During the lifting process of an industrial door, the lifting force required by the motor varies at different lifting positions. Without springs, excessive lifting force would cause the industrial door to derail.
If the force is too weak, the lifting load on the motor increases, significantly reducing its lifespan over time. Qishili industrial doors, equipped with springs, are significantly different. The spring force varies according to the lifting force at different positions, ensuring a balance between the door's weight and the spring force.
