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In order to solve the problem of poor waterproof performance of existing rivets, Guangdong Yueluo Hardware Industry Co., Ltd. has provided a waterproof rivet. By setting an octagonal waterproof part on the lower end face of the waterproof cap for waterproofing, the waterproof cap is subjected to the tensile force of the rivet rod and the supporting force of the object when riveting. The tensile force and supporting force cause stress on the waterproof cap, which in turn causes slight deformation of the waterproof part in close contact with the object, Thus achieving good sealing effect.

At present, there are four basic types of screw tightening: I. Bolt tightening. Its characteristic is that the tightened components are thin and form through holes (without cutting screws) on them. The fastening structure of bolts and nuts is simple and easy to disassemble (can be assembled on both sides). The thickness of the applicable fasteners is very small, not limited to the material of the fasteners, always allowing disassembly, and widely applicable. 2. The fastening feature of double head bolts is that the wall thickness of the tightened component is relatively thick, and blind holes are made on it, and threads are engraved on the blind holes. Thin through hole without screws. Combination stud bolts and nuts. Allow multiple disassembly and assembly without damaging the fasteners. Usually used for fasteners that require too thick, inconvenient perforation, compact structure, and must be fastened with blind holes or frequently disassembled. The characteristic of screw tightening is to pass the screw through the hole of the tightened tool without using a nut and screw it into the screw hole of another tightened tool. (structurally simpler than double headed bolts). Suitable for situations where one of the fasteners is too thick and not frequently disassembled. 4. The characteristic of a fastening screw is to screw it into another threaded hole, press the surface of another part with the front end, or press the depression of that part. Fixing the relative position of two parts can transmit significant force and torque.

By adopting the above technical solution, it is beneficial to eliminate the stress concentration between the pin cap and the pin rod, increase the strength of the pin, and make the pin difficult to cut.

Due to processing reasons, the contact surfaces between the existing chassis and motherboard are generally not on a horizontal plane, especially the motherboard is prone to warping and deformation. When the deformation is slightly severe, if the motherboard is fixed arbitrarily and the low point is fixed first, the deformation of the motherboard will increase, causing the motherboard to deform and causing poor memory contact, affecting normal use.

At present, there are several methods for classifying screws of different lengths mixed together: first, visual recognition and manual sorting. This method is time-consuming, labor-intensive, and inefficient. Secondly, centrifuge the screws and screen them based on their quality. However, screws of the same length may not necessarily have the same quality when the materials of the screws are different. Thirdly, a screening device with sieve holes is used for sorting, but the sieve holes are generally simple geometric shapes that can only roughly distinguish the length of screws. Moreover, the specific position where the screw falls into the sieve hole will also affect the degree of screening. It can be seen that the above screw classification methods have the problem of poor effectiveness.