Common faults and solutions of bridge crane.

There are three general methods to repair the deflection of main girder: flame correction method, prestress method and electric welding method. Among them, the flame correction method is to heat the deformed part of the metal and correct the metal deformation by using the compressive plastic deformation characteristics of the metal after heating.

Prestressing method is to weld two supports at both ends, put on tie bars, and then rotate the nuts on the tie bars, so that the tie bars are tensioned and the main girder arches. The electric welding method is to weld channel steel or angle steel from both sides to the middle with large current at the lower parts of two main beams with multiple electric welding machines, and force the main beams to arch by using the principle of heating and cooling.

2, the car is not smooth.

One is the inspection of uneven joints; The first is the inspection of local wheel unevenness. The former inspection method is to move the car slowly and observe whether there is a gap between the wheel rolling surface and the track surface.

During the inspection, a feeler gauge can be inserted between the wheel tread and the track for measurement. The latter inspection method is to measure the gap between the wheel tread and the track with a feeler gauge where there is a gap.

Then, according to the size of the gap, choose steel plates with different thicknesses to be placed between the running wheel and the track, and slowly move the trolley to make another wheel on the same track press on the steel plates. If there is no gap between the moving wheel and the track, it means that the track with pad is low. If there is a gap, it means that there is no problem with the track and there is no need for padding.

3. The car slipped

You can put two lead wires with the same diameter on the track surface in the wet area, drive the car to the lead wire and press it over, then take out the lead wire and measure its thickness with a caliper.

Obviously, the thick wheel pressure is small, and the thin wheel pressure is large. There is another way: sprinkle fine sand evenly on the slippery section of any track, then drive here and go back and forth several times. If it is still slipping, it means that there is no problem with this drive wheel, but the pressure of the drive wheel on the other track is low.

Extended data

Fault handling

1. When the car breaks down that day, it must be stopped immediately for inspection. When parking, a warning sign "No switching on when someone is working" should be hung, and a special person should be appointed to take charge of safety monitoring.

2. When the car passes by with the broken crown block, it must be in good contact with the upper and lower sides. After obtaining the consent, ring the bell to signal and implement it at a uniform and slow speed.

3. After troubleshooting, it is necessary to clean up the sundries left by the maintenance crown, and continue the operation only after being notified of power failure.

Overhaul operation

1. The crown block belongs to high-altitude equipment. Maintenance safety report must be filled in during maintenance, and it can be implemented only after it is approved by the competent department.

2. In case of power failure, warning flags and warning lines should be hung on the maintenance site, and the safety belt must be worn when working at height above 2 meters.

3, when using the escalator operation, want someone to help, put steady, put firmly. Someone must look after it.

4. Replace spare parts, tools and appliances steadily to avoid falling and hurting people.

5, two or more people work, must cooperate with each other, coordinated.

6, after maintenance, protective facilities must be reset.

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