Large-diameter rapid hole-forming drill bit and drilling tool

Abstract

The large-diameter rapid hole-forming drill bit comprises a drill bit body, a cutting part is arranged at one end of the drill bit body, and a connecting part is arranged at the other end of the drill bit body; a first-stage broaching gauge protection part and a second-stage broaching gauge protection part are sequentially arranged between the cutting part and the connecting part, the outer diameter of the first-stage broaching gauge protection part is larger than the outer diameter of the cutting part and smaller than the outer diameter of the second-stage broaching gauge protection part, and the outer diameter of the second-stage broaching gauge protection part is consistent with the target hole diameter. The reaming operation of different hole diameters can be completed through one-time drilling, the drill bit does not need to be replaced for multiple times, the drilling operation is prevented from being suspended due to replacement of the drill bit, the construction process is continuous and uninterrupted, the construction time is remarkably saved, meanwhile, the operation error situation possibly caused by frequent replacement of the drill bit is reduced, and the construction efficiency is improved. And the safety in the construction process is effectively improved, and smooth construction is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drilling construction drilling tool, specifically relates to a large -diameter quick hole forming drill bit and drilling tool. BACKGROUND

[0002] In the current drilling operation field, especially in the large-diameter drilling construction process, there is a technical problem that significantly affects the construction effect and quality.

[0003] The traditional drilling method needs to use multiple different types of drill bits to gradually complete the drilling operation when facing the demand of large-diameter drilling. First, it needs to stop drilling operation every time the drill bit is replaced, which not only consumes time but also interrupts the continuity of the entire construction process. Secondly, frequent replacement of drill bits increases the construction risk and has the possibility of equipment damage and personnel injury due to improper operation. Thirdly, the process of frequent replacement of drill bits significantly prolongs the construction period of the entire drilling operation. Since the depth of large-diameter drilling is often large, the time cost accumulated due to the replacement of drill bits accounts for a significant proportion in the entire engineering cycle. Therefore, there is an urgent need for a large-diameter quick hole forming drill bit and drilling tool. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model provides a large-diameter quick hole forming drill bit and drilling tool.

[0005] The utility model discloses a large-diameter quick hole forming drill bit, including drill bit body, the one end of drill bit body sets up cutting part, and the other end sets up connecting portion;

[0006] The cutting part and the connecting portion are sequentially provided with a first hole expanding and diameter maintaining part and a second hole expanding and diameter maintaining part, the outer diameter of the first hole expanding and diameter maintaining part is greater than the outer diameter of the cutting part and less than the outer diameter of the second hole expanding and diameter maintaining part, and the outer diameter of the second hole expanding and diameter maintaining part is consistent with the target hole diameter;

[0007] The cutting part is a three-winged scraper, the three-winged scraper is fixedly installed at the end of the drill bit body, and alloy cutting blades are arranged on the side of the cutting surface of the three-winged scraper;

[0008] The first hole expanding and diameter maintaining part includes a plurality of first diameter maintaining ribs, and the plurality of first diameter maintaining ribs are uniformly arranged on the outer circumferential surface of the drill bit body;

[0009] The cutting surface of the plurality of first diameter maintaining ribs is provided with a first alloy hole expanding blade on the outer side of the side close to the cutting part;

[0010] The second hole expanding and diameter maintaining part includes a ring-shaped fixed part and a plurality of second diameter maintaining ribs, the ring-shaped fixed part is sleeved on the drill bit body, and is fixedly connected with the drill bit body;

[0011] A plurality of the second gage ribs are uniformly arranged on the outer circumferential surface of the annular fixing part; and a second alloy reaming blade is arranged on the cutting surface of each of the plurality of second gage ribs.

[0012] As a further improvement of the utility model, the drill bit body is provided with a drilling fluid flow channel along the axial direction thereof; and a plurality of water eyes are arranged on the end of the drill bit body corresponding to the three-winged drag bit, and the plurality of water eyes are in communication with the drilling fluid flow channel.

[0013] As a further improvement of the utility model, the number of the first gage ribs and the second gage ribs is not less than four.

[0014] The utility model also discloses a drilling tool comprising the large-diameter rapid hole-forming drill bit.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] The utility model has the advantages that the structure is simple, the hole reaming operation of different diameters can be completed by one-time drilling through the arrangement of the cutting part, the first-stage hole reaming gage part and the second-stage hole reaming gage part, the drill bit does not need to be replaced for multiple times, the drilling operation is not suspended due to the replacement of the drill bit, the construction process is continuous and uninterrupted, the construction time is obviously saved, the operation error caused by the frequent replacement of the drill bit, such as the damage of equipment and the injury of personnel caused by improper operation, is reduced, the safety in the construction process is improved, and the smooth construction is ensured.

[0017] The utility model can effectively reduce the time cost caused by the replacement of the drill bit, can make the project be completed more efficiently, and can reduce the project cost and improve the economic benefit as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of a large-diameter rapid hole-forming drill bit according to an embodiment of the utility model.

[0019] In the drawings:

[0020] 1, drill bit body; 11, water eye; 2, cutting part; 21, three-winged drag bit; 22, alloy cutting blade; 3, first-stage hole reaming gage part; 31, first gage rib; 4, second-stage hole reaming gage part; 41, annular fixing part; 42, second gage rib; 5, connecting part;

[0021] 32, first alloy reaming blade; 43, second alloy reaming blade. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The present invention will now be described in further detail with reference to the accompanying drawings:

[0026] like Figure 1 As shown, a large-diameter rapid drilling drill bit provided by this utility model includes a drill bit body 1. One end of the drill bit body 1 is provided with a cutting part 2, and the other end is provided with a connecting part 5. A primary hole-reaming and diameter-maintaining part 3 and a secondary hole-reaming and diameter-maintaining part 4 are provided sequentially between the cutting part 2 and the connecting part 5. The outer diameter of the primary hole-reaming and diameter-maintaining part 3 is larger than the outer diameter of the cutting part 2 and smaller than the outer diameter of the secondary hole-reaming and diameter-maintaining part 4. The outer diameter of the secondary hole-reaming and diameter-maintaining part 4 is consistent with the target hole diameter.

[0027] In this embodiment, by setting the cutting part 2, the first reaming and gage-keeping part 3 and the second reaming and gage-keeping part 4, the reaming operation of different hole diameters can be completed in one drilling, without the need to replace the drill bit multiple times, avoiding the suspension of the drilling operation due to the replacement of the drill bit, making the construction process continuous and uninterrupted, significantly saving the construction time, and at the same time, reducing the operation errors that may occur due to the frequent replacement of the drill bit, such as the damage of equipment and the injury of personnel caused by improper operation, effectively improving the safety during the construction process and ensuring the smooth construction; for the drilling engineering with large diameter and large depth, the time cost accumulated due to the replacement of the drill bit can be effectively reduced, so that the engineering can be more efficiently completed, and the overall engineering cost is reduced and the economic benefit is improved.

[0028] Specifically,

[0029] As Figure 1 shown in the above embodiment, preferably, the cutting part 2 is a three-winged drag bit 21 fixedly installed at the end of the drill bit body 1, and the side edge of the cutting surface of the three-winged drag bit 21 is provided with an alloy cutting blade 22.

[0030] In the above embodiment, preferably, the drill bit body 1 is provided with a drilling fluid flow channel along the axial direction thereof; and the end of the drill bit body 1 is provided with a plurality of water eyes 11 corresponding to the three-winged drag bit 21, and the plurality of water eyes 11 are in communication with the drilling fluid flow channel. In this embodiment, at least two water eyes 11 are arranged on the end surface of the drill bit body 1 between every two adjacent three-winged drag bits 21, and the arrangement of the water eyes 11 and the drilling fluid flow channel can cool the drill bit, prevent the drill bit from being damaged due to heat generated by friction, and prolong the service life of the drill bit; on the other hand, the cuttings generated during the drilling process can be carried out of the borehole, avoiding the accumulation of cuttings to affect the drilling efficiency and quality.

[0031] In the above embodiment, preferably, the first reaming and gage-keeping part 3 includes a plurality of first gage-keeping ribs 31 uniformly arranged on the outer circumferential surface of the drill bit body 1; and the cutting surface of each first gage-keeping rib 31 is provided with a first alloy reaming blade 32 at the outer edge thereof close to the cutting part 2. In this embodiment, the first gage-keeping rib 31 includes a semi-elliptical gage-keeping plate, a plurality of semi-elliptical gage-keeping plates are uniformly arranged in a ring on the outer circumferential surface of the drill bit body 1, one side of each semi-elliptical gage-keeping plate forms a cutting surface, and the cutting surface is provided with a first alloy reaming blade 32 at the outer edge thereof close to the cutting part 2; the other side is fixedly installed with a stiffened rib plate, and the number of the stiffened rib plates is at least two, the bottom ends of the two stiffened rib plates are fixedly installed on the drill bit body 1, and the side surfaces are fixedly installed on the back surfaces (the side away from the cutting surface) of the semi-elliptical gage-keeping plates.

[0032] In the above embodiments, preferably, the secondary reaming and gauge-maintaining section 4 includes an annular fixing section 41 and a plurality of second gauge-maintaining ribs 42. The annular fixing section 41 is sleeved on the drill bit body 1 and fixedly connected to the drill bit body 1. The plurality of second gauge-maintaining ribs 42 are evenly arranged around the outer circumference of the annular fixing section 41. The cutting surfaces of the plurality of second gauge-maintaining ribs 42 are provided with second alloy reaming inserts 43 on the outer edge of the side near the cutting section 2. In this embodiment, the second gauge-maintaining rib 31 includes a semi-elliptical gauge-maintaining plate. The plurality of semi-elliptical gauge-maintaining plates are evenly arranged around the outer circumference of the annular fixing section 41. One side of each semi-elliptical gauge-maintaining plate forms a cutting surface. The cutting surface is provided with a first alloy reaming insert 32 on the outer edge of the side near the cutting section 2. A reinforcing rib is fixedly installed on the other side. The number of reinforcing ribs is at least two. The bottom ends of the two reinforcing ribs are fixedly installed on the annular fixing section 41, and the sides are fixedly installed on the back side (away from the cutting surface) of the semi-elliptical gauge-maintaining plate.

[0033] In the above embodiments, preferably, the number of first gauge-maintaining ribs 31 and second gauge-maintaining ribs 42 is not less than four. In this embodiment, a sufficient number of gauge-maintaining ribs can more evenly distribute the force on the drill bit during drilling, further improve the stability of the drill bit during drilling, better ensure the reaming accuracy and hole wall quality, and enable the drill bit to work stably even under complex geological conditions.

[0034] According to the present invention, a drilling tool is provided, which includes the above-mentioned large-diameter rapid drilling bit. Example 1

[0035] Construction objective: To complete a borehole with a diameter of 311mm.

[0036] In this embodiment, the outer diameter of the cutting part 2 is 152 mm, the outer diameter of the first-stage reaming and diameter-preserving part 3 is 216 mm, and the outer diameter of the second-stage reaming and diameter-preserving part 4 is 311 mm.

[0037] The specific construction method is as follows:

[0038] 1) Start the drilling equipment and slowly bring the drill bit into contact with the drilling face to begin drilling. The cutting part 2 of the drill bit will play its role first, using the three-wing scraper 21 and the alloy cutting blades 22 on the side of its cutting face to cut and break the rock on the working face, forming an initial 152mm borehole.

[0039] 2) As the drill bit continues to rotate and drill, the first alloy reaming cutter 32 on the multiple first gauge-maintaining ribs 31 of the first-stage reaming and gauge-maintaining section 3 begins to work, gradually enlarging the borehole diameter based on the initial drilling of the cutting section 2. At the same time, the first gauge-maintaining ribs 31 ensure the stability of the drill bit and the accuracy of the drilling direction during the drilling process.

[0040] 3) When the drilling reaches the working range of 216mm of the first reaming and gage-keeping part 3, the second alloy reamer 43 on the multiple second gage-keeping ribs 42 of the second reaming and gage-keeping part 4 further reams, and under the support of the annular fixing part 41, the hole diameter is enlarged to the target hole diameter, i.e. 311mm. In the whole reaming process, the second reaming and gage-keeping part 4 continuously maintains the stability and precision of the drilling;

[0041] 4) In the drilling process, drilling fluid is continuously injected into the drilling through the drilling fluid flow channel in the drill bit body 1 and the water eye 11 at the end. The drilling fluid cools the drill bit on the one hand, preventing the drill bit from being damaged due to high temperature; on the other hand, it carries the cuttings generated in the drilling process, so that it is discharged out of the drilling along the annular space between the drilling hole wall and the drill pipe.

[0042] The preferred embodiments of the present application have been described above, but are not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A large-diameter fast-hole-drill bit comprising a bit body (1), characterized in that, One end of the drill bit body (1) is provided with a cutting part (2), and the other end is provided with a connecting part (5); A first reaming and diameter maintaining part (3) and a second reaming and diameter maintaining part (4) are sequentially arranged between the cutting part (2) and the connecting part (5), the outer diameter of the first reaming and diameter maintaining part (3) is greater than the outer diameter of the cutting part (2) and less than the outer diameter of the second reaming and diameter maintaining part (4), and the outer diameter of the second reaming and diameter maintaining part (4) is consistent with the target hole diameter; The cutting part (2) is a three-winged doctor blade (21), the three-winged doctor blade (21) is fixedly installed at the end of the drill bit body (1), and the side of the cutting surface of the three-winged doctor blade (21) is provided with an alloy cutting blade (22); The first reaming and diameter maintaining part (3) comprises a plurality of first diameter maintaining ribs (31), and the plurality of first diameter maintaining ribs (31) are uniformly arranged on the outer circumferential surface of the drill bit body (1); The cutting surface of the plurality of first diameter maintaining ribs (31) is provided with a first alloy reaming blade (32) on the outer side of the side close to the cutting part (2); The second reaming and diameter maintaining part (4) comprises a ring-shaped fixed part (41) and a plurality of second diameter maintaining ribs (42), the ring-shaped fixed part (41) is sleeved on the drill bit body (1) and is fixedly connected with the drill bit body (1); The plurality of second diameter maintaining ribs (42) are uniformly arranged on the outer circumferential surface of the ring-shaped fixed part (41); and the cutting surface of the plurality of second diameter maintaining ribs (42) is provided with a second alloy reaming blade (43) on the outer side of the side close to the cutting part (2).

2. The large-diameter, fast-hole-entry drill bit of claim 1, wherein, A drilling fluid flow channel is arranged in the drill bit body (1) along the axial direction thereof; a plurality of water eyes (11) are arranged at the end of the drill bit body (1) corresponding to the three-winged doctor blade (21), and the plurality of water eyes (11) are in communication with the drilling fluid flow channel.

3. The large-diameter, fast-hole-entry drill bit of claim 1, wherein, The number of the first diameter maintaining ribs (31) and the second diameter maintaining ribs (42) is not less than 4.

4. A drill, characterized in that The large-diameter rapid hole-forming drill bit comprises the large-diameter rapid hole-forming drill bit.

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