利用二阶拉格朗日方程，建立起大、中、小三类提升机的运动微分方程；
With quadratic lagrange equation, large , medium and small of kinds differential equation of movement are established;
工作时，拉矫机必须克服拉坯过程中结晶器内的摩擦力、二冷装置阻力、矫直阻力等。
In the casting process, the withdrawal straightener has to overcome the friction force from the crystallizer and resistance from the secondary cooling device.
工作时，拉矫机必须克服拉坯过程中结晶器内的摩擦力、二冷装置阻力、矫直阻力等。
In the casting process, the withdrawal straightener has to overcome the friction force from the crystallizer and resistance from the secondary cooling device.
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