micro push button switch

The micro push button switch is a switch widely used in electronic, electrical, aviation, aerospace and mechanical electrical equipment for automatic control. This switch is composed of two micro switches and a bracket part, so that two sets of circuits can be turned on or off at the same time in the automatic control circuit.

As a factory with more than 15 years of experience in the design and production of micro push button switch, FILN can provide you with customized services, including product light color, voltage, light brightness, etc. At the same time, FILN is also a factory with CCC, American UL, European CE, CB, ROHS environmental certification, IP67 and other standards, which means that you will get a high-quality standard micro push button switch.

The main technical performance indicators of micro push button switch:

Rated load 30Vd∙c∙‚ 1A;
Contact resistance ≤0∙02Ω;
Insulation resistance ≥1 000MΩ;
Dielectric strength 250V;
Action stroke ≤2mm;
Life 10000 times.

The low resistance of the micro switch is unstable for many reasons. To solve it, the structure of the contact part of the switch must be analyzed in detail, the assembly method must be checked, and the problem can be pinpointed, so that they can be solved one by one.

For this reason, we analyzed the switch with poor low resistance, and found that the two “V”-shaped grooves set on the positioning card in the switch are obviously asymmetrical, and the angles of the “V”-shaped grooves are very different. .

Due to the asymmetry of the “V”-shaped groove, a pair of contact pieces installed in the “V”-shaped groove will have different heights, resulting in different contact pressures between the R arc part of the contact piece and the short conductive parts. will produce low-resistance instability;

In addition, after the two short conductive parts are installed in the base, the bending plane also has the problem of different heights.

There are two reasons for the different bending planes of the two short conductive parts:

One is caused by the inconsistency of the depth of the step groove in the base;

The other is that the size of the conductive parts changes after the riveting process during the assembly process, resulting in different bending planes and uneven deformation of the two conductive parts.

In this way, it is bound to aggravate the poor contact between the moving contact piece and the short conductive parts and the long conductive parts, resulting in low resistance instability, large low resistance, or even failure;

Furthermore, if the gap between the bending plane of the conductive member and the base is too large, the contact pressure between the movable contact piece and the short conductive member in the normally-on state will decrease, which will also cause the low resistance to be unstable or too large.

Read more about the Car Indicator Lights

Low resistance unstable

The poor conversion synchronization of the micro push button switch means that the buttons of the two micro-switches cannot act at the same time to connect the line under the push of the handle, but one after the other, resulting in a hysteresis action.

This problem is caused by the accumulated error after the parts are assembled, and the other is caused by the serious deformation of the step plane at the lower end of the handle.

The poor consistency of the parts will cause a large difference in the action stroke of the micro switch, and the step plane at the lower end of the handle is seriously deformed, which will cause the change of the contact position of the micro switch button.

The handle parts are solid parts in the original design, with a diameter of 4mm and a step diameter of 5∙5mm.

In the injection molding process, shrinkage deformation will occur (for plastic parts, the surrounding wall thickness must be as consistent as possible), resulting in uneven step plane and poor linearity, and the step plane and the button of the micro switch cannot be in contact at the same time.

Rotate the handle by an angle, and the position of the contact point changes accordingly.

Therefore, the conversion synchronization of the micro push button switch during use is poor.

To address this, we have improved the structure of the handle part.

In the center of the original handle, a deep hole with a diameter of 2mm is added, so that the thickness of the material around the handle is basically uniform.

After such improvement, the injection molded parts no longer shrink and deform, the plane of the step end is straight, and the linearity of the outer circle is obviously improved, and is no longer affected by the rotation angle of the handle.

At the same time, corrections regarding part consistency “minimize cumulative errors.”

Working Principle and Fault Detection Method of Relay Indicator Light Module

Summarize

Through the above correction and improvement of the relevant parts of the micro push button switch, the long-standing problems of low resistance, instability and poor synchronization of the micro push button switch have been completely solved, so that the micro push button switch can be successfully mass-produced.