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What are the possible reasons for the fracture of the wheel axle of the dump skip car? How to improve?

Views: 0     Author: Site Editor     Publish Time: 2022-09-27      Origin: Site

The fracture position of the axle is at the welding position of the two limit plates of the axle. In the actual use process, the limit plate plays a very important role. It can not only prevent the shaft and axle frame from being damaged due to the rotation of the wheel axle, but also prevent the axial movement of the rear dump inclined shaft skip car body. Through the field observation of the broken shaft, the reasons for the fracture of the wheel set shaft are summarized as follows:

1. Fatigue damage.

The dead weight and cargo weight of the rear dump skip car act on the wheel set, and the wheel set will have a vibration impact every time it passes through a rail interface. The wheel set operates at a high speed for a long time, and under the impact stress, it is easy to generate fatigue at the welding position of the limit plate of the wheel axle, thus causing the fracture of the axle.

2. Stress concentration

Welding stress concentration occurs at the welding position between the limit plate and the axle wheel.

In view of the above reasons for axle breakage. The following improvement methods can be adopted:

1. Wheel axle outer surface sleeve welding steel semicircle

A steel semicircle with the same diameter as the shaft is welded on the outer surface of the axle in the middle of the limit plate, with a thickness of 4-6 mm. The steel semicircle is staggered with the shaft, so that the welding stress is evenly distributed in the direction of the shaft diameter. The two limit plates are welded on both ends of the steel semicircle, and two triangular steel plates are added inside the limit plate to fix it, even if the limit plate plays its due role, It also avoids the excessive concentrated radial welding stress caused by direct welding on the same section of the shaft wheel.

2. The limit plate is directly welded to the shaft with triangular reinforcement.

The advantage of this method is that the process is simple, but the disadvantage is that the triangular rib is less welded, the strength is not enough, and the welding is more, and the radial welding stress concentration is formed.

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