Rotary excavating square hole drill bit

Abstract

The invention discloses a rotary digging square hole drill bit which comprises a drill cylinder, a drill rod, a drill rod, a drill rod, a drill rod, a drill rod, a drill rod, a drill rod and a rotary drill rod. The lower opening end of the drill cylinder is square, and the upper closed end of the drill rod is provided with a through hole. The drill bit is arranged outside the lower opening end and eccentrically arranged with the driving shaft, the drill bit is shaped like a falling triangle, and notches are formed in the three side parts of the drill bit respectively; the linkage structure comprises a coupling piece and a transmission shaft, the coupling piece is provided with two through holes arranged side by side, the lower end of the driving shaft is rotatably arranged in one through hole in a penetrating mode, the lower end of the transmission shaft is coaxially connected to the drill bit, the upper end of the transmission shaft is rotatably arranged in the other through hole in a penetrating mode, and the driving shaft is coaxially connected with a driving gear. The upper end of the transmission shaft is coaxially connected with a driven gear; the driving gear is meshed with the driven gear; the shaft sleeve is arranged in the middle of the driving shaft in a sleeving mode and arranged in the drilling barrel, and the shaft sleeve is connected with a spiral blade. The problem that the construction efficiency is low due to the fact that the existing square hole excavation technology mostly adopts manual excavation is solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a rotary square hole drill bit. Background Art

[0002] As the requirements for bearing capacity and stability in construction projects are increasing, square hole piles are gradually being widely used in various projects due to their large bearing capacity and unique cross-sectional shape. Square hole pile drilling rig technology has also emerged to meet the needs of square hole pile construction. Compared with round piles of the same cross-sectional area, square hole piles have a larger surface area and stiffness. Therefore, under the condition of obtaining the same bearing capacity, the length of the pile body can be reduced, saving engineering costs.

[0003] The straight arm of the square hole pile cannot withstand the large horizontal soil pressure, which makes the hole-making process relatively complicated. At present, the mechanical construction of square hole piles is still mainly in the manual excavation stage. The existing square hole excavation technology is mostly manual excavation, and the mechanical hole-making is expensive and the hole-making effect is average. Summary of the invention

[0004] In order to overcome the defects of the prior art, a rotary square hole drill is provided to solve the problem that the current square hole excavation technology is mostly manual excavation and has low construction efficiency.

[0005] In order to achieve the above object, a rotary drilling square hole drill bit is provided, comprising:

[0006] A drill tube, the drill tube having a lower open end and an upper closed end, the lower open end is square, the upper closed end is provided with a through hole, and a driving shaft is rotatably passed through the through hole;

[0007] A drill bit is arranged outside the lower opening end and eccentrically arranged with respect to the driving shaft, the drill bit is in the shape of a triangle, three sides of the drill bit are respectively formed with notches, the side of the drill bit has a front end and a rear end opposite to each other in the rotation direction of the drill bit, and the notch is arranged at the rear end;

[0008] The linkage structure comprises a coupling and a transmission shaft, wherein the coupling is provided with two through holes arranged side by side, the lower end of the driving shaft is rotatably inserted into one through hole, the lower end of the transmission shaft is coaxially connected to the drill bit, the upper end of the transmission shaft is rotatably inserted into the other through hole, the driving shaft is coaxially connected to a driving gear, the upper end of the transmission shaft is coaxially connected to a driven gear, and the driving gear is meshed with the driven gear;

[0009] A shaft sleeve is sleeved on the middle part of the driving shaft and arranged in the drill tube, and the shaft sleeve is connected with a spiral blade.

[0010] Furthermore, the drill tube includes a bottomless circular cylinder with a cover and a square positioning frame, the lower mouth of the circular cylinder is coaxially connected to the positioning frame, the top of the circular cylinder is provided with the through hole, and the through hole is coaxially arranged with the circular cylinder.

[0011] Furthermore, the shape and size of the hole cut by the drill bit are adapted to the shape and size of the positioning frame.

[0012] Furthermore, the length of the notch is three quarters of the length of the side of the drill bit.

[0013] Furthermore, the shaft sleeve is movably mounted on the middle portion of the driving shaft, and a driving structure for driving the shaft sleeve is installed on the driving shaft.

[0014] Furthermore, the driving structure includes:

[0015] A first tooth pattern is formed in the inner hole of the sleeve, and the first tooth pattern is arranged in a circle along the circumferential direction of the sleeve;

[0016] A second tooth pattern is formed in the middle of the driving shaft, and the second tooth pattern is arranged along the circumference of the driving shaft.

[0017] A plurality of planetary gears are provided between the shaft sleeve and the driving shaft, the opposite sides of the planetary gears are respectively engaged with the first tooth pattern and the second tooth pattern, the plurality of planetary gears are rotatably connected to a bracket, and the bracket is fixedly connected to the drill barrel.

[0018] The beneficial effect of the present invention is that after the rotary square hole drill bit of the present invention is driven to rotate by the drilling rig, the drill bit is driven to make a small eccentric rotation through the linkage structure to cut the soil layer. The crushed soil generated by the drill bit cutting the soil layer is collected in the drill barrel by driving the spiral blade to rotate through the active shaft. When the drill rod is lifted, the spiral blade is driven in reverse to discharge the crushed soil from the drill barrel. Taking the comprehensive unit price of a manually dug pile with a pile diameter of 1m as about 620 yuan / m, the mechanical rotary pile using the rotary square hole drill bit of the present invention is about 500 yuan / m. Since the manually dug pile needs to be protected by a wall for every linear meter, the construction period is about 10 times that of the mechanical rotary pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 It is a schematic structural diagram of a rotary square hole drill bit according to an embodiment of the present invention.

[0021] Figure 2 It is a bottom view of the rotary square hole drill bit according to an embodiment of the present invention.

[0022] Figure 3 Schematic diagram of the linkage structure of an embodiment of the present invention.

[0023] Figure 4 Schematic diagram of the driving structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the inventions. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Reference Figures 1 to 4 As shown, the present invention provides a rotary square hole drill bit, comprising: a drill barrel 1, a drill bit 2, a linkage structure 3 and a shaft sleeve 4.

[0027] The drill tube 1 has a lower open end and an upper closed end. The lower open end of the drill tube 1 is square. The upper closed end of the drill tube 1 is provided with a through hole. A driving shaft 13 is rotatably passed through the through hole of the upper closed end of the drill tube 1. The upper end of the driving shaft 13 extends above the upper closed end of the drill bit and is connected to the driving system of the drilling rig. The drill tube is used to be installed on the drill rod of the drilling rig.

[0028] The drill bit 2 is arranged below the lower opening end of the drill tube 1. The drill bit 2 is eccentrically arranged with respect to the driving shaft 13. The drill bit 2 is in the shape of a triangle. When the drill bit 2 is slightly eccentric, the edge motion trajectory is a slightly curved square.

[0029] The three sides of the drill bit 2 are respectively formed with notches 20. The side of the drill bit 2 has a front end and a rear end opposite to each other in the rotation direction of the drill bit 2. The notch 20 is provided at the rear end.

[0030] The linkage structure 3 includes a coupling 31 and a transmission shaft 32. The coupling 31 is provided with two through holes arranged side by side. The lower end of the driving shaft 13 is rotatably inserted into one through hole. The lower end of the transmission shaft 32 is coaxially connected to the drill bit 2. The upper end of the transmission shaft 32 is rotatably inserted into the other through hole. The driving shaft 13 is coaxially connected with a driving gear 33. The upper end of the transmission shaft 32 is coaxially connected with a driven gear 34. The driving gear 33 is meshed with the driven gear 34.

[0031] The shaft sleeve 4 is sleeved on the middle part of the driving shaft 13 and is arranged in the drill tube 1. The shaft sleeve 4 is connected with a spiral blade 41.

[0032] When the drilling rig drives the driving shaft to rotate, the linkage structure drives the drill bit to make a small eccentric rotation to cut the soil layer. The crushed soil produced by the drill bit cutting the soil layer is collected in the drill barrel by the spiral blade driven by the driving shaft. When the drill rod is lifted, the spiral blade is driven in the reverse direction to discharge the crushed soil from the drill barrel.

[0033] The comprehensive unit price of a manual bored pile with a pile diameter of 1m is about 620 yuan / m, and the mechanical bored pile using the rotary square hole drill bit of the present invention is about 500 yuan / m. Since the manual bored pile needs to be protected by a wall for each meter, the construction period is about 10 times that of the mechanical bored pile.

[0034] In this embodiment, the drill tube 1 includes a circular cylinder 11 and a positioning frame 12. The circular cylinder 11 is cylindrical and has a cover without a bottom. The positioning frame 12 is square. The side length of the positioning frame 12 is equal to the diameter of the circular cylinder. The lower cylinder mouth of the circular cylinder 11 is coaxially connected to the positioning frame 12. The top of the circular cylinder 11 is provided with a through hole. The through hole is coaxially arranged with the circular cylinder 11.

[0035] In this embodiment, the shape and size of the hole cut by the drill bit 2 are adapted to the shape and size of the positioning frame 12 .

[0036] As a preferred embodiment, the length of the notch 20 is three quarters of the length of the side of the drill bit 2. Cutting off 3 / 4 of the arc along the side of the Reuleaux triangle makes the three corners of the drill bit 2 sharper and facilitates cutting work.

[0037] See also Figure 4 As shown, the shaft sleeve 4 is movably sleeved on the middle part of the driving shaft 13. A driving structure for driving the shaft sleeve 4 is installed on the driving shaft 13.

[0038] Specifically, the driving structure includes: a first tooth pattern, a second tooth pattern, and a planetary gear 51 .

[0039] The first tooth pattern is formed in the inner hole of the sleeve 4. The first tooth pattern is arranged along the circumference direction of the sleeve 4 in a circle.

[0040] The second tooth pattern is formed in the middle of the driving shaft 13. The second tooth pattern is arranged along the circumference direction of the driving shaft 13 in a circle.

[0041] There are multiple planetary gears 51. In this embodiment, there are three planetary gears 51. The planetary gears 51 are arranged between the shaft sleeve 4 and the driving shaft 13. The opposite sides of the planetary gears 51 are respectively engaged with the first tooth pattern and the second tooth pattern. The multiple planetary gears 51 are rotatably connected to the bracket 52. The bracket 52 is fixedly connected to the drill pipe 1.

[0042] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A rotary square hole drill bit, characterized in that: include: A drill tube, the drill tube having a lower open end and an upper closed end, the lower open end is square, the upper closed end is provided with a through hole, and a driving shaft is rotatably passed through the through hole; A drill bit is arranged outside the lower opening end and eccentrically arranged with respect to the driving shaft, the drill bit is in the shape of a triangle, three sides of the drill bit are respectively formed with notches, the side of the drill bit has a front end and a rear end opposite to each other in the rotation direction of the drill bit, and the notch is arranged at the rear end; The linkage structure comprises a coupling and a transmission shaft, wherein the coupling is provided with two through holes arranged side by side, the lower end of the driving shaft is rotatably inserted into one through hole, the lower end of the transmission shaft is coaxially connected to the drill bit, the upper end of the transmission shaft is rotatably inserted into the other through hole, the driving shaft is coaxially connected to a driving gear, the upper end of the transmission shaft is coaxially connected to a driven gear, and the driving gear is meshed with the driven gear; A shaft sleeve is sleeved on the middle part of the driving shaft and arranged in the drill tube, and the shaft sleeve is connected with a spiral blade.

2. The rotary square hole drill bit according to claim 1, characterized in that: The drill tube comprises a bottomless circular cylinder with a cover and a square positioning frame, the lower tube mouth of the circular cylinder is coaxially connected to the positioning frame, the top of the circular cylinder is provided with the through hole, and the through hole is coaxially arranged with the circular cylinder.

3. The rotary square hole drill bit according to claim 2, characterized in that: The shape and size of the hole cut by the drill bit are adapted to the shape and size of the positioning frame.

4. The rotary square hole drill bit according to claim 1, characterized in that: The length of the notch is three quarters of the length of the side of the drill bit.

5. The rotary square hole drill bit according to claim 1, characterized in that: The shaft sleeve is movably sleeved in the middle of the driving shaft, and a driving structure for driving the shaft sleeve is installed on the driving shaft.

6. The rotary square hole drill bit according to claim 5, characterized in that: The driving structure comprises: A first tooth pattern is formed in the inner hole of the sleeve, and the first tooth pattern is arranged in a circle along the circumferential direction of the sleeve; A second tooth pattern is formed in the middle of the driving shaft, and the second tooth pattern is arranged along the circumference of the driving shaft. A plurality of planetary gears are provided between the shaft sleeve and the driving shaft, the opposite sides of the planetary gears are respectively engaged with the first tooth pattern and the second tooth pattern, the plurality of planetary gears are rotatably connected to a bracket, and the bracket is fixedly connected to the drill barrel.

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