Main Classifications and Applications of Limit Switch

Various limit switches have been used in our daily life, such as rotary limit switches, piston limit switches or hinge limit switches and so on. What are they used for? Then, this article will introduce the main classifications and applications of the so-called limit switch.

First of all, what is the limit switch? Actually, it is a kind of appliance that can protect the built-in micro switch from being damaged by external harm, such as water, oil or dust and so on. When it comes to the classification, generally speaking, there are two main classification methods. One is operating principle and the other is the interior structure.
According to the working principle, it can be divided into operating limit switch and ultimate limit switch. The former is designed to send out the signal to mechanism, while the latter is used to prevent the accident being generated from the overlarge mechanism motion. However, based on the driving mechanism of the built-in micro switch, there is piston-type limit switch, hinge pendulum rod limit switch and rotary pendulum rod limit switch. The piston-type limit switch has two main varieties. One is sealed by O-shape ring, which enjoys excellent function of blocking scarps. The other one is based on sealing rubber, which has much better sealing property. Which one will be chosen is based on the practical application occasion. The hinge pendulum rod limit switch is in accordance with activity volume of the plunger to make sure the rod proportion. The rotary pendulum rod limit switch relies on coil spring to gain the reset force and cam wheel to drive kicker ram. Besides the mentioned three main types, limit switches manufacturers have produced many other ones so as to satisfy different occasions.
Then, what concrete applications do those limit switches have? Specifically speaking, the application area of the limit switches can be divided into daily life field and industrial manufacturer field. When it comes to the daily life, the LED push button switch can be seen in washing machine, video cassette recorder, dust collector, microwave oven, dryer and the likes. Take the washing machine for instance. As we all know, spin-dry course of washing machine asks for high rotate speed, which will do harm on people if their hands touch the cover. In order to stop such an accident, a limit switch can be adopted. Then, the power supply will be cut off once people close to machine. As to the industrial manufacturing area, the limit switch plays a key role in delivering the electrical signal of machinery movement so as to avoid the safety accidents and the machine tool is a typical application occasion.
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