Kelly bar rotary drilling bit for small-bore hard rock

Abstract

The utility model belongs to the technical field of rotary excavating drilling tools, and particularly discloses a kelly bar rotary excavating drill bit for small-bore hard rock, which comprises a disc-shaped bottom plate, a plurality of rotary excavating hobs are arranged at the bottom of the bottom plate at intervals, a sleeve square flange is arranged in the center of the top of the bottom plate, and the bottom plate is in transmission connection with a drill rod extending into the sleeve square flange. A plurality of arc-shaped enclosures fixedly connected with the top of the bottom plate are arranged on the periphery of the sleeve square flange at intervals, the area between the enclosures and the sleeve square flange is a slag storage position used for storing slag, a slag inlet used for feeding slag is formed between every two adjacent enclosures, one end of each slag inlet is communicated with the slag storage position, and the other end of each slag inlet is communicated with the outside. Disintegrating slag generated in the rotary excavating process can enter the slag storage position through the slag inlet to be temporarily stored, the sleeve square flange is matched with the rotary excavating drill rod and can be used by being matched with a common rotary excavating drill rod, a traditional rotary excavating drill bit can be replaced, slag storage and slag extraction are conducted, the drill bit adapts to harder rock stratums, the overall structure is firm and durable, and the service life is longer.

Description

TECHNICAL FIELD

[0001] The utility model belongs to rotary drilling rig technical field, specifically discloses a square drill pipe rotary drilling head for small aperture hard rock. BACKGROUND

[0002] With the development of society, rotary drilling rig has developed towards large and giant, in recent years, the domestic technology matures and perfects, the domestic independently developed large rotary drilling rig, satisfies the demand of market. Rotary drilling rig is widely used in building foundation engineering's hole forming operation because of its own construction speed, environmental pollution, mechanization, high automation degree, flexible operation, high safety performance, strong applicability, especially high-rise building and railway, bridge construction operation.

[0003] For hard rock, hard stone, many strata, in the step of rotary drilling, it is easy to appear that rotary drilling rig does not drill, the problem of too large required torque, at present, it will adopt grading rotary drilling, namely, using the drill bit of continuously expanding diameter drills in turn, but this way needs and installs multiple specifications of drill bit, causes the construction process to be complicated, needs to develop a kind of drill bit that can adapt to hard rock stratum. SUMMARY

[0004] In order to solve the problems in the background art, the utility model discloses a square drill pipe rotary drilling head for small aperture hard rock, which combines the structure of traditional vertical shaft drill bit and rotary drilling bit, realizes slag storage and slag lifting, improves the punching efficiency, adapts to harder rock layers, and has a reliable and durable overall structure and a longer service life.

[0005] To achieve the above-mentioned purposes, the utility model adopts the following technical solutions:

[0006] A square drill pipe rotary drilling head for small aperture hard rock, comprising a disc-shaped bottom plate, a plurality of rotary drilling cutters are arranged at intervals on the bottom of the bottom plate, a sleeve method is arranged at the center of the top of the bottom plate, the bottom plate is drivingly connected with a drill rod extending into the sleeve method, a plurality of arc-shaped enclosures fixedly connected with the top of the bottom plate are arranged at intervals on the periphery of the sleeve method, the area between the enclosures and the sleeve method is a slag storage position for storing slag, a slag inlet for feeding slag is arranged between adjacent enclosures, one end of the slag inlet communicates with the slag storage position, and the other end of the slag inlet communicates with the outside, and the broken slag generated during rotary drilling can enter the slag storage position for temporary storage through the slag inlet.

[0007] Further, the square drill pipe rotary drilling head for small aperture hard rock is provided with a torque transmission box corresponding to the space between the enclosures and the sleeve method, and the torque transmission box divides the slag storage position into a plurality of slag storage areas, and each slag storage area is provided with a slag inlet.

[0008] Further, the small aperture hard rock with kelly bushing rotary drill bit, the residue inlet extends along the radial direction of the sleeve method or extends along the tangential direction of the surrounding ring.

[0009] Further, the small aperture hard rock with kelly bushing rotary drill bit, the residue inlet extends along the radial direction of the sleeve method or extends along the tangential direction of the surrounding ring.

[0010] Further, the small aperture hard rock with kelly bushing rotary drill bit, the residue inlet extends along the radial direction of the sleeve method or extends along the tangential direction of the surrounding ring.

[0011] Further, the small aperture hard rock with kelly bushing rotary drill bit, the residue inlet extends along the radial direction of the sleeve method or extends along the tangential direction of the surrounding ring.

[0012] Further, the small aperture hard rock with kelly bushing rotary drill bit, the residue inlet extends along the radial direction of the sleeve method or extends along the tangential direction of the surrounding ring.

[0013] Compared with the prior art, the small aperture hard rock with kelly bushing rotary drill bit has the beneficial effects that:

[0014] The small aperture hard rock with kelly bushing rotary drill bit comprises a plurality of rotary cutters which are arranged at intervals on the bottom of the base plate, a sleeve bushing which is arranged at the center of the top of the base plate, and a drill rod which is in transmission connection with the base plate and extends into the sleeve bushing, a plurality of arc-shaped surrounding rings which are arranged at intervals on the periphery of the sleeve bushing and are fixedly connected with the top of the base plate, and a residue storage position which is arranged between the surrounding ring and the sleeve bushing, wherein a residue inlet is arranged between adjacent surrounding rings, one end of the residue inlet is in communication with the residue storage position, and the other end of the residue inlet is in communication with the outside, and the residue generated in the rotary digging process can enter the residue storage position through the residue inlet for temporary storage. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a sectional view of the small aperture hard rock with kelly bushing rotary drill bit of the utility model;

[0016] Fig. 2 is a sectional view of the small aperture hard rock with kelly bushing rotary drill bit of the utility model;

[0017] Fig. 3 is a sectional view of the small aperture hard rock with kelly bushing rotary drill bit of the utility model;

[0018] In the above figure: 1-base plate; 2-sleeve flange; 3-torque box; 4-circuit; 5-spiral wear strip; 6-side hob; 7-front hob; 8-slag inlet; 9-slag storage area. DETAILED DESCRIPTION

[0019] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0020] Combined with attachment Figs. 1-3 The utility model is described in detail. A square drill bit for rotary drilling of hard rock with a small aperture comprises a disc-shaped bottom plate 1. A plurality of rotary drilling cutters are arranged at intervals on the bottom of the bottom plate 1. A sleeve flange 2 is arranged at the center of the top of the bottom plate 1. The bottom plate 1 is connected to the drill rod inserted into the sleeve flange 2 for transmission. The sleeve flange 2 is key-connected to the drill rod. A plurality of arc-shaped circles 4 fixedly connected to the top of the bottom plate 1 are arranged at intervals on the periphery of the sleeve flange 2. The multi-section circles 4 need to be rolled. Ribs are welded on both sides of the multi-section circles 4 for support. The area between the circles 4 and the sleeve flange 2 is a slag storage position for slag storage. A slag inlet 8 for feeding slag is provided between adjacent circles 4, one end of the slag inlet 8 is connected to the slag storage position, and the other end of the slag inlet 8 is connected to the outside world. The crushed slag generated during the rotary drilling process can enter the slag storage position for temporary storage through the slag inlet 8. The utility model discloses a small-aperture hard rock square drill bit, a sleeve flange 2 is matched with the rotary drilling rod, and can be used with an ordinary rotary drilling rod. The scraper is replaced by a roller, which is suitable for harder rock formations. The overall structure is firm and durable, and has a longer service life. It can replace the traditional rotary drilling bit for slag storage and slag extraction, and is suitable for drilling projects using rotary drilling rigs with a diameter of about φ1.65m.

[0021] As an optional design, the square drill bit for small-aperture hard rock is preferably provided with a torque transmission box 3 between the ring 4 and the sleeve flange 2, and a lifting lug is welded on the upper side of the torque transmission box 3 to facilitate the slag lifting of the square drill bit for small-aperture hard rock of the utility model. The torque transmission box 3 divides the slag storage position into several slag storage areas 9, and each slag storage area 9 is respectively provided with a slag inlet 8. The crushed slag generated during the rotary drilling process can enter the slag storage position through the slag inlet 8 for temporary storage, thereby realizing slag storage.

[0022] As an optional design, the small-diameter hard rock square drill bit is preferably used, and the slag inlet 8 extends radially along the sleeve flange 2 or along the tangent direction of the ring 4 to ensure that the slag generated during the rotary drilling process can smoothly pass through the slag inlet 8 and enter the slag storage position for temporary storage.

[0023] As an optional design, the small-diameter hard rock square drill bit is preferably provided with a plurality of spiral wear-resistant strips 5 arranged at axial intervals along the sleeve flange 2 on the outer circular surface of the ring 4, and the spiral wear-resistant strips 5 are arranged in an intermittent bevel structure.

[0024] As an optional design, the small-aperture hard rock square drill bit is preferably used, and the outer edge surface of the spiral wear-resistant strip 5 protrudes from the outer edge surface of the base plate 1 to ensure that the slag generated during the rotary drilling process can smoothly pass through the slag inlet 8 into the slag storage position for temporary storage.

[0025] As an optional design, the small-diameter hard rock kelly rotary drilling drill bit is preferably provided with a diversion hole connected to the adjacent slag storage area 9 on the torque transmission box 3 to achieve uniform slag storage in the slag storage area 9.

[0026] As an optional design, the small-diameter hard rock square drill bit is preferably used, and the cutter includes a plurality of side cutters 6 spaced apart below the edge of the base plate and a plurality of positive cutters 7 spaced apart below the middle of the base plate. The side cutters 6 and positive cutters 7 are rotatably connected to the cutter seats disposed below the base plate, respectively. The scraper is replaced by the cutter, which is suitable for harder rock formations. The overall structure is sturdy and durable, and has a longer service life.

[0027] The working process of this utility model is as follows:

[0028] First, independently manufacture the welding base plate 1, sleeve flange 2, four-piece torque transmission box 3, multi-section ring 4, spiral wear-resistant strip 5, etc.; the sleeve flange 2 is rough-processed after welding; the multi-section ring 4 needs to be rolled into a circle. After completion, the above are welded together, and at the same time, the positioning welding hob seat is arranged with multiple side hobs 6 and positive hobs 7. The sleeve flange 2 is matched with the rotary drilling rod and can be used with ordinary rotary drilling rod. It can replace the traditional rotary drilling drill bit for slag storage and slag extraction, adapt to harder rock formations, and the overall structure is reliable and durable, with a longer service life.

[0029] The above description is only an application implementation method of the present utility model, but the protection scope of the present utility model is not limited to this, and the scope of rights of the present utility model cannot be limited by this. Any equivalent changes made according to the technical solution of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A small-diameter hard rock kelly rotary drill bit, characterized by: It includes a disc-shaped base plate, a plurality of rotary drilling cutters are arranged at intervals on the bottom of the base plate, a sleeve flange is arranged in the center of the top of the base plate, the base plate is connected to the drill rod inserted into the sleeve flange, and a plurality of arc-shaped circles fixedly connected to the top of the base plate are arranged at intervals on the periphery of the sleeve flange. The area between the circle and the sleeve flange is a slag storage position for storing slag, and a slag inlet for feeding slag is provided between adjacent circles, one end of the slag inlet is connected to the slag storage position, and the other end of the slag inlet is connected to the outside world. The crushed slag generated during the rotary drilling process can enter the slag storage position through the slag inlet for temporary storage.

2. The small-diameter hard rock kelly rotary drill bit according to claim 1 is characterized in that: A torque transmission box is correspondingly provided between the ring and the sleeve flange, and the torque transmission box divides the slag storage position into several slag storage areas, and each slag storage area is correspondingly provided with a slag inlet.

3. The small-diameter hard rock kelly rotary drill bit according to claim 1 or 2, characterized in that: The slag inlet extends along the radial direction of the sleeve flange or along the tangent direction of the ring.

4. The small-diameter hard rock kelly rotary drill bit according to claim 3, characterized in that: A plurality of spiral wear-resistant strips are arranged on the outer circumferential surface of the ring at intervals along the axial direction of the sleeve flange.

5. The small-diameter hard rock kelly rotary drill bit according to claim 3, characterized in that: The outer edge surface of the spiral wear-resistant strip protrudes from the outer edge surface of the bottom plate.

6. The small-diameter hard rock kelly rotary drill bit according to claim 3, characterized in that: A guide hole communicating with adjacent slag storage areas is provided on the torque transmission box.

7. The small-diameter hard rock kelly rotary drill bit according to claim 3, characterized in that: The rollers include a plurality of side rollers spaced below the edge of the bottom plate and a plurality of main rollers spaced below the middle of the bottom plate. The side rollers and main rollers are rotatably connected to roller seats disposed below the bottom plate respectively.

Images