The production process of prestressed concrete sleepers is the pre-tensioning method in terms of its application of prestress, and can be divided into the flow unit-transfer method (model movement) and the pedestal method (model not moving) in terms of whether the model is moving. Since China's concrete sleeper factories generally use the assembly unit-conveyor method production line, the pedestal method production line is only very individual, and the II. track plate production line process introduced later is basically the same, so only the flower-conveyor method process of concrete sleepers is introduced here.
China's early concrete sleeper production is mainly the assembly unit method, that is, the model is lifted to each production station by bridge crane on the production line, and there are special equipment on these stations to complete the corresponding process, and the whole process is a realization process of converting raw materials into finished products. Because the production of prestressed concrete sleepers has more than 10 processes, all of which use bridge cranes to move the model, not only low production efficiency, but also not conducive to safe production, and later developed into mainly roller table transmission model, bridge crane is mainly used to lift the model into the steam curing pool and equipment inspection during lifting equipment, so that the original flow unit method developed into the flow unit - transmission method. The prestressed concrete sleeper flow unit-conveyor process is to use 2×5 or 2×4 combined steel models on the assembly line according to the specified process flow, and in turn through each production station, including steel bar assembly, tensioning, pouring concrete, vibration molding, steam curing, stretching steel bars, demolding, finished product stacking, etc., to complete all production operations of concrete sleeper products. The production cycle of concrete sleeper products is equivalent to the turnaround period of the model. When sleepers are produced according to the assembly unit-transfer method, the operating time of each process is the main indicator to control the production efficiency of sleepers. Depending on the level of production,
The process cycle time used in China's sleeper production line is generally 3min~5min. Figure 4 shows the production process of concrete sleepers.