RU1813166C - Knock-down drill bit - Google Patents

Abstract

Usage: rock cutting tool for drilling large diameter shafts of boreholes with the advantage of a turbo-jet method. Essence: there are recesses at the upper end of the sleeve, the inclination of which is identical to the inclination of the threads on the housing. There are bolts on the perimeter nut. The ends of the bolts are located in the recesses. The paws have outer surfaces tapered to the shanks, and the sleeve has a mating inner counter surface. The latches can be inserted in the bidet of the rod or under the loaded wedges, shzriko a. segments. The number of grooves can be twice as large as the number of shanks. 2 s.p. fs, 3 ".

Description

The invention relates to drilling equipment, in particular to rod-cutting tools, and is pre-applied for use in drilling shafts of mines and boreholes of large diameter, mainly in a turbo-jet manner.

The purpose of the invention is to increase the working efficiency of the bit by increasing the reliability of fastening the legs and compensating for the wear of their outer surfaces.

The invention is illustrated in the drawings.

On Fig, 1 shows a General view of a collapsible drill bit Tarakanov; FIG. 2 is a section AA in FIG. 1; Fig. 3 is an embodiment of a lock in the form of spring-loaded wedges.

The collapsible drill bit contains a housing f, in the through grooves 2 of which are the legs of the legs 3 with cones fixed on them 4. The external beveled surfaces of the legs 3 are surrounded by the conical surface of the sleeve 5, which is provided with a latch 6, movably mounted in

a longitudinal groove 7 of the housing 1. Above the sleeve 5 on the housing 1, a threaded nut 8 is installed, in the threaded holes of which there are bolts 9, the ends of which interact with the slope (bottom parts of the recesses 0 made at the upper end of the bushings 5.

The direction of inclination of the bottom parts of the recesses 10 is identical to the direction of inclination of the threads on the housing 1.

The lock can also be made in the form of wedges (balls) 11, mounted using springs 12 in the recesses 10, made on the upper end of the bushings 5,

The number of grooves 2 in the housing 1 can exceed the number of installed cones two or more (but a multiple of an integer) times.

The bit works as follows.

When drilling, the bit makes a planetary movement and at the pressure of the cones 4 on the bottom there is a significant vibration of the device, initiating the spontaneous movement of the nut 8 along the thread

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of the housing 1. In this case, the twisting of the nut 8 is prevented by the bolts 9, which, resting on the bottom surface of the recesses 10 in the sleeve 5, press the latter against the shanks of the legs 3.

When the nut 8 is spontaneously screwed onto the body 1, the sleeve 5 is pressed by the nut 8 along the end of the sleeve, and since the sleeve 5 has a latch 6 that allows it to move only along the axis of the bit, the paw shanks 3 are pressed against the bit body.

In the case of a lock in the form of spring-loaded wedges, balls or segments (Fig. 3), when the nut 8 is spontaneously screwed onto the housing 1, it is transmitted to the wedge (ball, segment) 11, which compresses the spring 12 and transfers force to the end face of the sleeve 5. nuts 8 a wedge (segment, ball) 11 under the action of a spring moves in the recess 10 and, perceiving the force, transfers it to the sleeve 5.

Thus, any possible movement of the nut 8 ensures the reliable fixation of the shanks of the legs 3, while the movement of the nut 8 during the operation of the bit is possible only in the event of wear of their outer surfaces, therefore, wear compensation is also performed at the same time.

When the grooves 2. in which the shanks of the legs 3 are installed, are worn, the bit is disassembled and the legs 3 are installed in the reserve grooves.

The proposed design of the bit allows the use of its body from 20 to 30 times (change sets of cones).

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The formula of the invention

Claims (3)

1. A collapsible drill bit comprising a threaded body with grooves, legs with shanks installed in the grooves of the body, cones attached to the legs, a sleeve mounted on the body to interact with the outer surface of the shanks, a threaded nut mounted on the body above the sleeve, and a paw lock attached to the shanks, characterized in that, in order to increase the efficiency of the bit by increasing the reliability of the paws fastening and compensate for the wear of their outer surfaces, it is equipped with a lock in the form of a hook threaded bolts mounted on the nut along its perimeter, the ends of which are located in recesses with inclined bottom parts, made on the upper side of the sleeve, with a latch mounted to interact with the sleeve, the direction of inclination of the bottom parts of which is identical to the direction of inclination of the threads on the body, the leg is made with the outer surface chamfered to the shank, and the sleeve with the reverse, chamfered surface of the shanks, chamfered inner surface. 2. The bit according to claim 1, with respect to the fact that the lock is made in the form of a rod or spring-loaded wedges, balls, segments located in the recesses of the sleeve. 3. The bit according to claim 1. This is due to the fact that the body is made with grooves, the number of which exceeds twice the number of paw shanks. 1 Editor Fig.Z Compiled by R, Cockroaches Tehred M. Morgent Proofreader N. Gunko