A high-efficiency drill bit for soft soil drilling

Abstract

The utility model relates to the technical field of drill bit, and disclose a kind of drill bit for soft soil drilling of high efficiency, by connecting portion, drill bit, gauge body, chip flute and center flow passage etc. constitute, and ladder groove is set in the lateral wall of center flow passage, the lateral wall sliding connection of ladder groove has receiving plate, the bottom surface fixed connection of receiving plate has compression spring, the middle part of receiving plate is equipped with through-hole, the bottom surface fixed connection of receiving plate is located in the inside of compression spring and is connected with connecting pipe, the bottom end fixed connection of connecting pipe has baffle, the middle part of baffle is equipped with guide hole.The utility model utilizes the design of receiving plate, connecting pipe and baffle, so that water flow passes through the through-hole on receiving plate and enters the inside of connecting pipe, and the diameter of guide hole on baffle is less than the diameter of through-hole, so that water flow increases pressure after entering the inside of connecting pipe, so that the water flow pressure of water eye is increased, thereby reducing the phenomenon of drill bit mud ball.

Description

Technical Field

[0001] This utility model relates to the field of drill bit technology, and in particular to a high-efficiency drilling bit for soft soil drilling. Background Technology

[0002] Drilling or exploration utilizes deep drilling mechanical engineering technology to extract natural resources from the earth's bottom or seabed, or to obtain geological profiles and physical samples for experiments to obtain relevant data. Due to the different textures of soil, different approaches are required during drilling, especially for soft soil drilling. The purpose of soft soil drilling is to obtain undisturbed soil samples and evaluate engineering geological parameters through low-disturbance processes. The commonly used drilling bit is the diamond alloy drill bit (i.e., PDC drill bit). Diamond alloy drill bits are one-piece drill bits, which have advantages such as high speed and high drilling depth in both soft and hard soil layers.

[0003] However, for drilling in soft soil, due to the high water content in the soil layer, casing drilling is often used during the drilling process to prevent borehole collapse. This involves using a casing to protect the borehole sidewalls. Because drilling in soft soil generates a large amount of mud, and this mud is quite viscous, the drill bit is prone to mud buildup during drilling. This can lead to decreased drilling speed, drill skipping, or even stuck drill bit. If the mud buildup is severe, drilling must be stopped and the drill bit removed from the borehole for mud cleaning, which is time-consuming and labor-intensive. Therefore, a high-efficiency drilling bit for soft soil drilling is proposed. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a high-efficiency drilling bit for soft soil drilling, which has the advantages of reducing mud accumulation on the drill bit and flushing the chip removal groove when mud accumulation occurs, eliminating the need to remove the drill bit from the borehole for cleaning, thus solving the problems mentioned in the background technology.

[0005] This utility model provides the following technical solution: a high-efficiency drilling bit for soft soil drilling, comprising a connecting part and a drill head. The drill head is fixedly connected to the bottom end of the connecting part. Multiple gauge bodies for drilling are fixedly connected to the outer surface of the drill head. A chip removal groove for discharging mud inside the borehole is formed between each pair of adjacent gauge bodies. Several diamond alloy cutting teeth for cutting soil and rock are fixedly connected to each gauge body by an embedding method. A central flow channel for water transmission is opened in the middle of the inner side of the connecting part. A water cavity for holding water is opened inside the drill head. A water eye for water discharge is opened at the bottom of the drill head. A water pressure boosting device for increasing water pressure is provided inside the central flow channel. A flushing device for rinsing mud packs and an anti-backflow device for preventing mud and water from flowing back into the drill head are provided inside the drill head.

[0006] Preferably, the water flow boosting device includes a stepped groove, which is formed on the side wall of the central flow channel. A receiving plate for receiving water flow is slidably connected to the side wall of the stepped groove. A compression spring for moving and resetting the receiving plate is fixedly connected to the bottom surface of the receiving plate. A through hole for water flow is formed in the middle of the receiving plate.

[0007] Preferably, the bottom surface of the receiving plate is fixedly connected to a connecting pipe for water flow protection inside the compression spring, and the bottom end of the connecting pipe is fixedly connected to a baffle for blocking water flow. The baffle has a guide hole in the middle for limiting the water flow velocity.

[0008] Preferably, the flushing device includes a connecting hole, which is opened inside the drill bit. A conduit for transmitting water flow is fixedly connected to the outer surface of the drill bit at a position corresponding to the connecting hole. A drain head for discharging water flow is fixedly connected to the end of the conduit away from the drill bit. A drain hole for increasing the flow direction of water flow is opened on the side wall of the drain head. The conduit and the drain head are located inside the chip removal groove.

[0009] Preferably, the bottom end of the compression spring is a movable end that is not fixed to any structure. In the initial state, the connecting tube blocks the location of the connecting hole, and the diameter of the through hole is larger than the diameter of the guide hole.

[0010] Preferably, a water flow channel is formed between the receiving plate, the connecting pipe and the baffle, and the water flows in through the through hole and finally out through the guide hole. The side wall of the baffle is in sliding contact with the inner side wall of the central flow channel.

[0011] Preferably, the anti-backflow device includes a stop that can be reset after being moved.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model, through the design of stepped grooves, receiving plates, compression springs, connecting pipes, and baffles, allows water to flow into the central channel of the drill bit during normal drilling to reduce drilling difficulty and accelerate drill bit cooling. The water flows out through water holes and acts on the soil inside the borehole, while simultaneously cooling the drill bit. The design of the receiving plate, connecting pipe, and baffles allows water to flow through the through holes on the receiving plate into the connecting pipe. The diameter of the guide hole on the baffle is smaller than the diameter of the through hole, which increases the pressure of the water flowing into the connecting pipe. This increases the pressure of the water flowing out of the water holes, thereby reducing the occurrence of mud buildup on the drill bit.

[0013] 2. This utility model, through the design of connecting holes, conduits, drainage heads, and drain holes, addresses the issue of mud buildup during drilling. When mud buildup occurs, the obstructed drainage at the water inlet causes an increase in water pressure within the water cavity. This increased pressure pushes the baffle upwards, causing the baffle and connecting pipe to move away from the connecting hole, exposing it. Some water from the water cavity is then discharged through the connecting hole and further processed by the conduit, drainage head, and drain holes, ultimately acting on the mud buildup in the chip removal groove to flush it out. This eliminates the need to remove the drill bit from the borehole for cleaning when mud buildup occurs, improving the efficiency of borehole drilling. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the bottom structure of the drill head of this utility model; Figure 3 This is a schematic diagram of the internal structure of the water cavity of this utility model; Figure 4 This is a schematic diagram of the stepped groove structure of this utility model; Figure 5 This is a schematic diagram of the internal structure of the catheter of this utility model; Figure 6 This is an exploded structural diagram of the receiving plate, connecting pipe, and baffle of this utility model.

[0015] In the diagram: 1. Connecting part; 2. Drill head; 21. Connecting hole; 22. Guide tube; 23. Drain head; 24. Drain hole; 25. Spring; 26. Plug; 3. Dimension retainer; 4. Chip removal groove; 5. Diamond alloy cutting teeth; 6. Central flow channel; 61. Stepped groove; 62. Support plate; 63. Compression spring; 64. Through hole; 65. Connecting pipe; 66. Baffle; 67. Guide hole; 7. Water cavity; 8. Water eye. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-6A high-efficiency drilling bit for soft soil drilling includes a connecting part 1 and a drill head 2. The drill head 2 is fixedly connected to the bottom end of the connecting part 1, and the connecting part 1 and the drill head 2 are integrally formed. The outer surface of the connecting part 1 is provided with fastening threads for fixing. The connecting part 1 is fixed to the drill rod (the drill rod is a mature prior art and is not shown in this application) by the fastening threads. Multiple gauge bodies 3 for drilling are fixedly connected to the outer surface of the drill head 2. A chip removal groove 4 for discharging mud inside the borehole is formed between each two adjacent gauge bodies 3. Several diamond alloy cutting teeth 5 for cutting soil and rock are fixedly connected to each gauge body 3 by an embedding method. The inner side of the connecting part 1 is... The drill bit 2 has a central channel 6 for water flow transmission, a water cavity 7 for water collection, and a water outlet 8 for water discharge at the bottom. The water cavity 7 connects the central channel 6 and the water outlet 8. During normal use, a water pump is used to pump water into the central channel 6. The water flows through the water cavity 7 and is finally discharged through the water outlet 8, allowing the mud inside the tunnel to be discharged through the chip removal groove 4. The water flow is also used to cool the drill bit 2 and the diamond alloy cutting teeth 5. The central channel 6 is equipped with a water flow booster device to increase the water flow pressure. The drill bit 2 is equipped with a flushing device for rinsing the mud pack and an anti-backflow device to prevent mud and water from flowing back into the drill bit 2.

[0018] Please see Figure 4 and Figure 6 The water flow booster device includes a stepped groove 61, which is opened on the side wall of the central flow channel 6. A receiving plate 62 for receiving water flow is slidably connected to the side wall of the stepped groove 61. A compression spring 63 for moving and resetting the receiving plate 62 is fixedly connected to the bottom surface of the receiving plate 62. When the drill bit 2 is in normal use, the water flow entering the central flow channel 6 pushes the receiving plate 62 to move downward against the potential energy of the compression spring 63. A through hole 64 for water flow is opened in the middle of the receiving plate 62.

[0019] Please see Figure 4 and Figure 6 The bottom surface of the receiving plate 62 is fixedly connected to the inner side of the compression spring 63 with a connecting pipe 65 for water flow protection. The bottom end of the connecting pipe 65 is fixedly connected to a baffle 66 for blocking water flow. The middle part of the baffle 66 has a guide hole 67 for limiting the water flow velocity, ensuring that the water flows into the connecting pipe 65 through the through hole 64. The diameter of the guide hole 67 is smaller than the diameter of the through hole 64, which increases the pressure of the water flow.

[0020] Please see Figures 3-5The flushing device includes a connecting hole 21, which is located inside the drill head 2. A conduit 22 for transmitting water flow is fixedly connected to the outer surface of the drill head 2 at a position corresponding to the connecting hole 21. A drain head 23 for discharging water flow is fixedly connected to the end of the conduit 22 away from the drill head 2. A drain hole 24 for increasing the flow direction of water flow is opened on the side wall of the drain head 23. When mud appears in the drill head 2, the water flow in the water cavity 7 is not smooth, which increases the water pressure inside the water cavity 7. At this time, the water pressure pushes the baffle 66 to move, so that the connecting hole 21 is connected to the central flow channel 6. In order to relieve pressure, the water in the water cavity 7 will be transmitted through the connecting hole 21 and the conduit 22, and finally discharged through the drain head 23 and the drain hole 24.

[0021] Please see Figure 5 The backflow prevention device includes a spring 25, which is fixedly connected to the bottom of the inner cavity of the drain head 23. The end of the spring 25 away from the bottom surface of the drain head 23 is fixedly connected to a stopper 26 for blocking the connection between the conduit 22 and the drain head 23. The spring 25 is used to support the stopper 26 and cause the stopper 26 to reset after it moves.

[0022] Please see Figure 4 and Figure 6 The bottom end of the compression spring 63 is a movable end that is not fixed to any structure. In the initial state, the connecting pipe 65 blocks the location of the connecting hole 21. The diameter of the through hole 64 is larger than the diameter of the guide hole 67, so that the water pressure increases by the change in the diameter of the hole after the water flows into the connecting pipe 65.

[0023] Please see Figure 4 and Figure 6 A water flow channel is formed between the receiving plate 62, the connecting pipe 65, and the baffle 66. The water flows through the through hole 64 and finally exits through the guide hole 67. The side wall of the baffle 66 slides in contact with the inner side wall of the central flow channel 6, ensuring that the baffle 66 can move upward after being subjected to the internal pressure of the water cavity 7, and move upward with the connecting pipe 65, so that the connecting hole 21 blocked by the connecting pipe 65 is exposed in the central flow channel 6, and the pressurized water flows out through the connecting hole 21.

[0024] Please see Figure 4 The connecting hole 21 connects the central flow channel 6 to the conduit 22. The bottom opening of the conduit 22 corresponds to the position of the chip discharge groove 4. The conduit 22 and the drain head 23 are located inside the chip discharge groove 4, ensuring that the water flows out through the conduit 22 and acts on the mud bag at the chip discharge groove 4, thereby flushing and cleaning the mud bag.

[0025] Please see Figure 5The sidewall of the plug 26 slides in contact with the inner wall of the conduit 22. When the spring 25 is in the initial state, the plug 26 is located inside the conduit 22. The water pressure discharged through the conduit 22 causes the plug 26 to move against the elastic potential energy of the spring 25, thereby opening the connection channel between the conduit 22 and the drain head 23. When the drill head 2 is running normally, the potential energy of the spring 25 causes the plug 26 to be inside the conduit 22 and to block the conduit 22, so that the mud on the outside of the drill head 2 cannot flow back into the drill head 2.

[0026] Working principle: When drilling is required, the connecting part 1 is fixed to the drill rod by tightening the threads. Then, the drilling equipment (the drilling equipment is a mature existing technology and is not shown in the corresponding figure in this application) is turned on. The drill rod drives the connecting part 1 and the drill head 2 to rotate for drilling. As the drill head 2 continues to drill, the diamond alloy cutting teeth 5 cut the soil and rock. Then, the water pump (the water pump is a mature existing technology and is not shown in the corresponding figure in this application) pumps water into the interior of the central flow channel 6. The water flows through the central flow channel 6 and the water chamber 7 and is finally discharged through the water eye 8. The mud formed by the water flow is discharged through the chip removal groove 4. At the same time, the water flow also cools the drill head 2. Meanwhile, after the water flows into the connecting pipe 65 through the through hole 64, the diameter of the guide hole 67 is smaller than the diameter of the through hole 64. This increases the pressure of the water flow after it is discharged through the guide hole 67. Due to the increase in water pressure, the phenomenon of mud packing on the drill head 2 is reduced. 2. During normal operation, the potential energy of the spring 25 will lift the stopper 26, keeping the stopper 26 inside the guide tube 22, thus sealing the guide tube 22 and preventing mud from flowing back into the drill bit 2. Secondly, when the drill bit 2 encounters mud bag phenomenon, since the mud bag is mainly caused by the high viscosity of the mud, the chip removal groove 4 is not smooth. The unsmooth chip removal will increase the water pressure inside the water chamber 7. The water pressure will push the baffle 66 to move upward, so that the baffle 66, along with the connecting pipe 65 and the receiving plate 62, will move upward. As the connecting pipe 65 moves, the connecting hole 21 will be exposed and connected to the central flow channel 6. At this time, the water will be transmitted through the connecting hole 21 and the guide tube 22 and finally discharged through the drain hole 24 on the drain head 23. Since the drain head 23 corresponds to the chip removal groove 4, the water flow after being discharged through the drain head 23 will directly act on the mud bag at the chip removal groove 4, thereby flushing the mud bag. There is no need to take the drill bit 2 out of the exploratory hole for cleaning, which improves the drilling efficiency.

Claims

1. A high-efficiency drilling bit for soft soil drilling, comprising a connecting part (1) and a drill head (2), wherein the drill head (2) is fixedly connected to the bottom end of the connecting part (1), characterized in that: The outer surface of the drill bit (2) is fixedly connected with a plurality of gauge bodies (3) for drilling. A chip discharge groove (4) for discharging mud inside the burrow is formed between each two adjacent gauge bodies (3). Each gauge body (3) is fixedly connected with a plurality of diamond alloy cutting teeth (5) for cutting soil and rock by an embedding method. A central flow channel (6) for water flow transmission is opened in the middle of the inner side of the connecting part (1). A water cavity (7) for holding water is opened inside the drill bit (2). A water eye (8) for water flow discharge is opened at the bottom of the drill bit (2). A water flow booster device for increasing water flow pressure is provided inside the central flow channel (6). A flushing device for rinsing mud packs and an anti-backflow device for preventing mud and water from flowing back into the drill bit (2) are provided inside the drill bit (2). The water flow booster device includes a stepped groove (61), which is opened on the side wall of the central flow channel (6). The side wall of the stepped groove (61) is slidably connected to a receiving plate (62) for receiving water flow. The bottom surface of the receiving plate (62) is fixedly connected to a compression spring (63) for moving and resetting the receiving plate (62). The middle part of the receiving plate (62) is provided with a through hole (64) for water flow to pass through. The bottom surface of the receiving plate (62) is fixedly connected to the inner side of the compression spring (63) with a connecting pipe (65) for water flow protection. The bottom end of the connecting pipe (65) is fixedly connected to a baffle (66) for blocking water flow. The baffle (66) has a guide hole (67) in the middle for limiting the water flow velocity.

2. The high-efficiency drilling bit for soft soil drilling according to claim 1, characterized in that: The flushing device includes a connecting hole (21) which is located inside the drill head (2). A conduit (22) for transmitting water flow is fixedly connected to the outer surface of the drill head (2) at the location corresponding to the connecting hole (21). A drain head (23) for discharging water flow is fixedly connected to one end of the conduit (22) away from the drill head (2). A drain hole (24) for increasing the flow direction of water flow is provided on the side wall of the drain head (23). The conduit (22) and the drain head (23) are located inside the chip removal groove (4).

3. The high-efficiency drilling bit for soft soil drilling according to claim 2, characterized in that: The bottom end of the compression spring (63) is a movable end that is not fixed to any structure. In the initial state, the connecting tube (65) blocks the location of the connecting hole (21), and the diameter of the through hole (64) is larger than the diameter of the guide hole (67).

4. The high-efficiency drilling bit for soft soil drilling according to claim 1, characterized in that: A water flow channel is formed between the receiving plate (62), the connecting pipe (65) and the baffle (66). The water flows through the through hole (64) and finally exits through the guide hole (67). The side wall of the baffle (66) slides in contact with the inner side wall of the central flow channel (6).

5. The high-efficiency drilling bit for soft soil drilling according to claim 1, characterized in that: The backflow prevention device includes a repositionable stopper (26) that can be moved, and the stopper (26) is slidably connected to the conduit (22).

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