Spiral drill bit
By setting up three sets of cutting teeth groups at the drill head and setting up core cutting teeth and water outlet holes at the drill head, the coreless drilling bit has problems such as large drilling resistance and slow drilling speed during the drilling process, and efficient drilling and chip removal effects are achieved.
Patent Information
- Application Number
- CN202421591648.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-08
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-08
AI Technical Summary
During the drilling process, existing coreless drill bits have problems such as high drilling resistance, slow drilling speed, easy cracking at the connection between the drill rod and the drill bit, and inconvenient disassembly.
Designing a spiral drill bit, including setting up three sets of cutting teeth groups at the drill bit crown, aligning along a predetermined curve, and setting up core cutting teeth and water outlet holes at the drill bit pole, to improve chip exhaust effect and drilling efficiency through spiral structure and high-pressure water flow.
Through the combination of the inverted conical hole bottom structure and high-pressure water flow, the drilling efficiency and chip removal effect are improved, the drill bit replacement frequency is reduced, and the installation and disassembly of the drill bit and drill rod are simplified.
Smart Images
Figure CN222746031U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drilling bits, in particular to a spiral drill bit. Background Art
[0002] During geological drilling, it is necessary to install a drilling bit at the end of the drill rod, and drive the drill bit to rotate around the axis through the drill rod to achieve the purpose of drilling. Most drill bits used for small-diameter geological surveys are coreless drill bits. At present, coreless drill bits have basically the same setting height of each cutting tooth, and are full-face drilling when drilling. When drilling, each cutting edge is stressed at the same time, which will cause problems such as large drilling resistance and slow drilling speed. In addition, due to the large torque transmitted between the drill rod and the drill bit, when the drill rod transmits power to the drill bit, there is a huge torque at the connection between the end of the drill rod and the drill bit, which is easy to cause the connection between the end of the drill rod and the drill bit to break. In addition, when the drill rod and the drill bit are threaded, the huge torque transmitted between the drill rod and the drill bit easily makes the drill bit and the drill rod thread connection position tightly connected under the action of the huge torque, which is not easy to remove quickly when the drill bit is disassembled and replaced. Utility Model Content
[0003] The purpose of the utility model is to solve the above problems and provide a spiral drill bit, which is used to at least partially solve the technical problems existing in the coreless drill bit in the prior art.
[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is to provide a spiral drill bit, including a drill bit shank and a drill bit crown that are integrally arranged, and also including:
[0005] The cutting tooth group comprises three groups evenly spaced around the axis of the drill bit shank, each group of the cutting tooth group comprises two cutting teeth, the two cutting teeth are spaced along a predetermined curve, and along the axial direction, the distance from the cutting tooth close to the axis of the drill bit shank to the drill bit shank is greater than the distance from the other cutting tooth to the drill bit shank, and one end of the predetermined curve starts from the axis of the drill bit shank;
[0006] The core cutting teeth include two core cutting teeth arranged on opposite sides of the drill bit shank in the axial direction, and the cutting edges of the two core cutting teeth are arranged opposite to each other;
[0007] The water outlet hole is arranged on a side of the drill crown away from the drill stem.
[0008] Specifically, the present application arranges three groups of cutting teeth on the crown of the drill bit, and arranges the cutting teeth along a predetermined curve, and arranges a cutting tooth near the center of the crown of the drill bit higher than another cutting tooth. When in use, the spiral drill bit is driven by the drill rod to move in a direction opposite to the bending direction of the predetermined curve, and the end of the predetermined curve away from the axis is bent downstream in the rotation direction of the drill bit. Through this arrangement, when drilling, an inverted cone structure can be drilled at the bottom of the hole, and the core can be cut by two core cutting teeth. The cutting tooth group protrudes from the crown of the drill bit and is arranged as a spiral structure, thereby improving the chip removal effect, and at the same time discharging high-pressure water through the water outlet hole. The high-pressure water can be discharged upward from the bottom of the hole, so that the debris can be discharged in time, reducing the amount of debris deposited at the bottom of the hole, thereby improving the drilling efficiency.
[0009] Furthermore, the water outlet is arranged in the central area of the drill crown.
[0010] Specifically, the water outlet hole is set in the central area of the drill bit crown, and high-pressure water can flow out from the center to the outside along the gaps between the three groups of cutting teeth, so as to better discharge the debris and ensure the drilling efficiency. At the same time, it can better dissipate heat and cool the core cutting teeth and the cutting tooth group, which can extend the service life of the cutting tooth group and the core cutting teeth, reduce the replacement frequency of the drill bit, and further improve the drilling efficiency.
[0011] Furthermore, at least one set of gauge-protecting teeth is provided on the side of the drill crown.
[0012] Specifically, by providing at least one set of diameter-protecting teeth, it can be ensured that the drill bit does not shrink in diameter during the drilling process, thereby ensuring the quality of the drilled hole.
[0013] Furthermore, the paths of the midpoints of the cutting teeth included in the three groups of cutting teeth rotating around the axis of the drill bit shaft do not overlap with each other.
[0014] Specifically, through this setting method, the cutting paths of the three groups of cutting teeth can cooperate with each other during drilling, and the cutting paths of each cutting tooth will not completely overlap, ensuring that there are no blind spots in cutting, so that each cutting tooth can play an efficient cutting role, thereby improving drilling efficiency.
[0015] Furthermore, a plug-in hole is coaxially arranged on the end face of the drill bit rod away from the drill bit crown, and at least one plug-in key is arranged in the side wall of the plug-in hole. An external thread is arranged on the end of the drill bit rod away from the drill bit crown, and a plug-in column which is plug-matched with the plug-in hole is coaxially arranged on the end of the drill rod, and an annular limiting plate is arranged at the connection between the plug-in column and the drill rod, and a sliding sleeve on the drill rod is provided with a threaded sleeve which is threadedly connected to the external thread, and the threaded sleeve is limitedly matched with the annular limiting plate.
[0016] Specifically, through this arrangement, the plug-in housing of the drill rod can be plugged into the plug-in hole of the drill bit rod, and the transmission is carried out by cooperating with the plug-in keyway arranged outside the plug-in housing and the plug-in key, and then the drill rod and the drill bit are connected by threading the threaded sleeve on the periphery of the drill bit rod, and when the drill rod drives the drill bit to work, the transmission is carried out through the plug-in key and the keyway, and at the same time, the drill bit rod is strengthened by wrapping the threaded sleeve around the periphery of the drill bit rod, thereby improving the strength of the drill bit rod, thereby reducing the probability of damage to the drill bit rod, and in this way, it is convenient to install and disassemble the drill bit and drill rod.
[0017] Furthermore, along the axial direction, the distance from one side of the annular limiting plate close to the plug-in column to the plug-in end face is L, and the depth of the plug-in hole is H, then L=H.
[0018] Specifically, through this arrangement, when the drill bit is inserted into the insertion hole, it can be locked by the threaded sleeve, and can be abutted against the bottom of the insertion hole. The end of the drill bit rod can abut against the annular plate, so that the axial force can be fully transmitted, the axial force can be dispersed, and the damage caused by concentrated force can be reduced, thereby improving the service life.
[0019] Furthermore, the drill rod is provided with a sliding sleeve for sliding sealing, the threaded sleeve is connected to the sliding sleeve, and the sliding sleeve comprises a mating surface for sealingly abutting against a surface of the annular limiting plate away from the plug-in column.
[0020] Specifically, by setting a sliding sleeve, the sliding sleeve and the drill rod sliding seal cooperate, after the threaded sleeve is threadedly connected to the drill bit rod, the mating surface abuts against the annular limit plate to form a sealing fit, thereby preventing external water and sand and gravel debris from entering the interior of the plug-in hole.
[0021] Furthermore, the drill rod, the annular limiting plate and the plug-in column are integrally formed.
[0022] Specifically, the one-piece molding arrangement not only improves the overall structural strength of the drill pipe, but also facilitates processing and manufacturing.
[0023] Compared with the prior art, the fully automatic film strapping machine disclosed by the utility model has the following beneficial effects: by arranging three groups of cutting tooth groups on the crown of the drill bit, and arranging the cutting tooth groups along a predetermined curve, and arranging a cutting tooth close to the center position of the crown of the drill bit higher than another cutting tooth, when in use, the spiral drill bit is driven by the drill rod to move in a direction opposite to the bending direction of the predetermined curve, and the end of the predetermined curve away from the axis is bent toward the downstream of the rotation direction of the drill bit. Through this arrangement, when drilling, an inverted cone structure can be drilled at the bottom of the hole, and the core can be cut by two core cutting teeth. The cutting tooth group protrudes from the crown of the drill bit and is arranged in a spiral structure, thereby improving the chip removal effect, and at the same time discharging high-pressure water through the water outlet hole, the high-pressure water can be discharged upward from the bottom of the hole, so that the debris can be discharged in time, and the amount of debris deposited at the bottom of the hole is reduced, thereby improving the drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 The utility model is a schematic diagram of a spiral drill bit.
[0025] Figure 2 The utility model provides a schematic diagram of the top view of the crown of a spiral drill bit.
[0026] Figure 3 The utility model provides a structural schematic diagram of a spiral drill bit connected to a drill rod.
[0027] Figure 4 The utility model provides a partial cross-sectional structural schematic diagram of a spiral drill bit rod portion.
[0028] Figure 5 The utility model provides a structural schematic diagram of a drill rod connected with a spiral drill bit.
[0029] In the figure: 1. drill bit rod; 10. plug-in hole; 11. plug-in key; 12. external thread; 2. drill bit crown; 2a. resection part; 3. cutting tooth group; 31. cutting tooth; 32. predetermined curve; 4. core cutting tooth; 41. fluid channel; 5. water outlet hole; 6. gauge tooth group; 7. drill rod; 71. plug-in column; 710. plug-in groove; 72. annular limit plate; 73. water delivery channel; 8. threaded sleeve; 81. sliding sleeve; 9. drill bit rotation direction. DETAILED DESCRIPTION
[0030] The utility model is now described in further detail in conjunction with the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.
[0031] Embodiment 1
[0032] The utility model provides a spiral drill bit, as a specific implementation method, referring to Figure 1 , Figure 2 , which includes a drill bit shank 1 and a drill bit crown 2 that are integrally arranged, and also includes:
[0033] The cutting teeth group 3 includes three groups evenly spaced around the axis of the drill bit shank, each group of the cutting teeth 3 includes two cutting teeth 31, the two cutting teeth 31 are spaced along a predetermined curve, and along the axial direction, the distance from the cutting teeth 31 close to the axis of the drill bit shank 1 to the drill bit shank 1 is greater than the distance from the other cutting teeth 31 to the drill bit shank 1, and one end of the predetermined curve starts from the axis of the drill bit shank;
[0034] The core cutting teeth 4 include two core cutting teeth 4 disposed on opposite sides of the drill bit shank in the axial direction, and the cutting edges of the two core cutting teeth 4 are disposed opposite to each other;
[0035] The water outlet hole 5 is arranged on a side of the drill crown 2 away from the drill shaft 1 .
[0036] Specifically, it should be noted that reference Figure 1 The drill bit shank and the drill bit crown 2 are formed in one piece by No. 45 steel, wherein the drill bit crown is a conical structure. Figure 4 A fluid channel 41 connected to the water outlet 5 is provided in the drill bit rod, and the fluid channel 41 is connected to the water delivery channel 73 in the drill rod, so that high-pressure water flow is pumped by an external water pump. Figure 1A cutting portion 2a is cut out on the drill crown 2, so that the cutting debris can be removed in time through the cutting portion. The top of the drill crown is cut to form an airfoil tool holder extending in the direction of a predetermined curve 32. Two cutting teeth are set on the airfoil tool holder to form a cutting tooth group 3. As a specific implementation, the cutting teeth use 1308PDC petroleum chips, and the core cutting teeth 4 use 1305PDC high-performance teeth. The present application provides three groups of cutting tooth groups 3 on the drill crown 2, and arranges the cutting tooth groups along a predetermined curve, and sets a cutting tooth 31 near the center of the drill crown higher than another cutting tooth. When in use, the spiral drill bit is driven by the drill rod 7 to move in a direction opposite to the bending direction of the predetermined curve 32, and the predetermined curve One end of the line away from the axis is bent toward the downstream of the drill bit rotation direction 9. Through this arrangement, when drilling, an inverted cone structure can be drilled at the bottom of the hole, and the core can be cut by two core cutting teeth 4. The cutting tooth group protrudes from the crown of the drill bit and is arranged as a spiral structure, so as to improve the chip removal effect, and at the same time discharge high-pressure water through the water outlet 5. The high-pressure water can be discharged upward from the bottom of the hole, so that the debris can be discharged in time, and the amount of debris deposited at the bottom of the hole can be reduced, thereby improving the drilling efficiency. The drill bit is not designed with side water holes, but only two 12 mm straight water holes are designed at the bottom of the drill bit. Since there is no side water hole water pump pressure increase, this not only more effectively cools the cutting teeth, but also more effectively discharges the bottom of the well out of the well, preventing the bottom of the well from settling.
[0037] Specifically, in actual use, along the axial direction, the three cutting tooth groups 3 are equidistant from the drill bit shank 1 , and the axial spacing between the two cutting teeth of each cutting tooth group 3 is 2 mm to 8 mm, preferably 2 mm to 4 mm.
[0038] Further, as a specific implementation, the negative cutting angle of each cutting tooth 31 is 9°, which can greatly increase the self-sharpening performance of the cutting tooth, thereby improving the drilling efficiency.
[0039] Further, as a specific implementation method, refer to Figure 1 , Figure 2 The water outlet is arranged in the central area of the drill crown 2.
[0040] Specifically, the water outlet hole is set in the central area of the drill crown 2, and high-pressure water can flow out from the center to the outside along the gaps between the three groups of cutting tooth groups 3, so that the debris can be better discharged to ensure the drilling efficiency, and at the same time, the core cutting teeth 4 and the cutting tooth group 3 can be better dissipated and cooled, which can extend the service life of the cutting tooth group 3 and the core cutting teeth 4, reduce the replacement frequency of the drill bit, and further improve the drilling efficiency.
[0041] Further, as a specific implementation method, refer to Figure 1At least one set of gauge teeth 6 is also provided on the side of the drill crown 2 .
[0042] Specifically, three circular holes with a diameter of 14 mm and a depth of 4.5 mm are drilled on the side of the drill crown, and three 1304PDC teeth are welded in the holes to form a gauge tooth group 6. By setting the gauge tooth group, the drill bit is not easy to shrink in diameter, thereby ensuring the quality of drilling. In specific implementation, two or three groups of gauge tooth groups 6 can be set at intervals on the side of the drill crown according to specific usage conditions.
[0043] Further, as a preferred embodiment, the paths of the midpoints of the cutting teeth included in the three groups of cutting tooth groups 3 rotating around the axis of the drill bit shaft do not overlap with each other.
[0044] Specifically, the paths of the midpoints of the cutting teeth included in the three groups of cutting tooth groups 3 rotating around the axis of the drill bit shaft do not overlap with each other, which can be understood as the three groups of cutting tooth groups 3 including 6 cutting teeth, and the distances from the center positions of the six cutting teeth to the drill bit axis are not equal. Through this arrangement, the cutting paths of the three groups of cutting tooth groups 3 can cooperate with each other during drilling, and the cutting paths of each cutting tooth will not completely overlap, ensuring that there are no blind spots in cutting, so that each cutting tooth can play an efficient cutting role, thereby improving the drilling efficiency.
[0045] Specifically, through the above-mentioned setting method, according to statistics, the spiral drill bit provided by this application is highly efficient in drilling silhouettes and breaking the bottom layer during construction, and the comprehensive feed speed is more than twice that of an ordinary coreless drill bit. In particular, the hard and complete formation is more than three times that of an ordinary drill bit. The lifespan is more than five times that of an ordinary drill bit.
[0046] Embodiment 2
[0047] The utility model provides a spiral drill bit, as a specific implementation method, referring to Figure 3-Figure 5 Furthermore, the difference between this embodiment and the first embodiment lies in that a plug hole 10 is coaxially arranged on the end face of the drill bit shank 1 away from the drill bit crown 2, at least one plug key 11 is arranged in the side wall of the plug hole, an external thread 12 is arranged on the end of the drill bit shank 1 away from the drill bit crown 2, a plug column 71 which is plugged into the plug hole 10 is coaxially arranged on the end of the drill rod 7, an annular limiting plate 72 is arranged at the connection between the plug column and the drill rod 7, a threaded sleeve 8 which is threadedly connected to the external thread 12 is slidably sleeved on the drill rod 7, and the threaded sleeve 8 is limitedly matched with the annular limiting plate 72.
[0048] Specifically, through this arrangement, the plug-in hole 10 of the drill rod 7 can be plugged into the plug-in hole 10 of the drill bit rod, and the plug-in keyway set by the plug-in column cooperates with the plug-in key 11 for transmission, and then the drill rod and the drill bit are connected by threading the threaded sleeve 8 on the periphery of the drill bit rod. When the drill rod drives the drill bit to work, the transmission is carried out through the plug-in key and the keyway, and at the same time, the drill bit rod is strengthened by wrapping the threaded sleeve 8 around the periphery of the drill bit rod, thereby improving the strength of the drill bit rod, thereby reducing the probability of damage to the drill bit rod, and in this way, it is convenient to install and disassemble the drill bit and drill rod.
[0049] Specifically, as a preferred embodiment, a plurality of plug keys 11 are evenly spaced on the side wall of the plug hole 10, and a plurality of plug grooves 710 are cooperatively arranged on the outer peripheral surface of the plug column. The plug-in transmission cooperation of the plurality of plug keys and the plug grooves can improve the uniformity of the transmitted torque, make the transmission force more dispersed, reduce local stress, and improve the service life.
[0050] Further, as a preferred embodiment, along the axial direction, the distance from one side of the annular limiting plate 72 close to the plug-in column 71 to the plug-in end face is L1, and the depth of the plug-in hole 10 is H, then L1=H.
[0051] Specifically, through this arrangement, when the drill bit is inserted into the insertion hole, it can be locked by the threaded sleeve 8, and can be inserted into the bottom of the insertion hole, and the end of the drill bit rod can be against the annular limit plate 72, so that the axial force can be fully transmitted, the axial force can be dispersed, and the damage caused by concentrated force can be reduced, thereby improving the service life.
[0052] Further, as a specific implementation method, refer to Figure 3-Figure 4 The drill rod 7 is provided with a sliding sleeve 81 for sliding sealing, the threaded sleeve 8 is connected to the sliding sleeve 81 , and the sliding sleeve 81 includes a mating surface that abuts and seals against a side of the annular limiting plate 72 away from the plug-in column 71 .
[0053] Specifically, by setting a sliding sleeve 81, the sliding sleeve and the drill rod sliding seal cooperate, after the threaded sleeve is threadedly connected to the drill bit rod 1, the mating surface (that is, the side opposite to the plug-in column) abuts against the annular limit plate 72 to form a sealing fit, thereby preventing external water and sand and gravel debris from entering the plug-in hole 10.
[0054] Furthermore, as a specific implementation, the drill rod, the annular limiting plate 72 and the plug-in column 71 are integrally formed.
[0055] Specifically, the one-piece molding arrangement not only improves the overall structural strength of the drill pipe, but also facilitates processing and manufacturing.
[0056] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.
Claims
1. A spiral drill bit, comprising a drill bit shank and a drill bit crown that are integrally arranged, characterized in that: Also includes: The cutting tooth group comprises three groups evenly spaced around the axis of the drill bit shank, each group of the cutting tooth group comprises two cutting teeth, the two cutting teeth are spaced along a predetermined curve, and along the axial direction, the distance from the cutting tooth close to the axis of the drill bit shank to the drill bit shank is greater than the distance from the other cutting tooth to the drill bit shank, and one end of the predetermined curve starts from the axis of the drill bit shank; The core cutting teeth include two core cutting teeth arranged on both sides of the axis of the drill bit shaft, and the cutting edges of the two core cutting teeth are arranged opposite to each other; The water outlet hole is arranged on a side of the drill crown away from the drill stem.
2. A spiral drill bit according to claim 1, characterized in that: The water outlet is arranged in the central area of the drill crown.
3. A spiral drill bit according to claim 2, characterized in that: At least one set of gauge-protecting teeth is also arranged on the side of the drill crown.
4. A spiral drill bit according to claim 3, characterized in that: The paths along which the midpoints of the cutting teeth included in the three groups of cutting teeth rotate around the axis of the drill bit shaft do not overlap with each other.
5. A spiral drill bit according to any one of claims 1 to 4, characterized in that: A plug-in hole is coaxially arranged at one end of the drill bit rod away from the drill bit crown, and at least one plug-in key is arranged in the side wall of the plug-in hole. An external thread is arranged at one end of the drill bit rod away from the drill bit crown, and a plug-in column which is plug-matched with the plug-in hole is coaxially arranged at the end of the drill rod, an annular limiting plate is arranged at the connection between the plug-in column and the drill rod, and a sliding sleeve on the drill rod is provided with a threaded sleeve connected with the external thread, and the threaded sleeve is limitedly matched with the annular limiting plate.
6. A spiral drill bit according to claim 5, characterized in that: Along the axial direction, the distance from one side of the annular limiting plate close to the plug-in column to the end face of the plug-in column is L, and the depth of the plug-in hole is H, then L=H.
7. A spiral drill bit according to claim 6, characterized in that: The drill rod is provided with a sliding sleeve for sliding sealing, the threaded sleeve is connected to the sliding sleeve, and the sliding sleeve comprises a matching surface for sealingly abutting against a surface of the annular limiting plate away from the plug-in column.
8. A spiral drill bit according to claim 7, characterized in that: The drill rod, the annular limiting plate and the plug-in column are integrally formed.