Hollow shaft of power head of gas lift reverse circulation drilling machine
By setting a second annular boss and an axial through hole on the hollow shaft of the power head of the air lifting reverse circulation drill rig, and adopting a structure that can install radial bearings and thrust bearings at the same time, the existing power output shaft lacks ability when subjected to strong time-varying and large impact loads, and the functions of power transmission, mud discharge and air input are realized, and the adaptability and reliability of the drill rig are improved.
Patent Information
- Application Number
- CN202411725556.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-02-25
AI Technical Summary
The existing power output shafts have poor capabilities when subjected to strong time-varying and large impact axial loads, and cannot transport power, mud and air at the same time, so the connection reliability and convenience are not good.
A hollow shaft of the power head of the air lifting reverse circulation drill rig is designed. By providing a second annular boss on the shaft body, and processing an axial through hole thereon, and inserting a slag discharge pipe, rotary driving, mud discharge and air input are realized. At the same time, a first annular boss structure that can simultaneously install radial bearings and thrust bearings is adopted to improve the adaptability to strong time-varying, large impacts, and multi-directional loads.
It realizes the ability of the drilling rig to adapt to strong time-varying, large impacts, and multi-directional loads. It has simple structure and reliable use. It can complete the functions of power transmission, mud discharge and air input at the same time, and has a wide range of practicality.
Smart Images
Figure CN119508333A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of power output shafts, in particular to a hollow shaft of a power head of a gas lift reverse circulation drilling rig. Background Art
[0002] Offshore wind power has the advantages of large single-unit capacity, low noise limit, large energy output, small visual impact, and no occupation of land resources, and has broad development prospects. Pile foundation construction is an important part of offshore wind power construction. Because traditional pile-driving machinery is difficult to adapt to the offshore geological environment with harsh sea conditions, complex strata, and hard rocks, it is necessary to adopt gas lift reverse circulation drilling technology to solve the problems of low efficiency and poor quality of pile foundation construction in offshore wind farms. The power head is a key component of the gas lift reverse circulation drilling rig. Its power output shaft not only bears strong time-varying and large-impact bidirectional axial compression and pulling force and rotary drilling resistance at the same time, but also needs to transmit the compressed air required for gas lift reverse circulation downward, and at the same time, it must discharge the slag-carrying mud upward. The existing power output shaft has the following main deficiencies: first, the ability to withstand strong time-varying and large-impact axial loads is poor; second, it cannot meet the functional requirements of simultaneously transmitting power, mud, air, etc.; third, the connection reliability and convenience of the related components at both ends of the shaft are not good.
[0003] Therefore, we propose a hollow shaft for the power head of a gas lift reverse circulation drilling rig. Summary of the invention
[0004] The object of the present invention is to provide a hollow shaft of a power head of a gas lift reverse circulation drilling rig to solve the problems raised in the above background technology.
[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a hollow shaft of a gas lift reverse circulation drilling rig power head, comprising a shaft body, a first cylindrical surface and a third cylindrical surface are arranged at both ends of the outer surface of the shaft body, a second cylindrical surface is arranged on the right side of the first cylindrical surface, a first annular boss is arranged on the right side of the second cylindrical surface, a second annular boss is arranged on the inner surface of the shaft body, an axial through hole is arranged on the second annular boss, and axial blind holes are arranged on the end faces at both ends of the shaft body.
[0006] Furthermore, the second cylindrical surface is formed into an external spline.
[0007] Furthermore, the inner diameter of the second annular boss on the inner surface of the shaft body is smaller than the diameter of the middle outer cylindrical surface of the built-in slag discharge pipe.
[0008] Furthermore, the left end surface of the shaft body is provided with at least one axial blind hole, and all of the axial blind holes are processed with internal threads.
[0009] Furthermore, a light hole is provided on the right end face of the shaft body, and an axial blind hole is provided on the right end face of the shaft body. The axial blind holes are all processed with internal threads, and the axial arc angle between adjacent axial blind holes is. degrees, and the light holes are respectively provided between adjacent axial blind holes.
[0010] Furthermore, the second annular boss is provided with an axial through hole, and one of the axial through holes is processed with an internal thread.
[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging a second annular boss on the shaft body, machining an axial through hole on the second annular boss, and placing a slag discharge pipe in the axial through hole, the functional requirements of drilling rig rotation drive, slag mud discharge, compressed air input, etc. are achieved. The first annular boss structure on which radial bearings and thrust bearings can be installed at the same time is adopted, which effectively improves the adaptability of the drilling rig to strong time-varying, large impact, and multi-directional loads. It has a simple structure, is reliable to use, and has wide practicality in this technical field. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structure at AA of the present invention; In the figure: 1, shaft body; 2, first cylindrical surface; 3, second cylindrical surface; 4, first annular boss; 5, third cylindrical surface; 6, second annular boss; 7, axial through hole; 8, axial blind hole; 9, light hole. DETAILED DESCRIPTION
[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0014] See also Figure 1-2The present invention provides a technical solution: a hollow shaft of a power head of a gas lift reverse circulation drilling rig, comprising a shaft body 1, a first cylindrical surface 2 and a third cylindrical surface 5 are arranged at both ends of the outer surface of the shaft body 1, a second cylindrical surface 3 is arranged on the right side of the first cylindrical surface 2, a first annular boss 4 is arranged on the right side of the second cylindrical surface 3, a second annular boss 6 is arranged on the inner surface of the shaft body 1, an axial through hole 7 is arranged on the second annular boss 6, and axial blind holes 8 are arranged on both end surfaces of the shaft body 1. By arranging the second annular boss 6 on the shaft body 1, machining the axial through hole on the second annular boss 6, and placing the slag discharge pipe in the axial through hole, the functional requirements of the drilling rig rotary drive, slag mud discharge, compressed air input, etc. are realized. The first annular boss 4 structure on which radial bearings and thrust bearings can be installed at the same time is adopted, which effectively improves the adaptability of the drilling rig to strong time-varying, large impact, and multi-directional loads. It has a simple structure and is reliable to use, and has wide practicality in the technical field.
[0015] Reference embodiment: the second cylindrical surface 3 is added to form an external spline, the groove processed by the external spline is shallower, the stress concentration at the tooth root is smaller, the number of teeth is larger, the total contact area is larger, and it can withstand a larger load.
[0016] Reference embodiment: The inner diameter of the second annular boss 6 on the inner surface of the shaft body 1 is smaller than the diameter of the middle outer cylindrical surface of the built-in slag discharge pipe, realizing the functional requirements of drilling rig rotation drive, slag mud discharge, compressed air input, etc.
[0017] Reference embodiment: There are 10 to 14 axial blind holes 8 arranged on the left end face of the shaft body 1, and the axial blind holes 1 are all processed with internal threads. There are 12 light holes 9 arranged on the right end face of the shaft body 1, and 14 axial blind holes 8 are arranged on the right end face of the shaft body 1, and the axial blind holes 8 are all processed with internal threads. The axial arc angle between adjacent axial blind holes 8 is 22.5 degrees. The 12 light holes are respectively arranged between adjacent axial blind holes 8, and the axial blind holes 8 provide multiple connection points, which increase the installation and connection strength of the shaft body 1 and ensure the stability of operation in harsh environments.
[0018] Reference embodiment: 16 axial through holes 7 are arranged on the second annular boss 6, and 4 of the axial through holes are processed with internal threads, so as to fix the slag discharge pipe well to adapt to complex and harsh environments.
[0019] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A hollow shaft of a power head of a gas lift reverse circulation drilling rig, comprising a shaft body (1), characterized in that: The shaft body (1) is provided with a first cylindrical surface (2) and a third cylindrical surface (5) at both ends of its outer surface, a second cylindrical surface (3) is provided on the right side of the first cylindrical surface (2), a first annular boss (4) is provided on the right side of the second cylindrical surface (3), a second annular boss (6) is provided on the inner surface of the shaft body (1), an axial through hole (7) is provided on the second annular boss (6), and axial blind holes (8) are provided on both end surfaces of the shaft body (1).
2. The hollow shaft of the power head of a gas lift reverse circulation drilling rig according to claim 1, characterized in that: The second cylindrical surface (3) is formed into an external spline.
3. The hollow shaft of the power head of a gas lift reverse circulation drilling rig according to claim 1, characterized in that: The inner diameter of the second annular boss (6) on the inner surface of the shaft body (1) is smaller than the diameter of the middle outer cylindrical surface of the built-in slag discharge pipe.
4. The hollow shaft of the power head of a gas lift reverse circulation drilling rig according to claim 1, characterized in that: The number of axial blind holes (8) arranged on the left end surface of the shaft body (1) is 10 to 14, and the axial blind holes (8) are all processed with internal threads.
5. The hollow shaft of the power head of a gas lift reverse circulation drilling rig according to claim 1, characterized in that: The right end surface of the shaft body (1) is provided with 12 light holes (9), and the right end surface of the shaft body (1) is provided with 14 axial blind holes (8), the axial blind holes (8) are all processed with internal threads, the axial arc angle between adjacent axial blind holes (8) is 22.5 degrees, and the 12 light holes are respectively arranged between adjacent axial blind holes (8).
6. The hollow shaft of the power head of a gas lift reverse circulation drilling rig according to claim 1, characterized in that: The second annular boss (6) is provided with 16 axial through holes (7), and 4 of the axial through holes are processed with internal threads.