Rotary cutting bucket tooth drill bit and drilling tool assembly

Abstract

The rotary cutting bucket tooth drill bit comprises a first center shaft, a first spiral blade, a rotary cutting tooth piece and a rotary cutting head, the first center shaft is a tubular shaft and is vertically arranged, a butt joint portion is formed at the opening position of the upper end of the first center shaft, the rotary cutting head is arranged at the end portion of the lower end of the first center shaft, and the first spiral blade is arranged on the rotary cutting tooth piece. The rotary cutting head is provided with a slurry outlet channel communicated with the interior of the first center shaft, the first spiral blade is coaxially arranged on the side wall of the first center shaft in a screwed mode, the rotary cutting tooth piece is vertically and obliquely arranged on the side wall of the first center shaft, and the upper end of the rotary cutting tooth piece is connected with the lower end of the first spiral blade. The lower end of the side wall of the first center shaft is provided with cutting teeth in the tangential direction, in this way, during drilling, the middle of the bottom of a hole is drilled through the selective cutting head, the hole wall can be reamed through the rotary cutting tooth pieces, then slag is discharged upwards through the first spiral blades, and the drilling effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling tools, and particularly relates to a rotary cutting bucket tooth drill bit and a drilling tool assembly. Background Art

[0002] Most of the existing rotary cutting drill bits have multiple cutting teeth arranged at the lower end of the central shaft, and spiral blades arranged on the outer wall of the central shaft, and multiple cutting teeth are also arranged on the lower side of the spiral blades, and the diameter of the rotating track of the outer side of the spiral blades gradually increases from bottom to top, so that the cutting teeth at the lower end of the central shaft can drill into the bottom of the hole, while the spiral blades can expand the hole wall and guide the slag upward. For example, the structures disclosed in the document number CN101798905A "A long spiral pile driver multi-spiral cutter drill bit", the document number CN114753773A "A spiral drill bit with adjustable cutting teeth inclination" or the document number CN2769486Y "Spiral drill bit", when drilling, the lower end of the spiral blade will be severely worn, and the drilling effect is not good. Utility Model Content

[0003] In order to achieve the above objectives, one of the objectives of the utility model is to provide a rotary cutting bucket tooth drill which has a simple structure and can drill into the bottom and wall of the hole and discharge slag in time during drilling.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a rotary cutting bucket tooth drill bit, comprising a first center axis, a first spiral blade, a rotary cutting tooth piece and a rotary cutting head, the first center axis is a tubular axis and is vertically arranged, the open part of the upper end of the first center axis constitutes a docking part, the rotary cutting head is arranged at the end part of the lower end of the first center axis, and the lower end of the first center axis is blocked, and the rotary cutting head has a slurry outlet channel connected to the interior of the first center axis, the first spiral blade is coaxially screwed on the side wall of the first center axis, the rotary cutting tooth piece is vertically inclined on the side wall of the first center axis, and the upper end of the rotary cutting tooth piece is connected to the lower end of the first spiral blade, and the lower end of the side wall of the first center axis is also tangentially arranged with a cutting tooth.

[0005] The beneficial effect of the above technical solution is that when drilling, the cutting head drills the middle of the hole bottom, and the rotary cutting teeth can expand the hole wall, and then the first spiral blade discharges slag upward, and the drilling effect is good.

[0006] The rotary cutting head in the above technical solution includes a cylinder and a plurality of rotary cutting racks. The cylinder is coaxially convexly arranged at the lower end of the first center axis and blocks the lower end of the first center axis. The plurality of rotary cutting racks are radially arranged on the side wall of the cylinder and distributed at intervals along the circumferential direction. The slurry outlet channel is arranged in the cylinder, and its slurry outlet end is located on the side wall of the cylinder, and the rotary cutting racks are all located within the horizontal projection range of the first center axis.

[0007] The beneficial effects of the above technical solution are: its structure is simple, and the drilling effect is good, and the drilling mud can timely cool and lubricate the rotary cutting rack, thereby reducing the wear rate of the rotary cutting rack.

[0008] In the above technical solution, three rotary cutting racks and three pulp outlet channels are provided, and a pulp outlet end of the pulp outlet channel is provided between two adjacent rotary cutting racks.

[0009] The beneficial effects of the above technical solution are: it has good drilling effect and good cooling and lubrication effect.

[0010] In the above technical solution, the horizontal height of the lower end surface of the rotary cutting rack decreases from the outside to the inside in the radial direction, and the ends of the plurality of rotary cutting racks close to each other extend to the lower end of the column and are close to each other.

[0011] The beneficial effect of the above technical solution is that: when the rotary cutting head rotates, its rotation trajectory is in the shape of an inverted cone, and its drilling effect is good.

[0012] In the above technical solution, two of the first spiral blades and the rotary cutting teeth are provided, and the two first spiral blades and the two rotary cutting teeth correspond one to one, and the two first spiral blades and the two rotary cutting teeth are respectively arranged opposite to each other on the outer side wall of the first center axis, and the upper end of each rotary cutting tooth is connected to the lower end of the corresponding first spiral blade.

[0013] The beneficial effect of the above technical solution is that the two rotary cutting teeth can expand the hole wall synchronously, and the two spiral blades can discharge the slag drilled by the corresponding rotary cutting teeth upward in time.

[0014] In the above technical solution, two picks are provided, the two picks are relatively distributed at the lower end of the first central axis, and the two picks are located on both sides between the two rotary cutting teeth.

[0015] The beneficial effect of the above technical solution is that the hole wall can be loosened in advance while the rotary cutting teeth are expanding the hole, thereby improving the drilling efficiency.

[0016] In the above technical solution, the direction of the tooth tip of the cutting tooth is consistent with the rotation direction of the first central axis, and the angle between the lower end of the first spiral blade and the upper end of the rotary cutting tooth piece is an obtuse angle.

[0017] The beneficial effect of the above technical solution is that the pick has a good loosening effect, and the slag drilled out by the rotary cutting tooth piece is promptly guided to the corresponding first spiral blade.

[0018] In the above technical solution, the number of spiral turns of the first spiral blade is 0.5-1 turns.

[0019] The beneficial effect of the above technical solution is that the two first spiral blades and the two first rotary cutting teeth do not interfere with each other.

[0020] The second purpose of the utility model is to provide a drilling tool assembly which has a simple structure and can drill a hole deeply and discharge slag in time.

[0021] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a drilling tool assembly, including a spiral shaft and the rotary cutting bucket tooth drill bit as described above, the spiral shaft having a second center shaft and a second spiral blade coaxially arranged on the outside of the second center shaft, the lower end of the second center shaft is detachably docked with the upper end of the first center shaft, and the upper end of the second center shaft is used to dock with a drilling rig.

[0022] The beneficial effect of the above technical solution is that when the drilling depth is greater than the height of the rotary cutting bucket tooth, a spiral shaft can be installed on it to lengthen it, so that not only the hole can be drilled, but also the spiral shaft can continue to discharge slag upwards.

[0023] In the above technical solution, the upper end of the first center axis is provided with two first pin holes aligned with each other in the radial direction, and the lower end of the second center axis is provided with two second pin holes aligned with each other in the radial direction, and the upper end of the first center axis is inserted into the lower end of the second center axis, and the first pin hole and the second pin hole are aligned and inserted with a pin connector for detachable connection.

[0024] The beneficial effect of the above technical solution is that it makes the docking of the first central axis and the second central axis more convenient and less likely to get loose. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the rotary cutting bucket tooth drill bit described in Example 1 of the utility model;

[0026] Figure 2 This is a bottom view of the rotary cutting bucket tooth drill bit described in Example 1 of the utility model;

[0027] Figure 3It is a schematic diagram of the first spiral blade and the rotary cutting tooth piece in Example 1 of the utility model being deployed on the first central axis;

[0028] Figure 4 This is a schematic diagram of the distribution of the lower end of the first spiral blade and the rotary cutting tooth piece on the first central axis in Example 1 of the utility model;

[0029] Figure 5 It is a cross-sectional view of the column and the first central axis described in Example 1 of the utility model;

[0030] Figure 6 This is a schematic diagram of the docking of the rotary cutting bucket tooth drill bit and the spiral shaft according to Example 2 of the utility model;

[0031] Figure 7 It is a cross-sectional view of the first central axis and the second central axis when they are separated in Embodiment 2 of the present utility model;

[0032] Figure 8 It is a cross-sectional view of the first central axis and the second central axis when they are separated in Example 3 of the utility model;

[0033] Fig. 9 This is a cross-sectional view of the first central axis and the second central axis when they are connected in Example 3 of the utility model.

[0034] In the figure: 1 rotary cutting bucket tooth drill bit; 11 first center axis; 111 first pin hole; 12 first spiral blade; 13 rotary cutting tooth piece; 14 rotary cutting head; 141 cylinder; 1411 slurry outlet channel; 142 rotary cutting rack; 15 pick; 2 spiral axis; 21 second center axis; 211 second pin hole; 22 second spiral blade; 3 pin connection; 31 first cylinder; 32 second cylinder; 33 inner hexagonal groove. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0036] Example 1

[0037] like Figure 1 and Figure 2As shown, this embodiment provides a rotary cutting bucket tooth drill, including a first central shaft 11, a first spiral blade 12, a rotary cutting tooth piece 13 and a rotary cutting head 14, wherein the first central shaft 11 is a tubular shaft and is vertically arranged, and the open portion of the upper end of the first central shaft 11 constitutes a docking portion, and the rotary cutting head 14 is arranged at the end of the lower end of the first central shaft 11 and blocks the lower end of the first central shaft 11, and the rotary cutting head 14 has a slurry outlet channel 1411 connected to the inside of the first central shaft 11, and the rotary cutting head 14 is provided with a slurry outlet channel 1411 connected to the inside of the first central shaft 11. The first spiral blade 12 is coaxially screwed on the side wall of the first center axis 11, the rotary cutting tooth piece 13 is vertically inclined on the side wall of the first center axis 11, and the upper end of the rotary cutting tooth piece 13 is connected to the lower end of the first spiral blade 12. The lower end of the side wall of the first center axis 11 is also tangentially provided with a cutting tooth 15. When drilling, the cutting head drills the middle of the bottom of the hole, and the rotary cutting tooth piece can expand the hole wall, and then the first spiral blade is used to discharge slag upward, and the drilling effect is good.

[0038] See Figure 1 , Figure 2 and Figure 5 As shown, the rotary cutting head 14 in the above technical scheme includes a cylinder 141 and a plurality of rotary cutting racks 142, the cylinder 141 is coaxially convexly arranged at the lower end of the first center axis 11, and blocks the lower end of the first center axis 11, and the plurality of rotary cutting racks 142 are radially arranged on the side wall of the cylinder 141 and distributed at intervals along the circumferential direction, the slurry outlet channel 1411 is arranged in the cylinder 141, and its slurry outlet end is located on the side wall of the cylinder 141, and the rotary cutting racks 142 are all located within the horizontal projection range of the first center axis 11, the structure is simple, and the drilling effect is good, and the drilling mud can timely cool and lubricate the rotary cutting racks, thereby reducing the wear rate of the rotary cutting racks.

[0039] Since the main parts for cutting the bottom layer in this embodiment are the rotary cutting teeth and the rotary cutting head, the rotary cutting teeth and the rotary cutting head in this embodiment can be made of hard alloy materials (such as tungsten carbide), and the remaining parts can be made of conventional hard steel.

[0040] In the above technical solution, the rotary cutting racks 142 and the slurry outlet channels 1411 are provided in three, and there is a slurry outlet end of the slurry outlet channel 1411 between two adjacent rotary cutting racks 142, which has good drilling effect and good cooling and lubrication effect. In this embodiment, the other ends of the three slurry outlets 1411 are located in the middle of the upper end of the column and are connected to the inner lower end of the first central axis.

[0041] In this embodiment, the length of the first central axis can be about 20 cm, and the length of the column can be 3-5 cm.

[0042] The lower end of the rotary cutting rack and the outer edge of the rotary cutting rack in this embodiment are both uneven structures (similar to sawtooth), which can also improve its cutting performance on the bottom layer.

[0043] In this embodiment, the rotary cutting tooth piece and the first spiral blade are connected at one end close to each other, and the width of the rotary cutting tooth piece gradually decreases from top to bottom, while the width of the upper end of the rotary cutting blade is consistent with the width of the first spiral blade (see Figure 3 As shown), the inclination of the rotary cutting tooth piece is steeper than that of the first spiral blade, so that the slag cut by the rotary cutting tooth piece is discharged upward to the corresponding first spiral blade under its extrusion, and the slag is discharged upward by the first spiral blade (as shown in detail). Figure 4 As shown, Figure 4 The dashed arrow in the middle indicates the conveying direction of the slag).

[0044] The horizontal height of the lower end surface of the rotary cutting rack 142 in the above technical solution decreases from the outside to the inside in the radial direction (i.e. Figure 1 As described in the figure, the lower end of the rotary cutting rack is an inclined surface), and the ends of the multiple rotary cutting racks 142 that are close to each other extend to the lower end of the column 141 and are close to each other, so that the rotation trajectory of the rotary cutting head is an inverted cone when it rotates, and the drilling effect is good.

[0045] Preferably, the lower end of the rotary cutting tooth piece is flush with the lower end of the first central axis, and the outer side of the rotary cutting tooth piece is slightly arc-shaped (see Figure 3 ).

[0046] In the above technical solution, the first spiral blade 12 and the rotary cutting tooth piece 13 are each provided with two pieces, and the two first spiral blades 12 and the two rotary cutting tooth pieces 13 correspond one to one, and the two first spiral blades 12 and the two rotary cutting tooth pieces 13 are respectively arranged opposite to each other on the outer wall of the first central axis 11, and the upper end of each rotary cutting tooth piece 13 is connected to the lower end of the corresponding first spiral blade 12, so that the two rotary cutting tooth pieces can expand the hole wall synchronously, and the two spiral blades can discharge the slag drilled by the corresponding rotary cutting tooth piece upward in time. Each rotary cutting tooth piece can be regarded as a structure in which the lower end of the first spiral blade is bent downward and gradually reduced in diameter, but the hardness of the two materials is different (see Figure 4 and Figure 5 shown).

[0047] In the above technical solution, two picks 15 are provided, and the two picks 15 are relatively distributed at the lower end of the first center axis 11, and the two picks 15 are located on both sides between the two rotary cutting teeth 13. In this way, the hole wall can be loosened in advance while the rotary cutting teeth are expanding the hole, thereby improving the drilling efficiency.

[0048] In the above technical solution, the direction of the tooth tip of the pick 15 is consistent with the rotation direction of the first center axis 11, and the angle between the lower end of the first spiral blade 12 and the upper end of the rotary cutting tooth piece 13 is an obtuse angle, so that the pick has a good soil loosening effect, and the slag drilled out by the rotary cutting tooth piece is promptly diverted to the corresponding first spiral blade.

[0049] In the above technical solution, the number of spiral turns of the first spiral blade 12 is 0.5-1 turns (that is, the first spiral blade is preferably spiraled for more than half a turn, and the projection of the two first spiral blades on the horizontal plane can form a circle), so that the two first spiral blades and the two first rotary cutting teeth do not interfere with each other.

[0050] Example 2

[0051] like Figure 6 As shown, this embodiment provides a drilling tool assembly, including a spiral shaft 2 and a rotary cutting bucket tooth drill bit 1 as described in Example 1, wherein the spiral shaft 2 has a second center shaft 21 and a second spiral blade 22 coaxially arranged on the outside of the second center shaft 21, the lower end of the second center shaft 21 is detachably docked with the upper end of the first center shaft 11, and the upper end of the second center shaft 21 is used to dock with a drilling rig, so that when the drilling depth is greater than the height of the rotary cutting bucket tooth, a spiral shaft can be installed above it to lengthen it, so that not only can the hole be drilled, but also the spiral shaft can continue to discharge slag upward.

[0052] like Figure 7 As shown, in the above technical solution, the upper end of the first center axis 11 is provided with two first pin holes 111 aligned with each other in the radial direction, and the lower end of the second center axis 21 is provided with two second pin holes 211 aligned with each other in the radial direction, and the upper end of the first center axis is inserted into the lower end of the second center axis, and the first pin hole 111 and the second pin hole 211 are aligned and inserted into the pin connector 3 for detachable connection, so that the docking of the first center axis and the second center axis is more convenient and not easy to loosen.

[0053] In this embodiment, the specifications of the first central axis and the second central axis can be consistent, and the diameter of the circular trajectory of the second spiral blade when the outer periphery rotates is D 2 The diameter of the circular trajectory of the outer periphery of the first spiral blade when rotating is D 1 , where D 2 ≤D 1 , preferably, D 2 <D 1， Specifically, the D 1 Can be 300mm,D 2 It can be 200mm, which can improve the slag discharge efficiency.

[0054] The pin connection member may include a bolt and a nut, and after the two first pin holes and the two second pin holes are aligned, the bolt is passed through and the nut is tightened on the threaded end of the bolt.

[0055] The upper end of the second center shaft has the same structure as the upper end of the first center shaft, and can both be used as a docking female part, while the driving end of the drilling rig has the same structure as the lower end of the second center shaft, and can both be used as a docking male part. At this time, the upper end of the second center shaft and the driving end of the drilling rig can also be connected through a pin connection. Of course, the upper end of the first center shaft can also be directly connected to the driving end of the drilling rig through a pin connection (the setting of the pin connection does not affect the flow of drilling mud inside the first center shaft and the second center shaft). Of course, according to the depth requirements of the hole, the drilling tool assembly of this embodiment can also include multiple spiral shafts, and the multiple spiral shafts are spliced ​​in sequence to increase the length of the drilling tool assembly (such as Figure 6 shown).

[0056] Example 3

[0057] Same as Example 2, except that Figure 8 and Fig. 9 As shown, the pin connector 3 is also provided with two, and the pin connector 3 includes a first cylinder 31 and a second cylinder 32, the second cylinder 32 is coaxially arranged at one end of the first cylinder 31, the outer wall of the first cylinder 31 is provided with an external thread, the end of the first cylinder 31 away from the second cylinder 32 is coaxially provided with an inner hexagonal groove 33 (for inserting an inner hexagonal wrench), the aperture of the second pin hole is larger than the aperture of the first pin hole (and after the first center axis and the second center axis are plugged in, the first pin hole and the corresponding second pin hole are aligned and coaxially distributed), and the inner wall of the second pin hole is provided with a thread that is aligned with the first cylinder 3 1, the two second pin holes are respectively aligned with the corresponding first pin holes, and pass through a pin connector respectively, and the pin connector is threadedly connected to the second pin holes (and the second cylinder 32 extends into the corresponding first pin holes respectively, so that the pin connector can be completely embedded in the first pin hole and the corresponding second pin hole). Further preferably, the first pin hole can be a blind hole, that is, one end thereof close to the first central axis is blocked, so there is no need to worry about the pin connector extending into the first central axis (in this embodiment, the side wall of the second cylinder is a smooth part, which will not generate cutting force on the hole wall of the first pin hole).

[0058] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A rotary cutting bucket tooth drill, characterized in that: The invention comprises a first central axis (11), a first spiral blade (12), a rotary cutting tooth piece (13) and a rotary cutting head (14); the first central axis (11) is a tubular axis and is vertically arranged; the open portion of the upper end of the first central axis (11) constitutes a docking portion; the rotary cutting head (14) is arranged at the end of the lower end of the first central axis (11) and blocks the lower end of the first central axis (11); the rotary cutting head (14) has a pulp outlet channel (1411) connected to the inside of the first central axis (11); the first spiral blade (12) is coaxially screwed on the side wall of the first central axis (11); the rotary cutting tooth piece (13) is vertically inclinedly arranged on the side wall of the first central axis (11); the upper end of the rotary cutting tooth piece (13) is connected to the lower end of the first spiral blade (12); and the lower end of the side wall of the first central axis (11) is also tangentially arranged with a cutting tooth (15).

2. The rotary cutting bucket tooth drill bit according to claim 1, characterized in that: The rotary cutting head (14) comprises a cylinder (141) and a plurality of rotary cutting racks (142); the cylinder (141) is coaxially convexly arranged at the lower end of the first central axis (11) and blocks the lower end of the first central axis (11); the plurality of rotary cutting racks (142) are radially arranged on the side wall of the cylinder (141) and are distributed at intervals along the circumferential direction; the pulp outlet channel (1411) is arranged in the cylinder (141), and its pulp outlet end is located on the side wall of the cylinder (141); and the rotary cutting racks (142) are all located within the horizontal projection range of the first central axis (11).

3. The rotary cutting bucket tooth drill according to claim 2, characterized in that: The rotary cutting racks (142) and the pulp outlet channels (1411) are each provided with three, and a pulp outlet end of the pulp outlet channel (1411) is provided between two adjacent rotary cutting racks (142).

4. The rotary cutting bucket tooth drill bit according to claim 2, characterized in that: The horizontal height of the lower end surface of the rotary cutting rack (142) decreases radially from the outside to the inside, and the ends of the plurality of rotary cutting racks (142) that are close to each other extend to the lower end of the column (141) and are close to each other.

5. The rotary cutting bucket tooth drill bit according to claim 1, characterized in that: The first spiral blade (12) and the rotary cutting tooth piece (13) are each provided with two pieces, and the two first spiral blades (12) and the two rotary cutting tooth pieces (13) correspond to each other one by one, and the two first spiral blades (12) and the two rotary cutting tooth pieces (13) are respectively arranged opposite to each other on the outer side wall of the first central axis (11), and the upper end of each rotary cutting tooth piece (13) is connected to the lower end of the corresponding first spiral blade (12).

6. The rotary cutting bucket tooth drill bit according to claim 5, characterized in that: Two picks (15) are provided, and the two picks (15) are distributed opposite to each other at the lower end of the first central axis (11), and the two picks (15) are located on both sides between the two rotary cutting teeth (13).

7. The rotary cutting bucket tooth drill bit according to claim 6, characterized in that: The direction of the tooth tip of the cutting tooth (15) is consistent with the rotation direction of the first central axis (11), and the angle between the lower end of the first spiral blade (12) and the upper end of the rotary cutting tooth piece (13) is an obtuse angle.

8. The rotary cutting bucket tooth drill bit according to claim 1, characterized in that: The number of spiral turns of the first spiral blade (12) is 0.5-1.

9. A drilling tool assembly, characterized in that: The invention comprises a spiral shaft (2) and a rotary cutting bucket tooth drill bit (1) as claimed in any one of claims 1 to 8, wherein the spiral shaft (2) has a second central shaft (21) and a second spiral blade (22) coaxially arranged on the outside of the second central shaft (21), the lower end of the second central shaft (21) is detachably connected to the upper end of the first central shaft (11), and the upper end of the second central shaft (21) is used for connecting with a drilling rig.

10. The drilling tool assembly according to claim 9, characterized in that: The upper end of the first center shaft (11) is provided with two first pin holes (111) which are aligned with each other in the radial direction, and the lower end of the second center shaft (21) is provided with two second pin holes (211) which are aligned with each other in the radial direction, and the upper end of the first center shaft is inserted into the lower end of the second center shaft, and the first pin hole (111) and the second pin hole (211) are aligned and inserted into the pin connector (3) for detachable connection.

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