Heavy load start problems have been plagued by the researchers and users. Aiming at the problem of the heavy load starting of the twin-roll continuous casting machine with wide lead strip, a new type of mechanical controllable soft start transmission is designed, which are studied on the compound gear train and the conversion relation with planetary gear train and epicyclic gear train. The mathematical model of the controllable soft start transmission is built through the analysis of the transmission mechanism. The key structure of the magneto-rheological brake and the planet carrier are researched deeply based on above analysis. The key technologies of the speed changes, torque changes and power consumption during the starting process of the transmission are studied. The design of a new type of mechanical controllable soft start transmission is successful which have a simple structure, good soft start performance, stable and reliable operation from the experimental results. The large torque problem of the heavy load start process of the twin-roll continuous casting machine with wide lead strip is solved by the transmission. The power consumption of the motor which is required in designed transmission is about 15%-20% lower than the similar products. The transmission's energy saving effect is better compared with the similar products. In conclusion, the new type of mechanical controllable soft start transmission can meet the requirements of the twin-roll continuous casting machine with heavy load start.
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