For the welding roller frame, the roller and weldment are round, and all rollers are the same length, and the axis is parallel. So the function of the active sprocket weldment is to weld the force on it, and it is also the reaction force of the rolling sprocket on the weldment, which is called the circumferential force. In other words, if the weldment rotates around the axis, its axis will not move up and down. If there is a serious damage to the roller frame, for example, when the roller frame is installed, there is a bit of error, the shape and size of the weldment are different or the shape is irregular, then the front and rear rollers will be very different, higher and lower, the axis of the roller and the axis of the weldment will lead to non parallel. In this way, the contact between the driving sprocket and the driven sprocket of the weldment will cause the shaft to move up and down.

Now let's talk about the result of the analysis: the speed of the up and down movement of the weldment shaft is proportional to its rotational speed. If the number of rollers deflected at the same angle is large, the up and down movement speed of the weldment shaft will be faster and faster. Also, if the left and right side of the weldment is biased, the speed of the shaft will change. If the axis of the welding roller frame is in the same plane, the distance between the rollers has no effect on the up and down movement speed of the axis. Therefore, if there is a little error in the installation of the roller carrier, it is not good.