Cap unfastener

Abstract

The application discloses a cap unfastener, which comprises a power wrench, a rotary body, an output shaft of the power wrench and the rotary body being connected to transmit torque, and the rotary body comprising a rotary body, at least three connecting pieces being uniformly arranged along the outer circumference of the rotary body, each connecting piece being provided with a wedge-shaped inner slot with an opening facing inwards on the inner side close to the center, each connecting piece being provided with a baffle fixedly connected with the connecting piece on the front and back sides, the inside of the wedge-shaped inner slot being provided with a clamping column, the baffle being provided with a movement slot corresponding to the wedge-shaped inner slot to limit the movement of the clamping column, and the clamping column being capable of moving in the movement slot when being subjected to force. The cap unfastener has the advantages of simple and novel structure, reliable performance, driving by the power wrench, clamping and unfastening by means of the wedge-shaped friction formed by the cooperation of the wedge-shaped inner slot and the clamping column, fast and convenient operation, easy popularization and use, and further improvement of the work efficiency of the staff.

Description

Technical Field

[0001] This invention relates to the field of oil drilling equipment technology, and more particularly to cap release devices. Background Technology

[0002] Before running casing in oil drilling operations, the casing is laid horizontally on a steel frame at the site. The operator needs to unscrew the protective cap on one side of each casing thread, apply oil to the threads, and then screw the cap back on before hoisting it to the wellhead for casing running. However, unscrewing the casing cap is not easy; some casing threads are corroded, or the cap is deformed from impact, making it difficult to unscrew. Currently, for caps that are difficult to unscrew, the common practice in drilling operations is to use a hammer to tap the cap to loosen it or to directly destroy the cap. However, this can damage the threads when hammering, reducing work efficiency and affecting drilling efficiency. Summary of the Invention

[0003] The present invention addresses one or more of the aforementioned existing problems by proposing a cap unscrewing device.

[0004] According to one aspect of the present invention, a cap release device is provided, comprising: a power wrench and a rotating body, wherein the output shaft of the power wrench is connected to the rotating body for transmitting torque; the rotating body includes a rotating body, wherein at least three connectors are evenly arranged along its outer circumference, each connector having an inwardly opening wedge-shaped groove on its inner side near the center, and each connector having a baffle fixedly connected to the connector on both its front and rear sides, wherein a locking post is provided inside the wedge-shaped groove, and a movement groove corresponding to the wedge-shaped groove is provided on the baffle to restrict the movement of the locking post, wherein the two ends of the locking post can move within the movement groove when subjected to force.

[0005] In some feasible embodiments, the wedge-shaped inner groove includes an inner inclined surface located at the bottom of the wedge-shaped inner groove. The inner inclined surface slopes upward from one end of the inner groove to the other end. Both ends of the inner inclined surface are arc-shaped portions. The inner inclined surface is used to push the locking pin to move when the rotating body rotates, thereby generating a certain force on the protective cap.

[0006] In some feasible embodiments, the connector includes an arc surface and inclined surfaces symmetrically arranged at both ends of the arc surface. Both ends of the arc surface are connected to the rotating body through the inclined surfaces, and the axis of the arc surface coincides with the axis of the rotating body.

[0007] In some feasible embodiments, a reset mechanism is also included, comprising a reset spring and a guide post. Each inclined surface of the rotating body is provided with a first through hole extending to an opening slot for placing the reset spring. An internal thread is provided on the side of the first through hole near the inclined surface, and a screw plug is fixedly connected to the internal thread. The screw plug is used to limit one end of the reset spring. The guide post is inserted into the reset spring, with one end of it close to the retaining post, for generating a certain force on the retaining post under the action of the reset spring.

[0008] In some feasible implementations, an anti-lock braking system (ABS) reset mechanism is also included. The ABS reset mechanism includes a reset stud with a second threaded through hole on the inclined surface. The reset stud abuts against the locking pin through the second threaded through hole.

[0009] In some feasible embodiments, a preload mechanism is also included, comprising an elastic pressure plate, a compression spring, and an adjusting stud. An opening slot communicating with the wedge-shaped inner groove is provided on the outer circumference of the rotating body. The elastic pressure plate is placed on the locking post to apply a preload force to the locking post. A second through hole is provided on the elastic pressure plate. The compression spring is fitted onto the adjusting stud. After passing through the compression spring and the second through hole, one end of the adjusting stud is fixed in the opening slot, allowing adjustment of the preload force.

[0010] In some possible implementations, the rotating body also includes a connecting frame for connecting to the output shaft of a power wrench. The connecting frame includes three connecting posts symmetrically arranged along an arc segment of the rotating body. One end of each connecting post is connected to the center of the rotating body, and the center of the connecting frame is provided with a four-hole square groove.

[0011] In some feasible embodiments, each connector has two threaded holes on both the front and rear sides, with the two threaded holes symmetrically arranged on both sides of the wedge-shaped inner groove. The baffle is fixed to the connector of the rotating body by screws and threaded holes.

[0012] In some feasible embodiments, each connector has two threaded holes on both the front and rear sides, with the two threaded holes symmetrically arranged on both sides of the wedge-shaped inner groove. The baffle is fixed to the connector of the rotating body by screws and threaded holes.

[0013] The beneficial effects of this invention are:

[0014] The cap unscrewer provided by this invention has a simple and novel structure and reliable performance. Driven by a power wrench, it uses a wedge-shaped inner groove and a locking post to form a wedge-shaped friction to achieve clamping and turning. It is quick and convenient, easy to promote and use, and helps to further improve the work efficiency of workers. Attached Figure Description

[0015] Figure 1 A side three-dimensional structural diagram of a cap remover;

[0016] Figure 2 A frontal three-dimensional structural diagram of a cap remover;

[0017] Figure 3 This is a cross-sectional schematic diagram of a cap remover;

[0018] Figure 4 A schematic diagram of the three-dimensional structure of a rotating body of a cap release device;

[0019] Figure 5 A schematic diagram of the wedge-shaped inner groove end face of a cap remover;

[0020] Figure 6 A three-dimensional schematic diagram of the wedge-shaped inner groove of a cap remover;

[0021] Figure 7 A schematic diagram of the reset mechanism for a cap release device;

[0022] Figure 8 This is a schematic diagram of the structure of an explosion-proof cap detacher. Detailed Implementation

[0023] The technical solution proposed in this application will be further described in detail below with reference to the accompanying drawings.

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Example 1

[0028] like Figure 1-8As shown, this invention provides a cap release device, comprising: a power wrench 1 and a rotating body 2. The output shaft of the power wrench 1 is connected to the rotating body 2 to transmit torque. The rotating body 2 includes a rotating main body, and at least three connecting parts 21 are evenly arranged along its outer circumference. Each connecting part 21 has an inwardly opening wedge-shaped groove 22 on its inner side near the center. Each connecting part 21 has a baffle 11 fixedly connected to the connecting part on both its front and rear sides. Each connecting part has two threaded holes on both its front and rear sides, symmetrically arranged on both sides of the wedge-shaped groove 23. The baffle 11 is fixed to the connecting parts of the rotating body by screws 13 and threaded holes. Specifically, a support flange 18, a retaining ring 16, a bushing 17, and a cover 10 are also provided. The bushing 17 is disposed inside the support flange, and the retaining ring 16 is disposed between the rotating body, the support flange 18, and the cover 10 to protect the components from damage.

[0029] Each connector has two threaded holes on both the front and rear sides. The two threaded holes are symmetrically arranged on both sides of the wedge-shaped inner groove 23. The baffle 11 is fixed to the connector of the rotating body by screws 13 and threaded holes.

[0030] The wedge-shaped inner groove 22 is provided with a locking post 3 inside, and the baffle 11 is provided with a movement groove corresponding to the wedge-shaped inner groove 22 to restrict the movement of the locking post. When the locking post 3 is subjected to force, its two ends can move in the movement groove.

[0031] like Figure 5-6 As shown, the wedge-shaped inner groove includes an inner inclined surface 211 located at the bottom of the wedge-shaped inner groove. The inner inclined surface 211 slopes upward from one end A to the other end B inside the wedge-shaped inner groove. Both ends A and B of the inner inclined surface 211 are arc-shaped portions. The inner inclined surface 211 is used to push the locking pin 3 to move when the rotating body rotates, thereby generating a certain force on the protective cap.

[0032] The connector 21 includes an arc surface 212 and inclined surfaces 213 symmetrically arranged at both ends of the arc surface. Both ends of the arc surface 212 are connected to the rotating body through the inclined surfaces 213. The axis of the arc surface 212 coincides with the axis of the rotating body.

[0033] like Figure 4As shown, when the reset mechanism uses a reset spring 8, the reset mechanism includes a reset spring 8 and a guide post 9. Each inclined surface 213 of the rotating body is provided with a first through hole 214, which extends to the opening slot. The first through hole 214 serves as a spring hole for placing the reset spring 8. The guide post is inserted into the spring hole. The side of the first through hole 214 near the inclined surface is provided with an internal thread 215. A screw plug 12 is fixedly connected to the internal thread. The screw plug is used to limit one end of the reset spring 8. The guide post 9 is inserted into the reset spring 8, with one end close to the retaining post 3, and is used to generate a certain force on the retaining post 3 under the action of the reset spring 8.

[0034] As shown in Figure 4, an anti-lock reset mechanism can also be used. The anti-lock reset mechanism includes a reset stud 7 and a second threaded inner through hole on the inclined surface 213. The reset stud 7 abuts against the locking post 3 through the second threaded inner through hole.

[0035] like Figure 4 and 8 As shown, it also includes an elastic pressure plate 4, a compression spring 5, and an adjusting stud 6. An opening groove 23 communicating with the wedge-shaped inner groove 22 is provided on the outer circumference of the rotating body. The elastic pressure plate is placed on the locking post to apply a pre-tightening force to the locking post. A second through hole is provided on the elastic pressure plate 4. The compression spring 5 is fitted on the adjusting stud 6. After the adjusting stud 6 passes through the compression spring 5 and the second through hole, one end is fixed in the opening groove 23.

[0036] The rotating body 2 also includes a connecting frame for connecting to the output shaft of the power wrench 1. The connecting frame includes three connecting posts symmetrically arranged along the arc segment of the rotating body. One end of each connecting post is connected to the center of the rotating body. The center of the connecting frame is provided with a four-hole square groove 25.

[0037] Working principle of this invention:

[0038] This cap release device can perform multiple functions, including three steps: rotation clamping, rotation releasing, and reverse reset. The following is a detailed explanation of this step.

[0039] Rotary clamping: such as Figure 1-8 Connect the air supply to the cap release device, set the wrench's directional switch to the release position, and hold the cap release device onto the cap. The locking pin 3, under the pre-tightening force of the compression spring 5 and the elastic pressure plate 4, clamps the cap. The output shaft of the power wrench drives the rotating body 2 to rotate. The inner slope of the wedge-shaped inner groove 23 of the rotating body pushes the locking pin 3 to move, generating a certain force on the cap. Simultaneously, the cap generates frictional force on the locking pin 3 to prevent forward movement. Because the locking pin 3 is clamped within the space of the wedge-shaped inner groove, the rotating body 2 rotates, and the force on the locking pin 3 moves within the groove until the locking pin 3 clamps the cap.

[0040] Rotational release: Under the action of pre-tightening force, the rotating body 2 just begins to rotate, and the locking pin 3 rolls on the protective cap. As the torque of the wrench increases, the clamping force increases, eventually causing the rotating body 2, locking pin 3, and protective cap to rotate together. As the rotating body 2 continues to rotate, it will drive the locking pin 3 and protective cap to rotate together. The release torque increases with the increase of the protective cap's braking torque. When the release torque exceeds the protective cap's braking torque, the protective cap begins to loosen and rotate until it disengages, thus achieving the release of the protective cap.

[0041] Reverse Reset: With the power wrench 1 in the locked position, rotate the power wrench 1 in the reverse direction. As the locking pin 3 moves in the reverse direction, it will be released from the protective cap with the assistance of the reset spring and guide pin. If a dead lock occurs, the protective cap can be released by adjusting the reset stud 7 with a wrench to force the locking pin 3 to reset.

[0042] The above are merely some embodiments of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and all such modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A cap unfastener characterised by, include: A power wrench (1) and a rotating body (2) are provided. The output shaft of the power wrench (1) is connected to the rotating body (2) to transmit torque. The rotating body (2) includes a rotating body, and at least three connectors (21) are evenly arranged along its outer circumference. Each connector (21) has an inwardly opening wedge-shaped groove (22) on its inner side near the center. Each connector (21) has a baffle (11) fixedly connected to the connector on both its front and rear sides. A locking post (3) is provided inside the wedge-shaped groove (22). The baffle (11) is provided with a movement groove corresponding to the wedge-shaped inner groove (22) to restrict the movement of the locking post. When the locking post (3) is subjected to force, its two ends can move in the movement groove. The wedge-shaped inner groove includes an inner inclined surface (211) located at the bottom of the wedge-shaped inner groove. The inner inclined surface (211) slopes upward from one end of the wedge-shaped inner groove to the other end. Both ends of the inner inclined surface (211) are arc-shaped parts. The inner inclined surface (211) is used to push the locking post (3) to move when the rotating body rotates, and generate a certain force on the protective cap. It also includes a reset mechanism, which includes a reset spring (8) and a guide post (9). Each inclined surface (213) of the rotating body is provided with a first through hole (214). The first through hole (214) extends to the opening slot and is used to place the reset spring (8). The first through hole (214) is provided with an internal thread (215) on the side of the inclined surface. The internal thread is fixedly connected to a screw plug (12). The screw plug is used to limit one end of the reset spring (8). The guide post (9) is inserted into the reset spring (8), and one end of it is close to the locking post (3) to generate a certain force on the locking post (3) under the action of the reset spring (8).

2. The chinstrap releaser of claim 1, wherein The connector (21) includes an arc surface (212) and inclined surfaces (213) symmetrically arranged at both ends of the arc surface. Both ends of the arc surface (212) are connected to the rotating body through the inclined surfaces (213). The axis corresponding to the arc surface (212) coincides with the axis of the rotating body.

3. The chinstrap releaser of claim 1, wherein It also includes an anti-lock reset mechanism, which includes a reset stud (7), and a second threaded through hole is provided on the inclined surface (213). The reset stud (7) abuts against the locking stud (3) through the second threaded through hole.

4. The cap unscrewing device according to claim 1, characterized in that, It also includes a pre-tightening mechanism, which includes an elastic pressure plate (4), a compression spring (5), and an adjusting stud (6). The outer circumference of the rotating body is provided with an opening groove (23) that communicates with the wedge-shaped inner groove (22). The elastic pressure plate is placed on the locking post to apply a pre-tightening force to the locking post. The elastic pressure plate (4) is provided with a second through hole. The compression spring (5) is fitted on the adjusting stud (6). After the adjusting stud (6) passes through the compression spring (5) and the second through hole, one end is fixed in the opening groove (23) so that the magnitude of the pre-tightening force can be adjusted.

5. The cap unscrewing device according to claim 1, characterized in that, The rotating body (2) also includes a connecting frame for connecting with the output shaft of the power wrench (1). The connecting frame includes three connecting posts symmetrically arranged along the arc segment of the rotating body. One end of each connecting post is connected to the center of the rotating body. The center of the connecting frame is provided with a four-hole square groove (25).

6. The cap unscrewing device according to claim 1, characterized in that, Each of the connectors (21) has two threaded holes (24) on its front and rear sides. The two threaded holes (24) are symmetrically arranged on both sides of the wedge-shaped inner groove (22). The baffle (11) is fixed to the connector of the rotating body by screws (13) and threaded holes.

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