Protective cap screwer

Abstract

The present invention discloses a cap screwing device, which comprises: a power wrench, a nut friction column, a rotating body, a friction cone disc, and a lever jaw. The output shaft of the power wrench is key-connected with the nut friction column, the nut friction column is threadedly connected with the rotating body, the friction cone disc is cylindrically connected with the nut friction column, at least three lever jaws are arranged on the outer circumference of the rotating body, and the bottom moving end of the lever jaw can move along the outer conical surface of the friction cone disc under the action of the power wrench. The present invention uses a power wrench as the drive, realizes clamping by using the lever jaw, and adopts the cooperative connection among the nut friction column, the rotating body, and the friction cone disc to realize force amplification by the thread pair and torque transmission by the friction pair, so that the bottom moving end of the lever jaw can move along the outer conical surface of the friction cone disc under the action of the power wrench, thereby enabling the tooth part of the lever jaw to clamp the cap, realizing the rapid unscrewing of the cap, improving the casing running efficiency, and being beneficial to the market promotion and application.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling equipment, and particularly to a cap spinner. Background Art

[0002] Before the operation of running casing in oil drilling, the casing is horizontally placed on the truss in the yard. It is necessary to unscrew the cap protecting the external thread at one end of each casing, apply oil to the thread and then screw on the cap again before lifting it to the wellhead for casing running operation. However, it is not easy to unscrew the casing cap. In some cases, the thread of the casing is rusted or the cap is deformed due to impact, making it difficult to unscrew the cap. Currently, for caps that are not easily unscrewed, the general practice of the operator is to tap the cap with a hammer to loosen it and unscrew it, or directly damage the cap. However, tapping with a hammer often causes damage to the thread, and even leads to the scrapping of the casing, which not only affects the drilling efficiency but also causes economic losses to the drilling project. Summary of the Invention

[0003] The present invention proposes a cap spinner for one or more of the above existing problems.

[0004] According to one aspect of the present invention, there is provided a cap spinner, comprising: a power wrench, a rotary body, a nut friction column, a friction cone disk, and a lever jaw. The output shaft of the power wrench and the nut friction column are connected by a keyway connection. The nut friction column and the friction cone disk are cylindrically connected. The nut friction column and the rotary body are connected by a thread pair. At least three lever jaws are provided along the outer circumference of the rotary body. The bottom moving end of the lever jaw can move along the outer conical surface of the friction cone disk under the action of the power wrench, so that the tooth part of the lever jaw clamps the cap.

[0005] In some realizable ways, a stud for mating connection with the thread friction column is provided at the center of the rotary body, and at least two slots for mating connection with the friction cone disk are symmetrically provided on the upper surface of the rotary body centered on its center.

[0006] In some realizable ways, the friction cone disk includes a frustum with a narrow upper part and a wide lower part. A first through hole is provided at the center of the frustum. The outer side surface of the frustum is an outer conical surface, and the inner side wall of the frustum is a rough surface. The friction cone disk is connected to the nut friction column through the first through hole, and a key for mating with the slot of the rotary body is also provided on the outer circumference of the friction cone disk.

[0007] In some realizable ways, at least three slotted holes are equidistantly provided along the circumference of the rotary body. An ear seat for the slotted hole is provided in each slotted hole. Each ear seat for the slotted hole includes a first ear seat and a second ear seat. A shaft hole is provided at the center of each of the first ear seat and the second ear seat. The corresponding holes on each ear seat for the slotted hole are connected to the lever jaw through a first pin shaft.

[0008] In some implementable ways, the nut friction post includes a connecting post and a friction disc. A square hole groove connected to the output shaft of the power wrench is provided at the center of the connecting post. The square hole groove penetrates to the bottom of the connecting post. An internal thread that mates with the stud on the rotating body is provided in the square hole groove. The outer side surface of the friction disc is a rough surface. The outer side surface of the friction disc is in close contact with the rotating body during operation to transmit torque.

[0009] In some implementable ways, a connecting hole is provided on the lever jaw. The first pin shaft is connected to the shaft hole on the slotted hole ear seat through the connecting hole.

[0010] In some implementable ways, limit bumps are provided on both sides of the bottom of the slotted hole of the rotating body. The lever jaw includes a jaw and a connecting part that are fixedly connected. A tooth surface is provided on the inner side surface of the jaw. A limit hole is also provided on the jaw. The limit hole is used to place an elastic pin. The elastic pin is in close contact with the limit bump in the non-use state to limit the lever jaw.

[0011] In some implementable ways, an anti-seize component is further included. The anti-seize component includes a locking screw and a slider. A groove is also provided on the lever jaw. A screw hole is provided at the top of the groove. The slider is placed in the groove. The locking screw is in direct contact with the slider through the screw hole. A semi-cylindrical hole that mates with the first pin shaft is provided at the bottom of the slider.

[0012] In some implementable ways, a spring and a second pin shaft are further included. A first hole is provided in the connecting part. Second holes for placing the spring are evenly provided on the rotating body. The second pin shaft penetrates through the inside of the spring to connect the first hole and the second hole.

[0013] The beneficial effects of the present invention are:

[0014] The cap spinner provided by the present invention has a simple and unique structure and reliable performance. It uses a power wrench as the drive, uses a lever jaw to achieve clamping, and uses the cooperation connection between the nut friction post, the rotating body, and the friction cone disc to achieve force amplification using a thread pair and torque transmission using a friction pair. The bottom moving end of the lever jaw can move along the outer conical surface of the friction cone disc under the action of the power wrench, and the tooth part of the lever jaw clamps the cap, thereby completing the entire process of removing the buckle. Thus, rapid removal of the cap is achieved, the efficiency of casing running is improved, and it is conducive to market promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of a cap spinner;

[0016] Figure 2 is a cross-sectional schematic diagram of a cap spinner;

[0017] Figure 3 is Figure 2 the enlarged schematic diagram of I in

[0018] Figure 4 It is a schematic structural diagram of a slider in a cap screwing device.

[0019] Figure 5 It is a schematic structural diagram of a rotating body of a cap screwing device.

[0020] Figure 6 It is a schematic structural diagram of a rotating body of a cap screwing device from another angle.

[0021] Figure 7 It is a schematic structural diagram of a nut friction column of a cap screwing device.

[0022] Figure 8 It is a schematic structural diagram of a nut friction column of a cap screwing device from another angle.

[0023] Figure 9 It is a schematic structural diagram of a friction cone disc of a cap screwing device.

[0024] Figure 10 It is a schematic structural diagram of a friction cone disc of a cap screwing device from another angle.

[0025] Figure 11 It is a partial schematic structural diagram of a lever jaw of a cap screwing device.

[0026] Figure 12 It is a partial schematic structural diagram of a lever jaw of a cap screwing device from another angle.

[0027] Figure 13 It is a schematic explosion structure diagram of a cap screwing device. Detailed implementation manners

[0028] The technical solution of the application will be further described in detail below with reference to the accompanying drawings.

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art belonging to the technical field of the present invention. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0032] Embodiment 1

[0033] As Figure 1 and Figure 13 shown, the present invention provides a cap spanner, which mainly consists of a power wrench 1, a rotating body 2, a nut friction column 3, a friction cone disc 4, a lever jaw 7, a spring 5, an anti-seize component 6, a protective cover 8 and other components. Among them, the power wrench 1 can be a pneumatic wrench, a hydraulic wrench or a pneumatic wrench. The output shaft of the power wrench 1 is connected to the nut friction column 3 through a key. The nut friction column 3 is connected to the rotating body 2 by a thread pair. The friction cone disc 4 is assembled on the outer circumference of the nut friction column 3 through an inner hole. The protective cover is fixed on the power wrench to ensure the safety of the user. At least three lever jaws 7 are arranged in the circumferential direction of the rotating body. The lever jaws 7 are used to clamp the cap. The bottom moving end of the lever jaw can move along the outer conical surface 41 of the friction cone disc under the action of the power wrench, so as to clamp the cap with the tooth part. The structure of the present invention is novel. It uses a power wrench as the drive, realizes clamping by using lever jaws, and uses the cooperation between the nut friction column 3, the rotating body 2 and the friction cone disc 4 to increase the force by using the thread pair and transfer the torque by using the friction pair to realize the whole process of unfastening the buckle.

[0034] As Figure 2 shown, a stud 21 for mating connection with the thread friction column 3 is arranged at the center of the rotating body. At least two card slots 23 for mating connection with the friction cone disc 4 are symmetrically arranged on the upper surface of the rotating body 2 centered on its center. At least three slotted holes are arranged at equal intervals along the outer circumference of the rotating body. Each slotted hole is provided with a slotted hole ear seat 22. Each slotted hole ear seat 22 includes a first ear seat and a second ear seat. Axial holes are opened at the centers of the first ear seat and the second ear seat. The corresponding axial holes on each slotted hole ear seat are connected to the lever jaw 7 through a first pin shaft 9.

[0035] A connection hole 75 is also arranged on the lever jaw 7. The first pin shaft 9 is connected to the axial hole on the slotted hole ear seat through the connection hole 75. As shown in the figure, three second holes 25 are evenly distributed on the rotating body for connecting the spring 5. There is a support flange 24 on the rotating body for connecting the power wrench 1.

[0036] As Figure 1 and Figure 6 shown, limit bumps 26 are arranged on both sides of the bottom of the slotted hole of the rotating body 2. The lever jaw 7 includes a fixedly connected jaw and a connecting part. A first hole 73 is arranged on the connecting part. One end of the connecting part in contact with the friction cone disc is an arc surface 74. As Figure 11 and12 As shown in the figure, the inner side of the jaw is provided with a tooth surface 71. The tooth surface is provided to increase the frictional force to hold the protective cap. The jaw is also provided with a limiting hole 72. The limiting hole 72 is used to place the elastic pin 10. When the elastic pin 10 is in a non-use state, it is in close contact with the limiting convex block 26 to limit the lever jaw 7, so that the protective cap can be smoothly held when the protective cap screwing device starts to work. In addition, this structure also includes a spring 5 and a second pin shaft 63. The second pin shaft 63 passes through the inside of the spring 5 and connects the first hole 73 and the second hole 25. Thus, the spring 5 connected to the rotating body 2 generates a force on one side of the lever jaw 7, so that there is a certain pre-tightening force on the other side of the lever jaw 7 to hold the protective cap. This pre-tightening force brings a braking force when the rotating body 2 just starts to release the buckle, making it possible for the protective cap to rotate.

[0037] As Figure 9 and 10 shown in the figure, the friction cone disk 4 includes a frustum of a cone that is narrower at the top and wider at the bottom. A first through hole 43 is provided at the center of the frustum of the cone. The outer side surface of the frustum of the cone is an outer conical surface. The inner side wall 44 of the frustum of the cone is a rough surface. The friction cone disk 4 is connected to the nut friction column 3 through the first through hole 43. A key 42 that cooperates with the card slot 23 of the rotating body 2 is also provided on the outer circumference of the friction cone disk 4.

[0038] As Figure 7 and 8 shown in the figure, the nut friction column 3 includes a connecting column 32 and a friction disk 31. The center of the nut friction column 3 contains a square hole groove 33 connected to the output shaft of the power wrench 1. A square hole groove connected to the output shaft of the power wrench 1 is provided at the center of the connecting column. The square hole groove penetrates to the bottom of the connecting column 32. An internal thread 34 that cooperates with the stud 21 on the rotating body is provided in the square hole groove. The outer side surface of the friction disk 31 is a rough surface. The rough surfaces of the outer side surface of the friction disk 31 and the inner side wall 44 of the friction cone disk are in close contact during operation to transmit torque. In this embodiment, the hole groove adopts a square hole groove. At the same time, an internal spline can also be provided at the center of the nut friction column 3 to connect with the output shaft of the power wrench 1.

[0039] As Figure 3 shown in the figure, this structure also includes an anti-seize component 6. The anti-seize component 6 includes a locking screw 61 and a slider 62. A hole groove 75 is also provided on the lever jaw 7. A screw hole 76 is provided at the top of the hole groove. The slider is placed in the hole groove. The locking screw 61 is in plane contact with the slider 62 through the screw hole 76. A semi-cylindrical hole that cooperates with the first pin shaft 9 is provided at the bottom of the slider 62. In one case, for a protective cap with relatively large rigidity, after it is disassembled, there may be a situation where the lever jaw may bite tightly on the protective cap and is not easy to release. At this time, just loosen the locking screw 61, the slider 62 moves slightly, and the lever jaw 1 can be loosened from the protective cap.

[0040] The working principle of the present invention:

[0041] During the process of the cap spanner achieving its function, it includes three steps: rotational clamping, rotational loosening, and reverse reset. The following is a specific description of these steps.

[0042] Rotational clamping: First, connect the cap spanner to the air source, set the wrench direction switch to the loosening state, hold the cap spanner by hand and place the lever clamping jaw 7 on the cap. At this time, the lever clamping jaw 7 clamps the cap under the action of the spring 5. After starting the cap spanner, since the rotating body 2 is in close contact with the cap 11, the rotating body 2 is relatively stationary when the lever clamping jaw 7 clamps the cap 11. The pneumatic wrench rotates in the loosening direction, driving the nut friction column 3 to rotate. After the nut friction column 3 moves axially, the outer side of its friction disk 31 presses against the rough surface 44 inside the friction cone disk 4 and drives its circumferential movement. The outer conical surface 41 of the friction cone disk 4 pushes the bottom moving end 74 of the connecting part of the lever clamping jaw 7 to rotate around the fulcrum O, and the other end tooth surface 71 of the lever clamping jaw then tightly holds the outer circumference of the cap, thereby generating a braking torque;

[0043] Rotational loosening: As the nut friction column 3 continues to rotate, the braking torque drives an increase in the unclamping torque, so the normal pressure clamped by the lever clamping jaw 7 also increases, and its braking torque also increases accordingly. When the braking torque reaches a certain value, the cap starts to loosen and rotate until it disengages from the pipe string;

[0044] Reverse reset:

[0045] Set the direction switch of the power wrench 1 to the tightening state. By lightly pressing the button of the cap spanner, the power wrench 1 outputs reverse rotation, and the lever clamping jaw 7 can be loosened and disengaged from the cap. If there are individual stuck threads, the locking screw 61 in the anti-seize component 6 of one fulcrum O can be loosened to release the cap.

[0046] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. Protective cap screwing device, characterized in that, Including: A power wrench (1), a rotating body (2), a nut friction column (3), a friction cone disk (4), and a lever jaw (7). The output shaft of the power wrench (1) is connected to the nut friction column (3) for outputting torque. The nut friction column (3) is in frictional connection with the friction cone disk (4). The nut friction column (3) is in a screw pair connection with the rotating body (2). At least three lever jaws (7) are arranged along the outer circumference of the rotating body. The bottom moving end of the lever jaw can move along the outer conical surface (41) of the friction cone disk (4) under the action of the power wrench, so that the tooth surface (71) of the lever jaw clamps the protective cap. A stud (21) that is in a mating connection with the threaded friction column (3) is arranged at the center of the rotating body. At least two card slots (23) that are in a mating connection with the friction cone disk (4) are symmetrically arranged on the upper surface of the rotating body (2) centered on its center of the circle. The friction cone disk (4) includes a frustum with a narrow upper part and a wide lower part. A first through hole (43) is arranged at the center of the frustum. The outer side surface of the frustum is an outer conical surface. The inner side wall (44) of the frustum is a rough surface. The friction cone disk (4) is connected to the nut friction column (3) through the first through hole (43). A key (42) that is in a mating connection with the card slot (23) of the rotating body (2) is also arranged on the outer circumference of the friction cone disk (4). At least three slotted holes are arranged at equal intervals along the circumference of the rotating body. An ear seat (22) of the slotted hole is arranged in each slotted hole. Each ear seat (22) of the slotted hole includes a first ear seat and a second ear seat. A shaft hole is opened at the center of each of the first ear seat and the second ear seat. The corresponding holes on each ear seat of the slotted hole are connected to the lever jaw (7) through a first pin shaft (9). The nut friction column (3) includes a connecting column (32) and a friction disk (31). A square hole groove (33) that is connected to the output shaft of the power wrench (1) is arranged at the center of the connecting column. The square hole groove penetrates to the bottom of the connecting column (32). An internal thread (34) that is in a mating connection with the stud (21) on the rotating body is arranged in the square hole groove. The outer side surface of the friction disk (31) is a rough surface. The outer side surface of the friction disk (31) is in close contact with the inner side wall (44) of the friction cone disk during operation to transmit torque.

2. The cap screwing device according to claim 1, characterized in that, A connecting hole is arranged on the lever jaw (7). The first pin shaft (9) is connected to the shaft hole on the ear seat of the slotted hole through the connecting hole.

3. The cap screwing device according to claim 1, characterized in that, Limit bumps (26) are arranged on both sides of the bottom of the slotted hole of the rotating body (2). The lever jaw (7) includes a fixedly connected jaw and a connecting part. A tooth surface (71) is arranged on the inner side surface of the jaw. A limit hole (72) is also arranged on the jaw. The limit hole (72) is used for placing an elastic pin (10). The elastic pin (10) is in close contact with the limit bump (26) in the non-use state for limiting the lever jaw (7).

4. The cap screwing device according to claim 2, wherein, It further includes an anti-seize component (6), the anti-seize component (6) includes a locking screw (61) and a slider (62), a hole slot (75) is further provided on the lever jaw (7), a screw hole (76) is provided at the top of the hole slot, the slider is placed in the hole slot, the locking screw (61) is in direct contact with the slider (62) through the screw hole (76), and a semi-cylindrical hole matching with the first pin shaft (9) is provided at the bottom of the slider (62).

5. The cap screwing device according to claim 1, characterized in that, It further includes a spring (5) and a second pin shaft (63), a first hole (73) is provided at the lever jaw connecting portion, second holes (25) for placing the spring (5) are uniformly provided on the rotating body (2), and the second pin shaft (63) passes through the inside of the spring (5) to connect the first hole (73) and the second hole (25).

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