Split type guide reaming drill bit assembly

Abstract

The invention relates to the technical field of rock drilling tools, in particular to a split type guiding and chambering drill bit assembly which comprises a chambering guider and a chambering drill bit, an alloy drill piece is embedded in the front end of the chambering guider, and a water channel is formed in the chambering guider in the axial direction. The middle drainage hole can guide water from the water channel to the position near the front end face of the reaming drill bit, four end face drainage grooves are formed in the front end face of the reaming drill bit, and eight powder discharging grooves are formed in the outer side face of the reaming drill bit. The end face drainage grooves are formed in the front end face of the reaming drill bit, so that alloy teeth of the reaming drill bit can be uniformly cooled, and the service life of the alloy teeth is prolonged; powder discharging grooves perpendicular to the end face drainage grooves are formed in the circumferential face of the reaming drill bit, so that the slag discharging effect can be remarkably improved; by means of the novel design of the end drainage holes and the middle drainage holes, the cooling effect can be improved, slag can be discharged in time, the tail of the drill bit is not blocked, and the drill rod withdrawing process is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of rock drilling tools, and in particular to a split guide reaming drill bit assembly. Background Art

[0002] The statements in this section are merely intended to provide background information related to the technical solution of the present application to aid understanding, and they do not necessarily constitute prior art for the technical solution of the present application.

[0003] Split guide reaming drill bits are mainly used in engineering mining, road traffic, hydropower facilities and other infrastructure construction. In order to achieve a better blasting effect, it is necessary to increase the size of the rock drilling hole in the middle of a rock drilling surface, so a reaming drill bit is needed. As one of the main structures for rock drilling and blasting, the split guide reaming drill bit has high straightness and small offset during the rock drilling process, so it is widely used.

[0004] The split guide reaming drill bit is composed of a drill bit body and carbide teeth. Due to the high hardness of the carbide teeth, they are in direct contact with the rock during the rock crushing process, playing a crushing and impacting role. The drill bit body structure design must also meet the rock drilling requirements. The slag removal effect must be considered in the structural design of the head guide, the layout of the carbide teeth and the water holes. The unsmooth slag removal causes the drill bit to repeatedly impact the slag, etc., resulting in serious wear of the drill bit body, slow penetration, and low rock drilling efficiency, which leads to early wear and failure of the drill bit and leads to scrapping, greatly reducing the service life of the rock drilling drill bit. Since the service conditions of the rock drilling drill bit are very harsh and the stress conditions are very complex, it has the shortest service life among all drilling tools, so the requirements for its various performance and quality are very strict. The service life of each drill bit is usually only 80-150 meters.

[0005] The guide hole expansion rock drilling bit is a special drill bit. During use, a smaller guide hole is pre-drilled, and then the hole is expanded with the hole expansion bit to meet the blasting requirements. Therefore, the hole expansion bit product structure is designed according to the use form and rock drilling method. The specifications are from φ65-φ152, and the head guide type is designed according to the pre-opening size. Generally, the head guide diameter is designed to be 2-5mm smaller than the pre-opening diameter.

[0006] However, the existing technical solutions of guided ball-tooth reaming drill bits still have the following problems during use: the slag removal effect is not smooth, the penetration is relatively slow, the drill bit shell is severely worn, resulting in early failure and scrapping of the drill bit; the alloy teeth are unevenly cooled, and the alloy teeth are prone to early failure and scrapping; the slag is easy to clog, making it difficult to withdraw the drill bit, and it is easy to get stuck. Summary of the invention

[0007] The purpose of the present invention is to provide a split guide reaming drill bit assembly to solve the above problems. In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A split guide reaming drill bit assembly, comprising: a reaming guide and a reaming drill bit, wherein the reaming drill bit is sleeved outside the reaming guide, an alloy drill bit is inlaid and installed at the front end of the reaming guide, a water channel is axially arranged inside the reaming guide, two opposite end drainage holes are arranged at the front end of the reaming guide, and the water channel of the reaming guide is communicated with the two end drainage holes respectively, two opposite middle drainage holes are also arranged in the middle of the reaming guide, and the water channel of the reaming guide is communicated with the two middle drainage holes respectively, the two middle drainage holes can guide water from the water channel to the vicinity of the front end face of the reaming drill bit, the front end face of the reaming drill bit is provided with four end face drainage grooves, the outer side of the reaming drill bit is provided with eight powder drainage grooves, the four end face drainage grooves are communicated with four of the eight powder drainage grooves respectively, a plurality of first carbide teeth are inlaid and installed on the outer side of the front end face of the reaming drill bit, and a plurality of second carbide teeth are inlaid and installed on the inner side of the front end face of the reaming drill bit.

[0009] In one embodiment, the four end surface drainage grooves are arranged radially on the front end surface of the reaming drill bit at equal intervals.

[0010] In one embodiment, the eight powder discharge grooves are arranged at equal intervals on the outer side of the reaming drill bit.

[0011] In one embodiment, eight first cemented carbide teeth are embedded and installed on the outer side of the front end surface of the reaming drill bit.

[0012] In one embodiment, four second cemented carbide teeth are embedded and installed on the inner side of the front end surface of the reaming drill bit.

[0013] In one embodiment, the reaming drill bit is sleeved on the middle portion of the reaming guide.

[0014] In one embodiment, the middle portion of the reaming guide is in the shape of a truncated cone, and a semi-cone angle thereof is 6°.

[0015] In one embodiment, the end surface drainage groove is perpendicular to the powder drainage groove.

[0016] In one embodiment, the interior of the reaming guide has an internal thread.

[0017] The beneficial effects of the present invention are as follows: the present invention provides an end face drainage groove on the front end face of the reaming drill bit, so that the alloy teeth of the reaming drill bit can be evenly cooled, thereby increasing the service life of the alloy teeth; the present invention provides a powder discharge groove perpendicular to the end face drainage groove on the circumferential surface of the reaming drill bit, which can significantly improve the slag discharge effect; the novel end drainage hole and middle drainage hole design can improve the cooling effect, and the slag can be discharged in time without being blocked at the tail of the drill bit, thereby facilitating the drill withdrawal process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The embodiments of the present invention are further described below with reference to the accompanying drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of a split guide reaming drill bit assembly according to one embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of a hole enlarging drill bit according to an embodiment of the present invention;

[0021] Figure 3 It is a schematic structural diagram of a hole expansion guide according to an embodiment of the present invention.

[0022] The meanings of the accompanying drawings are as follows: 1-hole expansion guide; 2-hole expansion drill bit; 3-water channel; 4-end drainage hole; 5-middle drainage hole; 6-thread; 7-end surface drainage groove; 8-powder drainage groove; 9-alloy drill bit; 10-first carbide tooth; 11-second carbide tooth. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] In the present application, "front" or "front end" generally refers to the direction or end in which the split guide reaming drill bit assembly contacts the rock when working, and "rear" or "rear end" generally refers to the direction or end in which the split guide reaming drill bit assembly is away from the rock when working. The rear end of the split guide reaming drill bit assembly can be coupled with various types of rock drills or drilling rigs, such as hand-held rock drills, trolley-type rock drills, hydraulic rock drills, down-the-hole drills, etc.

[0025] Figure 1 The structure diagram of the split guide reaming drill bit assembly according to one embodiment of the present invention is shown in FIG. The split guide reaming drill bit assembly comprises a reaming guide 1 and a reaming drill bit 2, wherein the reaming drill bit 2 is sleeved outside the reaming guide 1. In one embodiment, the reaming drill bit 2 is sleeved in the middle of the reaming guide 1.

[0026] Figure 2 The schematic diagram of the structure of a reaming drill bit according to an embodiment of the present invention is shown. The front end face of the reaming drill bit 2 is provided with four end face drainage grooves 7, and the outer side of the reaming drill bit 2 is provided with eight powder drainage grooves 8, and the four end face drainage grooves 7 are respectively connected with four of the eight powder drainage grooves 8, and the outer side of the front end face of the reaming drill bit 2 is inlaid with a plurality of first carbide teeth 10, and the inner side of the front end face of the reaming drill bit 2 is inlaid with a plurality of second carbide teeth 11.

[0027] Figure 3 The schematic diagram of the structure of the reaming guide according to one embodiment of the present invention. The front end of the reaming guide 1 is inlaid with an alloy drill bit 9, the interior of the reaming guide 1 is provided with a water channel 3 along the axial direction, the front end of the reaming guide 1 is provided with two opposite end drainage holes 4, and the water channel 3 of the reaming guide 1 is connected with the two end drainage holes 4 respectively, and the middle part of the reaming guide 1 is also provided with two opposite middle drainage holes 5, and the water channel 3 of the reaming guide 1 is connected with the two middle drainage holes 5 respectively. The two middle drainage holes 5 can guide the water from the water channel 3 to the vicinity of the front end face of the reaming drill bit 2.

[0028] In one embodiment, the four end surface drainage grooves 7 can be arranged radially on the front end surface of the reaming drill bit 2 at equal intervals, that is, the four end surface drainage grooves 7 are arranged at four equal positions of the circular front end surface of the reaming drill bit 2.

[0029] In one embodiment, the eight powder discharge grooves 8 can be arranged at equal intervals on the outer side of the reaming drill bit 2, and the four powder discharge grooves separated from the eight powder discharge grooves 8 are respectively connected to the four end surface drainage grooves 7. In one embodiment, the end surface drainage groove 7 and the powder discharge groove 8 are perpendicular to each other.

[0030] In one embodiment, eight first carbide teeth 10 are embedded and installed on the outer side of the front end surface of the reaming drill bit 2, and four second carbide teeth 11 are embedded and installed on the inner side of the front end surface of the reaming drill bit 2.

[0031] In one embodiment, the middle portion of the reaming guide 1 is truncated cone-shaped, and its semi-cone angle is 6°. The reaming drill bit 2 is sleeved outside the truncated cone-shaped middle portion of the reaming guide 1. The cone angle refers to the angle between two generatrixes of the axial section (the section passing through the axis) of a cone or a truncated cone, and the semi-cone angle is half of the cone angle.

[0032] In one embodiment, the interior of the reaming guide 1 has an internal thread 6 .

[0033] References herein to "various embodiments," "some embodiments," "one embodiment," or "an embodiment," etc. refer to a particular feature, structure, or property described in conjunction with the embodiment being included in at least one embodiment. Thus, the appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," etc., throughout this document do not necessarily refer to the same embodiment. Furthermore, particular features, structures, or properties may be combined in any suitable manner in one or more embodiments. Thus, particular features, structures, or properties shown or described in conjunction with one embodiment may be combined in whole or in part with features, structures, or properties of one or more other embodiments without restriction, as long as the combination is not illogical or inoperable.

[0034] Having thus described several aspects of at least one embodiment of the present invention, it will be appreciated that various changes, modifications and improvements will readily occur to those skilled in the art. Such changes, modifications and improvements are intended to be within the spirit and scope of the present invention. Although the present invention has been described by way of some embodiments, the present invention is not limited to the embodiments described herein, and also includes various changes and variations made without departing from the scope of the present invention.

Claims

1. A split guide reaming drill bit assembly, characterized in that: include: A reaming guide (1) and a reaming drill bit (2), wherein the reaming drill bit (2) is sleeved outside the reaming guide (1), an alloy drill bit (9) is embedded and installed at the front end of the reaming guide (1), a water channel (3) is axially arranged inside the reaming guide (1), two opposite end drainage holes (4) are arranged at the front end of the reaming guide (1), and the water channel (3) of the reaming guide (1) is respectively connected to the two end drainage holes (4), and two opposite middle drainage holes (5) are also arranged in the middle of the reaming guide (1), and the water channel (3) of the reaming guide (1) is connected to the two middle drainage holes (5) are respectively connected, the two middle drainage holes (5) can guide the water from the waterway (3) to the vicinity of the front end face of the reaming drill bit (2), the front end face of the reaming drill bit (2) is provided with four end face drainage grooves (7), the outer side surface of the reaming drill bit (2) is provided with eight powder drainage grooves (8), the four end face drainage grooves (7) are respectively connected with four of the eight powder drainage grooves (8), the outer side of the front end face of the reaming drill bit (2) is inlaid with a plurality of first carbide teeth (10), and the inner side of the front end face of the reaming drill bit (2) is inlaid with a plurality of second carbide teeth (11).

2. A split guide reaming drill bit assembly according to claim 1, wherein: The four end surface drainage grooves (7) are arranged radially at equal intervals on the front end surface of the hole expansion drill bit (2).

3. A split guide reaming drill bit assembly according to claim 1, wherein: The eight powder discharge grooves (8) are arranged at equal intervals on the outer side surface of the hole-expanding drill bit (2).

4. A split guide reaming drill bit assembly according to claim 1, wherein: Eight first hard alloy teeth (10) are inlaid and installed on the outer side of the front end surface of the hole expansion drill bit (2).

5. A split guide reaming drill bit assembly according to claim 1, wherein: Four second cemented carbide teeth (11) are embedded and installed on the inner side of the front end surface of the hole expansion drill bit (2).

6. A split guide reaming drill bit assembly according to claim 1, wherein: The reaming drill bit (2) is sleeved on the middle part of the reaming guide (1).

7. A split guide reaming drill bit assembly according to claim 6, wherein: The middle part of the hole expansion guide (1) is in the shape of a truncated cone, and its semi-cone angle is 6°.

8. A split guide reaming drill bit assembly according to claim 1, wherein: The end surface drainage groove (7) is perpendicular to the powder drainage groove (8).

9. A split guide reaming drill bit assembly according to claim 1, wherein: The interior of the hole expansion guide (1) is provided with an internal thread (6).

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