With the rapid development of economy, lifting operation in economic construction is becoming more and more frequent and common areas are brother. In response to this trend, some lifting equipment and rigging manufacturing enterprises to seize the market, improve the performance of hoisting equipment and rigging and technical content, the development of different specifications of the model of lifting equipment and rigging have been developed and, lifting some of the items have been formed annotation and series.

Lifting the sling and rigging and end fittings, what kind of method.

1, according to industry practice, we put up for the rigid feeding device of heavy lifting operation is called a sling, such as: grab, clamp, sucker, special hanger;

2, flexible tool workpiece system node called rigging, such as: steel wire rope and chain, synthetic fibre hoisting belt;

3, end fittings are commonly used rings, shackle, wire card etc..

The heavy fall, is one of the most important hurt hoisting accident, including two damage caused by heavy scattered. The reasons causing the fall in a sling improper use, heavy bundle of standard application is not strong, hooking and unhooking, chuck a sudden power failure, rigging, to improve the safety and reliability of the equipment and the operation process, improve work efficiency will play a big role. At the same time, process and characteristics of heavy work and the decision lifting is a higher risk of special operation. The workers in the use of the sling inspection is not standardized and the improper use of accidents often cause, the case also many. Therefore said, lifting sling is small, but significant, can not be taken lightly.

Statistics and analysis of the crane accident shows that, due to the hanging position selection is not correct, rigging selection, improper use and the occurrence of crane accidents accounted for a large proportion, especially the lifting of some large parts, the company claims the hook technology personnel quality is low and the sense of responsibility is not strong, often lead to accidents, and cause significant economic losses. If a unit linked to staff in the use of 2 43.5mm diameter steel wire rope hoist double pocket 3 stacked in a total of about 72 tons of steel, because the diameter of the rope is chosen too small overload hoisting, and edges without lining protection, when the plate rises to the height of about 2.5 meters, the rope breaks in the corner, caused by the plate falling. Again, a unit linked in the flat car hanging from the discharge of a 45 ton, due to illegal operations (the set of 4 rings, hanging with only 3 of them), after the lifting of the workpiece is falling, the impact will be wire breakage, resulting in the fall. Therefore, in the use and management of the rigging, not negligence and let down.

How to safely use a sling?

First, determine the operation plan.

Lifting technology is high, the risk is big, many people cooperate with each other, mutual coordination, the unified command of the special types of work. So the operating personnel must be trained, and certificates. Before start of work must also weight and center of gravity environment on the job site, heavy lifting line, the workpiece, rigging selection, equipped with lifting equipment meets the requirements, analysis and calculation, the correct formulation of lifting scheme.

Two, the proper use of sling:

1, the user should be familiar with all kinds of rigging and end fitting performance, matters needing attention, scrapped.

2, the cable should be suspended and the shape characteristics of the workpiece and the specific requirements of fit, in does not have the conditions of use case, never to use.

3, before the operation, to deal with the sling and its accessories were examined to confirm intact, can be used.

4, hanging, should be the right choice of cable; before ascension, should confirm the binding is strong.

More than 5 of the rated lifting weight lifting slings, and accessories, shall not exceed the maximum working load of the suspended state.

Should prevent damage sling and accessories 6, operations, should be added when necessary protection in the corner angle.

In 7, sling should use to conduct regular inspections, conditional, for large tonnage and important products spreader and end fittings shall be carried out inspection.

Three, seize the large pieces of lifting method

For large workpiece lifting or assembly in place, due to the large tonnage, complex, expensive, and many factors with, to further improve the operation difficulty and risk, therefore, in a sling large workpiece, should grasp and the following essentials:

To observe the shape of workpiece in 1, before the operation, master the position of the center of gravity, and confirm the weight of the workpiece according to drawings.

2, the correct choice of ropes, shackles, hooks and other rigging. Selection of the wire rope, a rope bearing force, according to the S (Newton) =100 D2 calculation formula. Of which: D is the diameter of wire rope, unit: mm.

3, the design for lifting rings or lug, should be carefully examined before operation, and all the rings in the caucasus.

4, the workpiece does not ring, should be the right choice of cable point position. And the hook crane work center of gravity position alignment.

5, pay attention to the angle between the rope should be less than 90 degrees.

The 6 corners, the rope through the door, must add the corner.

7, the lifting before trial hoisting process, confirmation and then continue to the next step of work.