阅读说明：本技术 一种随钻定点密闭取心用钻头 (Drill bit for drilling fixed-point airtight coring ) 是由 张朋 王传留 田宏杰 龙威成 高晓亮 赵继展 居培 伍涛 于 2021-09-07 设计创作，主要内容包括：本发明公开的一种随钻定点密闭取心钻头,设置中空式钻头体,中空式钻头体端部径向间设多个切削翼；沿所述的切削翼间隙,在所述的中空式钻头体上径向挖设铰接通槽,所述的铰接通槽内铰接设置密闭式活动翼；由切削翼端贯穿,于所述的中空式钻头体轴心设置取芯孔。本发明提供的随钻密闭取心钻头,在正常钻进状态时,密闭式活动翼处于闭合状态,能够有效封堵钻头的取芯孔,避免煤渣进入密闭取心装置,待钻进到取心位置后,触动密闭取心装置推进机构,顶开密闭式活动翼,打开取芯孔,确保煤样顺利进入密闭取心装置内,完成随钻密闭取心工作。本发明解决了目前密闭取心装置取样时二次起下钻的问题,节省了工作时间,提高了取心效率。(The invention discloses a drill bit capable of performing fixed-point closed coring while drilling, which is provided with a hollow drill bit body, wherein a plurality of cutting wings are arranged at the end part of the hollow drill bit body in the radial direction; along the cutting wing gap, a hinged through groove is radially dug in the hollow drill body, and a closed movable wing is hinged in the hinged through groove; the cutting wing end penetrates through the hollow drill bit body, and a core taking hole is formed in the axis of the hollow drill bit body. According to the drill bit for closed coring while drilling, provided by the invention, when the drill bit is in a normal drilling state, the closed movable wings are in a closed state, so that the coring hole of the drill bit can be effectively blocked, coal slag is prevented from entering the closed coring device, after the drill bit is drilled to a coring position, the pushing mechanism of the closed coring device is triggered, the closed movable wings are pushed open, the coring hole is opened, a coal sample is ensured to smoothly enter the closed coring device, and the closed coring while drilling work is completed. The invention solves the problem of secondary tripping when the existing closed coring device samples, saves the working time and improves the coring efficiency.)

1. The drill bit for the fixed-point closed coring while drilling is characterized by being provided with a hollow drill bit body (1), wherein a plurality of cutting wings are arranged at the end part of the hollow drill bit body (1) in the radial direction;

along the cutting wing gap, a hinged through groove (11) is radially dug in the hollow drill body (1), and a closed movable wing (2) is hinged in the hinged through groove (11);

a core-taking hole (15) is arranged at the axis of the hollow drill body (1) and penetrates through the cutting wing end;

the closed movable wing (2) closes the coring hole (15).

2. The drill bit for while-drilling fixed-point closed coring as claimed in claim 1, wherein the closed movable wing (2) is provided with a movable wing body (21), a closing body (22) is arranged along the lateral extension of the movable wing body (21), and the closing body (22) is an annular arch-shaped component;

the closing body (22) closes the coring hole (15).

3. The drill bit for fixed-point closed-while-drilling coring as claimed in claim 2, wherein the movable wing body (21) is fixedly provided with a second cutting tooth (23).

4. The drill bit for point-while-drilling closed core coring as claimed in claim 1, 2 or 3, wherein the cutting wings comprise adjacent first cutting teeth (14) and gauge teeth (16).

5. The drill bit for point-while-drilling closed core coring as claimed in claim 1, 2 or 3, wherein a water channel (13) is further provided between adjacent cutting wings, and the water channel (13) extends along the axial direction of the hollow bit body (1).

6. The drill bit for point-while-drilling closed core drilling as claimed in claim 1, 2 or 3, wherein a positioning elastic clip (3) is further arranged in the hollow drill body (1);

the positioning elastic clamp (3) is arranged on the axial limiting closed movable wing (2).

7. The drill bit for point-while-drilling closed core drilling as claimed in claim 1, 2 or 3, wherein a plurality of drainage through grooves (12) are formed on the hollow drill bit body (1);

the drainage channel (12) is in-situ with the cutting wings.

8. The drill bit for point-while-drilling closed coring as claimed in claim 1, 2 or 3, wherein the hollow drill body (1) is provided with a coring hole (15) at the axial center, and the coring hole (15) extends from the cutting wing to the lower part of the closed movable wing (2);

the sealing area of the closed movable wing (2) is larger than or equal to the radial surface area of the coring hole (15).

9. The drill bit for point-while-drilling closed core drilling as claimed in claim 1, 2 or 3, wherein a core barrel (5) is arranged in the hollow drill bit (1), and the diameter of the core barrel (5) is equal to or smaller than the diameter of the core hole (15).

10. The drill bit for site-specific closed coring while drilling according to claim 9, wherein a closing valve (6) is further provided on the coring barrel (5).

Technical Field

The invention belongs to the technical field of safety of coal mine gas treatment, and mainly relates to a drill bit for drilling fixed-point closed coring, which is mainly used for extracting coal samples during coal seam gas extraction, gas outburst prevention and coal seam detection during gas treatment.

Background

The method for monitoring the gas content of the coal bed needs to perform coal bed sampling work in a specified area, and the conventional coal bed sampling method generally has two technical schemes, wherein one technical scheme is to collect returned coal cinder at an orifice during drilling; according to the other technical scheme, after the coal seam is drilled, the drill is lifted and the drilling tool is replaced, and then independent sampling is carried out. Patent CN201410739874.9 has introduced a surface drilling coal bed gas, airtight coring device of rock stratum gas content test, the airtight coring bit that supporting patent CN202010980185.2 disclosed, through having the airtight coring ware that can open, the original state nature of the sample coal body has been guaranteed to the at utmost, the measurement accuracy of coal seam gas content has been improved greatly, the device has solved the technical problem of coal sample authenticity, but the device must carry when using and bore behind the appointed coal seam of creeping into, the secondary is gone into the sampler and is sampled, lead to the construction process complicated, the auxiliary operation time is long, workman intensity of labour is big. In order to better realize the fixed-point rapid sampling of the coal bed, the invention provides a technical scheme of a fixed-point closed coring bit while drilling.

Disclosure of Invention

Aiming at the technical problems of the existing coal sampling technology, the invention provides a drill bit for fixed-point closed coring while drilling.

In order to achieve the purpose, the invention adopts the following technical scheme:

a drill bit for drilling fixed-point closed coring is provided with a hollow drill bit body, wherein a plurality of cutting wings are arranged at the end part of the hollow drill bit body in the radial direction; along the cutting wing gap, a hinged through groove is radially dug in the hollow drill body, and a closed movable wing is hinged in the hinged through groove; the cutting wing end penetrates through the hollow drill bit body, and a core taking hole is formed in the axis of the hollow drill bit body; the closed movable wing closes the coring hole.

Optionally, the closed movable wing is provided with a movable wing body, and an enclosing body is arranged along the side direction of the movable wing body in an extending manner, wherein the enclosing body is an annular arch-shaped component; the closing body closes the coring hole.

Optionally, a second cutting tooth is fixedly arranged on the movable wing body.

Optionally, the cutting wing includes a first cutting tooth and a gauge tooth which are adjacently arranged.

Optionally, a water channel is further disposed between adjacent cutting wings, and the water channel extends along the axial direction of the hollow bit body.

Optionally, a positioning elastic clip is further arranged in the hollow drill bit body; the positioning elastic clip is clamped on the axial limiting closed movable wing.

Optionally, a plurality of drainage through grooves are formed in the hollow drill bit body; the drainage groove is in the same position with the cutting wing.

Optionally, a coring hole is arranged at the axis of the hollow bit body, and the coring hole extends to the lower part of the closed movable wing from the cutting wing; the sealing area of the closed movable wing is larger than or equal to the radial surface area of the coring hole.

Optionally, a core barrel is arranged in the hollow drill bit body, and the barrel diameter of the core barrel is equal to or smaller than the bore diameter of the core hole.

Optionally, a sealing valve is further arranged on the coring barrel.

Through the content of the invention, the technical effects which can be realized by the invention are as follows:

the drill bit for closed coring while drilling provided by the invention can push the movable blades to open and close through the upper drilling tool to switch the drilling state and the coring state, so that one-trip drilling for drilling and coring is realized, and the problem that the existing closed coring construction is difficult to repeatedly trip and trip is solved. The invention has the technical characteristics of simple and convenient operation process and time and labor saving construction, has positive significance for ensuring the safe production of the coal mine, and has popularization value.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic structural view of a closed core bit while drilling according to the present invention;

FIG. 2 is a schematic view of a closed type movable wing structure according to the present invention;

FIG. 3 is a structural diagram of a longitudinal section of the drill bit for closed core drilling according to the present invention at a hinged through-slot (closed drilling state);

FIG. 4 is a longitudinal sectional structural view of the drill bit of the present invention at the hinged through-slot (core drilling state);

FIG. 5 is a longitudinal cross-sectional view of the closed-core while drilling drill bit of the present invention at a waterway;

the reference numerals in the figures denote:

1-a hollow bit body, 11-a hinged through groove, 12-a drainage through groove, 13-a water channel, 14-a first cutting tooth, 15-a core-taking hole, 16-a gauge-keeping tooth and 17-a circular channel; 2-closed movable wing, 21-movable wing body, 211-hinge hole, 22-closing body and 23-second cutting tooth; 3-positioning elastic clip, 4-articulated shaft, 5-core-taking barrel and 6-sealing valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With reference to fig. 1-5, the drill bit for fixed-point closed coring while drilling of the invention is provided with a hollow drill bit body 1, wherein a plurality of cutting wings are arranged at the end part of the hollow drill bit body 1 in the radial direction; along the gap of the cutting wings, a hinged through groove 11 is radially dug in the hollow drill body 1, and a closed movable wing 2 is hinged in the hinged through groove 11; a core taking hole 15 is arranged at the axis of the hollow drill body 1 and penetrates through the cutting wing end; the closed movable wing 2 closes the coring hole 15. Specifically, a hollow type bit body 1 is arranged, a plurality of cutting wings are designed at the top of the hollow type bit body 1 and are arranged at intervals along the radial direction of the top, and first cutting teeth 14 and gauge protection teeth 16 are embedded and welded on the cutting wings; the center of the hollow bit body 1 is provided with a coring hole 15 for coring, which is coplanar with the cutting wings; be equipped with water course 13 between the adjacent cutting wing, in the lower part of cutting wing place face, be provided with a plurality of articulated logical groove 11 on the cavity formula drill bit body 1 and excrete logical groove 12, articulated logical groove 11 and excrete the crisscross alternate distribution of logical groove 12, articulated logical groove 11 design has hinge mechanism and positioning mechanism, closed activity wing 2 passes through hinge mechanism to be fixed in articulated logical groove 11 to can rotate around hinge mechanism, articulated one end top design has location bullet card 3, avoid closed activity wing 2 mistake under the free state to open. The coring hole 15 is internally provided with a ring 17 for placing the closed movable wing 2 to retract, the top of the closed movable wing 2 is provided with a second cutting tooth 23, two side surfaces of the closed movable wing 2 are provided with closing bodies 22, and the closing bodies 22 are mainly used for closing the coring hole 15 in the hollow bit body 1 below the closed movable wing 2 so as to ensure that the coring hole 15 in the drilling process is in a closed state.

In the embodiment of the present disclosure, the closed movable wing 2 is provided with a movable wing body 21, and an enclosure 22 is provided extending laterally along the movable wing body 21, where the enclosure 22 is a ring-arch member; the closing body 22 closes the coring hole 15. The top end of the closed movable wing 2 is provided with a second cutting tooth 23, the second cutting tooth 23 is fixed on the cutting wing in a welding mode, one end of the closed movable wing 2 is provided with a hinge hole 211, two sides of the closed body 22 are provided with closing bodies 22, the closing bodies 22 are of arch structures, the maximum diameter of each arch structure is larger than the aperture of the corresponding core taking hole 15, and when the closed movable wing 2 is closed, the closing bodies 22 can completely block the core taking holes 15. When the sealed movable vane 2 is machined, the second cutting teeth 23 are provided at the tip end of the sealed movable vane 2, the second cutting teeth 23 are fixed to the cutting-vane pockets by welding, the welding may be brazing or another welding method, and the closing body 22 and the movable vane body 21 may be an integral structure or a separate structure.

In the embodiment of the disclosure, the cutting wings are distributed at the top of the drill bit, the number of the cutting wings is 4, the first cutting teeth 14 are fixed on the cutting wings in a welding mode, the first cutting teeth 14 are arranged to ensure that the inside and the outside of the drill bit are exposed, and the exposure of the first cutting teeth 14 is 0.5-1 mm; the first cutting tooth 14 is preferably a diamond compact, and may also be made of cemented carbide or other superhard materials, the cutting tooth may be circular, arc, polygonal, etc., and the gauge protection tooth 16 may be made of cemented carbide or polycrystalline materials, and may be circular, long strip, etc. The first cutting teeth 14 are designed to have a certain exposure, so that high-efficiency drilling speed can be ensured during normal drilling, the diameter-protecting cutting teeth 16 are designed to ensure that the drill bit does not reduce diameter during drilling, the service life of the drill bit is prolonged, and the drilling quality is ensured.

In the embodiment of the disclosure, a positioning elastic card 3 is also arranged in the hollow drill bit body 1; the positioning elastic clamp 3 is arranged on the axial limiting closed movable wing 2. Specifically, the hinged through groove 11 is arranged between the two groups of cutting wings and located at a position below the cutting wings, the hinged through groove 11 is a non-through type through groove, a hinged positioning hole and a positioning limiting hole are machined in the side wall of the hinged through groove 11, the positioning limiting hole is located above the hinged positioning hole, the hinged positioning hole is used for installing a positioning pin shaft, the fixed closed type movable wings 2 are fixed, the positioning limiting hole is used for installing a positioning elastic clip 3, and the fixed closed type movable wings 2 are prevented from being mistakenly opened in a free state.

In the embodiment of the present disclosure, the drainage through grooves 12 are 2 groups, and are located right below the cutting blade, and the drainage through grooves 12 are flush with and run through the lower edge of the ring channel 17 to assist in draining the coal slag.

In the embodiment of the present disclosure, the ring 17 is located in the middle of the hollow drill bit body 1, and the diameter of the ring 17 is larger than the maximum diameter required for retracting the sealed movable wing 2.

In the embodiment of the disclosure, a water channel 13 is further provided between adjacent cutting wings, and the water channel 13 extends along the axial direction of the hollow bit body 1. The water channels 13 and the hinged through grooves 11 are distributed in a staggered mode, the water channels 13 are of a waist hole structure, and after the water channels 13 are connected with the coring barrel 5, the water channels 13 are not communicated with the coring holes 15.

In the embodiment of the disclosure, the axis of the hollow bit body 1 is provided with a coring hole 15, and the coring hole 15 extends from the cutting wing to the lower part of the closed movable wing 2; the sealing area of the closed movable wing 2 is larger than or equal to the radial surface area of the coring hole 15. The coring hole 15 is matched with the coring barrel 5, the aperture of the coring hole 15 is slightly smaller than the diameter of the sampling end of the coring barrel 5, and the diameter size difference is 1-2 mm; the cutting tooth material in the invention can be cutting materials such as PDC, hard alloy and the like.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.