Efficient circulating drill bit

Abstract

The utility model relates to the technical field of drilling equipment, in particular to an efficient circulating drill bit which comprises a cylindrical shell. An upper end cover and a lower end cover are arranged at the upper end and the lower end of the inner side face of the cylindrical shell respectively, one or more liquid injection openings are formed in the upper surface of the upper end cover, one or more liquid outlets are formed in the lower surface of the lower end cover, the liquid outlets are connected with the liquid injection openings through flow guide pipes, and the flow guide pipes are arranged in the cylindrical shell. The drill bit can be matched with a reverse circulation drilling machine to achieve efficient drilling operation, meanwhile, a plurality of blade faces capable of breaking rocks are arranged on the lower end face of the drill bit, the rocks can be rapidly broken into small particles through rotary impact, the broken rocks are pulled out of a drill hole along with water flow, and therefore the working efficiency of drilling construction is greatly improved. The liquid injection port is connected with an external liquid feeding pipe, and liquid in the flow guide pipe is finally discharged through the liquid outlet to enter a drill hole and used for taking mud and rock debris away from the drill hole.

Description

Technical Field

[0001] The present application relates to the technical field of drilling equipment, and in particular to a high-efficiency circulating drill bit. Background Art

[0002] Reverse circulation drilling rig is a kind of drilling equipment used in underground engineering. The specific working principle of reverse circulation drilling rig is to use the flushing medium (such as mud or water) to flow from the annular space between the drill bit and the hole wall to the bottom of the hole, carrying the rock cuttings and then returning to the surface through the inner hole of the drill bit. This method is opposite to the traditional positive circulation drilling and can improve the drilling efficiency and sampling rate.

[0003] During the drilling process using a reverse circulation drill, the drill often encounters hard rock layers. Most of the drill bits of existing reverse circulation drills are only suitable for construction in soil and gravel layers. When encountering hard rock layers, the working efficiency of the drill bits of existing reverse circulation drills will be significantly reduced.

[0004] A Chinese patent with authorization announcement number CN217028794U discloses a reverse circulation drill and a reverse circulation drilling rig system for reverse circulation hole-forming grouting piles. The reverse circulation drill includes a cylinder, a partition, a transmission rod, a drilling disc and cutting teeth. An axially through-going flushing liquid channel is formed in the cylinder. The partition is fixed in the cylinder. One end of the transmission rod is fixed to the center position of the partition, and the other end extends outward from the cylinder. The drilling disc is fixed to the end of the cylinder. The drilling disc and the transmission rod are respectively arranged at the two ends of the cylinder. Multiple rows of cutting teeth are arranged on the outer surface of the drilling disc for forward drilling and cutting rock debris. A drilling mud cavity is formed between the cylinder, the drilling disc and the partition. A discharge channel communicating with the drilling mud cavity is formed in the transmission rod. The drilling disc has a slurry suction channel connecting the flushing liquid channel and the drilling mud cavity. The main stress point of the reverse circulation drilling rig system is the pick. The pick is exposed to the outside and is very easy to break when encountering hard rock. In addition, the pick that is completely exposed to the outside wears quickly during use and needs to be replaced frequently, thus affecting the progress of the drilling operation. Utility Model Content

[0005] The present application provides an efficient circulation drill bit, which can cooperate with a reverse circulation drill rig to achieve efficient drilling operations. At the same time, its lower end face is provided with a plurality of working surfaces that can crush rocks. The rocks can be quickly crushed into small particles through rotational impact, and the crushed rocks are drawn out of the borehole along with the water flow. The drilling working surface adopts a blade surface and an alloy grinding head in combination, which not only improves the wear resistance of the alloy grinding head, but also prevents the alloy grinding head from being broken during operation, thereby effectively solving the problems in the background technology.

[0006] To achieve the above-mentioned objectives, the present application provides the following technical solutions: an efficient circulating drill bit, comprising a cylindrical shell; an upper end cover and a lower end cover are respectively provided at the upper and lower ends of the inner side surface of the cylindrical shell, the upper surface of the upper end cover is provided with at least one liquid injection port, and the lower surface of the lower end cover is provided with at least one liquid outlet, the liquid outlet is connected to the liquid injection port through a guide tube, and the guide tube is arranged inside the cylindrical shell.

[0007] A negative pressure pipe is provided in the middle of the upper surface of the cylindrical shell, and the lower end face of the negative pressure pipe is connected to the suction port arranged in the middle of the lower surface of the lower end cover; the outer side surface of the cylindrical shell is evenly distributed with spiral wear-resistant strips, and the lower surface of the cylindrical shell is evenly distributed with multiple rotary digging teeth, and the lower surface of the lower end cover is provided with no less than two L-shaped rotary digging knives.

[0008] The outer side surface of the cylindrical shell is provided with a guide channel along the shell direction, and the guide channel separates the spiral wear-resistant strips. The rotary digging tooth includes a tooth plate welded on the cylindrical shell, and the working end of the tooth plate is provided with a blade surface two, and a plurality of cylindrical alloy grinding heads two are evenly distributed on the blade surface two. A wear-resistant rod is provided on the outer side surface of the tooth plate, and the working end of the L-shaped rotary digging cutter is provided with a blade surface one, and a plurality of cylindrical alloy grinding heads one are arranged on the blade surface one.

[0009] Preferably, the upper surface of the upper end cover is provided with at least one counterweight filling port.

[0010] Preferably, a cylindrical mounting sleeve is installed on the upper end surface of the negative pressure tube, and an inner side surface of the cylindrical mounting sleeve is provided with an internal thread for connecting a hollow drill rod.

[0011] Preferably, a rib is provided between the outer side surface of the negative pressure tube and the upper surface of the upper end cover, and a hoisting hole is provided on the outer side surface of the rib.

[0012] Preferably, welding stress release holes are provided at the contact positions of the negative pressure pipe, the rib plate and the upper end cover.

[0013] Compared with the prior art, the beneficial effects of this application are:

[0014] 1. The efficient circulation drill bit can cooperate with the reverse circulation drill to achieve efficient drilling operations. At the same time, its lower end face is equipped with multiple working surfaces that can crush rocks. The rock can be quickly crushed into small particles through rotation impact. The crushed rock is pumped out of the borehole with the water flow. The use of the blade surface and the alloy grinding head on the drilling working surface not only improves the wear resistance of the alloy grinding head, but also prevents the alloy grinding head from being broken during the operation.

[0015] 2. The injection port is connected to the external liquid delivery pipe, which delivers the flushing liquid into the guide pipe through the injection port. The liquid in the guide pipe is finally discharged into the borehole through the liquid outlet to carry the mud and rock debris away from the borehole;

[0016] 3. The hollow drill rod drives the cylindrical shell to rotate, and the cylindrical shell drives the rotary digging teeth and L-shaped rotary digging cutter to rotate. The high-speed rotating rotary digging teeth and L-shaped rotary digging cutter break the rock into small particles. The spiral wear-resistant strip is made of wear-resistant carbide material and is used to protect the cylindrical shell. The spiral wear-resistant strip can be welded and replaced at any time after being ground flat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of this application;

[0018] Figure 2 This is the main view of this application;

[0019] Figure 3 This is a top view of this application;

[0020] Figure 4 This is a bottom view of this application;

[0021] Figure 5 This is a schematic diagram of the bottom structure of this application;

[0022] Figure 6 It is a schematic diagram of the structure of rotary excavator teeth.

[0023] In the figure: 1 cylindrical mounting sleeve, 2 negative pressure pipe, 3 upper end cover, 4 cylindrical shell, 5 counterweight filling port, 6 liquid filling port, 7 spiral wear-resistant strip, 8 rib plate, 9 welding stress release hole, 10 lifting hole, 11 rotary digging tooth, 111 blade surface two, 112 tooth plate, 113 cylindrical alloy grinding head two, 114 wear-resistant rod, 12 L-type rotary digging cutter, 13 blade surface one, 14 cylindrical alloy grinding head one, 15 liquid outlet, 16 lower end cover, 17 suction port. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In the description of this application, if the orientation description is involved, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the attached Figure 2The orientation or position relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present application. When a feature is referred to as being "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0026] See also Figure 1-6 The present application provides the following technical solutions: an efficient circulation drill bit, comprising a cylindrical shell 4; an upper end cover 3 and a lower end cover 16 are respectively provided at the upper and lower ends of the inner side surface of the cylindrical shell 4, the upper surface of the upper end cover 3 is provided with at least one liquid injection port 6, and the lower surface of the lower end cover 16 is provided with at least one liquid outlet 15, the liquid outlet 15 is connected to the liquid injection port 6 through a guide tube, and the guide tube is arranged inside the cylindrical shell 4.

[0027] Specifically, the injection port 6 is connected to an external liquid delivery pipe, which delivers the flushing liquid into the guide pipe through the injection port 6. The liquid in the guide pipe is finally discharged into the borehole through the liquid outlet 15 to carry mud and rock debris away from the borehole.

[0028] More specifically, the number of the liquid injection ports 6 and the number of the liquid outlets 15 are both two, and the two liquid injection ports 6 and the two liquid outlets 15 are both arranged on both sides of the negative pressure tube 2 .

[0029] A negative pressure pipe 2 is provided in the middle of the upper surface of the cylindrical shell 4, and the lower end surface of the negative pressure pipe 2 is connected to the suction port 17 arranged in the middle of the lower surface of the lower end cover 16; the outer side surface of the cylindrical shell 4 is evenly distributed with spiral wear-resistant strips 7, and the lower surface of the cylindrical shell 4 is evenly distributed with multiple rotary digging teeth 11, and the lower surface of the lower end cover 16 is provided with no less than two L-shaped rotary digging knives 12.

[0030] Specifically, the negative pressure pipe 2 is connected to an external suction pipe, and the flushing water at the bottom of the borehole carries mud and rock debris into the interior of the negative pressure pipe 2 through the suction port 17 .

[0031] More specifically, the hollow drill rod drives the cylindrical shell 4 to rotate, and the cylindrical shell 4 drives the rotary digging teeth 11 and the L-shaped rotary digging cutter 12 to rotate. The high-speed rotating rotary digging teeth 11 and the L-shaped rotary digging cutter 12 crush the rocks into small particles. The spiral wear-resistant strip 7 is made of wear-resistant cemented carbide material and is used to protect the cylindrical shell 4. The spiral wear-resistant strip 7 can be welded and replaced at any time after being ground flat.

[0032] There are four L-shaped rotary digging knives 12, and the four L-shaped rotary digging knives 12 are arranged in a ring to form a cross rotary digging knife.

[0033] The outer side surface of the cylindrical shell 4 is provided with a guide channel along the shell direction, and the guide channel separates the spiral wear-resistant strip 7.

[0034] Specifically, flushing water can be injected downward through the diversion channel, and the flushing water can not only cool the drill bit, but also remove the debris produced during the drilling process from the borehole.

[0035] The rotary excavator tooth 11 comprises a tooth plate 112 welded on a cylindrical shell 4 , a second blade surface 111 is provided at a working end of the tooth plate 112 , a plurality of second cylindrical alloy grinding heads 113 are evenly distributed on the second blade surface 111 , and a wear-resistant rod 114 is provided on the outer side of the tooth plate 112 .

[0036] Specifically, the cylindrical alloy grinding head 113 and the wear-resistant rod 114 are both made of high wear-resistant alloy material. The provision of the cylindrical alloy grinding head 113 and the wear-resistant rod 114 can effectively increase the service life of the rotary excavator tooth 11.

[0037] The working end of the L-shaped rotary cutter 12 is provided with a blade surface 13 , and a plurality of columnar alloy grinding heads 14 are provided on the blade surface 13 .

[0038] Specifically, the provision of the cylindrical alloy grinding head 14 can alleviate the wear of the L-shaped rotary cutter 12 during operation, thereby increasing its service life.

[0039] Furthermore, the upper surface of the upper end cover 3 is provided with at least one counterweight filling port 5 .

[0040] Specifically, when the drill bit is in use, cement or other counterweight materials are poured into the interior of the cylindrical shell 4 through the counterweight filling port 5. After the interior of the cylindrical shell 4 is filled, the counterweight filling port 5 is closed with a steel plate.

[0041] Furthermore, a cylindrical mounting sleeve 1 is installed on the upper end surface of the negative pressure tube 2, and an inner side surface of the cylindrical mounting sleeve 1 is provided with an internal thread for connecting a hollow drill rod.

[0042] Specifically, the columnar mounting sleeve 1 is used for quick connection of the hollow drill rod, and an annular sealing ring is provided at the contact point between the columnar mounting sleeve 1 and the hollow drill rod.

[0043] Furthermore, a rib plate 8 is provided between the outer side surface of the negative pressure tube 2 and the upper surface of the upper end cover 3 , and a hoisting hole 10 is provided on the outer side surface of the rib plate 8 .

[0044] Specifically, the provision of the ribs 8 increases the connection strength of the negative pressure pipe 2, and the provision of the hoisting holes 10 facilitates the overall hoisting of the drill bit.

[0045] Furthermore, welding stress release holes 9 are provided at the contact positions among the negative pressure pipe 2 , the rib plate 8 and the upper end cover 3 .

[0046] Specifically, the provision of the welding stress release holes 9 can effectively reduce welding cracks and deformation, and improve welding quality.

[0047] When in use: connect the negative pressure pipe 2 with the external hollow drill rod, connect the injection port 6 with the external circulating water filling device through a pipeline, and the hollow drill rod drives the cylindrical shell 4 to rotate and applies a certain downward pressure to the cylindrical shell 4. As the cylindrical shell 4 works, circulating water is injected into the bottom of the drill bit through the injection port 6, and the high-speed rotating rotary digging teeth 11 and L-shaped rotary digging cutter 12 break the stones. Synchronously, the mud or rock fragments are pumped upward from the bottom of the wellbore through the negative pressure pipe 2, and the filtered water is sent back to the bottom of the wellbore to form a closed cycle to achieve the purpose of drilling.

[0048] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An efficient circulation drill bit, Features: It comprises a cylindrical shell (4); an upper end cover (3) and a lower end cover (16) are respectively provided at the upper and lower ends of the inner side surface of the cylindrical shell (4); the upper surface of the upper end cover (3) is provided with at least one liquid injection port (6); the lower surface of the lower end cover (16) is provided with at least one liquid outlet (15); the liquid outlet (15) is connected to the liquid injection port (6) via a flow guide pipe; the flow guide pipe is arranged inside the cylindrical shell (4); A negative pressure pipe (2) is provided in the middle of the upper surface of the cylindrical shell (4), and the lower end surface of the negative pressure pipe (2) is connected to a suction port (17) provided in the middle of the lower surface of the lower end cover (16); spiral wear-resistant strips (7) are evenly distributed on the outer side surface of the cylindrical shell (4), a plurality of rotary digging teeth (11) are evenly distributed on the lower surface of the cylindrical shell (4), and no less than two L-shaped rotary digging knives (12) are provided on the lower surface of the lower end cover (16); The outer side surface of the cylindrical shell (4) is provided with a guide channel along the shell direction, the guide channel isolating the spiral wear-resistant strip (7), the rotary excavator tooth (11) comprises a tooth plate (112) welded to the cylindrical shell (4), the working end of the tooth plate (112) is provided with a second blade surface (111), and a plurality of second columnar alloy grinding heads (113) are evenly distributed on the second blade surface (111), and the outer side surface of the tooth plate (112) is provided with a wear-resistant rod (114), and the working end of the L-shaped rotary excavator (12) is provided with a first blade surface (13), and a plurality of first columnar alloy grinding heads (14) are arranged on the first blade surface (13).

2. A highly efficient circulating drill bit according to claim 1, Features: The upper surface of the upper end cover (3) is provided with at least one counterweight filling port (5).

3. An efficient circulation drill according to claim 1, Features: The upper end surface of the negative pressure tube (2) is mounted with a cylindrical mounting sleeve (1), and the inner side surface of the cylindrical mounting sleeve (1) is provided with an internal thread for connecting to a hollow drill rod.

4. A highly efficient circulating drill bit according to claim 1, Features: A rib plate (8) is provided between the outer side surface of the negative pressure pipe (2) and the upper surface of the upper end cover (3), and a hoisting hole (10) is provided on the outer side surface of the rib plate (8).

5. A highly efficient circulating drill bit according to claim 4, Features: A welding stress release hole (9) is provided at the contact position between the negative pressure pipe (2), the rib plate (8) and the upper end cover (3).

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