Overload protection systems - Essay Example

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Overload protection systems

Depending on the type of overload, the appropriate protection systems are chosen and employed is design of machines. For instance, relays, overload release and circuit breakers are used to protect systems against mechanical overload (Bhalja & Maheshwari, 2011). The most common overload protection systems are mechanical and hydraulic overload protection systems. Mechanical overload protection systems are used in mechanical presses; the working principle is based on a delicate shear plate that requires approximately 130% capacity to be broken. When the shear plate is broken, a slide in position has some space of free distance that allows the press to go through a complete stroke. The shear plate is replaced after each case of overload. Hydraulic overload protection systems are more common because the force of the press can be restricted by controlling the hydraulic pressure, and the press can be restarted after an incidence of overload without having to change the plates. Overload protection systems (a) mechanical (b) hydraulic (Altan & Tekkaya, 2012). The system consists of an oil pad placed between the slide and the connecting rod to which pressure is applied when force is developing. The pressure from the oil is used to move another piston, which acts to intensify the pressurized air. In case the oil pressure (air pressure) exceeds a threshold value, the oil is sapped back into a tank. Therefore, the force applied is restricted and some space is created for free movement. ...Show more

Summary

In industrial applications, overload occurs when machines are loaded beyond their capacity leading to breakdown of the machine. For this reasons, machines must be protected against mechanical overloading using overload protection systems…
Author : dorianrosenbaum
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