Quick pullback device for wireline under pressure

Abstract

This invention provides a rapid reverse-pull device for live-line cables, comprising a hydraulic cylinder with an upper connector attached to the cylinder body for fixing the hydraulic cylinder to a blowout preventer (BOP). A cable clamp is fixedly connected to the piston rod of the hydraulic cylinder via a lower connector, securing the cable extending from the BOP. When the hydraulic cylinder piston rod extends, it pulls the cable away from the BOP, thus achieving the reverse-pull purpose. Compared to existing technologies, the rapid reverse-pull device for live-line cables provided by this invention controls the magnitude of the reverse-pull force by precisely controlling the hydraulic cylinder pressure and accurately calculating the pulling force. This allows for determination of whether the tension on the cable exceeds its safe tensile strength during release. If not, the cable can continue to be used, thereby reducing cable usage costs. In on-site construction, a hydraulic control system on a grease injection console can be used to provide hydraulic power and control and calculate the magnitude of the reverse-pull force.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration equipment technology, and in particular to a rapid reverse-pull device for live-line working cables. Background Technology

[0002] During pressurized operations, cables are prone to getting stuck inside the control head. The main cause is debris entering the baffle pipe, causing the cable to get stuck during lifting and obstructed during lowering. In such cases, the blowout preventer (BOP) is shut off on-site to release the pressure inside the BOP. The connection between the BOP and the BOP is then disconnected. The crane is raised 1 meter above the wellhead, a cable clamp is installed, and the clamp is secured to the BOP. The crane is then used to pull the cable back to attempt to release the jam. However, due to the large weight tolerance of the crane, the pulling force cannot be precisely controlled. Furthermore, the crane is far from the BOP, and the BOP is heavy. Using the crane to pull the cable back to release the jam presents several risks: first, the crane's pulling force may be insufficient (even reaching the crane's maximum allowable lifting weight), failing to release the jam; second, the crane's weight tolerance may be inaccurate, and the pulling force may exceed the cable's safe tensile strength, rendering the cable unusable; and third, if the crane's pulling force is too great, the BOP will violently shake upon the moment the cable breaks, posing a safety risk. There is a risk of injury if the cable clamps are not securely fastened or if the operation is improper. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a fast reverse pulling device for cables used in live operations, which can effectively control the magnitude of the reverse pulling force and accurately calculate the magnitude of the pulling force.

[0004] The present invention provides a rapid reverse pulling device for live working cables, comprising a hydraulic cylinder, an upper connector connected to the cylinder body of the hydraulic cylinder for fixing the hydraulic cylinder to a blowout preventer; a lower connector connected to the piston rod of the hydraulic cylinder, a cable clamp fixedly connected to the lower connector for fixing the cable extending from the blowout preventer.

[0005] By precisely controlling the pressure of the hydraulic cylinder, the magnitude of the counter-pull force can be controlled, and the magnitude of the pull force can be accurately calculated. This allows it to determine whether the pull force on the cable during unblocking exceeds the cable's safe pull force. If it does not exceed the safe pull force, the cable can continue to be used, thereby reducing cable usage costs.

[0006] Preferably, the upper connector includes a tubular joint, the outer wall of which is provided with an external thread or the inner wall of which is provided with an internal thread, and the tubular joint is threadedly connected to the blowout preventer through the external thread or the internal thread; a groove penetrating both ends of the tubular joint is formed on the side wall of the tubular joint, the groove is connected to the internal space of the tubular joint and allows the cable to pass through; two hydraulic cylinders are provided, the cylinder bodies of the two hydraulic cylinders are respectively fixedly connected to the tubular joint and located on both sides of the axis of the tubular joint, the two hydraulic cylinders are parallel to the axis of the tubular joint, and the piston rods of the two hydraulic cylinders are respectively fixedly connected to the cable clamp and located on opposite sides of the cable clamp.

[0007] Preferably, the upper connector further includes a support plate, which is fixedly installed at the bottom of the tubular joint. A notch is provided on one side of the support plate for the cable to pass through. The notch communicates with the groove and extends to the axial direction of the joint. Two hydraulic cylinders are fixedly installed at the bottom of the support plate and located on both sides of the notch.

[0008] Preferably, the upper connector is connected to the hydraulic cylinder via a quick-installation joint.

[0009] Preferably, the quick-install connector includes a female connector, a male connector, a ball, and a first sleeve;

[0010] The female connector is provided with an annular groove;

[0011] The male connector has a cavity into which the female connector can be inserted. The male connector has several mounting holes that penetrate the outer surface of the male connector and the inner wall of the cavity. An outer hole and an inner hole are formed on the outer surface of the male connector and the inner wall of the cavity, respectively. An external thread is also provided on the outer surface of the male connector.

[0012] The sphere is disposed within the mounting hole, and the diameter of the sphere is smaller than the diameter of the outer hole and larger than the depth of the mounting hole and the diameter of the inner hole.

[0013] The first sleeve has a stepped hole, which includes a large diameter section and a small diameter section. The small diameter section has an internal thread that mates with the external thread. The first sleeve is fitted onto the male connector and forms a threaded connection with the male connector.

[0014] When the small hole of the first sleeve is located at the outer hole, the first sleeve squeezes the ball into the annular groove of the female connector; when the large hole of the first sleeve is located at the outer hole, pulling the female connector can squeeze the ball so that it completely comes out of the annular groove of the female connector.

[0015] The quick-install connector provides a secure and reliable connection. Tightening and unlocking can be achieved simply by turning the first sleeve, requiring no other auxiliary tools and making it easy to operate. Furthermore, the absence of loose parts effectively prevents the loss of components, making it particularly suitable for on-site construction operations.

[0016] Preferably, the lower connector includes a connecting buckle and a second sleeve; the connecting buckle includes an arc-shaped body, which is snapped onto the cable clip, and the arc-shaped body includes a first end and a second end, the first end being provided with a mounting post, and the mounting post being provided with external threads and screw holes;

[0017] The inner cavity of the second sleeve includes a cylindrical cavity and a trumpet-shaped cavity that are connected to each other. The cylindrical cavity is provided with an internal thread that mates with the external thread of the mounting post. The trumpet-shaped cavity gradually expands from the inside to the outside. The second sleeve is sleeved on the mounting post and forms a threaded connection with the mounting post. The second end of the arc-shaped body can extend into the trumpet-shaped cavity of the second sleeve and abut against the inner wall of the trumpet-shaped cavity.

[0018] The piston rod is provided with external threads, and the piston is screwed into the threaded hole to form a threaded connection with the first end.

[0019] When connecting the lower connector to the piston rod and cable clamp, no auxiliary tools such as wrenches are needed; it can be connected and fixed by hand by turning it. Furthermore, there are no loose parts, so the parts are not easily lost.

[0020] Preferably, the arc-shaped body includes a first clamping block and a second clamping block that are hinged together as one piece, wherein the end of the first clamping block away from the hinge is the first end of the arc-shaped body, and the end of the second clamping block away from the hinge is the second end of the arc-shaped body.

[0021] Preferably, the cable clamp includes a sleeve and a clamp; the sleeve is a cylindrical structure with a tapered through hole extending axially inside, and a first opening penetrating both ends of the sleeve is formed on the outer wall of the sleeve, the first opening communicating with the tapered through hole and allowing the cable to pass through; the clamp includes two symmetrical clamping plates, the two clamping plates fastening together to form a tapered structure; the clamp is inserted into the tapered through hole, and the taper of the clamp is equal to the taper of the tapered through hole.

[0022] Through the tapered through-hole of the ferrule and the tapered structure of the clamp, when the cable is subjected to a counter-tension, the greater the tension, the tighter the clamp is between the cable and the cable, effectively preventing the cable from coming off the clamp under stress.

[0023] Preferably, the cable clamp further includes a third sleeve, the inner wall of which is provided with an internal thread, and a second opening penetrating both ends of the outer wall of the third sleeve, the second opening communicating with the cavity inside the third sleeve and allowing the cable to pass through; the clamping sleeve is provided with an external thread that mates with the internal thread of the third sleeve, the third sleeve is sleeved on the outer wall of the clamping sleeve and forms a threaded connection with the clamping sleeve, and the second opening is misaligned with the first opening.

[0024] Preferably, the system also includes a hydraulic system connected to the hydraulic cylinder, the hydraulic system being used to control and calculate the magnitude of the pressure of the hydraulic cylinder.

[0025] Compared with existing technologies, the rapid reverse-pull device for live-line cables provided by this invention controls the magnitude of the reverse-pull force by precisely controlling the pressure of the hydraulic cylinder, and can accurately calculate the magnitude of the pull force. This allows for determination of whether the pull force on the cable exceeds its safe tensile strength during unblocking. If it does not exceed this limit, the cable can continue to be used, thus reducing cable usage costs. In on-site construction, the hydraulic control system of the grease injection console can provide hydraulic power, control, and calculate the magnitude of the reverse-pull force. It solves the problem of insufficient crane pull force when dealing with cables stuck in the grease injection blowout preventer box, which previously required crane reverse-pull to unblock the cable; it also solves the problem of inaccurate crane suspension, where the lifting pull force may exceed the cable's safe tensile strength, rendering the cable unusable; it avoids the safety risk of the blowout preventer violently shaking when the cable breaks due to excessive crane lifting force, and the risk of injury if the cable clamp is not securely fixed or if the operation is improper.

[0026] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved. Attached Figure Description

[0027] The invention will now be described in more detail based on embodiments that are merely non-limiting and with reference to the accompanying drawings. Wherein:

[0028] Figure 1 This is a front view of a rapid reverse-pull device for live-line working cables provided in an embodiment of the present invention;

[0029] Figure 2 This is a side view of a rapid reverse-pull device for live-line working cables provided in an embodiment of the present invention;

[0030] Figure 3 This is a perspective view of a rapid reverse-pull device for live-line working cables provided in an embodiment of the present invention;

[0031] Figure 4 This is a cross-sectional view of a rapid reverse-pull device for live-line working cables provided in an embodiment of the present invention;

[0032] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0033] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0034] Figure 7 This is a front view of a rapid reverse-pull device for live-line working cables provided in another embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Upper connector;

[0037] 11. Tubular joint; 12. Groove; 13. Support plate; 14. Notch;

[0038] 2. Hydraulic cylinder; 21. Cylinder body; 22. Piston; 23. Piston rod;

[0039] 3. Lower connector; 31. Connecting buckle; 311. First clamping block; 312. Second clamping block; 313. Mounting post; 314. Screw hole; 32. Second sleeve; 321. Trumpet-shaped cavity;

[0040] 4. Cable clamp; 41. Sleeve; 411. First opening; 42. Clamp; 43. Third sleeve; 431. Second opening; 44. Columnar rod;

[0041] 5. Quick-install connector; 51. Female connector; 511. Annular groove; 52. Male connector; 521. Mounting hole; 53. Ball; 54. First sleeve;

[0042] 6. Cables. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Based on the specific embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0044] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0045] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0046] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0047] Example 1

[0048] like Figures 1 to 6 As shown, the live-line working cable quick reverse pull device (hereinafter referred to as the reverse pull device) includes a hydraulic cylinder 2, an upper connector 1, a lower connector 3, and a cable clamp 4. The hydraulic cylinder 2 includes a cylinder body 21, a piston 22, and a piston rod 23. The upper connector 1 is connected to the end of the cylinder body 21 away from the piston rod 23. The upper connector 1 is used to fix the hydraulic cylinder 2 to the blowout preventer. The lower connector 3 is connected to the end of the piston rod 23 of the hydraulic cylinder 2 away from the cylinder body 21. The lower connector 3 is fixedly connected to the cable clamp 4. The cable clamp 4 is used to fix the cable 6 extending out of the blowout preventer.

[0049] Activating hydraulic cylinder 2 extends piston rod 23, pulling cable 6 away from the blowout preventer, thus achieving the purpose of reverse-pull cable 6. The pressure of hydraulic cylinder 2 is easily controlled and calculated. By precisely controlling the pressure of hydraulic cylinder 2, the magnitude of the reverse pull force can be controlled, effectively preventing excessive pulling force from breaking cable 6. Furthermore, the magnitude of the pulling force can be accurately calculated, thus determining whether the pulling force on cable 6 during release exceeds its safe pulling force. If it does not exceed this limit, cable 6 can continue to be used, thereby reducing the operating cost of cable 6.

[0050] The pressure of the hydraulic cylinder 2 of the counter-pull device can be controlled and calculated by connecting the hydraulic cylinder 2 to the hydraulic system. In on-site construction, the hydraulic system of the grease injection console can be connected to the hydraulic cylinder 2, and the hydraulic control system of the on-site grease injection console can be used to provide hydraulic power, control the magnitude of the counter-pull force, and accurately calculate the magnitude of the pull force.

[0051] The upper connector 1 includes a tubular joint 11 and a support plate 13.

[0052] The tubular connector 11 has an external thread on its outer wall or an internal thread on its inner wall. Correspondingly, an internal thread can be provided on the inner wall of the blowout preventer or an external thread on its outer wall, thereby forming a threaded connection between the tubular connector 11 and the blowout preventer. After connection, the tubular connector 11 is coaxial with the blowout preventer. In this embodiment, the tubular connector 11 has an external thread on its outer wall, and correspondingly, an internal thread can be provided on the inner wall of the blowout preventer. Compared with bolted connections, threaded connections do not require carrying loose parts, reducing the risk of part loss; additional tools are not required during installation, making operation simple. A groove 12 is formed on the side wall of the tubular connector 11, penetrating both ends of the tubular connector 11. The groove 12 communicates with the internal space of the tubular connector 11, allowing the cable 6 to pass through, enabling the cable 6 to enter the internal space of the tubular connector 11 from its side. A support plate 13 is fixedly installed at the bottom of the tubular connector 11. A notch 14 is provided on one side of the support plate 13 to allow the cable 6 to pass through. The notch 14 communicates with the groove 12 and extends to the axial direction of the connector, thus ensuring that the cable 6 is axially positioned on the tubular connector 11. The support plate 13 facilitates the fixing of the hydraulic cylinder 2 to the upper connector 1. By providing the groove 12 on the tubular connector 11 and the notch 14 on the support plate 13, the cable 6 can be inserted into the upper connector 1 from the side through the groove 12 and the notch 14 without cutting it, and without having to cut the cable 6 and then insert it from one end of the upper connector 1 and exit from the other.

[0053] Preferably, two hydraulic cylinders 2 are provided. The cylinder bodies 21 of the two hydraulic cylinders 2 are fixedly connected to the bottom sides of the tubular joint 11, respectively. The cylinder bodies 21 of the two hydraulic cylinders 2 are located on both sides of the axial direction of the tubular joint 11, and both hydraulic cylinders 2 are parallel to the axial direction of the tubular joint 11. The piston rods 23 of the two hydraulic cylinders 2 are fixedly connected to the cable clamps 4 and located on opposite sides of the cable clamps 4. By simultaneously pulling the cable 6 with the two hydraulic cylinders 2 located on opposite sides of the cable clamps 4, the cable 6 can be subjected to uniform force, thereby improving the stability of the operation of the entire reverse pulling device during the reverse pulling of the cable 6.

[0054] The hydraulic cylinder 2 can be non-detachably connected to the upper connecting member 1 by welding, or detachably connected by bolts and nuts. For ease of installation and disassembly of the hydraulic cylinder 2, preferably, the upper connecting member 1 and the hydraulic cylinder 2 are connected by a quick-connect coupling 5.

[0055] like Figure 5 As shown, the quick-install connector 5 includes a female connector 51, a male connector 52, a ball 53, and a first sleeve 54.

[0056] The female connector 51 includes a first mounting plate and a cylindrical mounting head protruding from the center of the mounting plate. The first mounting plate is preferably a flange, and the mounting head is provided with an annular groove 511.

[0057] The male connector 52 includes a second mounting plate and a mounting sleeve protruding from the center of the second mounting plate. The second mounting plate is preferably a flange. The cavity of the mounting sleeve allows the mounting head and its annular groove 511 to be inserted. Several mounting holes 521 are formed on the side wall of the mounting sleeve, penetrating the outer surface of the mounting sleeve and the inner wall of the cavity, forming an outer hole and an inner hole on the outer surface of the mounting sleeve and the inner wall of the cavity, respectively. When the mounting head is fully inserted into the mounting sleeve, the annular groove 511 and the inner hole of the mounting hole 521 align and communicate with the mounting hole 521. External threads are also provided on the outer surface of the mounting sleeve of the male connector 52.

[0058] The first sleeve 54 has a stepped hole, which includes a large hole section with a larger diameter and a small hole section with a smaller diameter connected to each other. The small hole section has an internal thread that matches the external thread on the outer surface of the male connector 52 mounting sleeve. The first sleeve 54 is fitted onto the male connector 52 and forms a threaded connection with the male connector 52.

[0059] A sphere 53 is disposed within the mounting hole 521. The diameter of the sphere 53 is smaller than the diameter of the outer hole but larger than the depth of the mounting hole 521 and the diameter of the inner hole. The smaller diameter of the sphere 53 allows it to pass through the outer hole into and out of the mounting hole 521; the smaller diameter of the sphere 53 prevents it from passing through the inner hole into and out of the mounting hole 521; and the larger diameter of the sphere 53 ensures that when the first sleeve 54 pushes the sphere 53 from the outer hole side, a portion of the sphere 53 can extend out of the inner hole and into the annular groove 511.

[0060] When the large-hole section of the first sleeve 54 is located at the outer hole, the sum of the distance between the inner wall of the large-hole section and the outer wall of the mounting cylinder, plus the depth of the mounting hole 521, is greater than the diameter of the ball 53. Under the pressure of the mounting head of the female connector 51, the ball 53 can retract from the inner hole of the mounting hole 521 and extend from the outer hole into the large-hole section. That is, at this time, the mounting head of the female connector 51 can be inserted into or pulled out of the mounting cylinder. When the mounting head of the female connector 51 is fully inserted into the mounting cylinder, the first sleeve 54 is turned so that the small-hole section of the first sleeve 54 gradually moves to the outer hole. The first sleeve 54 presses the ball 53 into the annular groove 511 of the female connector 51, thus locking the female connector 51 and the male connector 52. When it is necessary to disassemble the male connector 52 and the female connector 51, turn the first sleeve 54 to move the large hole section to the outer hole. At this time, pull the female connector 51 outward to squeeze the ball 53 so that it completely comes out of the annular groove 511 of the female connector 51, and the male connector 52 and the female connector 51 are unlocked and separated.

[0061] The quick-install connector 5 designed in this application has a firm and reliable connection. Locking and unlocking can be done simply by turning the first sleeve 54 without the need for other auxiliary tools, making it easy to operate. Moreover, there are no loose parts, which can effectively avoid the problem of losing parts, making it particularly suitable for on-site operation.

[0062] The female connector 51 is fixedly mounted on the support plate 13 of the upper connector 1 via the first mounting plate, and the male connector 52 is fixedly mounted on the cylinder body 21 of the hydraulic cylinder 2 via the second mounting plate; or the female connector 51 is fixedly mounted on the cylinder body 21 of the hydraulic cylinder 2 via the first mounting plate, and the male connector 52 is fixedly mounted on the support plate 13 of the upper connector 1 via the second mounting plate.

[0063] The hydraulic cylinder 2 can be detachably connected to the cable clamp 4 using bolts and nuts, but bolt and nut connections require auxiliary tools such as wrenches, and the bolts and nuts are easily lost. To facilitate the installation and disassembly of the hydraulic cylinder 2, this invention designs a novel lower connector 3 for connecting the hydraulic cylinder 2 and the cable clamp 4.

[0064] See Figure 6 The lower connector 3 includes a connecting buckle 31 and a second sleeve 32; the connecting buckle 31 includes an arc-shaped body, which is detachably snapped onto the cable clip 4. The arc-shaped body can be a one-piece structure or a shape like... Figures 1 to 6 The device shown is formed by hinged first clamping block 311 and second clamping block 312. The end of the first clamping block 311 away from the hinge is the first end of the arc-shaped body. The first end is provided with a mounting post 313, which is provided with external threads and screw holes 314. The end of the second clamping block 312 away from the hinge is the second end of the arc-shaped body. Rotating the second clamping block 312 can bring the first end and the second end closer together or further apart.

[0065] The inner cavity of the second sleeve 32 includes a communicating cylindrical cavity and a trumpet-shaped cavity 321. The cylindrical cavity has an internal thread that mates with the external thread of the mounting post 313. The trumpet-shaped cavity 321 gradually expands from the inside out. The second sleeve 32 is fitted onto the mounting post 313 and forms a threaded connection with it. The second end of the arc-shaped body can extend into the trumpet-shaped cavity 321 of the second sleeve 32 and abut against the inner wall of the trumpet-shaped cavity 321. By turning the second sleeve 32, the depth of the second end extending into the trumpet-shaped cavity 321 can be adjusted, thereby adjusting the distance between the first end and the second end, and tightening or loosening the connecting buckle 31.

[0066] The piston rod 23 is provided with external threads, and the piston 22 is screwed into the threaded hole 314 to form a threaded connection with the first end.

[0067] When the lower connector 3 is connected to the piston rod 23 and the cable clamp 4, no auxiliary tools such as wrenches are needed; the connection and fixation can be achieved by hand-tightening. Furthermore, there are no loose parts, so the parts are not easily lost.

[0068] When assembling the reverse pull device, screw the piston rod 23 into the screw hole 314 of the mounting post 313 to connect the piston rod 23 with the lower connector 3; turn the second sleeve 32 to disengage the second end from the second sleeve 32, rotate the second clamp 312 to move the second end away from the first end so that the arc-shaped body opens, and the opened arc-shaped body moves to the cable clip 4. Then rotate the second clamp 312 to bring the second end closer to the first end, thereby locking the cable clip 4. After that, turn the second sleeve 32 to gradually push the second end into the second sleeve 32, thereby tightening the connecting buckle 31 and making the connecting buckle firmly fastened to the cable clip 4.

[0069] The cable clamp 4 includes a sleeve 41, a clamp 42, and a third sleeve 43.

[0070] The ferrule 41 has a cylindrical structure and external threads. It has a tapered through hole extending along its axial direction. The outer wall of the ferrule 41 has a first opening 411 that passes through both ends of the ferrule 41. The first opening 411 is connected to the tapered through hole and allows the cable 6 to pass through.

[0071] The clip 42 is a conical structure formed by two symmetrical clamping plates interlocking with each other; the clip 42 is inserted into the conical through hole, and the taper of the clip 42 is equal to the taper of the conical through hole.

[0072] The inner wall of the third sleeve 43 is provided with an internal thread that mates with the external thread on the ferrule 41. The outer wall of the third sleeve 43 has a second opening 431 that extends through both ends of it. The second opening 431 communicates with the cavity inside the third sleeve 43 and allows the cable 6 to pass through. The third sleeve 43 is fitted onto the outer wall of the ferrule 41 and forms a threaded connection with the ferrule 41. The second opening 431 is misaligned with the first opening 411, thereby preventing the cable 6 inside the cable clamp 4 from coming out of the first opening 411.

[0073] Through the tapered through hole of the sleeve 41 and the tapered structure of the clip 42, when the cable 6 is subjected to a counter-tension, the greater the tension, the tighter the cable clip 4 is clamped between the cable 6 and the cable 6, effectively preventing the cable 6 from coming off the cable clip 4 under force.

[0074] The cable clamp 4 has a columnar rod 44 on each side. The piston rods 23 of the two hydraulic cylinders 2 are connected to the two columnar rods 44 through the lower connector 3. The extension of the piston rods 23 pushes the columnar rods 44 to move, thereby pulling the cable 6 back.

[0075] Example 2

[0076] Based on Example 1, the number of hydraulic cylinders 2 is changed to one (see Example 2). Figure 7 At this point, the cable 6 can still be pulled back in a controllable manner, but since there is only one hydraulic cylinder 2, it can only pull back on one side of the cable 6, which can easily cause the cable 6 to be unstable under force.

[0077] Finally, it should be noted that the above embodiments and examples are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments and examples, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments or examples, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments or examples of the present invention.

Claims

1. A rapid reverse-pull device for live-line working cables, characterized in that, The device includes a hydraulic cylinder, with an upper connector connected to the cylinder body for fixing the hydraulic cylinder to the blowout preventer; and a lower connector connected to the piston rod of the hydraulic cylinder, with a cable clamp fixedly connected to the lower connector for securing a cable extending from inside the blowout preventer. The upper connector is connected to the hydraulic cylinder via a quick-installation joint; The quick-installation connector includes a female connector, a male connector, a ball, and a first sleeve; The female connector is provided with an annular groove; The male connector has a cavity into which the female connector can be inserted. The male connector has several mounting holes that penetrate the outer surface of the male connector and the inner wall of the cavity. An outer hole and an inner hole are formed on the outer surface of the male connector and the inner wall of the cavity, respectively. An external thread is also provided on the outer surface of the male connector. The sphere is disposed within the mounting hole, and the diameter of the sphere is smaller than the diameter of the outer hole and larger than the depth of the mounting hole and the diameter of the inner hole. The first sleeve has a stepped hole, which includes a large diameter section and a small diameter section. The small diameter section has an internal thread that mates with the external thread. The first sleeve is fitted onto the male connector and forms a threaded connection with the male connector. When the small hole section of the first sleeve is located at the outer hole, the first sleeve squeezes the ball into the annular groove of the female connector; when the large hole section of the first sleeve is located at the outer hole, pulling the female connector can squeeze the ball so that it completely comes out of the annular groove of the female connector. The lower connector includes a connecting buckle and a second sleeve; the connecting buckle includes an arc-shaped body, which is snapped onto the cable clip; the arc-shaped body includes a first end and a second end, the first end is provided with a mounting post, and the mounting post is provided with external threads and screw holes. The inner cavity of the second sleeve includes a cylindrical cavity and a trumpet-shaped cavity that are connected to each other. The cylindrical cavity is provided with an internal thread that mates with the external thread of the mounting post. The trumpet-shaped cavity gradually expands from the inside to the outside. The second sleeve is sleeved on the mounting post and forms a threaded connection with the mounting post. The second end of the arc-shaped body can extend into the trumpet-shaped cavity of the second sleeve and abut against the inner wall of the trumpet-shaped cavity. The piston rod is provided with external threads, and the piston rod is screwed into the threaded hole to form a threaded connection with the first end.

2. The rapid reverse-pull device for live-line working cables according to claim 1, characterized in that, The upper connector includes a tubular joint, the outer wall of which is provided with an external thread or the inner wall of which is provided with an internal thread. The tubular joint is threadedly connected to the blowout preventer through the external or internal thread. A groove penetrating both ends of the tubular joint is formed on the side wall of the tubular joint. The groove is connected to the internal space of the tubular joint and allows the cable to pass through. Two hydraulic cylinders are provided. The cylinder bodies of the two hydraulic cylinders are respectively fixedly connected to the tubular joint and located on both sides of the axis of the tubular joint. Both hydraulic cylinders are parallel to the axis of the tubular joint. The piston rods of the two hydraulic cylinders are respectively fixedly connected to the cable clamp and located on opposite sides of the cable clamp.

3. The rapid reverse-pull device for live-line working cables according to claim 2, characterized in that, The upper connector also includes a support plate, which is fixedly installed at the bottom of the tubular joint. A notch is provided on one side of the support plate to allow the cable to pass through. The notch communicates with the groove and extends to the axial direction of the tubular joint. Two hydraulic cylinders are fixedly installed at the bottom of the support plate and located on both sides of the notch.

4. The rapid reverse-pull device for live-line working cables according to claim 1, characterized in that, The arc-shaped body includes a first clamping block and a second clamping block that are hinged together as one unit. The end of the first clamping block away from the hinge is the first end of the arc-shaped body, and the end of the second clamping block away from the hinge is the second end of the arc-shaped body.

5. The rapid reverse-pull device for live-line working cables according to claim 1, characterized in that, The cable clamp includes a sleeve and a clamp; the sleeve is a cylindrical structure with a tapered through hole extending axially inside, and a first opening penetrating both ends of the sleeve is formed on the outer wall of the sleeve, the first opening being connected to the tapered through hole and allowing the cable to pass through; the clamp includes two symmetrical clamping plates, which are fastened together to form a tapered structure; the clamp is inserted into the tapered through hole, and the taper of the clamp is equal to the taper of the tapered through hole.

6. The rapid reverse-pull device for live-line working cables according to claim 5, characterized in that, The cable clamp also includes a third sleeve, the inner wall of which is provided with an internal thread, and a second opening penetrating both ends of the outer wall of the third sleeve. The second opening communicates with the cavity inside the third sleeve and allows the cable to pass through. The clamp sleeve is provided with an external thread that mates with the internal thread of the third sleeve. The third sleeve is fitted onto the outer wall of the clamp sleeve and forms a threaded connection with the clamp sleeve. The second opening is misaligned with the first opening.

7. The rapid reverse-pull device for live-line working cables according to claim 1, characterized in that, It also includes a hydraulic system connected to the hydraulic cylinder, the hydraulic system being used to control and calculate the magnitude of the pressure of the hydraulic cylinder.

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