Analysis and troubleshooting of three-leg failures of bridge crane trolley

Table of Contents

The editor will introduce to you what are the three legs of an overhead crane trolley, as well as the reasons and troubleshooting methods for the three legs of the trolley.

1. What is the failure of the three legs of the trolley?

When the trolley of the bridge crane is working, only three of the four wheels are on the track, and the phenomenon that one wheel hangs in the air is the phenomenon that the trolley has three legs, which is one of the common faults of the bridge crane.

2. The failure of the three legs of the trolley causes consequences

1) Make the trolley body vibrate and swing when starting and braking, and the trolley cannot walk smoothly.

2) Make the trolley's own weight and load only supported by three wheels, and the maximum wheel pressure of the wheels exceeds the design value.

3) Causes the phenomenon of rail gnawing during the operation of the trolley .

4) The whole machine will vibrate; the trolley is also easy to derail, and there are hidden dangers of safety and life.

5) The bridge frame is easily deformed and worn due to uneven force, which reduces the service life of the equipment.

3. Analysis of the cause of the failure of the three legs of the trolley

The reasons for the three legs of the trolley can be divided into track problems caused by its own failure and deformation, installation and wear.

(1) The car's own factors

1) The shape of the trolley frame itself does not meet the technical requirements or is deformed due to a malfunction.

2) One of the four wheels is too small in diameter.

3) The installation of the wheels does not meet the technical requirements.

4) The diameter error of the two wheels on the diagonal of the trolley frame is too large.

(2) Track factors include track deformation, wear, installation quality and main girder deformation, or local dent of track caused by wavy deformation of the upper cover, excessive track elevation, etc.

4. Inspection of the failure of the three legs of the trolley

(1) Inspection of trolley wheels, check the deviation of the trolley wheels according to the tolerance of the wheel diameter.

(2) Track inspection, the inspection items are mainly track bidder deviation. The inspection methods include theodolite (or level), connector and wire drawing method.

(3) Comprehensive inspection of the three legs of the trolley. The three legs of the trolley sometimes have a combined effect of multiple reasons, including wheel causes and track causes. Comprehensive analysis is adopted. The main reason can be found. The working condition of the comprehensive inspection is that the operating brake of the trolley is opened. The manpower pushes the trolley to walk, and analyzes section by section on the track.