免费观看AV_日韩av在线免费观看_国产AV秘无码一区区三区_亚洲无码人妻_AV无码精品一区二区三区_免费一级一级黄色人妻片_91精品国产午夜福利在线观看_日韩久久千不卡_色婷婷91_亚洲欧美日韩一级_久久国产精品第一页_国产亚洲精品女人久久久久久_七月丁香月婷婷_久久综合久久鬼_亚洲无码在线播放

Contact shrapnel crown spring is a mechanical part that uses elasticity to work. Generally made of metal shrapnel steel. It is used to control the movement of parts, alleviate impact or vibration, store energy, measure the size of force, etc. It is widely used in machines and instruments. The types of hardware shrapnel are complex and diverse. According to the shape, they mainly include positive contact, power supply shrapnel, and contact mother shrapnel. Contact shrapnel crown springs belong to the category of metal stamping parts and electronic hardware materials. It is made of stainless steel or manganese after heat treatment. It is an important part of the switch. With the help of the conductivity of the metal shrapnel, it can play a high-quality switch between the operator and the product. At the same time, using the stable resilience of the guozi (automatically return after pressing), and the long life, provide the operator with high-quality tactile feedback!