The reasons and preventive measures for the derailment of electric semi-gate crane

The derailment of electric semi - gate crane refers to the crash of a crane in the course of running, and then the wheel is completely out of orbit.

In the survey of cranes with derailment accidents, the cranes with the derailment accidents have the following common points:

1. The large width of the wheel tread and the smaller width of the top of the track;

2. There is a gnawing phenomenon in the operation of large vehicles;

3. Fixed hook bolts for large vehicles;

4. When the accident occurred, the fixed hook bolts of the track were broken, and the orbit shift and other problems occurred.

These similarities provide a great clue to the reasons why we found the semi-portal crane derailment.

It can be seen from the analysis that the reasons for the wheel climbing, derailment and the falling of the electric semi-door crane are as follows:

(1) the brake torque of the crane operation brake is inconsistent.

The wheels on both sides of the cart are not running synchronously, and the big car body is skewed.

(2) the minimum wheel of the cart wheel is too small.

(3) the gap between the tread of the wheel and the top of the track is too wide, leading to a large tilt operation Angle and the probability of the wheel climbing.

(4) low strength of homemade hook bolts in fixed track.

In order to prevent the derailment accident of semi-portal crane, it is important to take into account how to prevent crane gnawing and climbing rail.

When the track is installed, it should conform to the orbital tolerance and use the rail clamp to ensure the fixed and stable track.

To prevent the crane from climbing out of orbit by welding the anti-derailment device at the wheel side of the cart.

Prevent the happening of the semi gantry crane electric derailment fall, not only is more safe for all kinds of accessories, crane in the process of daily use, but also to do a good job of inspection maintenance crane, the abnormal situation such as found on the crane rail to process maintenance in time, guarantee the safe running of the crane.

In the process of operation, the operator should comply with the safety operation procedure of semi-portal crane, safely use the semi-portal crane, and avoid the damage to the crane caused by irregular operation