Step-by-step reaming rotary drilling bit

Abstract

The utility model provides a step-by-step reaming rotary excavating drill bit, and belongs to the technical field of pile foundation construction equipment. Comprising a first drill cylinder, a second drill cylinder and a third drill cylinder which are coaxially fixed together from bottom to top, the diameter of the second drill cylinder is larger than that of the first drill cylinder, and the diameter of the third drill cylinder is larger than that of the second drill cylinder; a top plate is welded to the top end of the third drilling barrel. A square head is welded to the upper surface of the top plate. A plurality of guide strips are uniformly welded on the outer walls of the first drilling barrel, the second drilling barrel and the third drilling barrel; and a plurality of rotary excavating cones are uniformly welded at the bottom ends of the second drilling barrel and the third drilling barrel. The reamer has the advantages of high reaming efficiency, hole cleaning function and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of pile foundation construction equipment and relates to a step-by-step hole enlarging rotary drilling drill bit. Background Art

[0002] Rotary drilling is a construction process suitable for drilling holes in building foundations. It is widely used in municipal construction, highway bridges, high-rise buildings, and other foundation construction projects. Combined with various drilling tools, it is suitable for drilling holes in dry (short spiral) or wet (rotary bucket) and rock formations (core drilling). In pile foundation construction, drilling operations are sometimes required in hard rock geology. Under these geological conditions, drilling operations are subject to significant drill bit wear, high costs, and long construction times. Therefore, when drilling large holes in these conditions, a small-diameter drill bit is often used for rotary drilling. Then, larger-diameter drill bits are gradually replaced and the hole is expanded multiple times to meet the construction diameter. This method is inefficient, prolongs the construction period, and fails to reduce the cost of pile foundation construction. Utility Model Content

[0003] The purpose of this utility model is to provide a step-by-step hole enlarging rotary drilling drill bit to address the above-mentioned problems existing in the existing technology, so that it can complete multiple-stage hole enlarging operations at one time without replacing the drill bit, thereby improving the hole enlarging efficiency and shortening the construction period.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a step-by-step hole-reaming rotary drilling drill bit, characterized in that the rotary drilling drill bit includes a first drill barrel, a second drill barrel and a third drill barrel that are coaxially fixed together from bottom to top, and the diameter of the second drill barrel is larger than the diameter of the first drill barrel, and the diameter of the third drill barrel is larger than the diameter of the second drill barrel; a top plate is welded to the top end of the third drill barrel, and a square head is welded to the upper surface of the top plate; a plurality of guide bars are evenly welded on the outer walls of the first drill barrel, the second drill barrel and the third drill barrel; a plurality of rotary drilling cutters are evenly welded to the bottom ends of the second drill barrel and the third drill barrel.

[0005] Preferably, the top ends of the first drill barrel and the second drill barrel are respectively welded with a first annular plate and a second annular plate extending outward, and the outer peripheral surface of the first annular plate is welded to the middle and lower part of the inner wall of the second drill barrel, and the outer peripheral surface of the first annular plate is welded to the middle and lower part of the inner wall of the third drill barrel; the tops of the first drill barrel and the second drill barrel are both provided with notches, and guide plates are welded obliquely at the notches, and guide plates are welded obliquely at each notch, and the bottom of each guide plate is higher than the bottom end of the gear; the bottom end of the first drill barrel is provided with an openable and closable bottom plate.

[0006] The utility model has the advantages:

[0007] 1. This rotary drilling bit can complete multi-stage hole expansion at one time without changing the drill bit specifications, thereby improving the hole expansion efficiency and shortening the construction period of pile foundation.

[0008] 2. This rotary drilling bit can complete the hole cleaning operation while expanding the hole, so that the efficiency of the hole expansion operation is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a front structural schematic diagram of the rotary drilling drill bit.

[0010] Figure 2 It is a schematic diagram of the three-dimensional structure of the rotary drilling drill bit.

[0011] Figure 3 It is a schematic diagram of the internal structure of the rotary drilling drill bit.

[0012] In the figure, 1, first drill tube; 11, bottom plate; 2, second drill tube; 3, third drill tube; 31, top plate; 32, square head; 4, guide bar; 5, rotary cutting wheel; 6, first annular plate; 7, second annular plate; 8, notch; 9, guide plate. DETAILED DESCRIPTION

[0013] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0014] like Figure 1 、 Figure 2 and Figure 3 As shown, a step-by-step hole-reaming rotary drilling drill bit includes a first drill barrel 1, a second drill barrel 2, and a third drill barrel 3 coaxially fixed together from bottom to top, wherein the diameter of the second drill barrel 2 is larger than the diameter of the first drill barrel 1, and the diameter of the third drill barrel 3 is larger than the diameter of the second drill barrel 2; a top plate 31 is welded to the top end of the third drill barrel 3, and a square head 32 is welded to the upper surface of the top plate 31; a plurality of guide bars 4 are uniformly welded to the outer walls of the first drill barrel 1, the second drill barrel 2, and the third drill barrel 3; a plurality of rotary drilling cutters 5 are uniformly welded to the bottom ends of the second drill barrel 2 and the third drill barrel 3.

[0015] When this rotary drilling drill bit is used for hole expansion, its first drill barrel 1 is always located in the pre-opened pile foundation hole, thereby playing a centering role for the entire hole expansion operation, making the hole expansion operation less likely to deviate. The second drill barrel 2 and the third drill barrel 3 play the role of rotary drilling and expansion, and a number of rotary drilling rollers 5 are distributed at their lower ends to crush the hard rock. In addition, the diameters of the second drill barrel 2 and the third drill barrel 3 gradually increase, so as the drill bit continues to drill, the hard rock around the pre-opened pile foundation hole is layered and crushed, drilling step by step to achieve large-diameter rock expansion operations. This rotary drilling drill bit can complete multi-stage (two-stage) hole expansion at one time without changing the drill bit specifications, thereby improving hole expansion efficiency and shortening the construction period of pile foundation construction.

[0016] like Figure 1 、 Figure 2 and Figure 3 As shown, the tops of the first drill barrel 1 and the second drill barrel 2 are respectively welded with a first annular plate 6 and a second annular plate 7 extending outward, and the outer circumference of the first annular plate 6 is welded to the middle and lower part of the inner wall of the second drill barrel 2, and the outer circumference of the first annular plate 6 is welded to the middle and lower part of the inner wall of the third drill barrel 3; the tops of the first drill barrel 1 and the second drill barrel 2 are both provided with a notch 8, and each notch 8 is welded with a guide plate 9 at an angle, and the bottom of each guide plate 9 is higher than the bottom end of the rotary cutting wheel 5; the bottom end of the first drill barrel 1 is provided with an openable and closable bottom plate 11.

[0017] As the hole enlarging operation continues, the hard rock is broken by the continuous cutting of the rotary cutting wheel 5, and a large amount of debris is formed around the drill bit. The existing practice is generally to enlarge the hole first, and then use a sand bucket to clean the hole. This method prolongs the construction period and increases the cost of pile foundation construction. However, when the rotary drilling bit is in the rotary drilling operation, each guide plate 9 tilts and shovels the debris as the drill bit rotates, causing it to continuously accumulate at the guide plate 9 and eventually fall into the drill bit through the notch 8. In this drill bit, the bottom of the first drill barrel 1 is provided with an openable and closable bottom plate 11. After it is closed, the debris can be stored in the first drill barrel 1. After it is full, the drill bit is pulled out, the bottom plate 11 is opened (the opening and closing mechanism of the bottom plate 11 is well described in the prior art and will not be repeated here), and the debris can be dumped out. In this way, the drill bit can have the functions of both enlarging and cleaning the hole, so that the efficiency of its enlarging operation is further improved.

[0018] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A step-by-step hole enlarging rotary drilling drill bit, characterized in that: The rotary drilling bit comprises a first drill barrel (1), a second drill barrel (2) and a third drill barrel (3) which are coaxially fixed together from bottom to top, wherein the diameter of the second drill barrel (2) is larger than that of the first drill barrel (1), and the diameter of the third drill barrel (3) is larger than that of the second drill barrel (2); a top plate (31) is welded to the top end of the third drill barrel (3), and a square head (32) is welded to the upper surface of the top plate (31); a plurality of guide bars (4) are uniformly welded to the outer walls of the first drill barrel (1), the second drill barrel (2) and the third drill barrel (3); and a plurality of rotary drilling rollers (5) are uniformly welded to the bottom ends of the second drill barrel (2) and the third drill barrel (3).

2. The step-by-step hole enlarging rotary drilling drill bit according to claim 1, characterized in that: The top ends of the first drill tube (1) and the second drill tube (2) are respectively welded with a first annular plate (6) and a second annular plate (7) extending outward, and the outer peripheral surface of the first annular plate (6) is welded to the middle and lower part of the inner wall of the second drill tube (2), and the outer peripheral surface of the first annular plate (6) is welded to the middle and lower part of the inner wall of the third drill tube (3); the top ends of the first drill tube (1) and the second drill tube (2) are both provided with a notch (8), and a guide plate (9) is welded obliquely at the notch (8), and a guide plate (9) is welded obliquely at each notch (8), and the bottom of each guide plate (9) is higher than the bottom end of the gear; the bottom end of the first drill tube (1) is provided with an openable bottom plate (9).

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