In the electrical control system, the function of the position switch is to realize sequence control, positioning control and position state detection. It is used to control the stroke and limit protection of mechanical equipment. Structure: It consists of operating head, contact system and housing.
Limit switch
Limit switch
In actual production, the travel switch is installed in a pre-arranged position. When the module installed on the moving parts of the production machinery hits the travel switch, the contacts of the travel switch act to realize the switching of the circuit. Therefore, the travel switch is an electrical appliance that switches the circuit according to the travel position of the moving part, and its working principle is similar to that of a button.
Travel switches are widely used in various machine tools and hoisting machinery to control their travel and perform terminal limit protection. In the control circuit of the elevator, the travel switch is also used to control the speed of opening and closing the car door, the limit of automatic door opening and closing, and the upper and lower limit protection of the car.
The travel switch can be installed on relatively stationary objects (such as fixed frames, door frames, etc., referred to as still life) or on moving objects (such as vehicles, doors, etc., referred to as animals). When the animal approaches the still life, the connecting rod of the switch drives the contacts of the switch to cause the closed contacts to open or the open contacts to close. The action of the circuit and mechanism is controlled by the change of the open and closed states of the switch contacts.