Drill bit of rotary drilling rig for cleaning sediment at bottom of hole

Abstract

The utility model relates to a drill bit of a rotary drilling rig for cleaning sediment at the bottom of a hole, which comprises a barrel, a fixed bottom plate fixedly connected with the barrel and a movable bottom plate coaxially connected with the fixed bottom plate through a central shaft of the barrel are arranged at the bottom of the barrel, and a pair of soil inlets distributed in an oblique symmetry manner along the central shaft are arranged on the plate surface of the fixed bottom plate. The plate surface of the movable bottom plate is provided with a pair of soil scraping openings which are obliquely and symmetrically distributed along the shaft core, and the area of the soil inlet is smaller than that of the soil scraping openings; an inclined plate is arranged on the fixed bottom plate on one side of the pair of soil inlets, the inclined plate is obliquely arranged in the anticlockwise direction of the barrel body, a bottom cleaning scraping strip is arranged on the movable bottom plate on one side of the pair of soil scraping openings, and the inclined plate and the bottom cleaning scraping strip are oppositely distributed along a barrel core of the barrel body; sediment between the bottom plate of the drill bit barrel and the hole bottom is shoveled in and taken out along with drill lifting, and the bottom cleaning effect is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of rotary drilling rig drill bit technology, and in particular relates to a rotary drilling rig drill bit for cleaning sediment at the bottom of the hole. Background Technology

[0002] In rotary drilling rig pile foundation construction, excessive sediment after hole formation can make it difficult to lower the reinforcement cage. If secondary hole cleaning is not done properly, it can also lead to quality problems such as reduced pile bearing capacity and structural settlement. Due to the height difference between the slag bucket body and the bucket teeth, there is always about 30cm of sediment present. Especially when the sediment is sand, the adhesion between the sediment particles is insufficient, and they are often in a dispersed state, making it even more difficult to clean the bottom of the rotary drilling rig slag bucket.

[0003] Although some bottom-cleaning drill bits have appeared on the market, their specific structure and principle are as follows: The bottom plate of the rotary drilling bit consists of a fixed bottom plate directly connected to the cylinder, and a movable bottom plate connected to the fixed bottom plate through the central axis of the cylinder. During bottom cleaning, the movable bottom plate directly contacts the bottom of the hole. Simultaneously, the drill rod rotates clockwise. Due to the frictional resistance of the bottom of the hole, the fixed bottom plate and the movable bottom plate are relatively displaced, causing the movable bottom plate to hit the limit block, opening the soil inlet channel. The drill rod then presses down to simultaneously inlet the soil. After the soil inlet is completed, by rotating the drill rod counterclockwise, the fixed bottom plate and the movable bottom plate are relatively displaced in the opposite direction, the bucket gate closes, and the drill rod is lifted. Although the cutting teeth (i.e., bucket teeth) have been removed, shortening the gap between the cylinder bottom plate and the bottom of the hole, there is still considerable room for improvement. For example, the initial soil removal drilling is not very efficient, and after the bucket gate closes, the amount of sediment remaining in the gap between the drill bit cylinder bottom plate and the bottom of the hole is still relatively large. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a rotary drilling bit for cleaning sediment at the bottom of a hole.

[0005] The purpose of this utility model is achieved through the following technical solution: a rotary drilling rig bit for cleaning sediment at the bottom of a borehole includes a cylinder. The bottom of the cylinder is provided with a fixed base plate fixedly connected to the cylinder, and a movable base plate is coaxially connected to the fixed base plate through the central axis of the cylinder. A pair of soil inlets are obliquely symmetrically distributed along the axis on the surface of the fixed base plate, and a pair of soil scraping openings are obliquely symmetrically distributed along the axis on the surface of the movable base plate. The area of ​​the soil inlets is smaller than the area of ​​the soil scraping openings. An inclined plate is provided on the fixed base plate on one side of the pair of soil inlets. The inclined plate is arranged in an inclined manner in the counterclockwise direction of the cylinder. A bottom cleaning scraper is provided on the movable base plate on one side of the pair of soil scraping openings. The inclined plate and the bottom cleaning scraper are both distributed opposite to each other along the core of the cylinder.

[0006] The beneficial effects of this utility model are as follows: Compared with the prior art, by setting an inclined plate on the fixed base plate and cooperating with the bottom cleaning scraper on the movable base plate, the bottom sediment is cleaned better. After cleaning, the movable base plate is rotated to close with the fixed base plate, that is, the bottom cleaning scraper and the inclined plate are closed together, shoveling the sediment between the drill bit body base plate and the bottom of the hole, and bringing it out with the drill bit. The purpose of setting the inclined plate is that if the drill bit encounters a hard layer, it may be damaged because it does not have a cutting tool and does not have the ability to drill. The inclined plate can cooperate with the bottom cleaning scraper to further improve the bottom cleaning effect.

[0007] Preferably, the fixed base plate is provided with two limiting blocks, which are located on the side and rear of the inclined plate respectively. When the movable base plate contacts the soil and rotates, one side of the movable base plate abuts against the limiting block. With the above structure, when the movable base plate contacts the sediment soil, the movable base plate abuts against the limiting block through friction, resulting in better drilling stability.

[0008] Preferably, the soil inlet is fan-shaped, and when the movable base plate and the fixed base plate are closed, the surface of the movable base plate covers the soil inlet; with the above structure, when the sediment is shoveled into the cylinder, it can prevent the sediment in the cylinder from falling out.

[0009] Preferably, the scraper opening is trapezoidal in shape, and the opening of the scraper opening faces the side wall of the cylinder. The arc A of the opening is greater than the arc B of the bottom opening. This facilitates better scraping of soil and the closure between the movable bottom plate and the fixed bottom plate after scraping.

[0010] Preferably, the inclined plate is provided with a hinge block, and both sides of the hinge block are provided with hinge shafts. The fixed base plate corresponding to the hinge block is provided with a hinge seat. The hinge shaft and the hinge seat cooperate to achieve hinge connection. The connection between the inclined plate and the fixed base plate is changed to a movable shaft connection, so that the inclined plate will not affect the soil scraping efficiency.

[0011] Preferably, the fixed base plate is provided with an angle limiting block, which is located behind the two inclined plates. When the inclined plate abuts against the angle limiting block, the angle C between the inclined plate and the bottom surface of the cylinder is 60 degrees. By setting the angle limiting block, the inclined plate will not naturally become vertical to 90 degrees due to its own weight, and there is no need to use springs or other rebound mechanisms. This not only reduces costs but also improves stability.

[0012] Preferably, the bottom cleaning scraper has a vertical scraping surface in the clockwise direction of the cylinder, and the bottom cleaning scraper has an inclined smoothing surface in the counterclockwise direction of the cylinder. The inclined smoothing surface allows for further smoothing of the bottom soil layer after cleaning, while the vertical scraping surface not only improves the scraping effect but also enhances the closure between the bottom cleaning scraper and the inclined plate. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the rotary drilling rig drill bit of this utility model.

[0014] Figure 2 This is a three-dimensional exploded view of the drill bit of the rotary drilling rig according to this utility model.

[0015] The labels in the attached diagram are as follows: 1. Cylinder; 2. Fixed base plate; 3. Movable base plate; 4. Inclined plate; 5. Cleaning scraper; 6. Angle limiting block; 21. Soil inlet; 22. Limiting block; 23. Hinge seat; 31. Scraping nozzle; 41. Hinge block; 42. Hinge shaft; 51. Vertical scraping surface; 52. Inclined smoothing surface. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings: as shown in the drawings Figure 1 , 2 As shown, this utility model includes a cylindrical body 1, a fixed base plate 2 fixedly connected to the bottom of the cylindrical body 1, and a movable base plate 3 coaxially connected to the fixed base plate 2 via the central axis of the cylindrical body 1. A pair of soil inlets 21 obliquely symmetrically distributed along the axis are provided on the surface of the fixed base plate 2, and a pair of soil scraping openings 31 obliquely symmetrically distributed along the axis are provided on the surface of the movable base plate 3, wherein the area of ​​the soil inlets 21 is smaller than the area of ​​the soil scraping openings 31; an inclined plate is provided on the fixed base plate 2 on one side of the pair of soil inlets 21. 4. The inclined plates 4 are arranged in an inclined manner along the clockwise direction of the cylinder 1. A bottom cleaning scraper 5 is provided on the movable bottom plate 3 on one side of a pair of scraper openings 31. The inclined plates 4 and the bottom cleaning scraper 5 are distributed opposite to each other along the core of the cylinder 1. The bottom cleaning scraper 5 is on the diameter line of the movable bottom plate 3, and the two inclined plates 4 are on the diameter line of the fixed bottom plate 2. When the movable bottom plate 3 and the fixed bottom plate 2 are closed, the bottom cleaning scraper 5 and the inclined plates 4 close together, scraping in the sediment between the bottom plate of the drill bit cylinder and the bottom of the hole, and bringing it out with the drill bit.

[0017] Two limiting blocks 22 are provided on the fixed base plate 2, and are located on the side and rear of the inclined plate 4 respectively. When the movable base plate 3 contacts the soil and rotates, one side of the movable base plate 3 abuts against the limiting block 22.

[0018] The inlet 21 is fan-shaped. When the movable base plate 3 and the fixed base plate 2 are closed, the surface of the movable base plate 2 covers the inlet 21.

[0019] The shape of the scraper opening 31 is trapezoidal, and the opening of the scraper opening 31 faces the side wall of the cylinder 1. The arc A of the opening is greater than the arc B of the bottom opening.

[0020] The inclined plate 4 is provided with a hinge block 41, and hinge shafts 42 are provided on both sides of the hinge block 41. The fixed base plate 2 corresponding to the hinge block 41 is provided with a hinge seat 23. The hinge shafts 42 and the hinge seat 23 cooperate to achieve hinge.

[0021] An angle limiting block 6 is provided on the fixed base plate 2. The angle limiting block 6 is located behind the two inclined plates 4. When the inclined plate 4 and the angle limiting block 6 abut against each other, the angle C between the inclined plate 4 and the bottom surface of the cylinder 1 is 60 degrees.

[0022] The bottom cleaning scraper 5 has a vertical scraping surface 51 in the clockwise direction along the cylinder 1, and an inclined smoothing surface 52 in the counterclockwise direction along the cylinder 1.

[0023] When drilling to remove soil, the inclined plate 4 of the fixed base plate 2 will be lifted by the reaction force of the soil, no longer affecting the soil removal efficiency. When the soil removal is completed and reversed, it will naturally hang down and open when there is no slag, and abut against the angle limiting block 6 until it is engaged with the vertical surface 51 of the cleaning scraper 5 of the movable base plate 3. When there is slag, the inclined plate will also be inserted into the slag and soil until it is engaged with the movable base plate 3 due to the existence of the angle limiting block.

[0024] The working principle of this utility model is as follows: When drilling to extract soil, when the cylinder 1 rotates clockwise, the movable bottom plate 3 comes into contact with the bottom sediment, so that one end of the movable bottom plate abuts against the limiting block 22, and the soil inlet 21 opens (the soil inlet 21 coincides with the scraping opening 31). Then, the vertical scraping surface 51 of the movable bottom plate 3 begins to scrape the soil in the direction of rotation of the cylinder 1 and scrapes the soil into the cylinder 1. Finally, after it is full, the cylinder 1 rotates counterclockwise, and the inclined plate 4 opens by its own weight and abuts against the angle limiting block 6 until it is engaged with the vertical surface 51 of the bottom cleaning scraper 5 of the movable bottom plate 3 (the plate surface of the movable bottom plate 2 covers the soil inlet 21), and is pulled out with the drill.

[0025] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A rotary drilling rig drill bit for cleaning hole bottom sediment, comprising a barrel (1), the bottom of the barrel (1) is provided with a fixed bottom plate (2) fixedly connected with the barrel (1), and a movable bottom plate (3) coaxially connected with the fixed bottom plate (2) through the central shaft of the barrel (1), characterized in that: The fixed base plate (2) has a pair of soil inlets (21) that are obliquely symmetrically distributed along the axis. The movable base plate (3) has a pair of soil scraping ports (31) that are obliquely symmetrically distributed along the axis. The area of ​​the soil inlets (21) is smaller than the area of ​​the soil scraping ports (31). An inclined plate (4) is provided on the fixed base plate (2) on one side of the pair of soil inlets (21). The inclined plate (4) is arranged in an inclined manner along the counterclockwise direction of the cylinder (1). A bottom cleaning scraper (5) is provided on the movable base plate (3) on one side of the pair of soil scraping ports (31). The inclined plate (4) and the bottom cleaning scraper (5) are both distributed relative to each other along the core of the cylinder (1).

2. The rotary drilling bit for cleaning sediment at the bottom of a borehole according to claim 1, characterized in that: The fixed base plate (2) is provided with two limiting blocks (22), which are located on the side and rear of the inclined plate (4). When the movable base plate (3) contacts the soil and rotates, one side of the movable base plate (3) abuts against the limiting block (22).

3. The rotary drilling bit for cleaning sediment at the bottom of a borehole according to claim 1, characterized in that: The soil inlet (21) is fan-shaped. When the movable base plate (3) and the fixed base plate (2) are closed, the surface of the movable base plate (3) covers the soil inlet (21).

4. The rotary drilling bit for cleaning sediment at the bottom of a borehole according to claim 1, characterized in that: The shape of the scraper opening (31) is trapezoidal, and the opening of the scraper opening (31) faces the side wall of the cylinder (1). The arc A of the opening is greater than the arc B of the bottom opening.

5. The rotary drilling bit for cleaning sediment at the bottom of a borehole according to claim 1, characterized in that: The inclined plate (4) is provided with a hinge block (41), and hinge shafts (42) are provided on both sides of the hinge block (41). The fixed base plate (2) corresponding to the hinge block (41) is provided with a hinge seat (23). The hinge shaft (42) and the hinge seat (23) cooperate to achieve hinge.

6. The rotary drilling bit for cleaning sediment at the bottom of a borehole according to claim 1, characterized in that: Angle limiting block (6) is provided on the fixed base plate (2). The angle limiting block (6) is located behind the two inclined plates (4). When the inclined plate (4) abuts against the angle limiting block (6), the angle C between the inclined plate (4) and the bottom surface of the cylinder (1) is 60 degrees.

7. The rotary drilling bit for cleaning sediment at the bottom of a borehole according to claim 1, characterized in that: The bottom cleaning scraper (5) has a vertical scraping surface (51) in the clockwise direction of the cylinder (1), and the bottom cleaning scraper (5) has an inclined smoothing surface (52) in the counterclockwise direction of the cylinder (1).

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