Screws are a general term for fasteners, everyday spoken language. Screws are indispensable industrial essentials in daily life: extremely small screws such as cameras, glasses, clocks, electronics, etc.; general screws for televisions, electrical products, musical instruments, furniture, etc.; for engineering, construction, and bridges, large screws are used. Nuts, traffic appliances, airplanes, trams, cars, etc. are used for both size and size. Screws have an important task in the industry. As long as there is industry on the earth, the function of the screw is always important.

The looseness of screws has always been a serious problem in industrial manufacturing and industrial products, and even a fatal hidden danger. This untimely safety accident has caused unpredictable harm to our daily life, work and even transportation and defense military. . Therefore, engineers and scientists from all over the world have long put forward profound research on screw anti-loose, and pray for the final solution.

The anti-loose and anti-fall screws were first invented in the United States more than 30 years ago. The anti-loose and anti-fall screws are special techniques for permanently attaching special engineering plastics to the threads, so that the internal and external threads are squeezed during the locking process, and the engineering plastics are squeezed. The pressure generates a strong reaction force, which greatly increases the friction between the internal and external threads, and provides the absolute resistance to vibration. The anti-loose and drop-resistant screws provide this resistance to be completely distributed throughout the meshing section of the inner and outer threads, and the friction The force is independent of the locking pressure between the internal and external threads. Once the anti-loose and anti-fall screws are locked, the frictional force is generated instantaneously and permanently exists. Even if the anti-loose and anti-falling screw lock is not tight, it will not loosen, unlike the previous one. The method of retreating relies on the friction generated by the pressure of the screw to stop and retreat. Once the screw is loose, the pressure is reduced, the friction is quickly disappeared and the anti-retraction effect is lost, so that the screw is loose.

Since the special engineering plastic on the anti-loose and drop-resistant screws has strong elasticity and memory capacity, the anti-loose and anti-drop screws can be repeatedly disassembled 5 to 50 times, and the anti-loose function of the anti-loose and anti-fall screws still persists. Because this anti-loose engineering plastic is environmentally friendly, lightweight, and re-disassemblable, it is the most reliable anti-loose and drop-resistant screw product available today. Moreover, the special engineering resin on the anti-loose and drop-resistant screws has the advantage of very high chemical stability, acid and alkali resistance, and other solvents, and will not cause oxidative corrosion to the metal, so the anti-loose and anti-fall screws will not rust, The peeling phenomenon of the plating film contributes to the requirements of light weight, weather resistance and high quality. This special engineering plastic, commonly known as drop-resistant glue, is suitable for anti-loose treatment of bolts and nuts of various shapes and various metal materials. The anti-loose screw is called the anti-loose screw, which is most suitable for the fastening of moving parts. The anti-loose screw is used on the US space shuttle. Later, the anti-loose screw is extended to the US automobile manufacturing industry. With the maturity of manufacturing technology and the reduction of cost, anti-loose and anti-fall screws are widely used in 3C, bicycle, ice-skating ski equipment, furniture, sports equipment, medical equipment and other industries, completely replacing traditional anti-backing washers, fully The reliability of the fastening and anti-loosening action of the anti-loose and anti-drop screws is shown.

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