Mini Pulley

Ever-Power Group

A pulley is a small wheel with a groove around it and can rotate around the shaft. A simple machine that can rotate around the central axis is called a pulley, which is composed of a grooved disc that can rotate around the central axis and a flexible cable that can cross the disc.

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Basic information of pulley

Definition 1

when using pulley, the pulley whose axis position moves with the object being pulled is called moving pulley.

Definition 2

if the weight is directly hung on the pulley, the pulley also rises when lifting the weight, such a pulley is called the pulley

Texture of material

Wood pulley, steel pulley and engineering plastic pulley can be made of various materials according to actual use requirements.

Connection method

Hook type, chain type, wheel material type, ring type and chain type, cable-stayed type, etc.

“In mechanics, a typical pulley is a round wheel that can rotate around a central axis. There is a groove on the circular surface of the round wheel, and the rope is wound in the groove. If either end of the rope is pulled by force, the friction between the rope and the round wheel will make the round wheel rotate around the central axis.”

Pulley differentiation

According to whether the central axis of the pulley moves or not, the pulley can be divided into “fixed pulley” and “movable pulley”; the central axis of the fixed pulley is fixed, while the central axis of the movable pulley can move, each with its own advantages and disadvantages. The fixed pulley and movable pulley can be assembled together to form a pulley block, which not only saves labor, but also can change the direction of force.

Pulley & Features

Classification, Number

Fixed pulley, movable pulley and pulley block (or divided into single pulley, double pulley, three pulley, four pulley and even multi pulley).


Pull the load, change the direction of force application, transmit power, etc.

The fixed pulley can not save labor, and in the case of neglecting the rope weight and the friction between the rope and the pulley, the force used to lift the weight of the rope is equal no matter where the force direction is, because the power arm and resistance arm are equal and equal to the radius of the pulley.

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“The painting of pulley first appeared in an Assyrian relief in the 8th century BC. This relief shows a very simple pulley, which can only change the direction of force application. The main purpose is to facilitate the force application, and will not give any mechanical benefits.In China, the drawing of pulley device first appeared in Han Dynasty’s portrait brick and pottery well model. There is also a discussion about pulley in Mojing.”

“The ancient Greeks classified pulleys as simple machines. As early as 400 BC, the ancient Greeks already knew how to use the compound pulley. In about 330 BC, Aristotle’s 18th question in his book mechanical problems was devoted to the study of “compound pulley” system. Archimedes contributed a lot of knowledge about simple machinery and explained the kinematic theory of pulley in detail.”

“It is said that Archimedes used the compound pulley alone to pull a large sea going ship full of goods and passengers. In the first century, Alejandro’s Hiro analyzed and wrote a theory about the compound pulley, proving that the ratio of load to applied force is equal to the number of rope segments bearing the load, namely “pulley principle”.”

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