Polycrystalline diamond multi-point cutting drill bit for down-the-hole hammer
By designing a rotatable mounting block and flow channel structure, the problem of drill bit jamming during deep hole excavation was solved, the drill bit diameter was made variable, and the drilling and extraction efficiency of the drill bit was improved.
Patent Information
- Application Number
- CN202520417816.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-11
AI Technical Summary
Existing polycrystalline diamond composite drill bits are prone to jamming during deep hole drilling due to falling debris such as soil, making it difficult to effectively solve the problem of drill bit diameter expansion and contraction.
A polycrystalline diamond multi-point cutting drill bit for down-the-hole hammer is designed. By setting a rotatable mounting block at the bottom of the mounting base, the diameter is expanded during digging using friction, and the diameter is automatically reduced during lifting, combined with a flow channel to discharge debris.
This technology enables the drill bit to have a larger diameter during excavation and a smaller diameter during lifting, solving the jamming problem and improving the drill bit extraction efficiency.
Smart Images
Figure CN223824925U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drill bit technology, specifically a polycrystalline diamond multi-point cutting drill bit for down-the-hole hammers. Background Technology
[0002] Polycrystalline diamond composite drill bits are circular composite discs welded onto a cylindrical cutting tool, which is then mounted on the drill bit body; they are also known as PDC drill bits. During deep hole drilling, the drill bit continuously advances, but debris such as soil can still fall from above the borehole, causing the drill bit to easily jam when lifting. To address this, we propose a polycrystalline diamond multi-point cutting drill bit for down-the-hole hammers. Utility Model Content
[0003] This invention provides a polycrystalline diamond multi-point cutting drill bit for down-the-hole hammers, which has the advantages of increasing diameter during drill bit excavation and decreasing diameter when the drill bit is lifted, thus solving the problems mentioned in the background art.
[0004] The technical solution of this utility model is implemented as follows: A polycrystalline diamond multi-point cutting drill bit for down-the-hole hammer is designed, including a mounting body, a drill bit shank coaxially provided on the top of the mounting body, and multiple movable grooves symmetrically provided at the bottom edge of the mounting body, each movable groove having a blocking surface at one end; each movable groove accommodates a mounting block, the end of the mounting block near the blocking surface is rotatably connected to the movable groove, and each mounting block can rotate to the outside of the mounting body, and at this time the mounting blocks are all placed on the blocking surface; a number of polycrystalline diamonds are provided on the bottom surface of the mounting blocks and the mounting body.
[0005] Preferably, the top of the end of the mounting block near the blocking surface is provided with a mounting post, and the mounting base is provided with mounting holes corresponding to the mounting post, and the mounting post is movably placed in the mounting hole.
[0006] Preferably, each mounting post has a retaining ring groove at its top, and a retaining ring is detachably installed in the retaining ring groove.
[0007] Preferably, holes are provided on the bottom surfaces of both the mounting block and the mounting base, and the roots of each polycrystalline diamond are fixed inside the holes.
[0008] Preferably, a flow channel is provided at the end of the movable channel away from the blocking surface.
[0009] Compared with the prior art, when the drill bit is used, the rotation of the drill bit and the friction with the ground cause each mounting block to rotate out of its respective movable slot, so that the mounting blocks extend to the outside of the mounting base. This can increase the diameter of the mounting base during excavation. When the drill bit is lifted and the mounting base is reversed, the mounting blocks will automatically rotate into the movable slot, thus reducing the diameter of the drill bit and making it easier to pull the drill bit out of the hole. Attached Figure Description
[0010] 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.
[0011] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 .
[0012] Figure 2 This is a schematic diagram of the structure of the present utility model. Figure 2 .
[0013] Figure 3 This is a schematic diagram of the bottom structure of the present invention. Figure 1 .
[0014] Figure 4 This is a schematic diagram of the bottom structure of the present invention. Figure 2 .
[0015] Figure 5 This is the bottom front view of this utility model.
[0016] Figure 6 This is a schematic diagram of the specific structure of the mounting block of this utility model.
[0017] In the diagram: 1. Drill shank; 2. Mounting post; 3. Flow groove; 4. Movable groove; 5. Mounting base; 6. Snap ring groove; 7. Mounting block; 8. Blocking surface; 9. Mounting hole; 10. Polycrystalline diamond. Detailed Implementation
[0018] 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.
[0019] Reference Figures 1 to 6 This utility model provides a technical solution: a polycrystalline diamond multi-point cutting drill bit for down-the-hole hammers, including a mounting base 5, with a drill shank 1 coaxially mounted on the top of the mounting base 5, such as... Figure 1 and Figure 2 As shown, the top of the drill bit shank 1 is provided with a slot, and multiple fixing keys are provided on the side of the drill bit shank 1.
[0020] The most important feature of this application is the rotatable mounting block 7 at the bottom of the mounting base 5, which allows the mounting base 5 to rotate like a... Figure 2 and Figure 4 It extends out of the mounting base 5, and when the mounting base 5 is reversed, it can be like... Figure 1 and Figure 3 They are also neatly folded inside the mounting base 5;
[0021] It should be noted that when the mounting body 5 rotates forward, it digs downwards into the ground. When the mounting body 5 rotates backwards, the mounting block 7 retracts, making the drill bit diameter smaller, which makes it easier to pull the drill bit out of the deep hole.
[0022] The installation relationship of mounting block 7 will be described in detail below, such as Figure 3 and Figure 4 As shown, multiple movable grooves 4 are symmetrically arranged at the bottom edge of the mounting base 5. A mounting block 7 is disposed within each movable groove 4, and the end of the mounting block 7 closest to the blocking surface 8 is rotatably connected to the movable groove 4. Figure 6 As shown, specifically, a mounting post 2 is provided at the top of one end of the mounting block 7 near the blocking surface 8, and mounting holes 9 corresponding to the mounting posts 2 are provided on the mounting base 5. These mounting holes 9 communicate with the movable groove 4, and the mounting posts 2 are movably placed within the mounting holes 9. Figure 1 As shown, the top of the mounting post 2 extends beyond the top of the mounting hole 9, and each mounting post 2 has a retaining spring groove 6. A retaining spring is detachably installed in the retaining spring groove 6. Due to the limiting effect of the retaining spring, the mounting post 2 can be stably placed in the mounting hole 9 without loosening.
[0023] Therefore, each mounting block 7 can be rotated to the outside of the mounting base 5, such as... Figure 5 As shown, each end of the movable groove 4 is provided with a blocking surface 8, and the mounting block 7 is placed on the blocking surface 8, that is, the blocking surface 8 supports the mounting block 7.
[0024] Several polycrystalline diamonds 10 are provided on the bottom surface of both the mounting block 7 and the mounting base 5. Holes are provided on the bottom surface of both the mounting block 7 and the mounting base 5, so that the root of each polycrystalline diamond 10 is fixed in the hole.
[0025] The specific usage process is as follows: when the drill rod drives the drill bit shank 1 forward, the drill bit digs forward. At this time, the drill bit rotates and generates friction with the ground, so that each mounting block 7 can rotate out of each movable slot 4 under the action of friction, so that the mounting block 7 extends to the outside of the mounting base 5, which can expand the diameter of the digging of the mounting base 5.
[0026] When the mounting base 5 is reversed, the mounting block 7 will automatically rotate into the movable groove 4, thus reducing the diameter of the drill bit and making it easier to pull the drill bit out of the hole. Because the movable groove 4 contains mud and other impurities when the mounting block 7 rotates into it, a flow groove 3 is provided at the end of the movable groove 4 away from the blocking surface 8, so that the mounting block 7 can squeeze these impurities out of the flow groove 3.
[0027] 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.
Claims
1. A polycrystalline diamond multi-point cutting drill bit for down-the-hole hammer, comprising a mounting base (5), wherein a drill shank (1) is coaxially provided on the top of the mounting base (5), characterized in that, The mounting base (5) has multiple movable grooves (4) symmetrically arranged at the bottom edge, and each movable groove (4) has a blocking surface (8) at one end; Each movable slot (4) contains a mounting block (7). The end of the mounting block (7) near the blocking surface (8) is rotatably connected to the movable slot (4). Each mounting block (7) can rotate to the outside of the mounting base (5), and at this time, the mounting block (7) is placed on the blocking surface (8). Several polycrystalline diamonds (10) are provided on the bottom surface of both the mounting block (7) and the mounting base (5).
2. The polycrystalline diamond multi-point cutting drill bit for down-the-hole hammer as described in claim 1, characterized in that, The mounting block (7) has a mounting post (2) at the top of one end near the blocking surface (8); The mounting base (5) is provided with mounting holes (9) corresponding to the mounting post (2), and the mounting post (2) is movably placed in the mounting hole (9).
3. The polycrystalline diamond multi-point cutting drill bit for down-the-hole hammer as described in claim 2, characterized in that, The top of each mounting post (2) is provided with a retaining ring groove (6), and a retaining ring is detachably installed in the retaining ring groove (6).
4. The polycrystalline diamond multi-point cutting drill bit for down-the-hole hammer as described in claim 3, characterized in that, Holes are provided on the bottom surfaces of both the mounting block (7) and the mounting base (5), and the roots of each polycrystalline diamond (10) are fixed in the holes.
5. The polycrystalline diamond multi-point cutting drill bit for down-the-hole hammer as described in any one of claims 1-4, characterized in that, The end of the movable groove (4) away from the blocking surface (8) is provided with a flow groove (3).