CN210067979U

CN210067979U - Drill bit for coal mine

Info

Publication number: CN210067979U
Application number: CN201920890112.7U
Authority: CN
Inventors: 练炳方
Original assignee: Ningbo Shendian Tools Co Ltd
Current assignee: Ningbo Shendian Tools Co Ltd
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2020-02-14
Anticipated expiration: 2029-06-13

Abstract

The utility model discloses a drill bit for coal mine, including the drill bit body, the upper end integrated into one piece of drill bit body has two knife rests that are centrosymmetric and set up, all be formed with the step on the inside wall of each knife rest, all be fixed with a blade on each step, each blade is welded fastening with the knife rest that corresponds, all be provided with location structure between each blade and the knife rest that corresponds, location structure includes at least one locating pin of integrated into one piece on the up end of step, be provided with the locating hole that can supply one of them locating pin to insert respectively on the lower terminal surface of blade; the utility model discloses a set up location structure between blade and knife rest, so, can realize the location to the blade before blade and knife rest welding to when welding blade and knife rest, can avoid the phenomenon that blade off normal or aversion appear, and then can improve the precision after blade and the knife rest welding, can improve the quality of drill bit promptly.

Description

Drill bit for coal mine

Technical Field

The utility model relates to a drill bit technical field, concretely relates to drill bit for coal mine.

Background

In the coal mine drilling process, need use the drill bit, present drill bit generally includes the drill bit body, and the upper end welded fastening of drill bit body has the blade, but does not possess location structure between present blade and the drill bit body, so, before blade and drill bit body weld, hardly realize the location to blade and drill bit body to can make the phenomenon of blade appearance off normal, and then can influence the quality of drill bit.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a drill bit for coal mine, it is through setting up location structure between blade and knife rest, so, can realize the location to the blade before blade and knife rest welding to when welding blade and knife rest, can avoid the blade to appear the phenomenon of off normal or aversion, and then can improve the precision after blade and the knife rest welding, can improve the quality of drill bit promptly.

The utility model discloses a drill bit for coal mine, including the drill bit body, the upper end integrated into one piece of drill bit body has two knife rests that are central symmetry and set up, all is formed with the step on the inside wall of every knife rest, all is fixed with a blade on every step, every blade and the knife rest welded fastening who corresponds, all be provided with location structure between every blade and the knife rest that corresponds, location structure includes at least one locating pin of integrated into one piece on the up end of step, is provided with on the lower terminal surface of blade and supplies one of them locating pin male locating hole respectively.

The utility model discloses a drill bit for coal mine, wherein, homogeneous shaping has two locating pins on every step, is provided with on the lower terminal surface of blade and supplies one of them locating pin male locating hole respectively.

The utility model discloses a drill bit for coal mine, wherein, the upper end of locating pin is provided with by the lower supreme annular conical surface of inside contraction gradually.

The utility model discloses a drill bit for coal mine, wherein, the both ends of blade and all are provided with the recess towards one side of knife rest, and it has the solder to fill between recess and the knife rest, and the blade passes through solder welded fastening with the knife rest.

The utility model discloses a drill bit for coal mine, wherein, the side of step is an inclined plane, forms contained angle a between the side of step and the vertical face, and the number of degrees of contained angle a is 4-8 degrees.

The utility model discloses a drill bit for coal mine, wherein, the number of degrees of contained angle a is 6 degrees.

The utility model discloses a set up location structure between blade and knife rest, so, can realize the location to the blade before blade and knife rest welding to when welding blade and knife rest, can avoid the phenomenon that blade off normal or aversion appear, and then can improve the precision after blade and the knife rest welding, can improve the quality of drill bit promptly.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of the three-dimensional structure of the present invention with the blade removed;

FIG. 3 is a schematic cross-sectional view of the utility model with the blade removed;

fig. 4 is a cross-sectional structural view of the blade.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, details of these implementations are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for description purposes, not specifically referring to the order or sequence, and are not intended to limit the present invention, but only to distinguish the components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model discloses a drill bit for coal mine, including drill bit body 1, the upper end integrated into one piece of drill bit body 1 has two knife rests 11 that are central symmetry and set up, all be formed with step 12 on the inside wall of each knife rest 11, all be fixed with a blade 2 on each step 12, each blade 2 and the knife rest 11 welded fastening that corresponds, be provided with location structure between each blade 2 and the knife rest 11 that corresponds, location structure includes at least one locating pin 13 of integrated into one piece on the up end of step 12, be provided with the locating hole 21 that can supply one of them locating pin 13 to insert respectively on the lower terminal surface of blade 2; the utility model discloses a set up location structure between blade and knife rest, insert the locating hole back promptly at the locating pin, can realize the location to blade and knife rest, so, when welding blade and knife rest, can avoid the blade phenomenon of off normal or aversion to appear, and then can improve the precision after blade and the knife rest welding, can improve the quality of drill bit promptly.

Two positioning pins 13 are integrally formed on each step 12, and positioning holes 21 into which one positioning pin 13 can be inserted are formed in the lower end face of the blade 2; after adopting this kind of structure, after the locating pin inserts the locating hole, can realize the reliable location to the blade, so, when later stage with blade and knife rest welding, can bring the convenience for the welding of blade and knife rest, and through set up two locating pins on every step after, can realize fixing a position the blade better.

The upper end of the positioning pin 13 is provided with an annular conical surface 14 which gradually shrinks inwards from bottom to top; through the arrangement of the annular conical surface, the annular conical surface can be matched with the inner wall of the positioning hole for guiding so as to facilitate the insertion of the positioning pin into the positioning hole.

Grooves 22 are formed in two ends of the blade 2 and one side, facing the tool rest 11, of the blade 2, welding materials 3 are filled between the grooves 22 and the tool rest 11, and the blade 2 and the tool rest 11 are fixed through welding materials 3 in a welding mode; by adopting the structure, the welding flux can be filled in the groove, so that the welding flux can better realize the welding of the blade and the tool rest, and the strength of the blade and the tool rest after welding can be improved.

The side surface of the step 12 is an inclined surface, an included angle a is formed between the side surface of the step 12 and a vertical surface, and the degree of the included angle a is 4-8 degrees; the degree of the included angle a is 6 degrees; after the side of the step is set to be the inclined plane, the blade abuts against the side of the step, and when the blade drills a coal mine, the blade can be buffered.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a drill bit for coal mine, includes drill bit body (1), the upper end integrated into one piece of drill bit body (1) has two knife rest (11) that are central symmetry and set up, all is formed with step (12) on the inside wall of every knife rest (11), all is fixed with one blade (2) on every step (12), every blade (2) and knife rest (11) welded fastening that corresponds, its characterized in that: all be provided with location structure between every blade (2) and the knife rest (11) that corresponds, location structure includes at least one locating pin (13) of integrated into one piece on the up end of step (12), be provided with respectively on the lower terminal surface of blade (2) and supply locating hole (21) that one of them locating pin (13) inserted.

2. The coal mine drill bit as claimed in claim 1, characterized in that two positioning pins (13) are integrally formed on each step (12), and the lower end face of the blade (2) is provided with positioning holes (21) into which one of the positioning pins (13) can be inserted.

3. The coal mine drill bit according to claim 1 or 2, characterized in that the upper end of the positioning pin (13) is provided with an annular conical surface (14) which gradually shrinks inwards from bottom to top.

4. The coal mine drill bit as claimed in claim 1, characterized in that a groove (22) is arranged at each end of the blade (2) and at one side facing the tool rest (11), solder (3) is filled between the groove (22) and the tool rest (11), and the blade (2) and the tool rest (11) are fixed by welding through the solder (3).

5. The coal mine drill bit as claimed in claim 1, characterized in that the side surface of the step (12) is an inclined surface, an included angle a is formed between the side surface of the step (12) and a vertical surface, and the degree of the included angle a is 4-8 degrees.

6. The coal mine drill bit as recited in claim 5, wherein the included angle a is 6 degrees.