Under What Background Was The Dowty Retarder Developed?

The dowty retarder was first invented by the British and used in the hump speed regulation system of railway marshalling stations. The research center of dowty retarder speed regulation system of Harbin Railway Administration was the first to produce retarders in China, which was established in the 1970s according to the order of the Ministry of Railways.

R&D background

The earliest research on dowty retarder in the world was conducted by British Doughty Hydraulic Equipment Co., Ltd. After the successful development of Doughty retarder Japan, Canada and other countries have successively developed some speed regulating equipment suitable for their own railways according to their own national conditions and road conditions. The first dowty retarder in China was successfully developed in Harbin in 1974, which opened up a new way for the speed regulation technology automation of shunting operation in China's railway marshalling station. Entering the 21st century, the research and application of dowty retarder and speed regulation technology in China have developed at a higher starting point, and entered a relatively stable development stage. Some technologies have reached the world's leading level. The wide application of dowty retarder and speed regulation technology has completely eliminated the iron shoes in the marshalling station, greatly reduced the shunting operation accidents, reduced the labor intensity of shunting operators, improved the marshalling station's unmarshalling ability and operation efficiency, created economic and social benefits, and installed and applied more than 1 million dowty retarder in the whole road.

The speed regulating system of retarder is a continuous speed regulating system composed of multiple retarders. Although each dowty retarder is an independent working unit, the final speed regulating effect depends on the system capacity of each dowty retarder group. Therefore, the maintenance and repair of dowty retarder becomes an important work of the marshalling station.

Since the use of the dowty retarder, there is no effective method to accurately detect the performance indicators of the dowty retarder. The vast majority of dowty retarder maintenance adopts a combination of outdoor inspection, outdoor maintenance and indoor maintenance. In the maintenance work, the daily inspection of dowty retarder accounts for a large proportion. The daily inspection of dowty retarder installed in the marshalling yard accounts for an average of about 60% of the maintenance work, which is time-consuming and laborious. The maintenance personnel generally use manual inspection to visually check whether the external structure is damaged, leaking, etc, Whether the dowty retarder works and whether the braking performance is good or not can only be judged by stepping on the dowty retarder one by one. Moreover, due to inadequate inspection of human factors, shunting accidents are easily caused. Although some dowty retarder in many marshalling yards are not in maintenance period, the braking function is significantly reduced. The critical speed changes so that there are frequent accidents of overspeed coupling and vehicle damage. However, it is impossible to accurately detect these non working dowty retarder among thousands of retarders. With the extension of the use time of the dowty retarder, the performance of the equipment continues to decline. The application quality is declining. This problem is becoming more and more prominent, becoming a hidden danger of shunting operation and personal safety in the marshalling yard.

Based on the above reasons, we need to develop intelligent self inspection performance dowty retarder, so that it can accurately detect whether the dowty retarder installed on the line is working, timely find unqualified dowty retarder, timely replace them, eliminate potential accidents, and ensure the safety of railway transportation production.

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