Southwest Petroleum University

Meishan Crrc Fastening System Co., Ltd

Xia Wang

Yi Zhou

Tong Xu

Yi Tang

Yueming Zheng

Yuxing Huang

Yang Xiao

Bin Tan

Yu Liu

Xu He

Kai Fu

Guangcheng Dai

Yunlong Jia

Song Peng

Yong Wan

Xiong Zhang

Xinrong Li

A vertical high-speed testing device for a spiral seal of a cone bit bearing is provided. The device includes an upper fixed plate, a liquid cylinder, a cone, a spiral sleeve, a shaft and a lower fixed plate. The spiral sleeve is in threaded connection to the cone. Both the cone and the spiral sleeve are sheathed on the shaft. Sealing threads are provided on an inner surface of the spiral sleeve, and there is a clearance between the sealing threads and the shaft. By the testing device, a spiral seal structure for a cone bit bearing is simulated, and the cone drives the spiral sleeve to rotate; and the sand draining performance of the spiral seal is tested by measuring the time required to drain sand-containing medium.

Vertical high speed testing device for spiral seal of cone bit bearing

A horizontal high-speed testing device for a spiral seal of a cone bit bearing is provided. The device comprises a shaft, a spiral sleeve and a cone. The spiral sleeve is in threaded connection to the cone. Sealing threads are provided on an inner diameter of the spiral sleeve. Both the spiral sleeve and the cone are sheathed on the shaft. By the testing device of the present invention, a spiral seal structure for a cone bit bearing is simulated, and the cone drives the spiral sleeve to rotate; the sand draining performance of the spiral seal can be tested in two ways, i.e., by measuring the time required to drain the sand-containing liquid and by measuring the weight of drained sand, so that the smooth production and application of spiral seal products can be assured.

Horizontal high speed testing device for spiral seal of horizontal cone bit bearing

Provided is a single-groove and short-tail pulling rivet and an erection method thereof, and the pulling rivet comprises a single groove and a short tail having a broached groove with a continuous and smooth cambered surface, and is characterized by easy manufacturing, low cost and convenient erection. The broached groove is an arc surface with three sections of different radiuses, which solves stress concentration and sticking of a single-groove and short-tail rivet during riveting, and allows a claw of a riveting machine to be engaged to the best position automatically. The tooth profile of a locking groove section of the rivet is a curve combining an arc and a straight line, which greatly improves fastening force. In a word, the invention solves insufficient clamping degree of the short tail, seizing during riveting, blocking of the broached groove, failed riveting, shortage and loss of tightness of existing short-tail pulling rivets, and meets the performance and reliability requirements of the fastening systems for rolling stocks.

Single-groove and short-tail pulling rivet and erection method thereof

Growing community of inventors

Sichuan, China

Xia Wang