Single-row drill bit facilitating cooling and slagging

Abstract

The utility model relates to rock drilling tool accessory technical field especially, it relates to a one word type drill bit convenient to cooling deslagging, through being equipped with annular burnishing portion in the side of drill bit body near top, the burnishing portion forms the step with top, one aspect has reduced drill bit overall volume, through setting up burnishing portion and the step formed, the water flow that water hole sprays can be along deslagging groove drainage to burnishing portion, in the rock drilling process, can make the burnishing portion and rock wall form the gap, and reduce the friction resistance of deslagging through the burnishing portion, reduce the difficult situation of deslagging of drill bit when breaking complex rock layer, can effectively accelerate heat dissipation in the process of driving to reduce the influence of high temperature to drill bit strength, make the side of drill bit body near top can obtain sufficient cooling in the rock drilling process, because this part is near drill bit top, so the drill bit top this easy heating part also can obtain sufficient cooling.

Description

Technical Field

[0001] This utility model relates to the technical field of rock drilling tool accessories, and in particular to a one-piece drill bit that facilitates cooling and slag removal. Background Technology

[0002] Chinese patent CN2895697Y discloses a single-line energy-saving drill bit. In its structure, the side near the top of the drill bit is a cylindrical arc surface that almost fits tightly against the hole wall. The lower end of the slag discharge groove exceeds half the total height of the drill bit. Although the side of the middle part of the drill bit has an inwardly recessed annular recess for slag discharge, during rock drilling, the water sprayed from the water holes on the inclined surface of the slag discharge groove can play a role in slag discharge and cooling. However, during rock drilling, the water sprayed from the water holes cannot fully discharge slag and cool the top side of the drill bit. Since the drill bit is made of a high-strength alloy, its surface is rough. The cylindrical arc surface near the top of the drill bit does not discharge slag and cool properly, and is prone to generating high heat through friction with rock powder, thus affecting the performance of the drill bit. Utility Model Content

[0003] The technical problem to be solved by this utility model is: how to improve the structure of the one-line drill bit and solve the problem of insufficient slag removal and cooling in the cylindrical arc surface part of the top of the drill bit.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A straight-line drill bit for easy cooling and slag removal includes a drill bit body. The top of the drill bit body is provided with a straight-line pointed end. Inclined slag removal grooves are provided on both sides of the top of the drill bit body. The slag removal grooves are provided with water holes that communicate with the inner cavity of the drill bit body. An annular polished part is provided on the side of the drill bit body near the top. A step is formed between the polished part and the top.

[0006] Furthermore, in the aforementioned straight-line drill bit structure that facilitates cooling and slag removal, the lower end of the slag removal groove is lower than the lower end of the annular polishing section.

[0007] Furthermore, in the aforementioned straight-line drill bit structure that facilitates cooling and slag removal, the material of the drill bit body is 42CrMo.

[0008] Furthermore, in the aforementioned straight-line drill bit structure that facilitates cooling and slag removal, the axial distance between the upper end of the polished part and the upper end of the straight-line tip is 1-2 cm.

[0009] Furthermore, in the aforementioned straight-line drill bit structure that facilitates cooling and slag removal, the depth of the step formed between the polished part and the top is 1-3mm.

[0010] Furthermore, in the aforementioned straight-line drill bit structure that facilitates cooling and slag removal, the height of the polishing section is 2-4 cm.

[0011] The beneficial effects of this utility model are as follows: In the one-line drill bit structure that facilitates cooling and slag removal, an annular polished section is provided on the side of the drill bit body near the top, forming a step between the polished section and the top. This reduces the overall volume of the drill bit. By setting the polished section and forming the step, the water jet from the water hole can be guided along the slag removal groove to the polished section. During rock drilling, a gap is formed between the polished section and the rock wall, and the polished section reduces the frictional resistance of slag removal, thus reducing the difficulty of slag removal when breaking complex rock strata. It effectively accelerates heat dissipation during excavation to reduce the impact of high temperature on the drill bit strength. The side of the drill bit body near the top is sufficiently cooled during rock drilling, as this part is close to the top of the drill bit, thus ensuring sufficient cooling of the easily heated top part. This effectively accelerates heat dissipation during excavation to reduce the impact of high temperature on the drill bit strength, ensuring sufficient cooling of the side of the drill bit body near the top during rock drilling, as this part is close to the top of the drill bit, thus ensuring sufficient cooling of the easily heated top part of the drill bit. Attached Figure Description

[0012] Figure 1 This is a front view of a single-line drill bit structure according to a specific embodiment of the present utility model;

[0013] Figure 2 This is a left view of a single-line drill bit structure according to a specific embodiment of the present utility model;

[0014] Figure 3 This is a top view of a single-line drill bit structure according to a specific embodiment of the present utility model;

[0015] Label Explanation:

[0016] 1. Drill bit body; 11. Straight tip; 12. Slag discharge groove; 13. Water hole; 14. Polishing section; 15. Step. Detailed Implementation

[0017] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] Please refer to Figures 1 to 3 The present invention relates to a straight-line drill bit that facilitates cooling and slag removal. It includes a drill bit body 1, the top of which is provided with a straight-line pointed end. Inclined slag removal grooves 12 are provided on both sides of the top of the drill bit body 1. The slag removal grooves 12 are provided with water holes 13 that communicate with the inner cavity of the drill bit body 1. An annular polished part 14 is provided on the side of the drill bit body 1 near the top. A step 15 is formed between the polished part 14 and the top.

[0019] In the above embodiments, on the one hand, the overall volume of the drill bit is reduced. By setting the polishing part 14 and forming the step 15, the water flow sprayed from the water hole 13 can be guided to the polishing part 14 along the slag discharge groove 12. During the rock drilling process, the polishing part 14 can form a gap with the rock wall, and the polishing part 14 reduces the frictional resistance of slag discharge, reducing the difficulty of slag discharge when the drill bit is breaking complex rock layers. It can effectively accelerate heat dissipation during the tunneling process to reduce the impact of high temperature on the strength of the drill bit. The side of the drill bit body 1 near the top can be sufficiently cooled during the rock drilling process. Because this part is close to the top of the drill bit, the top of the drill bit, which is prone to heat generation, can also be sufficiently cooled.

[0020] In a preferred embodiment, the lower end of the slag discharge trough 12 is lower than the lower end of the annular polishing section 14.

[0021] In the above embodiments, the function of the slag discharge trough 12 is to guide the water flow to the polishing section 14. The water flows in the gap between the polishing section 14 and the rock wall, thus preventing rock slag from being retained on the side wall of the drill bit and generating frictional heat.

[0022] In a preferred embodiment, the material of the drill bit body 1 is 42CrMo.

[0023] In the above embodiments, 42CrMo has the advantage of high strength, but its casting surface is rough. During rock drilling, rock slag is easily trapped on the side wall near the top of the drill bit, causing frictional resistance and heat generation. This utility model reduces the frictional resistance and heat generation between the slag and the drill bit by setting a polished part 14 on the side, and also facilitates water flow for slag removal and cooling.

[0024] In a preferred embodiment, the axial distance between the upper end of the polished part 14 and the upper end of the straight pointed end 11 is 1-2 cm.

[0025] In the above embodiments, the polishing section 14 is located near the top, so that the cooling water can sufficiently cool the heated part of the drill bit.

[0026] In a preferred embodiment, the depth of the step 15 formed between the polished portion 14 and the top is 1-3 mm.

[0027] In the above embodiments, the depth of step 15 should not be too deep, otherwise it will affect the overall strength of the drill bit, nor should it be too shallow, otherwise it will be difficult to remove slag from the drill bit.

[0028] In a preferred embodiment, the height of the polishing section 14 is 2-4 cm.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A straight-line drill bit for easy cooling and slag removal, characterized in that, The device includes a drill bit body, the top of which has a straight pointed end, and inclined slag discharge grooves on both sides of the top of the drill bit body. The slag discharge grooves have water holes that communicate with the inner cavity of the drill bit body. The side of the drill bit body near the top has an annular polishing section, and a step is formed between the polishing section and the top.

2. The straight-line drill bit for easy cooling and slag removal according to claim 1, characterized in that, The lower end of the slag discharge trough is lower than the lower end of the annular polishing section.

3. The straight-line drill bit for easy cooling and slag removal according to claim 1, characterized in that, The material of the drill bit body is 42CrMo.

4. The straight-line drill bit for easy cooling and slag removal according to claim 1, characterized in that, The axial distance between the upper end of the polished part and the upper end of the straight pointed end is 1-2cm.

5. The straight-line drill bit for easy cooling and slag removal according to claim 1, characterized in that, The depth of the step formed between the polished part and the top is 1-3mm.

6. The straight-line drill bit for easy cooling and slag removal according to claim 1, characterized in that, The height of the polishing section is 2-4 cm.

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