JP2001221717A - Shaft correcting device for testing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft correcting device preventing distortion of rotating shafts due to a temperature difference between the inside and outside of an environmental vessel when a test is conducted while a sample installed within the environmental vessel is connected to one of the rotating shafts located inside the environmental vessel and to the other rotating shaft projecting into the environmental vessel from the outside. SOLUTION: The amounts of distortion of the rotating shafts located inside and outside the environmental vessel and connected to the sample are measured, and the temperatures of pedestals bearing the rotating shafts are adjusted according to the amounts of distortion. Temperatures inside and outside the environmental vessel are measured and the amounts of distortion are estimated from the difference between the temperatures to control the temperatures of the pedestals so as to prevent misalignment of the shafts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically correcting axes for test equipment.

[0002]

2. Description of the Related Art There is an environmental test as one method of testing a rotating body using a dynamometer which is a test device. In this case, a test object (rotating body), which is a device under test, is placed in an environmental tank for the purpose of reducing test equipment costs, and test equipment such as a dynamometer is installed outside the environmental tank. FIG. 5 shows the test equipment. Reference numeral 1 denotes a bed, and reference numeral 2 denotes an environmental tank, which is formed of a closed structure and configured to simulate environmental changes such as temperature. 3 is a dynamometer, 4 is a pedestal,
Reference numeral 5 denotes 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 directly connected to a shaft of the dynamometer 3 via a pedestal 4. Reference numeral 7 denotes a pedestal provided in the environmental tank 2 and supports a rotating shaft 8. Reference numeral 6 denotes a specimen which is connected to the rotating shafts 5 and 8.

[0003]

In testing the specimen 6, since the axes C of the rotating shafts 5 and 8 are set so as to coincide with each other, the heights A and B of each shaft and the bed 1 are set. The test is started at the same time. However, when the test is started by increasing the temperature in the environmental chamber 2, the same height cannot be maintained due to the temperature difference between the external temperature on the dynamometer 3 side and the temperature in the environmental chamber 2, and an error is caused in both heights. appear. For this reason, the vibration in the pedestal 4 or 7 is generated and gradually increases, and if the pedestal 4 is used continuously in this state, abnormal friction occurs in the bearings in the pedestal, and the pedestal may be damaged. . Therefore, conventionally, there has been a problem that the upper limit setting of the temperature setting of the environmental bath 2 is determined by the outside air temperature.

An object of the present invention is to provide an apparatus which can automatically adjust the axis of a rotating shaft in the above-mentioned test facility so as not to be affected by the outside air temperature.

[0005]

According to the present invention, there is provided a rotary shaft supported by a second pedestal disposed in an environmental chamber, and a first pedestal disposed outside the environmental chamber, and one end of which has a side wall. In testing a specimen connected to a rotating shaft that penetrates and protrudes into an environmental chamber, a heater is attached to each of the pedestals, and shaft center fluctuations are separately detected for each rotating axis in the environmental chamber. And a temperature controller for controlling the heater of the pedestal based on a signal detected by the sensor.

A second aspect of the present invention is that the temperature control section includes:
A switching unit that compares signals detected by the sensors and switches and controls the heater of the pedestal based on a comparison between the magnitudes of the signals.

A third aspect of the present invention is a second aspect of the present invention, wherein the second
A test specimen connected to a rotating shaft supported by the pedestal of the first embodiment and a rotating shaft supported by a first pedestal arranged outside the environmental chamber and having one end penetrating the side wall and projecting into the environmental chamber is tested. In addition to the above, a heater is attached to each of the pedestals, and a temperature detector is provided inside and outside of the environmental tank, and each of the first and second pedestals, and based on a signal detected by the temperature detector, A temperature controller for controlling the heater of the pedestal is provided.

A fourth aspect of the present invention is that the temperature control section compares the detected temperature signals inside and outside the environmental tank and outputs an output signal for selecting the first or second pedestal. Unit, a temperature-strain converter that separately introduces the detected temperature signals inside and outside the environmental bath and converts them into distortions corresponding to the temperature signals, and generates a deviation signal of the distortion between the conversion units. Then, each deviation signal is separately introduced, a distortion amount-temperature conversion unit that converts the correction distortion amount into a correction temperature signal, and a lower temperature detection signal among the temperature signals inside and outside the environment tank. The distortion signal and the correction signal output from the temperature conversion unit are added and input to one terminal as a setting signal,
The other terminal receives the lower temperature detection signal of the first and second pedestals, and controls a heater of the pedestal on the lower temperature signal side according to a difference signal between the two signals. It is provided.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 10 denotes a first pedestal provided outside the environmental tank, and the pedestal 10 is configured such that a heater (not shown) is embedded so that temperature control is possible. 11 is a heat insulating material, and the bed 1 and the pedestal 10
Is provided so as to prevent heat conduction between them. Reference numeral 13 denotes a second pedestal disposed in the environment tank 2 and has a heater embedded therein as in the first pedestal 10 so that temperature control is possible. 14 is a heat insulating material, D1 and D2 are distance sensors, respectively. 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. . The other parts are the same as the conventional one shown in FIG. FIG.
Is a configuration diagram of the temperature control unit 20, and distance sensors D1, D2
Pedestal 10,1 based on the signal detected by
3 is controlled. In the figure, reference numeral 21 denotes a distance comparison and detection unit, and S1, S2, and S3 are changeover switches, which are switched by the output of the comparison and detection unit 21. A control unit 22 performs a PI operation.

Next, the operation will be described. For example, assuming that the test of the specimen 6 is performed with the temperature in the environmental chamber 2 higher than the outside air temperature, the temperature of the pedestal 13 in the environmental chamber 2 is also reduced. It becomes higher than the pedestal 10 and a thermal expansion phenomenon occurs, and the axis of the rotating shaft 8 is shifted 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. Comparison detection unit 21
Compares the distance signals corresponding to the distances A1 and B1, and outputs a switch signal to the switches S1, S2, and S3 when a difference signal having a certain value or more is generated between the two as a result. Switch. Here, since A1 <B1 in accordance with the high temperature of the environmental bath, each switch is switched from the contact b (shown) to the contact a. A signal B1 from the distance sensor D2 is input to one input terminal of the control unit 22 via a contact a of the switch S1 as a target value (distance set value), and a 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, and 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 to adjust the pedestal temperature, Control is performed so that the axis of the shaft 5 is aligned with the axis of the rotating shaft 8. In addition,
When the distance signal A1> B1, the pedestal side opposite to the above description is controlled. That is, the position of the left and right rotating shafts (distance from the bed) connected to the specimen 6 is detected, the longer distance is set, the shorter distance is detected, and PI control is performed. Is controlled so that the temperature is adjusted to the axis of the longer distance (the axis whose axis is shifted).

FIG. 3 shows another embodiment. In this embodiment, temperature detectors T1 to T4 are provided instead of the distance sensor shown in FIG. That is, T1
Is a detector for detecting the temperature of the bed 1 outside of the environmental tank, here common to each pedestal, T2 is a detector for detecting the temperature in the environmental tank 2, and T3 is a second pedestal 13
T4 detects the temperature of the first pedestal 1
It is a detector that detects the temperature of 0. Others are the same as FIG.

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 a temperature signal of the bed 1 detected by the temperature detector T1 and a temperature signal in the environment tank 2 detected by the temperature detector T2. Comparison result, T
A temperature difference equal to or more than a certain value occurs between 1 and T2, for example, T1 <
At T2, a detection signal is generated, and the changeover switches S11 to S
Fifteen contacts are switched. 32 is a temperature-strain amount converter for the rotating shaft 5 (point A), 33 is a temperature-strain amount converter for the rotating shaft 13 (point B), and the converters 32 and 33 are data based on experiments in advance. Recorded and graphed. 34
Is an absolute value converter, 35 is a distortion-temperature converter for the rotating shaft 5 (point A), 36 is a distortion-temperature converter for the rotating shaft 13 (point B), and each converter has a distortion amount. Temperature characteristics due to changes are stored as data. A control unit 37 controls the heater temperature.

In the above-described configuration, it is assumed that the test of the specimen 6 is performed by setting the temperature in the environment tank 2 higher than the outside air temperature. The temperature signals of the bed 1 (outside the environmental chamber) and the temperature signals in the environmental chamber 2 detected by the temperature detectors T1 and T2 are respectively converted into a temperature-strain amount converter 32
33, is converted into a distortion amount with respect to a temperature change, and is applied to the adders Ad1 and Ad2. In the addition unit Ad1,
The output of the conversion unit 32 is set to be positive and the output of the conversion unit 33 is set to be negative to generate a deviation between the two.
A deviation signal is generated in which the output of the converter 3 is positive and the output of the converter 32 is negative. On the other hand, the detection signals of the temperature detectors T1 and T2 are also input to the temperature comparison and detection unit 31 to be compared in temperature. When T1 <T2, a signal is output and the contacts of the changeover switches S11 to S15 are set to b. To a side. By the switching of the switch S13, the deviation signal from the adder Ad2 passes through the absolute value converter 34 to become a correction distortion amount due to a temperature difference and is input to the distortion amount-temperature conversion unit 35, where the correction is made based on the correction distortion amount. 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 addition unit Ad3 via the switch S11, and the two signals are added with the same polarity and input to one terminal of the control unit 37 as a temperature adjustment setting signal. . The temperature signal of the pedestal 10 is input to the other terminal of the control unit 37 via the switch S12 as a detection signal. The control unit 37
The heater of the pedestal 10 is controlled via the switch S15 in a direction in which the difference between the two signals disappears, and the pedestals 10 and 13 are controlled.
Misalignment between the rotating shafts 5 and 8 based on the temperature difference of the rotating shafts is prevented.

[0014]

As described above, according to the present invention, a rotating body which is a test object installed inside an environmental tank is connected with a rotating shaft inside the environmental tank and a rotating shaft projecting from the outside into the environmental tank. At the time of testing, in order to prevent shaft misalignment based on the temperature difference between the inside and outside of the environmental chamber, measure the distortion of the rotating shaft connected to the rotating body and support the rotating shaft according to the amount of distortion. The pedestal temperature is controlled by controlling the temperature of the pedestal or by estimating the amount of strain from the temperature difference between the inside and the outside of the environmental tank. Therefore, according to the present invention, it is possible to prevent the test equipment from being damaged due to the occurrence of the axis 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 test facility using a conventional environmental tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bed 2 ... Environment tank 3 ... Dynamometer 4,7,10,13 ... Pedestal 5,8 ... Rotating axis 6 ... Test specimen 20,30 ... Temperature control part D1, D2 ... Distance sensor T1-T4 ... Temperature detector 21: Comparison detector 31: Temperature comparison detector 22, 37: Control unit 32, 33: Temperature-strain amount converter 35, 36: Strain-temperature converter

Claims (4)

[Claims] 1. A rotating shaft supported by a second pedestal disposed in an environmental tank and a first pedestal disposed outside the environmental tank, one end of which projects through the side wall into the environmental tank. In testing a specimen connected to the rotating shaft, a heater is attached to each of the pedestals, and a sensor for separately detecting a shaft center variation is provided on each rotating shaft in the environmental tank. An axis correction device for test equipment, comprising: a temperature controller for controlling a heater of the pedestal based on a signal detected by a sensor. 2. The temperature control unit according to claim 1, further comprising a switching unit that compares signals detected by the sensors and controls switching of the pedestal heater based on a comparison between the magnitudes of the signals. 2. The axis correction device for test equipment according to 1. 3. A rotating shaft supported by a second pedestal disposed in the environmental chamber and a first pedestal disposed outside the environmental chamber, one end of which penetrates the side wall and protrudes into the environmental chamber. In testing the specimen connected to the rotating shaft, a heater is attached to each of the pedestals, and a temperature detector is provided inside and outside of the environmental bath and at each of the first and second pedestals. An axis correction device for test equipment, comprising: a temperature control unit that controls a heater of the pedestal based on a signal detected by a temperature detector. 4. The temperature control section includes: a temperature comparison / detection section that compares detected temperature signals inside and outside the environment tank and generates an output signal for selecting the first or second pedestal; A temperature-strain converter that separately introduces the detected temperature signals inside and outside the tank and converts them into strains corresponding to the temperature signals, and generates a deviation signal of the distortion amount between the conversion units, and generates each deviation signal. Are individually introduced and converted from the correction distortion amount to the correction temperature signal, respectively, and a temperature detection signal and a distortion amount-temperature conversion of the lower one of the temperature signals inside and outside the environmental chamber. The correction signal output from the unit is added and input to one terminal as a setting signal, and the other terminal receives the lower temperature detection signal of the first and second pedestals, The pedestal on the low temperature signal side according to the difference signal between the two signals 4. The axis correction device for test equipment according to claim 3, further comprising a control unit for controlling the heater.