Telemecanique limit switch Schneider ZCMD41L1

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Telemecanique limit switch Schneider ZCMD41L1

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A limit switch is an electrical switch used to limit the maximum movement position of mechanical equipment. [2] Limit switches come in both contact and non-contact types. The contact type is more intuitive. On the moving parts of mechanical equipment, a travel switch is installed, and a limit position stopper is installed on the fixed point of relative motion, or installed in the opposite position. When the mechanical contact of the travel switch touches the stopper, it cuts off (or changes) the control circuit, and the machine stops running or changes its operation. Due to the inertial motion of machinery, this type of travel switch has a certain degree of 'overtravel' to protect the switch from damage. There are many non-contact forms, such as reed switches, photoelectric switches, induction switches, etc., which can be seen in elevators. Of course, there are more forms of *.

Limit switch is a commonly used low current main control device. By using the collision of moving parts in production machinery to make their contacts move, the control circuit can be connected or disconnected to achieve certain control objectives. Usually, such switches are used to limit the position or stroke of mechanical motion, causing the moving machinery to automatically stop, reverse, change speed, or automatically move back and forth at a certain position or stroke.

In electrical control systems, the function of switch limit is to achieve sequential control, positioning control, and detection of position status. Used for controlling the travel and limit protection of mechanical equipment. Construction: Composed of an operating head, contact system, and housing.

In actual production, limit switches are installed in pre arranged positions. When the module installed on the moving parts of the production machinery collides with the travel switch, the contact of the limit switch is activated to switch the circuit. Therefore, a travel switch is an electrical device that switches circuits based on the travel position of moving parts, and its working principle is similar to that of a button.

Limit switches are widely used in various types of machine tools and lifting machinery to control their travel and provide 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.

Folding and editing the purpose of this paragraph

Folding daily life

There are many applications of limit switches, and they can be found in many electrical appliances. What can such a simple switch do? It mainly plays a role in chain protection. The most common example is its application in washing machines and recorders (video recorders).

During the dehydration (spin drying) process of the washing machine, the speed is very high. If someone accidentally opens the door or cover of the washing machine and then extends their hand in, it is easy to cause injury to people. In order to avoid such accidents, 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 will be automatically cut off, and even mechanical linkage will be used to immediately 'brake' the rotating parts as soon as the door or cover is opened, forcing them to stop and avoid personal injury.

In tape recorders and video recorders, we often use fast forward or rewind, where the tape rotates rapidly but automatically stops when it reaches the end of the tape. The travel switch once again played a role here, but this time it was not caused by collision but by the sudden increase in tension of the magnetic tape that triggered the action.

Folding Industry

Limit switches are mainly used to convert mechanical displacement into electrical signals, allowing the operating state of the motor to be changed, thereby controlling mechanical actions or used for program control.

The true application of limit switches is in industry, where they are combined with other equipment to form more complex automation devices.

There are many limit switches on the machine tool that control the movement of the workpiece or the automatic feed stroke to avoid collision accidents. Sometimes limit switches are used to automatically reverse the direction of the controlled object between two specified positions, resulting in continuous reciprocating motion. For example, when the automatic material transport car reaches the end point and hits the limit switch, the overturning mechanism is turned on, and the materials in the car are overturned and returned to the starting point. After reaching the starting point, he touched the travel switch at the starting point, connected the circuit of the loading mechanism, and started automatic loading. If it continues like this, it becomes an automated production line that doesn't require human supervision and works day and night, saving people's physical labor.

Telemecanique limit switch Schneider ZCMD41L1