there are many uses of limit switches in daily life. today i will talk with you in detail:
travel switch, a kind of position switch (also known as limit switch), is a commonly used low-current master electrical appliance. the collision of the moving parts of the production machinery is used to make the contacts actuate to switch on or off the control circuit to achieve certain control purposes. usually, this type of switch is used to limit the position or stroke of the mechanical movement, so that the moving machine automatically stops, moves in the opposite direction, moves at a variable speed or moves back and forth automatically according to a certain position or stroke.
there are many applications of the travel switch, and it is found in many electrical appliances. so what can such a simple switch do? it mainly plays a role of chain protection. the most common example is its application in washing machines and tape recorders (video recorders).
during the spin-drying process of the washing machine, the rotation speed is very high. if someone opens the door or cover of the washing machine inadvertently at this time, and then stretches his hａnd in, it is easy to cause injury to people. in order to avoid this kind of accident, the washing machine an electrical contact is installed on the door or cover of the washing machine. once someone opens the door or cover of the washing machine, the motor is automatically cut off, and even mechanically linked, so that the door or cover will immediately brake and force it to rotate stop the parts to avoid personal injury.
in tape recorders and video recorders, we often use fast forward or rewind. the tape rotates rapidly, but it stops automatically when it reaches the end of the tape. here the limit switch played a role again, but this time it was caused not by a collision but by a sudden increase in the tension of the tape.