Anti-falling device and screw drill

Abstract

The embodiment of the utility model discloses an anti-falling device and a screw drill, and relates to the technical field of anti-falling, the anti-falling device comprises an anti-falling assembly, an anti-falling shaft, an anti-falling chuck, a stator and a rotor; the stator is provided with a shaft hole, and the anti-falling assembly, the anti-falling shaft, the anti-falling chuck and the rotor are all arranged in the shaft hole. The anti-falling shaft penetrates through the anti-falling chuck, one end of the anti-falling shaft is connected with the rotor, and the other end of the anti-falling shaft is connected with the anti-falling assembly; the anti-falling chuck is fixed to the inner side of the shaft hole, and the anti-falling chuck limits the anti-falling assembly. On the basis of limiting between the anti-falling assembly and the anti-falling chuck, the anti-falling device can effectively achieve the anti-falling effect, one shell thread can be omitted, the length of the anti-falling structure can be effectively shortened, and the production cost and the failure risk are reduced.

Description

Technical Field

[0001] This utility model relates to the field of anti-drop technology, and in particular to an anti-drop device and a screw drill bit. Background Technology

[0002] As a core component of downhole power drilling tools, screw drills convert hydraulic energy from drilling fluid into mechanical energy to drive the drill bit rotation. They are widely used in complex well operations such as directional and horizontal wells. With increasing drilling depth and formation complexity, the torque, drilling pressure, and rotational speed that downhole tools must withstand significantly increase. Especially under extreme conditions of high temperature, high pressure, and high vibration, the risk of screw drill casing fracture rises sharply. Once fracture occurs, the entire screw drill will fall into the well, causing not only significant economic losses but also severe delays in the drilling cycle.

[0003] To prevent such accidents, current technical solutions generally add an anti-fall assembly to the upper part of the motor assembly. Its typical structure consists of an anti-fall housing, an anti-fall nut, an anti-fall retaining ring, and an anti-fall shaft. The specific assembly relationship is as follows: the anti-fall housing is connected to the stator via threads, the lower end of the anti-fall shaft is fixed to the rotor via threads, and the upper end is connected in series with the anti-fall retaining ring and the anti-fall nut. While this design can achieve axial anti-falling function, it still has the following technical defects:

[0004] Structural redundancy and reliability risks: The anti-drop housing requires machining connecting threads, leading to an increase in stress concentration areas. Under long-term alternating loads, fatigue fracture can easily occur at the root of the threads, causing the overall anti-drop function to fail.

[0005] Process efficiency constraints: Multi-stage thread assembly requires an increased axial dimension of the housing, which not only increases material consumption but also significantly reduces production cycle time due to the complexity of precision thread machining processes.

[0006] Therefore, there is an urgent need to develop a new anti-drop assembly solution that is compact, highly reliable, and easy to manufacture, in order to meet the dual requirements of modern drilling engineering for tool safety and economy. Utility Model Content

[0007] This utility model provides an anti-drop device and a screw drill bit, aiming to solve at least one technical problem mentioned in the background art.

[0008] To address the aforementioned problems, in a first aspect, this utility model provides an anti-drop device, comprising an anti-drop component, an anti-drop shaft, an anti-drop chuck, a stator, and a rotor; the stator has a shaft hole, and the anti-drop component, anti-drop shaft, anti-drop chuck, and rotor are all disposed within the shaft hole; the anti-drop shaft passes through the anti-drop chuck, one end of the anti-drop shaft is connected to the rotor, and the other end of the anti-drop shaft is connected to the anti-drop component; the anti-drop chuck is fixed to the inner side of the shaft hole, and the anti-drop chuck limits the movement of the anti-drop component.

[0009] A further technical solution is that the anti-fall component includes an anti-fall nut and an anti-fall retaining ring, and a limiting step is provided on the side of the anti-fall shaft; the anti-fall retaining ring is sleeved on the anti-fall shaft and limited by the limiting step; the anti-fall nut is fixed to one end of the anti-fall shaft and limits the anti-fall retaining ring.

[0010] A further technical solution is that the inner diameter of the anti-drop chuck is larger than the outer diameter of the anti-drop shaft and smaller than the outer diameter of the anti-drop retaining ring.

[0011] A further technical solution is that the stator includes a housing and an anti-drop ring, the shaft hole is formed on the housing, and the anti-drop ring is fixed on the inner wall of the shaft hole.

[0012] A further technical solution is that the anti-drop disc is installed on the anti-drop ring.

[0013] A further technical solution is that the anti-drop ring is welded to the inner wall of the shaft hole.

[0014] A further technical solution is that the anti-drop device also includes a limiting member, which is fixed on the inner wall of the shaft hole and located on the side of the anti-drop chuck close to the anti-drop component.

[0015] A further technical solution is that the limiting member is a hole elastic retaining ring, the inner wall of the shaft hole is provided with a groove, the hole elastic retaining ring is embedded in the groove, and the hole elastic retaining ring limits the anti-drop chuck.

[0016] A further technical solution is that the stator also includes a rubber sleeve, which is embedded in the shaft hole and wraps around the outside of the rotor.

[0017] Secondly, this utility model provides a screw drill tool, which includes the anti-drop device as described in the first aspect.

[0018] Compared with the prior art, the technical effects achieved by the embodiments of this utility model include:

[0019] This utility model embodiment proposes an anti-drop device, which includes an anti-drop component, an anti-drop shaft, an anti-drop chuck, a stator, and a rotor. The stator has a shaft hole, and the anti-drop component, anti-drop shaft, anti-drop chuck, and rotor are all disposed within the shaft hole. The anti-drop shaft passes through the anti-drop chuck, with one end connected to the rotor and the other end connected to the anti-drop component. The anti-drop chuck is fixed inside the shaft hole and provides a limiting position for the anti-drop component. Based on the limiting position between the anti-drop component and the anti-drop chuck, the anti-drop device can effectively prevent drops and reduces one housing thread, effectively shortening the length of the anti-drop structure, reducing production costs and the risk of failure. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 This is a cross-sectional view of an anti-fall device proposed in an embodiment of the present invention.

[0024] Figure Labels

[0025] Anti-drop component 10, anti-drop shaft 20, anti-drop chuck 30, stator 40, rotor 50, limiting component 60, anti-drop nut 11, anti-drop retaining ring 12, limiting step 21, housing 41, anti-drop retaining ring 42, rubber sleeve 43. Detailed Implementation

[0026] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Similar component reference numerals in the drawings represent similar components. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification of embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the present invention. As used in this specification of embodiments of the present invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] See Figure 1 This utility model embodiment proposes an anti-drop device. Based on the limiting relationship between the anti-drop component 10 and the anti-drop chuck 30, the anti-drop device effectively prevents falling and reduces one housing thread, thus shortening the length of the anti-drop structure and reducing production costs and failure risk. To achieve the above technical objectives, the anti-drop device includes an anti-drop component 10, an anti-drop shaft 20, an anti-drop chuck 30, a stator 40, and a rotor 50, the specific structure of which is described below:

[0030] The stator 40 is provided with a shaft hole, and the anti-drop component 10, anti-drop shaft 20, anti-drop chuck 30 and rotor 50 are all disposed in the shaft hole; the anti-drop shaft 20 passes through the anti-drop chuck 30, one end of the anti-drop shaft 20 is connected to the rotor 50 (for example, by threaded connection, which is not specifically limited in this utility model), and the other end of the anti-drop shaft 20 is connected to the anti-drop component 10; the anti-drop chuck 30 is fixed to the inner side of the shaft hole, and the anti-drop chuck 30 forms a limit on the anti-drop component 10.

[0031] Specifically, this anti-drop device, through the limiting cooperation between the anti-drop component 10 and the anti-drop chuck 30, not only improves the reliability of the anti-drop function, but also significantly optimizes the structural design and production cost, which is reflected in the following three aspects:

[0032] 1. Enhanced anti-drop performance

[0033] The limiting interface between the anti-drop component 10 and the anti-drop chuck 30 adopts a stepped limiting design, forming a mechanical stop structure. When the screw drill bit rotates at high speed, the vibration of the anti-drop shaft caused by centrifugal inertial force is reduced compared with the typical anti-drop assembly structure. The risk of fatigue fracture failure due to local stress concentration in the threaded connection is reduced, effectively ensuring the safety of downhole operations.

[0034] 2. Simplified structure and improved reliability

[0035] By eliminating the threaded connection section of the original anti-drop housing, the risk of failure caused by vibration loosening and corrosion wear of the threaded pair is completely eliminated. The improved structure is shorter, reducing material usage, and the elimination of precision thread machining processes significantly improves the manufacturing yield of the anti-drop assembly.

[0036] 3. Cost and efficiency optimization

[0037] The compact design reduces overall weight, alleviating the burden of transportation and installation in the well, while also lowering costs. Furthermore, the simplified structure facilitates maintenance and improves efficiency.

[0038] In summary, this design achieves synergistic optimization among anti-drop performance, process reliability, and economy through structural innovation, providing a more competitive solution for high-performance drilling tools.

[0039] This utility model embodiment proposes an anti-drop device, which includes an anti-drop component 10, an anti-drop shaft 20, an anti-drop chuck 30, a stator 40, and a rotor 50. The stator 40 has a shaft hole, and the anti-drop component 10, anti-drop shaft 20, anti-drop chuck 30, and rotor 50 are all disposed within the shaft hole. The anti-drop shaft 20 passes through the anti-drop chuck 30, with one end connected to the rotor 50 and the other end connected to the anti-drop component 10. The anti-drop chuck 30 is fixed to the inner side of the shaft hole, and the anti-drop chuck 30 forms a limiting position on the anti-drop component 10. Based on the limiting position between the anti-drop component 10 and the anti-drop chuck 30, the anti-drop device can effectively prevent falling, and can reduce one thread, effectively shorten the length of the anti-drop structure, and reduce production costs and failure risk.

[0040] Furthermore, in some embodiments, such as this embodiment, the anti-drop component 10 includes an anti-drop nut 11 and an anti-drop retaining ring 12, and the side of the anti-drop shaft 20 is provided with a limiting step 21; the anti-drop retaining ring 12 is sleeved on the anti-drop shaft 20 and is limited by the limiting step 21; the anti-drop nut 11 is fixed to one end of the anti-drop shaft 20 and limits the anti-drop retaining ring 12.

[0041] Specifically, the outer diameter of the limiting step 21 is larger than the inner diameter of the anti-drop retaining ring 12, thereby limiting the anti-drop retaining ring 12. The anti-drop nut 11 can be threadedly connected to the anti-drop shaft 20. The outer diameter of the anti-drop nut 11 is larger than the inner diameter of the anti-drop retaining ring 12, and the anti-drop retaining ring 12 is pressed and fixed on the limiting step 21 by the anti-drop nut 11.

[0042] Furthermore, the inner diameter of the anti-drop chuck 30 is larger than the outer diameter of the anti-drop shaft 20 and smaller than the outer diameter of the anti-drop retaining ring 12, so that the anti-drop chuck 30 can limit the anti-drop retaining ring 12, that is, the anti-drop retaining ring 12 cannot pass through the anti-drop chuck 30.

[0043] Furthermore, in some embodiments, such as this embodiment, the stator 40 includes a housing 41 and an anti-drop ring 42, the shaft hole is formed on the housing 41, and the anti-drop ring 42 is fixed on the inner wall of the shaft hole.

[0044] Specifically, the anti-drop ring 42 is welded to the inner wall of the shaft hole to achieve reliable fixation.

[0045] Furthermore, the anti-drop chuck 30 is mounted on the anti-drop chuck 42. For example, the anti-drop chuck 30 can be mounted on the anti-drop chuck 42 by means of fasteners and / or buckles, etc. This utility model does not specifically limit this.

[0046] Furthermore, in some embodiments, such as this embodiment, the anti-drop device further includes a limiting member 60, which is fixed on the inner wall of the shaft hole and located on the side of the anti-drop chuck 30 near the anti-drop assembly 10.

[0047] The limiting member 60 can reliably limit the anti-drop chuck 30, preventing it from moving around, thereby greatly improving the reliability of fixing the anti-drop chuck 30.

[0048] Specifically, in some embodiments, such as this embodiment, the limiting member 60 is a retaining ring for a hole. The inner wall of the shaft hole is provided with a groove, and the retaining ring for the hole is embedded in the groove. The retaining ring for the hole limits the anti-drop chuck 30. It can be understood that the anti-drop shaft 20 passes through the retaining ring for the hole, and the retaining ring for the hole is fixedly disposed on one side of the anti-drop chuck 30 to limit the anti-drop chuck 30.

[0049] A retaining ring for holes is a flexible fixing element used in mechanical assembly. It is mainly used to axially fix a chuck 30 installed in a shaft hole to prevent it from moving axially. The retaining ring is installed in a pre-machined groove in the shaft hole and is securely fixed by elastic tension.

[0050] Furthermore, in some embodiments, such as this embodiment, the stator 40 further includes a rubber sleeve 43, which is embedded in the shaft hole and wraps around the outside of the rotor 50. The rubber sleeve 43 can reliably protect the rotor 50 and improve its service life.

[0051] This utility model provides a screw drill, which includes the anti-drop device described in any of the above embodiments.

[0052] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0053] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 this utility model.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0058] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Since these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

[0059] The above description describes specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A fall-preventing device, characterized in that The anti-falling device comprises an anti-falling assembly, an anti-falling shaft, an anti-falling chuck, a stator and a rotor; the stator is provided with a shaft hole, the anti-falling assembly, the anti-falling shaft, the anti-falling chuck and the rotor are arranged in the shaft hole; the anti-falling shaft passes through the anti-falling chuck, one end of the anti-falling shaft is connected with the rotor, and the other end of the anti-falling shaft is connected with the anti-falling assembly; the anti-falling chuck is fixed to the inner side of the shaft hole, and the anti-falling chuck forms a limiting position for the anti-falling assembly; The anti-falling device further comprises a limiting piece, which is fixed to the inner wall of the shaft hole and located on the side of the anti-falling chuck close to the anti-falling assembly. The limiting piece is a hole elastic stopper, the inner wall of the shaft hole is provided with a groove, and the hole elastic stopper is embedded in the groove, thereby limiting the anti-falling chuck.

2. The fall-prevention device according to claim 1, characterized in that The anti-falling assembly comprises an anti-falling nut and an anti-falling stopper, and the side surface of the anti-falling shaft is provided with a limiting step; the anti-falling stopper is sleeved on the anti-falling shaft and limited by the limiting step; the anti-falling nut is fixed to one end of the anti-falling shaft and limits the anti-falling stopper.

3. The fall-prevention device according to claim 2, characterized in that The inner hole diameter of the anti-falling chuck is greater than the outer diameter of the anti-falling shaft and smaller than the outer diameter of the anti-falling stopper.

4. The fall-prevention device according to claim 2, characterized in that The stator comprises a shell and an anti-falling ring, the shaft hole is arranged on the shell, and the anti-falling ring is fixed to the inner wall of the shaft hole.

5. The fall arrest device of claim 4, wherein, The anti-falling chuck is installed on the anti-falling ring.

6. The fall-prevention device according to claim 4, characterized in that The anti-falling ring is welded with the inner wall of the shaft hole.

7. The fall-prevention device according to claim 4, characterized in that The stator further comprises a rubber sleeve, which is embedded in the shaft hole and wrapped on the outer side of the rotor.

8. A screw drill, characterized by The anti-falling device comprises the anti-falling device according to any one of claims 1-7.

Images