CN2329756Y

CN2329756Y - Big diameter multi-bit combined drilling tool

Info

Publication number: CN2329756Y
Application number: CN 98202606
Authority: CN
Inventors: 胡定成; 赵青山; 张贵端; 朱国祥; 何建华
Original assignee: Railway Construction Research & Design Inst
Current assignee: Railway Construction Research & Design Inst
Priority date: 1998-03-24
Filing date: 1998-03-24
Publication date: 1999-07-21
Anticipated expiration: 2008-03-24

Abstract

The utility model relates to a Big diameter multi-bit combined drilling tool, which is composed of a drill stem, a center shaft, a centre gear, more than one intermediate gear, more than one planetary gear, a casing, more than one planetary bit, and a center bit. The intermediate gears and the planetary gears are all arranged on the sealed casing by bearings. When the drill stem drives the central shaft to rotate, the center gear drives the planetary gears and the planetary bits to spin. At the same time, the intermediate gears and the planetary gears form revolution torsion by force applied to the casing by gear shafts. Under the function of the revolution torsion, the casing does revolution motion. The utility model has the advantages of simple structure, high drilling speed, and wide applicability.

Description

A kind of many drill bits of major diameter way-type drilling unit

The utility model relates to a kind of drilling tool, and especially a kind of many drill bits of major diameter way-type drilling unit that carries out bore operation in the stratum can be widely used in engineering constructions such as well, drilled pile basis, vertical shaft for mine.

The application of major diameter drilling engineering is very extensive, and large diameter drill hole pile is more and more in the bridge engineering, and maximum gauge has reached 4.0M at present, and the maximum drilling diameter of boring method shaft building can reach 8.0M in the field of mining.Main at present employing major diameter conventional bit carries out creeping into of major diameter well, and this requires rig must be equipped with powerful power.And, then be difficult to satisfy construction needs than the major diameter wellhole for small-power, little torque apparatus.And when adopting conventional major diameter drill bit, the movement locus of cutting element is a series of concentric circles, and the linear velocity at bit central and edge differs greatly, and cutting speed is slow, and tool wear is extremely inhomogeneous.

The cutting pattern that the RRC of Japan and TRC series diving drill machine adopt the rotation of many drill bits, revolution has realized the cycloid motion of cutting edge.But the rotation of drill bit in these two kinds of rigs, revolution mechanism are very complicated, and can only fuse with the diving drill machine main frame, and complete machine is very huge, promptly reaches 23 tons as host machine part weight in the hole of TRC-30 type diving drill machine.Once manufactured experimently multi-bit drilling tool at coal industry, but its rotation is opposite with the revolution direction, the edge drill lip cutting linear velocity of well is low, has influenced drilling effect, and the not sealing of the transmission mechanism of drilling tool, and application life is low.

The purpose of this utility model is that a kind of rotation and revolution motion that can the revolution that drilling rod is single resolves into the planet drill bit will be provided, and rotation is identical with the revolution direction, can reduce the power consumption of creeping into, and improves many drill bits of major diameter way-type drilling unit of rate of penetration.

The purpose of this utility model is achieved in that a kind of many drill bits of major diameter way-type drilling unit, by drilling rod, central axis, central gear, more than one Jie's gear, more than one planetary gear, housing, more than one planet drill bit, center bit is formed, described drilling rod links by joint and central axis, central gear is installed on the central axis, central gear is meshed with Jie's gear on being installed in Jie's gear shaft, the gear of giving an account of be meshed with planetary gear on being installed in planet pin, above-mentioned center bit and central axis link, planet drill bit and planet pin link, described central axis, Jie's gear shaft and planet pin link by means of bearing and housing.

The utility model has the advantages that: can with the supporting use of any rotary rig, simple in structure, wide adaptability, because the rotation and the revolution motion of planet drill bit are resolved in the revolution that drilling rod is single, and rotation is identical with the revolution direction, thereby reduced the power consumption of creeping into, improved rate of penetration.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is the cross-sectional schematic according to a kind of many drill bits of the major diameter way-type drilling unit that the utility model proposes;

Fig. 2 is along the generalized section of A-A line among Fig. 1;

Fig. 3 is the movement locus figure according to a kind of many drill bits of the major diameter way-type drilling unit drill lip that the utility model proposes.

Below in conjunction with accompanying drawing and most preferred embodiment thereof the concrete structure that the utility model proposes is further described.

As shown in Figure 1, 2, the major diameter multi-bit drilling tool that the utility model proposes is made up of drilling rod 1, central axis 2, central gear 3, more than one Jie's gear 4, more than one planetary gear 5, housing 6, more than one planet drill bit 7, center bit 8.Described drilling rod 1 links by joint 11 and central axis 2, central gear 3 is installed on the central axis 2, central gear 3 is meshed with Jie's gear 4 on being installed in Jie's gear shaft 10, the gear of giving an account of 4 be meshed with planetary gear 5 on being installed in planet pin 12, above-mentioned center bit 8 links with central axis 2, and planet drill bit 7 links with planet pin 12.Described central axis 2, Jie's gear shaft 10 and planet pin 12 link by means of bearing 9 and housing 6, can rotate freely thereby make between housing 6 and the central axis 2.

During drilling tool work, drilling rod 1 drives central axis 2 revolutions by joint 11, and central axis 2 drives 7 rotations of planet drill bit by central gear 3, Jie's gear 4 and planetary gear 5; Meanwhile, Jie's gear 4 and planetary gear 5 apply tangential force by its gear shaft to housing respectively, described tangential force forms a revolution moment of torsion M who acts on the housing 6, because housing 6 can rotate freely with respect to central axis 2, produce revolution motion at revolution torsional interaction lower house 6, the direction of motion of rotation and revolution is consistent.The movement locus of drill lip is outer trochoid, as shown in Figure 3.For making drilling tool have good working performance, the ratio that should make central gear and planetary radius is 1.5～2.5.

Claims

1. many drill bits of major diameter way-type drilling unit, it is characterized in that: described drilling tool is by drilling rod, central axis, central gear, more than one Jie's gear, more than one planetary gear, housing, more than one planet drill bit, center bit is formed, described drilling rod links by joint and central axis, central gear is installed on the central axis, central gear is meshed with Jie's gear on being installed in Jie's gear shaft, the gear of giving an account of be meshed with planetary gear on being installed in planet pin, above-mentioned center bit and central axis link, planet drill bit and planet pin link, described central axis, Jie's gear shaft and planet pin link by means of bearing and housing.

2. many drill bits of major diameter way-type drilling unit according to claim 1 is characterized in that: described central gear and planetary radius ratio are 1.5～2.5.