First of all, let me ask you, do you know the role of the magnetic switch? If you have not heard of magnetic switches, you must know the various sensors used in security doors or televisions, etc. It uses cylinders to live and function to bring needs and convenience to people, and if you are also a person who likes to practice, then you must also be interested in this. Switch related knowledge it.
The magnetic switch is used to detect the position of the cylinder piston, that is, to detect the movement stroke of the piston. The use of magnetic switches can feedback cylinder piston rod out of position, the use of this feedback signal can control other components of the action; can also control the cylinder stroke, for example, the cylinder full stroke of 100, the stroke can be adjusted to 80; installed more than one magnetic switch can also achieve the cylinder in the multi-point stop (but stop precision is not high).
Classification of SMC magnetic switches
SMC magnetic switches can be divided into two types: contact type and non-contact type.SMC D-? series magnetic switches, ? without mark or A, B, C, E, Z is contact type, and F, G, H, J, K, M, P, Y is non-contact type. There is no leakage current in the contact type. SMC magnetic switches can be divided into two-wire, three-wire (NPN and PNP) and four-wire (less frequently used). In addition the standard length of wire for magnetic switches is 0.5m. However, 3m or 5m can be selected.
SMC magnetic switch, D-C73, SMC magnetic switch mountings, BJ2-012 magnetic switch means that the induction through the magnet, the “magnetic” is the magnet, there are several types of magnets, the market above the commonly used magnets are rubber magnet, the Permanent magnet ferrite, sintered neodymium iron boron, etc. The switch is the reed switch. The reed switch is short for dry reed switch, is a contact passive electronic switching components, with a simple structure, small size to facilitate control and other advantages, its shell is generally a sealed glass tube, the tube is equipped with two ferrous elastic reed electrical plate, also filled with an inert gas called metal rhodium.
Is the magnet, there are several types of magnets, the market above the commonly used magnets are rubber magnet, permanent magnet ferrite, sintered neodymium iron boron, etc.. The switch is the reed switch. The reed switch is a dry reed switch, is a contact passive electronic switching components, with a simple structure, small size to facilitate control and other advantages, its shell is generally a sealed glass tube, the tube is equipped with two iron elastic reed electrical plate, but also filled with an inert gas called metal rhodium. Normally, the two reeds made of special materials in the glass tube are separated. When there is a magnetic material close to the glass tube, under the action of magnetic field magnetic lines, the two reeds in the tube are magnetized and attracted to contact each other, the reeds will be sucked together, so that the node connected to the circuit connected. After the external magnetic force disappears, the two reeds separate due to their own elasticity and the line is disconnected. Therefore, as a circuit switching device controlled by magnetic field signals, the reed switch can be used as a sensor for counting, limiting and so on (mainly used in security systems for the production of door and window magnets), and is also widely used in various communication devices. In practice, permanent magnets are usually used to control whether the two metal pieces are connected or not, so they are also called “magnetrons”.
Reed switch is also called magnetron, it is similar to Hall components, but the nature of the principle is different, is the use of magnetic field signal to control a switching element, no magnetic disconnect, can be used to detect the state of the circuit or mechanical movement, another magnetic switch is the market said proximity switch, door magnetic switch, also called induction switch, it is dry a good mold and is a standard size plastic shell, the reed switch potted in the black Shell inside the wire lead out the other half of the plastic shell with a magnet fixed at the other end when the magnet is close to the switch with a wire, send a switch signal! The general signal distance is 10mm to connect, this product is widely quoted to the security doors, household doors, printers, fax machines, telephones, and other electronic equipment above. There is also a magnetic switch is in the closed metal or plastic tube, set a point or multi-point reed switch, and then the tube through one or more, hollow and internal equipped with ring-type magnet floating ball, and the use of fixed ring, control the floating ball and reed switch in the relevant position, so that the floating ball in a certain range of up and down floating. The magnets inside the float are used to attract the contacts of the reed switch to produce an open and close action.
