CN217400823U

CN217400823U - Wedge type diamond coring bit

Info

Publication number: CN217400823U
Application number: CN202221086938.6U
Authority: CN
Inventors: 简旺; 张钧祥; 朱道贺; 王博; 何奕铮
Original assignee: Henan University of Technology
Current assignee: Henan University of Technology
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2022-09-09
Anticipated expiration: 2032-05-07

Abstract

The utility model relates to a wedge type diamond coring bit, including cutter arbor and blade, wherein the cutter arbor is hollow cylinder cavity structures, and the blade is a plurality of, encircles the cutter arbor axis and is connected with the preceding terminal surface of cutter arbor, and the blade includes preceding peak and back of the body peak, and wherein the preceding peak is wedge type body structure, including sword blade I, sword blade II, cutting edge I, cutting edge II, cutting edge III, cutting edge IV. This novel resistance and impact between blade cutting edge face and the rock can effectively be reduced, the cutting force of blade to the rock is improved to greatly improve diamond coring blade and to the cutting force, the fracture effect of rock when the rotatory coring that bores, increased the decurrent component effect of blade simultaneously, increased the stability between blade and the cutter arbor.

Description

Wedge type diamond coring bit

Technical Field

The utility model relates to a wedge type diamond coring bit, which belongs to the technical field of medical and geological exploration equipment and drill bits.

Background

When geological rock formations need to be analyzed in mining and building, a coring bit with a diamond blade is mounted at the front end of a drill pipe sleeve to drill. What mainly plays a role in the integrity and high drilling efficiency of core drilling is the core bit, and the blade structure that the core bit set up is the key place that improves core drilling integrity and high drilling efficiency. The rotary power of the drill bit is large, a reasonable mechanical structure design of the drill bit blade is not provided, the effect is not provided, and only a large amount of energy is wasted. The existing coring diamond drill bit mainly has a straight line shape, a triangular shape, a cross shape or an X shape and the like, the structures have the common characteristic that the left and right cutting edges of a blade are thin and thick, the cutting force and the cracking to rocks are small, the resistance is large, when the drill bit rotates, the rock is split by the strong impact force of the cutting edges of the blade to the rocks, so that the core drilling is completed, the strong impact splitting force is easy to cause the core to be broken, most of the drilled cores are broken blocks, the rock composition analysis and the mechanical property test are not facilitated, in addition, the cutting edges are vertical, no good mechanical sharing effect exists when the drill bit contacts with the rocks, the force is completely born by the bottom position of the blade, the blade and the drill bit are easy to fall off, and the working efficiency, the quality and the use stability of the coring drill bit are seriously influenced.

Therefore, in order to solve the problem, the development of a brand-new diamond core bit structure is urgently needed to meet the requirement of practical use.

SUMMERY OF THE UTILITY MODEL

In order to solve the not enough in the prior art, this novel wedge type diamond coring bit that provides, this is novel through the integrative structural design who divide into the front peak and the back peak to the drill bit blade, the front peak is unanimous with drill bit direction of rotation, design into 45 to thick structure by thin the front peak blade in the horizontal direction upper shed, design 65 in vertical direction, 45 gradient structure, greatly improve the diamond coring blade and to the incision force of rock when rotatory brill coring, the fracture effect, compare a line shape blade simultaneously, the decurrent component effect of blade has been increased, stability between blade and the drill bit has been increased, thereby guarantee the integrality and the drilling efficiency that the rock core bored more easily, and blade stability.

In order to achieve the above purpose, the present invention is realized by the following technical solution:

a wedge-shaped diamond core bit comprises a cutter bar and a plurality of blades, wherein the cutter bar is of a hollow cylindrical cavity structure, the blades are connected with the front end face of the cutter bar around the axis of the cutter bar, each blade comprises a front peak and a back peak, the back peak is positioned on the rear side of the front peak and connected with the rear side face of the front peak, the cutting direction of the front peak is consistent with the rotating direction of the cutter bar, the cutting direction of the back peak is opposite to the rotating direction of the cutter bar, the back peak is of a frustum structure, the upper end face of the back peak is lower than the upper end face of the front peak by at least 0.5 mm, the front peak is of a wedge-shaped body structure and comprises a cutter edge I, a cutter edge II, a cutter edge face I, a cutter edge face II, a cutter edge face III and a cutter edge face IV, the cutter edge II and the cutter edge I are of an integral structure, the cutter edge I is positioned below the cutter edge II, an included angle of 50-70 degrees is formed between the cutter edge I and the horizontal plane, an included angle of 30-50 degrees is formed between the cutter edge I and the horizontal plane, and the front peak corresponding to the cutter edge I is provided with the inner side face, the outer side surface is provided with a cutting edge surface II, the inner side surface of the front peak corresponding to the cutting edge II is provided with a cutting edge surface III, the outer side surface is provided with a cutting edge surface IV, the cutting edge surface I and the cutting edge surface II are intersected and form an included angle of 30-50 degrees, the cutting edge surface III and the cutting edge surface IV are intersected and form an included angle of 30-50 degrees, and the cutting edge surface I, the cutting edge surface II, the cutting edge surface III and the cutting edge surface IV are all in an arc surface structure.

Furthermore, the front peak and the back peak of each blade are of an integrated structure, each blade is connected with the front end face of the cutter bar through at least one of a sliding groove, a pin and a bolt structure, and meanwhile, the blades can be connected with the front end face of the cutter bar through welding.

Furthermore, the distance between the blades connected with the front end surface of the cutter bar is 0-10 mm, and the total length of the blades is not less than 80% of the perimeter of the front end surface of the cutter bar.

Furthermore, the outer side surface of the connection surface of the front peak and the back peak of the blade is parallel and level to the outer side surface of the cutter bar, the radian of the cutting edge surface II and the radian of the cutting edge surface IV are consistent with that of the drill rod, and the rotation directions of the cutting edge I, the cutting edge II and the cutter bar are kept on the same arc line.

Furthermore, the back peak is a quadrangular frustum structure with an axial interface in any one of an isosceles problem type and a right trapezoid, and the inner side surface and the outer side surface of the back peak are curved surface structures coaxially distributed with the cutting edge surface III and the cutting edge surface IV.

Furthermore, the upper end surfaces of the front peak and the back peak are distributed in parallel with the front end surface of the cutter bar, and the height of the front peak is not less than 2 times of the maximum width of the blade.

This is novel through being divided into the integrative structural design of front peak and back peak to the drill bit blade, the front peak is unanimous with drill bit direction of rotation, the front peak blade is 45 in the open design of horizontal direction go up the structure by thin to thick, design 65 in vertical direction, 45 gradient structure, the realization is made the blade of coring bit into thin thick nonconformity structure, the non-vertical structure of blade edge, can effectively reduce resistance and the impact between blade cutting edge and the rock, improve the incision force of blade to the rock, thereby greatly improve the incision force of diamond coring blade to the rock when rotary drilling coring, the effect of splitting, the decurrent component effect of blade has been increased simultaneously, the stability between blade and the cutter arbor has been increased, guarantee the integrality and the drilling efficiency that the core drilled more easily, and blade stability.

Drawings

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments;

FIG. 1 is a schematic diagram of the novel structure;

FIG. 2 is a front view of the blade;

FIG. 3 is a side view schematic of a blade;

FIG. 4 is a schematic view of a structure of the force applied between the cutting edge face and the rock formation during sampling;

FIG. 5 is a schematic diagram of the stress structure between the cutting edge I and the cutting edge II and the rock stratum during sampling.

Detailed Description

In order to make the technical means, creation features, achievement purposes and effects of the novel implementation easy to construct, the novel implementation is further explained below by combining with specific embodiments.

As shown in fig. 1-4, a wedge-type diamond core drill bit comprises a cutter bar 1 and a plurality of blades 2, wherein the cutter bar 1 is a hollow cylindrical cavity structure, the plurality of blades 2 are connected with the front end surface of the cutter bar 1 around the axis of the cutter bar 1, the blade 2 comprises a front peak 21 and a back peak 22, the back peak 22 is positioned at the rear side of the front peak 21 and is connected with the rear side surface of the front peak 21, the cutting direction of the front peak 21 is consistent with the rotating direction of the cutter bar 1, the cutting direction of the back peak 22 is opposite to the rotating direction of the cutter bar 1, the back peak 22 is of a frustum structure, the upper end surface of the back peak is at least 0.5 mm lower than the upper end surface of the front peak 21, the front peak 21 is of a wedge-type structure and comprises a cutting edge i 211, a cutting edge ii 212, a cutting edge i 213, a cutting edge ii 214, a cutting edge iii 215 and a cutting edge iv 216, the cutting edge ii cutting edge 212 and the cutting edge i cutting edge 211 are positioned below the cutting edge ii 212, and form an included angle of 50-70 degrees with the horizontal plane, the included angle of the knife edge II 212 and the horizontal plane is 30-50 degrees, the inner side face of the front peak 21 corresponding to the knife edge I211 is provided with a knife edge face I213, the outer side face is provided with a knife edge face II 214, the inner side face of the front peak 21 corresponding to the knife edge II 212 is provided with a knife edge face III 215, the outer side face is provided with a knife edge face IV 216, the knife edge face I213 and the knife edge face II 214 are intersected, the knife edge face III 215 and the knife edge face IV 216 are intersected and form the included angle of 30-50 degrees, and the knife edge face I213, the knife edge face II 214, the knife edge face III 215 and the knife edge face IV 216 are all arc surface structures.

Preferably, the knife edge II 212 and the knife edge I211 are of an integrated structure, the knife edge I211 is located below the knife edge II 212, the knife edge I211 forms a 65-degree included angle with the horizontal plane, and the knife edge II 212 forms a 45-degree included angle with the horizontal plane; cutting edge surface I213 and cutting edge surface II 214 intersect, cutting edge surface III 215 and cutting edge surface IV 216 intersect, and all form an included angle of 45 degrees.

In this embodiment, the front peak 21 and the back peak 22 of the blade 2 are of an integral structure, and each blade 2 is connected with the front end surface of the cutter bar 1 through at least one of a sliding groove, a pin and a bolt structure, and meanwhile, the blade 2 is connected with the front end surface of the cutter bar 1 through welding.

Through adopting split type structure between blade and cutter arbor, can realize according to getting the core operation needs, nimble adjustment blade distribution position realizes simultaneously getting when core operation in the damage of local blade, can realize changing in a flexible way and maintain the operation.

Preferably, the distance between the blades 2 connected with the front end face of the cutter bar 1 is 0-10 mm, and the total length of the blades 2 is not less than 80% of the circumference of the front end face of the cutter bar 1.

Meanwhile, the outer side surface of the connecting surface of the front peak 21 and the back peak 22 of the blade 2 is parallel and level to the outer side surface of the cutter bar 1, the curved surfaces of the cutting edge surface II 214 and the cutting edge surface IV 216 adopt radians consistent with those of a drill rod, and the rotating directions of the cutting edge I211, the cutting edge II 212 and the cutter bar 1 are kept on the same circular arc line.

Through the design of the circular arc structure, the contact area between each blade face of the front edge and the rock can be effectively increased, the maximum cutting force of the blade face is exerted, and the coring operation efficiency is improved.

In this embodiment, the back peak 22 is a quadrangular frustum structure having an isosceles trapezoid or a right trapezoid at its axial interface, and both the inner side surface and the outer side surface of the back peak are curved surfaces coaxially distributed with the cutting edge surface iii 215 and the cutting edge surface iv 216.

The contact area of the back peak and the front peak is increased, the reaction force to the front peak is increased, and the stability of the blade is improved; the back peak is slightly lower than the front peak in height, so that the back peak is prevented from being in direct contact with the rock, and the drilling efficiency of the front peak and the rock is ensured.

Preferably, the upper end faces of the front peak 21 and the back peak 22 are both distributed in parallel with the front end face of the cutter bar 1, and the height of the front peak 21 is not less than 2 times of the maximum width of the blade 2.

As shown in fig. 4 and 5, in the actual coring operation:

by arranging the intersecting knife edge I and the knife edge II, the intersecting knife edge surface III and the intersecting knife edge surface IV and forming a structure from thin to thick with an included angle of 45 degrees, because the two knife edge surfaces of the knife edge form an angle of 45 degrees, component forces F1 and F2 vertical to the two knife edge surfaces can be generated, and the two component forces can simultaneously act on rocks, the aim is to increase the cracking effect on the rocks, and simultaneously, because the knife edge is of a structure from thin to thick, the resistance F between the knife edge and the rocks can be reduced, and the cutting force on the rocks is increased;

through setting up knife edge II and knife edge I formula structure as an organic whole, and knife edge I is located knife edge II below, 65 contained angles are personally submitted with the horizontal plane to knife edge I, 45 contained angle structures are personally submitted with the horizontal plane to knife edge II, the drill bit is when boring the coring, because the most for the power F4 of horizontal direction of the power that the rock gave the knife edge, F6 etc. and some non-horizontal power F3, F5 etc. design into 65, 45 gradient structures to knife edge on vertical direction, the blade produces a decurrent component Fa for blade bottom position on vertical face coring, increase blade stability, the prevention and cure blade breaks away from the cutter arbor, improve the stability and the reliability of drill bit equipment operation.

The foregoing shows and describes the basic principles and principal features of the present novel form, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments illustrated above, which are intended to be illustrative only of the principles of the invention, and that various changes and modifications may be made to the invention without departing from the spirit and scope of the invention, which is to be construed as falling within the scope of the invention as claimed. The scope of the present novel claims is defined by the appended claims and equivalents thereof.

Claims

1. A wedge type diamond core bit which is characterized in that: the wedge-shaped diamond coring bit comprises a cutter bar and a cutter blade, wherein the cutter bar is of a hollow cylinder cavity structure, the cutter blade is a plurality of and is connected with the front end face of the cutter bar around the axis of the cutter bar, the cutter blade comprises a front peak and a back peak, the back peak is positioned on the rear side of the front peak and is connected with the rear side face of the front peak, the cutting direction of the front peak is consistent with the rotating direction of the cutter bar, the cutting direction of the back peak is opposite to the rotating direction of the cutter bar, the back peak is of a frustum structure, the upper end face of the back peak is lower than the upper end face of the front peak by at least 0.5 mm, the front peak is of a wedge-shaped body structure and comprises a cutter edge I, a cutter edge II, a cutter edge I, a cutter edge II, a cutter edge III and a cutter edge IV, the cutter edge II and the horizontal plane form an included angle of 50-50 degrees, the inner side face of the front peak corresponding to the knife edge I is provided with a knife edge face I, the outer side face of the front peak corresponding to the knife edge II is provided with a knife edge face II, the outer side face of the front peak corresponding to the knife edge II is provided with a knife edge face III, the knife edge face I and the knife edge face II are intersected and form an included angle of 30-50 degrees, the knife edge face III and the knife edge face IV are intersected and form an included angle of 30-50 degrees, and the knife edge face I, the knife edge face II, the knife edge face III and the knife edge face IV are of circular arc surface structures.

2. A wedge diamond core bit according to claim 1, wherein: the front peak and the back peak of the blade are of an integrated structure, the blades are connected with the front end face of the cutter bar through at least one of a sliding groove, a pin and a bolt structure, and meanwhile the blades can be connected with the front end face of the cutter bar through welding.

3. A wedge diamond core bit according to claim 1, wherein: the distance between the blades connected with the front end face of the cutter bar is 0-10 mm, and the total length of the blades is not less than 80% of the perimeter of the front end face of the cutter bar.

4. A wedge-type diamond core bit according to claim 1, wherein: the outer side surface of the blade front peak and back peak connecting surface is parallel and level to the outer side surface of the cutter bar, the cutting edge surface II and the cutting edge surface IV curve surface adopt radians consistent with the drill rod, and the cutting edge I, the cutting edge II and the cutter bar rotating direction are kept on the same arc line.

5. A wedge-type diamond core bit according to claim 1, wherein: the back peak is a quadrangular frustum structure with an axial interface in any one of an isosceles problem type and a right trapezoid, and the inner side surface and the outer side surface of the back peak are curved surface structures coaxially distributed with the cutting edge surface III and the cutting edge surface IV.

6. A wedge-type diamond core bit according to claim 1, wherein: the upper end surfaces of the front peak and the back peak are both distributed in parallel with the front end surface of the cutter bar, and the height of the front peak is not less than 2 times of the maximum width of the blade.