Drilling rig for rotary drilling

Abstract

The present invention discloses a barrel drill for rotary drilling rigs, which comprises a barrel drill body with an opening facing downward, a bottom ring surface of the barrel drill body provided with picks, an arc-shaped notch for water flow entering the inner cavity of the barrel drill body in the region between every two adjacent picks on the bottom ring surface of the barrel drill body, and a drainage hole for water flow flowing out of the inner cavity of the barrel drill body through the side wall of the barrel drill body; a protrusion is formed in the region between every two arc-shaped notches at the bottom end of the side wall of the barrel drill body, and each pick of the barrel drill is fixed on the corresponding protrusion; the inner wall of each protrusion is provided with a streamlined reinforcing rib extending upward from the pick; every two adjacent streamlined reinforcing ribs form a water passage; each water passage corresponds to an arc-shaped notch and a drainage hole, the arc-shaped notch corresponding to the water passage constitutes the inlet of the water passage, and the drainage hole corresponding to the water passage constitutes the outlet of the water passage. The barrel drill can increase the amount of water passing through the bottom of the barrel drill.

Description

Technical Field

[0001] The invention relates to the technical field of pile foundation construction machinery and equipment, in particular to a barrel drill for a rotary drilling rig. Background Art

[0002] Rotary drilling rigs are increasingly widely used in pile foundation construction due to their high efficiency, low noise, no pollution, and wide adaptability to various strata. During the construction process, the rotary drilling rig transmits torque and pressure to the drill bit through the drill rod, and the drill bit, as a key component of the rotary drilling rig, directly determines the energy efficiency of the drilling rig.

[0003] The barrel drill of a traditional rotary drilling rig includes a barrel drill body with an opening facing downward, a plurality of cutting teeth are arranged on the bottom ring surface of the barrel drill body, and a joint for docking a drill rod is arranged on the top plate of the barrel drill body. The working process of the barrel drill is as follows: the drill rod drives the barrel drill body to drill downward, and the cutting teeth on the bottom ring surface of the barrel drill body and the hard weathered bedrock layer are continuously ground and crushed to form an annular groove, and as the drill tool drills downward, the annular groove is continuously deepened, thereby forming a columnar rock core separated from the main body of the rock layer in the barrel drill body; when the length of the columnar rock core reaches a certain value, such as about 1 meter, it will be broken by the inclined surface of the inner wall of the barrel of the barrel drill body, and then the drill rod is pulled out of the borehole to throw out the broken rock core in the barrel drill.

[0004] When the barrel drill is drilling, the picks will continuously grind and crush the rock formation, which will generate a lot of heat; however, the amount of water flowing through the bottom of the barrel drill is small, and the heat dissipation is not timely, which will cause the picks to overheat and be damaged; moreover, the small amount of water flowing through the bottom of the barrel drill will also lead to uneven slag discharge, and the drill slag will be retained at the bottom of the hole, which will cause secondary crushing, waste energy, and increase the loss of the picks; furthermore, when encountering complex strata with weathered bedrock and mud, the small amount of water flowing through the bottom and the small cross-sectional area of ​​the water flow channel will cause the mud to stick to the picks, thereby reducing the crushing efficiency of the picks and further worsening the heat dissipation of the picks, thereby accelerating the wear of the picks. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a barrel drill for a rotary drilling rig which can increase the amount of water flowing through the bottom of the barrel drill.

[0006] The technical solution of the present invention is to provide a barrel drill for a rotary drilling rig, which includes a barrel drill body with an opening downward, a bottom ring surface of the barrel drill body is provided with a cutting tooth, and a top plate of the barrel drill body is provided with a joint for docking a drill rod; an arc-shaped notch is provided in the area between every two adjacent cutting teeth on the bottom ring surface of the barrel drill body for water to flow into the inner cavity of the barrel drill body, and a drainage hole is also penetrated through the side wall of the barrel drill body for water to flow out of the inner cavity of the barrel drill body; the drainage holes of the barrel drill body are the same in number and correspond to the arc-shaped notches; a protrusion is formed in the area between every two arc-shaped notches at the bottom end of the side wall of the barrel drill body, and each cutting tooth of the barrel drill is fixed on the corresponding protrusion; the inner wall of each protrusion is provided with a streamlined reinforcement rib extending upward from the cutting tooth; every two adjacent streamlined reinforcement ribs form a water passage; each water passage corresponds to an arc-shaped notch and a drainage hole, the arc-shaped notch corresponding to the water passage constitutes the inlet of the water passage, and the drainage hole corresponding to the water passage constitutes the outlet of the water passage.

[0007] Compared with the prior art, the barrel drill for the rotary drilling rig adopting the above structure has the following advantages:

[0008] Firstly, since an arc-shaped notch is provided at the bottom end of the drill body and a drainage hole is provided on the side wall, a complete water cycle is constructed, that is, water flows into the drill from the arc-shaped notch at the bottom end of the drill body, passes through the corresponding water passage, and is discharged from the drainage hole; the above-mentioned water cycle increases the amount of water flowing through the bottom end of the drill, naturally greatly improves the heat dissipation of each cutting tooth at the bottom end of the drill, ensures that the heat generated by the grinding of each cutting tooth is taken away by the water flow in time, avoids the aggravated wear of the cutting tooth due to overheating, and guarantees its service life; moreover, the increase in water flow naturally also leads to an increase in the slag carrying capacity, so that the drill cuttings at the bottom end of the drill can be discharged by the water flow in time, thereby avoiding repeated crushing caused by the sinking of the drill cuttings to the bottom, reducing the ineffective wear of the cutting teeth, and saving energy consumption; moreover, the water flow near the cutting teeth is increased. , and the scouring of mud is more violent, making it difficult for mud to adhere, avoiding the embarrassing situation of mud sticking to the cutting teeth when drilling into muddy formations; furthermore, the design of the streamlined reinforcement ribs achieves a dual function, which can not only specifically strengthen the weak area at the bottom of the barrel drill body, that is, the strength and rigidity of the convex protrusion, thereby reducing the probability of wear at this position and extending its service life, but also, the two adjacent streamlined reinforcement ribs construct a water guide groove connecting the arc-shaped notch and the drainage hole, forming a closed loop to continuously guide the water flow, ensuring that the water flow in the inner cavity of the barrel drill body is more stable and orderly, avoiding turbulence, ensuring the flow rate, and thus ensuring the energy efficiency of heat dissipation and slag carrying; in addition, the one-to-one corresponding drainage holes and arc-shaped notches make the inlet and outlet of each circulating water path clear, the path is stable, and there are few interference factors.

[0009] The arc-shaped notches are preferably shaped such that the midline of the width of each arc-shaped notch is inclined along the axial direction of the cutting tooth; the two side surfaces of each arc-shaped notch are inclined toward the direction of the water flow passing through the arc-shaped notch; the inclination of the midline of the width of the arc-shaped notch can ensure that when the drill bit rotates for drilling, the channel area of ​​the notch is large enough and the amount of water passing through is sufficient; and the left and right side surfaces of the arc-shaped notch do not extend radially but along the direction of the water flow passing through the arc-shaped notch, which is also to ensure that when the drill bit rotates, the two side surfaces form a streamline shape that is close to or even consistent with the direction of the water flow, thereby reducing the resistance of the water flow passing through the arc-shaped notch and increasing the water flow speed.

[0010] As a benefit, a short reinforcing rib is provided in the area obliquely below each drainage hole on the outer surface of the side wall of the drill body. When the drill body is drilling, the short reinforcing rib pushes the water discharged from the drainage hole obliquely upward. In this way, firstly, the weak link of the drill body, that is, the strength of the opening position, can be strengthened in a targeted manner; secondly, when the drill body rotates, the short reinforcing rib generates an oblique upward thrust, further pushing the water flow and drill cuttings to be discharged upward.

[0011] As a further benefit, an upper portion of the outer surface of the side wall of the barrel drill body is provided with oblique spiral ribs for pushing the water flow in the area obliquely upward when the barrel drill is drilling. The above-mentioned oblique spiral ribs form a group of three, and a plurality of groups of spiral ribs are distributed at intervals on the outer surface of the side wall of the barrel drill body; firstly, when the barrel drill rotates, the above-mentioned oblique spiral ribs can generate an oblique upward thrust to continue to discharge the water flow and drill cuttings in the upper half area outside the barrel drill body; moreover, the above-mentioned oblique spiral ribs are arranged in groups and at intervals, and the intervals between each group effectively avoid space for the lower water flow, that is, the water flow discharged from the drainage hole and pushed upward by the reinforced short ribs to be discharged smoothly; moreover, each group of oblique spiral ribs protrudes outward from the barrel drill body, and can also play a certain wall protection role to prevent the collapse of the borehole wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a barrel drill used for a rotary drilling rig of the present invention.

[0013] Figure 2 yes Figure 1 Schematic diagram of the structure after deflection at a certain angle.

[0014] Figure 3 The utility model is a front view structural schematic diagram of a barrel drill used for a rotary drilling rig of the present invention.

[0015] As shown in the figure: 1. Drill body, 2. Cutting teeth, 3. Drill rod, 4. Joint, 5. Arc notch, 5.1. Side, 6. Drainage hole, 7. Streamline reinforcement ribs, 8. Water passage, 9. Short reinforcement ribs, 10. Oblique spiral ribs, a. Width center line, b. Axis. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1 to Figure 3 As shown, the barrel drill for rotary drilling rig of the present invention comprises a barrel drill body 1 with an opening facing downward, a bottom ring surface of the barrel drill body 1 is provided with a circle of multiple cutting teeth 2, and a top plate of the barrel drill body 1 is provided with a joint 4 for docking a drill rod 3.

[0018] An arc-shaped notch 5 is provided between every two adjacent picks 2 on the bottom annular surface of the drill body 1 for water to flow into the inner cavity of the drill body 1. The above-mentioned area meets two conditions, being located on the bottom annular surface of the drill body 1 and between every two adjacent picks 2. The side wall of the drill body 1 is also penetrated by drainage holes 6 for water to flow out of the inner cavity of the drill body 1. The above-mentioned drainage holes 6 are the same in number as the arc-shaped notches 5 and correspond one to one.

[0019] The area between every two arc-shaped notches 5 at the bottom end of the side wall of the barrel drill body 1 forms a protrusion, that is, the protrusion is located both at the bottom end of the side wall of the barrel drill body 1 and between every two arc-shaped notches 5. Each pick 2 of the barrel drill is fixed on the corresponding protrusion. The inner wall of each protrusion is provided with a streamlined reinforcement rib 7 extending upward from the pick 2; every two adjacent streamlined reinforcement ribs 7 form a water passage 8. Each water passage 8 corresponds to an arc-shaped notch 5 and a drainage hole 6, the arc-shaped notch 5 corresponding to the water passage 8 constitutes the entrance of the water passage 8, and the drainage hole 6 corresponding to the water passage 8 constitutes the outlet of the water passage 8.

[0020] The width midline a of each arc-shaped notch 5 is inclined along the axis b of the pick 2. Both side surfaces 5.1 of each arc-shaped notch 5 are inclined toward the direction of the water flow passing through the arc-shaped notch 5. In other words, when the arc-shaped notch 5 is cut out at the lower part of the drill body 1, it is not cut in a direction perpendicular to the side wall of the drill, but is offset at a certain angle so that the two side surfaces 5.1 of the arc-shaped notch 5 extend along the direction of the water flow passing through the arc-shaped notch 5.

[0021] A reinforcing short rib 9 is provided in the area obliquely below each drainage hole 6 on the outer surface of the side wall of the barrel drill body 1. When the barrel drill is drilling, the reinforcing short rib 9 pushes the water discharged from the drainage hole 6 obliquely upward.

[0022] The upper part of the outer surface of the side wall of the barrel drill body 1 is provided with inclined spiral ribs 10 for pushing the water flow in the area obliquely upward when the barrel drill is drilling. The above-mentioned inclined spiral ribs 10 are grouped into three, and multiple groups of spiral ribs are distributed at intervals on the outer surface of the side wall of the barrel drill body 1.

Claims

1. A drill nut for a rotary drilling rig, comprising a drill nut body with a downward opening, a bottom annular surface of the drill nut body provided with pick teeth, and a top plate of the drill nut body provided with a joint for docking a drill rod; characterized in that: An arc-shaped notch is provided in the area between every two adjacent cutting teeth on the bottom ring surface of the drill body for water to flow into the inner cavity of the drill body, and a drainage hole is also penetrated through the side wall of the drill body for water to flow out from the inner cavity of the drill body; the drainage holes of the drill body are the same in number and correspond one to one; a protrusion is formed in the area between every two arc-shaped notches at the bottom end of the side wall of the drill body, and each cutting tooth of the drill is fixed on the corresponding protrusion; a streamlined reinforcing rib is provided on the inner wall of each protrusion extending upward from the cutting tooth; every two adjacent streamlined reinforcing ribs form a water passage; each water passage corresponds to an arc-shaped notch and a drainage hole, the arc-shaped notch corresponding to the water passage constitutes the inlet of the water passage, and the drainage hole corresponding to the water passage constitutes the outlet of the water passage; the above-mentioned arc-shaped notch, water passage and drainage hole form a complete water circulation.

2. The barrel drill for a rotary drilling rig according to claim 1, characterized in that: The width midline of each arc-shaped notch is inclined along the axis direction of the pick; and the two side surfaces of each arc-shaped notch are inclined toward the direction of the water flow passing through the arc-shaped notch.

3. The barrel drill for a rotary drilling rig according to claim 1, characterized in that: A short reinforcing rib is arranged in the area obliquely below each drainage hole on the outer surface of the side wall of the barrel drill body. When the barrel drill is drilling, the short reinforcing rib pushes the water discharged from the drainage hole obliquely upward.

4. The barrel drill for a rotary drilling rig according to claim 1, characterized in that: The upper part of the outer surface of the side wall of the barrel drill body is provided with oblique spiral ribs for pushing the water flow in the area obliquely upward when the barrel drill is drilling. The above-mentioned oblique spiral ribs form a group of three, and multiple groups of spiral ribs are distributed at intervals on the outer surface of the side wall of the barrel drill body.

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