JP4010087B2 - Axis compensator for test equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic correction device for a test instrument shaft.
[0002]
[Prior art]
There is an environmental test as one method for testing a rotating body using a dynamometer which is a test device. In that case, for the purpose of reducing the cost of the test equipment, a specimen (rotating body) which is a device under test is placed in an environmental tank, and test equipment such as a dynamometer is installed outside the environmental tank. FIG. 5 shows the test equipment, wherein 1 is a bed, 2 is an environmental tank, and is composed of a sealed structure so as to simulate environmental changes such as temperature. 3 is a dynamometer, 4 is a pedestal, 5 is a rotating shaft, one end of the rotating shaft 5 penetrates the side wall of the environmental tank 2 and protrudes into the environmental tank 2, and the other end is dynamometer via the pedestal 4. 3 is directly connected to the shaft. Reference numeral 7 denotes a pedestal provided in the environmental tank 2 on which the rotating shaft 8 is supported. 6 is a specimen and is connected to the rotating shafts 5 and 8.
[0003]
[Problems to be solved by the invention]
In order to test the specimen 6, the shafts C of the rotary shafts 5 and 8 are installed so as to coincide with each other, so that the test is started with the same height A and B of each shaft and the bed 1. . However, when the test is started with the temperature in the environmental tank 2 raised, the same height cannot be maintained due to the temperature difference between the outside temperature on the dynamometer 3 side and the environment tank 2, and there is an error in the height of both. appear. For this reason, the vibration in the pedestal 4 or 7 is generated and gradually increases, and if the use is continued in that state, there is a possibility that abnormal friction occurs in the bearing in the pedestal, leading to damage to the pedestal. . Therefore, conventionally, the temperature setting of the environmental tank 2 has a problem that the upper limit setting is determined by the outside air temperature.
[0004]
An object of the present invention is to provide an apparatus capable of automatically adjusting the axis of a rotating shaft so as not to be affected by the outside air temperature in the test facility as described above.
[0005]
[Means for Solving the Problems]
The present invention is supported by a rotating shaft supported by a second pedestal disposed in the environmental tank and a first pedestal disposed outside the environmental tank, one end of which protrudes into the environmental tank through the side wall. In testing a specimen connected to a rotating shaft,
A heater is attached to each of the pedestals, and a sensor is provided for each of the rotating shafts in the environmental tank to detect axial fluctuations. The heater of the pedestal is controlled based on a signal detected by the sensor. A temperature control unit is provided.
[0006]
According to a second aspect of the present invention, the temperature control unit includes a switching unit that compares signals detected by the sensors and switches and controls the heater of the pedestal by comparing the magnitude results of the signals.
[0007]
The third aspect of the present invention is a rotary shaft supported by a second pedestal disposed in the environmental tank and a first pedestal disposed outside the environmental tank, one end of which penetrates the side wall and passes through the side wall. In testing a specimen connected to a rotating shaft protruding into
A heater is attached to each of the pedestals, and a temperature detector is provided in each of the first and second pedestals, and the heaters of the pedestal are installed on the basis of signals detected by the temperature detectors. A temperature control unit to be controlled is provided.
[0008]
A fourth aspect of the present invention is a temperature comparison detection unit that compares the detected temperature signals inside and outside the environmental tank to the temperature control unit and issues an output signal for selecting the first or second of the pedestal, A temperature-strain amount conversion unit that individually introduces detected temperature signals inside and outside the environmental tank and converts them into strain amounts corresponding to the temperature signals, and generates a strain amount deviation signal between each conversion unit, Strain amount that individually introduces the deviation signal and converts the correction strain amount to the correction temperature signal, the temperature conversion unit, and the lower temperature detection signal and the strain amount among the temperature signals inside and outside the environmental tank The correction signal output from the temperature conversion unit is added and input to one terminal as a setting signal, and the lower temperature detection signal of the first and second pedestals is input to the other terminal. Pedestal on the low temperature signal side according to the difference signal of both signals It is obtained and a control unit for controlling the Le heater.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a configuration diagram showing an embodiment of the present invention. Reference numeral 10 denotes a first pedestal disposed outside the environmental tank. The pedestal 10 is configured so that a heater (not shown) is embedded and temperature control is possible. Reference numeral 11 denotes a heat insulating material provided to prevent heat conduction between the bed 1 and the pedestal 10. 13 is the 2nd pedestal arrange | positioned in the environmental tank 2, The heater is embedded like the 1st pedestal 10, and temperature control is possible. 14 is a thermal insulating material, D1 and D2 are distance sensors, the distance sensor D1 measures the distance A1 between the rotating shaft 5 and the bed 1, and the distance sensor D2 measures the distance B1 between the rotating shaft 8 and the bed 1. . Others are the same as the conventional one shown in FIG.
FIG. 2 is a configuration diagram of the temperature control unit 20, and controls the heaters of the pedestals 10 and 13 based on signals detected by the distance sensors D1 and D2. In the figure, reference numeral 21 denotes a distance comparison detection unit, and S1, S2 and S3 are changeover switches, which are switched by the output of the comparison detection unit 21. A control unit 22 performs PI calculation.
[0010]
Next, the operation will be described. For example, when the test of the specimen 6 is performed with the temperature in the environmental tank 2 higher than the outside air temperature, the temperature of the pedestal 13 in the environmental tank 2 is also the same as that of the pedestal 10. As a result, the temperature becomes higher and a thermal expansion phenomenon occurs, so that the axis of the rotary shaft 8 deviates from C. The distance sensors D1 and D2 detect the distances A1 and B1 and input the detection signals to the comparison detection unit 21. The comparison detection unit 21 compares the distance signals corresponding to the distances A1 and B1 and, as a result, outputs a switching signal to the switches S1, S2 and S3 when a difference signal of a certain value or more is generated between them. Switch the switch. Here, since A1 <B1 with the environmental tank high temperature, each switch is switched from the contact b (shown state) to the contact a side. The signal B1 from the distance sensor D2 is input as a target value (distance setting value) to one input terminal of the control unit 22 via the contact a of the switch S1, and the contact of the switch S2 is input to the other input terminal. The signal A1 from the distance sensor D1 is input as a distance detection via a, a signal corresponding to the difference signal is output, the heater of the pedestal 10 is controlled through the contact a of the switch S3, and the pedestal temperature is adjusted and rotated. Control is performed so that the axis of the shaft 5 is aligned with the axis of the rotary shaft 8. When the distance signal A1> B1, the pedestal side opposite to the above description is controlled. That is, the positions of the left and right rotating shafts connected to the specimen 6 (distance from the bed) are detected, the longer distance is set, the shorter distance is detected, PI control is performed, and the shorter distance heater By adjusting the temperature, the temperature adjustment is adjusted to the axis with the longer distance (the axis that has shifted).
[0011]
FIG. 3 shows another embodiment. In this embodiment, temperature detectors T1 to T4 are provided in place of the distance sensor shown in FIG. That is, T1 is a detector that detects the temperature of the bed 1 that is common to each pedestal outside the environmental tank, T2 is a detector that detects the temperature in the environmental tank 2, and T3 is a second pedestal. A detector T <b> 13 for detecting the temperature of T <b> 4 is a detector for detecting the temperature of the first pedestal 10. Others are the same as FIG.
[0012]
FIG. 4 shows a configuration diagram of the temperature control unit in FIG. In the figure, reference numeral 31 denotes a temperature comparison / detection unit which receives and compares the temperature signal of the bed 1 detected by the temperature detector T1 and the temperature signal in the environmental tank 2 detected by the temperature detector T2. As a result of the comparison, a temperature difference of a certain value or more is generated between T1 and T2, for example, a detection signal is generated when T1 <T2, and the contacts of the changeover switches S11 to S15 are switched. 32 is a temperature-strain amount conversion unit for the rotary shaft 5 (point A), 33 is a temperature-strain amount conversion unit for the rotary shaft 13 (point B), and the conversion units 32 and 33 are data based on experiments in advance. Recorded and graphed. Reference numeral 34 denotes an absolute value conversion unit, 35 denotes a strain amount-temperature conversion unit for the rotary shaft 5 (point A), and 36 denotes a strain amount-temperature conversion unit for the rotary shaft 13 (point B). The temperature characteristics due to changes in the data are used as data. A control unit 37 controls the heater temperature.
[0013]
In what is configured as described above, it is assumed that the test of the specimen 6 is performed with the temperature in the environmental tank 2 higher than the outside air temperature. The temperature signal of the bed 1 (outside the environmental tank) and the temperature signal in the environmental tank 2 detected by the temperature detectors T1 and T2 are input to the temperature-strain amount conversion units 32 and 33, respectively, and the strain amount with respect to the temperature change. And applied to the adders Ad1 and Ad2. In the adder Ad1, the output of the converter 32 is positive and the output of the converter 33 is negative to generate a deviation between them. In the adder Ad2, the output of the converter 33 is positive and the output of the converter 32 is negative. A deviation signal is generated. On the other hand, the detection signals of the temperature detectors T1 and T2 are also input to the temperature comparison / detection unit 31 for temperature comparison, and when T1 <T2, a signal is output to connect the contacts of the changeover switches S11 to S15 to b. Switch from side to side. By switching the switch S13, the deviation signal from the addition unit Ad2 passes through the absolute value conversion unit 34 and is input to the distortion amount-temperature conversion unit 35 as a correction distortion amount due to a temperature difference, and is corrected from the correction distortion amount here. Temperature is required. This correction amount is applied to the adder Ad3 via the switch S14. The temperature signal of the bed 1 is applied to the adding unit Ad3 via the switch S11, and both signals are added with the same polarity and input to one terminal of the control unit 37 as a setting signal for temperature adjustment. . In addition, the temperature signal of the pedestal 10 is input to the other terminal of the control unit 37 as a detection signal via the switch S12. The control unit 37 controls the heater of the pedestal 10 via the switch S15 in such a direction that the difference between both signals disappears, and misalignment between the rotating shafts 5 and 8 based on the temperature difference between the pedestals 10 and 13 is prevented.
[0014]
【The invention's effect】
As described above, when the present invention is tested by connecting the rotating body, which is a specimen installed inside the environmental tank, with the rotating shaft inside the environmental tank and the rotating shaft protruding into the environmental tank from the outside, In order to prevent shaft misalignment based on the temperature difference between the inside and outside of the tank, the strain of the rotating shaft connected to the rotating body is measured, and the temperature of the pedestal that supports the rotating shaft is controlled according to the amount of strain. Alternatively, the amount of strain is estimated from the temperature difference between the inside and outside of the environmental tank, and the temperature of the pedestal is adjusted. Therefore, according to the present invention, it is possible to prevent the test equipment from being damaged due to the occurrence of the axial deviation of the rotating body.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of the present invention.
FIG. 2 is a circuit diagram of a temperature control unit used in the present invention.
FIG. 3 is a configuration diagram showing a second embodiment of the present invention.
FIG. 4 is a circuit diagram used in a second embodiment of the present invention.
FIG. 5 is a configuration diagram of a conventional test facility using an environmental tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Bed 2 ... Environmental tank 3 ... Dynamometer 4, 7, 10, 13 ... Pedestal 5, 8 ... Rotating shaft 6 ... Specimen 20,30 ... Temperature control part D1, D2 ... Distance sensor T1-T4 ... Temperature detector DESCRIPTION OF SYMBOLS 21 ... Comparison detector 31 ... Temperature comparison detector 22, 37 ... Control part 32, 33 ... Temperature-strain amount conversion part 35, 36 ... Strain amount-temperature conversion part

Claims (4)

A rotating shaft supported by a second pedestal disposed in the environmental tank, and a rotating shaft supported by the first pedestal disposed outside the environmental tank, one end of which passes through the side wall and protrudes into the environmental tank. For testing specimens connected to
A heater is attached to each of the pedestals, and a sensor is provided for each of the rotating shafts in the environmental tank to detect axial fluctuations. The heater of the pedestal is controlled based on a signal detected by the sensor. An axis correction apparatus for test equipment, characterized in that a temperature control unit is provided. The test apparatus according to claim 1, wherein the temperature control unit includes a switching unit that compares signals detected by the sensors and controls switching of the heater of the pedestal by comparing the magnitude results of the signals. Axis correction device. A rotating shaft supported by a second pedestal disposed in the environmental tank, and a rotating shaft supported by the first pedestal disposed outside the environmental tank, one end of which passes through the side wall and protrudes into the environmental tank. For testing specimens connected to
A heater is attached to each of the pedestals, and a temperature detector is provided in each of the first and second pedestals, and the heaters of the pedestal are installed on the basis of signals detected by the temperature detectors. An axis correction apparatus for test equipment, characterized in that a temperature control unit for controlling is provided. The temperature control unit compares the detected temperature signals inside and outside the environmental tank, and outputs an output signal for selecting the first or second of the pedestal, and the internal and external detection of the environmental tank A temperature-strain amount conversion unit that individually introduces a temperature signal and converts it into a strain amount corresponding to the temperature signal, and a distortion amount deviation signal between each conversion unit are generated, and each deviation signal is individually introduced. Output from the distortion amount-temperature conversion section for converting the correction distortion amount to the correction temperature signal, and the lower temperature detection signal and the distortion amount-temperature conversion section among the internal and external temperature signals of the environmental tank. The correction signal is added to be input to one terminal as a setting signal, and the lower temperature detection signal of the first and second pedestals is input to the other terminal. The pedestal heater on the low temperature signal side is controlled accordingly. Features and claims 3 axis testing apparatus according correcting device further comprising a control section for.

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