Flat Pulley
The pulley is a simple machine used to lift heavy objects and save effort.
Services
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Ever-Power
Classification
Fixed pulley, movable pulley, pulley block (or divided into single pulley, double pulley, three pulley, four pulley and even multiple pulleys).
Material
Wooden pulleys, steel pulleys and engineering plastic pulleys can be made of various materials according to actual requirements.
Effect
Pull the load, change the direction of force, transmit power, etc.Connection method: hook type, chain link type, wheel type, ring type and chain type, etc.
Definition of Pulley
The pulley is a small wheel with grooves on the periphery and capable of rotating around an axis. A simple machine that can rotate around the central axis is composed of a grooved disc and a flexible cable (rope, tape, steel cable, chain, etc.) that spans the disc, which is called a pulley.
Fixed pulley and moving pulley
According to the position of the central axis of the pulley, the pulleys can be divided into “fixed pulley” and “moving pulley”; the central axis of the fixed pulley is fixed, and the central axis of the movable pulley can be moved. Each has its own advantages and disadvantages. The fixed pulley and the movable pulley can be assembled together to form a pulley block, which not only saves effort, but can also change the direction of the force.
Pulley History
The painting about the pulley first appeared in an Assyrian relief in the eighth 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 application of force and does not give any mechanical benefits. In China, the drawing of pulley devices first appeared in the portrait tiles and pottery well molds of the Han Dynasty. There are also records about pulleys in the “Mojing”.
Pulley block
Pulley block: a pulley device composed of fixed pulleys and movable pulleys. It saves effort and can change the direction of the force. But it can’t save effort, because the pulley block saves effort, but it takes a lot of distance. In order to save and change the direction of power, the fixed pulley and the movable pulley can be combined into a pulley block.
Fixed pulley
Definition: A pulley that is fixed in a position to rotate without moving is called a fixed pulley. The role of the fixed pulley is to change the direction of the force. The essence of the fixed pulley is an equal-arm lever. The power arm L1 and the resistance arm L2 are equal to the radius of the pulley. According to the lever balance condition, it can be concluded that the fixed pulley does not save effort and distance.
The purpose of the pulley block
In order to save force and change the direction of power, the fixed pulley and the movable pulley can be combined into a pulley block.
The size of the labor-saving, there is no pulley that saves effort and distance.
When using a pulley block, the pulley block uses several ropes to suspend an object, and the force used to lift the object is a fraction of the weight of the object.
About Us
Ever-Power Group is an expert in manufacturing various mechanical transmissions and hydraulic transmissions, such as planetary gear boxes, peristaltic reducers, in-line helical gear reducers, parallel shaft helical gear reducers, helical gear boxes, gear gears, helical gears , Helical gear box, PTO drive shaft, special reducer and related gear components and other related products, sprocket, hydraulic system, vacuum pump, fluid coupling, gear frame, chain, timing pulley, UDL speed variable device, V-belt pulley air compressor, journal low-backlash worm reducer, etc. In addition, we can produce customized gearboxes, gear motors, electric motors and other hydraulic products according to customers’ drawings.
Principle of pulley block
Some middle school physics textbooks believe that the use of pulley blocks to transport or lift goods can only save effort, but not effort. The above conclusions of middle school physics textbooks have a great impact on engineers engaged in mechanical transmission design work, due to transportation devices such as automobiles, trains, and ships. And various mechanical devices will frequently appear in the process of starting, accelerating, decelerating, stopping and other various motions, and consume a lot of energy in the process of starting, accelerating, decelerating, stopping and other various motions, which completely needs to be in theory The above shows how to design or use the transmission system of transportation devices such as cars, trains, ships, etc., to make it in the best energy-saving state, but the above conclusions of middle school physics textbooks make mechanical engineers engage in mechanical transmission design and instruct people to use transportation In the case of vehicles and mechanical devices, the relationship between the number of segments of the pulley block or the transmission ratio of the reducer and energy saving in various states is often ignored, resulting in high energy consumption during operation of many existing transportation vehicles and mechanical transmission devices. The quantity of goods is small.
Hours
Mon – Fri: 9am – 6pm
Weekends: 10am – 5m
