The micro switch is a safety device for the paper inlet of the shredder, including: a machine cover, three micro switches fixedly installed on the cover, and characterized in that a sliding type switch is arranged between the cover and the three micro switches. Security Control Agency. Once a child's finger or excess paper is inserted into the paper inlet of the shredder, the safety control structure will act, so that the micro switch connected to it will act, the power of the host will be cut off, and the machine will stop working, avoiding the danger of the child's finger being cut. When the situation occurs, the shredder is safer to use, and it also prevents too much paper from entering the inside of the machine core, and the cutter is stuck, which improves the service life of the machine. When the child's fingers are removed, or the number of shredded papers is reduced, under the action of the safety control structure, the circuit is connected and the machine works normally.
How to improve the quality of microswitches:
1. In order to prevent the contact resistance from being out of tolerance and the opening and closing mechanism from failing, the micro switch is designed with a contact material with low tortoise resistivity, not easy to generate various films that are unfavorable for electrical conductivity, good resistance to electrical wear, and high limit arc parameters. . Two different metals are used to form a contact pair, and the contact pressure is increased to crush the contamination film or cause relative sliding friction during the contact reversal process to clear the film and prevent the accumulation of wear objects.
2. In order to limit the metal splashing and material transfer caused by the arc of the micro switch and the electric spark, in addition to the methods described above, the arcing time can also be reduced by improving the arc extinguishing ability:
3. When the micro switch fails due to poor insulation resistance, select a good high temperature anti-aging plastic in the design, and use the methods described in 1 and 2 to reduce the electrical wear of the contacts.
4. When the pressure and stroke are out of tolerance, adjust the action point of the transmission element, replace the material of the transmission element, and design the contact gap, considering the size and hardness of the spring sheet to prevent its fatigue.
5. In order to avoid the poor instantaneousness and excessive jumping time of the micro switch, redesign the shape and size of the spring leaf, use a material with better elasticity and hardness, and adjust the mechanism to make it better.
6. Improve the brazing quality of the micro switch, and the assembly and debugging are good to prevent poor structural relationship.
7. In order to prevent the breakage of the micro switch housing, the quality must be ensured during debugging and installation, the maintenance and inspection during use should be strengthened, and the structure should be improved to increase the limit device.
