CN217897750U

CN217897750U - Roller bit with slag discharge hole

Info

Publication number: CN217897750U
Application number: CN202221972923.XU
Authority: CN
Inventors: 黄敏
Original assignee: Suzhou Selecos Tools Co ltd
Current assignee: Suzhou Selecos Tools Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-11-25
Anticipated expiration: 2032-07-28

Abstract

The utility model discloses a roller bit with slag discharge hole, roller bit's main part comprises the welding of multi-disc palm, and the main part upper end is drill bit connecting portion, the palm lower extreme is equipped with the axle journal inwards, stretches out downwards, every all install a gear wheel through bearing mechanism on the axle journal, drill bit connecting portion are hollow structure, and the fumarole is seted up to its inner end and is extended to the inboard side of palm, and compressed air gets into by drill bit connecting portion, jets out through the fumarole to between the gear wheel, form dome structure at main part lower extreme during the palm equipment, the inboard position that is close to the dome of palm is seted up slag discharge hole and is extended to palm outside limit in the slant, and the gaseous partial blowout of fumarole spun forms air current return circuit by slag discharge hole. The utility model discloses a set up the ballast hole in the middle part of the bit leg, let the partial rubble at shaft bottom center from the inside discharge of bit leg, provide a smooth and easy return circuit for partial compressed air, improve ballast removal efficiency to improve drilling speed.

Description

Roller bit with slag discharge hole

Technical Field

The utility model belongs to the technical field of roller bit technique and specifically relates to a roller bit with slag discharge hole.

Background

The roller cone mining drill bit is usually used for blasting and drilling in the process of mining metal ores and coal mines, the main body of the roller cone mining drill bit is formed by welding a plurality of tooth legs, the upper end of the roller cone mining drill bit is provided with threads connected with a drill rod, and the lower end of each tooth leg is provided with a shaft neck extending inwards and downwards. A cone is arranged on each shaft neck, and a steel ball and a roller are arranged between the shaft neck and the inner hole of the cone to form a bearing system. When the bit works, the roller cone revolves around the axis of the bit and rotates around the shaft neck. The top end of the shaft neck is provided with an interference fit thrust block, and the bottom of the inner hole of the cone is also provided with an interference fit thrust block. When the drill bit works, two thrust blocks bear partial axial component of the pressure of the drilling machine on a shaft neck, and the steel balls and the rollers bear radial component. Alloy teeth for crushing rocks are embedded in the outer conical surface of the cone, and air injection holes are designed in the middle lower part of the bit leg. Compressed air generated by the compressor enters the drill bit through the drill rod, and for the sealed drill bit, all the compressed air is sprayed to the bottom of the well from the air injection holes, and rock debris crushed by the roller cone is blown out of the well mouth upwards from the bottom of the well through a gap between the drill rod and the well wall. For non-sealed bits, most of the compressed air is blown to the bottom of the well through the gas injection holes, and the other part of the compressed air enters the bearing through the long gas holes and is used for cooling and lubricating the bearing. Meanwhile, compressed air blown to the bottom of the well through the air injection holes can clean the surface of the cone, and the cone is prevented from being wrapped by silt to influence the drilling speed.

Because the air injection hole on the drill bit is close to the well wall, the broken stone in the center of the well bottom is not easy to be discharged immediately, but moves back and forth among domes formed by assembling the well bottom, the cone and the palm, and is discharged along with compressed air from a gap between the drill bit and the well wall after repeated grinding. Repeated crushing not only reduces the tunneling speed, but also causes unnecessary excessive wear of the cone shell, and after the cone in the soft stratum tunnels for thousands of meters, the excessive wear easily causes the shell to break. In the prior art, in order to improve the slag removal efficiency, a method of removing materials on two sides of a bit leg and increasing a gap between a drill bit and a well wall is mostly adopted, however, the method can not effectively avoid the resistance interference of air inlet of an air jet hole, and can not solve the problem of repeated crushing of a well bottom center.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the not enough of background art, the utility model discloses a roller bit with ballast hole through increase the ballast hole in the middle part of the bit leg, lets the smooth and easy discharge of part rubble from the inside by the ballast hole at shaft bottom center.

The technical scheme is as follows: the utility model discloses a roller bit with slag discharge hole, roller bit's main part comprises the welding of multi-disc palm, and the main part upper end is drill bit connecting portion, the palm lower extreme is equipped with the axle journal inwards, stretches out downwards, every all install a gear wheel through bearing mechanism on the axle journal, drill bit connecting portion are hollow structure, and the fumarole is seted up to its inner end and is extended to the inboard side of palm, and compressed air gets into by drill bit connecting portion, and it jets gas to between the gear wheel through the fumarole, form dome structure at main part lower extreme during the palm equipment, the inboard position that is close to the dome of palm is seted up slag discharge hole and is extended to palm outside limit in the slant, and fumarole spun gas is by the blowout of slag discharge hole, forms air current return circuit.

Furthermore, each tooth palm is provided with an air injection hole and a slag discharge hole, the air injection hole and the slag discharge hole are respectively positioned at two sides of the tooth palm, one side of the air injection hole is injected, and the other side of the air injection hole is injected.

Furthermore, the slag discharge hole and the axis of the drill bit body form an included angle of 45-55 degrees.

Furthermore, the slag discharge hole and the axis of the drill bit body form an included angle of 50 degrees.

Furthermore, the inner end of the drill bit connecting part is also provided with a long air hole, the long air hole extends from the inner side of the bit leg to the outer side of the bearing mechanism, air is sprayed outwards from the bearing, and the distance between the slag discharge hole and the wall of the long air hole is more than or equal to 5mm.

Has the advantages that: compared with the prior art, the utility model has the advantages that: firstly, the utility model discloses an offer the ballast removal hole in the middle part of the bit leg, let some rubbles in the well bottom center discharge from the bit leg inside, provide a smooth and easy return circuit for some compressed air, improve the ballast removal efficiency to improve the drilling speed; secondly, the slag discharging hole of the utility model is positioned near the dome, and the position is just a position which is easy to accumulate slag, so that the slag discharging is more thorough; moreover, the slag discharge holes and the gas injection holes of the utility model are arranged on both sides of the bit leg, so that the air inlet and the slag discharge are not interfered with each other, and a smooth loop is easier to form; finally, the utility model discloses a injecing the pore wall interval of ballast discharging hole and slot hole in the palm of the tooth, preventing that the ballast discharging hole wall from receiving the wearing and tearing of rubble at the ballast discharging in-process, wearing and tearing even leads to two holes to communicate with each other, avoids the detritus to get into the bearing through long gas pocket.

Drawings

Fig. 1 is a three-dimensional sectional view of the present invention;

fig. 2 is a front view of the present invention;

FIG. 3 is a cross-sectional view of a single bit leg of the present invention;

FIG. 4 is a bottom view of FIG. 2 taken along line B;

fig. 5 is a top view of fig. 2 taken along line B.

Detailed Description

The technical solution of the present invention will be further described with reference to the accompanying drawings and examples.

As shown in fig. 1, 2 and 3, the roller cone bit with the slag discharge hole has a main body formed by welding three bit legs 1, the upper end of the main body is a bit connecting part, which is a threaded structure in this embodiment, the lower end of the bit leg 1 is provided with a journal 2 extending inward and downward, each journal 2 is provided with a roller cone 3 through a bearing mechanism, an alloy tooth bit for crushing rock is inlaid in an outer conical surface of the roller cone 3, and during operation, the roller cone 3 revolves around the bit axis and also rotates around the journal 2.

Drill bit connecting portion are hollow structure, and fumarole 4 is seted up to its inner end and extend to the inboard side of bit palm 1, and compressed air gets into by drill bit connecting portion, and it is jet-propelled between 3 to the cone through fumarole 4, the inner of drill bit connecting portion still sets up long gas pocket 5 and extends to the bearing mechanism outside by bit palm 1, and is outwards jet-propelled by the bearing, and most compressed air blows to the shaft bottom through fumarole 4, and another part then gets into the bearing through long gas pocket 5 for cooling and lubricated bearing, blow to the compressed air in shaft bottom through the fumarole simultaneously and can also clean the cone surface, avoid the cone to be wrapped up by silt, influence well drilling speed.

As shown in fig. 3, fig. 4 and fig. 5, the utility model discloses roller bit during operation, wall of a well A is hugged closely to 1 outer wall of bit leg, and only the side leaves few space, form dome structure C at main part lower extreme during the equipment of bit leg 1, this dome position is the position of the most easy accumulated slag promptly, the position that 1 inboard of bit leg is close to the dome sets up slag discharge hole 6 and is 50 contained angles and extend to 1 outside limit of bit leg in the slant with drill bit main part axis, and 4 spun gases of fumarole are by the blowout of slag discharge hole 6, form the air current return circuit.

Each of the bit legs 1 is provided with an air jet hole 4 and a slag discharge hole 6, the air jet hole 4 and the slag discharge hole 6 are respectively positioned at two sides of the bit leg 1, one side of the air jet hole is sprayed in, the other side of the air jet hole is sprayed out, and the air jet hole 4 is not interfered by the air inlet resistance of the air jet hole 4 during slag discharge.

In order to avoid excessive abrasion of broken stones on the wall of the hole and damage to the internal structure during slag removal, the distance between the wall of the slag removal hole 6 and the wall of the long air hole 5 is more than or equal to 5mm, the diameter of the slag removal hole is designed according to the space of the bit leg and the size of the broken stones, and if the space of the bit leg is enough, the aperture is set to be 20-28mm.

Claims

1. The utility model provides a roller bit with slag discharge hole, roller bit's main part comprises multi-disc bit leg (1) welding, and the main part upper end is drill bit connecting portion, bit leg (1) lower extreme is equipped with inside, journal (2) that stretch out downwards, every all install a cone (3) through bearing mechanism on journal (2), drill bit connecting portion are hollow structure, and fumarole (4) and extend to the inboard side of bit leg (1) are seted up to its inner end, and compressed air gets into by drill bit connecting portion, spouts its characterized in that to between roller bit (3) through fumarole (4): when the bit leg (1) is assembled, a dome structure is formed at the lower end of the main body part, a slag discharge hole (6) is formed in the position, close to the dome, of the inner side of the bit leg (1) and extends obliquely upwards to the outer side of the bit leg (1), and gas sprayed out of the gas spraying hole (4) is sprayed out of the slag discharge hole (6) to form an airflow loop.

2. The roller cone drill bit with a ballast draining hole according to claim 1, wherein: each tooth palm (1) is provided with an air injection hole (4) and a slag discharge hole (6), the air injection hole (4) and the slag discharge hole (6) are respectively positioned at two sides of the tooth palm (1), one side of the air injection hole is injected, and the other side of the air injection hole is injected.

3. The roller cone drill bit with a ballast draining hole of claim 1, wherein: the slag discharge hole (6) and the axis of the drill bit body form an included angle of 45-55 degrees.

4. The roller cone drill bit with a ballast draining hole according to claim 3, wherein: the slag discharge hole (6) and the axis of the drill bit body form an included angle of 50 degrees.

5. The roller cone drill bit with a ballast draining hole of claim 1, wherein: the inner end of the drill bit connecting part is also provided with a long air hole (5), the long air hole extends from the inner part of the bit leg (1) to the outer side of the bearing mechanism, air is sprayed outwards from the bearing, and the distance between the slag discharge hole (6) and the wall of the long air hole (5) is more than or equal to 5mm.