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Overview of rigging accessories lifting appliance: the rigid take-off device for lifting operation; the lifting appliance can directly lift items,
It mainly includes: rated lifting capacity of hook, end hook and lifting appliance: the lifting appliance is suspended vertically under general use conditions;
Composition of sling: it generally consists of high-strength flexible parts (steel wire rope, lifting ring chain; ultimate working load of sling: refers to the single sling sagging under general service conditions; maximum safe working load of sling: except for vertical suspension to make sling use and safety precautions Overview, general safety regulations for lifting appliances and rigging, types and specifications of commonly used rigging, rigging: the rigid lifting device for lifting operation can directly lift items, mainly including: hook, end hook, lifting ring, shackle, special spreader, etc. Rated lifting capacity of sling: under general use conditions, the maximum mass (weight) of the sling is allowed to bear when it is suspended vertically. When it is lifted, the combination device with flexible hook hanging on the object is called sling or sling. Composition of rigging: it is generally composed of high-strength flexible parts (steel wire rope, lifting ring chain, artificial fiber belt, etc.) and end ring, hook, shackle, etc. Limit working load of sling: it refers to the maximum mass (weight) that a single sling is allowed to bear when it is suspended vertically under general use conditions. In addition to the use of vertical suspension, there is an included angle between the sling lifting point and the object, which changes the stress of the sling and the maximum mass that it is allowed to bear under specific hanging mode. It is called the maximum safe working load of sling. General safety regulations for slings and riggings purchase of slings and riggings must be made and inspected by professional manufacturers according to national standards, with certificates of conformity and maintenance instructions. The product shall be marked with rated lifting capacity, production number, manufacturing date and manufacturer's name at the obvious place. For self-made lifting appliances with a rated lifting capacity of more than 500kg, the design drawings, calculation sheets and other technical data shall be submitted to the production and operation Department for approval. The production workshop must arrange special personnel to weave the steel wire rope by hand according to the national standard. The minimum distance of the splicing part of each lock catch shall not be less than 10 times of the diameter of the steel wire rope. The splicing operation shall wear each strand at least five times, and at least three times of the five times shall be inserted by the whole strand. For the load test of slings and riggings, the newly purchased slings and riggings shall not be put into use until they pass the test according to the specified test load and test method. The types and specifications of commonly used slings are indispensable tools for binding and fixing objects in the lifting process. The main categories are man-made fiber, rope and wire rope.
For the hoisting or assembly of large workpieces in place, due to the 2113 factors such as large tonnage, complex shape, expensive value and multi person cooperation, the operation difficulty and 5261 risk coefficient are increased. Therefore, when hoisting large workpieces, the following essentials should be mastered:
1 before operation, observe the shape of the workpiece, master the center of gravity position of the workpiece, and confirm the weight of the workpiece according to the drawing;
2. Correctly select ropes, shackles, hooks and other rigging;
3. For the work piece which has a lifting ring (or lifting lug) specially designed for lifting, it shall be carefully inspected before operation, and all lifting rings shall be padded;
4 if there is no lifting ring for the workpiece itself, the position of the cable point shall be correctly selected and the hook head of the crane shall be aligned with the center of gravity of the workpiece;
5. Note that the included angle between ropes should be generally less than 90 degrees of the plate;
6. The corners of the workpiece that the rope passes through must be protected by the right angle;
7. There should be a trial hoisting process before hoisting, and the next operation should be continued after confirming the safety.