Easy-return reamer

Abstract

This application relates to the technical field of rock drilling tools. An easy-return reaming drill bit includes a drill head and a body. The drill head is coaxially connected to one end of the body. A first annular groove is provided at the connection between the drill head and the body. Several guide wings are connected to the outer periphery of the body, and these guide wings are circumferentially spaced around the axis of the body. An auxiliary slag discharge groove is provided between two adjacent guide wings, and the auxiliary slag discharge groove is connected to the first annular groove. The guide wings contact the rock borehole wall, guiding the drill bit, reducing the possibility of drill bit deviation, improving the straightness of the drilled hole, improving the stability of the drill bit during drilling, and extending the service life of the drill bit and the rock drill.

Description

Technical Field

[0001] This application relates to the technical field of rock drilling tools, and in particular to an easy-return reaming drill bit. Background Technology

[0002] Rock drilling tools are a slender drill rod system composed of components such as drill bit, drill rod, and drill tail. They are the main tools used for drilling rocks in construction projects in fields such as mining, transportation and road construction, hydropower projects, and urbanization.

[0003] Drill bits are categorized into flat-head, cross-shaped, X-shaped, and ball-tooth types based on their application. Flat-head bits are suitable for drilling soft rock formations with light rock drills and are easy to grind. Cross-shaped and X-shaped bits are suitable for drilling fractured and highly corrosive rock formations under conditions requiring rock drills with greater impact power, and they have strong resistance to radial corrosion. Ball-tooth bits are more versatile than sheet-like bits under conditions requiring rock drills with greater impact power, offering higher drilling speed and lifespan, and producing more rounded holes.

[0004] Reference Figure 1 Existing ball-tooth drill bits generally have a cylindrical tail, and the diameter of this cylinder is smaller than the diameter of the drill bit head. Therefore, when drilling rocks or holes, especially in soft or fractured rock, or at deeper depths, the drill bit is prone to deviation, resulting in an arc-shaped hole instead of a straight one. This can cause the drill bit to get stuck in the hole and be difficult to remove. Utility Model Content

[0005] To improve the stability of drilling, this application provides an easy-return reaming drill bit.

[0006] This application provides a technical solution using the following approach:

[0007] An easy-return reaming drill bit includes a drill head and a body. The drill head is coaxially connected to one end of the body. A first annular groove is provided at the connection between the drill head and the body. A plurality of guide wings are connected to the outer periphery of the body. The guide wings are circumferentially distributed around the axis of the body. An auxiliary slag discharge groove is provided between two adjacent guide wings. The auxiliary slag discharge groove is connected to the first annular groove.

[0008] By adopting the above technical solution, the guide wing contacts the rock borehole wall, guides the drill bit, reduces the possibility of drill bit deviation, improves the straightness of the drilled hole, improves the stability of the drill bit, and increases the service life of the drill bit and rock drill.

[0009] Preferably, the end of the trouser body away from the drill head is connected to several reverse scraping wings, and the several reverse scraping wings are circumferentially distributed around the axis of the trouser body.

[0010] By adopting the above technical solution, the drill bit is reversed during drill retraction, and the reverse scraping blade cleans the hole wall, effectively preventing drill jamming and improving production efficiency.

[0011] Preferably, the drill bit includes an advanced drill bit and a rear drill bit. The rear drill bit is coaxially connected to one end of the trouser body, and the advanced drill bit is coaxially connected to the end of the rear drill bit away from the trouser body. A second annular groove is provided at the connection between the advanced drill bit and the rear drill bit. The maximum outer diameter of the advanced drill bit is smaller than the maximum outer diameter of the rear drill bit.

[0012] By adopting the above technical solution, drilling is first performed using an advanced drill bit with a smaller diameter to reduce the contact area between the drill bit and the hole wall. Then, a subsequent drill bit is used to enlarge the diameter of the rock hole processed by the advanced drill bit, thereby reducing drill bit wear and improving drill bit service life and drilling efficiency.

[0013] Preferably, the outer periphery of the advanced drill bit is provided with a plurality of second chip removal grooves, which are distributed circumferentially around the axis of the advanced drill bit. The second chip removal grooves are connected to the second annular groove. The outer periphery of the rear drill bit is provided with a first chip removal groove, which is connected to the first annular groove. The number of the first chip removal grooves is the same as the number of auxiliary slag removal grooves and corresponds one-to-one.

[0014] By adopting the above technical solution, the several second chip removal grooves set on the outer periphery of the advanced drill bit can effectively guide the chips to be discharged into the second annular groove. The first chip removal groove set on the outer periphery of the rear drill bit is connected to the first annular groove, which can discharge the chips on the side of the rear drill bit close to the advanced drill bit through the first chip removal groove to the second annular groove, and then discharge them out of the rock drilling hole through the auxiliary chip removal groove. This reduces the possibility of reduced drilling efficiency or stuck drill bit caused by chip accumulation, and improves the stability and working efficiency of the drill bit.

[0015] Preferably, the end of the trouser body away from the rear entry drill bit is provided with a water inlet channel, the end of the advanced drill bit away from the rear entry drill bit is provided with a second flushing hole, and the end of the rear entry drill bit away from the trouser body is provided with a first flushing hole. The first flushing hole and the second flushing hole are connected to the water inlet channel.

[0016] By adopting the above technical solution, the water inlet channel is connected to other components to provide water to the first flushing hole and the second flushing hole, so that water can be sprayed out from the first flushing hole and the second flushing hole respectively to clean the debris generated during the operation of the rear and front drill bits. This facilitates the discharge of debris from the first and second chip removal grooves, improves chip removal efficiency, reduces the possibility of drill bit jamming caused by chip accumulation, and improves the stability of the drill bit drilling process and the service life of the drill bit.

[0017] Preferably, there are two first flushing holes, which are symmetrically distributed along the axis perpendicular to the trouser body.

[0018] By adopting the above technical solution, the first flushing holes are set to be two and symmetrically distributed along the axis perpendicular to the trouser body, so that water can enter the working area of ​​the drill bit from multiple directions and positions, improving the chip removal efficiency, reducing the possibility of the drill bit deflecting due to unilateral water flow, and improving the stability of the drill bit drilling.

[0019] Preferably, the bottom of the first annular groove is provided with two reverse flushing holes, which are symmetrically distributed along the axis perpendicular to the trouser body.

[0020] By adopting the above technical solution, two reverse flushing holes are set and symmetrically distributed along the axis perpendicular to the trouser body, so that water can enter the first annular groove from multiple directions and positions, thereby cleaning the debris in the first annular groove, improving the chip removal efficiency, reducing the possibility of the drill bit deflecting due to unilateral water flow, and improving the stability of the drill bit drilling.

[0021] Preferably, a connecting ring groove is provided on the inner wall of the water inlet channel at the end away from the drill bit.

[0022] By adopting the above technical solution, the connection ring groove facilitates the connection between the water inlet channel and other components. When external liquid first enters the connection ring groove and then enters the water inlet channel from the connection ring groove, the cross-sectional area of ​​the connection ring groove is larger than the cross-sectional area of ​​the water inlet channel, which increases the pressure in the water inlet channel. This facilitates the smooth flow of liquid in the water inlet channel through the first flushing hole, the second flushing hole, and the reverse flushing hole, effectively assisting the drill bit in drilling and improving the stability of the drill bit in drilling.

[0023] Preferably, the maximum outer diameter of the guide wing is smaller than the maximum outer diameter of the drill bit.

[0024] By adopting the above technical solution, the maximum outer diameter of the guide wing is smaller than the maximum outer diameter of the drill bit, so that there is a gap between the outer wall of the guide wing and the wall of the drilling hole, which facilitates the discharge of debris generated by the drill bit cutting through the gap.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The guide vane contacts the rock borehole wall, guiding the drill bit, reducing the possibility of drill bit deviation, improving the straightness of the drilled hole, improving the stability of the drill bit, and increasing the service life of the drill bit and rock drill.

[0027] 2. When retracting the drill bit, reverse the drill bit and use the reverse scraping blade to clean the hole wall, which effectively prevents the drill bit from getting stuck and improves production efficiency.

[0028] 3. First, drill the hole using an advanced drill bit with a smaller diameter to reduce the contact area between the drill bit and the hole wall. Then, use a follow-up drill bit to enlarge the diameter of the hole drilled by the advanced drill bit, thereby reducing drill bit wear and improving drill bit life and drilling efficiency. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the existing technology.

[0030] Figure 2 This is a schematic diagram of the structure of an easy-return reamer.

[0031] Figure 3 This is a schematic diagram of the structure of an easy-return reamer.

[0032] Figure 4 This is a cross-sectional view of an easy-return reamer, mainly showing the second flushing hole.

[0033] Figure 5 This is a cross-sectional view of an easy-return reamer, mainly showing the first flushing hole.

[0034] Figure 6 This is a cross-sectional view of an easy-return reamer, mainly showing the reverse flushing hole.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Drill bit; 11. Advanced drill bit; 111. Second chip removal groove; 112. Second inclined surface; 12. Rear drill bit; 121. First chip removal groove; 122. First flushing hole; 123. First inclined surface; 124. Connecting groove; 13. Second annular groove; 14. Second flushing hole;

[0037] 2. Trouser body; 21. Guide wing; 22. Auxiliary slag discharge trough; 23. Reverse scraping wing; 24. Connecting ring groove;

[0038] 3. First annular groove;

[0039] 4. Water inlet channel;

[0040] 5. Reverse flushing hole;

[0041] 6. Alloy ball teeth. Detailed Implementation

[0042] The present application will be further described in detail below with reference to the accompanying drawings.

[0043] Reference Figure 2This application discloses an easy-return reaming drill bit, comprising a body 2 and a drill bit 1. The drill bit 1 includes an advanced drill bit 11 and a rear drill bit 12. The rear drill bit 12 is coaxially fixedly connected to one end of the body 2. A first annular groove 3 is provided at the connection between the rear drill bit 12 and the body 2, and the connection between the bottom of the first annular groove 3 and the two side walls of the first annular groove 3 is a rounded transition. A first inclined surface 123 is provided on the outer periphery of the end of the rear drill bit 12 away from the body 2. The advanced drill bit 11 is coaxially fixedly connected to the end of the rear drill bit 12 away from the body 2, and the maximum outer diameter of the advanced drill bit 11 is smaller than the maximum outer diameter of the rear drill bit 12. A second annular groove 13 is provided at the connection between the advanced drill bit 11 and the rear drill bit 12, and a second inclined surface 112 is provided on the outer periphery of the end of the advanced drill bit 11 away from the rear drill bit 12.

[0044] Reference Figure 2 and Figure 3 A plurality of guide wings 21 are fixedly connected to the outer periphery of the trouser body 2, and the guide wings 21 are distributed circumferentially around the axis of the trouser body 2. In this embodiment, there are eight guide wings 21, which are evenly distributed circumferentially around the axis of the trouser body 2. The maximum outer diameter of the guide wings 21 is smaller than the maximum outer diameter of the drill bit head 1. An auxiliary slag discharge groove 22 is provided between two adjacent guide wings 21, and the auxiliary slag discharge groove 22 is connected to the first annular groove 3.

[0045] Reference Figure 3 and Figure 4 In this embodiment, the cross-section of the auxiliary slag discharge trough 22 is semi-circular, and the minimum distance from the auxiliary slag discharge trough 22 to the axis of the trouser body 2 is less than the distance from the bottom of the first annular groove 3 to the axis of the trouser body 2.

[0046] Reference Figure 3 A plurality of reverse scraping wings 23 are fixedly connected to one end of the trouser body 2 away from the rear entry drill bit 12. The plurality of reverse scraping wings 23 are distributed at intervals around the circumferential axis of the trouser body 2. In this embodiment, there are four reverse scraping wings 23, which are evenly distributed around the axis of the trouser body 2 in four directions. Two auxiliary slag discharge grooves 22 are provided between two adjacent reverse scraping wings 23.

[0047] Reference Figure 2 The advanced drill bit 11 has a plurality of second chip removal grooves 111 on its outer periphery. The second chip removal grooves 111 are connected to the second annular groove 13, and the plurality of second chip removal grooves 111 are circumferentially spaced around the axis of the advanced drill bit 11. In this embodiment, there are three second chip removal grooves 111, which are evenly distributed circumferentially around the axis of the advanced drill bit 11. The rear drill bit 12 has a first chip removal groove 121 on its outer periphery. The first chip removal groove 121 is connected to the first annular groove 3, and the number of first chip removal grooves 121 is the same as the number of auxiliary slag removal grooves 22 and corresponds one-to-one.

[0048] Reference Figure 5The end of the trouser body 2 furthest from the advanced drill bit 11 is coaxially provided with a water inlet channel 4, and the inner wall of the water inlet channel 4 furthest from the advanced drill bit 11 is coaxially provided with a connecting ring groove 24. The end of the advanced drill bit 11 furthest from the rear drill bit 12 is coaxially provided with a second flushing hole 14, which is connected to the water inlet channel 4. In this embodiment, the angle between the axis of the second flushing hole 14 and the axis of the water inlet channel 4 is 86°.

[0049] Reference Figure 2 and Figure 4 A connecting groove 124 is provided at the first inclined surface 123, which is connected to the first chip removal groove 121. There are two connecting grooves 124, and the two first chip removal grooves 121 are symmetrically distributed along the axis perpendicular to the trouser body 2. A first flushing hole 122 is provided at the bottom of the first connecting groove on the side away from the first chip removal groove 121. The first flushing hole 122 is connected to the water inlet channel 4. The end of the first flushing hole 122 near the water inlet channel 4 is inclined away from the advanced drill bit 11. The axes of the two first flushing holes 122 coincide with the axis of the water inlet channel 4 on surface A. In this embodiment, the angle between the axis of the first flushing hole 122 and the axis of the water inlet channel 4 is 43°.

[0050] Reference Figure 2 and Figure 6 The bottom of the first annular groove 3 is provided with a reverse flushing hole 5, which is connected to the water inlet channel 4. The end of the reverse flushing hole 5 near the water inlet channel 4 is inclined towards the side near the advanced drill bit 11. There are two reverse flushing holes 5, and the axes of the two reverse flushing holes 5 coincide with the axis of the water inlet channel 4 on surface B, which is perpendicular to surface A. In this embodiment, the angle between the axis of the reverse flushing hole 5 and the axis of the water inlet channel 4 is 60°.

[0051] Reference Figure 2 In this embodiment, the depth of the first chip removal groove 121 corresponding to the first flushing hole 122 and the reverse flushing hole 5 is greater than the depth of the other first chip removal grooves 121.

[0052] An easy-return reaming drill bit also includes alloy ball teeth 6. Several alloy ball teeth 6 are provided, and are respectively fixedly connected to the outer walls of the advanced drill bit 11 and the rear drill bit 12. In this embodiment, there are eighteen alloy ball teeth 6. One alloy ball tooth 6 is fixedly connected to the end of the advanced drill bit 11 away from the rear drill bit 12, and three alloy ball teeth 6 are fixedly connected to the second inclined surface 112. The three alloy ball teeth 6 are evenly distributed circumferentially around the axis of the advanced drill bit 11. An alloy ball tooth 6 is provided between two adjacent second chip removal grooves 111. The fourteen alloy ball teeth 6 are divided into two groups, and the two groups of alloy ball teeth 6 are symmetrically distributed along a direction perpendicular to surface A. Seven alloy ball teeth 6 in the same group are evenly distributed on the first inclined surface 123.

[0053] The implementation principle of an easy-return reaming drill bit in this application embodiment is as follows: When drilling, the advanced drill bit 11 abuts against the drilling hole, the drill bit rotates, and the alloy ball teeth 6 at the advanced drill bit 11 cuts first. The generated chips are transported to the second annular groove 13 through the second chip removal groove 111. When the alloy ball teeth 6 at the rear drill bit 12 cuts, the chips produced by the cutting of the advanced drill bit 11 and the rear drill bit 12 are transported to the first annular groove 3 through the first chip removal groove 121. When the guide wing 21 enters the hole, the guide wing 21 cleans the chips in the hole, and the chips are sent out through the auxiliary slag removal groove 22.

[0054] After drilling is completed, the drill bit reverses, and the reverse scraping blade 23 cleans up the debris remaining in the hole, making it easier to remove the drill bit.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An easy-return reaming drill bit, characterized in that: It includes a drill bit (1) and a trouser body (2); the drill bit (1) is coaxially connected to one end of the trouser body (2); a first annular groove (3) is provided at the connection between the drill bit (1) and the trouser body (2); a number of guide wings (21) are connected to the outer periphery of the trouser body (2); the number of guide wings (21) are circumferentially distributed around the axis of the trouser body (2); an auxiliary slag discharge groove (22) is provided between two adjacent guide wings (21); the auxiliary slag discharge groove (22) is connected to the first annular groove (3).

2. The retractable reamer bit of claim 1, wherein: The trouser body (2) has several reverse scraping wings (23) connected to one end away from the drill head (1); the several reverse scraping wings (23) are distributed circumferentially around the axis of the trouser body (2).

3. The easy-return reaming drill bit according to claim 1, characterized in that: The drill bit (1) includes an advanced drill bit (11) and a rear drill bit (12); the rear drill bit (12) is coaxially connected to one end of the trouser body (2); the advanced drill bit (11) is coaxially connected to the end of the rear drill bit (12) away from the trouser body (2); a second annular groove (13) is provided at the connection between the advanced drill bit (11) and the rear drill bit (12); the maximum outer diameter of the advanced drill bit (11) is smaller than the maximum outer diameter of the rear drill bit (12).

4. The easy-return reaming drill bit according to claim 3, characterized in that: The advanced drill bit (11) is provided with a plurality of second chip removal grooves (111) on its outer periphery; the plurality of second chip removal grooves (111) are distributed circumferentially around the axis of the advanced drill bit (11); the second chip removal grooves (111) are connected to the second annular groove (13); the rear drill bit (12) is provided with a first chip removal groove (121) on its outer periphery; the first chip removal groove (121) is connected to the first annular groove (3); the number of the first chip removal grooves (121) is the same as the number of the auxiliary slag removal grooves (22) and they correspond one-to-one.

5. The easy-return reaming drill bit according to claim 4, characterized in that: The trouser body (2) has a water inlet channel (4) at the end away from the rear entry drill bit (12); the advanced drill bit (11) has a second flushing hole (14) at the end away from the rear entry drill bit (12); the rear entry drill bit (12) has a first flushing hole (122) at the end away from the trouser body (2); the first flushing hole (122) and the second flushing hole (14) are connected to the water inlet channel (4).

6. The easy-return reaming drill bit according to claim 5, characterized in that: There are two first flushing holes (122); the two first flushing holes (122) are symmetrically distributed along the axis perpendicular to the trouser body (2).

7. The easy-return reaming drill bit according to claim 5, characterized in that: The bottom of the first annular groove (3) is provided with two reverse flushing holes (5); the two reverse flushing holes (5) are symmetrically distributed along the axis perpendicular to the trouser body (2).

8. The reversible reaming drill bit according to claim 7, characterized in that: The water inlet channel (4) has a connecting ring groove (24) on the inner wall of the end away from the drill bit (1).

9. The reversible reaming drill bit according to claim 1, characterized in that: The maximum outer diameter of the guide wing (21) is smaller than the maximum outer diameter of the drill bit (1).

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