CN101451893A - Test system and test method for hydraulic cylinder with loading friction force characteristic - Google Patents
Test system and test method for hydraulic cylinder with loading friction force characteristic Download PDFInfo
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- CN101451893A CN101451893A CNA2008102374070A CN200810237407A CN101451893A CN 101451893 A CN101451893 A CN 101451893A CN A2008102374070 A CNA2008102374070 A CN A2008102374070A CN 200810237407 A CN200810237407 A CN 200810237407A CN 101451893 A CN101451893 A CN 101451893A
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Abstract
The invention relates to a measuring system and a measuring method of hydraulic cylinder characteristic. The technical solution is following: the oil outlet of the oil pump (9) is connected to the P hole of the electric liquid servo valve (13); A hole or B hole of the electric liquid servo valve (13) are connected to the non-rod cavity of the measured hydraulic cylinder (2); the rod cavity of the measured hydraulic cylinder (2) is connected to the tank (11); the measured hydraulic cylinder (2) is installed in a sealed frame (1); the measured hydraulic cylinder (2) is mounted with a displacement sensor (3); the displacement sensor (3) is electrically connected to the A/D-1 of the data collecting card (6); the A hole or B hole of the electric liquid servo valve (13) are electrically connected to the pressure sensor (4) connected to the measured hydraulic cylinder (2) and the A/D-1 of the data collecting card (6) of the pressure sensor (4); the data collecting card (6) and the computer assistant measuring software (5) are installed in the computer. The invention has the characteristics of simple structure, precise measurement and high level of automation.
Description
Technical field
The invention belongs to the Hydraulic Elements technical field of measurement and test.Be specifically related to a kind of hydraulic cylinder with loading friction force characteristic test macro and method of testing.
Background technology
Hydraulic system is because of having the significant points that power is big, response is fast, the precision advantages of higher is widely used in metallurgical production equipment.Hydraulic cylinder is the topworks of hydraulic system, its friction force size in the moving process of band carrying has very big influence to the performance of whole hydraulic system, nonlinear friction force not only will be brought dynamic dead band, and also to bring adverse influence to stability and frequency range, therefore the band loading friction force characteristic of hydraulic cylinder is accurately tested very necessity.Especially low friction servo hydraulic cylinder, rolling mill hydraulic are depressed the harsh servo hydraulic cylinders of requirement such as (AGC) servo hydraulic cylinder, excessive friction force is easy to generate limit cycles oscillations, and produce static dead band and dynamic dead band, reduce the response frequency of hydraulic cylinder, must before being installed on the production line, accurately test its friction force.
Mainly there is the problem of the following aspects in the kinetic force of friction method of testing of hydraulic cylinder at present:
1, the no respective country standard of current servo hydraulic cylinder with loading friction force test, as pressing common hydraulic cylinder (GB/T 15622-2001, the hydraulic cylinder test method), adopt two hydraulic cylinders that the mode on top is loaded, by detecting the load pressure reduction in two hydraulic cylinder two chambeies, calculate the friction force of tested hydraulic cylinder.The friction force that has comprised loading hydraulic cylinder in the test result of this method, the structure more complicated, measuring accuracy is also influenced.
2, existing research to the servo hydraulic cylinder friction testing with put into practice (Ceng Liangcai. the friction force of the automatic roll gap control of large-sized rolling mills servoBcylinder is tested automatically. hydraulic pressure and pneumatic, 2002 (1), pp26-28; Luo Fusheng, Zhao Lianli, Zhou Shichang. hydraulic pressure is depressed the sealing of servoBcylinder and the research of friction force, 1996 (5), pp15-16) in, only carried out the testing research of servo hydraulic cylinder starting friction power, and do not carried out the testing research of servo hydraulic cylinder band loading friction force.
Summary of the invention
The present invention is intended to overcome above-mentioned technological deficiency, and purpose provides the test macro and the method for testing of the hydraulic cylinder with loading friction force that a kind of system architecture is simple, test is accurate, automaticity is high.
For achieving the above object, the technical scheme that test macro of the present invention adopts is: oil pump connects with motor coaxle, the inlet port of oil pump communicates with fuel tank, the oil-out of oil pump communicates with the P mouth of electrohydraulic servo valve by filtrator, the A mouth of electrohydraulic servo valve or B mouth communicate with the rodless cavity of tested hydraulic cylinder, the B mouth of electrohydraulic servo valve or the sealing of A mouth; The T mouth of the rod chamber of tested hydraulic cylinder and electrohydraulic servo valve communicates with fuel tank; Be connected with electromagnetic relief valve between the P of electrohydraulic servo valve mouth pressuring oil pipe road and T mouth scavenge pipe, tested hydraulic cylinder is installed in the closed frame.
Between the cylinder body end face of tested hydraulic cylinder rod chamber end and closed frame displacement transducer is housed, displacement transducer is electrically connected with the A/D-1 mouth of data collecting card; On the A mouth of electrohydraulic servo valve or B mouth and the pipeline that the rodless cavity of tested hydraulic cylinder links to each other pressure transducer is housed, pressure transducer is electrically connected with the A/D-2 mouth of data collecting card; One end of servoamplifier is electrically connected with the electromagnet of electrohydraulic servo valve, and the other end of servoamplifier is electrically connected with the D/A mouth of data collecting card, and data collecting card and computer-aided test software are installed in the computing machine.
The maximum flexibility deflection of closed frame [1] is greater than the maximum displacement Δ S of oil cylinder piston between the test section
Max
The main flow of computer-aided test software is:
S1-1: parameter maximum displacement Δ S is set
Max=1～2mm, initialization test variable, control voltage u
0=0, backhaul mark flag=0;
S1-2: scan A/D-1 passage and A/D-2 passage show and record A/D-1 mouth piston initial displacement S
0With A/D-2 mouth rodless cavity original pressure P
0
S1-3: send control voltage, u by the D/A-1 passage
N+1=u
n+ Δ u;
S1-4: scan A/D-1 passage, recording and analyses displacement S
n=U
A/D, scan A/D-2 passage, record rodless cavity pressure P
n=U
A/D
S1-5: displacement calculating amount Δ S=S
n-S
0, judge that whether displacement Δ S is more than or equal to maximum displacement Δ S
Max, if not then turn back to S1-3, if then continue next step;
S1-6: judge whether backhaul mark flag is zero, if not then jump to S1-8, if then continue next step;
S1-7: the control voltage reverse Δ u=-Δ u that rises in value, backhaul mark flag=1;
S1-8: judge that whether displacement Δ S is greater than zero; If then turn back to S1-3, if not then continue next step;
S1-9: with displacement S
nBe horizontal ordinate, pressure P
nProduct P with rodless cavity area S
nS is an ordinate, draws band loading friction force characteristic curve;
S1-10: read corresponding same shift value S from curve
nP
nThe S value is calculated their difference and divided by 2, is band loading friction force f, and the maximal value of getting f is carried friction force as the maximum band.
The present invention adopts described test macro with the method for testing of loading friction force characteristic to be, maximum displacement Δ S between first test section in the first test fluid cylinder pressure stroke range
MaxThe band loading friction force characteristic the steps include:
S2-1: set up electromagnetic relief valve pressure, starter motor, hydraulic system is started working;
S2-2: start computing machine, open computer-aided test software;
S2-3: parameter maximum displacement Δ S is set in computer-aided test software
Max, begin test;
S2-4: the test result of waiting for hydraulic cylinder with loading friction force characteristic;
S2-5: hydraulic cylinder with loading friction force characteristic curve and result of calculation deposit thereof are printed;
S2-6: disable motor stops hydraulic work system;
S2-7: withdraw from computer-aided test software, shut down computer.
Maximum displacement Δ S between in the test fluid cylinder pressure stroke range second or second above test section
MaxThe step of band loading friction force characteristic is: after the tested hydraulic cylinder bottom adds cushion block, repeat maximum displacement Δ S between first test section
MaxThe testing procedure of band loading friction force characteristic.
Owing to adopt technique scheme, the present invention has the advantage that system architecture is simple, test is accurate, automaticity is high, is in particular in:
1, electrohydraulic servo valve carries out position adjustments, and pressure transducer carries out pressure detection, and displacement transducer carries out displacement detecting, computer-aided test software processes test result, and system architecture is simple.
2, export the slope control signal by the D/A passage of computer-aided test software, be converted to the current signal of power amplification through servoamplifier, drive the electromagnet of electrohydraulic servo valve, thereby accurately control the flow of electrohydraulic servo valve P mouth, can accurately measure hydraulic cylinder with loading friction force to A mouth or B mouth.
3, computer-aided test software writes down detected rodless cavity pressure signal of pressure transducer and the detected piston displacement signal of displacement transducer respectively by A/D-1 and A/D-2 passage in whole test process, and be depicted as tested hydraulic cylinder band loading friction force characteristic curve, draw the maximum band loading friction force of tested hydraulic cylinder in choosing surveyed area, the automaticity height.
The present invention is fit to the accurate test of all hydraulic cylinder band loading friction force characteristic, the accurate test that especially low friction hydraulic cylinder, rolling mill hydraulic are depressed (AGC) servo hydraulic cylinder band loading friction force characteristic.
Description of drawings
Fig. 1 is a kind of test macro synoptic diagram of the present invention;
Fig. 2 is the main flow block diagram of the testing software 5 among Fig. 1;
Fig. 3 is the overhanging fundamental diagram of piston rod when adopting Fig. 1;
Fig. 4 is the fundamental diagram that piston rod is regained when adopting Fig. 1;
Fig. 5 is the band loading friction force characteristic curve map when adopting Fig. 1.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention being further described, is not the restriction to protection domain:
A kind of test and test macro thereof that is used to measure the hydraulic cylinder friction force characteristic, this test macro is as shown in Figure 1: oil pump 9 and 10 coaxial connections of motor, the inlet port of oil pump 9 communicates with fuel tank 11, the oil-out of oil pump 9 communicates with the P mouth of electrohydraulic servo valve 13 by filtrator 8, the A mouth of electrohydraulic servo valve 13 communicates with the rodless cavity of tested hydraulic cylinder 2, the B mouth sealing of electrohydraulic servo valve 13; The T mouth of the rod chamber of tested hydraulic cylinder 2 and electrohydraulic servo valve 13 communicates with fuel tank 11; Be connected with electromagnetic relief valve 12 between the P of electrohydraulic servo valve 13 mouth pressuring oil pipe road and T mouth return line, tested hydraulic cylinder 2 is installed in the closed frame 1.
Cylinder body end face and 1 of closed frame at tested hydraulic cylinder 2 rod chamber ends are equipped with displacement transducer 3, and displacement transducer 3 is electrically connected with the A/D-1 mouth of data collecting card 6; On the A mouth of electrohydraulic servo valve 13 and the pipeline that the rodless cavity of tested hydraulic cylinder 2 links to each other pressure transducer 4 is housed, pressure transducer 4 is electrically connected with the A/D-2 mouth of data collecting card 6; One end of servoamplifier 7 is electrically connected with the electromagnet of electrohydraulic servo valve 13, and the other end of servoamplifier 7 is electrically connected with the D/A mouth of data collecting card 6, and data collecting card 6 and computer-aided test software 5 are installed in the computing machine.
The maximum flexibility deflection of closed frame [1] is greater than the maximum displacement Δ S of oil cylinder piston between the test section
Max
The main flow of computer-aided test software 5 is as shown in Figure 2:
S1-1: parameter maximum displacement Δ S is set
Max=1mm, initialization test variable, control voltage u
0=0, backhaul mark flag=0;
S1-2: scan A/D-1 passage and A/D-2 passage show and record A/D-1 mouth piston initial displacement S
0With A/D-2 mouth rodless cavity original pressure P
0
S1-3: send control voltage, u by the D/A-1 passage
N+1=u
n+ Δ u;
S1-4: scan A/D-1 passage, recording and analyses displacement S
n=U
A/D, scan A/D-2 passage, record rodless cavity pressure P
n=U
A/D
S1-5: displacement calculating amount Δ S=S
n-S
0, judge that whether displacement Δ S is more than or equal to maximum displacement Δ S
Max, if not then turn back to S1-3, if then continue next step;
S1-6: judge whether backhaul mark flag is zero, if not then jump to S1-8, if then continue next step;
S1-7: the control voltage reverse Δ u=-Δ u that rises in value, backhaul mark flag=1;
S1-8: judge that whether displacement Δ S is greater than zero; If then turn back to S1-3, if not then continue next step;
S1-9: with displacement S
nBe horizontal ordinate, pressure P
nProduct P with rodless cavity area S
nS is an ordinate, draws band loading friction force characteristic curve;
S1-10: read corresponding same shift value S from curve
nP
nThe S value is calculated their difference and divided by 2, is band loading friction force f, and the maximal value of getting f is carried friction force as the maximum band.
This embodiment adopts this test macro with the method for testing of loading friction force characteristic to be:
Maximum displacement Δ S between first test section in the test servo hydraulic cylinder stroke range
MaxThe band loading friction force characteristic the steps include:
S2-1: set up the pressure of electromagnetic relief valve 12, starter motor 10, hydraulic system is started working;
S2-2: start computing machine, open computer-aided test software 5;
S2-3: parameter maximum displacement Δ S is set in computer-aided test software 5
Max, begin test;
S2-4: wait for that servo hydraulic cylinder 2 moving bands carry the test result of friction force characteristic;
S2-5: servo hydraulic cylinder 2 band loading friction force characteristic curves and result of calculation deposit thereof are printed;
S2-6: disable motor 10 stops hydraulic work system;
S2-7: withdraw from computer-aided test software 5, shut down computer, finish.
Maximum displacement Δ S between in the test servo hydraulic cylinder stroke range second or second above test section
MaxThe step of band loading friction force characteristic is: after tested servo hydraulic cylinder bottom adds cushion block, repeat maximum displacement Δ S between first test section
MaxThe testing procedure of band loading friction force characteristic.
In this embodiment, the working pressure of this test macro is P=31.5MPa, and the weight of frame 1 is 40t, and the maximum force that frame 1 is born is 50000KN, and the maximum deformation quantity of frame 1 is 2.6mm; Motor 10 is the Y250M-4 cage type asynchronous motor, oil pump 9 is the A4VSOMA/70R-PPB13N00N Variable plunger pump, filtrator 8 is DFB-H60 * 10C filtrator, electrohydraulic servo valve 13 is the D661G75HOCO6NSX2HO electrohydraulic servo valve, electromagnetic relief valve 12 is the DBW20B-2-30B/315G24NZ5L electromagnetic relief valve, displacement transducer 3 is the FX-5 displacement transducer, pressure transducer 4 is the HDA3845-B-010-000 pressure transducer, data collecting card 6 is the PCI-9118 data collecting card, tested hydraulic cylinder 2 is that internal diameter is the servo hydraulic cylinder of 1000mm, and test result is maximum kinetic force of friction f=247kN.
The principle of work of this method of testing is: during the overhanging extruding of the piston rod frame 1 of tested servo hydraulic cylinder 2, as shown in Figure 3, downward F of increased load gradually of piston rod is given in the distortion of frame 1 elastic stretching simultaneously
2, this moment hydraulic cylinder kinetic force of friction f also downwards (opposite) with the piston motion direction because that piston moves is very slow, can regard uniform motion as.The suffered thrust F of tested like this servo hydraulic cylinder rodless cavity
1With load F
2, kinetic force of friction f and piston deadweight G, can set up following equilibrium equation:
F
1＝F
2+f+G (1)
In the formula, F
1=P
1* S
1, S
1Area for tested servo hydraulic cylinder 2 rodless cavities; P
1Be the pressure of tested servo hydraulic cylinder 2 rodless cavities, can record by pressure transducer 4.
When the piston rod of tested servo hydraulic cylinder 2 was regained, as shown in Figure 4, frame 1 elastic deformation amount of tension reduced, and gave downward load F who reduces gradually of piston rod simultaneously
2, this moment, the kinetic force of friction f of servo hydraulic cylinder 2 made progress (opposite with the piston motion direction) the suffered thrust F of tested like this servo hydraulic cylinder 2 rodless cavities
1' and load F
2, can set up following equilibrium equation between kinetic force of friction f and the piston deadweight G:
F
1’+f＝F
2+G (2)
In the formula, F
1'=P
1' * S
1, S
1Area for tested servo hydraulic cylinder 2 rodless cavities; P
1' be the pressure of tested servo hydraulic cylinder 2 rodless cavities, can record by pressure transducer 4.
f＝(F
1-F
1’)/2＝(P
1-P
1’)S
1/2 (3)
Can draw accordingly in 2 one to-and-fro movement processes of tested servo hydraulic cylinder the friction force characteristic curve as shown in Figure 5, get the maximal value of f and be with loading friction force as maximum.
In this embodiment, D/A passage output slope control signal by computer-aided test software 5, be converted to the current signal of power amplification through servoamplifier 7, drive the electromagnet of electrohydraulic servo valve 13, thereby accurately control the flow of the P mouth of electrohydraulic servo valve 13, can accurately measure the band loading friction force of hydraulic cylinder 2 to A mouth or B mouth.
In whole test process, computer-aided test software 5 writes down pressure transducer 4 detected rodless cavity pressure signals and displacement transducer 3 detected displacement signals respectively by A/D-1 and A/D-2 passage, and be depicted as the band loading friction force characteristic curve of tested hydraulic cylinder 2, draw the maximum band loading friction force of tested hydraulic cylinder 2 in choosing surveyed area, the automaticity height.
Therefore, this embodiment has that system architecture is simple, test accurately and the high characteristics of automaticity, be fit to the accurately characteristics of test of all hydraulic cylinder band loading friction force.
Claims (4)
1, a kind of test macro of hydraulic cylinder with loading friction force characteristic, it is characterized in that oil pump [9] and coaxial connection of motor [10], the inlet port of oil pump [9] communicates with fuel tank [11], the oil-out of oil pump [9] communicates by the P mouth of filtrator [8] with electrohydraulic servo valve [13], the A mouth of electrohydraulic servo valve [13] or B mouth communicate with the rodless cavity of tested hydraulic cylinder [2], the B mouth of electrohydraulic servo valve [13] or the sealing of A mouth; The T mouth of the rod chamber of tested hydraulic cylinder [2] and electrohydraulic servo valve [13] communicates with fuel tank [11]; Be connected with electromagnetic relief valve [12] between the P mouth pressuring oil pipe road of electrohydraulic servo valve [13] and T mouth return line, tested hydraulic cylinder [2] is installed in the closed frame [1];
Between the cylinder body end face of tested hydraulic cylinder [2] rod chamber end and closed frame [1] displacement transducer [3] is housed, displacement transducer [3] is electrically connected with the A/D-1 mouth of data collecting card [6]; On the rodless cavity of tested hydraulic cylinder [2] and the pipeline that the A mouth or the B mouth of electrohydraulic servo valve [13] link to each other pressure transducer [4] is housed, pressure transducer [4] is electrically connected with the A/D-2 mouth of data collecting card [6]; One end of servoamplifier [7] is electrically connected with the electromagnet of electrohydraulic servo valve [13], and the other end of servoamplifier [7] is electrically connected with the D/A mouth of data collecting card [6], and data collecting card [6] and computer-aided test software [5] are installed in the computing machine.
2, the test macro of hydraulic cylinder with loading friction force characteristic according to claim 1 is characterized in that the main flow of described computer-aided test software [5] is:
S1-1: parameter maximum displacement Δ S is set
Max=1～2mm, initialization test variable, control voltage u
0=0, backhaul mark flag=0:
S1-2: scan A/D-1 passage and A/D-2 passage show and record A/D-1 mouth piston initial displacement S
0With A/D-2 mouth rodless cavity original pressure P
0
S1-3: send control voltage, u by the D/A-1 passage
N+1=u
n+ Δ u;
S1-4: scan A/D-1 passage, recording and analyses displacement S
n=UA/D, scan A/D-2 passage, record rodless cavity pressure P
n=UA/D;
S1-5: displacement calculating amount Δ S=S
n-S
0, judge that whether displacement Δ S is more than or equal to maximum displacement Δ S
Max, if not then turn back to S1-3, if then continue next step;
S1-6: judge whether backhaul mark flag is zero, if not then jump to S1-8, if then continue next step;
S1-7: the control voltage reverse Δ u=-Δ u that rises in value, backhaul mark flag=1;
S1-8: judge that whether displacement Δ S is greater than zero; If then turn back to S1-3, if not then continue next step;
S1-9: with displacement S
nBe horizontal ordinate, pressure P
nProduct P with rodless cavity area S
nS is an ordinate, draws band loading friction force characteristic curve;
S1-10: read corresponding same shift value S from curve
nP
nThe S value is calculated their difference and divided by 2, is band loading friction force f, gets the maximal value of f and is with loading friction force as maximum.
3, the test macro of hydraulic cylinder with loading friction force characteristic according to claim 2, the maximum flexibility deflection that it is characterized in that described closed frame [1] is greater than the maximum displacement Δ S of oil cylinder piston between the test section
Max
4, a kind of method of testing of hydraulic cylinder with loading friction force characteristic, it is characterized in that adopting " a kind of test macro of hydraulic cylinder with loading friction force characteristic ", with the test of loading friction force characteristic, maximum displacement Δ S between first test section in test fluid cylinder pressure [2] stroke range
MaxThe step of band loading friction force characteristic is:
S2-1: set up the pressure of electromagnetic relief valve [12], starter motor [10], hydraulic system is started working;
S2-2: start computing machine, open computer-aided test software [5];
S2-3: parameter maximum displacement Δ S is set in computer-aided test software [5]
Max, begin test;
S2-4: the test result of waiting for hydraulic cylinder [2] band loading friction force characteristic;
S2-5: hydraulic cylinder [2] band loading friction force characteristic curve and result of calculation deposit thereof are printed;
S2-6: disable motor [10] stops hydraulic work system;
S2-7: withdraw from computer-aided test software [5], shut down computer.
Maximum displacement Δ S between in test fluid cylinder pressure [2] stroke range second or second above test section
MaxThe step of band loading friction force characteristic is: after tested hydraulic cylinder [2] bottom adds cushion block, repeat maximum displacement Δ S between first test section
MaxThe testing procedure of band loading friction force characteristic.
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|---|---|---|---|
| CN2008102374070A CN101451893B (en) | 2008-12-25 | 2008-12-25 | Test system and test method for hydraulic cylinder with loading friction force characteristic |
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|---|---|---|---|
| CN2008102374070A CN101451893B (en) | 2008-12-25 | 2008-12-25 | Test system and test method for hydraulic cylinder with loading friction force characteristic |
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| CN101451893B CN101451893B (en) | 2010-09-08 |
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| CN107288953A (en) * | 2016-03-31 | 2017-10-24 | 宝山钢铁股份有限公司 | The servo-cylinder performance test methods and its test system of a kind of adaptive damping |
| CN105927615A (en) * | 2016-06-03 | 2016-09-07 | 南通纺都置业有限公司 | Device for detecting extending friction force of oil cylinder |
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| CN107542726B (en) * | 2016-06-29 | 2019-06-25 | 宝山钢铁股份有限公司 | Simulate the servo-cylinder performance testing equipment of actual condition |
| CN108412842A (en) * | 2018-05-04 | 2018-08-17 | 哈尔滨理工大学 | Hydraulic cylinder friciton compensation control method research |
| CN108386419A (en) * | 2018-05-31 | 2018-08-10 | 武汉科技大学 | HAGC cylinders band loading friction force characteristic test system and test method |
| CN114017423A (en) * | 2021-11-29 | 2022-02-08 | 成立航空股份有限公司 | Hydraulic part comprehensive test bench and test method thereof |
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