SU52089A1 - Electric drill rod - Google Patents

Description

When drilling an electric drill1 1I vertical wells in wet, mostly carbonate, rocks in quarries of building materials, braking of the electric motor often occurs due to the significant resistance of the wet drill flour to the rotation of the rod.

Due to this, a well, a core drill drill, can rarely be brought to a depth exceeding 0.6-1.0 m. In the case of a manual drill, when deepening by 0.3-0.5 m, it becomes impossible to hold the drill in hand due to the strong reactive effort.

The change of the rods (to a longer one) in the case of drilling with a core drill can be made after cleaning the squib from the drilling flour. In most cases, the rods and cutter are at the same time so firmly wedged in the borehole drilling mud that to extract them takes several times more time than the drilling itself.

The use of water washing is inconvenient in winter and extremely difficult due to the strong hygroscopicity of ammonites. Overload electric motors in sam.m not

long time out of operation. In addition, many accidents occur from the contact of the hands or clothing of workers with rotating spiral schanga.

The proposed rod, in order to eliminate the aforementioned deficiencies, is made of two main parts - from the inner rotatable spiral part and the outer non-rotatable tubular part, participating only in the forward movement. The outer part is provided with windows for the falling out of the drilling mud and a pointed shoe.

The use of the proposed bar eliminates the loss of power in overcoming the friction resistance of the rotating barb on the borehole rock walls, reduces the resistance to sludge movement that occurs when drilling with a conventional bar due to the friction of the bar thread on the one hand against the metal of the rotating bar, on the other hand in the proposed rod, the inner surface of the pipe is replaced. As a result, the discharge of sludge from the hole is improved and increases, firstly, my wash is useful, it is spent directly on drilling,

and, secondly, the depth of drilling is possible.

In FIG. 1 shows a vertical section through a rod for a hand drill; FIG. 2 - the same for core drill.

In the case of a hand drill (Fig. 1), the rod is fastened to the drill 7 by means of a transition cone 3 screwed onto the sleeve 2 fixed on the narrowed part of the drill. A cone 3, provided with a window 4 for falling out of the drilling mud, is connected to an outer thin-walled non-rotating tubular part 3 carrying a pointed shoe 7 at the end, having a diameter slightly smaller than the diameter of the drill. The inner surface of part 5 may be smooth or have grooves along the generator of the cylinder or at a certain angle to it. The internally rotating helical part 6 of the rod carries the cutter 8.

With a core drill, a rhombic JO part of the shank of the inner spiral part / 5 shtangi, cylindrical part 2 of which is located in the thrust ball bearing, is inserted into the chuck 9 drill, mounted on the spindle having a differential feed, the cylindrical part 2 of which is located in the thrust ball bearing //. The rods / 5 are placed under the latter, moving along any guides. Their purpose is to prevent the rotation of the outer tubular part / 5, providing it with free translational motion. Portion / 5 is provided with a window J4 for dropping the drilling mud.

The outer parts 5, / 5 do not rotate, participate only in translational motion, and the internal 6 and 6 rotate from the spindle of the drill. Mud flour moves inside the outer parts 5, 15 to the windows 4, 14, from where it falls under the influence of strength and centrifugal force.

The use of a double rod stops arbitrary expansion of the hole, and the fact that the rotating helical part of the rod is enclosed in a fixed pipe, ensures complete safety of work during drilling.

The subject matter of the invention.

A rod for an electric drill, characterized in that, in order to reduce the resistance of friction during its rotation against the walls of the hole during drilling, it is made of two main parts: an internal rotating spiral part 6 (Fig. 1) or 16 (Fig. 2) and an outer a non-rotating tubular portion 5 or / 5 provided with a pointed shoe 7 and a window 4 or 14 for falling out of the drilling meal.