Limit switchIt is an electrical switch that defines the limit position of the motion of the mechanical device. Limit switches are available in contact and non-contact. The contact type is relatively intuitive. On the moving parts of the mechanical equipment, the upper stroke switch is installed, and the stop position of the limit position is fixed at a fixed point relative to the movement, or the opposite installation position. When the mechanical contact of the travel switch hits the stop, the control circuit is cut (or changed) and the machine stops or changes operation. Due to the inertial motion of the machine, this limit switch has a certain "overtravel" to protect the switch from damage. There are many non-contact forms, such as reed switches, photoelectric, inductive, etc. These forms can be seen in elevators. Of course there are more advanced forms.
Limit switch is a commonly usedSmall currentThe main electrical appliance. The collision or control circuit is realized by the collision of the moving parts of the production machinery to make the contact action to achieve a certain control purpose. Typically, such switches are used to limit the position or travel of the mechanical motion, allowing the motion machine to automatically stop, reverse, shift, or automatically reciprocate at a certain position or stroke.
onElectrical Control System, the role of the limit switch is to achieve sequential control, positioning control and position status detection. Used to control the travel and limit protection of mechanical equipment. Construction: consists of the operating head, the contact system and the housing.
In actual production, the limit switch is installed in a pre-arranged position. When the module mounted on the moving part of the production machine hits the travel switch, the contact of the limit switch acts to realize the switching of the circuit. Therefore, the stroke switch is an electric appliance that switches the circuit according to the stroke position of the moving part, and its function is similar to that of the button.
Limit switches are widely used in various types of machine tools and lifting machinery to control their travel and limit the terminal. In the control circuit of the elevator, the travel switch is also used to control the speed of the switch car door, the limit of the automatic door opening and closing, and the upper and lower limit protection of the car.
The limit switch can be installed on a relatively stationary object (such as a fixed frame, a door frame, etc., referred to as a still life) or a moving object (such as a car, a door, etc., referred to as an animal). When the animal approaches the still life, the contact of the switch's linkage drive switch causes the closed contact to break or the open contact to close. The operation of the circuit and mechanism is controlled by the change of the opening and closing state of the switch contacts.
The rotation speed is high during the dehydration (drying) of the washing machine. If someone opens the door or cover of the washing machine inadvertently, then reach into it. It is easy to cause harm to people. In order to avoid such accidents, an electric contact is installed on the door or cover of the washing machine. When someone opens the door or cover of the washing machine, the motor is automatically powered off, even by mechanical The method is linked to make the door or cover open and immediately "brake", forcing the rotating parts to stop, so as not to hurt the person.
In tape recorders and recorders, we often use fast forward or rewind, the tape spins rapidly, but automatically stops when it reaches the end of the tape. . Here, the travel switch once again plays a role, but this time it is not caused by the collision but by the sudden increase of the tension of the tape.
Limit switches are primarily used to transform mechanical displacement into Electric Signal , to change the operating state of the motor to control mechanical action or as program control.
The real use of limit switches is in the industry, where it works with other devices to form more complexAutomation equipment.
There are many such limit switches on the machine that can be used to control the movement of the workpiece or the stroke of the automatic feed to avoid collisions. Sometimes the limit switch is used to automatically reverse the controlled object between the two specified positions, thereby obtaining continuous reciprocating motion. For example, the car that automatically transports the material reaches the end point and touches the limit switch. When the rollover mechanism is connected, the material in the car is turned over and returned to the starting point. After reaching the starting point, it touches the start switch of the starting point, turns on the circuit of the loading mechanism, and starts automatic loading. Always go this way and become a setAutomatic production line, It does not require people to work around the clock, saving people's physical labor.
Limit switches can be widely used in lifting, transmission machinery in construction, port, mining and other industriesThree-coordinatesControls and limits, limit switches are made of high precisionDrive Ratiospeed reducerComposed with mechanical memory control mechanism and sensor synchronized with its output axis, because WTAU series limit switches have small size, many functions, high precision, and limit Tone, versatility maintenance and easy to install and use to adjust the characteristics of the application in a very wide range of construction machinery.
Wenzhou Zhongguan Close Electromechanical Manufacturing Co., Ltd.
