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Our mechanism to build is:



The tower crane tower crane is called a type of crane removable metal frame powered by electric current specially designed to work as a tool in construction.

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Gear

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belt pulley fixed pulley necessarily work and, at least, is attached to another by means of a belt, which is nothing but a closed flexible ring embraces both pulleys.


This type of pulleys have to prevent slippage of the belt on them, because the power transmission providing it directly depends. This forces the shape of the throat necessarily fit the section of the belt used.

basically used two types of belts: flat and trapezoidal.

flat belts with pulleys require slightly pumped or channeled perimeter, the former being the most frequent.

In some special applications are also used ribbed belts and timing require the use of their respective pulleys.



V-Belts are the most widely used and there is a wide variety of sizes and shapes. Its operation is based on the wedge effect that appears between the belt and pulley (the higher the pressure the greater the penetration of the belt on the pulley and therefore more grip strength between the two). This forces the belt does not rest directly on the rim of the gorge, but only on the side walls in a "V".


Utility:

Its usefulness is focused on the transmission of rotary motion between two shafts apart, allowing to increase, decrease or maintain speed, while maintaining or reversing the direction.

Can be found in washing machines, fans, dishwasher, polishing, videos, multicultores, meat cutters, drills, generators, lawn mowers, engine transmissions, compressors, lathes ... multiplier as speed gearbox or gear wheels.

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Pulleys and Sprockets Straps gearing

The gear (gear, sprocket) is basically a wheel with teeth completely covered perimeter. The most common type of gear has straight teeth (longitudinal) but also the teeth are curved, oblique ...

For proper operation, the operator often turn solidarity with its axis, so that both are linked by a detachable joint use another operator named key.


Particular cases of the sprockets are the screw and the rack.

Utility:

This operator can be used for two basic functions:

1.-transmit rotary motion between two shafts with the idea of \u200b\u200bchanging its direction of rotation, speed or direction, either directly coupled together several gears (gear, flashlight, gear train, worm-pinion) or using an articulated chain (chain-sprocket mechanism) .

During the Middle Ages were used gear mechanisms-lantern that were in common use in all hydraulic devices of the era (mills, decks ...).
allows parallel or cross-axis coupling to 90 º.



gear system is widely used in automobile (gearbox), machine tools (drills, lathes, milling ...), watch ... and gearbox, allowing parallel shaft coupling or intersect at any angle.



The worm-gear reducers used in electric motor speed, is also used in high-precision components (micrometer screws).

This system is not reversible (the driving shaft must always be attached to the worm) and has the advantage of providing a large reduction in highest speed in the smallest space. It only allows coupling axis 90 °.




chain-sprocket system can see it on bicycle Bikes, automatic sliding doors (elevators, supermarkets, airports ...), inner workings of engines ... but only allows coupling shafts are parallel.


2.-Transform
swirling in alternative (or vice versa), using mechanisms that combine the sprocket with the rack (rack-pinion system) This assembly is used on locks, playground equipment, microscopes, drills sensitive, corkscrews, outboard engines ...

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Transmits rotary motion between two parallel or perpendicular lines, changing the characteristics of speed and / or direction of rotation.




This system consists of two wheels
solidarity with their axes, whose perimeters are in direct contact
. The movement is transmitted
of a wheel to another by friction (rubbing)

From the technical point of view we must consider at least 4 operators:

1.-axis driver, having the money we want to convey. Normally be attached to a motor. 2.-wheel driving
: solidarity with the driving, pick up the rotation of this which is transmitted by friction (rubbing) to the driven wheel
3.-driven gear: includes the rotation of the driving wheel by friction between them.
4.-Shaft driven: get the rotation of the driven wheel and transmits it to receiver.

From the technological point of view we must consider four elements:







D1: diameter of the driving wheel

D2: diameter of the driven wheel

N1:
drive shaft speed
N2:
driven shaft speed
They're bound by the following mathematical relationship:


equation that tells us we can:

1.-Increase the speed of rotation of the driven
(N1 be greater than the pipe (D1> D2). 2.-Make

both axles
bearing the same speed (N1 = N2)
by combining two wheels of equal diameter (D1 = D2).

3.-Decrease speed
driven shaft (N1> N2) using a driving wheel driven
less than (D1 < D2).

Due to the nature of the coupling between the wheels, the rotation of two consecutive axles contrary, being necessary to resort to an idler if we get both rotate in the same direction.

Because the only binding between the two wheels is the friction that occurs between their perimeters, can not be used for the transmission of large efforts. Often found in appliances audio and video as well as some amusement rides (Ferris wheels, swings ...) in which a tire triggers a taxiway.

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In mechanical engineering, a cam is a mechanical device made of a material (wood, metal, plastic, etc.) That is secured to a shaft and has a specially shaped contour. Thus, the shaft rotation causes the profile or contour of the cam touch, move, push or connect a piece known as a follower. There are two types of followers, translation and rotation.
The union of a cam is known as a union of a point in case of a plane or line join if space. If necessary, you can add teeth to the cam to increase the contact.
a cam design depends on the type of movement to be printed in the supporter. Examples are the camshaft the internal combustion engine, the programmer washing, etc.
can also perform a classification of the cams in their nature. Thus, no revolution, translational, desmodromic (these are those that perform a dual action effect), etc.
The machine is used to make paddles is known as a generator.

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Cam Lever Screw Rod

La Biela crank to convert the continuous rotary motion of a shaft in a reciprocating linear foot of the rod.

process also enables the opposite: to transform a reciprocating linear motion of connecting rod in one continuous rotary shaft which is connected to the eccentric or crank (although it must be introduced slight modifications to increase the inertia turn).

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is used in converting rotary motion one Continuous linear when necessary clamping force or a large reduction ratio. This utility is especially appreciated in two practical applications:

• Union removable objects. To what uses threads with grooves in "V" because its friction prevents loosening easily. Is found in almost all types of objects, or using as nut to unite the material itself (in this case used as a threaded nut on the object itself) or pinning the objects between the head of the screw and nut.

• displacement mechanism. which are often used for square threads (one or more wires) due to its low friction. It is found in many everyday objects: taps, bottle caps and bottles, lipsticks, glue sticks, lifting of workshops, car jacks, clamps, clips, machine tools, corkscrews ...

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Piñon Nut Zipper Composite Pulleys

Convert rotary motion in one continuous line, or vice versa.

When the pinion rotates, its teeth push the zipper, causing the displacement is linear.
If you move the zipper teeth push the pinion getting it rotates on its axis and obtaining a twisting motion.

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hoists or hoists

The hoist is the most common configuration of compound pulley. In a polyspasts, pulleys are divided into two groups, one fixed and one mobile. In each group installed an arbitrary number of pulleys. The load is attached to the mobile group.
The mechanical advantage hoist can be determined by counting the number of segments of rope pulleys reach phones that support the load.

hoists or hoists Examples:

Outline mechanical advantage you get with various compound pulleys:

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hoist How to exert less force to lift a heavy body? Pulleys and levers

Our group came to the conclusion, which was posted on the blog of the eighth (http://educaciontecnologicaoctavos.blogspot.com), which many of the other students they told, Type II hoist is the one that would put less force, and que al ser mas y variadas poleas,la fuerza a ejercer será menor que la otra alternativa(una polea fija y varias poleas moviles)

Suponemos que nuestra respuesta está correcta.

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Levers Pulleys

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Se trata de una rueda , generalmente maciza y acanalada en su borde, que, con el concurso de una cuerda o cable que se hace pasar por el canal, se usa como elemento de transmisión para cambiar la dirección del movimiento en máquinas y mecanismos. Además, formando conjuntos — aparejos o polipastos — sirve para reducir la magnitud de la fuerza necesaria para mover un peso, variando speed. Simple Pulley

Fixed
The easiest way is to use an anchor pulley on a stand, hang a weight at one end of the rope, and pull the other end to lift the weight. This configuration is called a simple pulley fixed .

A simple fixed pulley does not produce a mechanical advantage: the power to be applied is the same that would have been required to lift the object without the pulley. Pulley, however, can apply force in a more convenient. Examples:

P olea Simple Mobile
An alternative way to use the pulley to the load is secure, attach one end of the rope to support and pull the other end to lift the pulley and the load. This configuration is called "simple pulley mobile."
mobile
simple pulley produces a mechanical advantage: the force required to lift the load is just half the force would have been required to lift the load without the pulley. By contrast, the length of the rope to be pulled is twice the distance you want to go to the load.