Inward-concave flat-inserting type drill rod joint

Abstract

The invention relates to an inward-concave flat-inserting type drill rod joint. The drill rod joint is composed of rod body inserting sections of drill rods, a sealing washer, and fastening devices connected with the drill rods. Each of the inserting sections is formed by cutting a section of a profile made of the same material of a triangular arc convex edge drill rod; the inserting sections canbe inserted into rod bodies of the drill rods and are welded and connected with the rod bodies into a whole; and the sealing washer used for sealing is placed between rod body joints of the two drillrods which are in butt joint through the inserting sections. The middle portions of the three side walls of the end portions of the rod bodies of the two drill rods which are connected with each otherare applied pressure inwards to enable the middle portions to be concave inwards, the fastening devices connected with the drill rods are welded to the concave portions respectively, and each fastening device is formed by connecting a nut, a bolt and a sleeve. The three bolts are respectively inserted into the three sleeves by using an internal hexagonal wrench and then are uniformly screwed withthe corresponding nuts, so that the connection operation of the two drill rods is completed.

Description

technical field [0001] The utility model relates to an inwardly concave flat insertion drill pipe joint, which belongs to the technical field of mining equipment. Background technique [0002] At present, the domestic triangular arc convex drill pipe has been widely used in major mining areas in China due to its strong gas emission capacity, low rotation resistance, and fast drilling speed. shape, and the joint is a pipe thread with a taper, which forms the special structural characteristics of the drill pipe; in the past, the technical structural characteristics of the triangular arc convex edge drill pipe are generally used: the use of a pipe thread joint with a taper (Including male and female pipe thread joints with internal thread and external thread) and the two ends of a section of drill pipe profile are welded and integrated after plugging; the above-mentioned drill pipe produced by this technical scheme fully retains the The pipe thread joint characteristics (form)...

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned drill pipes produced by using the above-mentioned tapered pipe thread joints require more raw materials and a large amount of lathe processing, no matter the production technology of friction welding or pressure forming is used to varying degrees. The common defects of complex manufacturing process, long production cycle and high manufacturing cost. Therefore, in order to eliminate the above-mentioned technical defects (disadvantages), it is necessary to find another way to change the traditional design ideas of pipe threaded joints. The threaded joints are completely subverted and discarded, and then a new design (technical means) can be used to fundamentally eliminate the above-mentioned technical defects (disadvantages)

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