Rotary soil cutting drill bit special for large-opening well

Abstract

The rotary soil cutting drill bit special for the large-mouth well comprises a rectangular mounting pipe fixedly connected to the top face of a drill bit body, a positioning pipe is inserted into the mounting pipe, an L-shaped cutter is inserted into a gap between the positioning pipe and the mounting pipe, and a pin column elastically connected into the positioning pipe is inserted into a positioning hole in the mounting pipe. And a limiting plate clamped with a mounting groove formed in the cutter is arranged on the outer wall of the positioning pipe. By pressing the pin column into the mounting pipe, limitation on the positioning pipe can be relieved, so that the cutter and the positioning pipe can be pulled out of the mounting pipe, and the convenience of dismounting and mounting of the cutter is improved.

Description

Technical Field

[0001] This application relates to the technical field of drilling equipment, and more particularly, to a rotary soil-cutting bit dedicated for large-diameter wells. Background Art

[0002] In the field of drilling engineering, cutting blades are arranged on the drill bit of the drilling project and are used to scrape the soil layer around the borehole when following the rotation and advancement of the drill bit, thereby enabling the construction of large-diameter wells. Most of the existing cutting blades are welded or bolted to the drill bit, resulting in inconvenient disassembly and assembly of the cutting blades. Summary of the Utility Model

[0003] The purpose of this application is to propose a rotary soil-cutting bit dedicated for large-diameter wells to improve the convenience of disassembly and assembly.

[0004] The embodiments of this application are implemented as follows:

[0005] This application provides a rotary soil-cutting bit dedicated for large-diameter wells, including a rectangular installation pipe fixedly connected to the top surface of the drill bit. A positioning pipe is inserted into the installation pipe. An L-shaped cutting blade is inserted into the gap between the positioning pipe and the installation pipe. A pin column elastically connected inside the positioning pipe is inserted into a positioning hole on the installation pipe. A limiting plate is provided on the outer wall of the positioning pipe and is clamped with an installation groove formed on the cutting blade.

[0006] By pressing the pin column into the interior of the installation pipe in this application, the restriction on the positioning pipe can be released, enabling the cutting blade and the positioning pipe to be withdrawn from the installation pipe, thereby improving the convenience of disassembly and assembly of the cutting blade.

[0007] In an alternative embodiment, the installation pipe is fixedly connected to a rib plate on the top surface of the drill bit.

[0008] In an alternative embodiment, the installation pipes are evenly distributed along the circumferential direction of the drill bit.

[0009] In an alternative embodiment, the inner end of the installation pipe is closed.

[0010] In an alternative embodiment, the positioning holes are provided on the top surface of the installation pipe.

[0011] In an alternative embodiment, the positioning pipe is configured as a rectangle in cross-section.

[0012] In an alternative embodiment, a rectangular guide plate is clamped inside the positioning pipe. The pin column is screwed onto the guide plate, and a spring is inserted into the pin column.

[0013] In an alternative embodiment, the pin column is perpendicularly arranged with respect to the guide plate.

[0014] In an alternative embodiment, the installation groove extends along the longitudinal direction of the cutting blade.

[0015] In an alternative embodiment, the limiting plate abuts against one end of the installation groove close to the installation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only for explaining the present application and not for limiting the scope of the present application. In the drawings:

[0017] Figure 1 is a schematic diagram of a special rotary earth-cutting bit for large-diameter wells according to an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of the installation of a cutting tool and a positioning pipe according to an embodiment of the present application;

[0019] Figure 3 is an exploded view of a cutting tool and a positioning pipe according to an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of the installation of a pin according to an embodiment of the present application;

[0021] REFERENCE NUMERALS:

[0022] 10, bit;

[0023] 20, installation pipe;

[0024] 30, positioning pipe;

[0025] 40, cutting tool;

[0026] 11, rotating shaft;

[0027] 12, rib plate;

[0028] 21, positioning hole;

[0029] 31, pin;

[0030] 311, guide plate;

[0031] 312, spring;

[0032] 32, limiting plate;

[0033] 41, installation groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Embodiment 1

[0035] Please refer to Figures 1-4 , this embodiment provides a special rotary earth-cutting bit for large-diameter wells to improve the convenience of disassembling and assembling the cutting tool.

[0036] In this embodiment, the special rotary soil-cutting bit for large-diameter wells includes a bit 10, a mounting pipe 20, a positioning pipe 30, and a cutting tool 40. Among them, the rectangular mounting pipe 20 is fixedly connected to the top surface of the bit 10. The positioning pipe 30 is inserted into the interior of the mounting pipe 20. The L-shaped cutting tool 40 is inserted into the gap between the positioning pipe 30 and the mounting pipe 20. And the pin 31 elastically connected inside the positioning pipe 30 is inserted into the positioning hole 21 on the mounting pipe 20. The limiting plate 32 fixedly connected to the outer wall of the positioning pipe 30 is clamped with the mounting groove 41 formed on the cutting tool 40.

[0037] In this embodiment, by pressing the pin 31 into the interior of the mounting pipe 20, the restriction on the positioning pipe 30 can be released, so that the cutting tool 40 and the positioning pipe 30 can be withdrawn from the mounting pipe 20, improving the convenience of disassembly and assembly of the cutting tool.

[0038] Refer to Figure 1 , it should be noted that a rotating shaft 11 is fixedly connected to the axis of the bit 10. The bit 10 rotates synchronously with the rotating shaft 11 in the direction shown by the arrow in the figure. A rib plate 12 is welded on the top surface of the bit 10. The rib plate 12 is arranged radially along the bit 10. The rib plate 12 is used to improve the connection strength between the bit 10 and the rotating shaft 11.

[0039] Refer to Figures 2-3 , in this embodiment, the mounting pipe 20 is a hollow rectangular pipe. One outer side wall of the mounting pipe 20 is attached to and fixedly welded to the rib plate 12. The mounting pipe 20 is arranged perpendicular to the rotating shaft 11 as a whole. Two mounting pipes 20 are arranged uniformly along the circumference of the bit 10. And the inner end of the mounting pipe 20 is closed and the outer end is open. The positioning hole 21 is opened on the top surface of the mounting pipe 20. And the axis of the positioning hole 21 is arranged perpendicular to the top surface of the mounting pipe 20. The mounting pipe 20 is used to insert the positioning pipe 30 and the cutting tool 40.

[0040] Refer to Figures 2-4 , in this embodiment, the positioning pipe 30 is a hollow rectangular pipe. The positioning pipe 30 is arranged at the upper left corner of the inner cavity of the mounting pipe 20 as a whole. A rectangular guide plate 311 is clamped inside the positioning pipe 30. The pin 31 is screwed onto the guide plate 311. A spring 312 is inserted into the pin 31. The spring 312 is compressed between the bottom surface of the rectangular inner cavity of the positioning pipe 30 and the top surface of the inner cavity of the pin 31. The spring 312 is used to push the pin 31 out of the top surface of the positioning pipe 30.

[0041] It should be noted that the guide plate 311 is constructed as a whole in the shape of a rectangular plate. The left and right side walls of the guide plate 311 are respectively fitted with the left and right inner walls of the inner cavity of the positioning tube 30. The pin 31 passes through the guide plate 311 and is threadedly connected to the guide plate 311. A circular through hole that matches the shape of the pin 31 is provided on the top surface of the positioning tube 30. The pin 311 can be axially slidably inserted into the aforementioned through hole. The pin 31 is arranged vertically with the guide plate 311 as a whole. An inner cavity for accommodating the spring 312 is opened at the axis of the pin 31. By changing the screwing depth of the pin 31 on the guide plate 311, the distance that the pin 31 as a whole extends out of the positioning tube 30 can be adjusted.

[0042] In addition, a rectangular limiting plate 32 is welded on the lower side wall of the positioning tube 30. The limiting plate 32 is arranged along the width direction of the lower side wall of the positioning tube 30 as a whole. The limiting plate 32 is used to engage with the mounting groove 41 on the cutter 40 to limit the cutter 40 inside the mounting tube 20.

[0043] See also Figures 1-3 In this embodiment, the cutter 40 is constructed into an L-shape along the cross section. The cutter 40 is arranged as a whole at the lower right corner of the inner cavity of the mounting tube 20. The vertical side plate of the cutter 40 is clamped between the positioning tube 30 and the right side plate of the mounting tube 20. The horizontal side plate of the cutter 40 is clamped between the positioning rod 30 and the lower side plate of the mounting tube 20. The mounting groove 41 is opened on the horizontal side plate of the cutter 40, and the mounting groove 41 extends along the longitudinal direction of the cutter 40. The mounting groove 41 is a notch formed on the horizontal side plate of the cutter 40. After being installed in place, the limit plate 32 abuts against one end of the mounting groove 41 close to the mounting tube 20.

[0044] During installation, first insert the cutter 40 into the mounting tube 20 along the lower right corner of the mounting tube 20. When the inner end of the cutter 40 abuts against the inner end plate of the mounting tube 20, the mounting groove 41 is located as a whole on the outside of the mounting tube 41. Then insert the positioning tube 30 into the mounting tube 20 along the upper left corner of the mounting tube 20. At this time, the limit plate 32 follows the positioning tube 30 inside the mounting groove 41 to move toward the mounting tube 20. When the inner end of the positioning tube 30 abuts against the inner end plate of the mounting tube 20, the pin 31 is pushed by the spring 312 to be inserted into the positioning hole 21 on the top surface of the mounting tube 20, and the limit plate 32 moves to the end of the mounting groove 41 close to the mounting tube 20. The blocking effect of the limit plate 32 can prevent the cutter 40 from moving out of the mounting tube 20.

[0045] During disassembly, the pin 31 is pressed to disengage it from the positioning hole 21 . At this time, the positioning tube 20 is free from restriction and the positioning tube 20 can be synchronously removed from the mounting tube 20 by pulling the cutter 40 outward and utilizing the clamping connection between the mounting groove 41 and the limiting plate 32 .

[0046] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A rotary soil cutting drill bit for large wells, characterized in that: It includes a rectangular mounting tube fixedly connected to the top surface of the drill bit, a positioning tube is inserted in the mounting tube, an L-shaped cutter is inserted in the gap between the positioning tube and the mounting tube, a pin elastically connected in the positioning tube is inserted in the positioning hole on the mounting tube, and a limiting plate is provided on the outer wall of the positioning tube to be clamped with the mounting groove formed on the cutter.

2. The rotary earth-cutting drill bit for large wells as claimed in claim 1, characterized in that: The mounting tube is fixedly connected to the rib plate on the top surface of the drill bit.

3. The rotary earth-cutting drill bit for large wells as claimed in claim 2, characterized in that: The mounting tubes are evenly distributed along the circumference of the drill bit.

4. The rotary earth-cutting drill bit for large wells as claimed in claim 3, characterized in that: The inner end of the mounting tube is closed.

5. The rotary earth-cutting drill bit for large wells as claimed in claim 4, characterized in that: The positioning hole is arranged on the top surface of the mounting tube.

6. The rotary earth-cutting drill bit for large wells as claimed in claim 5, characterized in that: The positioning tube is configured in a rectangular shape along a cross section.

7. The rotary earth-cutting drill bit for large wells as claimed in claim 6, characterized in that: A rectangular guide plate is clamped inside the positioning tube, the pin is screwed on the guide plate, and a spring is inserted inside the pin.

8. The rotary earth-cutting drill bit for large wells as claimed in claim 7, characterized in that: The pin is arranged perpendicular to the guide plate.

9. The rotary earth-cutting drill bit for large wells as claimed in claim 8, characterized in that: The mounting groove extends along the longitudinal direction of the cutter.

10. The rotary earth-cutting drill bit for large wells as claimed in claim 9, characterized in that: The limiting plate abuts against one end of the mounting groove close to the mounting tube.

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