KR100209274B1 - Automatic efficiency tester for pump - Google Patents

Abstract

The present invention relates to a hydraulic pump performance tester for testing the performance of a hydraulic pump, and a hydraulic pump performance tester according to the present invention, in order to achieve the above object, A / D converter that converts the physical quantity of temperature, flow rate, speed, and noise to digital value, motor control means such as RS-323C, D / A converter and DI / O, clamping control, valve sequence control, And DI / O for warning control.

Description

Hydraulic pump automatic performance measurement tester using computer control

The present invention relates to a hydraulic pump performance tester for testing the performance of a hydraulic pump. More particularly, the present invention relates to a hydraulic pump performance tester that automates, optimizes, and efficiently performs a series of processes for testing performance of a hydraulic pump, And a performance tester.

The industrial hydraulic pump is now in increasing demand as the automobile industry develops and is being produced in large quantities on the plant. Accordingly, reliability evaluation of these pumps has been demanded. Tests for these pumps are made through the basic hydraulic circuit configuration. FIG. 1 is a diagram showing a configuration of a conventional hydraulic pump performance tester. As shown in FIG. 1, the heater 13, the oil level measuring means 12 and the temperature measuring means 11 are mounted on the oil tank 10 in which the oil is contained, one side is connected to the oil tank 10, The pipeline 1 in which the pump 2 is disposed is connected to the suction port 3a of the test pump 3 and the discharge pressure from the discharge port 3b of the test pump 3 to the oil tank 10, The gauge 2 ', the check valve 5, the pressure, temperature and flow measuring means 6, the relief valve 4, the flow meter 7, the cooling heat exchanger 8 and the filter 9 are sequentially Respectively. In operation, the test pump 3 sucks and extrudes hydraulic oil from the tank, and the discharge pressure of the hydraulic oil is controlled through the relief valve 4. The hydraulic fluid is returned to the tank through the check valve 5 for preventing the backflow through the pressure, temperature, flow rate measuring means 6 and cooling heat exchanger 9.

That is, the hydraulic pump is rotated by the rotation speed of each step through the driving of the motor, and the flow rate, pressure, temperature, noise, etc. of the hydraulic fluid discharged from the pump are measured by various sensors, and the pressure of the relief valve on the hydraulic pipeline is measured To determine various performance and characteristics of the hydraulic pump.

However, in the past, when automating such a series of processes, it was possible to test only one kind of pump by using the PLC control method. In the case of automatically testing another type of pump, it is difficult to change the program, The control memory is large and the execution speed is slow, which makes it difficult to control in real time. In addition, there is a disadvantage in that the equipment occupies a large volume and can not flexibly cope with various test conditions that change frequently.

An object of the present invention is to provide a hydraulic control system that can be applied to all pumps by using a computer control system which uses DI / O, A / D converter, D / A converter, timer and RS- Pump performance tester.

In addition, an experimental condition changing program that can easily control the experimental steps when the hydraulic pump type is changed, and a calibration program that can reset the reference value to compensate when the measuring sensor and control valves are replaced And to provide a hydraulic pump performance tester capable of flexibly coping with various experimental environments.

FIG. 1 is a block diagram of a conventional hydraulic pump performance tester. FIG.

FIG. 2 is a general control configuration diagram of a hydraulic pump performance tester according to the present invention. FIG.

FIG. 3 is a configuration diagram showing motor speed control of a hydraulic pump performance tester according to the present invention; FIG.

FIG. 4 is a schematic view showing a spout sequence control of a hydraulic pump performance tester according to the present invention; FIG.

FIG. 5 is a block diagram of warning and self-correcting control of the hydraulic pump performance tester according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

1,9: Filter 7: Flowmeter

2: pressure gauge 8: cooling heat exchanger

3: Test pump 10: Tank

4: relief valve 11: temperature measuring means

5: Check valve 12: Oil level measuring means

6: pressure, temperature, flow measuring means 13: heater

In order to achieve the above object, a hydraulic pump performance tester according to the present invention comprises an A / D converter for converting physical quantities such as pressure, temperature, flow rate, O / DC converter, DI / O for motor control means such as DI / O, clamping control, valve sequence control, tank control, DI / O for alarm control, etc. The components are connected to a computer, .

Here, the motor speed control means includes a computer, a servo mechanism connected to the motor, a DI / O connected to the computer, a speed setting resistor connected between the DI / O and the servo mechanism, A D / A converter, a RS-232C and a timer connected to the computer.

Further, the valve sequence control means includes a DI / O and a timer connected to the computer, the computer respectively, and a relay connected to the DI / O and the plurality of spokes.

In addition, the warning control means includes a DI / O connected between the computer, the computer and a plurality of lamps or alarms.

Such a construction is shown in detail in FIG. 5 of the second drawing. Hereinafter, the operation of the hydraulic pump performance tester according to the present invention will be described in detail with reference to the drawings.

The overall control configuration of the present invention is shown in FIG. The computer issues a command via the D / A converter 104, the timer 105 and the DI / O 106 according to a given setting condition and feeds back the command via the RS-232C 102 and the A / D converter 103 Make a judgment. In more detail, the number of revolutions of the motor is controlled through the D / A converter 104, the timer 105, and the DI / O 106. In particular, control of the relief valve sequence for pressure control through the DI / O 106, the oil surface and temperature of the tank, and other additional devices are controlled.

The result of the command measures the pressure, the temperature, the flow rate, the number of rotations and the noise in each measuring device and feeds back to the computer through the A / D converter 103 to judge the test result.

In other words, all the control computers are responsible for motor speed control, valve sequence control, warning control, judgment control, self-diagnosis control, correction control, data graphic processing and data acquisition. . Therefore, since the computer has a lot of memory even in a small volume compared with the PLC, it is possible to control relatively finer than the conventional PLC. In addition, since the execution speed is much faster than PLC, it can control many I / O contacts and step by step in real time. In addition, it has an advantage of real time graphic processing. In the case of data processing, too many contact points are required in the PLC, and many execution speeds are required depending on the contact processing, or the computer can be used to shorten a lot of time. Above all, the important advantage is that users can modify various conditions easily through program modification, so that more flexible performance test is possible and can be used for research.

FIG. 3 shows the speed control configuration 200 of the motor.

The RS-232C 102 controls the rotational speed of the motor according to the operation of the computer 105. The RS- Directional communication between the motor and the motor.

That is, a command of the set speed is inputted to the servo mechanism 201 of the motor by using the DI / O 106, the speed setting resistor 203 and the D / A converter 104, Let it rotate at the designated rotation speed.

FIG. 4 shows a block diagram of the valve sequence control configuration 300. The control valves 311, 312, ..., and 31n are controlled by the ON / OFF sequence using the computer 101, the timer 105, the DI / O 106, and the relay 301 so that the solenoid valves And the ON / OFF holding time can be set freely through the timer 105, so that the performance of each step can be sufficiently confirmed.

The data acquisition is accomplished by acquiring the data using the sensors mounted on the hydraulic line, amplifying it with an amplifier, and transmitting it to the computer through an A / D converter. In the computer, data obtained on a graphic screen configured in C-language is represented as a digital value, and at the same time, it is displayed as a graph and it is judged whether or not each step is passed. This method is very reliable because it can process data at high speed and much more than PLC because it can process data in real time.

A warning signal is imposed on the high temperature oil of the present invention, the clogging of the filter, the abnormal speed of the motor, and the undefined clamp. The alert control structure 400 is similar to the fifth aspect. (106) of each DI / O of the set warning condition, detects an abnormality of the device, and informs the user of the abnormality using a buzzer or warning lamps (401, 402, ..., 40n).

The determination is made such that the pressure, the flow rate, the noise, the efficiency, and the like are determined for each stage, and finally, whether the pump is passed or not is determined, and if the inputted data falls within the acceptable range, the acceptance is determined. In order to ensure the accuracy and reliability of the judgment, the data at the time of judgment is subjected to statistical processing.

The feature of the present invention is that the self-diagnosis can be performed, so whether the signal of the valve and the sensor can be outputted well is checked through the DI / O to check whether the valve or sensor is operating correctly.

In the hydraulic pump performance tester according to the present invention, it is necessary for the user to determine the yield to be tested and to modify the relief valve and program accordingly. In order to make it more convenient and accurate, a separate correction program processed by a graphic is constructed and a value is inputted according to the instruction of the program.

Therefore, in the hydraulic pump performance tester according to the present invention, all the control computers are responsible for the speed control of the motor, the sequence control of the valve, the warning control, the judgment control, the self diagnosis control, the correction control, By integrating and controlling them through one control program, it is possible to control more finely than in the case of using a conventional PLC because it has a large memory with a small volume compared to a PLC. In addition, since the execution speed is much faster than that of PLC, many real time I / O contacts and step control are possible. In addition, real time graphic processing is possible.

In addition, it is possible to easily change various conditions through modification of the user's program, thus enabling a more flexible performance test.

Claims (11)

computer; An A / D converter, connected to the computer, for converting a physical quantity from a plurality of measurement means into a digital value; A plurality of measuring means connected to said A / D converter for measuring various physical quantities of operating oil; Motor speed control means connected to the computer for controlling a speed of the motor in accordance with setting conditions from the computer; Valve sequence control means connected to said computer for sequentially opening and closing valves by ON / OFF sequence control; And a warning control unit connected to the computer, for detecting an abnormality of the device according to a warning condition and informing the user of the abnormality. The motor control apparatus according to claim 1, wherein the motor speed control means comprises: the computer; A servo mechanism connected to the motor; A DI / O connected to the computer; A speed setting resistor connected between the DI / O and the servo mechanism; A D / A converter, an RS-232C connected between the computer and the servo mechanism, And a timer connected to the computer, wherein the feedback control is performed by rotating the motor at a speed set at each test stage, and maintaining the same speed for a predetermined time with the timer and the RS-232C. Hydraulic pump performance tester. 2. The control apparatus according to claim 1, wherein the valve sequence control means comprises: the computer; A DI / O and a timer respectively connected to the computer; And a relay connected to the DI / O and the plurality of valves, wherein the signal is received through the DI / O to control the plurality of valves by an ON / OFF sequence, and the signals are sequentially And the valve is opened and closed by the hydraulic pump. 4. The hydraulic pump performance tester according to claim 3, wherein an ON / OFF hold time is freely set through the timer to ensure a time for accurate measurement. The apparatus according to claim 1, wherein the warning control means comprises: the computer; And a DI / O connected between the computer and a plurality of lamps or alarms, wherein a term such as a high temperature oil temperature exceeding, a filter clogging, an abnormality of a motor, an uncertainty of a clamp, And a warning signal is sent to the hydraulic pump. 2. The method according to claim 1, wherein data of pressure, flow rate, noise, temperature and the like are acquired for each test step through the plurality of measurement means, and when the inputted data is in the acceptance range And judging whether or not the pump is finally passed after judging that the pump is acceptable and judging each condition of the pump and making a static determination at the same time. The hydraulic pump performance tester according to claim 6, wherein accuracy of determination and reliability are improved by receiving a large amount of measurement data in real time through the plurality of measurement means and the A / D converter. 7. The hydraulic pump performance tester according to claim 6, wherein the data obtained at the time of determination is subjected to statistical processing to determine the accuracy and reliability of the determination. The hydraulic pump performance tester according to claim 1, further comprising a calibration program for freely setting a pressure and a test condition of the relief valve. The hydraulic pump performance tester according to claim 1, further comprising self-diagnosis means for self-diagnosing abnormality of signal output of the valve and the plurality of measurement means. The hydraulic pump performance tester according to claim 1, further comprising a graphic screen capable of simultaneously observing changes in the pressure, flow rate, and noise of the pump at the same time as the test, so that the determination of the pump can be easily recognized.