How to use the proximity switch, which one is better

Proximity switch is a position switch that can be operated without mechanical contact with moving parts. When an object approaches the sensing surface of the switch to the operating distance, it does not require mechanical contact or any pressure to make the switch act, thereby driving AC or DC appliances or provide control instructions to computer devices. Proximity switch is a kind of switch type sensor (namely non-contact switch), it has the characteristics of travel switch and micro switch, and has sensing performance, and it has reliable action, stable performance, fast frequency response, long application life and resistance It has strong interference ability, and has the characteristics of waterproof, shockproof and corrosion resistance. Products are inductive, capacitive, Hall, AC and DC.

Proximity switch, also known as non-contact proximity switch, is an ideal electronic switch sensor. When the metal detector is close to the sensing area of ​​the switch, the switch can quickly issue electrical commands without contact, pressure, sparks, and accurately reflect the position and stroke of the motion mechanism. Even if it is used for general stroke control, its positioning accuracy and operation Frequency, service life, ease of installation and adjustment, and adaptability to harsh environments cannot be compared with general mechanical limit switches. It is widely used in machine tool, metallurgy, chemical, textile and printing industries. In the automatic control system, it can be used as a limit, counting, positioning control and automatic protection link. Proximity switches have the characteristics of long service life, reliable operation, high repeat positioning accuracy, no mechanical wear, no sparks, no noise, and strong anti-vibration ability. Therefore, so far, the application range of proximity switches has become wider and wider, and the speed of its own development and innovation is also extremely rapid.

The main function of proximity switch

(1) Inspection distance

Detect the stop, start, and pass positions of elevators and lifting equipment; detect the position of the vehicle to prevent two objects from colliding; detect the set position of the working machine, the limit position of the moving machine or component; detect the stop position of the rotating body, the valve Open or close position; detect the movement position of the piston in the cylinder or hydraulic cylinder.

(2) Size control

The size control device for sheet metal punching and shearing; automatic selection and identification of the length of metal parts; detection of the height of piles during automatic loading and unloading; detection of the length, width, height and volume of the article.

(3) Whether the detection object exists or not, whether there are product packaging boxes on the production packaging line; whether there are product parts or not.

(4) Rotation speed and speed control

Control the speed of the conveyor belt; control the speed of rotating machinery; control the speed and number of revolutions together with various pulse generators.

(5) Counting and control

Detect the number of products flowing on the production line; measure the number of revolutions of high-speed rotating shafts or discs; count parts.

(6) Detect abnormality

Detect the presence of bottle caps; determine whether the product is qualified or unqualified; detect the lack of metal products in the packaging box; distinguish between metal and non-metal parts; check whether the product has a label; alarm in the dangerous area of the crane; automatic start and stop of the safety escalator.

(7) Measurement control

Automatic measurement of products or parts; control the number or flow rate by detecting the pointer range of the meter and the meter; detecting the buoy to control the height and flow of the measuring surface; detecting the iron buoy in the stainless steel barrel; the control of the upper or lower limit of the instrument range; flow control, horizontal control.

(8) Identify the object

According to the code on the carrier to identify right and wrong.

(9) Information transmission ASI (bus) connects the data transmission of sensors at various positions on the equipment in the production line (50-100 meters) and so on.