CN213654771U

CN213654771U - Reverse circulation reaming core drill

Info

Publication number: CN213654771U
Application number: CN202022351753.0U
Authority: CN
Inventors: 谢伟才; 姚军
Original assignee: Hunan Xinjingang Machinery Equipment Co ltd
Current assignee: Hunan Xinjingang Machinery Equipment Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-07-09
Anticipated expiration: 2030-10-21

Abstract

The utility model discloses a reverse circulation reaming core drill, it includes: the drilling machine comprises a central drill bit, a hole expanding sleeve and a pipe shoe, wherein a large-diameter section and a small-diameter section which are coaxial are arranged on the central drill bit, the hole expanding sleeve and the pipe shoe are coaxially arranged on the large-diameter section, drilling teeth are arranged at the head ends of the central drill bit and the hole expanding sleeve, a drilling circular table is coaxially arranged at the head end of the large-diameter section, and a positioning conical concave surface is coaxially arranged on the head end surface of the drilling circular table; a drill bit vent hole and a drill bit central hole are formed in the central drill bit through the head end and the tail end; and an open slot penetrating to the central hole of the drill bit is formed in the drilling circular table along the radial direction. The utility model discloses a drilling tool can satisfy again when reaming rock drilling and can satisfy the requirement of conveniently getting the core, and the integrated level is higher.

Description

Reverse circulation reaming core drill

Technical Field

The utility model relates to an impacter makes technical field, in particular to reverse circulation reaming core drill.

Background

The existing concentric reaming drilling tool generally comprises a central drill bit, a pipe shoe, a reaming sleeve and the like, and the specific structure of the concentric reaming drilling tool is that the pipe shoe is screwed at one end of a following pipe, the central drill bit is sleeved at the center of the pipe shoe, one end of the central drill bit is provided with a down-hole impactor connector, the other end of the central drill bit is clamped with the reaming sleeve, and a matched groove is formed in the reaming sleeve and outside the pipe shoe. As the collection of the rock center sample can be used for geological exploration, seismic research and the like in the rock drilling process, the requirement of people on the collection of the rock center sample is higher and higher along with the deep research on the rock. The existing reaming percussion drill tool in the market does not have a reaming drill tool with a coring function, and in order to fill the market vacancy, the coring function is necessary to be integrated into the reaming drill tool, and further optimized.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a reverse circulation reaming core drill, this drilling tool can satisfy the requirement that conveniently gets the core again when can satisfying reaming rock drilling, and the integrated level is higher.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a reverse circulation reaming core drill, include: the drilling machine comprises a central drill bit, a hole expanding sleeve and a pipe shoe, wherein a large-diameter section and a small-diameter section which are coaxial are arranged on the central drill bit, the hole expanding sleeve and the pipe shoe are coaxially arranged on the large-diameter section, drilling teeth are arranged at the head ends of the central drill bit and the hole expanding sleeve, a drilling circular table is coaxially arranged at the head end of the large-diameter section, and a positioning conical concave surface is coaxially arranged on the head end surface of the drilling circular table;

a drill bit vent hole and a drill bit central hole are formed in the central drill bit through the head end and the tail end; and an open slot penetrating to the central hole of the drill bit is formed in the drilling circular table along the radial direction.

Furthermore, the drill central hole is sequentially provided with a first cylindrical hole section, a conical hole section with gradually increased diameter and a second cylindrical hole section from the head end along the tail end direction.

Furthermore, an axial clamping groove is formed in the outer wall of the large-diameter section from the head end in the tail end direction, a circumferential clamping groove penetrating the axial clamping groove is further formed in the outer wall of the large-diameter section, and correspondingly, matched clamping teeth are arranged on the inner wall of the reaming sleeve.

Furthermore, a first radial hole for communicating the second cylindrical hole section with the axial clamping groove and a second radial hole for communicating the second cylindrical hole section with the circumferential clamping groove are formed in the large-diameter section along the radial direction.

Furthermore, a first groove which is radially inward and a second groove communicated with the axial clamping groove are formed in the drill bit vent hole close to the hole opening of the head end.

Compared with the prior art, the beneficial effects of the utility model are that: the drilling tool can meet the requirements of convenient coring while hole expansion and rock drilling, and the integration level is high. The utility model discloses during well reaming cover installation, the latch on it slips into along the axial draw-in groove from the head end earlier, rotatory certain angle again for block is tight after getting into the circumference draw-in groove, easy to assemble.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a front view schematic diagram of a center drill according to an embodiment of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1 according to the present invention;

FIG. 3 is a schematic cross-sectional view of the cross-sectional view B-B of FIG. 1 according to the present invention;

FIG. 4 is a schematic cross-sectional view of the present invention taken along line C-C of FIG. 2;

FIG. 5 is a schematic bottom view of the embodiment of FIG. 2;

fig. 6 is a schematic front view structure diagram of the reaming sleeve according to the embodiment of the present invention;

FIG. 7 is a schematic diagram of the right side view of FIG. 6 according to the present invention;

fig. 8 is a schematic view of a main section structure of the pipe boot of the embodiment of the present invention.

In the figure: 1. a center drill; 11. drilling a circular table; 12. positioning a conical concave surface; 13. a vent hole; 14. a drill bit central hole; 15. an open slot; 16. a first cylindrical bore section; 17. a conical bore section; 18. a second cylindrical bore section; 19. an axial clamping groove; 20. a circumferential clamping groove; 21. clamping teeth; 22. a first radial bore; 23. a second radial bore; 24. a first groove; 25. a second groove; 2. a hole expanding sleeve; 3. a pipe boot.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-8, in one embodiment, the present invention provides a reverse circulation reaming core drill, comprising: the center drill bit 1 is provided with a large-diameter section and a small-diameter section which are coaxial, the large-diameter section is coaxially provided with the reaming sleeve 2 and the pipe shoe 3, the head ends of the center drill bit 1 and the reaming sleeve 2 are provided with drilling teeth, and the head end of the large-diameter section is coaxially provided with a drilling circular table 11, wherein the drilling circular table 11 is convex outside the center and plays a role of guiding when drilling, and the head end surface of the drilling circular table 11 is coaxially provided with a positioning conical concave surface 12 which plays a role of positioning when drilling so as to reduce radial run-out; in addition, the large-diameter section is provided with a shaft shoulder, and the pipe boot 3 is tightly propped against the shaft shoulder;

a drill bit vent hole 13 and a drill bit central hole 14 are formed in the central drill bit 1 through the head end and the tail end; an opening groove 15 penetrating to a central hole 14 of the drill bit is formed in the drilling circular table 11 along the radial direction, and the opening groove 15 is beneficial to stripping rock stratum during drilling. After the drill bit vent hole 13 penetrates through the large-diameter section, the drill bit vent hole can be communicated with a spline tooth groove on the outer circle of the small-diameter section, and high-pressure air is introduced through gaps among the spline tooth grooves.

The specific working process is as follows: the small diameter section at the tail end of the central drill bit 1 is in sliding connection with an inner hole of the drill clamping sleeve, the tail end applies force by using an impact piston, high-pressure air is introduced into the drill bit vent hole 13 and blown out towards the head end, chips are removed, rock strata generated in the drilling process are reversely extruded from the drill bit central hole 14 to form a core, the core can enter a core taking pipe arranged in the drill bit central hole 14, subsequent taking out is facilitated, and the drill bit can meet the requirements of reaming and rock drilling and the requirement of facilitating core taking, and is high in integration level.

In this embodiment, the drill center hole 14 is optionally provided with a first cylindrical hole section 16, a conical hole section 17 with an increasing diameter, and a second cylindrical hole section 18 in sequence from the head end to the tail end. The inner diameter of the second cylindrical hole section 18 is larger than that of the first cylindrical hole section 16, so that the rock stratum is loosened after being transited from the small-diameter hole section to the large-diameter hole section, and is blown to the rear section under the action of air pressure.

In this embodiment, optionally, an axial clamping groove 19 is formed in the outer wall of the large-diameter section from the head end along the tail end direction, a circumferential clamping groove 20 penetrating the axial clamping groove 19 is further formed in the outer wall of the large-diameter section, and correspondingly, a matched clamping tooth 21 is arranged on the inner wall of the reaming sleeve 2. When the reaming sleeve 2 is installed, the latch 21 on the reaming sleeve firstly slides in from the head end along the axial clamping groove 19 and then rotates for a certain angle, so that the latch is tightly clamped after entering the circumferential clamping groove 20, and the installation is convenient.

In this embodiment, optionally, a first radial hole 22 communicating the second cylindrical hole section 18 and the axial clamping groove 19, and a second radial hole 23 communicating the second cylindrical hole section 18 and the circumferential clamping groove 20 are radially formed in the large-diameter section. High-pressure air blown out from the head end conveniently enters the central hole 14 of the drill bit through the first radial hole 22 and the second radial hole 23 respectively to blow the rock stratum to the rear section.

In this embodiment, the drill bit vent hole 13 is optionally opened with a first groove 24 facing radially inward and a second groove 25 communicating with the axial locking groove 19 at the opening near the head end. The first groove 24 is axially directed to facilitate entry into the head end of the central bore 14 of the drill bit, while the second groove 25 facilitates high pressure air flow into the axial locking groove 19.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to assist in understanding the methods and their core concepts. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the above technical features can be combined in a proper manner; the application of these modifications, variations or combinations, or the application of the concepts and solutions of the present invention in other contexts without modification, is not intended to be considered as a limitation of the present invention.

Claims

1. A reverse circulation reaming core drill bit, comprising: center drill bit (1), reaming cover (2) and pipe shoe (3), establish coaxial big footpath section and path section on center drill bit (1), big footpath section coaxial arrangement reaming cover (2), pipe shoe (3), the head end of center drill bit (1), reaming cover (2) all is equipped with bores tooth, its characterized in that: the head end of the large-diameter section is coaxially provided with a drilling circular table (11), and the head end surface of the drilling circular table (11) is coaxially provided with a positioning conical concave surface (12);

a drill bit vent hole (13) and a drill bit center hole (14) are formed in the central drill bit (1) in a penetrating mode, wherein the head end and the tail end of the central drill bit are provided with drill bit vent holes; an opening groove (15) penetrating to a drill bit center hole (14) is formed in the drilling circular table (11) along the radial direction.

2. A reverse circulation reaming core drilling tool according to claim 1, characterized in that said drill central bore (14) is provided with a first cylindrical bore section (16), a conical bore section (17) of increasing diameter and a second cylindrical bore section (18) in succession from the head end in the direction of the tip end.

3. The reverse circulation reaming core drilling tool according to claim 2, characterized in that the outer wall of the large diameter section is provided with an axial clamping groove (19) along the tail end direction from the head end, and is further provided with a circumferential clamping groove (20) which is communicated with the axial clamping groove (19), and correspondingly, the inner wall of the reaming sleeve (2) is provided with a matched clamping tooth (21).

4. A reverse circulation reaming core drill bit according to claim 3, characterized in that said large diameter section is provided with a first radial hole (22) radially communicating the second cylindrical hole section (18) with the axial clamping groove (19), and a second radial hole (23) radially communicating the second cylindrical hole section (18) with the circumferential clamping groove (20).

5. A reverse circulation reaming core drilling tool according to claim 3, characterized in that the drill bit ventilation holes (13) open at the hole opening near the head end with a first groove (24) radially inwards and a second groove (25) communicating with the axial clamping groove (19).