Rotary drilling machine drill bit structure for square pile excavation

Abstract

The utility model relates to the field of square pile construction equipment, in particular to a drill bit structure of a rotary drilling machine for square pile excavation, which can effectively improve the soil body collecting efficiency in the square pile rotary excavating process so as to ensure smooth construction, and is characterized in that a cylindrical soil body storage box is sleeved in a soil lifting box, and a central drilling rod is arranged in the soil body storage box; the axis of the soil body storage box and the center drill rod are collinear, and a soil body conveying blade is spirally arranged on the center drill rod; and when the soil body conveying blades rotate along with the central drill rod, the soil body conveying blades upwards convey the soil body at the holes of the soil lifting box into the soil lifting box. The scheme is particularly suitable for square pile excavation construction.

Description

Technical Field

[0001] The utility model relates to the field of square pile construction equipment, in particular to a drill bit structure of a rotary drilling machine used for square pile excavation. Background Art

[0002] Square piles are superior to pipe piles in important parameters such as bearing capacity and shear resistance. However, at present, most of the various types of pile foundations are still designed as pipe piles. The main reason is that the construction method of square piles is too complicated and the cycle is long. There are currently two main methods for the construction of square piles: 1. Manual hole digging construction. This method requires a lot of manpower input. From preparation to hole digging construction, people need to perform manual operations. This labor-intensive construction method is not only time-consuming and labor-intensive, but also prone to errors and quality problems. And the safety risk is high. Due to the small construction space, accidents such as collapse and injury are prone to occur. 2. After the rotary drilling drill has made holes many times, a slotting machine is used to repair the holes. This method requires a rotary drilling machine to use a circular pile head to make holes many times, and then a slotting machine is used to repair the holes again, and then a rotary drilling machine is used to remove the remaining soil at the bottom of the pile. Multiple holes are made, the risk of hole collapse is high, and the construction cycle is long.

[0003] In the patent application with application number 2023115377936 and titled "One-time forming drill bit structure for square piles", a drill bit structure that can realize rotary excavation of square piles in one go is disclosed. In this structure, a spiral guide blade is arranged between the drill rod protection tube and the inner wall of the soil lifting box, and the side edges of the spiral guide blade are fixedly connected to the drill rod protection tube and the inner wall of the soil lifting box respectively, and the spiral guide blade is used to guide the soil entering the hole of the soil lifting box upward. After the soil excavated by the drill bit's gear wheel passes through the hole of the soil lifting box, it is piled up upward along the spiral guide blade, thereby increasing the amount of soil stored inside the soil lifting box. In actual use, this method of only transporting the soil through the hole of the soil lifting box under extrusion and allowing the soil to be transported along the spiral guide blade under extrusion is difficult to obtain an ideal soil collection effect, resulting in a large amount of excavated soil being unable to smoothly enter the soil lifting box, which seriously affects the smooth progress of construction. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a rotary drilling machine drill bit structure for square pile excavation, which can effectively improve the soil collection efficiency in the process of square pile rotary excavation, thereby ensuring smooth construction.

[0005] The utility model solves the technical problem by adopting the following technical scheme: a rotary drilling rig drill bit structure for square pile excavation, comprising a drill bit and a center drill rod, the outer contour of the drill bit being in the shape of a Lello triangle, the axis of the center drill rod being arranged in parallel with the center axis of the drill bit located at the geometric center of the drill bit, the center axis of the drill bit rotating while performing a circular motion around the axis of the center drill rod; comprising a soil lifting box with a square cross section, the center drill rod being arranged in the soil lifting box along the vertical direction, the drill bit being arranged below the soil lifting box, the bottom of the soil lifting box comprising a soil lifting box hole, the area of ​​the hole excavated by the drill bit rotating around the center drill rod being larger than the cross-sectional area of ​​the soil lifting box, a cylindrical soil storage box being sleeved in the soil lifting box, the center drill rod being arranged in the soil storage box, the axis of the soil storage box being arranged colinearly with the center drill rod, and soil conveying blades being spirally arranged on the center drill rod; when the soil conveying blades rotate with the center drill rod, the soil conveying blades convey the soil at the hole of the soil lifting box upward into the soil lifting box.

[0006] Furthermore, at least one vent hole is provided on the side wall of the soil storage box, and the vent hole connects the inside of the soil storage box with the outside.

[0007] Furthermore, the center drill rod and the drill bit are connected via a transmission gear set, and a transmission gear set bearing for sealing the bottom of the transmission gear set is arranged at the bottom of the transmission gear set, and the transmission gear set bearing includes an input gear arranged at the center, an output gear arranged around the input gear, and at least one transmission gear, the center drill rod is connected to the input gear of the transmission gear set bearing, and the center shaft of the drill bit is connected to the output gear of the transmission gear set bearing.

[0008] Furthermore, it comprises a central drill rod bearing, wherein the central drill rod bearing is sleeved on the top of the central drill rod and fixedly arranged on the top of the soil lifting box.

[0009] Furthermore, the bottom surface of the drill bit is evenly provided with teeth for digging holes.

[0010] The beneficial effect of the utility model is that in actual use, the drill bit drills the soil at the bottom into loose soil. After the loose soil passes through the hole of the soil lifting box and enters the soil lifting box, the loose soil is continuously transported upward by the soil transport blades and stored in the soil storage box because the soil transport blades rotate with the central drill rod. Compared with the existing method that relies solely on soil extrusion, the soil transport blades of this scheme greatly improve the transportation efficiency of the loose soil stored in the soil storage box, thereby improving the construction efficiency of excavation. This scheme is particularly suitable for the construction of square pile excavation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the internal soil conveying blades of the utility model.

[0012] Figure 2 It is a structural schematic diagram of a drill bit of the utility model.

[0013] Figure 3 It is a structural schematic diagram of the transmission gear set bearing of the utility model.

[0014] Figure 4 It is a schematic diagram of the positional relationship between the output gear and the input gear of the transmission gear set bearing of the utility model.

[0015] Marked in the figure are: drill bit 101, gear 102, planetary gear 103, drill bit center axis 104, center drill rod 105, sun gear 106, soil lifting box 301, soil lifting box hole 305, center drill rod bearing 501, soil storage box 601, soil conveying blade 602, vent 603, transmission gear set bearing 701, output gear 702, input gear 703, transmission gear 704. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings.

[0017] like Figure 1 , Figure 2 , Figure 3 , Figure 4 The rotary drilling rig drill bit structure for square pile excavation shown in the figure comprises a drill bit 101 and a center drill rod 105, wherein the outer contour of the drill bit 101 is a Lello triangle, the axis of the center drill rod 105 is arranged parallel to the drill bit center axis 104 located at the geometric center of the drill bit 101, and the drill bit center axis 104 rotates while performing a circular motion around the axis of the center drill rod 105; the rotary drilling rig drill bit structure comprises a soil lifting box 301 with a square cross section, wherein the center drill rod 105 is arranged in the soil lifting box 301 along the vertical direction, the drill bit 101 is arranged below the soil lifting box 301, and the bottom of the soil lifting box 301 includes a soil lifting box 301 with a square cross section, wherein the center drill rod 105 is arranged in the soil lifting box 301 along the vertical direction, and the drill bit 101 is arranged below the soil lifting box 301. The hole 305 of the soil lifting box is included. The area of ​​the hole dug by the drill bit 101 rotating around the central drill rod 105 is larger than the cross-sectional area of ​​the soil lifting box 301. A cylindrical soil storage box 601 is sleeved in the soil lifting box 301. The central drill rod 105 is arranged in the soil storage box 601. The axis of the soil storage box 601 is arranged colinearly with the central drill rod 105. The central drill rod 105 is spirally provided with soil conveying blades 602. When the soil conveying blades 602 rotate with the central drill rod 105, the soil conveying blades 602 convey the soil at the hole 305 of the soil lifting box upward to the soil lifting box 301. Among them, the bottom surface of the drill bit 101 is evenly provided with gears 102 for digging holes. The gears 102 break the soil into loose soil, so as to facilitate entering the hole 305 of the soil lifting box.

[0018] Since the soil conveying blades 602 are provided and the soil conveying blades 602 are fixedly spirally provided on the central drill rod 105, when the central drill rod 105 rotates, the spiral soil conveying blades 602 also rotate accordingly, thereby continuously conveying the soil at the bottom soil lifting box hole 305 upward and storing it in the soil storage box 601.

[0019] In order to prevent the soil from being unable to be transported into the soil storage box 601 due to excessive gas pressure in the soil storage box 601 during the above-mentioned soil transportation process, the following solution is preferred: at least one vent hole 603 is provided on the side wall of the soil storage box 601, and the vent hole 603 connects the inside of the soil storage box 601 with the outside. After the vent hole 603 is added, when the soil is transported into the soil storage box 601, the gas in the soil storage box 601 can be discharged through the vent hole 603, thereby ensuring that the soil is smoothly stored in the soil storage box 601.

[0020] In actual use, the center drill rod 105 is connected to the drill bit 101 through a transmission gear set. Since there is a gap at the bottom of the transmission gear set, soil may enter and damage the transmission gear set. In order to seal the above gap and ensure that the transmission gear set can be used normally for a long time, a transmission gear set bearing 701 for sealing the bottom of the transmission gear set can be selected at the bottom of the transmission gear set. The transmission gear set bearing 701 includes an input gear 703 arranged at the center, an output gear 702 arranged around the input gear 703, and at least one transmission gear 704. The center drill rod 105 is connected to the input gear 703 of the transmission gear set bearing 701, and the drill bit center shaft 104 is connected to the output gear 702 of the transmission gear set bearing 701.

[0021] In addition, the following solution can be preferred: including a central drill rod bearing 501, which is sleeved on the top of the central drill rod 105 and fixedly arranged on the top of the soil lifting box 301. The central drill rod bearing 501 can ensure that when the central drill rod 105 rotates, the soil lifting box 301 does not rotate with it. At the same time, during the soil lifting process, the weight of the entire soil lifting box is borne by the bearing 501, ensuring the strength requirements for the use of the equipment.

Claims

1. A rotary drilling rig drill bit structure for square pile excavation, comprising a drill bit (101) and a center drill rod (105), wherein the outer contour of the drill bit (101) is a Lello triangle, the axis of the center drill rod (105) is arranged parallel to the drill bit center axis (104) located at the geometric center of the drill bit (101), and the drill bit center axis (104) rotates while performing a circular motion around the axis of the center drill rod (105); comprising a soil lifting box (301) with a square cross section, wherein the center drill rod (105) is arranged in the soil lifting box (301) along the vertical direction, the drill bit (101) is arranged below the soil lifting box (301), and the bottom of the soil lifting box (301) includes a soil lifting box hole (305), and the area of ​​the hole excavated by the drill bit (101) rotating around the center drill rod (105) is larger than the cross-sectional area of ​​the soil lifting box (301), and characterized in that: A cylindrical soil storage box (601) is sleeved in the soil lifting box (301), a central drill rod (105) is arranged in the soil storage box (601), the axis of the soil storage box (601) and the central drill rod (105) are arranged colinearly, and a soil conveying blade (602) is spirally arranged on the central drill rod (105); when the soil conveying blade (602) rotates with the central drill rod (105), the soil conveying blade (602) conveys the soil at the hole (305) of the soil lifting box upward into the soil lifting box (301).

2. The rotary drilling rig drill bit structure for square pile excavation according to claim 1, characterized in that: At least one vent hole (603) is provided on the side wall of the soil storage box (601), and the vent hole (603) connects the inside of the soil storage box (601) with the outside.

3. The rotary drilling rig drill bit structure for square pile excavation according to claim 1 or 2, characterized in that: The central drill rod (105) and the drill bit (101) are connected via a transmission gear set. A transmission gear set bearing (701) for sealing the bottom of the transmission gear set is arranged at the bottom of the transmission gear set. The transmission gear set bearing (701) comprises an input gear (703) arranged at the center, an output gear (702) arranged around the input gear (703), and at least one transmission gear (704). The central drill rod (105) is connected to the input gear (703) of the transmission gear set bearing (701), and the drill bit central shaft (104) is connected to the output gear (702) of the transmission gear set bearing (701).

4. The rotary drilling rig drill bit structure for square pile excavation according to claim 1 or 2, characterized in that: It comprises a central drill rod bearing (501), wherein the central drill rod bearing (501) is sleeved on the top of the central drill rod (105) and fixedly arranged on the top of the soil lifting box (301).

5. The rotary drilling rig drill bit structure for square pile excavation according to claim 1 or 2, characterized in that: The bottom surface of the drill bit (101) is evenly provided with teeth (102) for digging holes.

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