Analyze the function and application principle of the limit switch

What are the functions of limit switches?

Limit switches, also known as travel switches, can be installed on relatively stationary objects (such as fixed frames, door frames, etc., called still life) or moving objects (such as driving, car doors, etc., called animals). When the animal approaches the still object, the switch linkage drives the switch contacts, causing the closed contacts to open or the open contacts to close. Control the circuit and the motor by changing the opening and closing states of the switch contacts. So what is the function of the limit switch? Let's find out together.

1. Protection

The most important function of a limit switch is its protective function. Limit switches, also known as stroke limit switches, are mainly used to control the stroke of mechanical equipment for limit protection. In fact, travel limit switches are installed in pre-arranged positions.

When the travel is impacted by the moving parts of the production machinery, the contacts of the travel limit switch act, effectively switching between circuits. The limit switch is a circuit appliance that can be switched correctly according to the travel position of the moving part. A limit switch works like a push button. Widely used in various machine color aluminum doors and windows, hoisting machinery, etc., to control its stroke and perform terminal limit protection

2. Daily life

With the continuous progress of society, electrical equipment is widely used in our daily life. In many electrical equipment, the use of limit switches is inseparable. So what is the function of limit switches? The most important function of limit switches is to provide interlock protection for machinery.

In daily life, the most common ones are limit switches in washing machines and tape recorders. When the washing machine spins, the medium speed is high. If you accidentally open the washing machine or the cover and put your hands in it, it is easy to cause harm to the human body. In order to effectively avoid the occurrence of such accidents, most washing machines are equipped with electrical contacts. Once the door or cover of the washing machine is opened, the washing machine will automatically cut off the power, forcing the rotating parts to stop rotating, effectively avoiding the occurrence of injuries.

3. Industry

The function of the limit switch is also manifested in the industrial field. It is mainly used to convert the mechanical displacement into an electrical signal, so as to effectively change the operating state of the motor and control the mechanical action or program control.

The function of the limit switch is to form a more complex and scientific automation equipment with other industrial equipment. The limit switch on the machine tool effectively controls the movement of the workpiece and the automatic feed stroke, avoiding the occurrence of collision accidents. By using limit switches, the controlled object can automatically change direction between specified positions to achieve continuous reciprocating motion.