Common Types And Causes Of Overhead Bridge Crane Loss Accidents

Common types and causes of overhead bridge crane loss accidents

 

Overhead bridge crane loss accidents refer to accidents in which heavy objects such as cranes and slings fall from the sky during lifting operations, causing personal injury and equipment damage. Loss accidents are a common serious accident with this equipment.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

There are mainly the following types:

 

1. Rope-off accident:

 

Rope-off accidents refer to casualties and damage accidents caused by heavy objects falling off and collapsing from the tied lifting ropes. The main cause of rope-off accidents is improper binding methods and essentials of heavy objects, causing heavy objects to slip. Improper selection of the hoisting center of gravity causes the hoisting load to be unbalanced or the hoisting center to be unstable, causing heavy objects to fall off; the suspended load swings due to collision, impact, vibration, etc., causing heavy objects to fall.

 

2. Decoupling accident:

 

Unhooking accidents refer to accidents in which heavy objects, lifting ropes or special slings fall off from the hook mouth, resulting in the loss of heavy objects. The main reasons for the decoupling accident are the lack of hook protection device on the crane hook; the failure of the hook protection device; improper lifting method, deformation of the hook opening, etc.

 

 

3. Rope breaking accident:

 

According to the series, the main causes of wire rope breakage are overloaded hoisting that causes the wire rope to break; the lifting limit switch fails, causing the wire rope to break due to over-coiling; the oblique hanging cable is messed up and the wire rope is crushed; the wire rope is fatigued, deformed, and worn due to long-term use and lack of maintenance. , damaged, reaching or exceeding the scrap standard, and still in use due to breakage accidents.

 

The main reason for wire rope breakage is that the lifting angle is too large. This causes the tensile strength of the hoisting rope to exceed this value and break. Improper selection of hoisting wire rope specifications, or still using wire ropes that have reached the scrap standard to bundle hoisting heavy objects, causing the hoisting wire rope to break; there are no protective measures such as gaskets at the contact point between the hoisting wire rope and the heavy object, causing the hoisting wire rope to be cut at the corners and break. accident.

 

4. Hook breakage accident:

 

Hook breakage accidents refer to weight loss accidents caused by hook breakage. Most hook breakage accidents are caused by defects in the hook material. The hook body is still in use after long-term wear or is often overloaded, which reduces the cross-section and reaches the scrap standard, causing fatigue damage or even breakage damage.

 

 

Overhead bridge crane loss accidents mainly occur in the pickup and winding system of the lifting mechanism. In addition to falling ropes, unhooking, breaking ropes, and breaking hooks, the fixation of both ends of each lifting wire rope is also very important, such as whether the safety ring of the wire rope on the drum can guarantee more than 2 turns, whether there is a descending limit protection, and whether the wire rope drum is Whether the fixing structure of the pressure plate and wedge on the device is safe and reasonable, etc.