A cylindrical inverted trapezoidal blade rotary drilling machine drill bit

Abstract

The utility model provides a rotary drilling machine drill bit with a cylindrical inverted trapezoidal blade, which can solve the problems of difficulty in soil clearing during the construction of the rotary drilling machine and easy breakage of the blade in a complex construction environment, thereby improving the drilling efficiency and saving construction costs. The rotary drilling machine drill bit comprises: an outer cylinder, a blade and a slag removal unit; the outer cylinder is a hollow structure with openings at both ends, a top cover is provided at the top opening, and a plurality of blades are evenly spaced along the circumferential direction on the bottom end surface; the blade is an inverted trapezoidal structure, that is, the side surface of the blade is fixed to the outer cylinder, the small end surface faces the inner side of the outer cylinder, and the large end surface faces the outer side of the outer cylinder; the slag removal unit is used to push the crushed soil and stone cut by rotary cutting out of the outer cylinder.

Description

Technical Field

[0001] The utility model relates to a drill bit, in particular to a rotary drilling machine drill bit, and belongs to the technical field of construction engineering equipment. Background Art

[0002] With the continuous development of China's construction projects, the amount of pile foundation construction continues to grow, and the complex construction environment is becoming more and more diverse. In terms of environmental protection requirements (oil fume pollution, noise), vibration noise, construction quality, and work efficiency in the pile foundation industry, bored piles have gradually replaced prefabricated piles as the mainstream form. When digging pile holes on complex and harsh construction sites, the current general method is to use a rotary drilling rig.

[0003] When working on clay layers, the clay inside the drill bit of the rotary drilling rig can easily clog the casing, and the clay inside the drill bit must be cleaned before continuing to work. The rotary drilling rig relies on the vibration of its own drill bit to clean the soil; however, the vibration of the drill bit will generate high-decibel noise during soil cleaning, causing noise pollution and affecting surrounding residents; and because there are no shielding measures, broken soil and rocks will splash everywhere and soil cleaning is difficult, which directly affects the efficiency of soil cleaning and is very inconvenient to use. In addition, in a construction environment with a mixture of hard rocks and soft soil, the cutter head is easy to break, resulting in increased construction costs and reduced construction efficiency.

[0004] Therefore, developing a practical and reliable drill bit for a rotary drilling rig with a soil cleaning device and suitable for construction in complex environments is the key to solving the above technical problems. Utility Model Content

[0005] In view of this, the utility model provides a cylindrical inverted trapezoidal blade rotary drilling rig drill bit, which can solve the problems of difficulty in clearing soil during rotary drilling rig construction and easy breakage of the cutter head in complex construction environments, thereby improving drilling efficiency and saving construction costs.

[0006] The technical solution of the utility model is: a barrel-type inverted trapezoidal blade rotary drilling machine drill bit, comprising: an outer barrel, a blade and a slag removal unit;

[0007] The outer cylinder is a hollow structure with openings at both ends, a top cover is provided at the top opening, and a plurality of blades are evenly spaced along the circumference of the bottom end surface;

[0008] The blade is of an inverted trapezoidal structure, that is, the side surface of the blade is fixed to the outer cylinder, the small end surface faces the inner side of the outer cylinder, and the large end surface faces the outer side of the outer cylinder;

[0009] The slag removal unit is used to push the crushed soil and rocks cut by rotary cutting out of the outer cylinder.

[0010] As a preferred embodiment of the utility model: the slag-removing unit comprises: a slag-removing plate and a push rod;

[0011] The slag-removing plate is located inside the outer cylinder, and one or more push rods are connected to the slag-removing plate;

[0012] The top cover is mounted on the top opening of the outer cylinder through a bearing;

[0013] The push rod passes through the top cover and extends out of the outer cylinder, and the slag-removing plate can move along the axial direction of the outer cylinder under the push of the push rod.

[0014] As a preferred embodiment of the present invention: a limiter is arranged on the push rod to limit the axial displacement of the push rod.

[0015] As a preferred embodiment of the present invention: the number of the blades is an even number, the connecting line of the center lines of two opposite blades passes through the center of the outer cylinder, and the waistline extension lines of the opposite blades pass through the center of the outer cylinder.

[0016] As a preferred embodiment of the present invention: the blade is welded to the bottom of the outer cylinder.

[0017] As a preferred embodiment of the present invention: the outer cylinder is connected to the drill rod of the rotary drilling rig, and the push rod is located within the envelope of the drill rod driving module.

[0018] Beneficial effects:

[0019] (1) The utility model has a cylindrical inverted trapezoidal blade rotary drilling rig drill bit, which can solve the problems of clay in the drill bit being difficult to clean and blade breakage caused by complex construction environment during the drilling process, making the drilling construction smoother, improving construction efficiency and saving construction costs.

[0020] The blade of a traditional rotary drilling rig is square or rectangular. The utility model adopts an inverted trapezoidal blade structure, which can disperse the shear stress on the blade when cutting soil or rock, thereby ensuring the effective effect of the blade and increasing its service life.

[0021] (2) In the utility model, the inverted trapezoidal blades evenly arranged on the circumference have a good cutting effect on the geological layer mixed with hard rocks and clay, and the blades are not easy to break.

[0022] (3) The drill bit of the rotary drilling rig of the utility model adopts a cylindrical structure. During the rotary drilling process, the crushed soil will be collected in the casing, which can prevent the crushed soil and rocks from splashing everywhere during the rotary drilling process; and the slag removal unit is provided to facilitate soil cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the rotary drilling rig drill bit of the utility model with a cylindrical inverted trapezoidal blade;

[0024] Figure 2 It is a cross-sectional view of the rotary drilling rig drill bit with a cylindrical inverted trapezoidal blade of the utility model;

[0025] Figure 3 The utility model is a schematic diagram of the structure of the blade in the rotary drilling rig drill bit.

[0026] Among them: 1-outer cylinder, 2-blade, 3-slag removal plate, 4-push rod, 5-top cover, 6-bearing. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] The present embodiment provides a rotary drilling rig drill bit with a cylindrical inverted trapezoidal blade, which solves the problems of clay in the drill bit being difficult to clean and blade breakage caused by a complex construction environment during the drilling process, making the drilling construction smoother, improving construction efficiency and saving construction costs.

[0029] like Figure 1 and Figure 2 As shown, the cylindrical inverted trapezoidal blade rotary drilling rig drill bit comprises: an outer cylinder 1, a blade 2 arranged at the bottom of the outer cylinder 1 and a slag removal unit arranged inside the outer cylinder 1.

[0030] The outer cylinder 1 is a hollow structure with openings at both ends, and a plurality of blades 2 are evenly distributed along the circumferential direction on the bottom end surface thereof; as an example, the blades 2 are welded to the bottom of the outer cylinder 1, and the welding process technology adopts carbon dioxide gas shielded welding, and the welding material is ER50-6.H8Mn2S welding wire.

[0031] like Figure 3 As shown; the blade 2 is an inverted trapezoidal structure (i.e., a trapezoidal body), that is, the side surface of the trapezoidal structure is fixed to the outer cylinder 1, the top surface (i.e., the small end surface) faces the inner side of the outer cylinder 1, and the bottom surface (i.e., the large end surface) faces the outer side of the outer cylinder 1, which can effectively and quickly cut geological layers mixed with rocks and clays with relatively high hardness; the number of blades 2 is an even number, so that the connecting line of the center lines of the two opposing blades 2 passes through the center of the outer cylinder 1; and the waistline extension lines of the two opposing blades 2 pass through the center of the outer cylinder 1 (used to ensure the accuracy when installing the blades and evenly distribute the external stress during use).

[0032] The slag-removing unit is used to push the crushed soil and rocks out of the outer cylinder 1; the slag-removing unit includes: a slag-removing plate 3 and a push rod 4; the slag-removing plate 3 is located inside the outer cylinder 1 and can move along the axial direction of the outer cylinder 1 under the action of the slag-removing driving unit. The push rod 4 is connected to the slag-removing plate 3 to push the slag-removing plate 3 to move inside the outer cylinder 1.

[0033] As an example, two or three push rods 4 are evenly spaced along the circumferential direction on the upper end surface of the slag-removing plate 3, and the slag-removing plate 3 and the push rods 4 are welded by ordinary welding.

[0034] As an example, the push rod 2 is made of steel bars.

[0035] The top cover 5 is installed at the top opening of the outer cylinder 1 through the bearing 6, and the top cover 5 is connected to the outer cylinder 1 through the bearing 6. The top cover 5 is provided with through holes corresponding to the push rods 4 for the push rods 4 to pass through, and the hole wall does not contact the push rods 4. By pushing the push rods 4, the slag removal plate 3 can be pushed to move in the outer cylinder 1.

[0036] As an example, a limiter is provided on the push rod 4 to limit the axial displacement of the push rod 2, so as to ensure that the slag removal plate 3 and the push rod 4 will not fall out of the outer cylinder 1; the setting position of the limiter is determined by the height of the outer cylinder 1, and when the slag removal plate 3 moves to the lower end of the outer cylinder 1 (that is, when the slag removal plate 3 is flush with the lower end surface of the outer cylinder 1), the limiter contacts the top cover 5 to limit the downward movement of the push rod. For example, the limiter can be a limit protrusion provided on the push rod 4, and when the slag removal plate 3 moves to the lower end of the outer cylinder 1, the limit protrusion contacts the upper end surface of the top cover 5.

[0037] The working process of the cylindrical inverted trapezoidal blade rotary drilling rig drill bit is: the drill bit is installed on the rotary drilling rig mechanical arm, specifically, the outer cylinder 1 is connected to the drill rod of the rotary drilling rig (the drill rod can be axially retracted) (a driving module for driving the drill rod to rotate is provided on the mechanical arm); the installation interface adopts the industry-wide interface.

[0038] Initially, the slag plate 3 in the outer cylinder 1 is at the bottom of the outer cylinder 1; when the rotary excavation is carried out, a protective cylinder is buried at a designated point, the rotary excavator is in place, and the rotary excavator is started to construct the working ground. The outer cylinder 1 rotates under the drive of the drill rod, and the inverted trapezoidal blade 2 welded to the bottom of the outer cylinder 1 rotates with the outer cylinder 1 to cut the soil and rocks on the working surface. The inverted trapezoidal blade 2 evenly arranged on the circumference has a good cutting effect on the geological layer with a mixture of hard rocks and clay, and the blade is not easy to break; because the top cover 5 and the outer cylinder 1 are connected by the bearing 6, when the outer cylinder 1 and the blade 2 rotate, the top cover 5 and the slag plate 3 and the connecting rod 4 do not rotate with the drill bit, and the crushed soil and rocks enter the outer cylinder 1 under the upward pressure, pushing the slag plate 3 and the connecting rod 4 in the outer cylinder 1 to move upward; until the crushed soil and rocks fill the outer cylinder 1. The drill rod stops rotating and the drill bit stops crushing the soil at the same time. The mechanical arm of the rotary drilling rig is lifted to lift the drill bit loaded with soil to the hole mouth, completing a soil removal operation. The drill bit loaded with soil is lifted to the hole mouth for cleaning.

[0039] When the mechanical arm of the rotary drilling machine lifts the drill bit out of the drill hole and performs soil cleaning, the push rod 4 is pushed to push the slag return plate 3 to move downward in the outer cylinder 1 to squeeze the broken soil and rocks in the outer cylinder 1. Under the action of the slag return plate 3, the broken soil and rocks in the drill bit outer cylinder 1 can be quickly discharged from the outer cylinder 1. When the slag return plate 3 moves to the bottom of the outer cylinder 1, soil cleaning is completed, and the rotary drilling machine can perform a new round of rotary drilling.

[0040] As an example, the push rod 4 is located within the envelope range of the drill rod driving module. After the rotary drilling rig's mechanical arm is lifted, the drill rod driving module drives the drill bit to retract (i.e., move upward). During the upward movement of the drill bit, the push rod 4 contacts the drill rod driving module, whereby the drill rod driving module squeezes the push rod 4 downward, causing the push rod 4 to drive the slag return plate 3 to move downward, thereby squeezing the broken soil and rocks in the outer cylinder 1 outward.

[0041] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A cylindrical inverted trapezoidal blade rotary drilling machine drill bit, characterized in that: include: An outer cylinder (1), a blade (2) and a slag removal unit; The outer cylinder (1) is a hollow structure with openings at both ends, a top cover (5) is provided at the top opening, and a plurality of blades (2) are evenly spaced along the circumferential direction on the bottom end surface; The blade (2) is of an inverted trapezoidal structure, the side surface of the blade (2) is fixed to the outer cylinder (1), the small end surface faces the inner side of the outer cylinder (1), and the large end surface faces the outer side of the outer cylinder (1); The slag removal unit is used to push the rotary cut crushed soil and rocks out of the outer cylinder (1).

2. The cylindrical inverted trapezoidal blade rotary drilling machine drill bit according to claim 1, characterized in that: The slag-removing unit comprises: a slag-removing plate (3) and a push rod (4); The slag-removing plate (3) is located inside the outer cylinder (1), and one or more push rods (4) are connected to the slag-removing plate (3); The top cover (5) is installed at the top opening of the outer cylinder (1) via a bearing (6); The push rod (4) passes through the top cover (5) and extends out of the outer cylinder (1); the slag removal plate (3) can move along the axial direction of the outer cylinder (1) under the push of the push rod (4).

3. The cylindrical inverted trapezoidal blade rotary drilling machine drill bit according to claim 2, characterized in that: The push rod (4) is provided with a limiter for limiting the axial displacement of the push rod (4).

4. The cylindrical inverted trapezoidal blade rotary drilling machine drill bit according to any one of claims 1 to 3, characterized in that: The number of the blades (2) is an even number, the connecting line of the center lines of two opposite blades (2) passes through the center of the outer cylinder (1), and the extended lines of the waist lines of the opposite blades (2) pass through the center of the outer cylinder (1).

5. The cylindrical inverted trapezoidal blade rotary drilling machine drill bit according to any one of claims 1 to 3, characterized in that: The blade (2) is welded to the bottom of the outer cylinder (1).

6. The cylindrical inverted trapezoidal blade rotary drilling machine drill bit according to claim 2 or 3, characterized in that: The outer cylinder (1) is connected to a drill rod of a rotary drilling machine, and the push rod (4) is located within the envelope of a drill rod driving module.

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