Lifting machinery in the process of operation is strictly forbidden to "pull askew". What is the reason?
1. Cause crane overload. The larger the angle is, the greater the tension of the crane's wire rope will be. If the obstacles on the ground are encountered again in the course of the inclined pulling, the tension of the wire rope will be greater. Therefore, the inclined pulling will make the crane overload.
2. Cause the pendulum to swing. When the cable is pulled askew, the wire rope will form an angle with the vertical line of the ground. Because of this angle, there will be a horizontal component. The larger the angle is, the more medium the lifted weight is, the greater the horizontal component is. Due to the existence of horizontal force, the weight swings at the moment of leaving the ground. This swing easily causes the crane to lose control, resulting in noon collision, damage to the surrounding facilities, thus threatening the safety of the surrounding personnel and resulting in adverse consequences.
3. Cause damage to hoist. It is easy to destroy the parts of crane and cause crane failure when the crane is inclined to pull. Such as: motor burning, protector tripping, pulley breaking, wire rope jumping, etc. It is more dangerous to break the wire rope by pulling the rope obliquely.
There are many common lifting machinery, such as our common electric hoist, hoist and so on, but most of the lifting machinery products can not be "pulled askew" and also applicable to hand chain hoist. In the past few decades, a large number of safety accidents are due to the operator's incorrect use of lifting and rebuilding. Prepare, so, before work, the first thing to do is to understand the product instructions.