New fastener hydraulic nuts and bolts with higher preload compared to ordinary nuts.
Hydraulic nuts and bolts are a new type of fasteners, hydraulic nuts in the locking process, is directly acting on the nut by hydraulic force to produce ultra-high preload, close to the bolt yield point, even under vibration conditions, will not loosen. They are especially suitable for connecting and fastening components of coal mining equipment such as shearers and roadheaders in narrow underground coal mines, and can also be used in metallurgy, chemical and construction machinery. The pressurization system of the hydraulic nut is mainly composed of ultra-high pressure hand oil pump, ultra-high pressure hose, hydraulic nut and high-strength bolt.
In the narrow space of the coal mine, when connecting and fastening the parts of coal mining equipment such as shearers and roadheaders, high-strength stud bolts of more than 10.9 must be used to ensure the safety and stability of the equipment. Compared with ordinary nuts, hydraulic nuts not only have higher preload, but also are more convenient and safe to use, which is the development trend of fasteners in the future.
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