Multi-wheel square pile drill bit

Abstract

The utility model belongs to rotary drilling rig technical field relates to a kind of multi-wheel square pile drill bits, comprising: drill bit support;Drive part, including two drive assemblies;Two sets of cutting components, two sets of cutting components are spaced along the length direction of drill bit support, and each set of cutting component at least includes first cutting wheel and second cutting wheel, and first cutting wheel and second cutting wheel are oppositely arranged along the width direction of drill bit support and coaxial;Two sets of drive assemblies are respectively connected with two sets of cutting components one-to-one, and drive two sets of cutting components to rotate in opposite directions;Drive component includes motor and shaft, motor is installed on the drill bit support, and the output end of motor is connected with first output mechanism, and first output mechanism is connected with the one end of shaft by first transmission mechanism;The other end of shaft is equipped with second transmission mechanism, and second output mechanism is connected by second transmission mechanism, and first output mechanism and second output mechanism are respectively connected two cutting wheels in cutting component.

Description

Technical Field

[0001] This utility model belongs to the field of rotary drilling rig technology and relates to a multi-wheel square pile drill bit. Background Technology

[0002] In the field of square pile construction, to ensure that square piles can be successfully driven into the ground, pre-drilling is usually performed using a round drill bit. Specifically, the number of drilling operations (one or more) depends on the actual size of the square pile. However, after the round drill bit is used, there will inevitably be areas inside the square pile that cannot be reached. For these areas, a square drill bit is typically used for subsequent finishing to ensure that the interior of the square pile meets construction requirements.

[0003] Currently, there are two main types of square pile drill bits commonly found on the market, namely as follows: Figure 1 and Figure 2 As shown. One type of square pile drill bit is equipped with two cutting wheels (such as...). Figure 1 Another type is equipped with six cutting wheels (such as...). Figure 2 Square pile drill bits equipped with two cutting wheels often experience hole deviation during actual drilling. This deviation not only affects the verticality and positional accuracy of the square pile, reducing construction quality, but in severe cases, it can even prevent the pile from being driven into the intended position, increasing construction difficulty and cost. Square pile drill bits equipped with six cutting wheels typically require multiple motors to drive them. However, rotary drilling rigs usually only provide two oil sources to the square pile drill bit. Due to the large number of motors in a square pile drill bit with six cutting wheels, uneven oil distribution is prone to occur during actual use. Uneven oil distribution leads to a series of serious problems. On the one hand, it can cause some motors to be damaged due to excessive local pressure, shortening the equipment's lifespan; on the other hand, it can prevent some motors from receiving sufficient power, resulting in insufficient driving force for the entire drill bit, affecting drilling efficiency and construction quality.

[0004] Given that both of the aforementioned common square pile drill bits have significant drawbacks and cannot adequately meet the actual needs of square pile construction, developing a square pile drill bit that prevents borehole deviation during drilling, minimizes equipment wear, and ensures construction quality and efficiency has become an urgent technical problem to be solved in the field of square pile construction. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a multi-wheel square pile drill bit to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A multi-wheel square pile drill bit, used in a rotary drilling rig, comprising:

[0008] The drill bit support includes a connection port for connecting to the working head of the rotary drilling rig;

[0009] A drive unit is mounted on the drill bit support, and the drive unit includes two drive components spaced apart along the length direction of the drill bit support.

[0010] Two sets of cutting components are connected to the drill bit holder. The two sets of cutting components are spaced apart along the length direction of the drill bit holder. Each set of cutting components includes at least a first cutting wheel and a second cutting wheel that are coaxial and arranged opposite to each other along the width direction of the drill bit holder. The length direction of the drill bit holder is perpendicular to the width direction of the drill bit holder.

[0011] The two sets of drive components are respectively connected to the two sets of cutting components one by one, and drive the two sets of cutting components to rotate in opposite directions;

[0012] The drive assembly includes a motor and a rotating shaft. The motor is mounted on the drill bit support. The output end of the motor is connected to a first output mechanism, and the first output mechanism is connected to one end of the rotating shaft through a first transmission mechanism.

[0013] The other end of the rotating shaft is provided with a second transmission mechanism, and a second output mechanism is connected to it through the second transmission mechanism. The first output mechanism and the second output mechanism are respectively arranged at both ends of the motor. The first output mechanism and the second output mechanism are respectively connected to two cutting wheels in the cutting assembly, so as to drive the first cutting wheel and the second cutting wheel in the cutting assembly through one motor.

[0014] Furthermore, it also includes a speed reducer, which is mounted on the drill bit support. The input end of the speed reducer is connected to the output end of the motor, and the first output mechanism is connected to the output end of the speed reducer.

[0015] Furthermore, the first output mechanism is a first output shaft or flange connected to the output end of the reducer.

[0016] Furthermore, the second output mechanism is a second output shaft or flange that is rotatably connected to the drill bit support.

[0017] Furthermore, the reducer, the first output mechanism, and the second output mechanism are arranged coaxially.

[0018] Furthermore, the rotating shaft is arranged on the outer circumference of the motor and parallel to the axis of the reducer.

[0019] Furthermore, both the first transmission mechanism and the second transmission mechanism are one of the following: a gear transmission mechanism, a belt transmission mechanism, or a chain transmission mechanism.

[0020] Furthermore, the cutting assembly also includes a third cutting wheel rotatably connected to the drill bit support, and the first cutting wheel, the second cutting wheel, and the third cutting wheel are arranged coaxially;

[0021] A connecting plate is provided in the first cutting wheel and connected to the inner wall of the first cutting wheel. The connecting plate is connected to the third cutting wheel to drive the third cutting wheel to rotate.

[0022] Furthermore, the bottom of the drill bit holder is provided with a first support plate and a second support plate arranged at intervals, the motor is mounted on the first support plate, and the first cutting wheel and the second cutting wheel are arranged on both sides of the first support plate and rotatably connected to the first support plate.

[0023] The second support plate is arranged on the side of the first cutting wheel away from the second cutting wheel, and the third cutting wheel is arranged on the side of the second support plate away from the first cutting wheel and is rotatably connected to the second support plate.

[0024] Furthermore, auxiliary guiding devices are provided at the four corners of the upper surface of the drill bit holder to assist in alignment.

[0025] The beneficial effects of this utility model are as follows:

[0026] 1. This utility model's multi-wheel square pile drill bit achieves a combination of compact structure and efficient transmission through the meticulous design of the drill bit support, drive unit, and two sets of cutting components. The drill bit support is equipped with a connection port for connection to the rotary drilling rig, and the bottom uses two or more support plates to mount the cutting and drive components, ensuring overall stability. The drive unit includes two sets of drive components, which drive two sets of side-by-side cutting components to rotate in opposite directions. Multiple coaxial cutting wheels in each set of cutting components are simultaneously driven by a single motor, ensuring rational oil supply distribution. This design simplifies the transmission structure, improves power transmission efficiency, and lays a solid foundation for subsequent drilling operations.

[0027] 2. This drill bit exhibits excellent stability and anti-deviation performance during drilling. The two sets of cutting components rotate in opposite directions, effectively counteracting the lateral forces generated during drill bit rotation, preventing borehole deviation, and ensuring the verticality and accuracy of the borehole. The drill barrel support uses multiple support plates to enhance overall rigidity and stress uniformity, enabling the drill bit to maintain a stable drilling posture even under complex geological conditions, reducing vibration and displacement. This design significantly improves the safety and quality of operations, and is particularly suitable for high-precision square pile construction.

[0028] 3. This technical solution features a large cutting component coverage area and a small drilling blind zone. The parallel arrangement of six cutting wheels significantly improves drilling efficiency and work quality. The use of two sets of drive components allows for more rational oil supply distribution, reducing the load on a single drive unit, thereby reducing energy consumption and equipment wear, and extending service life. Furthermore, the auxiliary guiding device further enhances the drill bit's guiding performance, ensuring the accuracy of the drilling direction. In summary, this multi-wheel square pile drill bit, through optimized design, achieves efficient, stable, and low-loss drilling results, demonstrating significant practical value.

[0029] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0031] Figure 1 This is a schematic diagram of the structure of a two-wheeled square drill in the background art;

[0032] Figure 2 This is a schematic diagram of the structure of a six-wheeled square drill in the background art;

[0033] Figure 3 This is a schematic diagram of the overall structure of a multi-wheel square pile drill bit according to the present invention;

[0034] Figure 4 This is a cross-sectional structural diagram of a multi-wheel square pile drill bit according to the present invention (a schematic diagram of a set of cutting components, a set of driving components and a drill bit support).

[0035] Reference numerals in the drawings: 1. Drill bit support; 1.1. First support plate; 1.2. Second support plate; 1.3. Auxiliary guide device; 1.4. Connecting port; 2. Cutting assembly; 2.1. First cutting wheel; 2.2. Second cutting wheel; 2.3. Third cutting wheel; 3. Reducer; 4. First output mechanism; 5. Rotating shaft; 6. First transmission mechanism; 7. Second transmission mechanism; 8. Second output mechanism; 9. Connecting plate; 10. Motor; 11. Connecting shaft. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0038] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0039] Example 1

[0040] This embodiment provides a multi-wheel square pile drill bit for use in rotary drilling rigs, and its structure is as follows: Figure 3 and Figure 4 As shown. This multi-stage square pile drill bit mainly includes a drill bit support 1, a cutting assembly 2, and a drive unit, the specific structure and function of which are described below.

[0041] The drill bit support 1 is the basic support structure for the entire drill bit. Its top has a connection port 1.4 for fixed connection with the working head of the rotary drilling rig, thus mounting the drill bit onto the rig. The bottom of the drill bit support 1 has two sets of support plates. Each set includes a first support plate 1.1 and a second support plate 1.2 arranged at intervals, for mounting the cutting assembly 2 and the drive assembly, respectively. The length direction of the drill bit support 1 is defined as the arrangement direction of the two sets of cutting assemblies, while the width direction is perpendicular to the length direction. The length direction of the drill bit support 1 is arranged along the lateral extension direction of the first support plate 1.1 and the second support plate 1.2. Furthermore, auxiliary guiding devices 1.3 are provided at the four corners of the upper surface of the drill bit support 1. Their dimensions match the dimensions of the target square well, used to assist in guiding the drill bit during drilling and prevent deviation due to rock complexity or inconsistent cutting volume.

[0042] In another embodiment, only one set of support plates may be provided at the bottom of the drill bit holder 1. Similarly, the first support plate 1.1 and the second support plate 1.2 are arranged at intervals, but the two sets of cutting components 2 are respectively arranged at both ends of the first support plate 1.1 and the second support plate 1.2, thereby improving the support stability of the drill bit holder 1.

[0043] Specifically, the auxiliary guiding device 1.3 is a roller installed on the drill bit bracket 1. The roller is used to roll and rub against the inner wall of the square pile to assist in guidance.

[0044] It should be noted that the length and width directions of the drill bit holder 1 are not used to limit the specific length and width dimensions of the drill bit holder 1, but only represent two horizontal directions that are perpendicular to each other.

[0045] There are two sets of cutting components 2, spaced apart along the length of the drill bit holder 1, and the two sets of cutting components are arranged symmetrically with respect to the central axis of the drill bit. Each set of cutting components includes three coaxially arranged cutting wheels, namely the first cutting wheel 2.1, the second cutting wheel 2.2, and the third cutting wheel 2.3. Each cutting wheel has multiple cutting teeth arranged circumferentially for cutting the target object (such as rock or soil).

[0046] The first cutting wheel 2.1 and the second cutting wheel 2.2 are arranged opposite to each other along the width direction of the drill bit bracket 1, located on both sides of the first support plate 1.1, and are connected to the first support plate 1.1 by a rotatable connection.

[0047] The third cutting wheel 2.3 is located on the side of the second support plate 1.2 away from the first cutting wheel 2.1, and is rotatably connected to the second support plate 1.2 via the rotating shaft 11.

[0048] A connecting plate 9 is provided inside the first cutting wheel 2.1. One end of the connecting plate 9 is fixed to the inner wall of the first cutting wheel 2.1, and the other end is connected to the third cutting wheel 2.3, so that when the first cutting wheel 2.1 rotates, it drives the third cutting wheel 2.3 to rotate synchronously through the connecting plate 9. By setting up a three-cutting wheel structure, the cutting area of ​​each cutting component is increased, thereby improving drilling efficiency.

[0049] The drive unit includes two drive assemblies, spaced apart along the length of the drill bit holder 1, each connected to one of the two sets of cutting assemblies. These assemblies drive the two sets of cutting assemblies to rotate in opposite directions, counteracting the lateral force generated during drill bit rotation and preventing deviation. Each drive assembly includes a motor 10, a rotating shaft 5, a first output mechanism 4, a second output mechanism 8, a first transmission mechanism 6, and a second transmission mechanism 7, arranged as follows:

[0050] The motor 10 is mounted on the first support plate 1.1, located between the first cutting wheel 2.1 and the second cutting wheel 2.2, specifically within the first cutting wheel 2.1. Its output end is connected to the first output mechanism 4 via a reducer 3. The input end of the reducer 3 is connected to the output end of the motor 10, and the output end is connected to the first output mechanism 4. This reduces the speed of the motor 10 and increases the output torque to meet drilling requirements.

[0051] The first output mechanism 4 is a first output shaft or flange, which is coaxially connected to the output end of the reducer 3 and directly connected to the first cutting wheel 2.1 to drive the first cutting wheel 2.1 to rotate.

[0052] In another embodiment, the first output mechanism 4 can also be directly set as the output end body of the reducer 3, that is, a part of the reducer body (such as the output end housing).

[0053] The rotating shaft 5 is arranged on the outer circumference of the reducer 3 and is parallel to the axis of the reducer 3. One end of the shaft is connected to the first output mechanism 4 through the first transmission mechanism 6, and the other end is connected to the second output mechanism 8 through the second transmission mechanism 7.

[0054] The second output mechanism 8 is a second output shaft or flange, which is rotatably connected to the drill bit support 1 and drives the second cutting wheel 2.2 to rotate.

[0055] Both the first transmission mechanism 6 and the second transmission mechanism 7 employ gear transmission mechanisms, transmitting power through gear meshing. Specifically, the first transmission mechanism 6 includes a first gear fixedly mounted on the first output mechanism 4 and a second gear fixedly mounted on one end of the rotating shaft 5. The first gear and the second gear mesh directly, thereby transmitting the rotational power of the first output mechanism 4 to the rotating shaft 5. The second transmission mechanism 7 includes a third gear fixedly mounted on the other end of the rotating shaft 5 and a fourth gear fixedly mounted on the second output mechanism 8. The third gear and the fourth gear mesh directly. The second output mechanism 8 is a second output shaft rotatably connected to the housing 1 via bearings, used to receive power from the rotating shaft 5 and output it.

[0056] In the above structure, the reducer 3, the first output mechanism 4, and the second output mechanism 8 are arranged coaxially to ensure the stability of power transmission. A single motor 10 simultaneously drives the first cutting wheel 2.1 and the second cutting wheel 2.2, and via the connecting plate 9, drives the third cutting wheel 2.3 to rotate, simplifying the drive structure and reducing manufacturing costs.

[0057] The working principle is as follows:

[0058] When the rotary drilling rig starts, it drives motor 10 through oil pipes. Motor 10 outputs power through reducer 3. The first output mechanism 4 directly drives the first cutting wheel 2.1 to rotate. Simultaneously, the power is transmitted to the second output mechanism 8 through the first transmission mechanism 6, the rotating shaft 5, and the second transmission mechanism 7, driving the second cutting wheel 2.2 to rotate. The first cutting wheel 2.1 drives the third cutting wheel 2.3 to rotate synchronously through the connecting plate 9. The motors 10 of the two sets of drive components rotate in opposite directions, so that the rotation directions of the two sets of cutting components are opposite, thereby canceling out the lateral force and improving drilling accuracy and efficiency.

[0059] Example 2

[0060] The main difference between this embodiment and embodiment 1 lies in the installation position of the drive component and the adjustment of some transmission structures; the rest of the structure is the same as or similar to that of embodiment 1.

[0061] In this embodiment, the overall layout of the drill bit holder 1, cutting assembly 2, and drive unit is consistent with that of Embodiment 1, namely, it still includes a connection port 1.4, two sets of support plates (first support plate 1.1 and second support plate 1.2), two sets of cutting assemblies (each set including a first cutting wheel 2.1, a second cutting wheel 2.2, and a third cutting wheel 2.3), and an auxiliary guide device 1.3. However, the installation position of the drive assembly is different:

[0062] For the first set of cutting components, the motor 10 of the drive component is mounted on the first support plate 1.1, located between the first cutting wheel 2.1 and the second cutting wheel 2.2. Its output end is connected to the first output mechanism 4 through the reducer 3. The first output mechanism 4 drives the first cutting wheel 2.1. The rotating shaft 5 transmits power to the second output mechanism 8 through the first transmission mechanism 6 and the second transmission mechanism 7, driving the second cutting wheel 2.2. The first cutting wheel 2.1 drives the third cutting wheel 2.3 to rotate through the connecting plate 9.

[0063] For the second set of cutting components, the motor 10 of the drive component is mounted on the second support plate 1.2, and is arranged centrally symmetrically with the drive component of the first set of cutting components. The output end of the motor 10 is connected to the first output mechanism 4 through the reducer 3, driving the second cutting wheel 2.2. The rotating shaft 5 transmits power to the first output mechanism 4 through the first transmission mechanism 6 and the second transmission mechanism 7, driving the first cutting wheel 2.1. The first cutting wheel 2.1 drives the third cutting wheel 2.3 to rotate through the connecting plate 9.

[0064] In this embodiment, the first transmission mechanism 6 and the second transmission mechanism 7 can be selected from gear transmission mechanism, belt transmission mechanism, or chain transmission mechanism as needed. For example, if the first transmission mechanism 6 is a chain transmission mechanism, it specifically includes a first sprocket fixedly mounted on the first output mechanism 4, a second sprocket fixedly mounted on one end of the rotating shaft 5, and a chain connecting the first and second sprockets, transmitting the rotational power of the first output mechanism 4 to the rotating shaft 5 via the chain. The second transmission mechanism 7 is also a chain transmission mechanism, including a third sprocket fixedly mounted on the other end of the rotating shaft 5, a fourth sprocket fixedly mounted on the second output mechanism 8, and a chain connecting the third and fourth sprockets. The second output mechanism 8 is a second output shaft rotatably connected to the housing 1 via bearings, used to receive power from the rotating shaft 5 and output it.

[0065] The working principle is as follows:

[0066] Similar to Embodiment 1, motor 10 outputs power through reducer 3 to drive the first cutting wheel 2.1 and the second cutting wheel 2.2 to rotate, and drives the third cutting wheel 2.3 to rotate synchronously through connecting plate 9. The two sets of drive components are mounted on different support plates and rotate in opposite directions to ensure that the rotation directions of the two sets of cutting components are opposite, thereby canceling out lateral forces. Alternatively, if both sets of drive components are mounted on the first support plate 1.1, the same effect can be achieved simply by adjusting the rotation directions of the two motors 10 to be opposite.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A multi-wheel square pile drill bit for use in a rotary drilling rig, comprising: The drill bit support includes a connection port for connecting to the working head of the rotary drilling rig; A drive unit is mounted on the drill bit support, and the drive unit includes two drive components spaced apart along the length direction of the drill bit support. Two sets of cutting components are connected to the drill bit holder. The two sets of cutting components are spaced apart along the length direction of the drill bit holder. Each set of cutting components includes at least a first cutting wheel and a second cutting wheel that are coaxial and arranged opposite to each other along the width direction of the drill bit holder. The length direction of the drill bit holder is perpendicular to the width direction of the drill bit holder. The two sets of drive components are respectively connected to the two sets of cutting components one-to-one, and drive the two sets of cutting components to rotate in opposite directions, characterized in that, The drive assembly includes a motor and a rotating shaft. The motor is mounted on the drill bit support. The output end of the motor is connected to a first output mechanism, and the first output mechanism is connected to one end of the rotating shaft through a first transmission mechanism. The other end of the rotating shaft is provided with a second transmission mechanism, and a second output mechanism is connected to it through the second transmission mechanism. The first output mechanism and the second output mechanism are respectively arranged at both ends of the motor. The first output mechanism and the second output mechanism are respectively connected to two cutting wheels in the cutting assembly, so as to drive the first cutting wheel and the second cutting wheel in the cutting assembly through one motor.

2. The multi-stage square pile drill bit according to claim 1, characterized in that, It also includes a speed reducer, which is mounted on the drill bit bracket. The input end of the speed reducer is connected to the output end of the motor, and the first output mechanism is connected to the output end of the speed reducer.

3. The multi-stage square pile drill bit according to claim 2, characterized in that, The first output mechanism is a first output shaft or flange connected to the output end of the reducer.

4. The multi-stage square pile drill bit according to claim 1, characterized in that, The second output mechanism is a second output shaft or flange that is rotatably connected to the drill bit support.

5. The multi-stage square pile drill bit according to claim 2, characterized in that, The reducer, the first output mechanism, and the second output mechanism are arranged coaxially.

6. The multi-stage square pile drill bit according to claim 2, characterized in that, The rotating shaft is arranged on the outer circumference of the motor and parallel to the axis of the reducer.

7. The multi-stage square pile drill bit according to claim 1, characterized in that, Both the first transmission mechanism and the second transmission mechanism are one of the following: gear transmission mechanism, belt transmission mechanism, or chain transmission mechanism.

8. The multi-stage square pile drill bit according to claim 1, characterized in that, The cutting assembly further includes a third cutting wheel rotatably connected to the drill bit support, and the first cutting wheel, the second cutting wheel, and the third cutting wheel are arranged coaxially. A connecting plate is provided in the first cutting wheel and connected to the inner wall of the first cutting wheel. The connecting plate is connected to the third cutting wheel to drive the third cutting wheel to rotate.

9. The multi-stage square pile drill bit according to claim 8, characterized in that, The bottom of the drill bit holder is provided with a first support plate and a second support plate arranged at intervals. The motor is mounted on the first support plate. The first cutting wheel and the second cutting wheel are arranged on both sides of the first support plate and are rotatably connected to the first support plate. The second support plate is arranged on the side of the first cutting wheel away from the second cutting wheel, and the third cutting wheel is arranged on the side of the second support plate away from the first cutting wheel and is rotatably connected to the second support plate.

10. The multi-stage square pile drill bit according to claim 1, characterized in that, Auxiliary guiding devices are provided at the four corners of the upper surface of the drill bit holder to assist in alignment.

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