A compound rotary wing reamer bit and method of use

Abstract

The application discloses a composite rotary wing type expanding diameter drill bit and a use method thereof, which comprises a drill rod composed of a core rod, a joint, a medium injection channel, a nozzle and a spiral blade, a center seat fixed at the end of the drill rod, a rotary wing shell composed of a first cutter seat and a first cutter head, a center cutter head and a side cutter head; the rotary wing shell is rotatably installed on the center seat through a first pin shaft, the rotary wing shell is provided with adjustable first limiting devices, the center seat is provided with adjustable stop devices, the rotary wing shell is further provided with a follow-up ear seat, a rotary wing B composed of a second cutter seat and a second cutter head is rotatably installed on the follow-up ear seat through a second pin shaft, the follow-up ear seat is provided with adjustable stop devices B, and the rotary wing B is provided with adjustable limiting devices B; the rotary wing B can synchronously rotate with the rotary wing shell, and the rotary wing B can also independently rotate relative to the rotary wing shell. The application has the advantages of simple structure, no need of special external force driving, large expanding diameter ratio, reliable operation, low manufacturing cost and wide application range.

Description

Technical Field

[0001] This invention relates to the technical field of equipment and methods for use in pile foundation construction in building engineering, and more specifically, to a composite rotary wing enlarging drill bit and its method of use. Background Technology

[0002] Pile foundation construction generally involves the drilling rig's power head driving the drill rod and drill bit to drill a hole in the ground. Then, according to the construction design requirements, either concrete is poured into the hole to form a pile, or precast piles are implanted, etc. During the drilling process of pile foundation construction, the drill bit is one of the key components. The structure and function of the drill bit directly affect the efficiency and quality of construction. Especially for some high-tech pile foundation constructions, such as enlarged-base piles and intermediate-drilling pilot-hole piles, the drill bit needs to be able to automatically enlarge the drilling diameter based on the original drilling diameter. The structure and function of such enlarged-diameter drill bits directly affect the success or failure of the construction.

[0003] Currently, there is a technical solution for enlarging drill bits in this technical field (such as utility model 200520077017.3): This solution utilizes rotatable enlarging blades mounted on fixed blades to enlarge the borehole diameter. The advantage of this solution is that it does not require a specific external force drive system; the enlarging drill bit can complete its expansion and closure actions simply by rotating in both directions. However, this solution has problems and shortcomings: the enlarging ratio D / d is relatively small, generally D / d ≤ 1.5; where D is the maximum borehole diameter after the enlarging rotor is fully expanded by rotation, and d is the minimum borehole diameter after the enlarging rotor is fully closed by rotation. The enlarging ratio D / d of the enlarging drill bit is related to the diameter of the fixed blades and the structural dimensions of the drill rod end. When the diameter of the fixed blades is small, the enlarging ratio D / d is also relatively small. Therefore, this solution is not applicable in actual construction where an enlarging ratio D / d > 1.5 to 2.0 is required (such as small-diameter enlarged-base piles, precast pile implantation in mid-drilling pilot holes, etc.).

[0004] Currently, there is another type of drill bit in this technical field that uses a hydraulic cylinder to drive the expansion blade to unfold. It can achieve a large expansion ratio, but it has two problems: ① The drive system for delivering hydraulic oil to the end of the drill rod has a complex structure, is difficult to manufacture, and has a high cost; ② The structure of the hydraulic cylinder-driven expansion blade occupies a large space and is not suitable for expanding small-diameter pile holes.

[0005] In summary, how to solve the above-mentioned technical problems is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a composite rotary wing reamer bit and its method of use, which has a simple structure, does not require a specific external force drive system, has a large expansion ratio, is reliable in operation, is easy to manufacture and has low cost, and is suitable for various hole diameters.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A composite rotary wing type expanding drill bit includes: a drill rod consisting of a core rod, a connector, a media injection channel, a nozzle, and helical blades; a center seat fixedly mounted at the end of the drill rod; a rotary wing armor consisting of a first cutter holder and a first cutter head; a center cutter head and a side cutter head; the rotary wing armor is rotatably mounted on the center seat via a first pin; the rotary wing armor is provided with an adjustable first limiting device A; the center seat is provided with an adjustable stop device A; the stop device A is used to cooperate with the first limiting device A for limiting; characterized in that the rotary wing armor is further provided with a follower lug; a rotary wing B consisting of a second cutter holder and a second cutter head is rotatably mounted on the follower lug via a second pin; the follower lug is provided with an adjustable stop device B; the rotary wing B is provided with an adjustable limiting device B; the limiting device B is used to cooperate with the stop device B for limiting; the rotary wing B can rotate synchronously with the rotary wing armor; the rotary wing B can also rotate independently relative to the rotary wing armor.

[0009] Optionally, the follower ear is provided with an adjustable second limiting device A, which is used to cooperate with the stop device A for limiting.

[0010] A method of using a composite rotary wing reamer, applicable to any of the above-mentioned composite rotary wing reamers, the method of use including a closing method and an unfolding method;

[0011] The closing method of the composite rotary wing reamer includes:

[0012] The composite rotary wing enlarging drill bit is driven by the drill rod through the drill head connected to the joint to rotate clockwise in the K direction and drill a preset amount in the M direction. Under the action of earth pressure resistance, the rotary wing A and the rotary wing B automatically rotate counterclockwise in the N direction to the closed state. At this time, the diameter of the composite rotary wing enlarging drill bit is at its minimum.

[0013] The deployment method of the composite rotary wing type expanding drill bit includes:

[0014] The composite rotary wing type enlarging drill bit is driven by the drill rod through the drill head connected to the joint to rotate counterclockwise in the P direction and drill a preset amount in the M direction. Under the action of earth pressure resistance, the rotary wing armor and the follower lug together rotate clockwise in the S direction with the first pin as the axis. When the first limiting device A on the rotary wing armor contacts the stop device A on the center seat, the clockwise rotation of the rotary wing armor and the follower lug in the S direction stops, and the rotary wing armor is fully deployed.

[0015] Continue driving the composite rotary wing reamer to rotate counterclockwise in direction P and drill a preset amount in direction M. Under the action of earth pressure resistance, the rotary wing B continues to rotate clockwise in direction S relative to the rotary wing A with the second pin as the axis. When the limiting device B on the rotary wing B contacts the stop device B on the follower lug, the clockwise rotation of the rotary wing B in direction S stops, and the rotary wing B completes its deployment. At this point, both the rotary wing A and the rotary wing B are in a fully deployed state, and the composite rotary wing reamer is in the maximum diameter expansion state.

[0016] The composite rotary wing reamer and its application method provided by this invention have the following positive effects and advantages:

[0017] 1. According to the present invention, since the expanding drill bit is composed of a composite rotating blade of rotating blade A and rotating blade B, the expanding ratio is large and can reach D / d≥2.0.

[0018] 2. According to the present invention, the opening and closing action of the composite rotary wing type expanding drill bit is realized by the forward and reverse rotation of the composite rotary wing type expanding drill bit, which does not require a specific external force drive system, has a simple structure, reliable operation, is easy to manufacture, and has low cost.

[0019] 3. According to the present invention, due to the structural features of the composite rotor, not only large-diameter holes but also small-diameter holes can achieve large-diameter expansion operations, which has wide applicability.

[0020] 4. According to the present invention, the operation method of the composite rotary wing type expanding drill bit is simple and convenient, and the construction operation efficiency is high. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a front view of a fully deployed composite rotary wing reamer drill bit provided in a specific embodiment of the present invention;

[0023] Figure 2 yes Figure 1 The image shows a side view of the fully deployed composite rotary wing expanding drill bit.

[0024] Figure 3 yes Figure 1 The diagram shows a fully enclosed front view of the compound rotary wing reamer.

[0025] Figure 4 yes Figure 3 The image shows a side view of the fully closed compound rotary wing enlarging drill bit.

[0026] Figure 5 yes Figure 1 The diagram shows a cross-sectional view (AA) of the fully deployed composite rotary wing reamer drill bit.

[0027] Figure 6 yes Figure 3 The CC cross-section of the composite rotary wing reamer in its fully closed state is shown.

[0028] Figure 7 yes Figure 1 A BB cross-sectional view of the fully deployed state of the compound rotary wing reamer drill bit shown.

[0029] Figure 8 yes Figure 3 The diagram shows a DD cross-sectional view of the fully closed state of the composite rotary wing reamer drill bit.

[0030] Figures 1 to 8 The accompanying figure labels are as follows:

[0031] 1a is the core rod, 1b is the connector, 1c is the medium injection channel, 1d is the nozzle, 1e is the helical blade, 1 is the drill rod, 2 is the center seat, 3a is the first cutter holder, 3b is the first cutter head, 3 is the rotating wing A, 4 is the center cutter head, 5 is the side cutter head, 6 is the first pin, 7 is the first limiting device A, 10 is the follower lug, 11a is the second cutter holder, 11b is the second cutter head, 11 is the rotating wing B, 12 is the second pin, 13 is the stop device A, 14 is the second limiting device A, 15 is the stop device B, and 16 is the limiting device B. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: A composite rotary wing type reamer drill bit.

[0034] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 .

[0035] A composite rotary wing type expanding drill bit includes: a drill rod 1 consisting of a core rod 1a, a connector 1b, a medium injection channel 1c, a nozzle 1d, and a helical blade 1e; a center seat 2 fixedly mounted at the end of the drill rod 1; a rotary wing 3 consisting of a cutter holder 3a and a cutter head 3b; a center cutter head 4; and a side cutter head 5. The rotary wing 3 is rotatably mounted on the center seat 2 via a first pin 6, and an adjustable limiting device A 7 is provided on the rotary wing 3. An adjustable stop device A 13 is provided on the center seat 2, and the stop device A 13 is used to cooperate with the first limiting device A 7 for limiting.

[0036] More importantly, the composite rotary wing type expanding drill bit also includes a rotary wing B 11 composed of a tool holder 11a and a tool head 11b. A follower lug 10 is also provided on the rotary wing A 3. The rotary wing B 11 is rotatably mounted on the follower lug 10 by means of a second pin 12. The rotary wing B 11 can rotate synchronously with the rotary wing A 3, and the rotary wing B 11 can also rotate independently relative to the rotary wing A 3. An adjustable stop device B 15 is provided on the follower lug 10, and an adjustable limit device B 16 is provided on the rotary wing B 11. The limit device B 16 is used to cooperate with the stop device B 15 for limiting.

[0037] As can be seen, since the composite rotary blade enlarging drill bit provided in this embodiment is composed of a composite rotary blade A and a rotary blade B, the enlarging ratio is large, reaching D / d≥2.0, which can meet the construction needs of small-diameter enlarged bottom piles, mid-drilling pilot hole implantation of precast piles and other constructions that require a large enlarging ratio.

[0038] Furthermore, the structural features of the composite rotor formed by rotor A and rotor B allow for diameter expansion operations with large expansion ratios not only with large-diameter holes but also with small-diameter holes, making it widely applicable.

[0039] Furthermore, the structure of the composite rotary wing reamer in this embodiment allows its opening and closing to be achieved by its forward and reverse rotation, eliminating the need for a specific external drive system. Compared to reamers driven by hydraulic cylinders, the composite rotary wing reamer in this embodiment has a simpler structure, more reliable operation, is easier to manufacture, and has lower costs. Moreover, the composite rotary wing reamer is simple and convenient to use, resulting in high construction efficiency.

[0040] Example 2: A composite rotary wing type expanding drill bit.

[0041] Based on Embodiment 1, an adjustable second limiting device A14 is provided on the follower ear seat 10. The second limiting device A14 is used to cooperate with the stop device A13 for limiting.

[0042] It can be seen that by adding a second limiting device A14 and using the stop device A13 to stop and limit the second limiting device A14, the stability of the follower ear seat 10 can be ensured.

[0043] Example 3: A method for using a composite rotary wing type expanding drill bit.

[0044] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 .

[0045] The method of using this composite rotary wing reamer is as follows:

[0046] 1. Closure method of compound rotary wing type expanding drill bit:

[0047] The drilling rig power head connected to joint 1b drives the composite rotary wing enlarging drill bit to rotate clockwise in the K direction via drill rod 1, and drill a preset amount in the M direction. Under the action of earth pressure resistance, both rotary wing A 3 and rotary wing B 11 automatically rotate counterclockwise in the N direction to the closed state. At this time, the diameter of the composite rotary wing enlarging drill bit is at its minimum (e.g., Figure 3 , Figure 4 , Figure 6 and Figure 8 (As shown).

[0048] 2. Deployment method of compound rotary wing type expanding drill bit:

[0049] The drilling rig power head connected to the joint 1b drives the composite rotary wing type expanding drill bit to rotate counterclockwise in the P direction via the drill rod 1, and drills a preset amount in the M direction. Under the action of earth pressure resistance, the rotary wing armor 3 and the follower lug 10 rotate clockwise in the S direction with the first pin 6 as the axis. When the first limiting device A7 on the rotary wing armor 3 contacts the stop device A13 on the center seat 2, the clockwise rotation of the rotary wing armor 3 and the follower lug 10 in the S direction stops, and the rotary wing armor 3 completes its deployment.

[0050] Continue driving the composite rotary wing reamer to rotate counterclockwise in the P direction and drill a preset amount in the M direction. Under the action of earth pressure resistance, the rotary wing B11 continues to rotate clockwise in the S direction relative to the rotary wing A3 with the second pin 12 as the axis. When the limiting device B16 on the rotary wing B11 contacts the stop device B15 on the follower lug 10, the clockwise rotation of the rotary wing B11 in the S direction stops, and the rotary wing B11 is fully deployed. At this point, both the rotary wing A3 and the rotary wing B11 are fully deployed, and the composite rotary wing reamer is in the maximum diameter expansion state (e.g., Figure 1 , Figure 2 , Figure 5 and Figure 7 (As shown).

[0051] It should be noted that, in this embodiment, K is the direction of clockwise rotation of the composite rotary wing enlarging drill bit, P is the direction of counterclockwise rotation of the composite rotary wing enlarging drill bit; S is the direction of clockwise rotation of rotary wing A 3 and rotary wing B 11, N is the direction of counterclockwise rotation of rotary wing A 3 and rotary wing B 11; and M is the direction of drilling into the ground by the composite rotary wing enlarging drill bit.

[0052] It can be seen that the closing and unfolding actions of the composite rotary wing enlarging drill bit are both achieved by the forward and reverse rotation of the composite rotary wing enlarging drill bit, without the need for a specific external force drive system. The operation method is simple and convenient, and the construction efficiency is high. Moreover, when both rotary wings A and B are unfolded, the maximum diameter of the composite rotary wing enlarging drill bit is larger, and it has a large enlarging ratio that can reach D / d≥2.0. This can meet the construction needs of small-diameter enlarged bottom piles, and the construction of precast piles in mid-drilling pilot holes, which have high requirements for the enlarging ratio. It can achieve large enlarging ratio operations not only for large-diameter holes but also for small-diameter holes, and has wide applicability.

[0053] The present invention has been described in conjunction with the above embodiments. However, by making some appropriate changes and adjustments to the component structure, combination method, and usage steps of the composite rotary wing enlarging drill bit, different types of enlarging drill bits can be derived within the scope of the present invention, which can be widely used in pile foundation construction of various projects.

[0054] It should also be noted that, in this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0056] The composite rotary wing reamer drill bit and its usage method provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A composite rotary wing type expanding drill bit, comprising: A drill rod (1) consisting of a core rod (1a), a connector (1b), a medium injection channel (1c), a nozzle (1d), and a spiral blade (1e) is fixedly mounted on a center seat (2) at the end of the drill rod (1). A rotating wing armor (3) consisting of a first cutter holder (3a) and a first cutter head (3b), a center cutter head (4), and a side cutter head (5) are also present. The rotating wing armor (3) is rotatably mounted on the center seat (2) via a first pin (6). An adjustable first limiting device A (7) is provided on the rotating wing armor (3), and an adjustable stop device A (13) is provided on the center seat (2). The stop device A (13) is used to cooperate with the first limiting device A (7) for limiting. When the first limiting device A (7) contacts the stop device A (13), the rotation of the rotating wing armor (3) stops, and the rotating wing armor (3) completes its deployment. The rotating wing armor (3) is characterized by having a follower ear seat (10) on it. The rotating wing B (11), which is composed of a second cutter seat (11a) and a second cutter head (11b), is rotatably mounted on the follower ear seat (10) by means of a second pin (12). The follower ear seat (10) is provided with an adjustable stop device B (15). The rotating wing B (11) is provided with an adjustable limit device B (16). The limit device B (16) is used to cooperate with the stop device B (15) to limit the rotation. When the limit device B (16) contacts the stop device B (15), the rotation of the rotating wing B (11) stops and the rotating wing B (11) is fully deployed. The rotating wing B (11) can rotate synchronously with the rotating wing armor (3) and the rotating wing B (11) can also rotate independently relative to the rotating wing armor (3).

2. The composite rotary wing type expanding drill bit according to claim 1, characterized in that, An adjustable second limiting device A (14) is provided on the follower ear seat (10). The second limiting device A (14) is used to cooperate with the stop device A (13) for limiting. When the second limiting device A (14) contacts the stop device A (13), the rotation of the follower ear seat (10) and the rotating wing armor (3) stops, and the follower ear seat (10) and the rotating wing armor (3) are deployed.

3. A method of using a composite rotary wing type expanding drill bit, characterized in that, The method of using the composite rotary wing expanding drill bit as described in claim 1 or 2 includes a closing method and an unfolding method. The closing method of the composite rotary wing reamer includes: Using the drilling rig power head connected to the joint (1b), the composite rotary wing type expanding drill bit is driven to rotate clockwise in the K direction and drill a preset amount in the M direction through the drill rod (1). Under the action of earth pressure resistance, the rotary wing A (3) and the rotary wing B (11) are automatically rotated counterclockwise in the N direction to the closed state. At this time, the diameter of the composite rotary wing type expanding drill bit is the smallest. The deployment method of the composite rotary wing type expanding drill bit includes: Using the drilling rig power head connected to the joint (1b), the composite rotary wing type expanding drill bit is driven to rotate counterclockwise in the P direction and drill a preset amount in the M direction through the drill rod (1). Under the action of earth pressure resistance, the rotary wing armor (3) and the follower ear seat (10) rotate clockwise in the S direction with the first pin shaft (6) as the axis. When the first limiting device A (7) on the rotary wing armor (3) contacts the stop device A (13) on the center seat (2), the clockwise rotation of the rotary wing armor (3) and the follower ear seat (10) in the S direction stops, and the rotary wing armor (3) is fully deployed. Continue driving the composite rotary wing enlarging drill bit to rotate counterclockwise in the P direction and drill a preset amount in the M direction. Under the action of earth pressure resistance, the rotary wing B (11) rotates clockwise in the S direction relative to the rotary wing A (3) with the second pin (12) as the axis. When the limiting device B (16) on the rotary wing B (11) contacts the stopping device B (15) on the follower lug (10), the clockwise rotation of the rotary wing B (11) in the S direction stops, and the rotary wing B (11) is fully deployed. At this point, both the rotary wing A (3) and the rotary wing B (11) are fully deployed, and the composite rotary wing enlarging drill bit is in the maximum diameter expansion state.

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