A down-the-hole drill bit that is easy to assemble

Abstract

The utility model provides a down -the -hole drill convenient to assemble, including drill handle and drill head, the disc seat of coaxiality of drill head bottom is equipped with and is arranged with the disc seat of drill head ladder, the disc seat bottom is equipped with a plurality of first drill tooth, the side surface of drill head is equipped with a plurality of limiting key, the utility model still includes the expansion disc of the sleeve hole of the middle part of being equipped with of diameter greater than disc seat diameter, be equipped with a plurality of keyway with limiting key corresponding on the inner wall of sleeve hole, when the sleeve hole is covered in drill head, limiting key is placed in keyway, expansion disc bottom is placed on disc seat at this time, expansion disc bottom is equipped with a plurality of second drill tooth, the top of drill head is detachably connected with connecting seat, and connecting seat carries out the location to expansion disc. The utility model uses when, when drill needs to expand the hole operation, only needs to cover expansion disc in drill head, then can fix expansion disc with connecting seat installation in the top of drill head, and the convenient disassembly and assembly, and when expansion disc is disassembled, drill head can continue using.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, specifically to a down-the-hole drill bit that is easy to assemble. Background Technology

[0002] Down-the-hole (DH) drill bits are widely used in earthwork engineering, mining, well drilling, construction engineering, well drilling, and side column support. A DH drill bit is used in conjunction with a DH impactor, and the two work together via splines to perform drilling operations. The combination of a DH drill bit and a DH impactor results in straight, fast, and deep hole drilling.

[0003] Current down-the-hole (DH) drill bits are designed for individual use; that is, a single DH drill bit can only drill the hole it is designed for. To drill a larger hole, a larger drill bit is required. Therefore, we propose a DH drill bit that is easier to assemble. Utility Model Content

[0004] This invention provides a down-the-hole drill bit that is easy to assemble, and has the advantages of convenient assembly and disassembly, thus solving the problems mentioned in the background art.

[0005] The technical solution of this utility model is implemented as follows: A down-the-hole drill bit that is easy to assemble is designed, including a drill shank and a drill head. The bottom of the drill shank is coaxially connected to a connecting seat. A disc-shaped seat is coaxially provided at the bottom of the drill head and is stepped with the drill head. The bottom of the disc-shaped seat is provided with several first drill teeth. Multiple limiting keys are provided on the side of the drill head. This utility model also includes an expansion disc with a diameter larger than the diameter of the disc-shaped seat and a central hole. The inner wall of the hole is provided with multiple keyways corresponding to the limiting keys. When the hole is fitted onto the drill head, the limiting keys are placed in the keyways. At this time, the bottom of the expansion disc is placed on the disc-shaped seat. The bottom of the expansion disc is provided with several second drill teeth. The top of the drill head is detachably connected to the connecting seat, and the connecting seat limits the expansion disc.

[0006] Preferably, the limiting key is spaced a certain distance from the top of the drill bit, the side of the drill bit above the limiting key is provided with an external thread, and the connecting seat is provided with an internal thread that matches the external thread. The connecting seat is threadedly installed on the top of the drill bit.

[0007] Preferably, the side of the disc-shaped seat is provided with multiple outwardly extending protrusions, which are located below the limiting key and connected to each other, wherein the first drill teeth are distributed at the bottom of the protrusions.

[0008] Preferably, the edge of the disc-shaped seat is provided with a first flow groove.

[0009] Preferably, the protrusion is flush with the top of the disc-shaped base, and the bottom of the extension disc is also placed on the protrusion.

[0010] Preferably, the bottom of the expansion disk has a conical surface, and the first drill teeth are distributed on the conical surface.

[0011] Preferably, the edge of the conical surface is provided with multiple second flow grooves.

[0012] Compared with the prior art, when the drill bit needs to enlarge the hole, this utility model can be used by simply putting the expansion plate on the drill bit and then installing the connecting seat on the top of the drill bit to fix the expansion plate, which is convenient for disassembly and assembly. Moreover, the drill bit can continue to be used after the expansion plate is removed. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model after the expansion disk is installed.

[0015] Figure 2 This is a schematic diagram of the bottom of the present invention after the expansion disk is installed.

[0016] Figure 3 This is a schematic diagram of the structure of the drill bit, expansion disc, and drill shank of this utility model. Figure 1 .

[0017] Figure 4 This is a schematic diagram of the structure of the drill bit, expansion disc, and drill shank of this utility model. Figure 2 .

[0018] Figure 5 This is a schematic diagram of the structure of the drill bit, expansion disc, and drill shank of this utility model. Figure 3 .

[0019] Figure 6 This is a schematic diagram of the structure of this utility model without the expansion disk.

[0020] In the figure: 1. Drill shank; 2. Connecting seat; 3. Protrusion; 4. Expansion disc; 5. Second flow groove; 6. Conical surface; 7. Second drill tooth; 8. First drill tooth; 9. Disc seat; 10. First flow groove; 11. Sleeve hole; 12. Keyway; 13. Limit key; 14. Drill head; 15. External thread. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] Reference Figures 1 to 6 This utility model provides a technical solution: a down-the-hole drill bit that is easy to assemble, including a drill shank 1 and a drill head 14. The bottom of the drill shank 1 is coaxially connected to the connecting seat 2. It should be noted that the improvement of this application is in the drill bit position, while the drill shank 1 is the prior art and no improvement has been made to it. During installation, a tube shoe is put on the drill shank 1 and the drill shank 1 is installed under the drill rod.

[0023] The bottom of the drill bit 14 is coaxially provided with a disc-shaped seat 9, such as Figure 4 As shown, the disc-shaped seat 9 and the drill head 14 are stepped, so that the edge of the disc-shaped seat 9 extends beyond the side of the drill head 14, and the bottom of the disc-shaped seat 9 is provided with several first drill teeth 8. To increase the drilling area of ​​the drill bit, such as... Figure 3 and Figure 4 As shown, the side of the disc-shaped seat 9 is provided with multiple outwardly protruding parts 3, and the first drill tooth 8 located below the disc-shaped seat 9 is also distributed at the bottom of the protruding parts 3. Multiple limit keys 13 are provided on the side of the drill bit 14. The limit keys 13 are parallel to the axis of the drill bit 14, such as... Figure 4 As shown, the protrusions 3 are located below the limit keys 13 and are connected to each other. The protrusions 3 are flush with the top of the disc-shaped seat 9.

[0024] Furthermore, the diameter of the expansion disk 4 is larger than the diameter of the disk-shaped base 9, and the expansion disk 4 has a sleeve hole 11 in the middle. The size of the sleeve hole 11 matches the drill bit 14. The inner wall of the sleeve hole 11 has multiple keyways 12 corresponding to the limiting key 13. When the sleeve hole 11 is fitted onto the drill bit 14, the limiting key 13 is placed in the keyway 12. At this time, the bottom of the expansion disk 4 is placed on the disk-shaped base 9, and at the same time, the bottom of the expansion disk 4 is also placed on the protrusion 3. Therefore, after the expansion disk 4 is fitted onto the drill bit 14, it can be fixed. like Figure 2 As shown, because the diameter of the expansion disk 4 is larger than the diameter of the disk seat 9, the edge of the expansion disk 4 extends beyond the disk seat 9. The bottom of the expansion disk 4 is provided with several second drill teeth 7, and the bottom of the expansion disk 4 is provided with a conical surface 6, on which the first drill teeth 8 are distributed. The edge of the expansion disk 4 can enlarge the reaming area at the bottom of the drill bit; that is, after the expansion disk 4 is fitted, the reaming area of ​​the drill bit can be enlarged. Specifically, expansion disk 4 is fixed in place by connector 2, such as Figure 1 As shown, when the top of the drill bit 14 is detachably connected to the connecting seat 2, as Figure 4 As shown, the limit key 13 is spaced a certain distance from the top of the drill head 14. The drill head 14 above the limit key 13 has an external thread 15 on its side. The connecting seat 2 has an internal thread that matches the external thread 15. The connecting seat 2 is threadedly installed on the top of the drill head 14. The connecting seat 2 limits the expansion disk 4. That is, the diameter of the connecting seat 2 is larger than the sleeve hole 11, but smaller than the diameter of the expansion disk 4. When the connecting seat 2 is threadedly connected to the top of the drill head 14, the connecting seat 2 acts like a limiting block to prevent the expansion disk 4 from falling off the top of the drill head 14, so that the expansion disk 4 can be stably positioned on the drill head 14.

[0025] Furthermore, the edge of the disc seat 9 is provided with a first flow groove 10, and the edge of the conical surface 6 is provided with multiple second flow grooves 5. The first flow groove 10 and the second flow groove 5 can accelerate the flow of gravel and mud during the drill bit excavation process.

[0026] Based on the above embodiments, it should be noted that the end of the protruding part 3 extends beyond the side of the connecting seat 2, and the first drill teeth 8 are also distributed outside the side of the connecting seat 2, such as... Figure 6 As shown, when the expansion disc 4 is removed, the drill bit 14 can still rotate and excavate after being connected to the connecting seat 2, except that the drill bit no longer needs to enlarge the hole. It should be noted that the protrusion 3 extends to the outside of the side of the connecting seat 2 to avoid the orthographic projection of the protrusion 3 being located inside the connecting seat 2, which would hinder the drill bit from advancing during excavation. When the drill bit needs to enlarge the hole, the connecting seat 2 is removed from the drill head 14, then the expansion disc 4 is placed on the drill head 14 and the connecting seat 2 is screwed back on. At this time, the entire drill bit is as follows: Figure 1 and Figure 2 As shown, the diameter of the drill bit is increased, which allows the drill bit to enlarge the hole for drilling, and the drill head 14 is easy to assemble onto the drill bit, as well as easy to disassemble.

[0027] Based on the above embodiments, further optimization is possible. Both the drill shank 1 and the drill head 14 are provided with flow holes along their axial direction. The flow holes on the drill head 14 penetrate the bottom of the drill bit and are used to communicate with the drill rod, allowing the lubricant to flow. That is, the lubricant flows from the drill shank 1 into the connecting seat 2, then flows from the connecting seat 2 into the drill head 14, and finally sprays out from the bottom of the drill head 14.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

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