CN212083290U - Measuring device for testing linear expansion coefficient of steel-aluminum composite conductor rail - Google Patents
Measuring device for testing linear expansion coefficient of steel-aluminum composite conductor rail Download PDFInfo
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- CN212083290U CN212083290U CN202020479248.1U CN202020479248U CN212083290U CN 212083290 U CN212083290 U CN 212083290U CN 202020479248 U CN202020479248 U CN 202020479248U CN 212083290 U CN212083290 U CN 212083290U
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Abstract
A measuring device for testing the linear expansion coefficient of a steel-aluminum composite conductor rail. Belonging to the urban rail transit field. The method comprises the following steps of putting a tested composite rail sample into a thermostat, arranging a first high-temperature-resistant eddy current type displacement sensor and a second high-temperature-resistant eddy current type displacement sensor at two ends of the tested composite rail sample respectively, arranging a thermocouple on the tested composite rail sample, and connecting the first high-temperature-resistant eddy current type displacement sensor, the second high-temperature-resistant eddy current type displacement sensor and the thermocouple to a computer after passing through a data acquisition device. The device is simple and convenient to operate, high in measurement accuracy and safe. In the test process, only one tester is needed to operate the notebook computer. After the constant temperature box is automatically heated to the set temperature, the device automatically completes the measurement task and directly displays the temperature, the length, the time parameter curve and the linear expansion coefficient value on the notebook computer.
Description
Technical Field
The utility model relates to a carry out measuring device of compound conductor rail linear expansion coefficient inspection of steel aluminium. Belonging to the urban rail transit field. The device is used for testing the linear expansion coefficient of the steel-aluminum composite conductor rail.
Background
According to the standards of CJ/T414-2012 'technical requirements for steel-aluminum composite conductor rails for urban rail transit', the steel-aluminum composite conductor rails (hereinafter referred to as 'composite rails') adopted in the field of urban rail transit are subjected to linear expansion coefficient inspection. The composite rail is a conductive device for urban rail transit, and is a whole formed by compounding a stainless steel band of a contact surface and an aluminum alloy profile of a rail body. Due to the fact that the physical material characteristics of the metal materials steel and aluminum are different, the expansion coefficients of the materials are different at different temperatures, the situation that the steel and the aluminum slide relatively at different temperatures of products is likely to occur, and hidden dangers are brought to quality safety of the products. This is the significance of the composite trajectory coefficient of expansion test.
The method for testing the linear expansion coefficient is specified in CJ/T414-:
taking a 1m composite rail (two ends are required to be flat when being cut), measuring the length of the rail by using a vernier caliper at room temperature, recording an environmental temperature value, completely putting the rail into 100 ℃ constant temperature equipment for keeping for 1.5h, taking out and measuring the length of the rail and the temperature on the rail, and calculating a linear expansion coefficient according to the following formula:
in the formula:
l1the length of the rail is long after temperature rise; l0Rail length at room temperature; t is1Is the temperature value after temperature rise; t is0Is the room temperature value.
The problem that this measuring device will solve is:
the original test method comprises the following steps: at room temperature, measuring the length value of the tested composite rail sample and the temperature value at the corresponding moment by using a vernier caliper with the measuring range of 1 m; and then placing the sample into a thermostat, keeping the temperature at 100 ℃ for 1.5h, immediately taking out the sample, and measuring the length value and the temperature value of the sample by using a vernier caliper. The linear expansion coefficient is obtained by using the formula (1). The problems with this test method are: (1) the deviation of the measured data from the true value is large. Because the used measuring tool is a vernier caliper with the measuring range of 1m, and the length variation of the sample from room temperature to high temperature is very small, the personnel have slight deviation in the measurement, and the measuring result is greatly influenced; in the test process of taking out the sample immediately at a high temperature of 100 ℃ to measure the length, the temperature drops quickly, and when the length value is measured, the temperature of the corresponding moment is still 100 ℃ difficultly guaranteed. (2) The test process has great potential safety hazard. In the test process of taking out the sample immediately at high temperature of 100 ℃ to measure the length, the risk of scalding personnel in the measurement process is large.
Disclosure of Invention
The tested composite rail sample is placed in the thermostat, a first high-temperature-resistant eddy current type displacement sensor and a second high-temperature-resistant eddy current type displacement sensor are arranged at two ends of the tested composite rail sample respectively, a thermocouple is arranged on the tested composite rail sample, and the first high-temperature-resistant eddy current type displacement sensor, the second high-temperature-resistant eddy current type displacement sensor and the thermocouple are connected to a computer after passing through the data acquisition device.
Furthermore, three thermocouples are arranged on the tested composite rail sample.
And (4) placing the tested composite rail sample into a thermostat, and loading the corresponding temperature and keeping the temperature stable. The method comprises the steps of measuring the length values of a sample at room temperature and high temperature respectively by using a high-temperature-resistant vortex displacement sensor, measuring the actual temperature of the sample by using a thermocouple, obtaining the length and temperature data by using a data acquisition device, displaying real-time curves of the length and the temperature on a notebook computer after communication, obtaining the linear expansion coefficient value by using a formula (1), and displaying the linear expansion coefficient value on a screen.
The device realizes the functional advantages that: (1) the operation is simple. In the test process, only one tester is needed to operate the notebook computer. After the constant temperature box is automatically heated to the set temperature, the device automatically completes the measurement task and directly displays the temperature, the length, the time parameter curve and the linear expansion coefficient value on the notebook computer. (2) The measurement precision is high. The precision of the high-temperature resistant vortex displacement sensor used by the device is 1.5 mu m, the temperature measurement at the corresponding moment is a real-time value, and the measurement result is accurate; in the original scheme, the precision of the vernier caliper is 0.02mm, and in the test process of taking out a sample immediately at a high temperature of 100 ℃ to measure the length, the temperature drops quickly, and the precision of a measurement result is poor. (3) And (4) safety. In the test process, no personnel need to contact the high-temperature sample.
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Fig. 1 is a schematic structural diagram of the device.
Detailed Description
The working process of the device is as follows: and (3) placing the tested composite rail sample 2 into the constant temperature box 1, and loading the corresponding temperature and keeping the temperature stable. The length values of the sample at room temperature and at high temperature are measured using the high temperature resistant eddy current type displacement sensors 3, 4, and three thermocouples 5, 6, 7 are used to measure the actual temperature of the sample (for the sake of representation, three typical positions of the left, middle, and right sides are selected, but the difference of the three thermocouples is within 1 ℃, preferably within ± 0.3 ℃, so that the average of the three thermocouples is taken as the effective temperature, and one thermocouple is also possible if not strictly). The above length and temperature data are obtained by the data acquisition device 8. The temperature, length, time parameter curves and linear expansion coefficient values are directly displayed on the notebook computer 9.
In fact, in the process from room temperature to high temperature, the length direction of the rail expands simultaneously, so that the first high-temperature-resistant eddy current type displacement sensor 3 and the second high-temperature-resistant eddy current type displacement sensor 4 in the figure must be measured simultaneously, and the length value at the corresponding temperature can be obtained through calculation.
Claims (2)
1. The utility model provides a carry out measuring device of compound conductor rail linear expansion coefficient inspection of steel aluminium which characterized in that:
the tested composite rail sample is placed in the thermostat, a first high-temperature-resistant eddy current type displacement sensor and a second high-temperature-resistant eddy current type displacement sensor are arranged at two ends of the tested composite rail sample respectively, a thermocouple is arranged on the tested composite rail sample, and the first high-temperature-resistant eddy current type displacement sensor, the second high-temperature-resistant eddy current type displacement sensor and the thermocouple are connected to a computer after passing through the data acquisition device.
2. The utility model provides a carry out measuring device of compound conductor rail linear expansion coefficient inspection of steel aluminium which characterized in that:
three thermocouples are arranged on the tested composite rail sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020479248.1U CN212083290U (en) | 2020-04-03 | 2020-04-03 | Measuring device for testing linear expansion coefficient of steel-aluminum composite conductor rail |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020479248.1U CN212083290U (en) | 2020-04-03 | 2020-04-03 | Measuring device for testing linear expansion coefficient of steel-aluminum composite conductor rail |
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| CN212083290U true CN212083290U (en) | 2020-12-04 |
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| CN202020479248.1U Active CN212083290U (en) | 2020-04-03 | 2020-04-03 | Measuring device for testing linear expansion coefficient of steel-aluminum composite conductor rail |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514539A (en) * | 2021-04-12 | 2021-10-19 | 爱德森（厦门）电子有限公司 | Method and device for detecting temperature resistance and relative expansion coefficient of metal surface coating |
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2020
- 2020-04-03 CN CN202020479248.1U patent/CN212083290U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514539A (en) * | 2021-04-12 | 2021-10-19 | 爱德森（厦门）电子有限公司 | Method and device for detecting temperature resistance and relative expansion coefficient of metal surface coating |
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| TR01 | Transfer of patent right |
Effective date of registration: 20220104 Address after: 100081 Beijing city Haidian District Daliushu Road No. 2 Patentee after: CHINA RAILWAY TEST & CERTIFICATION CENTER Co.,Ltd. Patentee after: China Railway Research Institute Group Co., Ltd Address before: 100081 Beijing city Haidian District Daliushu Road No. 2 Patentee before: CHINA RAILWAY TEST & CERTIFICATION CENTER Co.,Ltd. |