Screws are simple machines that are surprisingly common in everyday life. These small devices are capable of generating enormous forces and facilitating work processes, which is why they play a significant role in lifting loads by supporting the movement and handling of loads.
Their story
About cigarette systems earliest records in ancient Egypt, Mesopotamia and in Greece appear, where hoists, pulleys and gears were often used to move heavy objects.
Later, it spread throughout the world, and during the Renaissance, scientists also studied the snail. added to the list of six simple machines. According to the Italian Galileo Galilei's definition, simple machines „do not create energy, they only transform it”.
DID YOU KNOW? In addition to astronomy, mathematics and natural sciences, Galileo Galilei of Italy also made a significant contribution to the development of physics.
The laws of motion of bodies His theoretical and practical work, together with the independent work of Kepler and Descartes, was a precursor to the classical mechanics later discovered by Newton.
He was a pioneer in that, unlike European traditions, he conducted precise experiments and insisted on mathematical descriptions of the laws of nature.
In addition to the snail, the simple machines also included:
- the wheel;
- the axis;
- the inclined plane;
- the wedge; and
- the screw.
The six simple machines have often served and continue to serve as the basis for more complex machines.
Types of snails
For snails there are several types, the following are the most important:
- Fixed
In the case of fixed pulleys, the belt pulley is a single pulley fixed to the support structure., ball bearing They have an axis. They do not assist in exerting force, but such screws can modify the angle and direction of force exertion.
- Movable
The movable pulley – as its name suggests – is not fixed, but consists of a shaft in a movable block.
- Complex
This combination of fixed and movable pulleys is also known as a rope and pulley system. With the right combination of fixed and movable pulleys, the force required to lift a load can be significantly reduced.
In the system as well
Any combination of rope and pulley can be part of a simple system, used to lift objects or change their direction of movement. The best example of this is the various belt conveyor systems mean.
Modern materials (hardened steel, modern ropes, cables) Snails are capable of lifting even very heavy loads, provided that maintenance In such cases, their lifespan can be very long.
Paco Rueda image of the Pixabay - can be found at.
