Polygonal pyramid quick-plugging sealed auger stem

Abstract

The invention relates to an auger stem, belongs to the field of mechanical equipment of coal mines and particularly relates to a polygonal pyramid quick-plugging sealed auger stem. The polygonal pyramid quick-plugging sealed auger stem comprises a pin end, a box end, a stem body, a spiral fin and a U-shaped connecting pin, wherein the U-shaped connecting pin adopts the structure that a U-shaped short side is buried into an auger stem joint, so the barrier to the discharge of drilling cuttings is reduced; threads are processed on a long side and are fixed by a lock nut; compared with a single pin body, the U-shaped connecting pin is strong in tension resistance; longer circular beads are arranged at two axial ends of a polygonal pyramid matched surface of the pin end and the box end, so a centralized stress point of the stem is dispersed, and the integral bend resistance of the stem is improved; a sealing groove provided with an O-shaped sealing ring is arranged on the surface of the circular bead at the end part of the pin end, so that the steam has a sealing function. The auger steam can be used for drilling, and the demand of a wet type auger drilling process on the steam is met.

Description

technical field [0001] The invention relates to an auger drill rod, which belongs to the field of coal mine machinery and equipment, in particular to a multi-pyramid quick-plug sealing type auger drill rod. Background technique [0002] The drilling construction of gas drainage in soft and outburst coal seams has always been a difficult problem that plagues the development of tunnel drilling technology in my country. Usually, auger drill pipes with self-slagging function are used for drilling construction. [0003] There are two types of commonly used auger rods, threaded auger rods and pin-connected auger rods. During the drilling process, the threaded helical drill pipe cannot be reversed, and the ability to deal with in-hole accidents such as collapsed holes and buried drills is poor. The bolt-connected auger pipe is torque-transmitted through plane fit, and the bolt transmits tension to realize the functions of forward and reverse rotation and pulling out of the auger p...

AI Technical Summary

Problems solved by technology

Due to the poor service conditions and complex stress of drill pipes in coal mines, once impurities are trapped in the mating surface of the right prism, it is difficult to plug and unplug. The demand for drill pipes; the elastic U-shaped connecting pins only rely on the elastic tension between the pin legs to be fixedly connected with the joints. The obstruction of the chip removal channel is relatively large, which affects the powder discharge of the auger drill pipe, thus restricting the popularization and use of the auger drill pipe

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