Mining drill bit for coal mine
By designing carbide scrapers and alloy grinding armor on the coal mine drill bit, combined with multiple perforated structures, the problems of poor coal dust discharge and heat accumulation were solved, achieving high-efficiency drilling and durability.
Patent Information
- Application Number
- CN202520792143.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-24
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-04-24
AI Technical Summary
Traditional coal mine drill bits suffer from problems such as poor coal dust discharge and heat accumulation when drilling coal seams, resulting in low drilling efficiency and short service life.
A mining drill bit for coal mines was designed, which uses a carbide scraper and an alloy grinding armor, combined with a multi-hole structure, including a first feed port, a second feed port, an annular groove chamber and a discharge port, to achieve rapid discharge of coal dust and heat dissipation.
It improves the coal discharge efficiency and drilling efficiency of the drill bit, extends the service life of the drill bit, and reduces maintenance costs.
Smart Images
Figure CN223867945U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mining drill bit technology, and in particular relates to a mining drill bit for coal mines. Background Technology
[0002] In coal mining, the performance of mining drill bits directly affects mining efficiency and cost. Traditional mining drill bits often encounter problems such as poor coal discharge and heat accumulation when drilling coal seams, which not only reduces drilling efficiency but also shortens the service life of the drill bits.
[0003] Specifically, when drilling coal seams, traditional drill bits, due to structural design limitations, tend to accumulate coal dust in front of or around the drill bit, which cannot be discharged in time. This not only increases the drill bit's resistance but also easily leads to overheating, affecting its durability. To solve these problems, the industry has been exploring more efficient and durable mining drill bit designs. However, most existing improvement solutions only involve minor adjustments to local structures or the use of more expensive materials to improve performance. These solutions are either limited in effectiveness or too costly to be widely adopted in practical applications.
[0004] Therefore, there is an urgent need for a new type of mining drill bit for coal mines. Utility Model Content
[0005] The purpose of this utility model is to provide a mining drill bit for coal mines. Through the innovative structural design of the drill bit, it can achieve rapid chip removal and efficient cutting of coal, while reducing heat accumulation and improving the durability and service life of the drill bit.
[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0007] This utility model relates to a mining drill bit for coal mines, comprising a drill rod, a drill bit, a carbide scraper, and an alloy grinding armor; the drill bit is integrally connected to the bottom end of the drill rod; the drill bit includes a hemispherical portion integrally connected to the drill rod; a truncated cone portion integrally connected to the end of the hemispherical portion; a plurality of first feed ports symmetrically arranged on the end face of the truncated cone portion; a plurality of carbide scrapers symmetrically mounted on the end face of the truncated cone portion; a plurality of second feed ports symmetrically arranged on the peripheral side of the truncated cone portion; a plurality of alloy grinding armor plates symmetrically mounted on the peripheral side of the truncated cone portion; an annular groove chamber is formed inside the hemispherical portion; both the first and second feed ports communicate with the annular groove chamber; a plurality of discharge ports are formed on the outer wall of the hemispherical portion.
[0008] As a preferred embodiment of this utility model, the number of the first feed inlets is four; the first feed inlets have a fan-shaped structure.
[0009] As a preferred embodiment of this utility model, the number of the second feed inlets is four; the second feed inlet is a first conical hole structure with a smaller inner diameter and a larger outer diameter.
[0010] As a preferred embodiment of this utility model, the number of discharge ports is two; the discharge ports are second conical hole structures with a larger inner diameter and a smaller outer diameter.
[0011] As a preferred embodiment of this utility model, the cross-section of the carbide scraper is a quarter-circular structure; a row of first stepped through holes is formed between the arc surface and the bottom surface of the carbide scraper; several rows of first threaded blind holes are formed on the end face of the truncated cone; an arc-shaped scraping groove is provided at the junction of the vertical surface and the arc surface of the carbide scraper; the carbide scraper is detachably mounted on the end face of the truncated cone by several first countersunk bolts.
[0012] As a preferred technical solution of this utility model, the alloy grinding armor includes an arc-shaped plate attached to the peripheral side of the truncated cone portion; the arc-shaped plate has a row of second-step through holes; the arc surface of the truncated cone portion has a plurality of second threaded blind holes that are connected to the second-step through holes; the alloy grinding armor is detachably mounted on the arc surface of the truncated cone portion by means of second countersunk bolts; and three rows of inclined carbide grinding heads are fixed on the outer arc surface of the arc-shaped plate.
[0013] As a preferred technical solution of this utility model, the edge of the end face of the truncated cone is provided with a plurality of drainage slots.
[0014] This utility model has the following beneficial effects:
[0015] 1. This utility model features a carbide scraper and a carbide grinding armor on the front and side of the drill bit, respectively. These, along with the first and second feed inlets on the truncated cone section, and the annular groove chamber and discharge port inside the hemispherical section, form a highly efficient coal discharge channel. This design allows coal chips from cutting or grinding to be quickly guided into the drill bit and smoothly discharged through the discharge port, avoiding accumulation and blockage of coal chips, thereby significantly improving the drill bit's coal discharge and drilling efficiency.
[0016] 2. The multi-hole hollow structure design of this utility model not only helps to quickly remove coal dust, but also increases the heat dissipation area of the drill bit, which helps to reduce the heat generated during drilling, thereby reducing heat accumulation and improving the durability and service life of the drill bit.
[0017] 3. This utility model allows both the carbide scraper and the carbide grinding armor to be detachably mounted on the drill bit using countersunk bolts, facilitating replacement and maintenance and reducing the overall maintenance cost of the mining drill bit. Simultaneously, this design enables the drill bit to be flexibly configured according to actual needs, improving its applicability and flexibility.
[0018] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.
[0020] Figure 1 This is a schematic diagram of the structure of the mining drill bit for coal mines according to this utility model.
[0021] Figure 2 for Figure 1 The front view.
[0022] Figure 3 This is an axial front view of the drill pipe and drill bit.
[0023] Figure 4 for Figure 3 Sectional view at point AA.
[0024] Figure 5 This is a schematic diagram of the structure of a cemented carbide scraper.
[0025] Figure 6 This is a schematic diagram of the structure of alloy grinding armor.
[0026] The attached diagram lists the components represented by each number as follows:
[0027] 1-Drill rod, 2-Drill bit, 21-Hemispherical part, 22-Frustum conical part, 23-First feed port, 24-Second feed port, 25-Annular groove chamber, 26-Discharge port, 27-First threaded blind hole, 28-Second threaded blind hole, 29-Discharge groove, 3-Carbide scraper, 31-First step through hole, 32-Arc-shaped scraper groove, 4-Carbide grinding armor, 41-Arc plate, 42-Second step through hole, 43-Carbide grinding head. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Specific Implementation Example 1:
[0030] Please see Figure 1-6 As shown, this utility model is a mining drill bit for coal mines, including a drill rod 1, a drill bit 2, a carbide scraper 3, and an alloy grinding armor 4. The drill bit 2, which is integrally connected to the bottom end of the drill rod 1, is provided. The drill bit 2 includes a hemispherical portion 21 integrally connected to the drill rod 1. A frustum-shaped portion 22, which is integrally connected to the end of the hemispherical portion 21, is provided.
[0031] The truncated cone section 22 has several axisymmetrically arranged first feed ports 23 on its end face. Several carbide scrapers 3 are symmetrically mounted on the end face of the truncated cone section 22. In this embodiment, there are four first feed ports 23. The first feed ports 23 have a fan-shaped structure. The carbide scrapers 3 mounted at the front end of the drill bit 2 scrape the coal seam in front of the drill bit 2, and most of the scraped coal enters the drill bit 2 through the first feed ports 23.
[0032] The carbide scraper 3 has a quarter-circular cross-section. A row of first-step through holes 31 is formed between the arc surface and the bottom surface of the carbide scraper 3. Several rows of axisily symmetrically arranged first threaded blind holes 27 are formed on the end face of the truncated cone portion 22. An arc-shaped scraping groove 32 is provided at the junction of the vertical surface and the arc surface of the carbide scraper 3. The carbide scraper 3 is detachably mounted on the end face of the truncated cone portion 22 by several first countersunk bolts. The inclusion of the carbide grinding head 43 further enhances the grinding capability of the drill bit, enabling the coal seam to be broken up more quickly.
[0033] The conical truncated section 22 has several drainage slots 29 on its end face edge. The design of the drainage slots 29 helps to quickly discharge the cutting or grinding coal dust during drilling, preventing accumulation and thus improving drilling efficiency.
[0034] The truncated cone portion 22 has several axisily symmetrically arranged second feed ports 24 on its circumferential side. Several alloy grinding armor plates 4 are also axisily symmetrically mounted on the circumferential side of the truncated cone portion 22. In this embodiment, there are four second feed ports 24. Each second feed port 24 has a first conical hole structure that is smaller on the inside and larger on the outside. The alloy grinding armor plates 4 mounted on the side of the drill bit 2 grind the coal seam around the drill bit 2 during its rotation. Most of the ground coal enters the drill bit 2 through the second feed ports 24. This structural design allows the coal seam to more easily enter the drill bit 2 for cutting or grinding.
[0035] The alloy grinding armor 4 includes an arc-shaped plate 41 that fits onto the circumferential side of the truncated cone portion 22. The arc-shaped plate 41 has a row of second-step through holes 42. The arc surface of the truncated cone portion 22 has several second threaded blind holes 28 that connect to the second-step through holes 42. The alloy grinding armor 4 is detachably mounted on the arc surface of the truncated cone portion 22 via second countersunk bolts. Three rows of inclined carbide grinding heads 43 are fixed to the outer arc surface of the arc-shaped plate 41. The presence of carbide grinding heads 43 on the surface of the alloy grinding armor 4, which participate in coal seam crushing, further enhances the grinding capability of the drill bit, enabling the coal seam to be crushed more quickly. Both the carbide scraper 3 and the alloy grinding armor 4 are replaceable parts, reducing the overall maintenance cost of the mining drill bit.
[0036] The hemispherical portion 21 has an annular groove chamber 25 inside. Both the first feed inlet 23 and the second feed inlet 24 communicate with the annular groove chamber 25. The outer wall of the hemispherical portion 21 has several discharge ports 26. In this embodiment, there are two discharge ports 26. Each discharge port 26 has a second conical hole structure that is larger inside and smaller outside. This design allows coal dust from cutting or grinding to be discharged more smoothly from the discharge ports 26 after entering the drill bit 2 through the first feed inlet 23 or the second feed inlet 24. The designed coal discharge channel avoids the accumulation and blockage of coal dust, thereby improving the drill bit's coal discharge efficiency and drilling efficiency.
[0037] This invention, through its multi-perforated and hollowed-out structural design, along with the inclusion of a carbide scraper 3 and an alloy grinding armor 4, enables the drill bit to actively or passively guide and quickly discharge the cut or ground coal away from the cutting or grinding surface during coal seam drilling and mining, thus achieving rapid coal discharge. Simultaneously, this structural design also reduces heat generation during coal mining, improving the drill bit's durability and service life.
[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0039] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A mining drill bit for coal mines, characterized in that: It includes a drill rod (1), a drill bit (2), a carbide scraper (3), and an alloy grinding armor (4); the drill rod (1) is provided with the drill bit (2) connected as a whole at its bottom end; The drill bit (2) includes a hemispherical portion (21) that is integrally connected to the drill rod (1); the end of the hemispherical portion (21) is provided with a frustum-shaped portion (22) that is integrally connected to the drill rod (1). The truncated cone portion (22) has several first feed ports (23) arranged symmetrically on its end face; several carbide scrapers (3) are symmetrically mounted on the end face of the truncated cone portion (22). The circumferential side of the truncated cone portion (22) is provided with several second feed ports (24) arranged symmetrically on the circumferential side of the truncated cone portion (22); several alloy grinding armors (4) are symmetrically installed on the circumferential side of the truncated cone portion (22). The hemispherical part (21) has an annular groove chamber (25) inside; the first feed port (23) and the second feed port (24) are both connected to the annular groove chamber (25); the outer wall of the hemispherical part (21) has a plurality of discharge ports (26).
2. The mining drill bit for coal mines according to claim 1, characterized in that, The number of the first feed inlets (23) is four; the first feed inlets (23) are fan-shaped structures.
3. The mining drill bit for coal mines according to claim 1, characterized in that, The number of the second feed inlets (24) is four; the second feed inlets (24) are first conical holes with a smaller inner diameter and a larger outer diameter.
4. The mining drill bit for coal mines according to claim 1, characterized in that, The number of discharge ports (26) is two; the discharge ports (26) are second conical hole structures with a larger inner diameter and a smaller outer diameter.
5. The mining drill bit for coal mines according to claim 1, characterized in that, The carbide scraper (3) has a quarter-circular cross-section; a row of first stepped through holes (31) is opened between the arc surface and the bottom surface of the carbide scraper (3); a number of rows of first threaded blind holes (27) are opened on the end face of the truncated cone (22); an arc-shaped scraping groove (32) is provided at the junction of the vertical surface and the arc surface of the carbide scraper (3); the carbide scraper (3) is detachably installed on the end face of the truncated cone (22) by a number of first countersunk bolts.
6. The mining drill bit for coal mines according to claim 1, characterized in that, The alloy grinding armor (4) includes an arc-shaped plate (41) that fits against the circumferential side of the truncated cone portion (22); the arc-shaped plate (41) has a row of second-step through holes (42); the arc surface of the truncated cone portion (22) has a plurality of second threaded blind holes (28) that are connected to the second-step through holes (42); the alloy grinding armor (4) is detachably mounted on the arc surface of the truncated cone portion (22) by means of second countersunk bolts; three rows of inclined carbide grinding heads (43) are fixed on the outer arc surface of the arc plate (41).
7. The mining drill bit for coal mines according to claim 1, characterized in that, The edge of the end face of the truncated cone portion (22) is provided with several drainage slots (29).