Some common questions with cranes

What are the common lifting machinery accidents?

Common lifting machinery accidents include: extrusion, impact, hooking, falling, derailment, collapse, tipping, 

breaking, electric shock, etc.

Such as: decoupling and hitting people at the scene, wire rope breaking and pulling people, moving hanging 

objects hitting people, wire rope hanging people, pulleys hitting people, falling from high altitude and other 

casualties; Lifting, falling and other equipment accidents; electric shock accidents where equipment accidentally 

touches high-voltage lines or inductive electrified bodies during lifting operations; and various operational 

accidents that occur during maintenance.

The main causes of these accidents are operational factors, equipment factors and environmental factors.

1. Operational factors mainly include:

(1) Decoupling caused by improper lifting method, loose binding, scattered or swinging lifting objects to injure 

people.

(2) Violation of operating regulations, such as casualties and equipment damage caused by overloaded lifting, 

people working in dangerous areas, etc., and drivers who do not use weight limiters, stoppers, brakes or return to 

their positions or anchors in accordance with regulations. Accidents such as overloading, over-hoisting, derailment, 

and tipping caused by custom.

(3) Collisions caused by improper command and uncoordinated movements, etc.

2. Equipment factors mainly include:

(1) Failure of lifting gear, such as heavy objects falling caused by damage to hooks, grabs, wire ropes, nets, etc.

(2) Accidents caused by the failure of the control system of the lifting equipment or the failure of the safety device, 

such as the impact and pinching of heavy objects caused by the failure of the brake device.

(3) Accidents caused by insufficient component strength, such as the toppling of tower cranes, are caused by the 

tilting moment of the tower exceeding its stable moment.

(4) Electric shock accidents caused by electrical damage.

(5) Overhead crane derailment accidents caused by rail gnawing, excessive wear, or bending.

3. Environmental factors mainly include:

(1) Derailment, collapse, tipping and other equipment accidents caused by strong natural disasters such as 

lightning, gusts, tornadoes, typhoons, and earthquakes.

(2) Collision and extrusion accidents caused by crowded and messy venues.

(3)Collision accidents caused by insufficient brightness and blocking the line of sight, etc.

What are the general safety requirements for lifting workers?

In the "Safety Regulations for Hoisting Machinery", it is stipulated that:

(1) The command signal should be clear and comply with the regulations.

(2) When hanging, the angle between the hanging ropes should be less than 120° to avoid excessive force on the 

hanging ropes.

(3) Pads should be added to the edges and corners where ropes and chains pass.

(4) When commanding the object to turn over, the center of gravity should be changed smoothly, and no actions 

beyond the commanding intention should occur.

(5) When entering under a suspended heavy object, first contact the driver and set up a supporting device.

(6)When multiple people are tied and hung, one person should be in charge of commanding.

Prohibited items for cranes mainly include the following items:

(1) Use the lifting mechanism to lift or transfer personnel.

(2) Lifting flammable, explosive items and acid.

(3) Overload lifting.

(4) Hitting a car with another car.

(5) Throw heavy objects down from the crane.

(7)Non-drivers (personnel without operating certificates) operate the crane.

Crane drivers "do not hang ten times" at work

Crane drivers do not hang ten things at work:

(1) Standing on the suspended objects, do not hang floating objects.

(2) Do not lift when overloaded.

(3) The signal is unclear, unclear, and the light is dim.

(4) Flammables, explosives and acids are not suspended.

(5) Do not hang when the equipment is sick or the hanging objects are directly processed.

(6) If the steel wire rope is unqualified or the binding is not firm, it will not be hung.

(7) Objects buried in the ground or solidified on the ground shall not be hung if the weight is unknown.

(8) If the steel and iron ladles are too full, they will not be lifted.

(9) Crooked pulling and oblique dragging, sharp corners, and blade corners are not padded or hung.

(10) Those who command in violation of regulations will not be suspended.