Comparison of dowty retarder types

Through the analysis of several schemes, it can be seen that the above several dowty retarder can achieve the purpose of improving the structural speed of dowty retarder, each with its own advantages.

If the microcomputer controlled roof is adopted, the marshalling capacity of the head of the marshalling station will be greatly improved, but at present, the construction speed of the common dowty retarder used in the track of the marshalling station is 25km / h, which can only be pulled out under the construction speed for safety. In this way, when the train is pulled out, the occupation time of track will be prolonged, and the comprehensive use capacity of the whole marshalling station will be reduced. Moreover, the work done by the train top to the train during pulling out is idle work, which wastes the locomotive traction.

The unidirectional locking roof or slow return deceleration roof can be selected in the track, but the unidirectional locking roof is more suitable for the marshalling station with more reverse traction operation, and the construction speed of dowty retarder can only be increased in the reverse traction direction, However, although the forward pull-out has the same slow return function as the slow return retarder, the slow return function can only improve the pull-out speed of the train to a certain extent in terms of the current use, and the pull-out speed cannot be increased infinitely in the forward pull-out, For most of the marshalling and shunting lines, the problem of forward departure speed limit has not been solved, so it is the primary task to solve the capacity expansion of marshalling station to adopt the retarder which does not limit the speed of train pulling out.

The double critical speed dowty retarder solves this kind of problem. Compared with the microcomputer controlled dowty retarder, because the double critical speed dowty retarder does not need external energy and control, it uses the hydraulic principle to realize the function of automatic identification and control of vehicle running speed.