CN114321097B - Method for determining valve core and valve sleeve life prediction model for servo valve - Google Patents
Method for determining valve core and valve sleeve life prediction model for servo valve Download PDFInfo
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Abstract
The invention provides a method for determining a valve core and valve sleeve life prediction model for a servo valve, which comprises the following steps: s1, determining that the main failure mode of a valve core and a valve sleeve for a servo valve is erosive wear; s2, establishing an erosion abrasion fault physical model of a valve core and a valve sleeve for the servo valve; s3, obtaining the abrasion loss of the valve sleeve of the servo valve core serving as a failure criterion; s4, performing a service life test of a valve core and a valve sleeve for the servo valve; s5, carrying out life test on a plurality of valve core and valve sleeve samples for the servo valve to be tested; s6, test data of the valve core and the valve sleeve under different test conditions are obtained; s7, obtaining a valve core and valve sleeve life prediction model for the servo. The invention provides a valve core and valve sleeve life prediction model for a servo valve, wherein the abrasion loss of the valve core and valve sleeve is used as a failure criterion, and the valve core and valve sleeve life prediction model for the servo valve is determined according to the abrasion loss of the valve core and valve sleeve for the servo valve under different test conditions through a valve core and valve sleeve life test for the servo valve.
Description
Technical Field
The invention relates to the field of reliability and life prediction of electromechanical products, in particular to a method for determining a valve core and valve sleeve life prediction model for a servo valve.
Background
As a core element of an electrohydraulic servo/proportional control system, a valve core and a valve sleeve for a servo valve are increasingly widely used in the technical field of engineering. In order to further improve the working performance of the valve core and valve sleeve for the servo valve and reduce the dependence on foreign valve core and valve sleeve products for the servo valve, key factors influencing the working performance and service life of the valve core and valve sleeve for the servo valve must be studied in depth.
The spool valve housing for the servo valve typically employs a spool valve assembly as its power stage to provide hydraulic amplification in the hydraulic system. After the slide valve works for a period of time, the valve sleeve and the valve core are worn to different degrees, the expression forms are that the radial clearance of the valve sleeve valve core is increased, the throttling edge is deformed, and the like, and the failure forms can have great influence on the flow field characteristics inside the valve body, so that the flow area and the flow speed of the valve port of the slide valve are changed to different degrees. The flow coefficient of the slide valve is also one of important parameters reflecting the flow characteristics of the valve port, and is related to the opening degree and the shape of the throttling edge, and also related to the radial clearance between the valve sleeve and the valve core. Therefore, it is important to obtain a life prediction model of the valve core and valve sleeve for the servo valve according to the degradation rule of the valve core and valve sleeve for the servo valve by performing erosion and abrasion tests on slide valves with different throttling edges.
Disclosure of Invention
The invention uses a valve core and valve sleeve degradation rule based on quantitative characterization of valve core and valve sleeve abrasion loss for a servo valve, and in order to obtain a relatively accurate valve core and valve sleeve degradation rule for the servo valve, the invention provides a method for determining a valve core and valve sleeve life prediction model for the servo valve, which comprises the following steps:
s1, determining that the failure mode of a valve core and a valve sleeve for a servo valve is erosive wear;
according to the characteristic that the servo valve changes the flow and direction of output oil through the relative movement of the valve core and the valve sleeve, the main failure mode in the process of the relative movement of the valve core and the valve sleeve is erosion and abrasion; the main influencing factors of the erosive wear are determined to be the erosion angle and erosion speed of the pollution particles, the hardness of the valve core material and the attribute of the pollution particles;
s2, establishing an erosion abrasion fault physical model of a valve core and a valve sleeve for the servo valve;
according to the material and functional characteristics of a valve core and valve sleeve product for a servo valve, for the erosive wear of the valve core and valve sleeve, the wear quantity is selected as a performance evaluation index of the valve core and valve sleeve for the servo valve, the oil pollution degree and the flow rate are selected as load profiles, and an erosive wear fault physical model of the valve core and valve sleeve for the servo valve is established as follows:
E g ＝KA s (f 0 (d 0 )v+f 1 (d 0 )v 2 )t (1)
wherein: e (E) g The valve core is eroded and worn; v is the valve inlet speed; d, d 0 The particle diameter in the oil liquid; k is a parameter; a is that s Is the erosion area of the valve core, A s ＝πd 1 l，d 1 The diameter of the valve core is l, and the length of valve erosion is l; t is time; f (f) 0 (d 0 )、f 1 (d 0 ) Respectively the particle diameter d in oil 0 Related quadratic polynomials, wherein a 0 、a 1 、a 2 、b 0 、b 1 、b 2 Is a polynomial parameter; fitting is carried out through a test to obtain a parameter a 0 、a 1 、a 2 、b 0 、b 1 、b 2 And the value of K;
s3, obtaining the abrasion loss of the valve sleeve of the servo valve core serving as a failure criterion;
s4, performing a service life test of a valve core and a valve sleeve for the servo valve;
measuring the abrasion loss of the valve core and valve sleeve for the servo valve by using a valve core and valve sleeve life test device for the servo valve;
s5, carrying out life test on a plurality of valve core and valve sleeve samples for the servo valve to be tested;
repeatedly executing the step S4, and carrying out life test on different samples under the condition of setting the oil pollution degree and the flow rate, wherein the oil pollution degree is reduced to the diameter of the maximum number of solid particles in the oil to reflect different oil pollution degrees in the life test;
the wear amount of the valve core and valve sleeve for the servo valve in corresponding time under different test conditions is obtained by changing the diameter of oil solid particles and the oil flow;
s6, obtaining test data of the valve core and the valve sleeve under different test conditions according to the abrasion loss of the valve core and the valve sleeve for the servo valve under different test conditions;
recording the abrasion loss and time of each measured valve core in the life test, comparing the abrasion loss with the abrasion loss of the valve core and the valve sleeve for the servo in the step S3, and judging that the valve sleeve for the servo has faults and the life is expired if the abrasion loss is exceeded or equal to the abrasion loss;
s7, obtaining a valve core and valve sleeve life prediction model for servo;
substituting test data set and measured in the test into the erosion wear fault physical model of the valve core and valve sleeve for the servo valve established in the step S2, and usingFitting to obtain parameter a 0 、a 1 、a 2 、b 0 、b 1 、b 2 And K, determining a valve core and valve sleeve life prediction model for the servo.
Preferably, the service life test device for the valve core and the valve sleeve for the servo valve in the step S4 has the specific structure that:
the hydraulic pump pumps oil from an oil tank to a valve core valve sleeve for the tested servo valve through a filter; the first to fourth pressure gauges are used for measuring the oil pressure flowing into and out of the valve core valve sleeve for the measured servo valve respectively, the overflow valve is used for guaranteeing the stability of the oil pressure flowing through the valve core valve sleeve for the measured servo valve, the throttle valve is used for adjusting the oil flow flowing through the valve core valve sleeve for the measured servo valve, the oil flows out of the valve core valve sleeve for the measured servo valve and then returns to the oil tank through the first stop valve, the flowmeter and the cooler in sequence, the thermometer is used for measuring the oil temperature, in addition, when the throttle valve and the first stop valve are closed and the second stop valve is opened, if the valve core valve sleeve for the measured servo valve leaks, the leaked oil flows into the measuring cup through the second stop valve.
Preferably, in step S4, the service life test steps of the valve core and valve sleeve for the servo valve specifically include:
1) Checking whether the hardness and the size of the valve core meet the requirements, measuring the weight of the valve core under the condition that the hardness and the size of the valve core meet the requirements, loading the valve core into a valve body, and carrying out a test again by using a new servo valve sample without meeting the requirements;
2) The tested servo valve is installed in a life test device, the throttle valve is completely closed, the first stop valve is closed, and the second stop valve is opened; starting a hydraulic pump, and adjusting the pressure of the overflow valve to the rated pressure of the servo valve; detecting whether the leakage quantity in the tested servo valve meets the requirement, stopping the hydraulic pump if the leakage quantity meets the requirement, and carrying out a test again by using a new servo valve sample if the leakage quantity does not meet the requirement;
3) The throttle valve is fully opened, the first stop valve is opened, the second stop valve is closed, and the valve port of the tested servo valve is fully opened; starting the hydraulic pump, and adjusting the overflow valve and the throttle valve until the flow of the flowmeter is set flow;
4) Applying a control signal, changing the direction of the servo valve once every 1 hour, balancing the abrasion of two sides of the valve core, and measuring the quality of the valve core after the valve core is disassembled for cleaning and drying every 200 hours;
5) Repeating the step 4) until the test time reaches a set time value or the abrasion loss exceeds the abrasion loss of the valve core and the valve sleeve serving as a failure criterion, and stopping the test of the sample. The set time value must exceed the conventional lifetime obtained in step S3.
Preferably, specific values of the oil pollution degree and the flow rate condition are set in the step S5:
three kinds of hydraulic oil with different pollution levels are selected, wherein each oil liquid contains the same amount of solid particles with different diameters, and the diameters are 5 mu m, 50 mu m and 100 mu m respectively;
the flow rates are respectively selected from three different flow rates of 15L/min, 21L/min and 30L/min.
Preferably, in step S7, test data set and measured in the test are substituted into the erosion wear failure physical model of the valve core and valve sleeve for the servo valve established in step S2, specifically:
the flow rate of the oil is the valve inlet speed v, and the diameter of the solid particles contained in the oil is the diameter d of the particles in the oil 0 Valve core erosion area A s From the diameter d of the valve core 1 And the length of valve erosion l, both obtained from test step 1), time t and valve core erosion wear mass E obtained from test step 4) g And substituting the flow of different oil liquids and test data of different solid particle diameters contained in the oil liquids into an erosion abrasion fault physical model of a valve core and a valve sleeve for the servo valve.
Preferably, the abrasion loss of the valve sleeve of the servo valve core, which is obtained in the step S3 and serves as a failure criterion, is specifically:
the abrasion loss of the valve core is obtained by adopting a method of weighing the valve core with poor quality before and after the valve core, wherein the valve cores are measured under the condition that the valve cores are completely dried during weighing, weighing is carried out for 3 times, and then the average value is taken as a final weighing result;
for better determination of the wear of the valve sleeve of the servo valve element for failure criteria, an average value of the wear of at least 3 valve sleeve samples of the servo valve element is selected as the final failure criteria.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the performance degradation rule of the valve core and valve sleeve, the abrasion loss of the valve core and valve sleeve is used as a failure criterion, and a failure criterion threshold value of the valve core and valve sleeve is determined through a failure criterion determination test, so that a test basis is provided for a valve core and valve sleeve life prediction model for the servo valve.
2. A valve core and valve sleeve life prediction model for a servo valve is provided.
3. And carrying out a service life test of the valve core and valve sleeve for the servo valve, and obtaining the service life of the valve core and valve sleeve under different test conditions according to the abrasion loss of the valve core and valve sleeve for the servo valve under different test conditions, thereby realizing the determination of a service life prediction model of the valve core and valve sleeve for the servo valve.
Drawings
FIG. 1 is a flow chart of a method for determining a predicted valve element and valve sleeve life model for a servo valve according to the present invention;
FIG. 2 is a schematic diagram of a valve core and valve sleeve life test device for a servo valve.
1-an oil tank; 2-hydraulic pump; 3-overflow valve;
4-a filter; 5-a servo valve to be tested; 6 (1) -a first pressure gauge;
6 (2) -a second pressure gauge; 6 (3) -a third pressure gauge; 6 (4) -a fourth pressure gauge;
7-a throttle valve; 8-thermometer; 9-a flow meter;
a 10-cooler; 11 (1) -a first shut-off valve; 11 (2) -a second shut-off valve;
12-measuring cup
Detailed Description
For a better understanding of the technical solution of the present invention, the following detailed description of the specific embodiments of the present invention refers to the accompanying drawings and examples. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
Based on the valve core and valve sleeve abrasion loss quantitative characterization servo valve core and valve sleeve degradation rule, the invention provides a method for determining a valve core and valve sleeve life prediction model for a servo valve. In a specific life test design, the life test design comprises five parts: test hardware configuration, environmental condition setting, test specific operation, test data acquisition design, data post-processing and the like.
The method for determining the valve core and valve sleeve life prediction model for the servo valve, as shown in fig. 1, specifically comprises the following steps:
step S1, determining that the main failure mode of the valve core and the valve sleeve for the servo valve is erosive wear.
According to the characteristic that the servo valve changes the flow and direction of output oil through the relative movement of the valve core and the valve sleeve, the main failure mode in the process of the relative movement of the valve core and the valve sleeve is erosion and abrasion. The main influencing factors for determining the erosion wear are the erosion angle and erosion speed of the pollution particles, the hardness of the valve core material and the attribute of the pollution particles.
And S2, establishing an erosion abrasion fault physical model of the valve core and the valve sleeve for the servo valve.
According to the characteristics of materials, functions and the like of a valve core and valve sleeve product for a servo valve, for the erosive wear of the valve core and valve sleeve, the wear quantity is selected as a performance evaluation index of the valve core and valve sleeve for the servo valve, the oil pollution degree and the flow rate are selected as load profiles, and an erosive wear fault physical model of the valve core and valve sleeve for the servo valve is established as follows:
E g ＝KA s (f 0 (d 0 )v+f 1 (d 0 )v 2 )t (1)
wherein: e (E) g The valve core is eroded and worn; v is the valve inlet speed; d, d 0 The particle diameter in the oil liquid; k is a parameter; a is that s Is the erosion area of the valve core, A s ＝πd 1 l，d 1 The diameter of the valve core is l, and the length of valve erosion is l; t is time; f (f) 0 (d 0 )、f 1 (d 0 ) Respectively the particle diameter d in oil 0 Related quadratic polynomials, wherein a 0 、a 1 、a 2 、b 0 、b 1 、b 2 Is a polynomial parameter. Fitting is carried out through a test to obtain a parameter a 0 、a 1 、a 2 、b 0 、b 1 、b 2 And the value of K.
And step S3, obtaining the abrasion loss of the valve sleeve of the servo valve core serving as a failure criterion.
The main failure cause of the valve core and the valve sleeve is erosive wear, so that the weight of the valve core and the valve sleeve can be gradually reduced due to frictional wear in the degradation process, and the wear amount of the valve core and the valve sleeve which are taken as the valve core and the valve sleeve is selected as the performance degradation index of the erosive wear of the valve core and the valve sleeve.
The valve core and valve sleeve sample piece to be tested is monitored to run under the preset working load condition, the time point when the valve core and valve sleeve for the servo starts to be inconsistent with the internal leakage requirement is the conventional service life of the valve core and valve sleeve for the servo, and the abrasion loss of the valve core and valve sleeve for the servo at the time is taken as the failure criterion.
The inner leakage requirements of the valve core and valve sleeve for servo administration at present are as follows: under rated test conditions, the internal leakage of each hydraulic system servo valve should not exceed 0.5L/min; should not exceed 1L/min during the lifetime.
The abrasion loss was measured by considering that the decrease in the weight of the valve core was caused by the erosive abrasion of the valve core by particles in the present example, and therefore the abrasion loss of the valve core was obtained by taking the method of measuring the mass difference before and after the valve core, wherein the valve cores were measured with their complete dryness. In this example, a Metler-Tolyduo electronic balance was used, with an accuracy of 0.01mg. In order to reduce accidental errors caused by measuring the valve core quality, the test is carried out by weighing 3 times and taking the average value as a final weighing result.
For better determination of the wear of the valve sleeve of the servo valve element for failure criteria, an average value of the wear of at least 3 valve sleeve samples of the servo valve element is selected as the final failure criteria.
S4, performing a service life test of the valve core and valve sleeve for the servo valve.
The service life test device of the valve core and valve sleeve for the servo valve is shown in figure 2; the hydraulic pump 2 pumps oil from the oil tank 1 to the tested servo valve 5 through the filter 4; the first to fourth pressure gauges 6 (1) -6 (4) are used for measuring the oil pressure flowing into and out of the measured servo valve respectively, the overflow valve 3 is used for guaranteeing the stability of the oil pressure flowing through the measured servo valve 5, the throttle valve 7 is used for adjusting the oil flow flowing through the measured servo valve 5, the oil flows out of the measured servo valve 5 and then returns to the oil tank 1 through the first stop valve 11 (1), the flowmeter 9 and the cooler 10 in sequence, the thermometer 8 is used for measuring the oil temperature, in addition, when the throttle valve 7 and the first stop valve 11 (1) are closed and the second stop valve 11 (2) is opened, if the measured servo valve leaks, the leaked oil flows into the measuring cup 12 through the second stop valve 11 (2).
The specific test steps are as follows:
1) And checking whether the hardness and the size of the valve core meet the requirements, measuring the weight of the valve core under the condition that the hardness and the size of the valve core meet the requirements, loading the valve core into a valve body, and carrying out a test again by using a new servo valve sample without meeting the requirements.
2) The tested servo valve is installed in a life test device, the throttle valve 7 is completely closed, the first stop valve 11 (1) is closed, and the second stop valve 11 (2) is opened; starting the hydraulic pump 2, and adjusting the pressure of the overflow valve 3 to the rated pressure of the servo valve; and detecting whether the leakage quantity in the tested servo valve meets the requirement, stopping the hydraulic pump 2 if the leakage quantity in the tested servo valve meets the requirement, and carrying out the test again by using a new servo valve sample if the leakage quantity in the tested servo valve does not meet the requirement.
3) The throttle valve 7 is fully opened, the first stop valve 11 (1) is opened, the second stop valve 11 (2) is closed, and the valve port of the tested servo valve is fully opened; the hydraulic pump 2 is started, and the relief valve 3 and the throttle valve 7 are adjusted until the flow rate of the flowmeter is the set flow rate.
4) And (3) applying a control signal, changing the direction of the servo valve every 1 hour, balancing the abrasion of two sides of the valve core, and measuring the quality of the valve core after the valve core is disassembled every 200 hours for cleaning and drying treatment. The abrasion loss is measured by detaching the valve core and valve sleeve every 200 hours, so as to further obtain the whole degradation curve of the valve core and valve sleeve for servo in the test process.
5) Repeating the step 4) until the test time reaches a set time value or the abrasion loss exceeds the abrasion loss of the valve core and the valve sleeve serving as a failure criterion, and stopping the test of the sample. The set time value must exceed the normal lifetime obtained in step S3, and is set to 2000 hours in this embodiment.
S5, carrying out life test on a plurality of valve core and valve sleeve samples for the servo valve to be tested.
And (4) repeatedly executing the step (S4) to perform life test on different samples under the condition of setting the oil pollution degree and the flow rate.
The oil pollution degree is simplified in a life test to show different oil pollution degrees according to the diameter of the maximum number of solid particles in the oil; in consideration of practical application environment, three kinds of hydraulic oil with different pollution levels are selected in the test, and each oil liquid contains solid particles with the same quantity and different diameters, wherein the diameters are 5 mu m, 50 mu m and 100 mu m respectively.
The flow rates are respectively selected from three different flow rates of 15L/min, 21L/min and 30L/min.
The wear of the valve core and valve sleeve for the servo valve in corresponding time under different test conditions is obtained by changing the diameter of oil solid particles and the oil flow.
S6, according to the abrasion loss of the valve core and the valve sleeve for the servo valve under different test conditions, test data of the valve core and the valve sleeve under different test conditions are obtained.
And (3) recording the abrasion loss and time of each measured valve core in the life test, simultaneously comparing the abrasion loss with the abrasion loss of the valve core and the valve sleeve for the servo in the step (S3), and judging that the valve sleeve for the servo has faults and the life is expired if the abrasion loss and the abrasion loss are exceeded or equal.
S7, obtaining a valve core and valve sleeve life prediction model for the servo.
Substituting test data set and measured in the test into the erosion wear fault physical model of the valve core and valve sleeve for the servo valve established in the step S2, wherein the flow rate of the oil is the valve inlet speed v, and the diameter of solid particles contained in the oil is the particle diameter d in the oil 0 Valve core erosion area A s From the diameter d of the valve core 1 And the length of valve erosion l, both obtained from test step 1), time t and valve core erosion wear mass E obtained from test step 4) g . Substituting the flow of different oil liquids and test data of different solid particle diameters contained in the oil liquids into an erosion abrasion fault physical model of a valve core and a valve sleeve for a servo valve, and obtaining a parameter a by fitting 0 、a 1 、a 2 、b 0 、b 1 、b 2 And K, obtaining a valve core and valve sleeve life prediction model for servo administration.
In this embodiment, three kinds of hydraulic oil with different pollution levels are used, each oil liquid contains solid particles with the same number and different diameters, the diameters are 5 μm, 50 μm and 100 μm, three different flows of 15L/min, 21L/min and 30L/min are respectively selected, after the three flows are arranged and combined, service life tests of valve element valve sleeves for the servo valve under 9 different conditions are performed in this embodiment, and test data are substituted into the erosion and abrasion fault physical model of the valve element valve sleeve for the servo valve, which is established in the step S2, so that the erosion and abrasion fault physical model of the valve element valve sleeve for the servo valve, which is in batches where test samples are located, is obtained. The service life of the valve core valve sleeve for the servo valve in the batch can be predicted relatively accurately according to the erosion and abrasion fault physical model of the valve core valve sleeve for the servo valve.
Finally, it should be noted that: the embodiments described above are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. A method for determining a valve core and valve sleeve life prediction model for a servo valve is characterized by comprising the following steps of: which comprises the following steps:
s1, determining that the failure mode of a valve core and a valve sleeve for a servo valve is erosive wear;
according to the characteristic that the servo valve changes the flow and direction of output oil through the relative movement of the valve core and the valve sleeve, the main failure mode in the process of the relative movement of the valve core and the valve sleeve is erosion and abrasion; the main influencing factors of the erosive wear are determined to be the erosion angle and erosion speed of the pollution particles, the hardness of the valve core material and the attribute of the pollution particles;
s2, establishing an erosion abrasion fault physical model of a valve core and a valve sleeve for the servo valve;
according to the material and functional characteristics of a valve core and valve sleeve product for a servo valve, for the erosive wear of the valve core and valve sleeve, the wear quantity is selected as a performance evaluation index of the valve core and valve sleeve for the servo valve, the oil pollution degree and the flow rate are selected as load profiles, and an erosive wear fault physical model of the valve core and valve sleeve for the servo valve is established as follows:
E g ＝KA s (f 0 (d 0 )v+f 1 (d 0 )v 2 )t (1)
wherein: e (E) g Is a valve coreErosion wear quality; v is the valve inlet speed; d, d 0 The particle diameter in the oil liquid; k is a parameter; a is that s Is the erosion area of the valve core, A s ＝πd 1 l，d 1 The diameter of the valve core is l, and the length of valve erosion is l; t is time; f (f) 0 (d 0 )、f 1 (d 0 ) Respectively the particle diameter d in oil 0 Related quadratic polynomials, wherein a 0 、a 1 、a 2 、b 0 、b 1 、b 2 Is a polynomial parameter; fitting is carried out through a test to obtain a parameter a 0 、a 1 、a 2 、b 0 、b 1 、b 2 And the value of K;
s3, obtaining the abrasion loss of the valve sleeve of the servo valve core serving as a failure criterion;
monitoring the operation of a valve core and valve sleeve sample piece to be tested under the preset working load condition, wherein the time point when the valve core and valve sleeve for the servo starts to be inconsistent with the internal leakage requirement is the conventional service life of the valve core and valve sleeve for the servo, and taking the abrasion loss of the valve core and valve sleeve for the servo at the time as a failure criterion;
s4, performing a service life test of a valve core and a valve sleeve for the servo valve;
measuring the abrasion loss of the valve core and valve sleeve for the servo valve by using a valve core and valve sleeve life test device for the servo valve;
s5, carrying out life test on a plurality of valve core and valve sleeve samples for the servo valve to be tested;
repeatedly executing the step S4, and carrying out life test on different samples under the condition of setting the oil pollution degree and the flow rate, wherein the oil pollution degree is reduced to the diameter of the maximum number of solid particles in the oil to reflect different oil pollution degrees in the life test;
the wear amount of the valve core and valve sleeve for the servo valve in corresponding time under different test conditions is obtained by changing the diameter of oil solid particles and the oil flow;
s6, obtaining test data of the valve core and the valve sleeve under different test conditions according to the abrasion loss of the valve core and the valve sleeve for the servo valve under different test conditions;
recording the abrasion loss and time of each measured valve core in the life test, comparing the abrasion loss with the abrasion loss of the valve core and the valve sleeve for the servo in the step S3, and judging that the valve sleeve for the servo has faults and the life is expired if the abrasion loss is exceeded or equal to the abrasion loss;
s7, obtaining a valve core and valve sleeve life prediction model for servo;
substituting test data set and measured in the test into the erosion wear fault physical model of the valve core and valve sleeve for the servo valve established in the step S2, and obtaining the parameter a through fitting 0 、a 1 、a 2 、b 0 、b 1 、b 2 And K, determining a valve core and valve sleeve life prediction model for the servo.
2. The method of determining a predicted valve element and valve sleeve life model for a servo valve of claim 1, wherein: the service life test device for the valve core and valve sleeve for the servo valve in the step S4 has the specific structure that:
the hydraulic pump pumps oil from an oil tank to a valve core valve sleeve for the tested servo valve through a filter; the first to fourth pressure gauges are used for measuring the oil pressure flowing into and out of the valve core valve sleeve for the measured servo valve respectively, the overflow valve is used for guaranteeing the stability of the oil pressure flowing through the valve core valve sleeve for the measured servo valve, the throttle valve is used for adjusting the oil flow flowing through the valve core valve sleeve for the measured servo valve, the oil flows out of the valve core valve sleeve for the measured servo valve and then returns to the oil tank through the first stop valve, the flowmeter and the cooler in sequence, the thermometer is used for measuring the oil temperature, in addition, when the throttle valve and the first stop valve are closed and the second stop valve is opened, if the valve core valve sleeve for the measured servo valve leaks, the leaked oil flows into the measuring cup through the second stop valve.
3. The method of determining a predicted valve element and valve sleeve life model for a servo valve of claim 2, wherein: the service life test steps of the valve core and valve sleeve for the servo valve in the step S4 specifically comprise the following steps:
1) Checking whether the hardness and the size of the valve core meet the requirements, measuring the weight of the valve core under the condition that the hardness and the size of the valve core meet the requirements, loading the valve core into a valve body, and carrying out a test again by using a new servo valve sample without meeting the requirements;
2) The tested servo valve is installed in a life test device, the throttle valve is completely closed, the first stop valve is closed, and the second stop valve is opened; starting a hydraulic pump, and adjusting the pressure of the overflow valve to the rated pressure of the servo valve; detecting whether the leakage quantity in the tested servo valve meets the requirement, stopping the hydraulic pump if the leakage quantity meets the requirement, and carrying out a test again by using a new servo valve sample if the leakage quantity does not meet the requirement;
3) The throttle valve is fully opened, the first stop valve is opened, the second stop valve is closed, and the valve port of the tested servo valve is fully opened; starting the hydraulic pump, and adjusting the overflow valve and the throttle valve until the flow of the flowmeter is set flow;
4) Applying a control signal, changing the direction of the servo valve once every 1 hour, balancing the abrasion of two sides of the valve core, and measuring the quality of the valve core after the valve core is disassembled for cleaning and drying every 200 hours;
5) Repeating the step 4) until the test time reaches a set time value or the abrasion loss exceeds the abrasion loss of the valve core and the valve sleeve serving as a failure criterion, and stopping the test of the sample; the set time value must exceed the conventional lifetime obtained in step S3.
4. The method of determining a predicted valve element and valve sleeve life model for a servo valve of claim 1, wherein: the specific values of the oil pollution degree and the flow rate conditions set in the step S5 are as follows:
three kinds of hydraulic oil with different pollution levels are selected, wherein each oil liquid contains the same amount of solid particles with different diameters, and the diameters are 5 mu m, 50 mu m and 100 mu m respectively;
the flow rates are respectively selected from three different flow rates of 15L/min, 21L/min and 30L/min.
5. A method of determining a predicted valve element and valve sleeve life model for a servo valve as claimed in claim 3, wherein: in the step S7, test data set and measured in the test are substituted into the erosion wear fault physical model of the valve core and valve sleeve for the servo valve established in the step S2, which specifically includes:
the flow rate of the oil is the valve inlet speed v, and the diameter of the solid particles contained in the oil is the diameter d of the particles in the oil 0 Valve core erosion area A s From the diameter d of the valve core 1 And the length of valve erosion l, both obtained from test step 1), time t and valve core erosion wear mass E obtained from test step 4) g And substituting the flow of different oil liquids and test data of different solid particle diameters contained in the oil liquids into an erosion abrasion fault physical model of a valve core and a valve sleeve for the servo valve.
6. The method of determining a predicted valve element and valve sleeve life model for a servo valve of claim 1, wherein: the abrasion loss of the valve sleeve of the servo valve core serving as the failure criterion obtained in the step S3 is specifically as follows:
the abrasion loss of the valve core is obtained by adopting a method of weighing the valve core with poor quality before and after the valve core, wherein the valve cores are measured under the condition that the valve cores are completely dried during weighing, weighing is carried out for 3 times, and then the average value is taken as a final weighing result;
and selecting an average value of the abrasion loss of at least more than 3 valve core and valve sleeve samples for servo as a final failure criterion.
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| JPS61233204A (en) * | 1985-04-03 | 1986-10-17 | Mitsubishi Heavy Ind Ltd | Service life predicting device of servo valve |
| JPS61231420A (en) * | 1985-04-05 | 1986-10-15 | Mitsubishi Heavy Ind Ltd | Apparatus for judging service life of servo valve |
| JP2002130202A (en) * | 2000-10-30 | 2002-05-09 | Kawasaki Steel Corp | Servo valve control method and device |
| JP4359759B2 (en) * | 2003-10-23 | 2009-11-04 | 株式会社Ｉｈｉ | Rider ring wear measuring device and wear life prediction method |
| CN103307057B (en) * | 2013-06-25 | 2015-07-15 | 北京航空航天大学 | Pollution and abrasion test system for electro-hydraulic servo valve |
| CN104374662B (en) * | 2014-12-01 | 2017-01-11 | 燕山大学 | Experimental machine for evaluating friction and wear properties in hydraulic valve core and valve body |
| CN204436952U (en) * | 2014-12-30 | 2015-07-01 | 天津福云天翼科技有限公司 | A kind of high-speed switch valve |
| GB2534201A (en) * | 2015-01-16 | 2016-07-20 | Caterpillar Inc | Determining an expected lifetime of a valve device |
| CN105653798A (en) * | 2015-12-30 | 2016-06-08 | 中国航空综合技术研究所 | Method for obtaining fillet contamination wear performance degradation of electro-hydraulic servo valve |
| CN111059321B (en) * | 2019-12-24 | 2021-11-19 | 中航工业南京伺服控制***有限公司 | Double-circuit electro-hydraulic servo valve service life test and testing device |
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