CN216588477U

CN216588477U - Rotary drilling tool

Info

Publication number: CN216588477U
Application number: CN202220013447.2U
Authority: CN
Inventors: 刘翔; 屈乐宏; 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: 2022-05-24
Anticipated expiration: 2032-01-05

Abstract

The utility model provides a dig drilling tool soon. The rotary drilling tool comprises a drill rod and a drill bit, wherein the tail end of the drill rod is provided with a joint, the drill bit is provided with an installation box, the joint is a square head with n plane enclosure, and n is a natural number greater than 4; m inner wall surfaces are arranged in the installation box, the m inner wall surfaces correspond to the n planes one by one, each inner wall surface comprises an assembly surface and a torsion transmission surface, the torsion transmission surface is connected to one end of the assembly surface, and the torsion transmission surface is obliquely arranged and forms an acute angle alpha with the assembly surface; the joint and the installation box are respectively provided with a first state and a second state after being assembled: in a first state, the assembling surface is parallel to the plane and arranged at intervals; in the second state, the flat surface is in surface contact with the torque transmission surface. The utility model discloses realize the face contact transmission, the stress concentration of greatly reduced contact position, the life of drilling tool is dug in the extension.

Description

Rotary drilling tool

Technical Field

The utility model relates to a basic construction equipment technical field especially relates to a dig drilling tool soon.

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 a joint of the drill rod 1 to transfer torque and downward pressure applied to the drill rod. As shown in fig. 2, due to the existence of the assembly gap between the joint 3 and the mounting box 4, the relative deflection is caused by a small angle when the torque is transmitted, so that the mounting box 4 and the joint transmit the torque through line contact, and stress concentration and damage at the contact position of the mounting box and the joint are easily caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel dig drilling tool soon to solve the install bin and connect the stress concentration of line contact position, surrender wearing and tearing, each atress is inhomogeneous, causes the inhomogeneous and local problem that damages of wearing and tearing.

The technical scheme of the utility model is that: a 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 is a square head with n planes, and n is a natural number larger than 4; m inner wall surfaces are arranged in the installation box, the m inner wall surfaces correspond to the n planes one by one, each inner wall surface comprises an assembly surface and a torsion transmission surface, the torsion transmission surface is connected to one end of the assembly surface, and the torsion transmission surface is obliquely arranged and forms an acute angle alpha with the assembly surface; the joint and the installation box are respectively provided with a first state and a second state after being assembled: in a first state, the assembling surface is parallel to the plane and arranged at intervals; in the second state, the flat surface is in surface contact with the torque transmission surface.

In the above scheme, when the torque is transmitted between the drill rod and the drill bit, the plane on the joint is attached to the torque transmission surface on the installation box to realize surface contact transmission, so that the stress concentration of the contact position is greatly reduced, and the service life of the rotary drilling tool is prolonged.

Preferably, the torque transmission surface is inclined in the direction of rotation of the drill rod.

Preferably, the m inner wall surfaces in the installation box are rotationally symmetrical along the center of the installation box.

Preferably, in the n planes of the joint, a first chamfer surface is arranged at the corner of each two planes; in m internal wall faces in the installation box, a second chamfer face is arranged at the corner of every two internal wall faces, and the first chamfer face is matched with the second chamfer face.

Preferably, the first chamfer surface and the second chamfer surface are both arc surfaces.

Compared with the prior art, the beneficial effects of the utility model are that: an installation surface is arranged in the installation box, and an assembly gap between the installation surface and the joint is reserved, so that the assembly of the drill rod and the drill bit is facilitated; the installation box is internally provided with a torque transmission surface which can deflect a certain angle relatively when transmitting torque, so that the torque is transmitted in a surface contact manner, the stress concentration of the contact position is greatly reduced, the stress is uniform, the abrasion is reduced, and the service life of a rotary drilling tool is prolonged.

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 A-A of FIG. 1;

fig. 3 is a schematic view of the rotary drilling tool structure provided by the present invention;

FIG. 4 is a schematic cross-sectional view taken along B-B of FIG. 3 and in a first state;

FIG. 5 is a schematic view of the structure of the joint of FIG. 4;

FIG. 6 is a schematic structural view of the mounting box of FIG. 4;

FIG. 7 is a schematic view taken along line B-B of FIG. 3 and showing the structure in a second state.

In the drawings: 1. a drill stem; 2. a drill bit; 3. a joint; 31. a plane; 32. a first chamfer surface; 4. installing a box; 41. an inner wall surface; 411. an assembly surface; 412. a torsion transmitting surface; 42. a second chamfer surface.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, 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.

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. 5, the joint 3 is a square head enclosed by n planes 31, where n is a natural number greater than 4. A first chamfer surface 32 is arranged at the corner of each two planes 31, and the first chamfer surface 32 is an arc surface. In this embodiment, n is 4, and in other embodiments, the linker 3 may be a regular pentagon with n being 5, a regular hexagon with n being 6, a regular heptagon with n being 7, or a regular octagon with n being 8.

As shown in fig. 6, m inner wall surfaces 41 are provided in the mounting box 4, and m inner wall surfaces 41 correspond to n flat surfaces 31 one by one, that is, m is equal to n. The inner wall surfaces 41 matched with the planes 31 are arranged in the installation box 4, second chamfer surfaces 42 are arranged at corners of every two inner wall surfaces 41, the second chamfer surfaces 42 are also arc surfaces and matched with the first chamfer surfaces 32, and the joint 3 and the installation box 4 are in contact through the arc surfaces to be concentrically positioned and guided.

The inner wall surface 41 includes an assembly surface 411 and a torque transmission surface 412, the torque transmission surface 412 is connected to one end of the assembly surface 411, and the torque transmission surface 412 is arranged in an inclined manner in the direction of rotation of the drill rod 1 and forms an acute angle α with the assembly surface 411 (the direction of rotation of the drill rod is clockwise as shown in fig. 7, and the torque transmission surface is inclined at the acute angle α clockwise as shown in fig. 6 and 7). The four inner wall surfaces 41 in the mounting case 4 are rotationally symmetrical about the center of the mounting case 4, so that when the joint 3 is deflected, the four flat surfaces 31 are all in contact with the torque transmission surface 412 (as shown in fig. 7).

The joint 3 is inserted into the mounting box 4 and is assembled to form a first state and a second state respectively: as shown in fig. 4, in the first state, the assembling surface 411 is parallel to and spaced from the plane 31, and in this state, the assembling gap is reserved, which is beneficial to the assembling operation. As shown in fig. 7, in the second state, the plane 31 is in surface contact with the torque transmission surface 412, and the first chamfer surface 32 is in surface contact with the second chamfer surface 42, so that the stress concentration at the contact position can be greatly reduced, and the service life of the rotary drilling tool can be prolonged.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims

1. A rotary drilling tool comprises a drill rod and a drill bit, wherein the tail end of the drill rod is provided with a joint, and the drill bit is provided with an installation box inserted with the joint, and the rotary drilling tool is characterized in that the joint is a square head with n planes, wherein n is a natural number greater than 4; m inner wall surfaces are arranged in the installation box, the m inner wall surfaces correspond to the n planes one by one, each inner wall surface comprises an assembly surface and a torsion transmission surface, the torsion transmission surface is connected to one end of the assembly surface, and the torsion transmission surface is obliquely arranged and forms an acute angle alpha with the assembly surface; the joint and the installation box are respectively provided with a first state and a second state after being assembled: in a first state, the assembling surface is parallel to the plane and arranged at intervals; in the second state, the flat surface is in surface contact with the torque transmission surface.

2. The rotary drilling rig according to claim 1, wherein the torque transmission surface is inclined in a direction of rotation of the drill rod.

3. The rotary drilling rig according to claim 1, wherein the m inner wall surfaces in the installation box are rotationally symmetric along the center of the installation box.

4. The rotary drilling rig according to claim 1, wherein a first chamfer surface is arranged at a corner of each two of the n planes of the joint; in m internal wall faces in the installation box, a second chamfer face is arranged at the corner of every two internal wall faces, and the first chamfer face is matched with the second chamfer face.

5. The rotary drilling rig according to claim 4, wherein the first chamfer surface and the second chamfer surface are both arc surfaces.