Lock bolt structure

Abstract

The invention discloses a lock bolt structure. The lock bolt structure comprises a bolt and a nut, and is further provided with a lower disc-shaped component; the nut end of the lower disc-shaped component is provided with a lower disc-shaped gasket, a workpiece nesting circular tube is arranged at the workpiece end, and the outer diameter of the workpiece nesting circular tube is matched with a first workpiece fixing hole in a first workpiece; a bolt through hole is formed in the center of the workpiece nesting circular tube, the bolt through hole is a conical hole, and the inner diameter ofthe nut end is larger than the inner diameter of the workpiece end; the bolt is a double-end bolt, the thread of the workpiece end is matched with the thread of a second workpiece threaded hole on a second workpiece in a threaded mode, the nut end is matched with the thread of the nut in a threaded mode, and the thread of the workpiece end is in the same rotation direction as the thread of the nutend; the middle part of the bolt is in the shape of a circular truncated cone which is matched to the bolt through hole; and the axes of the bolt, the nut, the lower disc-shaped gasket, the workpiecenesting circular tube, the conical hole and the first workpiece fixing hole coincide. The lock bolt structure has the beneficial effects that the centering of the bolt can be accurately realized, andthe use of the disc-shaped gasket can be matched to ensure that the bolt is not loosened after fastening.

Description

technical field [0001] The invention belongs to the field of fasteners, in particular to an anti-loosening bolt structure. Background technique [0002] Traditional bolts are widely used to connect the top cover of the hydro-generator to the seat ring foundation, but the traditional bolt structure lacks a reliable anti-loosening structure. Due to the hydraulic vibration of the top cover of the hydro-generator during operation, it is more likely to cause loosening of the connecting bolts of the top cover, resulting in the fatigue and fracture of the bolts in a short time. Russia's Sayano-Shushensk Hydropower Station once had a major accident due to the breakage of the top cover bolts. Chinese patent document CN108496014A disclosed on September 4, 2018 a "device for preventing mining grinder from overflowing and maintaining tightness and tension of fastening bolts", which maintains the seal around the bolts used to protect the mining liner, thereby Keeping the bolt in tensio...

AI Technical Summary

Problems solved by technology

Although this scheme proposes the use of one or more pairs of butterfly washers to increase the friction and improve the loosening effect, but due to the clearance fit between the bolt and the bolt holes of the two workpieces, even in the tightened state, the bolt The axis and the bolt hole axis of the two workpieces often do not coincide with each other, and the bolts cannot be centered, resulting in the contact surface between the nut and the disc washer, the contact surface between the two disc washers, and the contact surface between the disc washer and the workpiece. The distribution of friction force on the contact surface must be uneven, which is the root cause of the bolt loosening under the action of external vibration

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