SU1539305A1 - Roller-type drill bit - Google Patents

Abstract

The invention relates to a rock cutting tool. The goal is to increase the life of the bit by providing forced circulation through the support of the washing fluid and grinding the mechanical impurities contained in it. The roller bit contains paws 1 with pins 2, cones (W) 3, mounted on pins 2 by means of wear-resistant sleeves (C) 4, 5 and 8 fixed to W 3. At B 4, 5 and 8, intersecting grooves 6 are made at an angle to mutually contacting surfaces (VP) 7. Fixed in 8 on the inner end 9 of Sh 3, in contact with the ends 10 and 11 of 4 and 5. Forms In 8 a cavity 12 between the inner end of 9 Sh 3 and the end of 13 C 2. Grooves 6 on B 4, 5 and 8 are connected with the through longitudinal channel 14 of the trunnion 2. Material B 4, 5 and 9 are silicon carbide. During the rotation of W 3, the drilling fluid through the grooves 6 is forcibly moved along VP 7 and through cavity 12 and channel 14 exits. The VP 7 is cooled and lubricated. Highly hard silicon carbide crushes mechanical impurities. The positive effect is to exceed the durability of the bit support over the durability of the arms of its cones. 2 Il.

Description

The invention relates to a rock-breaking tool, namely to the structures of the bearings of the roller cone bits, and can also be applied in all parts of the national market.

slides operating in an abrasive-containing environment.

The goal is to increase the life of the 1P bit by providing forced circulation through the support of the washing liquid and grinding the mechanical impurities contained in it.

5 and 8, when the cutter j rotates, the moving point of intersection of the grooves (by the principle of blunt scissors) beyond the bit through channel 1 of axle 2 moves. Self-removal of large particles from the bit support facilitates self-cleaning of channel 1 with flushing (lubricating and cooling) fluid. Monolithic polycrystalline silicon carbide has a low coefficient of linear (volume) expansion of 0,% at, which allows the suspension of play of the cone on the bit support at

FIG. 1 shows a part of a ball-} 5 assembly and further operation to

buccal chisel, incision; in fig. 2 is a section A-A in FIG. one.

The roller bit contains paws 1 with pins 2, cones 3 mounted on pins 2 by means of a radial sliding bearing consisting of two mounted on the roller 3 and pins 2, respectively, wear-resistant sleeves k and 5 with grooves 6 on mutually contacting surfaces 7, and thrust a bearing consisting of a wear-resistant subframe made in the form of a sleeve 8 fixed on the inner end 9 of the roller cutter 3 and contacting the ends of the 10 and 11 sleeves 4 and 5. The sleeve 8 forms a cavity 12 between the inner end 9 of the roller cutter 3 and the end 13 of the trunnion 2. Grooves 6 on the sleeves C, 5 and 8 are made mutually intersecting at an angle to the generatrix of the mutually contacting surfaces 7 and communicate through the cavity 12 with the through longitudinal channel 1 made in the pin 2. The sleeves 4, 5 and 8 are made of wear-resistant silicon carbide-based material.

Roller bit works as follows.

During the rotation of the roller cutter 3, the drilling fluid in the grooves 6 is forcibly moved along the bearings and through the cavity 12 through the channel 14 goes outside. When this occurs, cooling and lubrication of the contacting surfaces 7 occurs. I

Use silicon carbide in

the quality of the material of the sliding bearing bushings increases their wear resistance, since this material has a hardness of 9.2 on the Mohs scale and even the presence in the drilling flushing fluid of the rock to be destroyed does not violate its working conditions. Large particles get into the grooves of 6 sleeves 4,

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the minimum. When assembling the bit, i.e. assembling a roller cutter with a sleeve and anaph with a sleeve, it is possible to complement them by centering and adjusting the gap between these parts with any material (metal, alloy) by soldering.

The positive effect from the use of the invention consists in the guaranteed excess of the durability of the supports of the bit over the durability (cost) of armament of its cones.

ZOFORMULZ Invention

A roller chisel that contains legs with trunnions, roller cones mounted on trunnions by means of radial slide bearings, each of which consists of two wear-resistant bushings with grooves on mutually contacting surfaces and a thrust bearing mounted on the roller cutter and axle, A sharok fastened at the inner end face and in contact with the end of the trunnion is characterized in that, in order to increase the bit life by ensuring the forced circulation through the washing liquid support and grinding Particles containing mechanical impurities in it, the thrust bearing is made in the form of a sleeve fixed in a roller cone in contact with the ends of the radial-bearing boom and forming a cavity between the inner end of the roller cone and the trunnion end, and e in the trunnion is made through a longitudinal channel, radial bearings are made mutually intersecting at an angle to the striking mutually contacting surfaces and communicate with the channel in the pin

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П 393054

5 and 8, when the cutter j is rotated, the moving junction point of the grooves (according to the blunt scissors principle) is ported out of the bit through channel 1 of pivot 2. Self-removal of large particles from the bit support facilitates self-cleaning of channel 1 with flushing (lubricating and cooling) fluid. Monolithic polycrystalline silicon carbide has a low linear (volume) expansion coefficient of 0,% at, which allows to reduce the backlash of the roller cutter on the bit support at

} 5 assembly and further operation to

the minimum. When assembling the bit, i.e. assembling a roller cutter with a bushing and a yapha with a bushing; it is possible to further center them by adjusting and filling the gap between these parts with any material (metal, alloy) by soldering.

The positive effect from the use of the invention consists in the guaranteed excess of the durability of the supports of the bit over the durability (stability) of the arms of its cones.

ZOFORMULZ Invention

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A roller bit containing paws with trunnions, roller cones mounted on trunnions by means of radial slide bearings, each of which consists of two wear-resistant bushings with grooves on mutually contacting surfaces fixed on a roller cutter and trunnion and consisting of a wear-resistant underlay mounted on the inner end of the cutter and the axle-contacting end, characterized in that, in order to increase the life of the bit by providing forced circulation through the support of the washing liquid grinding of mechanical impurities contained in it, the thrust bearing is made in the form of a sleeve fixed in a roller cone in contact with the ends of the radial bearing in the hammer and forming a cavity between the inner end of the roller cone and the trunnion end, while the axle has a through longitudinal channel, radial bearings are mutually intersecting at an angle to the generators of mutually contacting surfaces and communicate with a channel in the trunnion

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cones and the end of the trunnion, and the bushings are made of silicon carbide.

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FIG. 2

Claims (1)

invention formula Roller cone bit containing paws with trunnions, roller cones mounted on trunnions using radial plain bearings, each of which consists of two wear-resistant bushings fixed to the roller cone and trunnion with grooves on mutually contacting surfaces and a thrust bearing, consisting of a wear-resistant thrust bearing mounted on the inner end of the roller cone and a pin in contact with the end face, characterized in that, in order to increase the bit resource by providing forced circulation through the support of the washing liquid and method of treating the mechanical impurities contained therein, the thrust bearing is made in the form of a sleeve fixed in the roller cone, in contact with the ends of the radial bearing Eggulok and forming a cavity between the inner roller end and the axle end, while in the axle E1 a through longitudinal channel is made, and the grooves on the bushings of the thrust and radial bearings are made mutually intersecting at an angle to the generatrix of intercontacting surfaces and communicate with the channel in the journal through the cavity between the inner end face of the thrust and radial bearings the cones and the axle end, and the bushings are made of silicon carbide.