An advanced hydraulic proportional valve test and debug method
Abstract: The paper first introduces REXROTH's latest technology to produce the most comprehensive hydraulic test bed of the hydraulic proportional valve test methods were introduced, and then to the self-proportioning directional valve test program as an example of DASYLAB software programming Explained. Finally attached to the test results of the proportional valve test. 1 Introduction Shanghai Volkswagen Plant Services Division due to the needs of the hydraulic equipment maintenance, after more than a year of planning, in October 1998 from Germany introduced a hydraulic components test bed (Universal Test Rig). This test rig by the German REXROTH company. It has the proportion of valves, proportional pumps and other hydraulic proportional components for debugging, testing and other functions. The biggest technical feature of the test bench proportional valve test is that users can easily design the test program according to their own test requirements using DASYLAB software, although there is no ready-made test program for each proportional valve test. Therefore, the test bed function can get the maximum play. 2 Proportional valve test, debugging technology background introduction In the hydraulic component test technology, the proportion of the valve test more difficult, rapid development of test methods. In the conventional components of the test, the test conditions change is usually achieved by hand, working conditions point is limited, discrete. The test results are also recorded by hand reading the test form. Proportional valve test and conventional components of the test is different from its operating conditions change is continuous, the test results are continuous, usually through the characteristic curve to reflect the test results. Routine proportional valve debugging, the testing process is as follows: With the signal generator according to the test requirements generated ramp, triangle wave and other control signals and access to the proportional valve, proportional valve conditions have moved. Controlled pressure, flow and other operating parameters recorded by the corresponding sensor XY recorder. This gives a characteristic curve that reflects the behavior of the proportional valve between the controlled variable (pressure, flow, etc.) and the control signal (current, etc.). In the late 1980s, with the development of computer technology, computer assisted debugging of proportional valve and testing system began to emerge. For example, Baosteel Integrated Hydraulic Test Bench Proportional Valve Test System developed by CIT with C language and Zhejiang University with Turbo C language Hangzhou Hydraulic Factory Proportional Valve Test System. In these systems, all adopt the hardware system of "microcomputer + AD / DA acquisition card" and the corresponding sensing and conversion circuit to make signal acquisition and collection. In combination with the special software, a proportional valve test system is used to replace the signal generator and XY record instrument. Proportional valve auxiliary test system and conventional test system compared to many advantages. First, the signal is more flexible. Computer signals are composed of digital sequences, which can be based on test requirements, the preparation of any number of difficult sequences, but the analog circuit is difficult to achieve. Second, the test curve can be displayed in real time on the screen, saved as a file, printed, and easily analyzed afterwards for recorded digital sequences, which is difficult to achieve with traditional XY recorders. In short, computer-aided testing system is a development direction of the proportion valve testing, debugging methods. At present, the common domestic proportion valve auxiliary test system is basically a special software designed with C language, the user can only test in accordance with pre-designed projects in the program. There is little scope for the user to participate in the experimental design himself, and generally it is limited to changing the test parameters. In this way, the scope of application of the test stand has been limited. Shanghai Volkswagen hydraulic test bed proportional valve test, the core of the debugging system is the use of DASYLAB software. DASYLAB software takes full advantage of the technical features of the graphical user interface (GUI) and object-oriented programming (OOP) in Microsoft Windows and provides digital to analog and digital converter modules, event modules, signal generation modules, display modules, file modules, Processing modules and other functions of many modules. The user simply according to their own test requirements, the combination of functional modules easily through the preparation of test procedures. In the entire proportional valve test system, there is no ready-made test procedures. Any proportional valve test requires the user to prepare the test procedure according to his own test requirements. This is the biggest feature of the test bed, but also with the previous proportional valve computer-aided testing system, the biggest difference. 3 Proportional Valve Test, Commissioning System Introduction Figure 1 shows the test system associated with the proportional valve test. Fig.1 Schematic diagram of proportional valve test system The main oil source of the system consists of volumetric throttling speed regulating system composed of proportional constant pressure pump and proportional speed regulating valve. The computer controls the pressure and flow of the main system through AO00 and AO02. The power element test is loaded with a proportional throttle or a proportional relief valve. Load signal provided by AO01. The test signal of the proportion of components tested by the AO03. AI01 and AI02 were collected two different flowmeter flow measurement signal. According to the measured flow range, by switching the oil can choose to test the flow meter. AI09 ~ AI14 were taken from different pressure sensors range. According to the test requirements and the scope of the measured pressure, you can choose and access the appropriate pressure measurement point suitable pressure sensor. AI07 and AI08 are taken from the temperature sensor, according to the need to access the appropriate measuring point. AI00, AI03 Fixed connection Pressure sensor and tank temperature measuring outlet pressure of main pump. AI04, AI05, A106 Torque / speed meter permanently connected to the test power unit. AI15 acquisition target proportional amplifier board actual output voltage signal. Proportional valve test design process is as follows: 1) to determine the test parameters and the characteristics of the curve you want to get. For example, observe that the working flow of the directional control valve varies with the control voltage in the time domain; and 2) Design and determine the hydraulic circuit for the test. The hydraulic system of this test bench adopts modularized and modular design, and the test circuit can be conveniently assembled through the quick connector. 3) The pressure and flow sensor are selected according to the specifications of the tested valve and the test range. 4) Signal the actual operation of the AI ​​and AO, such as AI02, AI12, AI11 and AO03, AO00, AO02; 6) use DASYLAB software to process the signal Generate, send, collect, filter, display, record and other requirements. Next, use DASYLAB software to compile a practical program of the proportional directional valve test to illustrate the above process. 4 Proportional Directional Valve Test The tested proportional valve is 4WRZ10 W50-41 / 6A24NE TZ4 / M. Test program shown in Figure 2. The test results are shown in Figure 3. This test, we hope to observe the work flow, the pressure before the valve back to back pressure with the control voltage changes. Observe the test results in the time domain. Figure 2 Proportional Directional Valve Test Procedure Figure 3 Proportional Directional Valve Test Results Figure 2 is now illustrated. First select the AI02, AI12, AI11 channels in the AD module, which collect the flow from the FM2 flowmeter, the valve pressure P, the valve back pressure T (valve back pressure), and then real-time acquisition of the digital sequence Filter, average, calibrate, and then display the 3 signals in real time with the digital sequence sent to the proportional valve in the display module Record00. At the same time the 4-digit sequence and time series written to the hard disk. The start of the experiment, this process flow began to work. After the test begins, you need to set the main pump pressure, flow. The main pump operating conditions should not change too abruptly, so the main pump parameters are gently changed by the sequencers SWG Pressure and SWG Flow. These sequence values ​​are implemented through the DO00, DO02 channels of the DA module. After setting the main pump parameters, it is necessary to give the digital sequence of the control signal of the proportional valve to be tested. Through this digital sequence will be the proportion of the valve operating conditions according to the test requirements. This is mainly achieved through the DO03 channel of the SWG Pressu01 Sequence Module and DA Module. The digital sequence generated by SWG Pressu01 enters the DA module on the one hand to control the target proportional valve and on the other hand the recording module Recoder00 for the real-time display of signals. In the program, the event module plays a very important role in the process of arranging the experiment and the assignment of variables. For example, the start module initiates the parameter setting of the main pump, the hot keys such as LEFT and RIGHT trigger the assignment of the global variables V50 and V51, The MESSAGE module initiates the control of the test proportional valve and stores the data collected at this time in a new file name. Figure 3 is the test results. It can be seen from the control valve proportional voltage control of the situation. From the back pressure curve you can see the oil return resistance changes with the flow of the situation. 5 Conclusion Shanghai Volkswagen hydraulic test bed proportional valve test method greatly exerted the function of the test bed for the test bench secondary technology development provides a broad free play space. Abstract: The paper first introduces REXROTH's latest technology to produce the most comprehensive hydraulic test bed of the hydraulic proportional valve test methods were introduced, and then to the self-proportioning directional valve test program as an example of DASYLAB software programming Explained. Finally attached to the test results of the proportional valve test. 1 Introduction Shanghai Volkswagen Plant Services Division due to the needs of the hydraulic equipment maintenance, after more than a year of planning, in October 1998 from Germany introduced a hydraulic components test bed (Universal Test Rig). This test rig by the German REXROTH company. It has the proportion of valves, proportional pumps and other hydraulic proportional components for debugging, testing and other functions. The biggest technical feature of the test bench proportional valve test is that users can easily design the test program according to their own test requirements using DASYLAB software, although there is no ready-made test program for each proportional valve test. Therefore, the test bed function can get the maximum play. 2 Proportional valve test, debugging technology background introduction In the hydraulic component test technology, the proportion of the valve test more difficult, rapid development of test methods. In the conventional components of the test, the test conditions change is usually achieved by hand, working conditions point is limited, discrete. The test results are also recorded by hand reading the test form. Proportional valve test and conventional components of the test is different from its operating conditions change is continuous, the test results are continuous, usually through the characteristic curve to reflect the test results. Routine proportional valve debugging, the testing process is as follows: With the signal generator according to the test requirements generated ramp, triangle wave and other control signals and access to the proportional valve, proportional valve conditions have moved. Controlled pressure, flow and other operating parameters recorded by the corresponding sensor XY recorder. This gives a characteristic curve that reflects the behavior of the proportional valve between the controlled variable (pressure, flow, etc.) and the control signal (current, etc.). In the late 1980s, with the development of computer technology, computer assisted debugging of proportional valve and testing system began to emerge. For example, Baosteel Integrated Hydraulic Test Bench Proportional Valve Test System developed by CIT with C language and Zhejiang University with Turbo C language Hangzhou Hydraulic Factory Proportional Valve Test System. In these systems, all adopt the hardware system of "microcomputer + AD / DA acquisition card" and the corresponding sensing and conversion circuit to make signal acquisition and collection. In combination with the special software, a proportional valve test system is used to replace the signal generator and XY record instrument. Proportional valve auxiliary test system and conventional test system compared to many advantages. First, the signal is more flexible. Computer signals are composed of digital sequences, which can be based on test requirements, the preparation of any number of difficult sequences, but the analog circuit is difficult to achieve. Second, the test curve can be displayed in real time on the screen, saved as a file, printed, and easily analyzed afterwards for recorded digital sequences, which is difficult to achieve with traditional XY recorders. In short, computer-aided testing system is a development direction of the proportion valve testing, debugging methods. At present, the common domestic proportion valve auxiliary test system is basically a special software designed with C language, the user can only test in accordance with pre-designed projects in the program. There is little scope for the user to participate in the experimental design himself, and generally it is limited to changing the test parameters. In this way, the scope of application of the test stand has been limited. Shanghai Volkswagen hydraulic test bed proportional valve test, the core of the debugging system is the use of DASYLAB software. DASYLAB software takes full advantage of the technical features of the graphical user interface (GUI) and object-oriented programming (OOP) in Microsoft Windows and provides digital to analog and digital converter modules, event modules, signal generation modules, display modules, file modules, Processing modules and other functions of many modules. The user simply according to their own test requirements, the combination of functional modules easily through the preparation of test procedures. In the entire proportional valve test system, there is no ready-made test procedures. Any proportional valve test requires the user to prepare the test procedure according to his own test requirements. This is the biggest feature of the test bed, but also with the previous proportional valve computer-aided testing system, the biggest difference. 3 Proportional Valve Test, Commissioning System Introduction Figure 1 shows the test system associated with the proportional valve test. Fig.1 Schematic diagram of proportional valve test system The main oil source of the system consists of volumetric throttling speed regulating system composed of proportional constant pressure pump and proportional speed regulating valve. The computer controls the pressure and flow of the main system through AO00 and AO02. The power element test is loaded with a proportional throttle or a proportional relief valve. Load signal provided by AO01. The test signal of the proportion of components tested by the AO03. AI01 and AI02 were collected two different flowmeter flow measurement signal. According to the measured flow range, by switching the oil can choose to test the flow meter. AI09 ~ AI14 were taken from different pressure sensors range. According to the test requirements and the scope of the measured pressure, you can choose and access the appropriate pressure measurement point suitable pressure sensor. AI07 and AI08 are taken from the temperature sensor, according to the need to access the appropriate measuring point. AI00, AI03 Fixed connection Pressure sensor and tank temperature measuring outlet pressure of main pump. AI04, AI05, A106 Torque / speed meter permanently connected to the test power unit. AI15 acquisition target proportional amplifier board actual output voltage signal. Proportional valve test design process is as follows: 1) to determine the test parameters and the characteristics of the curve you want to get. For example, observe that the working flow of the directional control valve varies with the control voltage in the time domain; and 2) Design and determine the hydraulic circuit for the test. The hydraulic system of this test bench adopts modularized and modular design, and the test circuit can be conveniently assembled through the quick connector. 3) The pressure and flow sensor are selected according to the specifications of the tested valve and the test range. 4) Signal the actual operation of the AI ​​and AO, such as AI02, AI12, AI11 and AO03, AO00, AO02; 6) use DASYLAB software to process the signal Generate, send, collect, filter, display, record and other requirements. Next, use DASYLAB software to compile a practical program of the proportional directional valve test to illustrate the above process. 4 Proportional Directional Valve Test The tested proportional valve is 4WRZ10 W50-41 / 6A24NE TZ4 / M. Test program shown in Figure 2. The test results are shown in Figure 3. This test, we hope to observe the work flow, the pressure before the valve back to back pressure with the control voltage changes. Observe the test results in the time domain. Figure 2 Proportional Directional Valve Test Procedure Figure 3 Proportional Directional Valve Test Results Figure 2 is now illustrated. First select the AI02, AI12, AI11 channels in the AD module, which collect the flow from the FM2 flowmeter, the valve pressure P, the valve back pressure T (valve back pressure), and then real-time acquisition of the digital sequence Filter, average, calibrate, and then display the 3 signals in real time with the digital sequence sent to the proportional valve in the display module Record00. At the same time the 4-digit sequence and time series written to the hard disk. The start of the experiment, this process flow began to work. After the test begins, you need to set the main pump pressure, flow. The main pump operating conditions should not change too abruptly, so the main pump parameters are gently changed by the sequencers SWG Pressure and SWG Flow. These sequence values ​​are implemented through the DO00, DO02 channels of the DA module. After setting the main pump parameters, it is necessary to give the digital sequence of the control signal of the proportional valve to be tested. Through this digital sequence will be the proportion of the valve operating conditions according to the test requirements. This is mainly achieved through the DO03 channel of the SWG Pressu01 Sequence Module and DA Module. The digital sequence generated by SWG Pressu01 enters the DA module on the one hand to control the target proportional valve and on the other hand the recording module Recoder00 for the real-time display of signals. In the program, the event module plays a very important role in the process of arranging the experiment and the assignment of variables. For example, the start module initiates the parameter setting of the main pump, the hot keys such as LEFT and RIGHT trigger the assignment of the global variables V50 and V51, The MESSAGE module initiates the control of the test proportional valve and stores the data collected at this time in a new file name. Figure 3 is the test results. It can be seen from the control valve proportional voltage control of the situation. From the back pressure curve you can see the oil return resistance changes with the flow of the situation. 5 Conclusion Shanghai Volkswagen hydraulic test bed proportional valve test method greatly exerted the function of the test bed for the test bench secondary technology development provides a broad free play space.
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