to flow into the control oil way 4, the oil pressure in the control oil way 4 is not influenced by the oil pressure change at the oil outlet of the load-sensing constant pressure variable pump 3, and the pressure control overflow valve 25 is arranged in the control oil way 4 and is used for adjusting the oil pressure applied by the control oil way 4 to the control port of the load-sensing constant pressure variable pump 3.
A method of testing a load-sensing constant voltage variable pump using any of the load-sensing constant voltage variable pump test devices described above, comprising: an empty load displacement test and/or a volumetric efficiency test and/or a total efficiency test;
idle displacement test: the pilot overflow valve of the outlet pressure regulating assembly is regulated, the pressure of an oil outlet of the load-sensing constant-pressure variable pump is set to be idle, a motor is started to regulate the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, and the output flow q of the load-sensing constant-pressure variable pump at the moment is measured v2,i The torque rotation speed sensor detects the rotation speed n of the load sensing constant pressure variable pump at the moment i Calculating the idle load displacement V of the load sensing constant pressure variable displacement pump through a formula I 2,i ；
Equation one:
by measuring the idle displacement V in unit time 2,i Comparing the load sensing constant-pressure variable pump with a set standard idle displacement, so as to judge whether the load sensing constant-pressure variable pump meets the requirement;
volumetric efficiency test: starting the motor to adjust the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, and adjusting the outlet pressureLeading overflow valve of the joint assembly to make the pressure of the oil outlet of the load sensing constant pressure variable pump reach the set pressure, and measuring the output flow q of the load sensing constant pressure variable pump at the moment v2,e The torque rotation speed sensor detects the rotation speed n of the load sensing constant pressure variable pump at the moment e Calculating the volumetric efficiency eta of each point of the load-sensing constant-pressure variable pump through a formula II v ：
Formula II:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the volumetric efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
total efficiency test: starting a motor to adjust the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to enable the pressure of an oil outlet of the load-sensing constant-pressure variable pump to reach the set pressure, and measuring the input oil pressure p of an oil suction port of the load-sensing constant-pressure variable pump at the moment 1,e And input flow q v1,e Output oil pressure p of output load sensing constant pressure variable pump is measured 2,e And output flow q v2,e The torque and rotation speed sensor detects the input torque T and rotation speed n of the input load sensing constant voltage variable pump, and the total efficiency eta of each point of the load sensing constant voltage variable pump is calculated through a formula III t ；
And (3) a formula III:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the total efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
variable characteristic test: starting the motor to adjust the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, and adjusting the outlet pressureThe pilot overflow valve of the regulating assembly makes the pressure of the oil outlet of the load sensing constant pressure variable pump gradually increase from no load to maximum pressure, and then gradually recover from maximum pressure to no load state, and in the process, the output oil pressure p of the load sensing constant pressure variable pump is measured and detected simultaneously 2,e And output flow q v2,e Drawing flow-pressure characteristic curves under different regulated oil port pressures;
starting a motor to adjust the rotating speed of a load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to gradually increase the pressure of an oil outlet of the load-sensing constant-pressure variable pump from an idle state to a maximum pressure, adjusting a control oil path to ensure that the pressure applied to a control port of the load-sensing constant-pressure variable pump by the control oil path reaches the set pressure, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump by the pilot overflow valve of the outlet pressure adjusting assembly from the maximum gradually to the idle state, gradually increasing the pressure from the idle state to the maximum pressure, and measuring the output oil pressure p in the test process 2,e And output flow q v2,e And drawing a flow-pressure characteristic curve under different pressures applied to a control port of the load-sensing constant-pressure variable pump.
Preferably, the temperature control assembly comprises a box body, asbestos and partition plates for separating the box body into a heating cavity, a hot heat preservation cavity, a test cavity, a cold heat preservation cavity and a refrigerating cavity, wherein the asbestos is arranged on the cavity walls of the heating cavity, the hot heat preservation cavity, the test cavity, the cold heat preservation cavity and the refrigerating cavity, an assembly port for inserting the partition plates is formed in the position, corresponding to each partition plate, of the box body, and the load-sensing constant-pressure variable pump is arranged in the test cavity;
when a load-sensing constant-pressure variable pump is required to perform a high-temperature test, closing the partition plates between the refrigerating cavity and the cold heat-preserving cavity and between the cold heat-preserving cavity and the test cavity, starting the temperature control assembly to enable the heating cavity to reach a set temperature, then opening the partition plates between the heating cavity and the hot heat-preserving cavity and between the hot heat-preserving cavity and the test cavity to enable the heating cavity to be communicated with the test cavity, and performing the high-temperature test after the test cavity is heated to the set temperature;
when the load-sensing constant-pressure variable pump is required to perform a low-temperature test, the partition plates between the heating cavity and the heat insulation cavity and between the heat insulation cavity and the test cavity are closed, the temperature control assembly is started to enable the refrigerating cavity to reach a set temperature, then the partition plates between the refrigerating cavity and the cold insulation cavity and between the cold insulation cavity and the test cavity are opened to enable the refrigerating cavity to be communicated with the test cavity, and the test cavity is cooled to the set temperature and then subjected to the low-temperature test.
A detection method of a load-sensing constant-pressure variable pump comprises the following steps: an empty load displacement test and/or a volumetric efficiency test and/or a total efficiency test;
idle displacement test: the test pressure is no-load, the rotating speed of the load-sensing constant-pressure variable pump is regulated to a set rotating speed, and the output flow q of the load-sensing constant-pressure variable pump when the no-load pressure of the oil outlet is measured v2,i With the rotation speed n of the load-sensing constant-pressure variable pump under no-load pressure i Calculating the idle load displacement V of the load sensing constant pressure variable displacement pump according to the formula 1 2,i ；
Equation 1:
volumetric efficiency test: regulating the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, and measuring the output flow q when the load-sensing constant-pressure variable pump oil outlet is at no-load pressure v2,e With the rotation speed n of the load-sensing constant-pressure variable pump under no-load pressure e Calculating the volumetric efficiency eta v of the load-sensing constant-pressure variable pump through a formula 2;
equation 2:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the volumetric efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
the obtained volumetric efficiency eta v Comparing the load sensing constant pressure variable pump with the set standard volumetric efficiency, so as to judge whether the load sensing constant pressure variable pump meets the requirement;
total efficiency test: regulating load-sensing constant voltage changesThe rotation speed of the measuring pump is up to the test set rotation speed, the oil outlet pressure of the load-sensing constant-pressure variable pump is regulated, and the input oil pressure p of the oil suction port of the load-sensing constant-pressure variable pump is measured 1,e And input flow q v1,e Output oil pressure p of output load sensing constant pressure variable pump is measured 2,e And output flow q v2,e The input torque T and the rotation speed n of the input load-sensing constant-pressure variable pump are measured, and the total efficiency eta of each point of the load-sensing constant-pressure variable pump is calculated through a formula 3 t ；
Equation 3:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the total efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
the total efficiency eta to be obtained t Comparing the total efficiency with a set standard, thereby judging whether the load sensing constant pressure variable pump meets the requirement;
variable characteristic test: the method comprises the steps of adjusting the rotating speed of a load-sensing constant-pressure variable pump to a test set rotating speed, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump to gradually increase from an idle state to a maximum pressure, gradually recovering from the maximum pressure to the idle state, and detecting the output oil pressure p of the load-sensing constant-pressure variable pump in the test process 2,e And output flow q v2,e Drawing flow-pressure characteristic curves under different regulated oil port pressures;
the method comprises the steps of adjusting the rotating speed of a load-sensing constant-pressure variable pump to a test set rotating speed, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump to gradually increase to the maximum pressure from an idle state, adjusting the pressure applied to a control port of the load-sensing constant-pressure variable pump to the set pressure, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump to gradually decrease from the maximum value to the idle state, gradually increasing to the maximum oil outlet pressure from the idle state, and measuring the output oil pressure p in the test process 2,e And output flow q v2,e Drawing control port of load-sensing constant-pressure variable pumpApplying flow-pressure characteristic curves at different pressures;
if the variable characteristics under different pressures applied to the control ports of the load-sensing constant-pressure variable pump and/or different rotational speeds of the load-sensing constant-pressure variable pump are required to be measured, repeating the variable characteristic test after correspondingly changing the pressures applied to the control ports of the load-sensing constant-pressure variable pump and/or the rotational speeds of the load-sensing constant-pressure variable pump;
and comparing the drawn flow-pressure characteristic curve with a set standard flow-pressure characteristic curve, thereby judging whether the load-sensing constant-pressure variable pump meets the requirements.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a load-sensing constant voltage variable pump test device which characterized in that includes:
the oil tank is used for providing oil to the load-sensing constant-pressure variable pump;
the temperature control assembly is used for changing the working environment temperature of the load-sensing constant-pressure variable pump;
the oil temperature control assembly is used for adjusting the temperature of oil liquid in the oil tank;
the outlet pressure adjusting component is used for controlling the pressure of the oil outlet of the load-sensing constant-pressure variable pump;
the control oil way is used for applying oil pressures with different settings to the control port of the load-sensing constant-pressure variable pump;
the motor is used for driving the load-sensing constant-pressure variable pump; and
the torque and rotation speed sensor is used for detecting the torque and rotation speed output by the motor to the load-sensing constant-pressure variable pump;
the temperature control assembly comprises a box body, asbestos and partition boards for separating the box body into a heating cavity, a heat insulation cavity, a test cavity, a cold insulation cavity and a refrigerating cavity, wherein the asbestos is arranged on the cavity walls of the heating cavity, the heat insulation cavity, the test cavity, the cold insulation cavity and the refrigerating cavity, an assembly port for the partition boards to be inserted is formed in the position, corresponding to each partition board, of the box body, and the load sensing constant pressure variable pump is arranged in the test cavity.
2. The load sensing constant pressure variable pump test device of claim 1, wherein the oil temperature control assembly comprises a heater for heating the oil in the oil tank and a refrigerator for refrigerating the oil in the oil tank.
3. The load sensing constant pressure variable pump test device according to claim 2, wherein the refrigerator comprises a stop valve, a cooling system pump, a cooler and a one-way valve which are sequentially arranged along the oil conveying direction, the stop valve is arranged at an oil inlet of the refrigerator, and the one-way valve is arranged at an oil outlet of the refrigerator and used for preventing oil from flowing into the refrigerator from the oil outlet of the refrigerator.
4. The load-sensing constant-pressure variable pump test device according to claim 1, wherein the outlet pressure regulating assembly comprises a pilot-operated overflow valve, an oil outlet flowmeter for detecting the oil outlet flow of the load-sensing constant-pressure variable pump, and an oil outlet pressure gauge for detecting the oil outlet pressure of the load-sensing constant-pressure variable pump, and the pilot-operated overflow valve is connected with the oil outlet of the load-sensing constant-pressure variable pump.
5. The load-sensing constant-pressure variable pump test device according to claim 1, further comprising a throttle valve, wherein the control oil path comprises a pressure-controlling overflow valve and a control port pressure gauge for detecting the magnitude of oil pressure applied by the control oil path to a control port of the load-sensing constant-pressure variable pump, the control oil path is connected with an oil outlet of the load-sensing constant-pressure variable pump through the throttle valve, the throttle valve is used for preventing the oil pressure in the control oil path from being influenced by the oil pressure change of an oil outlet of the load-sensing constant-pressure variable pump, and the pressure-controlling overflow valve is arranged in the control oil path and is used for adjusting the magnitude of the oil pressure applied by the control oil path to the control port of the load-sensing constant-pressure variable pump.
6. The load-sensing constant-pressure variable pump test device according to claim 1, wherein the two end wall surfaces of the box body corresponding to the assembly ports are provided with assembly grooves.
7. A method of testing a load-sensing constant voltage variable pump using the load-sensing constant voltage variable pump test device of any one of claims 1-6, comprising: an empty load displacement test and/or a volumetric efficiency test and/or a total efficiency test;
idle displacement test: the pilot overflow valve of the outlet pressure regulating assembly is regulated, an oil outlet of the load-sensing constant-pressure variable pump is set to be empty, a motor is started to regulate the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, and the output flow q of the load-sensing constant-pressure variable pump at the moment is measured v2,i The torque rotation speed sensor detects the rotation speed n of the load sensing constant pressure variable pump at the moment i Calculating the idle load displacement V of the load sensing constant pressure variable displacement pump through a formula I 2,i ；
Equation one:
volumetric efficiency test: starting a motor to adjust the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to enable the pressure of an oil outlet of the load-sensing constant-pressure variable pump to reach the set pressure, and measuring the output flow q of the load-sensing constant-pressure variable pump at the moment v2,e The torque rotation speed sensor detects the rotation speed n of the load sensing constant pressure variable pump at the moment e Calculating the volumetric efficiency eta of each point of the load-sensing constant-pressure variable pump through a formula II v ：
Formula II:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the volumetric efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
total efficiency test: starting a motor to adjust the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to enable the pressure of an oil outlet of the load-sensing constant-pressure variable pump to reach the set pressure, and measuring the input oil pressure p of an oil suction port of the load-sensing constant-pressure variable pump at the moment 1,e And input flow q v1,e Output oil pressure p of output load sensing constant pressure variable pump is measured 2,e And output flow q v2,e The torque and rotation speed sensor detects the input torque T and rotation speed n of the input load sensing constant voltage variable pump, and the total efficiency eta of each point of the load sensing constant voltage variable pump is calculated through a formula III t ；
And (3) a formula III:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the total efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
variable characteristic test: starting a motor to adjust the rotating speed of a load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to gradually increase the pressure of an oil outlet of the load-sensing constant-pressure variable pump from no load to maximum pressure, and gradually recovering from the maximum pressure to a no load state, and simultaneously measuring and detecting the output oil pressure p of the load-sensing constant-pressure variable pump in the process 2,e And output flow q v2,e Drawing flow-pressure characteristic curves under different regulated oil port pressures;
starting a motor to adjust the rotating speed of a load-sensing constant-pressure variable pump to a set rotating speed, adjusting a pilot overflow valve of an outlet pressure adjusting assembly to gradually increase the pressure of an oil outlet of the load-sensing constant-pressure variable pump from an idle state to a maximum pressure, and adjusting a control oil way to enable the control oil way to be applied to the loadAfter the pressure of the control port of the sensing constant pressure variable pump reaches the set pressure, the pilot overflow valve of the outlet pressure regulating assembly regulates the oil outlet pressure of the load sensing constant pressure variable pump to gradually decrease from the maximum to the idle state, gradually increase from the idle state to the maximum pressure, and measure the output oil pressure p in the test process 2,e And output flow q v2,e And drawing a flow-pressure characteristic curve under different pressures applied to a control port of the load-sensing constant-pressure variable pump.
8. The method of load sensing constant pressure variable pump testing of claim 7, wherein; the temperature control assembly comprises a box body, asbestos and partition plates for separating the box body into a heating cavity, a thermal insulation cavity, a test cavity, a cold insulation cavity and a refrigerating cavity, wherein the asbestos is arranged on the cavity walls of the heating cavity, the thermal insulation cavity, the test cavity, the cold insulation cavity and the refrigerating cavity, the position, corresponding to each partition plate, of the box body is provided with an assembly port for inserting the partition plates, and the load sensing constant pressure variable pump is arranged in the test cavity;
when a load-sensing constant-pressure variable pump is required to perform a high-temperature test, closing the partition plates between the refrigerating cavity and the cold heat-preserving cavity and between the cold heat-preserving cavity and the test cavity, starting the temperature control assembly to enable the heating cavity to reach a set temperature, then opening the partition plates between the heating cavity and the hot heat-preserving cavity and between the hot heat-preserving cavity and the test cavity to enable the heating cavity to be communicated with the test cavity, and performing the high-temperature test after the test cavity is heated to the set temperature;
when the load-sensing constant-pressure variable pump is required to perform a low-temperature test, the partition plates between the heating cavity and the heat insulation cavity and between the heat insulation cavity and the test cavity are closed, the temperature control assembly is started to enable the refrigerating cavity to reach a set temperature, then the partition plates between the refrigerating cavity and the cold insulation cavity and between the cold insulation cavity and the test cavity are opened to enable the refrigerating cavity to be communicated with the test cavity, and the test cavity is cooled to the set temperature and then subjected to the low-temperature test.
9. The method for detecting the load-sensing constant-pressure variable pump is characterized by comprising the following steps of: an empty load displacement test and/or a volumetric efficiency test and/or a total efficiency test;
idle displacement test: the test pressure is no-load, the rotating speed of the load-sensing constant-pressure variable pump is regulated to a set rotating speed, and the output flow q of the load-sensing constant-pressure variable pump when the no-load pressure of the oil outlet is measured v2,i With the rotation speed n of the load-sensing constant-pressure variable pump under no-load pressure i Calculating the idle load displacement V of the load sensing constant pressure variable displacement pump according to the formula 1 2,i ；
Equation 1:
by measuring the idle displacement V in unit time 2,i Comparing the load sensing constant-pressure variable pump with a set standard idle displacement, so as to judge whether the load sensing constant-pressure variable pump meets the requirement;
volumetric efficiency test: regulating the rotating speed of the load-sensing constant-pressure variable pump to a set rotating speed, and measuring the output flow q when the load-sensing constant-pressure variable pump oil outlet is at no-load pressure v2,e With the rotation speed n of the load-sensing constant-pressure variable pump under no-load pressure e Calculating the volumetric efficiency eta of the load-sensing constant-pressure variable pump through a formula 2 v ；
Equation 2:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the volumetric efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
the obtained volumetric efficiency eta v Comparing the load sensing constant pressure variable pump with the set standard volumetric efficiency, so as to judge whether the load sensing constant pressure variable pump meets the requirement;
total efficiency test: the rotating speed of the load-sensing constant-pressure variable pump is adjusted to the test set rotating speed, the oil outlet pressure of the load-sensing constant-pressure variable pump is adjusted, and the input oil pressure p of an oil suction port of the load-sensing constant-pressure variable pump is measured 1,e And input flow q v1,e Output oil pressure p of output load sensing constant pressure variable pump is measured 2,e And output flow q v2,e The input torque T and the rotation speed n of the input load-sensing constant-pressure variable pump are measured, and the total efficiency eta of each point of the load-sensing constant-pressure variable pump is calculated through a formula 3 t ；
Equation 3:
if the rotating speeds of different load-sensing constant-pressure variable pumps are required to be measured and/or the total efficiency of the load-sensing constant-pressure variable pumps under the oil outlet pressure is regulated, repeating the volumetric efficiency test after correspondingly changing the rotating speeds and/or the oil outlet pressure of the load-sensing constant-pressure variable pumps;
the total efficiency eta to be obtained t Comparing the total efficiency with a set standard, thereby judging whether the load sensing constant pressure variable pump meets the requirement;
variable characteristic test: the method comprises the steps of adjusting the rotating speed of a load-sensing constant-pressure variable pump to a test set rotating speed, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump to gradually increase from an idle state to a maximum pressure, gradually recovering from the maximum pressure to the idle state, and detecting the output oil pressure p of the load-sensing constant-pressure variable pump in the test process 2,e And output flow q v2,e Drawing flow-pressure characteristic curves under different regulated oil port pressures;
the method comprises the steps of adjusting the rotating speed of a load-sensing constant-pressure variable pump to a test set rotating speed, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump to gradually increase to the maximum pressure from an idle state, adjusting the pressure applied to a control port of the load-sensing constant-pressure variable pump to the set pressure, adjusting the oil outlet pressure of the load-sensing constant-pressure variable pump to gradually decrease from the maximum value to the idle state, gradually increasing to the maximum oil outlet pressure from the idle state, and measuring the output oil pressure p in the test process 2,e And output flow q v2,e Drawing a flow-pressure characteristic curve under different pressures applied to a control port of the load-sensing constant-pressure variable pump;
if the variable characteristics under different pressures applied to the control ports of the load-sensing constant-pressure variable pump and/or different rotational speeds of the load-sensing constant-pressure variable pump are required to be measured, repeating the variable characteristic test after correspondingly changing the pressures applied to the control ports of the load-sensing constant-pressure variable pump and/or the rotational speeds of the load-sensing constant-pressure variable pump;
and comparing the drawn flow-pressure characteristic curve with a set standard flow-pressure characteristic curve, thereby judging whether the load-sensing constant-pressure variable pump meets the requirements.
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| JPH09217705A (en) * | 1996-02-09 | 1997-08-19 | Hitachi Constr Mach Co Ltd | Hydraulic driving device by load sensing control |
| CN104481972A (en) * | 2014-12-19 | 2015-04-01 | 上海电气液压气动有限公司 | Load sensitive test system for closed hydraulic pump |
| CN106762595A (en) * | 2017-02-27 | 2017-05-31 | 江苏恒立液压科技有限公司 | Load sensitive pump pilot system |
| CN107859671A (en) * | 2017-12-11 | 2018-03-30 | 徐州工程学院 | A kind of load sensing multi-way valve experimental rig and test method |
| CN209761915U (en) * | 2018-10-26 | 2019-12-10 | 华南理工大学 | Load sensing constant-pressure variable pump test device |
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2018
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09217705A (en) * | 1996-02-09 | 1997-08-19 | Hitachi Constr Mach Co Ltd | Hydraulic driving device by load sensing control |
| CN104481972A (en) * | 2014-12-19 | 2015-04-01 | 上海电气液压气动有限公司 | Load sensitive test system for closed hydraulic pump |
| CN106762595A (en) * | 2017-02-27 | 2017-05-31 | 江苏恒立液压科技有限公司 | Load sensitive pump pilot system |
| CN107859671A (en) * | 2017-12-11 | 2018-03-30 | 徐州工程学院 | A kind of load sensing multi-way valve experimental rig and test method |
| CN209761915U (en) * | 2018-10-26 | 2019-12-10 | 华南理工大学 | Load sensing constant-pressure variable pump test device |
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