An improved rotary pile core drilling bit device

Abstract

This utility model provides an improved rotary drilling core sampling device, including a drill bit body. The drill bit body is generally cylindrical, with a connecting part at the top and several drill teeth on the bottom end face. The outer circumferential surface of the drill bit body has external threads, and the inner circumferential surface of the drill bit body has internal threads. This utility model provides threads on both the inner and outer surfaces of the drill bit body. Firstly, the internal threads significantly increase the frictional resistance during core sampling and lifting, firmly fixing the core sample inside the drill bit and preventing it from easily falling out during vertical lifting. Secondly, the external threads enhance the rotary drilling effect and speed, improving drilling efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of core drilling bits, and in particular relates to an improved rotary pile core drilling bit device. Background Technology

[0002] Rotary drilling piles are a common type of pile foundation construction, especially suitable for rocky areas. During the pile formation process, rock core samples need to be taken for point load tests on the rock. Therefore, it is very important to be able to successfully extract the rock samples. However, in actual work, when the core sampling depth is deep or the rock is loose, it is difficult to extract the rock core completely because the frictional resistance between the core drill bit and the rock sample is insufficient to resist gravity. Utility Model Content

[0003] In view of this, the present invention aims to propose an improved rotary drilling core bit device to increase side friction resistance, enhance the rotary drilling effect, and thus greatly improve the core sampling capability.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] An improved rotary pile core drilling bit device includes a drill bit body, the drill bit body is generally cylindrical, the top end of the drill bit body is provided with a connecting part, and the bottom end face is provided with a plurality of drill teeth.

[0006] The outer circumferential surface of the drill bit body is provided with external threads;

[0007] The circumferential inner surface of the drill bit body is provided with internal threads.

[0008] Furthermore, the external and internal threads rotate in the same direction.

[0009] Furthermore, the outer diameter of the drill bit body is 1200mm and the inner diameter is 1000mm.

[0010] Furthermore, the external thread and the internal thread have the same structure;

[0011] The external thread is a single-start rectangular thread; the ratio between the major diameter and the minor diameter of the external thread is 10:9.

[0012] If the pitch of the external thread is a and the length of the drill bit body is b, then the ratio between a and b is in the range of 1:8 to 1:9.

[0013] Furthermore, the external thread is provided with several chip removal grooves, which are parallel to the axis of the drill bit body.

[0014] Furthermore, the number of chip removal grooves is at least 6, and they are evenly distributed on the circumferential surface of the drill bit body;

[0015] The width of the chip removal groove is equal to the depth of the chip removal groove.

[0016] Compared with the prior art, the improved rotary drilling core bit device of this utility model has the following advantages:

[0017] (1) The improved rotary drilling core bit device of this utility model has threads on the inner and outer surfaces of the drill bit body. The inner thread can greatly increase the frictional resistance during the core extraction process, so that the core is firmly fixed in the drill bit and is not easy to fall off during the vertical lifting process. The outer thread can enhance the rotary effect and speed, and improve the drilling efficiency.

[0018] (2) The improved rotary pile core drilling bit device of this utility model is provided with a chip removal groove on the surface of the drill bit body to improve drilling efficiency. Attached Figure Description

[0019] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0020] Figure 1 This is a schematic diagram of an improved rotary drilling core bit device according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of an improved rotary pile core drilling bit device according to an embodiment of the present utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Drill bit body; 11. External thread; 12. Internal thread; 13. Chip removal groove; 2. Connecting part; 3. Drill tooth. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] An improved rotary pile core drilling bit device, such as Figure 1 Figure 2 As shown, it includes a drill bit body 1, which is cylindrical in shape. The top end of the drill bit body is provided with a connecting part 2, and the bottom end face is provided with a number of drill teeth 3.

[0029] The outer circumferential surface of the drill bit body 1 is provided with an external thread 11;

[0030] The inner circumferential surface of the drill bit body 1 is provided with an internal thread 12.

[0031] The internal thread 12 and the external thread 11 work together to form an axial self-cleaning effect, reducing rock cuttings accumulation; at the same time, the thread engagement disperses drilling pressure, reducing the risk of stress concentration.

[0032] Preferably, the external thread 11 and the internal thread 12 rotate in the same direction; when rotating in the same direction, the thread groove is consistent with the direction of rock cutting movement, reducing the accumulation of rock cutting in the thread gap and avoiding drill jamming;

[0033] Furthermore, the unidirectional force reduces the relative sliding friction of the threaded meshing surfaces, lowers the wear rate, and extends the number of times it can be reused.

[0034] Preferably, the outer diameter of the drill bit body 1 is 1200mm and the inner diameter is 1000mm.

[0035] Preferably, the external thread 11 and the internal thread 12 have the same structure; the external thread 11 is a single-start rectangular thread; the ratio between the major diameter and minor diameter of the external thread 11 is 10:9; the pitch of the external thread 11 is a, and the length of the drill bit body 1 is b, then the ratio between a and b is in the range of 1:8-1:9; a shorter pitch facilitates timely removal of rock cuttings and provides high load-bearing capacity; the rectangular thread has a large contact area, strong resistance to transverse shear, and is suitable for transmitting high torque.

[0036] Preferably, the external thread 11 is provided with a plurality of chip removal grooves 13, which are parallel to the axis of the drill bit body 1; directly guiding the rock cuttings to be discharged axially, avoiding spiral winding;

[0037] Preferably, the number of chip removal grooves 13 is at least 6, which are evenly distributed on the circumferential surface of the drill bit body 1; the design of more than 6 grooves increases the chip removal area and significantly reduces the probability of rock cuttings accumulation.

[0038] The width of the chip removal groove 13 is equal to the depth of the chip removal groove 13, so as to ensure chip removal efficiency while maintaining structural rigidity through the remaining wall thickness.

[0039] When using this device, the connecting part 2 is connected to the drilling equipment. The connection methods include, but are not limited to, quick-release connection, snap-fit ​​connection, and bolt connection.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An improved rotary auger core drill apparatus, characterized by: Includes a drill bit body, the drill bit body is generally cylindrical, the top of the drill bit body is provided with a connecting part, and the bottom end face is provided with a number of drill teeth; The outer circumferential surface of the drill bit body is provided with external threads; The circumferential inner surface of the drill bit body is provided with internal threads.

2. The improved auger-coring drill bit apparatus of claim 1, wherein: The external and internal threads rotate in the same direction.

3. The improved auger cast pile core drill bit apparatus of claim 1, wherein: The drill bit body has an outer diameter of 1200mm and an inner diameter of 1000mm.

4. The improved auger cast pile coring bit apparatus of claim 1, wherein: The external thread and the internal thread have the same structure; The external thread is a single-start rectangular thread; the ratio between the major diameter and the minor diameter of the external thread is 10:

9. If the pitch of the external thread is a and the length of the drill bit body is b, then the ratio between a and b is in the range of 1:8 to 1:

9.

5. The improved auger cast pile coring bit apparatus of claim 1, wherein: The external thread is provided with several chip removal grooves, which are parallel to the axis of the drill bit body.

6. An improved auger coring drill bit assembly as defined in claim 5 wherein: The number of chip removal grooves is at least 6, and they are evenly distributed on the circumferential surface of the drill bit body; The width of the chip removal groove is equal to the depth of the chip removal groove.

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