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It ‘ll give you the basics of pulleys

In mechanics, a typical pulley is a round wheel that rotates around a central axis.  There is a groove on the circumferential surface of the round wheel. If the rope is wound around the groove and either end of the rope is pulled forcibly, the friction between the rope and the round wheel will cause the round wheel to rotate around the central axis.  A pulley is actually a deformed lever that can turn.  The main function of pulley is to pull the load, change the direction of force, transmission power and so on.  A machine consisting of multiple pulleys is called a “pulley block”, or “compound pulley”.  The pulley block has greater mechanical benefits and can pull heavier loads.  Pulleys can also be used as components in chain or belt drives to transfer power from one rotating axis to another.  

According to the position of the central shaft of the pulley whether it moves, the pulley can be divided into “fixed pulley”, “moving pulley”;  The central axis of fixed pulley is fixed, while the central axis of moving pulley can be moved, each with its own advantages and disadvantages.  And fixed pulley and moving pulley assembly together can form pulley group, pulley group not only save force and can change the direction of force.  

Pulley appears in the form of knowledge point in the physics teaching material of junior high school, which requires answers to the problems such as the direction of force, the moving distance of rope end and the situation of work done.  

Basic information editing broadcast  

Classification, number  

Fixed pulley, moving pulley, pulley group (or divided into single pulley, double pulley, three pulley, four pulley down to many rounds, etc.).  

The material  

Wooden pulley, steel pulley and engineering plastic pulley, can have all sorts of material according to actual use requirement.  


Pull the load, change the direction of force, transmission power, etc.  

Connection methods  

Hook type, chain type, wheel material type, ring type and chain type, cable-drawn type.  

Dimensions and Materials  

The pulley  

Small size pulleys with small loads (D<350mm) are generally made into solid pulleys, using 15, Q235 or cast iron (such as HT200).  

Pulleys subjected to large loads are generally ductile iron or cast steel (such as ZG270-500), cast into a structure with bars and holes or spokes  

Large pulleys (D>800mm) are generally welded with sections and steel plates. 

Post time: Jun-29-2022