Common sense about push button switch 2

来源:Dongguan Yanghan Industrial Co., Ltd.  时间:2022-05-26

Generally speaking, mechanical switches may be able to distinguish as follows:
The push button switch is divided into knob type, plate type (including button switch, boat switch) and button type in terms of operation mode; most of the knob type and plate type switch can be maintained (determined) in the on or off state after operation. , such as the daily use of light switches, fan speed control switches, most of these switches do not need to focus on whether they are self-locking, because they have obvious "operation directions"; only button switches are pressed when they are used, and most buttons are used. The switch is used to connect or disconnect the circuit when it is pressed, and the state is restored after the release, so it is sometimes called "bell switch". A self-locking device is added, and the self-locking function is used, so that it can also keep on or off by itself. This is a switch with self-locking. Among them, for a certain requirement, only one of several switches is allowed during operation. In the connected state, when the others need to be disconnected, several push-button switches are combined side by side, and the "interlocking mechanism" is used, only one switch is allowed to be in the connected state, and when the other switch is pressed, the switch is determined. , but at the same time the original switch was released (such as the "play, fast forward, rewind" mechanical button on a tape recorder). For these switches, the contacts can be in one or more groups; there are also many kinds of determination mechanisms, among which the most commonly used is to use a spring hook to slide along the heart-shaped groove, and the two tips of the heart-shaped groove correspond to the determination and release positions of the switch .
As the literal meaning is, "light touch" means that the state of the contact of the button switch can be changed without much effort, so the contact capacity is very small, and the structure is simple. A single-contact button switch that can be pressed with a small amount of force without a certain contact. Now, membrane switches and small micro switches can be regarded as tact switches. Most of the structures are made of two mutually insulated films. Printed conductive lines on the film , connect the lines to each other by pressing; or use a butterfly shrapnel made of thin elastic metal to press the shrapnel to connect the printed circuit.
The switch on the rice cooker and electric kettle is determined after being pressed, but after heating to the specified condition, the magnet or bimetal that determines the switch status will act to reset the switch and cut off the power supply (the rice cooker is switched to the heat preservation state) , may not meet the "reset after power failure" requirement.
Reset after power failure, that is, to determine that the organization operation should be related to the power supply, and the product does not seem to have it, because this requirement can be achieved by using a circuit composed of a general button switch and a relay; but if only one relay (or touch device) is used, one of the A group of normally open contacts is used to control the power supply of the working coil of the relay (toucher), and the relay weighing iron is used as a switch button. After pressing the weighing iron, the contacts of the relay control coil are closed, the coil is energized, and the relay insists on pulling in ( Self-locking), other contacts control other circuits; when the power is cut off, the relay is cut off immediately, the weighing iron is reset, the appropriate button is reset, and the relay weighing iron needs to be pressed again, and the power can be turned on again. The relay is now suitable for a live push button switch.
As for infrared switches, IC card switches, etc., switches with other components are no longer the scope of mechanical switches and cannot be considered mechanical switches.
, it is confirmed after pressing, but after heating to the specified conditions, the magnet or bimetal that determines the status of the button switch acts to reset the switch and cut off the power supply (the rice cooker is switched to the heat preservation status), which may not meet the "reset after power failure". "Require.
Reset after power failure, that is, to determine that the organization operation should be related to the power supply, and the product does not seem to have it, because this requirement can be achieved by using a circuit composed of a general button switch and a relay; but if only one relay (or touch device) is used, one of the A group of normally open contacts is used to control the power supply of the working coil of the relay (toucher), and the relay weighing iron is used as a switch button. After pressing the weighing iron