Shanghai Metrology Institute develops "wheel wheel diameter detection device"

[ Instrument Network Instrument R & D ] The Shanghai Metro was formally operated in the early 1990s. It is the third urban rail transit system constructed in mainland China following the completion of the Beijing and Tianjin subways. As of December 2018, the Shanghai Metro has a total of 16 operating lines, with a total of 415 stations (including 2 maglev lines) and a total operating mileage of 705 kilometers (including 29 kilometers of maglev lines), making it the busiest city in the world. one.

At present, Shanghai is in a critical period of resumption of work and production. Rail transportation is an important means of transportation for citizens, and its safe and stable operation is the key to ensuring the full restoration of production and living order. Urban rail transit is an important part of urban public transportation. Wheels are the key components to ensure the safe operation of rail trains, and they must maintain a good technical condition. The subway company will regularly check the wheels, track and analyze the relevant data of the wheels, and judge whether to turn the wheels.

In addition, the curve geometric parameters of wheel turning are derived from the settings of wheel turning machines, and the reliability of wheel turning machining depends on the correctness of the geometric parameters of the standard wheel set of its accessories. It can be said that the standard wheel set is the benchmark for the geometric parameters of subway wheels. It is reported that the wheel diameter is measured by a wheel outside diameter measuring instrument. The measuring instrument uses the bowstring height principle to perform indirect measurement. Because it is an indirect measurement and uses a dial to read the display value, and human factors will be introduced during the measurement, the accuracy cannot meet the measurement requirements.

Therefore, in order to ensure the safety of public transportation in Shanghai, recently, Shanghai Metrology Institute has developed a device for on-site detection of wheel diameter of rail transit wheels. The technical level of the Shanghai Metrology Institute in the field of rail transit detection has been improved, which will help to better serve the city's rail transit system and meet the needs for metro parameter measurement of standard subway wheels.

Engineers of Shanghai Metrology Institute found that during the testing of subway standard wheel sets, samples are often scattered in various maintenance bases of subway companies, which are large, heavy and inconvenient to transport, and are not suitable for routine delivery to laboratories for testing. After in-depth research and discussion, engineers from Shanghai Metrology Institute designed a set of on-site testing devices to successfully solve the on-site testing problems of standard wheelset geometric parameters. Compared with the traditional detection method, the device reduces the number of measuring tools, improves the detection efficiency, greatly reduces the work intensity and improves the measurement accuracy (equipment measurement accuracy can reach 0.03mm, which is better than the high-speed rail 0.15mm technical requirements).