The sling refers to the force-bearing tool tied between the hoisting machine and the object to be lifted in order to realize the movement of the object, as well as the force-bearing member to stabilize the space structure. The editor introduces the correct use of the crane sling connection.
One, the correct use of the sling connection method
When hoisting, use the sling connection method correctly: the sling should be correctly placed and connected to the load in a safe way. The sling must be placed on the load so that the load can be balanced to the width of the sling; never knotted Or twist the sling; the stitched part cannot be placed on the hook or lifting equipment; and always be placed on the upright part of the sling; prevent label damage by staying away from the load, the hook and the locking angle.
Precautions for the use of multiple combination slings: The evaluation of the ultimate working force of multiple combination slings is determined by the symmetry of the combined sling to bear the load, that is, when lifting, the branches of the sling are distributed symmetrically and evenly according to the design, with the same Vertical angle. For combination slings, if the branches cannot be uniformly loaded according to the design, the maximum strength is on one branch, it will be the sum of the maximum bearing capacity of the adjacent branches at the design angle. The same result is in the four-combination sling, if it is not a rigid load , Will also be counted.
Note: For rigid loads, most of the gravity may be borne by three or even two of them, and the remaining one only protects the balance of the load.
When hoisting, the protection of the sling: the sling should be kept away from sharp edges, friction and abrasion, whether it is away from the load or lifting equipment, the appropriate part of the sling should be strengthened and protected from sharp edges and abrasion, and additional reinforcement is necessary Protection supplements are necessary.
2. How to use the rotating ring of the sling
1. The main ring used to form chain slings, steel wire rope slings and fiber slings should be long-shaped rings, and circular rings can be used in other occasions.
2. The connecting ring must be a long ring.
3. For the reuse of the rings with scars or significant corrosion, the static tensile test must be carried out in accordance with 8.2 of GB14736.
4. It is not allowed to re-use defective lifting rings after welding.
5. Unmarked rings cannot be used without confirmation.
6. The lifting rings on the combined parts of the lifting rigging shall be inspected regularly according to the requirements of the combined parts.
7. The diameter of the connecting ring connected to the chain must be larger than the diameter of the chain.
8. The number of chains and cables directly connected to a single ring shall not be more than three or four, and the connection between the cables and the main ring.
9. Do not use hammering to correct the twisted rings.
10. It is forbidden to throw hoist rings.
11. Do not pull the hoisting ring from under the heavy object or let the heavy object roll on the hoisting ring.
12. Shackles are not allowed to replace connecting rings.
13. Replace the connecting ring in the loading and unloading tool on site, allowing the use of assembled connecting chain rings.
The sling is an indispensable tool for lifting objects in hoisting machinery. In normal use, attention should be paid to maintenance and scrapped in time to avoid accidents.
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