Flat belt drive pdf

This article is about the mechanical concept and device. Flat belt drive pdf the case of a pulley supported by a frame or shell which does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting shell is called a block, and the pulley may be called a sheave.

Various ways of rigging a tackle. A set of pulleys assembled so that they rotate independently on the same axle form a block. A hoist using the compound pulley system yielding an advantage of 4. One end of the rope is attached to the crane frame, another to the winch. This can be shown as follows. Consider the set of pulleys that form the moving block and the parts of the rope that support this block. The simplest theory of operation for a pulley system assumes that the pulleys and lines are weightless, and that there is no energy loss due to friction.

It is also assumed that the lines do not stretch. In equilibrium, the forces on the moving block must sum to zero. In addition the tension in the rope must be the same for each of its parts. This means that the two parts of the rope supporting the moving block must each support half the load. A fixed pulley changes the direction of the force on a rope or belt that moves along its circumference.

Mechanical advantage is gained by combining a fixed pulley with a movable pulley or another fixed pulley of a different diameter. A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two. Diagram 3: The gun tackle “rove to advantage” has the rope attached to the moving pulley. Diagram 3a: The Luff tackle adds a fixed pulley “rove to disadvantage.

The mechanical advantage of the gun tackle can be increased by interchanging the fixed and moving blocks so the rope is attached to the moving block and the rope is pulled in the direction of the lifted load. Thus, the mechanical advantage is three. By adding a pulley to the fixed block of a gun tackle the direction of the pulling force is reversed though the mechanical advantage remains the same, Diagram 3a. This is an example of the Luff tackle. In an ideal system, the massless and frictionless pulleys do not dissipate energy and allow for a change of direction of a rope that does not stretch or wear.

Thus, the mechanical advantage of the system is equal to the number of sections of rope supporting the load. If the pulleys are of differing diameters, a mechanical advantage is realised. It is sometimes referred to as a crowned pulley. Naval Education and Training Professional Development and Technology Center, NAVEDTRA 14037. This page was last edited on 14 December 2017, at 06:10. Computer Software for Belt Conveyor, Belt Feeder and Pulley Shaft Design.

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