CN103196660A - Multistation computer test system facing multitandem valves - Google Patents

Abstract

The invention discloses a multi-station computer testing system for multi-way valves. The test system includes a computer data processing system, several test stations composed of data acquisition system, hydraulic system, multi-way valves under test, sensors and 485 bus. The system can carry out various tests of multi-way valves. Each oil port is equipped with a pressure sensor and a flow sensor, which can collect pressure and flow signals during the test, convert the pressure and flow signals into electrical signals, and convert them into digital signals through A/D. After the signal is received, the single-chip microcomputer program converts it into pressure and flow data, stores it in the data storage module, and displays it through the display module at the same time; the computer data processing system reads the data in the data storage module of each station through the 485 bus, and writes it into the database for processing. Analyze and process, and generate reports, each test station can work simultaneously or independently without interfering with each other. The invention can provide fast and effective computer-aided test means for multi-way valve test.

Description

A multi-station computer testing system for multi-way valves

technical field

The invention relates to the field of hydraulic valve testing, in particular to a multi-station computer testing system for multi-way valves.

Background technique

The multi-way valve is a key component used to change the on-off relationship of each oil circuit in hydraulic transmission and control, and its performance index is directly related to the quality of the entire hydraulic system. Before leaving the factory, each multi-way valve must be strictly tested for its parameters through various instruments to check whether its performance meets the requirements of relevant indicators. Only qualified multi-way valves can leave the factory, and only in this way can the normal operation of the entire hydraulic system composed of them be guaranteed. Especially for new products, it is necessary to test whether the products meet all the requirements of the technical specifications through type tests before they are officially put into production.

At present, most of the multi-way valve tests are done manually. The test data are measured by pressure gauges and flow meters, and are manually recorded. The test results are also obtained by manual analysis. This test method is susceptible to human factors and automation. It is difficult to meet the quality control requirements of large quantities of parts due to the shortcomings of low degree and low measurement efficiency.

Contents of the invention

The purpose of the present invention is to solve the above problems and provide an advanced multi-station computer testing system for multi-way valves, which can automatically collect and intelligently analyze various test data of multi-way valves, and improve the efficiency of multi-way valve testing , to increase the credibility of the test results. The entire test method is formulated in accordance with the JB/T 8729.2-1998 "Test Method for Hydraulic Multi-way Reversing Valve", which can complete various tests of multi-way valves, and automatically display and output test results.

In order to achieve the above object, the present invention adopts the following technical solutions: a multi-station computer test system for multi-way valves of the present invention is composed of a computer data processing system, several test stations and 485 bus, each test station It consists of data acquisition system, hydraulic system, tested multi-way valve and sensors.

The various test stations described above can implement various tests of multi-way valves, including: multi-way valve control pressure and flow curve test, multi-way valve control pressure and working pressure curve test, multi-way valve leakage under different working pressures Volume curve test, multi-way valve flow resistance curve test and multi-way valve loading pressure and flow curve test.

The connection relationship between the hydraulic system and the sensor is: the 35MPa pressure sensor is connected to the P port, A port and B port of the test bench through the pressure measuring joint, and the 10MPa pressure sensor is respectively connected to the a port and the b port of the test bench through the pressure measuring joint , the 200L/min flow sensor is connected to the P port, A port, B port of the test bench and the multi-way valve under test respectively through the pipeline, and the 2000ml/min flow sensor is connected to the T port of the test bench and the multi-way valve under test respectively through the pipeline .

The data acquisition system includes single-chip microcomputer, A/D converter, flow sensor, pressure sensor, signal conditioning circuit, multi-channel analog switch, sample and hold circuit, clock module, display module, communication module, button and data storage module. Wherein the flow sensor and the pressure sensor are respectively connected with the signal conditioning circuit; the multi-channel analog switch is connected with the signal conditioning circuit, the sampling and holding circuit and the single-chip microcomputer; the sampling and holding circuit is connected with the single-chip microcomputer and the A/D converter ; The single-chip microcomputer is connected with a clock module, a display module, a button, a data storage module, an A/D converter and a communication module.

The computer data processing system includes a PC, a monitor, a printer and a 232/485 converter. The PC is connected with the display and the printer, and connected with the 485 bus through the 232/485 converter, and the communication modules of the data acquisition systems of each test bench are connected with the 485 bus.

The working principle of the present invention is as follows:

Install flanges or joints on each oil port of the multi-way valve to be tested, connect the oil inlet P port, A port, B port and T port of the multi-way valve with the flow sensor respectively, and the pilot oil ports a and b It is connected to the control oil ports a and b on the test bench, and the test plan is entered into the computer data processing system before the test, and the test must be carried out in strict accordance with the test plan. The sensors installed at each oil port read the pressure and flow data according to the needs of different tests, and display them through the display module. The signals of each sensor are amplified and filtered by the signal conditioning circuit, input through the multi-channel analog switch controlled by the single-chip microcomputer, and the sampling and holding circuit Enter the sampling mode, enter the hold mode after the signal is input, keep the output voltage unchanged, then the signal is A/D converted, after the conversion, the data is stored in the data storage module, and the computer data processing system reads the data storage of each test bench in turn Module data, and write to the database. After the test is over, the test results and test curves of each test can be viewed and analyzed through the computer data processing system, and the report can be printed out through the printer.

Compared with prior art, the present invention has following advantage:

1) High degree of automation and fast measurement speed

Due to the adoption of a data acquisition system composed of pressure sensors, flow sensors and single-chip microcomputer systems, the automatic collection and storage of test data is realized;

2) The test results are accurate and credible

Since the pressure and flow data are measured by high-precision pressure sensors and flow sensors, and various test curves are drawn by the software, no manual intervention is required, which ensures the accuracy and reliability of the test results;

3) Intelligent analysis of measurement results

Due to the use of process capability index, machine capability index, control chart and other methods to carry out quality statistical analysis on the measurement results of the tested valve, it is not only possible to confirm whether the processing capability of the equipment and the processing process meet the quality requirements, but also to monitor the quality of the process in real time. Fluctuation, to determine whether the process is stable.

Description of drawings

Fig. 1 is the overall structural representation of the present invention;

Fig. 2 is each test bench hydraulic system schematic diagram of the present invention;

Fig. 3 is a block diagram of data acquisition principle of the present invention;

Fig. 4 is the working program flowchart of the present invention.

In the figure: 1, data acquisition system; 101, single-chip microcomputer; 102, clock module; 103, data storage module; 104, communication module; 105, button; 106, display module; 107, A/D converter; 108, sampling and holding Circuit; 109, multi-channel analog switch; 110, signal conditioning circuit; 2, hydraulic system; 201, shut-off valve I; 202, shut-off valve II; 203, loading valve I; 204, loading valve II; 205, shut-off valve III; 206, throttle valve; 207, multi-way directional valve I; 208, overflow valve I; 209, main pump; 210, auxiliary pump; 211, overflow valve II; 212, multi-way directional valve II; 213, Pressure reducing valve I; 214, pressure reducing valve II; 215, pressure measuring joint; 3, multi-way valve under test; 4, sensor; 41, 35MPa pressure sensor; 42, 10MPa pressure sensor; 43, 200L/min flow sensor; 44. 2000ml/min flow sensor; 5. Computer data processing system; 51. Display; 52. PC; 53. Printer; 54. 232/485 converter; 6. 485 bus.

Detailed ways

A schematic diagram of the overall structure of a multi-station computer testing system for multi-way valves of the present invention is shown in Figure 1, the system is composed of a computer data processing system (5), several test stations and 485 bus (6) , each test station is composed of a data acquisition system (1), a hydraulic system (2), a multi-way valve under test (3) and a sensor (4).

The computer data processing system (5) includes a PC (52), a display (51), a printer (53) and a 232/485 converter (54). Described PC (52) is connected with display (51) and printer (53), and is connected with 485 bus (6) by 232/485 converter (54), the communication module of each test bench data acquisition system (1) (104) is connected with 485 bus (6).

A schematic diagram of the test bed hydraulic system of a multi-station computer test system facing multi-way valves of the present invention is shown in Figure 2, and the connection relationship between the hydraulic system (2) and the sensor (4) is: 35MPa pressure sensor ( 41) Connect the P port, A port and B port of the test bench respectively through the pressure measuring joint (215), and connect the 10MPa pressure sensor (42) to the a port and the b port of the test bench through the pressure measuring joint (215), and the flow rate is 200L/min The sensor (43) is respectively connected to the test bench P port, A port, B port and the multi-way valve (3) through the pipeline, and the 2000ml/min flow sensor (44) is respectively connected to the test bench T port and the tested multi-way valve (3) through the pipeline. Multi-way valve (3) is connected.

A block diagram of a multi-station computer testing system for multi-way valves of the present invention is shown in Figure 3, and the data acquisition system (1) includes a single-chip microcomputer (101), a clock module (102), a data storage module (103 ), communication module (104), button (105), display module (106), A/D converter (107), sample and hold circuit (108), multi-channel analog switch (109) and signal conditioning circuit (110). Wherein said signal conditioning circuit (110) is respectively connected with 35MPa pressure sensor (41), 10MPa pressure sensor (42), 200L/min flow sensor (43) and 2000ml/min flow sensor (44); The analog switch (109) is connected with the signal conditioning circuit (110), the sampling and holding circuit (108) and the single-chip microcomputer (101); the described sampling and holding circuit (108) is connected with the single-chip microcomputer (101) and the A/D converter (107) ; Described single-chip microcomputer (101) is connected with clock module (102), display module (106), button (105), data storage module (103), A/D converter (107) and communication module (104); Wherein The button (105) includes a data acquisition system (1) switch button, a test type button and a sampling switch button; the data acquisition system (1) switch button is used to control the opening and closing of the data acquisition system (1) Because the data that different tests need to gather is different, described test type button is used for selecting test number, and single-chip microcomputer (101) selects to read the data of the sensor that this test needs to gather by reading this test number, and saves into the data storage module; the sampling switch button is used to control the start and stop of data collection.

The working principle of the present invention is as follows:

Install flanges or joints on each oil port of the multi-way valve to be tested, connect the oil inlet P port, A port, B port and T port of the multi-way valve with each flow sensor respectively, and the pilot oil ports a, b The port is connected to the control oil ports a and b on the test bench. Before the test starts, the test plan should be entered into the computer data processing system, and the test must be carried out in strict accordance with the test plan. The sensors installed at each oil port read the pressure and flow data according to the needs of different tests, and display them through the display module. The signals of each sensor are amplified and filtered by the signal conditioning circuit, input through the multi-channel analog switch controlled by the single-chip microcomputer, and the sampling and holding circuit Enter the sampling mode, enter the hold mode after the signal is input, keep the output voltage unchanged, then the signal is A/D converted, after the conversion is completed, the data is stored in the data storage module, and the computer data processing system reads the data of each test station in turn Store the data in the module and write it to the database. After the test is over, the test results and test curves of each test can be viewed and analyzed through the computer data processing system, and the report can be printed out through the printer.

The following is an example of the multi-way valve control pressure and flow curve test to illustrate the working principle. Before performing the P to A test, operate the multi-way reversing valve II (212) through the handle to make it work in the left position, and open the stop valve I ( 201) Connect port A to port B, operate the multi-way reversing valve I (207) through the handle, make it work in the right position, start the test, view the flow data of port P through the display module, and adjust the flow rate of port P to meet the test requirements At this time, press the sampling switch button, and then adjust the pressure reducing valve I (213) so that the pressure at port a gradually increases within the range of 0.6MPa to 2.5MPa. At this time, press the sampling switch button again to make the switch pop up and stop sampling , the flow sensor set at port A reads the flow data, and the curve of the flow rate at port A changing with the control pressure at port a can be obtained; then the test from P to B is carried out, and the multi-way reversing valve II (212) is operated by the handle to make it Work in the right position, and open the shut-off valve I (201) to connect port A to port B, operate the multi-way reversing valve I (207) through the handle to make it work in the right position, start the test, and check the flow data of port P through the display module , and adjust the flow rate of port P to meet the test requirements. At this time, press the sampling switch button, and then adjust the pressure reducing valve II (214) so that the pressure at port b gradually increases within the range of 0.6MPa to 2.5MPa. At this time, press the sampling button again Switch the button to make the switch pop up, stop sampling, and read the flow data from the flow sensor installed at port B to obtain the curve of the flow rate at port B changing with the control pressure at port b. The rest of the test operation methods are similar to this, so they will not be described in detail.

Work procedure flowchart of the present invention is as shown in Figure 4, and its steps are:

1) Test preparation

Clean the tested valve, check the test bench and electrical equipment, and enter the test plan in the computer data processing system. The content of each record in the test plan table includes part number, test date, and which tests need to be carried out.

2) Install the multi-way valve under test

Install flanges or joints on each oil port of the multi-way valve to be tested, connect the oil inlet P port, A port, B port and T port of the multi-way valve with each flow sensor respectively, and the pilot oil ports a, b The port is connected to port a and port b on the test bench.

3) Data acquisition system initialization

After the system power is turned on, a series of initialization work is carried out under the control of the single-chip microcomputer software, including the initialization work of state variables and values in each register.

4) Select the test items and proceed sequentially

Switch to the first test to be carried out through the test type button. The test items must be carried out in strict accordance with the test plan formulated in advance, then start the data communication interface in the computer data processing system, press the sampling switch button, start collecting data and carry out the test During the test, the single-chip microcomputer system reads the data of each sensor required for the test and stores them in the data storage module. At the same time, the data of each sensor can be displayed in real time through the display module. The computer data processing system reads the data in turn according to the designed time slice. The data in the data storage module in each multi-way valve test bench is written into the database; when a test is completed, press the sampling switch button again to make the switch pop up, stop collecting data, and then pass the test type on the test bench button to switch to the next test, then press the sampling switch button to start the test, and so on until the last test is completed.

5) Disassemble the multi-way valve under test

When the test of a tested valve is completed according to the test plan, disassemble the tested valve and move the tested valve that has completed the test to the designated position.

6) Generate test reports and print reports

Enter the report management interface in the computer data processing system, view the test results and test curves of each test, use the process capability index, machine capability index and control chart to conduct quality statistical analysis on the measurement results of the tested valve, and can pass the printer Print out the report.

The process described above is the workflow of one test station, and each test station can work simultaneously or independently according to the needs without interfering with each other.

Claims (2)

1. A multi-station computer test system for multi-way valve is characterized in that it is made up of a computer data processing system, several test stations and 485 bus, and each test station is composed of data acquisition system (1), hydraulic pressure System (2), tested multi-way valve (3) and sensor (4); data acquisition system (1) includes single-chip microcomputer (101), clock module (102), data storage module (103), communication module (104) , button (105), display module (106), A/D converter (107), sample and hold circuit (108), multi-channel analog switch (109) and signal conditioning circuit (110); signal conditioning circuit (110) respectively Connect with 35MPa pressure sensor (41), 10MPa pressure sensor (42), 200L/min flow sensor (43) and 2000ml/min flow sensor (44); multi-channel analog switch (109) and signal conditioning circuit (110), sampling The holding circuit (108) is connected with the single-chip microcomputer (101); the sampling and holding circuit (108) is connected with the single-chip microcomputer (101) and the A/D converter (107); the single-chip microcomputer (101) is connected with the clock module (102), the display module (106) , button (105), data storage module (103), A/D converter (107) and communication module (104) are connected; Computer data processing system (5) comprises PC (52), display (51), printer ( 53) and 232/485 converter (54); Described PC (52) is connected with display (51) and printer (53), and is connected with 485 bus (6) by 232/485 converter (54), The communication modules (104) of the data acquisition systems (1) of each test bench are connected to the 485 bus (6). 2. a kind of multi-station multi-way valve test system according to claim 1 is characterized in that button (105) comprises data acquisition system (1) switch button, test type button and sampling switch button; Described data acquisition The system (1) switch button is used to control the opening and closing of the data acquisition system (1); because the data collected by different tests is different, the test type button is used to select the test number, and the single-chip microcomputer (101) passes the reading The test number is used to select and read the sensor data that needs to be collected for the test, and store it in the data storage module; the sampling switch button is used to control the start and stop of data collection.

Images