May 14, 2015

Bridge Crane Overhaul Contents

Overhead Crane

Bridge crane overhaul includes:
Mechanical part: Break down all the mechanisms, including reducer, coupling, drum set, wheel set and extract devices, etc., replace the parts which should be scrapped, re-assemble and lubricate after cleaning. Replace the wire rope and brake.
Electrical part: Break down the motor, then drying, assemble and lubricate. Replace the damaged motor, the brake open unit, damaged controller, repair or replace the protection cabinet, replace all line connection, re-wiring installation, replace lighting signal system control board.
Metal structure part: Correct and consolidate the main beam which appears deflection and lateral bending, clean the entire crane and painting antirust paint twice.

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Brake Scrapped Standard

Brake
(1)Brakesurface with crack or break;
(2) Traveling mechanism brake band with thickness wear of 1/2, lifting mechanism brake band with thickness wear of 1/3;
(3) Burning or charring of the brake band surface;
(4) Plastic deformation occurs with the spring;
(5) Small shaft or the shaft hole diameter wear amount of 5% more than the original diameter.

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Pulley Scrapped Standard

Crane PulleyCrane Pulley
When there are the following defects, thepulleyshould be scrapped and replaced:
1). Wall thickness wear amount of the pulley rope groove reaches 20% of the original thickness;
2). Radial wear amount of the pulley rope groove bottom is more than 50% of the rope diameter or uneven wear more than 3mm;
3). Cast iron pulleys with serious crack and break;
4). Pulley rim with serious damage;
5). There are other defects of the pulley damage to wire rope.

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