Integral type cardan shaft for screw drill and screw drill applying integral type cardan shaft

Abstract

The utility model discloses an integral cardan shaft for screw drill and the screw drill applying the same, the cardan shaft comprises a rotor connecting part, a transmission shaft connecting part and a universal connecting rod, the two ends of the universal connecting rod are respectively inserted into the rotor connecting part and the transmission shaft connecting part; sealing connecting assemblies are arranged between the two ends of the universal connecting rod and the rotor connecting part and between the two ends of the universal connecting rod and the transmission shaft connecting part. According to the integral type universal shaft for the screw drill and the screw drill applying the integral type universal shaft, a universal head and a connecting rod of a traditional structure are made into a whole through the universal connecting rod, a movable hinge and a universal head base are made into a whole through the rotor connecting part, and a connected water cap and the universal head base are made into a whole through the transmission shaft connecting part, so that the integral type universal shaft is simple in structure, convenient to use and high in practicability. The number of parts is small, assembly is convenient, after downhole operation, the abrasion condition of the parts can be effectively reduced, the service life is prolonged, frequent replacement of the parts is prevented, the drilling efficiency is improved, and the drilling cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum drilling tools, in particular to an integral universal shaft for a screw drilling tool and the screw drilling tool using the same. Background Art

[0002] Screw drill bits are commonly used downhole power tools in the process of oil and gas drilling. During the drilling operation, the function of the universal joint is to transmit the speed and torque generated by the motor to the transmission shaft, and then transmit the speed and torque to the drill bit through the transmission shaft.

[0003] With the continuous development of technology and the continuous improvement of drilling requirements, high-speed and high-torque drilling tools have become iconic drilling tools. However, in modern drilling projects, the universal shafts used are mostly split structures with complex parts. In the actual working process, due to the continuous increase in speed and torque, the separation of the shaft is prone to wear, and it is necessary to regularly raise and lower the drill bit to replace the worn parts, which increases the drilling cost and reduces the drilling efficiency. Utility Model Content

[0004] Therefore, one purpose of the utility model is to provide an integral universal shaft for a screw drill and a screw drill using the same, so as to solve the problems mentioned in the background technology and overcome the deficiencies in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An integral universal shaft for a screw drill comprises a rotor connection part, a transmission shaft connection part and a universal connecting rod, wherein two ends of the universal connecting rod are respectively inserted into the inside of the rotor connection part and the transmission shaft connection part, and a sealing connection assembly is provided between the two ends of the universal connecting rod and the rotor connection part and the transmission shaft connection part.

[0007] Furthermore, the universal connecting rod includes a connecting shaft and a universal head, the connecting shaft and the universal head are integrated, the universal head includes a first universal head and a second universal head, and the first universal head and the second universal head are respectively arranged at two ends of the connecting shaft.

[0008] Furthermore, the sealing connection assembly includes a first sealing connection assembly and a second sealing connection assembly.

[0009] Furthermore, one end of the universal connecting rod is connected to the rotor connecting part through a first sealing connection assembly, and the rotor connecting part includes a living hinge and a first universal head seat, and the living hinge and the first universal head seat are integrated.

[0010] Furthermore, the other end of the universal connecting rod is connected to the transmission shaft connecting part through a second sealing connection assembly, and the transmission shaft connecting part includes a one-piece water cap and a second universal head seat, and the one-piece water cap and the second universal head seat are integrated.

[0011] Furthermore, the first sealing connection assembly includes a locking sleeve and a sealing sleeve, the locking sleeve includes an inner locking sleeve and an outer locking sleeve, one end of the sealing sleeve is clamped between the inner locking sleeve and the outer locking sleeve, and a stainless steel cable tie is provided at one end of the sealing sleeve away from the locking sleeve.

[0012] Furthermore, the universal head includes a side spherical surface and an end plane, a ball seat is provided on the end plane, and a steel ball is installed on the ball seat.

[0013] Furthermore, both ends of the universal connecting rod, the interior of the rotor connecting part, and the interior of the transmission shaft connecting part are all subjected to surface nitriding treatment.

[0014] The utility model also provides a screw drill, including the above-mentioned integral universal shaft for the screw drill, and also including a motor and a transmission shaft, the rotor of the motor is connected to the rotor connecting part of the integral universal shaft, and the transmission shaft is connected to the transmission shaft connecting part of the integral universal shaft.

[0015] Therefore, the utility model has the following beneficial effects:

[0016] The utility model discloses an integral universal shaft for a screw drill and a screw drill using the same. The universal connecting rod makes the universal head and the connecting rod of the traditional structure into a whole, the rotor connecting part makes the living hinge and the universal head seat into a whole, and the transmission shaft connecting part makes the one-piece water cap and the universal head seat into a whole. The structure is simple, the number of parts is small, and the assembly is convenient. After the downhole operation, the wear of the parts can be effectively reduced, the service life can be extended, the frequent replacement of parts can be prevented, the drilling efficiency can be improved, and the drilling cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of an integral universal shaft for a screw drill tool of the utility model;

[0018] Figure 2 It is a split view of each part of an integral universal shaft for a screw drill tool of the utility model;

[0019] Figure 3 It is an enlarged structural diagram of the first sealing connection component of the utility model.

[0020] In the figure: A, rotor connection; B, universal connecting rod; C, transmission shaft connection; D, first sealing connection assembly; 1, connecting shaft; 2, first universal head; 3, second universal head; 4, living hinge; 5, first universal head seat; 6, one-piece water cap; 7, second universal head seat; 8, inner locking sleeve; 9, outer locking sleeve; 10, sealing sleeve; 11, stainless steel cable tie; 12, steel ball; 13, ball seat; 14, end plane; 15, side spherical surface; 16, first head seat; 17, second head seat; 18, first boss; 19, second boss; 20, rubber sealing ring. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figure 1 and Figure 2 An integral universal shaft for a screw drill tool is shown, comprising a rotor connection part A, a transmission shaft connection part C and a universal connecting rod B, the two ends of the universal connecting rod B are respectively inserted into the interior of the rotor connection part A and the transmission shaft connection part C, and a sealing connection assembly is provided between the two ends of the universal connecting rod B and the rotor connection part A and the transmission shaft connection part C.

[0024] The utility model discloses an integral universal shaft for a screw drill and a screw drill using the same. The universal connecting rod B makes the universal head and the connecting rod of the traditional structure into a whole, the rotor connecting part A makes the living hinge 4 and the universal head seat into a whole, and the transmission shaft connecting part C makes the one-piece water cap 6 and the universal head seat into a whole. The utility model has a simple structure, a small number of parts, and is easy to assemble. After the downhole operation, the wear of the parts can be effectively reduced, the service life can be extended, the frequent replacement of parts can be prevented, the drilling efficiency can be improved, and the drilling cost can be reduced.

[0025] like Figure 1 and Figure 2As shown, the universal connecting rod B includes a connecting shaft 1 and a universal head. The connecting shaft 1 and the universal head are integrated. The universal head includes a first universal head 2 and a second universal head 3. The first universal head 2 and the second universal head 3 are respectively arranged at both ends of the connecting shaft 1.

[0026] like Figure 2 As shown, a first boss 18 and a second boss 19 are provided on the connecting shaft 1 of the universal connecting rod B near the first universal head 2 and the second universal head 3. The first boss 18 and the second boss 19 are arranged around the connecting shaft 1. The first boss 18 and the second boss 19 are used to cooperate with the sealing connection assembly.

[0027] Specifically, the sealing connection assembly includes a first sealing connection assembly D and a second sealing connection assembly.

[0028] Furthermore, one end of the universal connecting rod B is connected to the rotor connecting part A through a first sealing connection assembly D. The rotor connecting part A includes a living hinge 4 and a first universal head seat 5. The living hinge 4 and the first universal head seat 5 are integrated.

[0029] A first head seat 16 is provided inside the rotor connection part A, at the connection between the living hinge 4 and the first universal head seat 5. The first head seat 16 is an inwardly concave spherical surface, which cooperates with the side surface (side spherical surface 15) of the first universal head 2. When the first universal head seat 5 of the universal connecting rod B is inserted into the interior of the rotor connection part A, the side surface (side spherical surface 15) of the first universal head 2 can just fit with the first head seat 16.

[0030] Furthermore, the other end of the universal connecting rod B is connected to the transmission shaft connecting part C through a second sealing connection assembly. The transmission shaft connecting part C includes a one-piece water cap 6 and a second universal head seat 7. The one-piece water cap 6 and the second universal head seat 7 are integrated.

[0031] A second head seat 17 is provided inside the transmission shaft connection part C and at the connection between the one-piece water cap 6 and the second universal head seat 7. The second head seat 17 is also a spherical surface recessed inwardly, which cooperates with the side surface (side spherical surface 15) of the second universal head 3. When the second universal head seat 7 of the universal connecting rod B is inserted into the interior of the transmission shaft connection part C, the side surface (side spherical surface 15) of the second universal head 3 can just fit with the second head seat 17.

[0032] like Figure 2 and Figure 3 As shown, the first sealing connection assembly D includes a locking sleeve and a sealing sleeve 10, the locking sleeve includes an inner locking sleeve 8 and an outer locking sleeve 9, one end of the sealing sleeve 10 is clamped in the middle by the inner locking sleeve 8 and the outer locking sleeve 9, and a stainless steel cable tie 11 is provided at the end of the sealing sleeve 10 away from the locking sleeve.

[0033] A rubber sealing ring 20 is provided at the connection between the outer locking sleeve 9 and the first universal head seat 5 .

[0034] like Figure 3 As shown, the inner locking sleeve 8 is an annular sleeve with a convex cross-section, the upper and lower edges of the cross-section of the sealing sleeve 10 are in a streamlined shape, the outer locking sleeve 9 and the inner locking sleeve 8 tightly clamp one end (a part) of the sealing sleeve 10 in the middle, and the other end of the sealing sleeve 10 is tightly clamped on the connecting shaft 1 by a stainless steel cable tie 11, thereby realizing the connection and sealing between the rotor connecting part A and one end of the universal connecting rod B, and the other end of the universal connecting rod B and the transmission shaft connecting part C.

[0035] like Figure 1 As shown, the end surface of the other end of the sealing sleeve 10 in the first sealing connection assembly D is pressed against the first boss 18 of the connecting shaft 1. The end surface of the other end of the sealing sleeve 10 in the second sealing connection assembly is pressed against the second boss 19 of the connecting shaft 1. The boss cooperates with the sealing sleeve 10 to play a role of fixing and limiting.

[0036] As an implementation manner, the first sealing connection component D is sleeved on the connecting shaft 1 and the first sealing connection component D and the connecting shaft 1 can rotate relative to each other.

[0037] As an implementation manner, the first sealing connection component D is sleeved on the connecting shaft 1 and the first sealing connection component D and the first universal head seat 5 can rotate relatively.

[0038] The second sealing connection assembly has the same structure and function as the first sealing connection assembly D. The difference is that the first sealing connection assembly D is used to realize the connection and sealing between the rotor connection part A and one end of the universal connecting rod B (the end where the first universal head 2 is located), and the second sealing connection assembly is used to realize the connection and sealing between the other end of the universal connecting rod B (the end where the second universal head 3 is located) and the transmission shaft connection part C. The structure and function of the second sealing connection assembly will not be repeated here.

[0039] like Figure 2 As shown, the universal head includes a side spherical surface 15 and an end plane 14 . A ball seat 13 is provided on the end plane 14 , and a steel ball 12 is mounted on the ball seat 13 .

[0040] Specifically, the outer side surface of the universal head (the first universal head 2 and the second universal head 3) away from the connecting shaft 1 is a spherical surface, and the end plane 14 connecting the universal head to the connecting shaft 1 is similar to the side surface of a cylinder. The end plane 14 is actually a curved surface, which is arranged around the axial direction of the universal head. A ball seat 13 is arranged on the end plane 14, and the ball seat 13 is used to accommodate the installation of the steel ball 12.

[0041] As an implementation manner, two ball seats 13 are provided on the first universal head 2 . The two ball seats 13 are arranged oppositely on the end planes 14 on both sides of the first universal head 2 . Each ball seat 13 accommodates and installs a steel ball 12 .

[0042] As an implementation mode, three ball seats 13 are provided on the first universal head 2 , and the three ball seats 13 are evenly arranged on the end plane 14 of the first universal head 2 . The connecting line of the three ball seats 13 forms an equilateral triangle, and each ball seat 13 accommodates and installs a steel ball 12 .

[0043] As an implementation mode, four ball seats 13 are provided on the first universal head 2 , and the four ball seats 13 are evenly arranged on the end plane 14 of the first universal head 2 . The lines connecting the four ball seats 13 as vertices form a square, and each ball seat 13 accommodates and installs a steel ball 12 .

[0044] Furthermore, both ends of the universal connecting rod B, the interior of the rotor connecting part A, and the interior of the transmission shaft connecting part C are subjected to surface nitriding treatment.

[0045] Specifically, the side spherical surfaces 15 (outer surfaces) of the universal heads (the first universal head 2 and the second universal head 3) are subjected to surface nitriding treatment, and the first head seat 16 and the second head seat 17 are subjected to surface nitriding treatment.

[0046] As an embodiment, the surface of the steel ball 12 is subjected to a surface nitriding treatment.

[0047] The utility model is a universal shaft with an integral structure, in which the universal head and the connecting rod of the traditional structure are made into an integral whole, and the movable hinge 4 and the one-piece water cap 6 are respectively made into an integral whole with the universal head seat. It has a simple structure and is easy to assemble. After the downhole operation, the wear of the parts can be effectively reduced, the service life is long, and the shortcomings and deficiencies existing in the prior art are effectively reduced, and the frequent replacement of parts is prevented, and the drilling cost is reduced.

[0048] During the drilling operation, the universal shaft converts the planetary motion of the rotor connected to the live hinge 4 into the fixed axis motion of the transmission shaft connected to the one-piece water cap 6. At this time, the head ball (first universal head 2 and second universal head 3) of the connecting shaft 1 will produce friction with the live hinge 4 and the inner arc inner hole (first head seat 16 and second head seat 17) of the one-piece water cap 6. Because these two parts are surface nitrided during processing, the overall material hardness is high, and the durability of the parts is also increased. This reduces the replacement of parts, greatly reduces production costs, and also improves the work efficiency of drilling operations.

[0049] The utility model also provides a screw drill, including the above-mentioned integral universal shaft for the screw drill, and also including a motor and a transmission shaft, the rotor of the motor is connected to the rotor connection part A of the integral universal shaft, and the transmission shaft is connected to the transmission shaft connection part C of the integral universal shaft.

[0050] Specifically, the screw drill includes a bypass valve assembly, an anti-drop assembly, a motor assembly, a universal shaft, a transmission shaft assembly and a drill bit. The function of the universal shaft assembly is to convert the planetary motion of the motor into the fixed axis motion of the transmission shaft, and transmit the torque and speed generated by the motor to the transmission shaft to the drill bit.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] It is not difficult for those skilled in the art to understand that the utility model includes any combination of the utility model content and the specific implementation method part of the above specification and the various parts shown in the drawings. Due to the limited space and to make the specification concise, the various schemes composed of these combinations are not described one by one. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0053] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integral universal shaft for a screw drill, characterized in that: It includes a rotor connection part, a transmission shaft connection part and a universal connecting rod, wherein two ends of the universal connecting rod are respectively inserted into the inside of the rotor connection part and the transmission shaft connection part, and a sealing connection assembly is provided between the two ends of the universal connecting rod and the rotor connection part and the transmission shaft connection part.

2. The integral universal shaft for a screw drill according to claim 1, characterized in that: The universal connecting rod comprises a connecting shaft and a universal head, wherein the connecting shaft and the universal head are integrated, and the universal head comprises a first universal head and a second universal head, wherein the first universal head and the second universal head are respectively arranged at two ends of the connecting shaft.

3. The integral universal shaft for a screw drill according to claim 2, characterized in that: The sealed connection assembly includes a first sealed connection assembly and a second sealed connection assembly.

4. The integral universal shaft for a screw drill according to claim 3, characterized in that: One end of the universal connecting rod is connected to the rotor connecting part through a first sealing connection assembly. The rotor connecting part includes a living hinge and a first universal head seat. The living hinge and the first universal head seat are integrated.

5. The integral universal shaft for a screw drill according to claim 3, characterized in that: The other end of the universal connecting rod is connected to the transmission shaft connecting part through a second sealing connection assembly. The transmission shaft connecting part includes a one-piece water cap and a second universal head seat. The one-piece water cap and the second universal head seat are integrated.

6. An integral universal shaft for a screw drill according to any one of claims 3 to 5, characterized in that: The first sealing connection assembly includes a locking sleeve and a sealing sleeve, the locking sleeve includes an inner locking sleeve and an outer locking sleeve, one end of the sealing sleeve is clamped between the inner locking sleeve and the outer locking sleeve, and a stainless steel cable tie is provided at one end of the sealing sleeve away from the locking sleeve.

7. An integral universal shaft for a screw drill according to any one of claims 2 to 5, characterized in that: The universal head comprises a side spherical surface and an end plane, a ball seat is arranged on the end plane, and a steel ball is mounted on the ball seat.

8. The integral universal shaft for a screw drill according to claim 1, characterized in that: Both ends of the universal connecting rod, the interior of the rotor connecting part, and the interior of the transmission shaft connecting part are subjected to surface nitriding treatment.

9. A screw drill, comprising an integral universal shaft for a screw drill according to any one of claims 1 to 8, characterized in that: It also includes a motor and a transmission shaft, wherein the rotor of the motor is connected to the rotor connecting portion of the integral universal shaft, and the transmission shaft is connected to the transmission shaft connecting portion of the integral universal shaft.

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