CN213743259U

CN213743259U - Rotary drill bit of rotary drilling machine

Info

Publication number: CN213743259U
Application number: CN202022940283.1U
Authority: CN
Inventors: 郑超祎; 宋银华; 叶江健; 陈葵; 项大兴; 何伟斌; 余巍巍; 万绍平
Original assignee: GUOQIANG CONSTRUCTION GROUP CO Ltd
Current assignee: GUOQIANG CONSTRUCTION GROUP CO Ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-07-20
Anticipated expiration: 2030-12-10

Abstract

The utility model belongs to the technical field of mechanical equipment, concretely relates to drill bit that circles round of rig. It has solved the problem that current rotary drill bit life is low. The rotary drill bit of the rotary drilling machine comprises a hollow rotating shaft, wherein a conical drill bit assembly with a large upper part and a small lower part is arranged on the hollow rotating shaft. The utility model discloses a promote the life of rotary drill bit.

Description

Rotary drill bit of rotary drilling machine

Technical Field

The utility model belongs to the technical field of mechanical equipment, concretely relates to drill bit that circles round of rig.

Background

At present underground structure building is more and more, and in pile foundation work progress, major diameter overlength stake often meets the relatively poor gravel layer geology of drillability, and ordinary positive circulation three wing alloy drill bit is when boring the gravel, and the progress is slow on the one hand, and the hard gravel of on the other hand can produce very big impact force to the drill bit, leads to drill bit wearing and tearing serious, and operating personnel need change the drill bit in order to prevent that the drill bit from damaging to influence pile foundation construction speed and quality.

In order to solve the problem, the chinese patent (application No. CN203867466U) proposes a trapezoidal drill bit for a forward circulation rotary drilling machine for gravel layer geology, which comprises a hole guiding portion arranged at the front end of a middle shaft, wherein the hole guiding portion comprises four plates, and a cutting tool bit is arranged on the bottom edge of each plate, so that impact on the drill bit can be reduced by the opposite cutting tool bit, but the plates on the hole guiding portion can bear large cutting stress in the drilling process, so that the hole guiding portion is easily damaged, and the hole guiding portion needs to be replaced, thereby affecting the construction speed and quality of a pile foundation.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a drill bit that circles round of rig, the utility model aims to solve the technical problem that: how to improve the service life of a rotary drill bit of a rotary drilling machine.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a drill bit that circles round of rig, includes hollow rotating shaft, is equipped with big-end-up's toper drill bit subassembly in the hollow rotating shaft, its characterized in that, the drill bit that circles round still includes a plurality of guide hole post that the bottom of hollow rotating shaft set up along its axial, and a plurality of guide hole post sets up along the circumference interval of pivot, the bottom surface of guide hole post is located the below of hollow rotating shaft bottom surface, the bottom surface of guide hole post is equipped with a plurality of cutting tool bit one.

When the gravel layer was under construction, the cutting tool bit on the leading hole post through hollow rotating shaft bottom was firstly carried out the drilling to the gravel, then the rethread taper drill subassembly further cut native reaming, compares four plates that the leading hole portion in the background art adopted, and this leading hole post resistance is little in the drilling, produced cutting stress when can effectively handling the drilling, promotes the life of rotary drill bit.

In the rotary drill of the rotary drilling machine, the pilot hole column is in a step shaft shape, and the shaft diameter of the lower end of the pilot hole column is larger than that of the upper end of the pilot hole column. The leading hole post is the step axle form, and the lower extreme diameter of axle is greater than the structural strength that the upper end diameter of axle can effectively promote the leading hole post, realizes the life of the drill bit that circles round to the area of operation when can promote the drilling of leading hole post.

In the rotary drill of the rotary drilling machine, a plurality of second cutting bits are arranged on the outer side wall of the hole guiding column at intervals along the circumferential direction of the hole guiding column. And the second cutting tool bit can improve the size of the lead hole column.

In the rotary drill bit of the rotary drilling machine, the bottom end of the first cutting tool bit is in a circular table shape with a small lower part and a large upper part. The bottom end of the first cutting tool bit is in a round table shape with a small bottom and a large top, and reliable structural strength can be provided during drilling.

In the rotary drill of the rotary drilling machine, the hole guiding column is connected with the outer side wall of the hollow rotating shaft. The guide hole column is connected to the outer side wall of the hollow rotating shaft, so that the guide hole column can be detached and replaced when the hollow rotating shaft is used in the later period.

In foretell rotary drill bit of rig that circles round, the toper drill bit subassembly includes the crown plate that sets up around hollow rotating shaft circumference, be equipped with between crown plate and the hollow rotating shaft and be connected both connecting plates, still be equipped with the cutter saddle strip that a plurality of set up around hollow rotating shaft interval between crown plate and the hollow rotating shaft, the top of every cutter saddle strip all links to each other with the crown plate, and the bottom of every cutter saddle strip all links to each other with hollow rotating shaft, is equipped with a plurality of cutting tool bit three along its length direction on every cutter saddle strip. The tool rest strip is connected with the hollow rotating shaft through the annular plate to form a conical drill bit assembly with a large upper part and a small lower part, the annular plate is connected with the hollow rotating shaft through the connecting plate, and the cutting tool bit III on the tool rest strip performs drilling.

In the rotary drill bit of the rotary drilling machine, a hole guiding column is arranged between every two tool rest strips, and the number of the tool rest strips is the same as that of the hole guiding columns. All set up a leading hole post between per two cutter frame strips and can guarantee that can effectually lead the hole to the conical bit subassembly when the drilling of leading hole post, promote conical bit subassembly's life.

In the rotary drill of the rotary drilling machine, the outer side wall of the ring plate is provided with a plurality of cutting bits four along the circumferential direction. When the hollow rotating shaft drives the ring plate to rotate, the cutting tool bit IV on the ring plate can cut gravel on the opposite side, and further hole expansion is carried out through the ring plate, so that abrasion of the ring plate is prevented.

Compared with the prior art, the rotary drill bit of the rotary drilling machine has the following advantages:

1. compare the plate setting of draw hole portion in the comparison file, the resistance that this draw hole post received when drilling is little, produced cutting stress when can effectively handling the drilling promotes the life of the drill bit that circles round

2. The cutter frame strip and the leading hole column are arranged at intervals, so that the leading hole of the conical drill bit assembly can be effectively led when the leading hole column is drilled, and the service life of the conical drill bit assembly is prolonged.

Drawings

Fig. 1 is a schematic perspective view of one of the viewing angles of the present invention.

Fig. 2 is a schematic perspective view of another perspective of the present invention.

Fig. 3 is a partially enlarged view of fig. 2.

In the figure, 1, a hollow rotating shaft; 2. a conical bit assembly; 2a, a ring plate; 2b, a connecting plate; 2c, a tool rest bar; 2d, a third cutting tool bit; 2e, a cutting tool bit IV; 3. a hole guiding column; 4. a first cutting tool bit; 5. and a second cutting tool bit.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the rotary drill of the rotary drilling machine comprises a hollow rotating shaft 1, a tapered drill component 2 with a large top and a small bottom is arranged on the hollow rotating shaft 1, the drill component comprises a ring plate 2a arranged around the circumference of the hollow rotating shaft 1, a connecting plate 2b for connecting the ring plate 2a and the hollow rotating shaft 1 is arranged between the ring plate 2a and the hollow rotating shaft 1, a plurality of cutter frame strips 2c arranged around the hollow rotating shaft 1 at intervals are further arranged between the ring plate 2a and the hollow rotating shaft 1, the top end of each cutter frame strip 2c is connected with the ring plate 2a, the bottom end of each cutter frame strip 2c is connected with the hollow rotating shaft 1, a plurality of cutting bits three 2d are arranged on each cutter frame strip 2c along the length direction of the cutter frame strips, and a cutting edge facing the outside is arranged on each cutting bit three 2 d. The number of the above-mentioned tool rest strips 2c may be 4, 6 or 8, and is selected according to the actual use requirement, and the number of the cutting tool bits three 2d may be 8 or 10, and is selected according to the actual use requirement, in this embodiment, four tool rest strips 2c are preferably adopted, and each tool rest strip 2c is provided with 8 cutting tool bits three 2 d.

As shown in fig. 1 to 3, a tool holder strip 2c is connected with a hollow rotating shaft 1 through a ring plate 2a to form a tapered drill bit assembly 2 with a large top and a small bottom, the ring plate 2a is connected with the hollow rotating shaft 1 through a connecting plate 2b, and a cutting bit three 2d on the tool holder strip 2c is used for drilling. A plurality of cutting bits four 2e are arranged on the outer side wall of the annular plate 2a along the circumferential direction, and the cutting bits four 2e are provided with cutting edges facing outwards. The number of the cutting tips four 2e may be 10, 8 or 6, and the number is selected according to actual conditions, in this embodiment, 10 cutting tips four 2e are provided on the ring plate 2 a. When the hollow rotating shaft 1 drives the annular plate 2a to rotate, the cutting tool bit four 2e on the annular plate 2a can cut gravel on the opposite side, and the annular plate 2a is further reamed to prevent abrasion of the annular plate 2 a.

Specifically, as shown in fig. 1 to 3, a plurality of pilot hole columns 3 are arranged at the bottom end of a hollow rotating shaft 1, the pilot hole columns 3 are in a step shaft shape with the pilot hole columns 3 on the circumferential outer side wall of the hollow rotating shaft 1, the shaft diameter of the lower ends of the pilot hole columns 3 is larger than that of the upper ends of the pilot hole columns, the upper portions of the pilot hole columns 3 with smaller shaft diameters are connected with the hollow rotating shaft 1, the bottom surfaces of the pilot hole columns 3 are located below the bottom surface of the hollow rotating shaft 1, the larger shaft diameter of the lower ends of the pilot hole columns 3 can partially extend to the lower portion of the hollow rotating shaft 1, a plurality of cutting tips 4 are arranged on the bottom surface of the pilot hole columns 3, the top ends of the cutting tips 4 are in a cylindrical shape, and the bottom ends of the cutting tips 4 are in a circular truncated cone shape with a smaller bottom and a larger top. Can carry out the drilling with the gravel below hollow rotating shaft 1 when drilling is beaten, avoid causing the hindrance to hollow rotating shaft 1.

As shown in fig. 1 to 3, the hole guiding columns 3 are arranged at intervals along the circumferential direction of the rotating shaft, one hole guiding column 3 is arranged between every two tool rest strips 2c, the number of the tool rest strips 2c is the same as that of the hole guiding columns 3, in this embodiment, the number of the tool rest strips 2c is four, and the number of the hole guiding columns 3 is also four. All set up one between per two cutter saddle strips 2c and draw hole post 3 and can guarantee that can effectually draw the hole to conical bit subassembly 2 when the drilling of drawing hole post 3, promote conical bit subassembly 2's life.

Further, as shown in fig. 1 to 3, a plurality of second cutting bits 5 are arranged on the outer side wall of the end, with the larger axial diameter, of the guide hole column 3 at intervals along the circumferential direction of the outer side wall, the second cutting bits 5 are provided with outwardly facing cutting edges, the size of the guide hole column 3 can be increased due to the arrangement of the second cutting bits 5, gravel below the hollow rotating shaft 1 can be ground and cut by the second cutting bits 5, the downward obstruction of the gravel to the hollow rotating shaft 1 is further reduced, and some gravel below the hollow rotating shaft 1, which is not cut by the guide hole column 3, can enter the hollow rotating shaft 1. The number of the second cutting bits 5 can be 4 or 6, which is selected according to the actual equipment requirements.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a drill bit that circles round of rig, includes hollow rotating shaft (1), is equipped with big-end-up's toper drill bit subassembly (2) on hollow rotating shaft (1), its characterized in that, the drill bit that circles round still includes a plurality of guide post (3) that the bottom of hollow rotating shaft (1) set up along its axial, and a plurality of guide post (3) set up along the circumference interval of pivot, the bottom surface of guide post (3) is located the below of hollow rotating shaft (1) bottom surface, the bottom surface of guide post (3) is equipped with a plurality of cutting tool bit (4).

2. The rotary drill of rotary drilling machine according to claim 1, characterized in that the pilot hole pillar (3) is stepped shaft-shaped, the shaft diameter of the lower end of the pilot hole pillar (3) being larger than the shaft diameter of the upper end.

3. The rotary drill of rotary drilling machine according to claim 2, characterized in that the outer side wall of the pilot hole column (3) is provided with a plurality of second cutting bits (5) at intervals along the circumference thereof.

4. The rotary drill of a rotary drill according to claim 3, wherein the bottom end of the first cutting bit (4) is in the shape of a truncated cone with a small bottom and a large top.

5. The rotary drill bit of a rotary drill according to claim 1 or 2 or 3 or 4, characterized in that the pilot hole pillar (3) is connected to an outer side wall of the hollow rotary shaft (1).

6. The rotary drill bit of the rotary drilling machine according to claim 5, wherein the conical drill bit assembly (2) comprises a ring plate (2a) arranged circumferentially around the hollow rotating shaft (1), a connecting plate (2b) for connecting the ring plate (2a) and the hollow rotating shaft (1) is arranged between the ring plate (2a) and the hollow rotating shaft (1), a plurality of cutter holder strips (2c) arranged at intervals around the hollow rotating shaft (1) are further arranged between the ring plate (2a) and the hollow rotating shaft (1), the top end of each cutter holder strip (2c) is connected with the ring plate (2a), the bottom end of each cutter holder strip (2c) is connected with the hollow rotating shaft (1), and a plurality of three cutting heads (2d) are arranged on each cutter holder strip (2c) along the length direction thereof.

7. The rotary drill bit of a rotary drill according to claim 6, characterized in that between every two tool holder strips (2c) there is one hole guiding stud (3), said tool holder strips (2c) being the same number as the hole guiding studs (3).

8. The rotary drill of rotary drilling machine according to claim 7, characterized in that the outer side wall of the ring plate (2a) is provided with a plurality of cutting bits four (2e) along its circumference.