Tunneling drill bit for coal mine

Abstract

The utility model relates to the technical field of coal mine excavating tools, and particularly discloses a tunneling drill bit for coal mine, which comprises a mounting rod, a plurality of drilling tools and a spiral drill bushing, a plurality of accommodating grooves are uniformly and annularly formed in the end part of the mounting rod, and a plurality of first threaded through holes are uniformly formed in one end, far away from a vertical shaft, of the side part of the mounting rod; second threaded through holes are formed in the ends of tool handles of the drilling tools, locking threaded holes are further formed in the sides, away from the first threaded through holes, of the containing grooves, locking bolts are detachably connected between the tool handles of the drilling tools and the mounting rod, and the locking bolts are in threaded connection with the first threaded through holes, the second threaded through holes and the locking threaded holes. The end, away from the drilling tool, of the spiral drilling sleeve is further provided with a connecting structure used for being fixedly connected with the side end of the mounting rod, and the problems that a traditional drill bit used for mine tunneling is connected with a drill rod through bolts, so that soil and gravel easily enter a groove in the connecting position of the drill bit and the drill rod, the bolts and the drill bit are inconvenient to disassemble, and use is affected are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of coal mining tools, and particularly discloses a coal mine tunneling drill bit. BACKGROUND

[0002] The drill bit is a cutter used for drilling a through hole or a blind hole on a solid material and can be used for reaming an existing hole. During coal mine tunneling operation, the drill bit rotates with the vertical shaft and simultaneously moves axially. Ore is cut under the action of the torque and axial force of the drill bit and is loosened under the action of the extrusion of the working blade and the centrifugal force, so that the soil flow is pressed against the pit wall and is transported to the ground along the page. When the soil flow moves to a position without pit wall obstruction, the loosened soil is thrown to the surroundings of the pit due to the centrifugal force, and the digging process is completed.

[0003] Since the metal material used for manufacturing the drill bit is relatively high in cost, the volume of the drill bit is relatively small. The drill bit needs to be installed in cooperation with a drill rod and can be used in drilling work. The drill bit and the drill rod are usually connected through bolts. In order to prevent the bolts from affecting the drilling process, a groove is usually formed in the outer end of the drill rod, and the bolt is installed into the groove. However, during the tunneling process, mud and sandstone and the like can enter the connection position between the drill bit and the drill rod, that is, the groove formed in the drill rod. The mud and sandstone and the like are easily filled in the groove and are not convenient for the dismounting of the bolt, thereby affecting the replacement and use of the drill bit. Therefore, the inventor provides the coal mine tunneling drill bit in order to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the problems that the traditional drill bit and drill rod used in mine tunneling are connected through bolts, the mud and sandstone are easily filled in the groove of the connection position, the bolts and the drill bit are inconvenient to dismount, and the use is affected.

[0005] In order to achieve the above purpose, the basic scheme of the utility model provides a coal mine tunneling drill bit, which comprises an installation rod coaxially and detachably connected with a vertical shaft, a plurality of drill bits uniformly and detachably connected with the end of the installation rod away from the vertical shaft, and a spiral drill sleeve used for reaming and screw-connected with the outer side of the installation rod, the end of the installation rod is uniformly provided with a plurality of accommodating grooves used for accommodating the handle end of the drill bit, the side of the installation rod away from the vertical shaft is uniformly provided with a plurality of first threaded through holes communicated with one side of the accommodating groove, the handle end of the drill bit is provided with a second threaded through hole with the same diameter as the first threaded through hole, the side of the accommodating groove away from the first threaded through hole is further provided with a locking threaded hole with the same diameter as the first threaded through hole, the handle of the drill bit is detachably connected with the installation rod through a locking bolt, the locking bolt is screw-connected with the first threaded through hole, the second threaded through hole and the locking threaded hole, and the end of the spiral drill sleeve away from the drill bit is further provided with a connecting structure used for connecting and fixing with the side end of the installation rod.

[0006] The principle and effect of the basic scheme are that:

[0007] 1. Compared with the prior art, the utility model discloses a containing groove, first threaded through -hole, second threaded through -hole, locking threaded hole and locking bolt are set up, and the connection of drill bit and mounting rod is installed conveniently, the outer side of the mounting rod is detachably connected through the thread with the spiral drill sleeve, and then the side of the mounting rod is completely wrapped in, the mounting mode of drill bit hiding is adopted, the drill bit is connected in the containing groove with the mounting rod, thereby the purpose that the mounting part of drill bit is completely hidden is achieved, the containing groove, first threaded through -hole, second threaded through -hole, locking threaded hole and locking bolt for connecting drill bit and mounting rod are exposed and introduce dirt and gravel and other sundries, avoid affecting the normal disassembly operation of drill bit, simultaneously, through setting up the connecting structure, the connection and fixed of spiral drill sleeve and mounting rod are convenient, the bolt and drill bit are inconvenient to disassemble, and the problem of affecting use is solved, which makes the dirt and gravel easily enter the recess inside the connecting part.

[0008] Further, the connecting structure includes a connecting arc plate symmetrically arranged on the end face of the spiral drill sleeve away from the drill bit, a positioning limiting plate symmetrically arranged between the ends of the connecting arc plate away from the drill bit, a mounting hole arranged in the middle of the positioning limiting plate, and a connecting bolt mounted between the mounting hole and the end of the mounting rod away from the drill bit, the end of the mounting rod away from the drill bit is provided with a connecting threaded hole, the connecting bolt and the connecting threaded hole are detachably connected through threads, and the inner diameter of the connecting arc plate is equal to the outer diameter of the mounting rod. By arranging the connecting arc plate, the positioning limiting plate and the connecting bolt, the threaded connection and fixation of the spiral drill sleeve and the mounting rod are facilitated, and by arranging the inner diameter of the connecting arc plate equal to the outer diameter of the mounting rod, the connection of the connecting arc plate and the mounting rod is more compact, facilitating disassembly, and the positioning limiting plate and the connecting bolt also facilitate the installation of the mounting rod and the vertical shaft.

[0009] Further, the inner wall of the spiral drill sleeve is provided with a connecting internal thread groove, and the side surface of the mounting rod is provided with a connecting external thread structure detachably connected with the connecting internal thread groove through threads. The connecting external thread structure and the connecting internal thread groove are arranged to connect the spiral drill sleeve and the mounting rod, and the connection is firm and convenient for disassembly and assembly.

[0010] Further, the end opening area of the containing groove is smaller than the bottom area of the drill bit. By limiting the area relationship between the drill bit and the containing groove, the end opening of the containing groove is completely covered by the drill bit, and the connection part of the drill bit and the mounting rod is completely hidden.

[0011] Further, the mounting hole is a T-shaped hole, and the head end face of the connecting bolt can be flush mounted with the end port of the mounting hole. By arranging the flush mounting of the mounting hole and the connecting bolt, the mounting of the mounting rod and the vertical shaft is affected by the protrusion of the connecting bolt from the mounting hole or the recess of the connecting bolt in the mounting hole. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0013] Figure 1 The overall structure assembly perspective view of the tunneling drill bit for coal mine is shown;

[0014] Figure 2 The assembly perspective view of the structure of the tunneling drill bit for coal mine in the disassembled state is shown;

[0015] Figure 3 The assembly front view of the structure of the tunneling drill bit for coal mine in the disassembled state is shown;

[0016] Figure 4 The structure assembly perspective view of the mounting rod and the drill bit of the tunneling drill bit for coal mine is shown. DETAILED DESCRIPTION

[0017] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined technical purposes, the specific embodiments, structures, features and effects according to the present application will be described in detail below in combination with the drawings and preferred embodiments.

[0018] The reference signs in the drawings of the specification include: mounting rod 1, drill bit 2, spiral drill sleeve 3, accommodating groove 4, first threaded through hole 5, second threaded through hole 6, locking threaded hole 7, locking bolt 8, connecting arc plate 9, alignment limiting plate 10, mounting hole 11, connecting bolt 12, connecting threaded hole 13, connecting internal threaded groove 14, connecting external threaded structure 15.

[0019] A tunneling drill bit for coal mine, the embodiment is Figure 1 As shown, it comprises a mounting rod 1 which is coaxially and detachably connected with a vertical shaft, three drill bits 2 which are uniformly and detachably connected at the end of the mounting rod 1 away from the vertical shaft, and a spiral drill sleeve 3 which is threadedly connected with the outer side of the mounting rod 1 and used for reaming. Figure 4 As shown, the end of the mounting rod 1 is uniformly provided with three accommodating grooves 4 for accommodating the handle end of the drill bit 2, and the side of the mounting rod 1 away from the vertical shaft is uniformly provided with three first threaded through holes 5 which are in communication with one side of the accommodating groove 4, and the handle end of the drill bit 2 is uniformly provided with a second threaded through hole 6 which is equal in diameter to the first threaded through hole 5. Figure 3As shown in the drawings, the accommodating groove 4 is further provided with a locking threaded hole 7 with the same diameter as the first threaded hole 5 on the side away from the first threaded hole 5, and the shank of the drill bit 2 is detachably connected with the mounting rod 1 through a locking bolt 8, which is threadedly connected with the first threaded hole 5, the second threaded hole 6 and the locking threaded hole 7, and the spiral drill sleeve 3 is further provided with a connecting structure at the end away from the drill bit 2 for connecting and fixing with the side end of the mounting rod 1.

[0020] As shown in the drawings, Figure 2 The connecting structure comprises symmetrical connecting arc plates 9 provided on the end face of the spiral drill sleeve 3 away from the drill bit 2, symmetrical alignment limiting plates 10 provided between the ends of the connecting arc plates 9 away from the drill bit 2, mounting holes 11 provided in the middle of the alignment limiting plates 10, and connecting bolts 12 mounted between the mounting holes 11 and the end of the mounting rod 1 away from the drill bit 2, wherein the end of the mounting rod 1 away from the drill bit 2 is provided with a connecting threaded hole 13, the connecting bolt 12 is threadedly detachably connected with the connecting threaded hole 13, and the inner diameter of the connecting arc plate 9 is equal to the outer diameter of the mounting rod 1.

[0021] As shown in the drawings, Figure 3 The inner wall of the spiral drill sleeve 3 is provided with a connecting inner threaded groove 14, and the side surface of the mounting rod 1 is provided with a connecting outer threaded structure 15 threadedly detachably connected with the connecting threaded groove. The end opening area of the accommodating groove 4 is smaller than the bottom area of the drill bit 2. The mounting hole 11 is a T-shaped hole, and the head end face of the connecting bolt 12 is flush with the end port of the mounting hole 11.

[0022] In the specific implementation process of the utility model, first, three drill bits 2 need to be connected and installed with the three accommodating grooves 4 at the end of the mounting rod 1. During installation, the shank part of the drill bit 2 is inserted and installed in the accommodating groove 4, and the first threaded hole 5, the second threaded hole 6 and the locking threaded hole 7 are concentrically placed, then the locking bolt 8 is screwed along the first threaded hole 5, and then the second threaded hole 6 and the locking threaded hole 7 are screwed in turn, thus completing the installation of one drill bit 2 and one accommodating groove 4 of the mounting rod 1, and then the connection and installation operation of the remaining two drill bits 2 and the accommodating grooves 4 is completed in the same way. Secondly, the spiral drill sleeve 3 needs to be connected and installed with the mounting rod 1. During installation, only the open end of the spiral drill sleeve 3 needs to be sleeved along the end of the mounting rod 1 away from the drill bit 2 until it is stopped at the connecting outer threaded structure 15, then the connecting inner threaded groove 14 is threadedly matched with the connecting outer threaded structure 15 by rotating the spiral drill sleeve 3, until the spiral drill sleeve 3 completely wraps the side surface of the mounting rod 1 near the drill bit 2, and the three locking bolts 8 are wrapped inside, at this time, the alignment limiting plate 10 and the end face of the end of the mounting rod 1 away from the drill bit 2 are in a close connection state, and finally the connecting bolt 12 is threadedly matched and installed with the connecting threaded hole 13, so that the connecting bolt 12 passes through the mounting hole 11 and is screwed into the connecting threaded hole 13, thus completing the assembly of the overall drill bit structure.

[0023] Compared with the prior art, the utility model discloses the installation of the first threaded hole 5, the second threaded hole 6, the locking threaded hole 7 and the locking bolt 8 in the containing groove 4, and the connection and installation of the drill bit 2 and the mounting rod 1 are facilitated, the outer side of the mounting rod 1 is detachably connected with the spiral drill sleeve 3 through the thread, and then the side of the mounting rod 1 is completely wrapped in, the drill bit 2 is connected in the containing groove 4 through the hidden installation mode of the drill bit 2, and the installation part of the drill bit 2 is completely hidden, so that the containing groove 4, the first threaded hole 5, the second threaded hole 6, the locking threaded hole 7 and the locking bolt 8 for connecting the drill bit 2 and the mounting rod 1 are prevented from being exposed and introducing the sundries such as soil and gravel, and the normal dismounting operation of the drill bit 2 is prevented from being affected, simultaneously, the connection and the fixed of the spiral drill sleeve 3 and the mounting rod 1 are facilitated through the setting connection structure, the drill bit and the drill rod used in the traditional mine tunneling are connected through the bolt, the soil and the gravel are prevented from entering the recess inside the connecting part, the bolt and the drill bit are prevented from being inconvenient to dismount, and the use problem is affected.

[0024] The above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, although the utility model has disclosed the above through the preferred embodiment, however, is not used to limit the utility model, any person skilled in the art, when not departing from the technical scheme range of the utility model, can make a little change or modification for the equivalent embodiment of equivalent change through the disclosed technical content, but as long as not departing from the technical scheme content of the utility model, according to the technical essence of the utility model, any brief introduction modification, equivalent change and modification of the above embodiment, still belongs to the range of the technical scheme of the utility model.

Claims

1. A heading bit for use in coal mining, characterised in that: The installation rod is detachably connected with the vertical shaft, a plurality of drill bits are uniformly detachably connected with the end of the installation rod far from the vertical shaft, and a spiral drill sleeve for reaming is threadedly connected with the outer side of the installation rod.

2. A drilling head for use in coal mining according to claim 1 wherein, The connecting structure comprises connecting arc plates symmetrically arranged on the end face of the spiral drill sleeve far from the drill bit, alignment limiting plates symmetrically arranged between the end of the connecting arc plate far from the drill bit, mounting holes arranged in the middle of the alignment limiting plate, and connecting bolts mounted between the mounting hole and the end of the installation rod far from the drill bit.

3. A drilling head for use in coal mining according to claim 2, characterised in that, The inner wall of the spiral drill sleeve is provided with a connecting internal thread groove, and the side surface of the installation rod is provided with a connecting external thread structure threadedly detachably connected with the connecting internal thread groove.

4. The heading bit of claim 3, wherein, The end opening area of the accommodating groove is smaller than the bottom area of the drill bit.

5. A heading bit for use in coal mining according to claim 4 wherein, The head end face of the connecting bolt is flush with the end port of the mounting hole.

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