Do You Know How To Maintain The Key Switch?

The key switch has the advantages of small contact resistance load, accurate operating force error, and diversified specifications. It has been widely used in electronic equipment and white goods, such as audio and video products, digital products, remote controls, communication products, and household appliances. , Security products, toys, computer products, fitness equipment, medical equipment, money detector pens, laser pen buttons and so on.

Because of the environmental conditions of the key switch (elastic force with pressure less than 2 times/environmental temperature and humidity conditions and electrical performance), large equipment and high-load buttons are directly replaced by conductive rubber or dome switch hardware shrapnel, such as medical equipment, TV. machine remote control, etc.

Use and maintenance:

(1) The button should be checked frequently to remove the dirt on it. Due to the small distance between the contacts of the button, after years of use or when the seals are not good, the inflow of dust or emulsions of various stages of oil will cause the insulation to decrease or even short-circuit accidents. In this case, insulation and cleaning must be carried out, and appropriate sealing measures must be taken.

(2) When the button is used in a high temperature occasion, it is easy to deform and age the plastic, resulting in the loosening of the button and the short circuit between the connection screws. According to the situation, a tightening ring can be added to tighten it during installation, or an insulating plastic tube can be added to the wiring screw to prevent loosening.

(3) The button with the indicator light will easily deform the plastic lampshade due to the heating of the bulb for a long time, which makes it difficult to replace the bulb. Therefore, it is not suitable for use in places with long power-on time; if you want to use it, you can appropriately reduce the voltage of the bulb to prolong its service life.

(4) If poor contact is found, the cause should be found out: if the contact surface is damaged, it can be trimmed with a fine file; if there is dust or soot on the contact surface, it should be wiped with a clean cotton cloth dipped in solvent; If the spring fails, it should be replaced; if the contact is severely burned, the product should be replaced.

button

Choose:

(1) According to different use occasions and specific uses: according to the use occasions, select the type of button, such as open type, protective type, waterproof type, anti-corrosion type, etc.; select the appropriate form according to the use, such as handle rotary type, key type, emergency type, light type, etc. For example, the general button on the panel of the console cabinet can be opened first; if it is necessary to display the working status, the type with indicator light should be used; in very important places, the key type should be used to prevent misoperation by unrelated personnel; in the presence of corrosive gas Use anti-corrosion.

(2) Select the color of buttons and indicator lights according to the requirements of working status, instructions and working conditions: green for "start" or "power on", and red for "stop". In addition, the voltage of the indicator light (bulb) is divided into 6.3V, 12V, 24V and so on.

(3) According to the needs of the control loop, determine the number of different buttons: such as single button, double button, three buttons, multiple buttons, etc. For example, when three controls of "forward", "reverse" and "stop" are required, three buttons can be used and installed in the same button box; when only "start" and "stop" controls are required, two buttons can be assembled in the same button box. in the same button box.