Medical instrument knob,custom rotary knobs,Variable capacitors knob

There are many types of knob switches, including common button type, mushroom head type, self-locking type, self resetting type, rotary handle type, indicator type, symbol type with light and key type. There are single button, double button, three button and different combinations. Generally, the building block structure is adopted, which is composed of button cap, return spring, bridge contact and shell. It is usually made into a composite type, with a pair of normally closed contacts and normally open contacts, Some products can increase the number of contacts through the series connection of multiple components.

There is also a self-contained button, which can automatically maintain the closed position after being pressed, and can only be opened after power failure.

The knob switch can complete the basic control of start, stop, forward and reverse rotation, speed change and interlock.

Usually, each rotary switch has two pairs of contacts. Each pair of contacts consists of a normally open contact and a normally closed contact. When the button is pressed, the two pairs of contacts act at the same time, the normally closed contact is open and the normally open contact is closed.

In order to indicate the function of each button and avoid misoperation, the button cap is usually made into different colors to show difference. The colors include red, green, black, yellow, blue, white, etc. For example, red means stop button, green means start button, etc. The main parameters, type, mounting hole size, contact quantity and current capacity of the button switch are described in detail in the product manual.

Main application of knob switch in daily life

In addition to the knob mode used in the switch design of microwave ovens, this switch is also widely used in electric fans. As we all know, the traditional electric fan needs to adjust the wind speed by rotating, so the knob switch is an indispensable component in the design of electric fan. Relevant experimental research shows that the service life of the knob switch is much longer than that of the button switch. Therefore, for these household appliances that are frequently used every day, the knob switching mode is the most important way to ensure the service life of the appliances.

For many older people, the impression of the knob switch still stays on some old household appliances, such as radios, recorders, etc. In the initial design and production of these electrical appliances, a large number of rotary switch schemes were used, which were recognized by the market and won the favor of users. Nowadays, although these appliances have been gradually eliminated, these switch design schemes are still kept in the latest home appliance design. Knob adjustment mode is the mainstream control mode of home appliances in the future and will be widely used.

Of course, in addition to our common household appliances, in many professional fields, various electronic instruments and equipment also use a large number of knob switching methods. This switch mode can help researchers better control these precision instruments and achieve the best use effect. It is precisely because this switch mode is widely used in various fields that relevant manufacturers are also actively investing in the research and development of knob type design, hoping to produce switch products with higher quality and better safety performance. It is believed that in the near future, we can see the use scheme of the knob switch on more equipment or instruments, get a better feeling of use, and realize the convenience of this control mode.

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