Introduction to the Switching-on Method of Self-locking Switch
Release time：2019-03-20 Clicks： Click
How does the self-locking switch connect electricity and how to operate it? Let's share our experience below.
The difference between the self-locking switch with lamp and the normal self-locking switch is that a small indicator light bulb or LED is placed in the space of its keys, one end of which is connected with zero line, the other end is usually connected by a voltage-reducing resistance in parallel with the normal open contacts of the switch. When the switch is closed, the operation of the device also supplies power for the indicator lamp.
1. The air switch QF power supply indicator EL is on when the circuit is switched on.
2. Starting process press start button SB2 KM coil to get electricity KM auxiliary contact closure KM main contact closure motor M starting and connecting operation. When SB2 is loosened, it recovers to the disconnection position, but because the auxiliary contact of KM (closed) is parallel to it, KM coil still keeps on electrifying. The effect of using the movable contacts of the toucher itself to make the coil of the toucher keep on electrifying is called self-locking or self-protecting, and the movable contacts are called self-locking (or self-protecting) contacts. It is precisely because of the effect of self-locking contacts that when SB2 is loosened, the motor can still continue to operate, rather than point operation.
3. The process of termination KM self-locking contact disconnection press the stop button SB1 KM coil power loss KM main contact disconnection motor M stop. When SB1 is loosened, its normally closed contacts recover to the closed position, but because the self-locking contacts of the toucher KM have disconnected and released the self-locking (SB2's normally opened contacts have also been disconnected) at the moment of coil power loss, so the coil of the toucher KM can't get electricity, and the KM coil can't get electricity. When the main contact is disconnected, the motor M will not rotate again.
4. Circuit cut-off air switch QF power supply indicator EL out
In fact, self-locking switch and light touch switch describe switch function from different aspects; "self-locking" refers to that the switch can adhere to a certain condition (on or off) by defining the organization; "light touch" is the strength to clarify the operation of the switch. Generally speaking, mechanical switches can be distinguished as follows:
Switches are divided into knob-type, plate-type (including button switch, BOAT-TYPE switch) and button-type in terms of operation method; most of the knob-type and plate-type switches can adhere to (determine) the condition of switching on or off after operation, such as light switch and fan speed-regulating switch, which are usually used, mostly do not need to focus on whether they are self-locking or not, because there are obvious "operation directions" as long as the button; Type switch, when used, is pressed. Most button switches are used to turn on or off the circuit when pressed, and the condition will be restored after release. So sometimes called "bell switch". In order to reach the condition that "has been pressed", button switch has self-locking equipment, which uses self-locking function, so that it can also adhere to the condition of switching on or off independently. This is a switch with self-locking. For some needs, only one of the switches is allowed to be in the connection state while operating. When other switches need to be disconnected, several button switches are combined side by side and "interlocking organization" is used. Only one switch is allowed to be in the connection determination state. When another switch is pressed, the switch is determined, but the original determination is made together. Turn off and be released (e.g. the "broadcast, fast forward, fast back" mechanical button on the tape recorder). These switches, contacts can be one or more groups; there are many kinds of organizations to determine, among which a spring hook is used to slide along the concentric groove, and the two pointed corresponding switches of the heart groove are used to determine and release orientation.
In other words, a single-contact button switch can be pushed properly with a very small force, without definite one. At present, thin film switch and small micro-switch can be used. Calculate touch switch, structure mostly choose two insulating film printed conductive circuit, through pressing to connect the lines to each other; or use thin elastic metal made of butterfly shrapnel, press the shrapnel to connect the printed circuit.
The switch on the rice cooker and electric water kettle is determined after pressing, but when heated to the specified conditions, the magnet or bimetal sheet action of the switch status is determined, so that the switch is reset and the power supply is blocked together (the rice cooker is converted to the heat preservation status), which may not meet the requirement of reset after power failure.
Reset after power off, that is to say, determine that the organization of work should be related to power supply, the product does not seem to have, because the request can be reached by using the circuit consisting of the usual button switch and relay; but if only one relay (or toucher) is used to control the power supply of the relay (toucher) operating coil, the relay weighing iron is used as a switch button, and the weighing iron is pressed. Afterwards, the contact of the relay control coil closes, the coil gets power, the relay insists on suction (self-locking), and other contacts control other lines; once the power supply is cut off, the relay immediately cuts off, the weighing iron is reset, the appropriate button is reset, and the relay weighing iron needs to be pressed again, so that the power supply can be connected again. This relay is now properly equipped with a live button switch.
As for the infrared switch, IC card switch, etc., the switch with other components is no longer the size of mechanical switch, can not be calculated as mechanical switch.