CN216517832U

CN216517832U - Rotary drilling tool

Info

Publication number: CN216517832U
Application number: CN202220013194.9U
Authority: CN
Inventors: 屈乐宏; 刘翔; 谢杰
Original assignee: Sunward Intelligent Equipment Co Ltd
Current assignee: Sunward Intelligent Equipment Co Ltd
Priority date: 2022-01-05
Filing date: 2022-01-05
Publication date: 2022-05-13
Anticipated expiration: 2032-01-05

Abstract

The utility model provides a rotary drilling tool. The rotary drilling tool comprises a drilling rod and a drill bit, a joint is arranged at the tail end of the drilling rod, an installation box inserted with the joint is arranged on the drill bit, the joint comprises a first portion and a second portion which are sequentially connected from top to bottom, the installation box comprises a first groove body and a second groove body which are sequentially arranged from top to bottom, the first portion is provided with a cross section A, the second portion is provided with a cross section B, the first groove body is provided with a cross section C, the second groove body is provided with a cross section D, A is C, B is D, A is not B, and C is not D; after the drill rod and the drill bit are inserted, the first portion is matched with the first groove body, and in the two groups of matching, one group is matched with a cylinder, and the other group is matched with a square. The coaxial positioning device is used for coaxial positioning in a cylindrical matching mode, and can reduce the clearance between the installation box and the joint during design, so that the deflection angle is small, and the guiding is good.

Description

Rotary drilling tool

Technical Field

The utility model relates to the technical field of foundation construction equipment, in particular to a rotary drilling tool.

Background

As shown in fig. 1, the end of the drill rod 1 is provided with a joint 3 which is a square head; the drill bit 2 is provided with a mounting box 4, the mounting box 4 is a square box, and in actual use, the mounting box 4 of the drill bit 2 is matched with the joint 3 of the drill rod 1 to transfer torque and downward pressure applied to the drill rod. As shown in fig. 1, the joint 2 is provided with a corner E, as shown in fig. 2, the joint 3 and the installation box 4 have an assembly gap, so that the joint can relatively deflect at a certain angle when transmitting torque, and when the drill rod deflects and bears force, the square head and the square box simultaneously bear torque and bending moment, so that the corner E is concentrated in stress and is superposed and reinforced. In addition, the square head and the square box are positioned and matched by means of the cross section of the square head, and an assembly gap needs to be formed between the square head and the square box, so that deflection between a drill rod and a drill bit is large, and perpendicularity of an ultra-large or ultra-deep pile hole is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a novel rotary drilling tool to solve the problems of large deflection and poor guidance.

The technical scheme of the utility model is as follows: the rotary drilling tool comprises a drill rod and a drill bit, wherein a joint is arranged at the tail end of the drill rod, an installation box inserted with the joint is arranged on the drill bit, the joint comprises a first portion and a second portion which are sequentially connected from top to bottom, the installation box comprises a first groove body and a second groove body which are sequentially arranged from top to bottom, the first portion is provided with a cross section A, the second portion is provided with a cross section B, the first groove body is provided with a cross section C, the second groove body is provided with a cross section D, A is C, B is D, A is not B, and C is not D; after the drill rod and the drill bit are inserted, the first portion is matched with the first groove body, the second portion is matched with the second groove body, and in the two sets of matching, one set of matching is cylindrical matching, and the other set of matching is square matching.

Among the above-mentioned scheme, be used for carrying out coaxial positioning through cylinder complex mode, can reduce the clearance of install bin and joint during the design, make the beat angle less, the direction is good.

The symbol "in a ═ C, B ═ D means that the cross-sectional shape is the same (as if it were circular or square) and a and C can be fitted, B and D can be fitted; the "not equal" numbers in a not equal to B, C not equal to D mean that the cross-sectional shapes are not the same (e.g., one is circular and the other is square).

The cylindrical fit refers to the fit that the cross section is circular; a square fit refers to a fit where the cross section is square.

Preferably, the bottom part of the installation box penetrates through to form a bottom end face, and the joint is attached to the bottom end face to achieve surface contact.

Preferably, the cross section a > the cross section B. The ">" in A > B indicates a comparison of the area sizes of the cross sections.

In a specific technical scheme, cross section A and cross section C are circular, cross section B and cross section D are any one of regular quadrangle, regular pentagon, regular hexagon, regular heptagon and regular octagon, first portion and the cooperation of first cell body cylinder, the square cooperation of second portion and second cell body.

Preferably, each corner on the second portion of the joint is provided with an arc chamfer.

Preferably, the size of cross section C is greater than the size of cross section D, makes first cell body and second cell body junction form heavy platform, first portion with heavy platform cooperation, just the lower terminal surface of first portion with the interior bottom surface laminating of heavy platform realizes the face contact.

In another specific technical scheme, the cross section a and the cross section C are any one of a regular quadrangle, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon; the cross section B and the cross section D are both circular, the first portion is matched with the first groove body in a square mode, and the second portion is matched with the second groove body in a cylindrical mode.

Preferably, the joint further comprises a connecting plate, and the connecting plate is arranged on one side of the first part, which is far away from the second part; the top of the installation box is provided with a top end face, and the lower end face of the connecting plate is attached to the top end face of the installation box to achieve surface contact.

Preferably, each corner on the first portion of the joint is provided with an arc chamfer.

Compared with the related technology, the utility model has the beneficial effects that:

the mounting box and the joint are partially designed to be circular so as to realize coaxial positioning, and the design can reduce the gap between the mounting box and the joint, so that the deflection angle is small and the guide is good;

and secondly, when the drill rod and the drill bit are stressed to deflect, the joint can be in surface contact with the sinking platform, the joint is in surface contact with the bottom of the installation box, or the connecting plate is in surface contact with the installation box to transmit stress, so that the joint and the installation box only bear torque, and the stress concentration at the corner E is weakened.

Drawings

FIG. 1 is a schematic view of an assembly structure of a conventional drill rod and a drill bit;

FIG. 2 is a schematic sectional view taken along line I-I of FIG. 1;

fig. 3 is a schematic structural diagram of a rotary drilling tool according to a first embodiment of the present invention;

FIG. 4 is a schematic diagram of the construction of the drill bit of FIG. 3;

FIG. 5 is a schematic sectional view taken along line F-F in FIG. 4;

FIG. 6 is a schematic sectional view taken along line G-G in FIG. 4;

FIG. 7 is a schematic structural view of the drill rod of FIG. 3;

FIG. 8 is a schematic sectional view taken along H-H in FIG. 7;

FIG. 9 is a schematic sectional view taken along J-J in FIG. 7;

fig. 10 is a schematic structural view of a rotary drilling tool according to a second embodiment of the present invention;

FIG. 11 is a schematic diagram of the construction of the drill bit of FIG. 10;

FIG. 12 is a schematic sectional view taken along line F-F in FIG. 11;

FIG. 13 is a schematic sectional view taken along line G-G in FIG. 11;

FIG. 14 is a schematic structural view of the drill rod of FIG. 10;

FIG. 15 is a schematic sectional view taken along H-H in FIG. 14;

fig. 16 is a schematic sectional view taken along J-J in fig. 14.

In the drawings: 1. a drill stem; 2. a drill bit; 3. a joint; 31. a first part; 32. a second section; 33. a connecting plate; 4. installing a box; 41. a first tank body; 42. a second tank body; 43. sinking a platform; 44. a bottom end face; 45. a boss; 431. an inner bottom surface; 451. a top end surface.

Detailed Description

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.

Example one

As shown in fig. 3, the rotary drilling tool provided by the embodiment includes a drill rod 1 and a drill bit 2, a joint 3 is arranged at the tail end of the drill rod 1, and an installation box 4 inserted into the joint 3 is arranged on the drill bit 2.

As shown in fig. 7, the joint 3 includes a connecting plate 33, a first portion 31, and a second portion 32 connected in this order from top to bottom. The connecting plate 33, the first portion 31 and the second portion 32 are integrally formed.

As shown in fig. 4, the installation box 4 includes a first groove 41 and a second groove 42 sequentially arranged from top to bottom, and the first groove 41 and the second groove 42 are integrally formed. The first portion 31 has a cross-section a (as shown in fig. 8), the second portion 32 has a cross-section B (as shown in fig. 9), the first channel 41 has a cross-section C (as shown in fig. 5), and the second channel 42 has a cross-section D (as shown in fig. 6), wherein a ═ C, B ≠ D, a ≠ B, and C ≠ D.

If the joint and the installation box are inserted from top to bottom, A is larger than B. In other embodiments, if the joint and the installation box are assembled in other manners, a may be a < B, for example, if the installation box is made into a split structure with half-opened, the joint is installed in a horizontal embedded manner, and then the other half of the installation box is installed.

As shown in fig. 4, the bottom of the mounting box 4 is partially penetrated to form a bottom end surface 44, and the second portion 32 of the joint 3 is attached to the bottom end surface 44 to realize surface contact for transmitting pressure force and avoiding the stress on the pin shaft (the pressure force is applied to the connecting pin between the pin shaft stress finger joint and the mounting box).

In this embodiment, as shown in fig. 5, 6, 8, and 9, the cross section a and the cross section C are both circular, the cross section B and the cross section D are both regular quadrangles, or the cross section B and the cross section D may be any one of a regular pentagon, a regular hexagon, a regular heptagon, and a regular octagon. Regular quadrangles, regular pentagons, regular hexagons, regular heptagons and regular octagons are collectively referred to as squares.

As shown in fig. 4, the size of the cross section C of the first slot 41 is larger than the size of the cross section D of the second slot 42, so that a sinking platform 43 is formed at the joint of the first slot 41 and the second slot 42. Similarly, the first portion 31 of the joint 3 is fitted into the first groove 41, the second portion 32 is fitted into the second groove 42, and the cross-sectional dimension of the connecting plate 33 is larger than that of the first portion 31, so that the connecting plate 33 extends beyond the outer side of the first portion 31 (as shown in fig. 7).

As shown in fig. 3, after the joint 3 is inserted into the installation box 4, the first portion 31 and the first groove 41 are in cylindrical fit, and can be coaxially positioned. The lower end face of the first portion 31 is attached to the inner bottom face 431 of the sinking platform 43 to realize surface contact, so that the stress of the pin shaft is avoided, and the stress is transmitted to transfer pressure. The second portion 32 and the second groove 42 are matched in a square mode and used for transmitting torque, so that the second portion 32 only bears the torque, and stress concentration at the corner E is weakened.

In order to facilitate the concentric positioning and guiding, each corner of the second portion 32 of the joint 3 is provided with a circular arc chamfer (as shown in fig. 9).

Example two

Example one is repeated, except that in this example, as shown in fig. 12, 13, 15 and 16, both the cross section a and the cross section C are regular quadrangles; the cross section B and the cross section D are both circular. The first portion 31 is square-fit with the first slot 41, and the second portion 32 is cylindrical-fit with the second slot 42. Similarly, the cross section a and the cross section C may be any one of a regular pentagon, a regular hexagon, a regular heptagon, and a regular octagon.

As shown in fig. 10, 11 and 14, the top of the first groove 41 of the installation case 4 is provided with a horizontally protruding boss 45, and the boss 45 has a top end face 451. The lower end face of the connecting plate 33 is attached to the top end face 451 to realize surface contact, so that pressure is transmitted, and stress on the pin shaft is avoided. Also, this structural design weakens the stress concentration at the corner E.

In order to facilitate the concentric positioning and guiding, each corner of the first portion 31 of the joint 3 is provided with a circular arc chamfer (as shown in fig. 15).

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The rotary drilling tool comprises a drill rod and a drill bit, wherein a joint is arranged at the tail end of the drill rod, and a mounting box inserted with the joint is arranged on the drill bit; after the drill rod and the drill bit are inserted, the first portion is matched with the first groove body, the second portion is matched with the second groove body, and in the two sets of matching, one set of matching is cylindrical matching, and the other set of matching is square matching.

2. The rotary drilling rig according to claim 1, wherein the bottom portion of the mounting box penetrates through to form a bottom end face, and the joint is attached to the bottom end face to achieve surface contact.

3. The rotary drilling rig according to claim 1, wherein the cross section A > the cross section B.

4. The rotary drilling rig according to any one of claims 1-3, wherein the cross section A and the cross section C are both circular, the cross section B and the cross section D are both any one of a regular quadrangle, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon, the first portion is matched with the first groove body in a cylindrical mode, and the second portion is matched with the second groove body in a square mode.

5. The rotary drilling tool according to claim 4, wherein each corner on the second portion of the joint is provided with a circular arc chamfer.

6. The rotary drilling rig according to claim 4, wherein the size of the cross section C is larger than that of the cross section D, so that a sunken platform is formed at the joint of the first groove body and the second groove body, the first portion is matched with the sunken platform, and the lower end face of the first portion is attached to the inner bottom face of the sunken platform to achieve surface contact.

7. The rotary drilling tool according to any one of claims 1 to 3, wherein the cross section A and the cross section C are any one of a regular quadrangle, a regular pentagon, a regular hexagon, a regular heptagon and a regular octagon; the cross section B and the cross section D are both circular, the first portion is matched with the first groove body in a square mode, and the second portion is matched with the second groove body in a cylindrical mode.

8. The rotary drilling rig according to claim 7, wherein the joint further comprises a connecting plate, and the connecting plate is arranged on one side of the first portion, which is far away from the second portion; the top of the installation box is provided with a top end face, and the lower end face of the connecting plate is attached to the top end face of the installation box to achieve surface contact.

9. The rotary drilling rig according to claim 7, wherein each corner on the first portion of the joint is provided with a rounded chamfer.