SU1574786A1 - Locking connection of drilling rods - Google Patents

Abstract

The invention relates to mining technology and is intended for drilling blast holes in open pit mining. The purpose of the invention is to increase the operability of the lock joint by reducing the longitudinal loads during screwing and unscrewing. The connection includes a nipple 1 with a stop end 2 and an external thread 3 and a coupling 4 with a counter stop end 5 and an internal thread. The nipple 1 is made of two telescopically connected and installed with the possibility of limited axial movement of the elements. Each of the elements has interconnected surfaces: profile for transmitting torque, smooth for centering. In this case, the end face 2 is located on the outer element, and the external thread 3 on the inner element. The thrust ends of the nipple 1 and the coupling 4 is made in the form of conical mating surfaces. In the process of screwing and unscrewing, the torque from the rod 7 to the nipple 1 is transmitted when the surfaces of the elements interact. The centering of the two screwed rods is accomplished by the interaction of the ends 2 and 5. 1 Cp f-ly, 4 ill.

Description

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The invention relates to mining equipment, mainly to self-propelled drilling machines for drilling blast holes in open pit mining.

The aim of the invention is to improve the locking ability of the locking joint by reducing the longitudinal loads during screwing and unscrewing.

FIG. I shows the drill rod rod with locking connection, general view; in fig. 2 - locking connection of drill rod rods at the beginning of the screwing process; in fig. 3 - the same, after the end of bolting; in fig. 4 shows section A-A in FIG. 2

The lock connection of the drill rod rods includes a nipple 1 with a stop end 2 and an external thread 3 and a sleeve 4 with a stop end 5 and an internal thread 6. The nipple and sleeve are attached, for example, by welding to the rod 7 of the drill stem by welding. The nipple is made of two telescopically connected elements 8 and 9, which are installed with the possibility of limiting axial movement. The elements 8 and 9 (of which the first is outer and the second is inner), have an interoperable profile (e.g., hexagonal) surface 10 for transmitting torque, as well as a smooth surface 11 for centering. The thrust end 2 is located on the outer element 8, and the thread 3 is on the inner element 9. The thrust ends 2 and 5 can be made in the form of mating conical surfaces (Fig. 2 and 3). At the upper end of the inner element, for example, a nut 12 with a stop 13 is installed on the thread. In the free state, the inner element 9 has the possibility of limited axial movement. This movement, with the upper position of the inner element, is limited by the interaction of the lugs 14 and 15, and at the lower position by the interaction of the lugs 13 and 16.

The lock connection of the rods when assembling a drilling rod is screwed as follows.

Preliminary, the rods are brought together to the contact of the end faces 5 and 2. In the interval of movement of the rods, the LIT1 act of the threads of the inner elements of the i-sang 1 and the coupling 4, and the inner element 1) rises (Fig. 2). When lifting Yesherkh, threads 6 and 3 are tested. A juvenile load arising only at the mass of the inner element, which, as applied to the rods of the drilling rig L LtjllI-200H, is within 50 kg, which is significantly less than the weight of the entire bar. Then, screwing is performed by rotating one of the rods. The thread of the 6 t coupling is not through the counter thread of the 3 rod until the lugs 13 and 16 are aligned, i.e. until the end of the screwing process. There is no need for forced and synchronous axial feeding of one of the rods during the screwing process.

In the process of screwing and unscrewing, the torque from the rod to the nipple is transmitted by the interaction of the profiled surfaces 10 of the inner and outer elements, and the centering of the two screwed rods is carried out by the interaction of the conical thrust ends 2 and 5 of the nipple and the coupling.

Unscrewing is done in reverse order. When rotating one bar relative to another element 9 goes inside

0 of the element 8 and is moved a distance corresponding to the moment the thread leaves the engagement. Then one of the rods is retracted without any synchronization of the axial movement to the position of the exit of the threaded part beyond the limits of the coupling 4.

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Thus, due to a significant reduction in the longitudinal loads on the threads, especially in the initial period when screwing and in the final period when unscrewing, their wear is greatly reduced. This also contributes to the elimination of the need to synchronize the axial feed of the rod when screwing-unscrewing.

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Claims (2)

1. A lock joint of a drill rod rod, including a nipple with a stop end and an external thread and a coupling with a counter stop face and an internal thread, characterized in that the nipple is made of to increase the performance of the lock joint by reducing longitudinal loads during screwing and unscrewing. two telescopically connected and installed with the possibility of limited axial movement of elements, each of which has interleaved profile - for transmitting the torque omenta smooth and - for centering surface, wherein the thrust face is located on the outer pin element and the outer thread - for the inner. 2. Locking connection according to Claim. 1, characterized in that the thrust ends of the nipple and the coupling are made in the form of conical mating surfaces. FIG. 2 fig.Z Fig.b