The pulley is a simple machine that can lift a heavy load with less effort. The pulley is widely used and is often used on cranes. So what kind of pulley is on the crane? How is it used? Huanghe technicians from Xinxiang Crane Rental Company will answer your questions in detail.
There are pulley blocks on the crane. There are fixed pulleys and movable pulleys. The fixed pulley is used to change the direction of the force. It does not save effort. Although the moving pulley works slowly, it saves effort and is half of the fixed pulley.
The pulley unit is a simple machine assembled by multiple moving pulleys and fixed pulleys, which can save effort or change the direction of force. The amount of effort of the pulley group is determined by the number of rope strands, and its mechanical efficiency is determined by the gravity of the pulled object, the gravity of the movable pulley, and friction.
A pulley is a small wheel with grooves around it, which can rotate around an axis. A simple machine composed of a disc with grooves that can rotate around the central axis and a flexible cable (rope, tape, steel cable, chain, etc.) that crosses the disc and can rotate around the central axis is called a pulley.
How to use the crane pulley:
1. Before using the small car crane, check the allowable load of the crane pulley or pulley block, check the pulley grooves, axles, plywood, hooks (or rings) and other parts for crack damage, and whether the pulley can rotate flexibly. Confirmed before use.
2. After putting on the pulley group, you should slowly increase the force. After the rope is tightened, you should check whether each part is good, and if there are any stuck ropes, if it is not correct, you should adjust it before using it.
3. The center of the hook (or ring) of the pulley should be on a plumb line with the center of gravity of the lifting member to prevent the component from being unstable after lifting. The minimum distance between the pulley and the pulley on the pulley block should be determined according to the specific situation, generally 700. --1200mm.
4. The pulley must be cleaned before and after use, and the wheel axle must be lubricated with oil to make it easy to rotate and reduce wear and corrosion.
The above is the relevant introduction of " What pulley is on the crane? How to use it? " Knowing the above content, we know that the crane is a pulley group, there are fixed pulleys and moving pulleys. The fixed pulley is used to change the direction of the force. It does not save effort. Although the moving pulley works slowly, it saves effort and is half of the fixed pulley.