A drill bit and drill bit and drill rod connection assembly

Abstract

The application provides a drill bit and a drill bit and drill rod connecting assembly, and belongs to the technical field of mine drilling tools, and comprises a drill bit, a drill rod and a connecting piece; the drill bit comprises a drill bit body, one end of the drill bit body is a drilling part, and the other end is a connecting part; a first positioning protrusion is arranged at the connecting position of the drilling part and the connecting part, and a first positioning groove is arranged between the first positioning protrusion and the drilling part; the drill rod has a plug hole matched with the connecting part; the plug end of the drill rod has a second positioning protrusion in contact with the first positioning protrusion, and a second positioning groove is formed between the second positioning protrusion and the drill rod; the connecting piece is detachably sleeved on the first positioning groove and the second positioning groove; the connecting piece also has a plug slot for axially limiting the drill bit and the drill rod; the connecting part and the drill rod are connected through a spline; when the drill bit needs to be disassembled, the connecting piece is disassembled, the axial limitation between the drill bit and the drill rod is released, and then the drill bit can be conveniently disassembled from the drill rod by an operator.

Description

Technical Field

[0001] This application belongs to the field of mining drilling tools technology, specifically relating to a drill bit and a drill bit and drill rod connection assembly. Background Technology

[0002] Top hammer drills are used in mining, tunneling, and geotechnical drilling. A top hammer drill consists of a drill bit, drill rod, and shank. The drill bit and drill rod are connected by threads, and the shank is connected to the drill rod by a connecting sleeve. High-pressure water flows into the shank through a hole, then into the drill bit through the central control drill rod. Finally, the high-pressure water exits from the drill bit's drain hole, flushing away rock cuttings at the bottom of the hole.

[0003] During rock drilling, the piston in the hydraulic rock drill reciprocates to impact the drill bit, and the impact energy is transmitted to the drill bit through the drill rod, breaking the rock; in addition, the drill bit is rotating, which can break the rock.

[0004] Because the drill bit and drill rod are connected by threads, under the combined effects of high impact loads, vibration, and wear, the threads may deform, causing the drill bit to get stuck inside the drill rod and making it difficult to remove the drill bit. Utility Model Content

[0005] This application provides a drill bit and a drill bit and drill rod connection assembly, which aims to solve the problem in the prior art that the drill bit is easily stuck in the drill rod, making it difficult to disassemble the drill bit.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] A drill bit is provided, comprising:

[0008] The drill bit body has a drilling section at one end and a connecting section at the other end; the connecting section is used to connect with a splined connection to one end of the drill rod.

[0009] The drilling part and the connecting part are provided with a first positioning protrusion, and a first positioning groove is formed between the first positioning protrusion and the drilling part; the first positioning groove can be detachably connected to the drill rod through a connector to axially limit the drill bit body and the drill rod.

[0010] The drill bit provided in this application, compared with the prior art, has a spline connection between the drill bit body and the drill rod, which can transmit torque. The spline has better load-bearing capacity, impact resistance and wear resistance than the threaded form, thus reducing the occurrence of the drill bit getting stuck in the drill rod. The drill bit body is detachably connected to the drill rod through a connector, and the drill bit can be removed from the drill rod after the connector is separated from the drill bit body.

[0011] To achieve the above objectives, another technical solution adopted in this application is:

[0012] A drill bit and drill pipe connection assembly is provided, comprising:

[0013] drill;

[0014] The drill rod has a second positioning protrusion at one end that contacts the first positioning protrusion, and a second positioning groove is formed between the second positioning protrusion and the drill rod; the connection between the drill rod and the drill bit is splined.

[0015] The connector is detachably fitted onto the first positioning groove and the second positioning groove; the connector also has a slot that engages with the first positioning protrusion and the second positioning protrusion to axially limit the drill bit and drill rod.

[0016] In one possible implementation, the drilling portion has a connecting section near the connecting portion, and a first positioning protrusion and a first positioning groove are located on the connecting section; the diameter of the connecting section is the same as the diameter of the drill rod, and the diameter of the connector is less than or equal to the diameter of the connecting section.

[0017] In one possible implementation, both the first positioning protrusion and the second positioning protrusion are annular structures, and the diameters of both the first positioning protrusion and the second positioning protrusion are smaller than the diameter of the connector.

[0018] In one possible implementation, the first positioning protrusion is a plurality of protrusions spaced apart circumferentially along the connecting segment, and the second positioning protrusion is a plurality of protrusions spaced apart circumferentially along the drill pipe.

[0019] The diameters of the first positioning protrusion and the second positioning protrusion are both smaller than the diameter of the connector.

[0020] In one possible implementation, the spline connection between the connecting portion and the drill pipe is an equal-diameter spline connection or a tapered spline connection.

[0021] In one possible implementation, the spline connection between the connecting portion and the drill pipe is an interference fit.

[0022] In one possible implementation, the connector includes two arc-shaped structures that are detachably connected.

[0023] Wherein, after the drill bit and the drill rod are inserted into place, the two arc-shaped structures are engaged on the first positioning groove and the second positioning groove.

[0024] In one possible implementation, the two arcuate structures have countersunk holes aligned with each other at their connection points, and the two arcuate structures are fixed together by bolts and nuts.

[0025] In one possible implementation, both the first positioning groove and the second positioning groove are annular structures, and both the first positioning protrusion and the second positioning protrusion are annular structures.

[0026] In one possible implementation, the ends of the two arc-shaped structures are in contact with each other, and the two ends of the arc-shaped structures are in contact with the sidewalls of the first positioning groove and the second positioning groove, respectively.

[0027] This application provides a drill bit and drill rod connection assembly. Compared with the prior art, by fitting a connector onto the first positioning groove and the second positioning groove, and by engaging with the first positioning protrusion and the second positioning protrusion, the assembly can axially limit the drill bit and drill rod, ensuring the connection between the drill rod and the drill bit during drill bit operation; reducing the possibility of the drill bit and drill rod separating when the drill is lifted upwards; and releasing the axial limit between the drill bit and drill rod when the drill bit needs to be disassembled, thus facilitating the operator to remove the drill bit from the drill rod. Attached Figure Description

[0028] Figure 1 A schematic diagram of a drill bit and drill pipe connection assembly provided for an embodiment of this application;

[0029] Figure 2 A cross-sectional schematic diagram of a drill bit and drill pipe connection assembly provided for an embodiment of this application;

[0030] Figure 3 for Figure 2 Enlarged diagram of section A in the middle;

[0031] Figure 4 A schematic diagram of the drill bit portion of a drill bit and drill rod connection assembly provided in an embodiment of this application;

[0032] Figure 5 A cross-sectional schematic diagram of the drill rod portion of a drill bit and drill rod connection assembly provided in an embodiment of this application;

[0033] Figure 6 This is a schematic diagram of a connecting part of a drill bit and drill rod connection assembly provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Drill bit; 11. Drilling part; 12. Connecting part; 13. First positioning protrusion; 14. First positioning groove; 2. Drill rod; 21. Insertion hole; 22. Second positioning protrusion; 23. Second positioning groove; 3. Connector; 31. Slot; 32. Arc-shaped structure; 33. Countersunk hole. Detailed Implementation

[0035] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0036] Please refer to the following: Figures 1 to 6 The present application provides a drill bit, which includes a drill bit body, one end of which is a drilling part 11 and the other end is a connecting part 12. The connecting part 12 is used to spline connect with one end of a drill rod 2. A first positioning protrusion 13 is provided at the connection between the drilling part 11 and the connecting part 12, and a first positioning groove 14 is formed between the first positioning protrusion 13 and the drilling part 11. The first positioning groove 14 can be detachably connected to the drill rod 2 through a connector 3 to axially limit the drill bit body and the drill rod 2.

[0037] Based on the same design concept, this application also provides a drill bit and drill rod connection assembly. The drill bit and drill rod connection assembly includes a drill bit 1, a drill rod 2, and a connector 3; the drill rod 2 has an insertion hole 21 that engages with the connecting portion 12, and the drill rod 2 is splinedly connected to the connecting portion 12 of the drill bit 1; the insertion end of the drill rod 2 has a second positioning protrusion 22 that contacts a first positioning protrusion 13, and a second positioning groove 23 is formed between the second positioning protrusion 22 and the drill rod 2; the connector 3 is detachably sleeved on the first positioning groove 14 and the second positioning groove 23; the connector 3 also has a slot 31 that engages with the first positioning protrusion 13 and the second positioning protrusion 22 to axially limit the drill bit 1 and the drill rod 2.

[0038] This application provides a connection assembly for a drill bit 1 and a drill rod 2. Compared with the prior art, the drill bit 1 and the drill rod 2 are connected by a spline, which can transmit torque. Moreover, the spline has better load-bearing capacity, impact resistance, and wear resistance than the threaded type, thus reducing the possibility of the drill bit 1 getting stuck in the drill rod 2. The connector 3 is sleeved on the first positioning groove 14 and the second positioning groove 23, and the connector 3 is inserted and engaged with the first positioning protrusion 13 and the second positioning protrusion 22, which can axially limit the drill bit 1 and the drill rod 2, ensuring the connection between the drill rod 2 and the drill bit 1 during the operation of the drill bit 1. When the drill is lifted upward, the possibility of the drill bit 1 separating from the drill rod 2 is reduced. When it is necessary to disassemble the drill bit 1, the connector 3 can be removed to release the axial limitation between the drill bit 1 and the drill rod 2, thereby facilitating the operator to remove the drill bit 1 from the drill rod 2.

[0039] It should be noted that other structures on drill bit 1 and drill rod 2 not mentioned in this application are all prior art and will not be described in detail here.

[0040] In some embodiments, such as Figures 1 to 6As shown, the drilling part 11 has a connecting section near the connecting part 12, and the first positioning protrusion 13 and the first positioning groove 14 are located on the connecting section; the diameter of the connecting section is the same as the diameter of the drill rod 2, and the diameter of the connector 3 is less than or equal to the diameter of the connecting section.

[0041] The diameter of the connecting section is the same as the diameter of the drill rod 2, and the diameter of the connecting piece 3 is not greater than the diameter of the connecting section. This ensures that the outer peripheral wall of the connecting piece 3 does not exceed the outer peripheral wall of the connecting section. Therefore, during the drilling process, the axial drilling resistance generated by the connecting piece 3 can be reduced, ensuring the stability during the drilling process.

[0042] The first positioning protrusion 13 and the second positioning protrusion 22 can be annular or a plurality of them arranged circumferentially. When the first positioning protrusion 13 and the second positioning protrusion 22 are annular, the slot 31 on the connector 3 is an annular groove, and the two ends of the annular groove contact the ends of the first positioning protrusion 13 and the second positioning protrusion 22 respectively, so as to axially limit the first positioning protrusion 13 and the second positioning protrusion 22.

[0043] When the first positioning protrusion 13 and the second positioning protrusion 22 are a plurality of ones spaced apart along the circumferential direction, the first positioning protrusion 13 and the second positioning protrusion 22 correspond one-to-one; the slot 31 on the connector 3 is an annular groove, and the two ends of the slot 31 contact the ends of the first positioning protrusion 13 and the second positioning protrusion 22 respectively, so as to axially limit the first positioning protrusion 13 and the second positioning protrusion 22.

[0044] Specifically, in some embodiments, such as Figures 1 to 6 As shown, both the first positioning protrusion 13 and the second positioning protrusion 22 are annular structures. The diameters of the first positioning protrusion 13 and the second positioning protrusion 22 are smaller than the diameter of the connector 3. This arrangement avoids the slot 31 on the connector 3 from being a through slot, thus preventing the connector 3 from being divided into two parts from the slot 31. By setting the diameters of the first positioning protrusion 13 and the second positioning protrusion 22 to be smaller than the diameter of the connector 3, both the first positioning protrusion 13 and the second positioning protrusion 22 are located within the slot 31. Through the cooperation between the slot 31 and the first positioning protrusion 13 and the second positioning protrusion 22, the first positioning protrusion 13 and the second positioning protrusion 22 can be axially limited.

[0045] Specifically, in some embodiments, such as Figures 1 to 6 As shown, the first positioning protrusion 13 is a plurality of protrusions spaced apart along the circumference of the connecting section, and the second positioning protrusion 22 is a plurality of protrusions spaced apart along the circumference of the drill rod 2; wherein, the diameter of the first positioning protrusion 13 and the diameter of the second positioning protrusion 22 are both smaller than the diameter of the connecting piece 3.

[0046] With the above settings, even if the first positioning protrusion 13 is a number of circumferentially spaced protrusions and the second positioning protrusion 22 is a number of circumferentially spaced protrusions, it will not affect the axial positioning of the annular groove on the first positioning protrusion 13 and the second positioning protrusion 22. Therefore, the drill bit 1 and the drill rod 2 can also be axially positioned.

[0047] In some embodiments, such as Figures 1 to 6 As shown, the spline connection between the connecting part 12 and the drill rod 2 is either an equal diameter spline connection or a tapered spline connection.

[0048] Equal diameter splines refer to splines and spline grooves located on a cylindrical surface; tapered splines refer to splines and spline grooves located on a tapered surface.

[0049] The connection between the connecting part 12 and the drill rod 2 via a tapered spline improves the alignment during the connection process between the drill bit 1 and the drill rod 2. The spline connection between the connecting part 12 and the drill rod 2 is an interference fit, which improves the tightness of the drill bit 1 and the drill rod 2 during operation and reduces the relative rotation between the drill bit 1 and the drill rod 2 during rotation, thereby reducing the impact between the drill bit 1 and the drill rod 2.

[0050] In some embodiments, such as Figures 1 to 6 As shown, the connector 3 includes two arc-shaped structures 32, which are detachably connected; wherein, after the drill bit 1 and the drill rod 2 are inserted into place, the two arc-shaped structures 32 are fastened to the first positioning groove 14 and the second positioning groove 23.

[0051] The first positioning groove 14 and the second positioning groove 23 are both annular structures, and the first positioning protrusion 13 and the second positioning protrusion 22 are both annular structures; the inner peripheral wall of the arc-shaped structure 32 can contact the bottom wall of the first positioning groove 14 and the bottom wall of the second positioning groove 23, and the slot 31 on the arc-shaped structure 32 is inserted and engaged with the first positioning protrusion 13 and the second positioning protrusion 22.

[0052] After the two arc-shaped structures 32 are engaged with the first positioning groove 14 and the second positioning groove 23, the ends of the two arc-shaped structures 32 come into contact with each other, and the two ends of the arc-shaped structures 32 respectively come into contact with the side wall of the first positioning groove 14 and the side wall of the second positioning groove 23. Through the above arrangement, the first positioning protrusion 13 and the second positioning protrusion 22 can play an axial limiting role, thereby axially limiting the drill bit 1 and the drill rod 2.

[0053] The two arc-shaped structures 32 are fixed together by bolts and nuts. Specifically, in some embodiments, such as... Figure 1As shown, the two arc-shaped structures 32 have countersunk holes 33 that are aligned with each other at the connection position. After the two arc-shaped structures 32 are fitted onto the first positioning groove 14 and the second positioning groove 23, the countersunk holes 33 on the two arc-shaped structures 32 are aligned with each other. At this time, the threaded end of the bolt is passed through the threaded hole on the two arc-shaped structures 32, and the other end is fixed together by the nut threadedly engaging with the bolt.

[0054] With the above configuration, the two arc-shaped structures 32 only serve to limit the axial movement of the first positioning protrusion 13 and the second positioning protrusion 22. The arc-shaped structures 32 do not restrict the circumferential rotation of the first positioning protrusion 13 and the second positioning protrusion 22. The circumferential rotation restriction of the first positioning protrusion 13 and the second positioning protrusion 22 is achieved through the spline. That is, after the drill bit 1 and the drill rod 2 are connected by the spline, the rotation of the drill bit 1 and the drill rod 2 can be restricted circumferentially, and the spline can transmit circumferential torque.

[0055] For example, one of the arc-shaped structures 32 may also be provided with a threaded hole. After the threaded end of the bolt passes through the countersunk hole of the other arc-shaped structure 32, the threaded end of the bolt can be threadedly engaged with the threaded hole on the adjacent arc-shaped structure 32, thereby fixing the two arc-shaped structures 32.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A drill bit, characterized in that, include: The drill bit body has a drilling section at one end and a connecting section at the other end; the connecting section is used to connect with a splined connection to one end of the drill rod. The drilling part and the connecting part are provided with a first positioning protrusion, and a first positioning groove is formed between the first positioning protrusion and the drilling part; the first positioning groove can be detachably connected to the drill rod through a connector to axially limit the drill bit body and the drill rod.

2. A drill bit and drill pipe connection assembly, characterized in that, include: The drill bit as described in claim 1; The drill rod has a second positioning protrusion at one end that contacts the first positioning protrusion, and a second positioning groove is formed between the second positioning protrusion and the drill rod; the connection between the drill rod and the drill bit is splined. The connector is detachably fitted onto the first positioning groove and the second positioning groove; the connector also has a slot that engages with the first positioning protrusion and the second positioning protrusion to axially limit the drill bit and drill rod.

3. The drill bit and drill pipe connection assembly as described in claim 2, characterized in that, The drilling section has a connecting segment near the connecting section, and a first positioning protrusion and a first positioning groove are located on the connecting segment; the diameter of the connecting segment is the same as the diameter of the drill rod, and the diameter of the connector is less than or equal to the diameter of the connecting segment.

4. The drill bit and drill pipe connection assembly as described in claim 3, characterized in that, Both the first positioning protrusion and the second positioning protrusion are annular structures, and the diameters of the first positioning protrusion and the second positioning protrusion are smaller than the diameter of the connector.

5. The drill bit and drill pipe connection assembly as described in claim 3, characterized in that, The first positioning protrusion is a plurality of protrusions spaced apart circumferentially along the connecting section, and the second positioning protrusion is a plurality of protrusions spaced apart circumferentially along the drill pipe; The diameters of the first positioning protrusion and the second positioning protrusion are both smaller than the diameter of the connector.

6. The drill bit and drill pipe connection assembly as described in claim 2, characterized in that, The spline connection between the connecting part and the drill rod is either an equal-diameter spline connection or a tapered spline connection.

7. The drill bit and drill pipe connection assembly as described in claim 6, characterized in that, The spline connection between the connecting part and the drill pipe has an interference fit.

8. The drill bit and drill pipe connection assembly as described in claim 2, characterized in that, The connector includes two arc-shaped structures, which are detachably connected. Wherein, after the drill bit and the drill rod are inserted into place, the two arc-shaped structures are engaged on the first positioning groove and the second positioning groove.

9. The drill bit and drill pipe connection assembly as described in claim 8, characterized in that, The two arc-shaped structures have countersunk holes aligned with each other at their connection points, and the two arc-shaped structures are fixed together by bolts and nuts.

10. The drill bit and drill pipe connection assembly as described in claim 8, characterized in that, Both the first positioning groove and the second positioning groove are annular structures, and both the first positioning protrusion and the second positioning protrusion are annular structures. The ends of the two arc-shaped structures are in contact with each other, and the two ends of the arc-shaped structures are in contact with the sidewalls of the first positioning groove and the second positioning groove, respectively.

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