Welded type drilling hook barrel and drilling hook

Abstract

This utility model relates to a welded drilling hook cylinder, comprising: a steel plate and a steel pipe. A circular through hole is formed at the center of the steel plate, and the steel pipe is coaxially embedded in the circular through hole and welded to the steel plate. Two cylinder pin holes are symmetrically formed on the combined structure of the steel plate and the steel pipe, and the axes of both cylinder pin holes are perpendicular to the axis of the steel pipe. The axis of each cylinder pin hole is tangent to the outer wall of the steel pipe. Each cylinder pin hole penetrates the sidewalls of the steel plate and the steel pipe. The diameter of each cylinder pin hole is smaller than the sum of the wall thicknesses of the steel plate and the steel pipe. The cylinder pin holes are used to insert cylinder pins to distribute the load acting on the welded area during operation. This device can effectively alleviate the inherent contradiction between reliability, load-bearing efficiency, and economy in traditional drilling hook cylinders.

Description

Technical Field

[0001] This utility model belongs to the field of oil drilling and production equipment manufacturing technology, specifically relating to a welded drilling hook cylinder and a drilling hook. Background Technology

[0002] As a key hoisting device in oil drilling operations, the drilling hook's cylinder structure bears the entire weight of the drill string and dynamic impact loads, making it a core component for ensuring drilling safety. Traditionally, drilling hook cylinders are manufactured using casting or forging processes, which face significant technical bottlenecks in practical applications: casting easily produces internal defects such as porosity and shrinkage, leading to fatigue cracks under high-pressure alternating loads and sudden fracture; while forging can improve material density, it requires integrating complex features such as pin holes and annular supports, making forging difficult, requiring multiple hot working processes, and consuming a lot of energy, significantly increasing manufacturing costs. These technological shortcomings make it difficult for existing drilling hook cylinders to achieve both high reliability and economy. Utility Model Content

[0003] To address the aforementioned problems in the existing technology, this utility model provides a welded drilling hook cylinder and a drilling hook. The technical problem to be solved by this utility model is achieved through the following technical solution:

[0004] In a first aspect, this utility model provides a welded drilling hook cylinder, comprising: a steel plate and a steel pipe, wherein a circular through hole is formed at the center of the steel plate, and the steel pipe is coaxially embedded in the circular through hole and welded to the steel plate; two cylinder pin holes are symmetrically formed on the combined structure of the steel plate and the steel pipe, and: the axes of the two cylinder pin holes are perpendicular to the axis of the steel pipe; the axis of each cylinder pin hole is tangent to the outer wall of the steel pipe; each cylinder pin hole penetrates the side wall of the steel plate and the steel pipe; the diameter of each cylinder pin hole is smaller than the sum of the wall thicknesses of the steel plate and the steel pipe; the cylinder pin holes are used to insert cylinder pins to share the load acting on the welding area during operation.

[0005] In some embodiments, both the steel plate and the steel pipe are made of alloy steel with a yield strength ≥ 500 MPa.

[0006] In some embodiments, along the direction parallel to the axis of the steel pipe, the inner wall diameter of the end of the steel pipe furthest from the steel plate is smaller than the inner wall diameter of the end of the steel pipe closest to the steel plate.

[0007] In some embodiments, the planar cross-section of the steel plate is rectangular.

[0008] Secondly, this utility model provides a drilling hook, which includes: a boom connecting mechanism having two symmetrically distributed lifting lugs; a welded drilling hook cylinder as described in the first aspect, wherein two cylinder pin holes of the welded drilling hook cylinder are coaxially aligned with the two lifting lugs; a cylinder pin penetrating the cylinder pin holes and the lifting lugs to fix the welded drilling hook cylinder to the boom connecting mechanism; wherein, during operation, the operating load is transmitted to the boom connecting mechanism through the cylinder pins, and the stress acting on the welded area of ​​the welded drilling hook cylinder is shared through the cylinder pin holes.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] To address the challenge of balancing high reliability and economy in existing drilling hook barrels, this invention provides a welded drilling hook barrel and drilling hook. This barrel utilizes welding instead of traditional casting, simplifying the manufacturing process, significantly reducing material waste and processing energy consumption, and completely eliminating the risk of fracture caused by casting defects. A unique design, with a pin hole tangentially penetrating the steel plate and pipe, effectively distributes and transmits the operating load via the pin, significantly alleviating stress concentration in the welded area, greatly delaying fatigue crack initiation, and extending the barrel's service life. Furthermore, the use of high-strength alloy steel gives the barrel excellent resistance to plastic deformation. Combined with a geometric constraint design where the hole diameter is strictly smaller than the combined wall thickness, it ensures the shear strength of the hole wall and the accuracy of the shaft-hole fit under extreme loads, avoiding edge crushing failure common in traditional structures. This device effectively alleviates the inherent contradiction between reliability, load-bearing efficiency, and economy in traditional drilling hook barrels, providing a new generation solution for high-load drilling and production conditions. Attached Figure Description

[0011] Figure 1 This is a half-section front view of a welded drilling hook cylinder provided by this utility model;

[0012] Figure 2 This is a top view of a welded drilling hook cylinder provided by this utility model.

[0013] Figure label:

[0014] 1-Steel plate; 2-Steel pipe; 3-Cylinder pin hole. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0016] To address the challenge of balancing high reliability and economy in existing drilling hook barrels, this invention provides a welded drilling hook barrel and drilling hook. This barrel utilizes welding instead of traditional casting, simplifying the manufacturing process, significantly reducing material waste and processing energy consumption, and completely eliminating the risk of fracture caused by casting defects. A unique design, with a pin hole tangentially penetrating the steel plate and pipe, effectively distributes and transmits the operating load via the pin, significantly alleviating stress concentration in the welded area, greatly delaying fatigue crack initiation, and extending the barrel's service life. Furthermore, the use of high-strength alloy steel gives the barrel excellent resistance to plastic deformation. Combined with a geometric constraint design where the hole diameter is strictly smaller than the combined wall thickness, it ensures the shear strength of the hole wall and the accuracy of the shaft-hole fit under extreme loads, avoiding edge crushing failure common in traditional structures. This device effectively alleviates the inherent contradiction between reliability, load-bearing efficiency, and economy in traditional drilling hook barrels, providing a new generation solution for high-load drilling and production conditions.

[0017] The present invention will now be described in detail with reference to the accompanying drawings, including a welded drilling hook cylinder and a drilling hook.

[0018] Figure 1 This is a half-section front view of a welded drilling hook cylinder provided by this utility model. Figure 2 This is a top view of a welded drilling hook cylinder provided by this utility model.

[0019] like Figure 1-2 As shown, the welded drilling hook cylinder includes: a steel plate 1 and a steel pipe 2. A circular through hole is opened at the center of the steel plate 1, and the steel pipe 2 is coaxially embedded in the circular through hole and welded to the steel plate 1. Two cylinder pin holes 3 are symmetrically opened on the combined structure of the steel plate 1 and the steel pipe 2, and: the axes of the two cylinder pin holes 3 are perpendicular to the axis of the steel pipe 2; the axis of each cylinder pin hole 3 is tangent to the outer wall of the steel pipe 2; each cylinder pin hole 3 penetrates the side wall of the steel plate 1 and the steel pipe 2; the diameter of each cylinder pin hole 3 is less than the sum of the wall thicknesses of the steel plate 1 and the steel pipe 2; the cylinder pin holes 3 are used to insert cylinder pins to share the load acting on the welding area during operation.

[0020] Here, both steel plate 1 and steel pipe 2 are made of alloy steel with a yield strength ≥ 500 MPa. A yield strength ≥ 500 MPa means that the ability to resist permanent deformation under extreme loads (such as instantaneous impact of the drill string) is significantly enhanced, preventing structural instability caused by local yielding of the casing. Furthermore, when the casing is subjected to millions of cyclic loads during drilling operations, it can effectively suppress crack initiation under alternating loads, significantly improving fatigue life. Consequently, the weight of the casing can be appropriately reduced under the same load-bearing requirements, thus reducing the energy consumption of the drilling rig.

[0021] Here, the cross-sectional shape of steel plate 1 is rectangular, with a circular through hole at its center. The outer diameter of steel pipe 2 is the same, but the inner diameters at both ends are different. Specifically, along the axis parallel to the steel pipe 2, the inner diameter of the end of steel pipe 2 furthest from steel plate 1 is smaller than the inner diameter of the end of steel pipe 2 closest to steel plate 1. Furthermore, by providing a cylinder pin hole 3 in the combined structure of steel plate 1 and steel pipe 2, it is ensured that the edge of the cylinder pin hole 3 does not undergo crushing deformation under pin compression load, thus guaranteeing the hole-shaft fit accuracy.

[0022] Correspondingly, this utility model also provides a drilling hook, specifically including: a boom connecting mechanism having two symmetrically distributed lifting lugs; the welded drilling hook cylinder provided by this utility model, wherein the two cylinder pin holes 3 of the welded drilling hook cylinder are coaxially aligned with the two lifting lugs; the cylinder pin passes through the cylinder pin holes 3 and the lifting lugs, fixing the welded drilling hook cylinder to the boom connecting mechanism; wherein, during operation, the working load is transmitted to the boom connecting mechanism through the cylinder pin, and the stress acting on the welded area of ​​the welded drilling hook cylinder is shared through the cylinder pin holes 3.

[0023] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A welded drilling hook cylinder, characterized in that, include: A steel plate (1) and a steel pipe (2) are provided. A circular through hole is provided at the center of the steel plate (1). The steel pipe (2) is coaxially embedded in the circular through hole and welded to the steel plate (1). Two cylindrical pin holes (3) are symmetrically opened on the combined structure of the steel plate (1) and the steel pipe (2), and: The axes of the two cylinder pin holes (3) are both perpendicular to the axis of the steel pipe (2); The axis of each cylinder pin hole (3) is tangent to the outer wall of the steel pipe (2); Each cylinder pin hole (3) penetrates the side wall of the steel plate (1) and the steel pipe (2); The diameter of each cylinder pin hole (3) is smaller than the sum of the wall thicknesses of the steel plate (1) and the steel pipe (2); The cylinder pin hole (3) is used to insert the cylinder pin to share the load acting on the welding area during operation.

2. The welded drilling hook cylinder according to claim 1, characterized in that, The steel plate (1) and the steel pipe (2) are both made of alloy steel with a yield strength ≥ 500 MPa.

3. The welded drilling hook cylinder according to claim 1, characterized in that, Along the axial direction parallel to the steel pipe (2), the inner wall diameter of the end of the steel pipe (2) away from the steel plate (1) is smaller than the inner wall diameter of the end of the steel pipe (2) close to the steel plate (1).

4. The welded drilling hook cylinder according to claim 1, characterized in that, The steel plate (1) has a rectangular cross-sectional shape.

5. A drilling hook, characterized in that, include: The boom connection mechanism has two symmetrically distributed lifting lugs; The welded drilling hook cylinder body according to any one of claims 1 to 4, wherein the two cylinder pin holes (3) of the welded drilling hook cylinder body are coaxially aligned with the two lifting lugs; A cylinder pin passes through the cylinder pin hole (3) and the lifting lug to fix the welded drilling hook cylinder to the boom connection mechanism; During operation, the working load is transmitted to the boom connection mechanism through the cylinder pin, and the stress acting on the welded area of ​​the welded drilling hook cylinder is shared through the cylinder pin hole (3).

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