Locking device based on high-pressure internal expansion plugging device

Abstract

The utility model discloses a locking device based on a high pressure internal expansion plugging device, which comprises a main pipe, a plugging head and a sleeve, the plugging head is connected to the lower end of the main pipe and works in the sleeve, the bottom end of the main pipe is connected with a locking mechanism, an oil pipe and a reversing valve are respectively arranged on one side of the main pipe, and the main pipe is communicated with two ends of the oil pipe. The oil pipe penetrates through and is connected with the reversing valve, symmetrical hydraulic steel pipes are arranged on the side, opposite to the oil pipe, of the main pipe, a piston rod is embedded in the main pipe and driven by the main pipe, the hydraulic steel pipes and the piston rod both penetrate through the locking mechanism, and the locking mechanism is composed of an upper locking disc, a lower locking disc, a piston sleeve and a locking copper block. The piston rod and two hydraulic three-point stable design is adopted, the plugging head can keep an effective supporting state after being opened, reliability and safety are achieved, double supporting is formed by the hydraulic steel pipe and the locking copper block, and the moving frequency of the piston rod is reduced.

Description

Technical Field

[0001] This utility model relates to the field of locking device technology, and in particular to a locking device based on a high-pressure internal expansion plug. Background Technology

[0002] Currently, when carrying out emergency repairs or pipeline connection work on domestic natural gas, heating, oil, and water supply pipelines without interrupting supply, the process is generally highly complex and dangerous because it requires timely and effective sealing of the opened pipelines. Currently, locking devices are often used to drive high-pressure internal expansion plugs to expand and adhere tightly to the inner wall of the pipeline, using the sealing head cup to achieve a sealing effect.

[0003] Traditional high-pressure internal expansion plugs rely solely on the piston drive rod for sealing pipelines, lacking other effective support. This often increases the likelihood of displacement at the sealing head cup. Furthermore, due to the gap between the piston drive rod and the main pipe, when the pressure inside the main pipe is high, it can easily be pushed in the opposite direction, causing the piston drive rod to shift outward from the center, thus creating a safety hazard. Utility Model Content

[0004] Therefore, in order to solve the above problems and shortcomings, this utility model provides a locking device based on a high-pressure internal expansion plug, including a main pipe, a plug head and a sleeve, wherein the plug head is connected to the lower end of the main pipe and operates in the sleeve, the bottom end of the main pipe is connected to a locking mechanism, an oil pipe and a reversing valve are respectively provided on one side of the main pipe, the two ends of the main pipe and the oil pipe are kept in communication, and the oil pipe passes through and is connected to the reversing valve, and a symmetrical hydraulic steel pipe is provided on the side of the main pipe opposite to the oil pipe, a piston rod is embedded in the main pipe and the piston rod is driven by the main pipe, and both the hydraulic steel pipe and the piston rod pass through the locking mechanism.

[0005] Furthermore, the locking mechanism consists of an upper locking plate, a lower locking plate, a piston sleeve, and a locking copper block. The upper locking plate is tightly welded to the lower end of the main pipe and is tightly connected to the lower locking plate by bolts. The piston sleeve surrounds and is nested around the outside of the piston rod and maintains relative sliding between it and the main pipe. The locking copper block is located inside the lower locking plate and contacts the piston sleeve.

[0006] Furthermore, the outer side of the lower locking plate is provided with several equidistant locking screws, which pass through the lower locking plate through their threads and apply compressive force to the locking copper block.

[0007] Furthermore, the sleeve consists of a longitudinal sleeve and a transverse sleeve, wherein the longitudinal sleeve is tightly connected to the bottom of the lower locking plate, and the longitudinal sleeve and the transverse sleeve are connected by bolts.

[0008] Furthermore, the bottom end of the piston rod passes through the piston sleeve and the locking copper block respectively and is connected to the top drive position of the sealing head.

[0009] Furthermore, the piston sleeve is kept sliding between the main pipe and the upper locking plate by hydraulic oil drive, and the piston rod and the locking copper block maintain a clearance fit.

[0010] Furthermore, the bottom end of the hydraulic steel pipe passes through the upper locking plate, the lower locking plate, and the top of the sealing head, and extends to the inside of the sealing head.

[0011] The beneficial effects of this utility model can be specifically analyzed as follows:

[0012] Advantage 1: The sealing head is driven and limited by the piston rod and two hydraulic steel pipes respectively, forming a three-point stable fixation, so that the sealing head can maintain an effective support state after being opened, which is both reliable and safe.

[0013] Advantage 2: Because of the design of the hydraulic steel pipe passing through the sealing head downwards, it forms a double support with the locking copper block. In this way, even if the pipe pressure is large, it is not easy to push the piston sleeve in the opposite direction, causing the piston rod itself to deviate, rotate, or move, thus improving stability. Attached Figure Description

[0014] Figure 1 This is an overall schematic diagram of the locking device based on the high-pressure internal expansion plug of this utility model;

[0015] Figure 2 This is a utility model Figure 1 A longitudinal section diagram;

[0016] Figure 3 This is a utility model Figure 1 A schematic diagram of the structure after removing the upper and lower sleeves;

[0017] Figure 4 This is a utility model Figure 3 Side view;

[0018] Figure 5 This is a utility model Figure 4 Partial longitudinal sectional view of the central locking mechanism;

[0019] Reference numerals in the attached diagram: 1. Main pipe; 2. Sealing head; 3. Locking mechanism; 301. Upper locking plate; 302. Lower locking plate; 303. Piston sleeve; 304. Locking copper block; 305. Locking screw; 4. Oil pipe; 5. Reversing valve; 6. Hydraulic steel pipe; 7. Piston rod; 8. Upper sleeve. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Throughout the invention, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] It should be understood that ordinal numbers and directional descriptions, such as "first," "second," "third," "upper," "lower," "left," and "right," are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Therefore, they should not be construed as limitations on this utility model.

[0022] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Please refer to the attached drawings. Figure 1-5 As shown, this application provides a locking device based on a high-pressure internal expansion plug, including a main pipe 1, a plugging head 2, and a sleeve 8. The plugging head 2 is connected to the lower end of the main pipe 1 and operates inside the sleeve 8. The bottom end of the main pipe 1 is connected to a locking mechanism 3. An oil pipe 4 and a reversing valve 5 are respectively provided on one side of the main pipe 1. The two ends of the main pipe 1 and the oil pipe 4 are kept in communication, and the oil pipe 4 passes through and connects to the reversing valve 5. A symmetrical hydraulic steel pipe 6 is provided on the side of the main pipe 1 opposite to the oil pipe 4. A piston rod 7 is embedded in the main pipe 1 and is driven by the main pipe 1. Both the hydraulic steel pipe 6 and the piston rod 7 pass through the locking mechanism 3.

[0023] Based on the above description, the main pipe 1 is a hydraulic pipe that drives the piston rod 7 to move, and the reversing valve 5 controls the hydraulic oil flow direction of the oil pipe 4 to control the extension and retraction of the piston rod 7. The sealing head 2 is set in the transverse sleeve of the sleeve 8, and the piston rod 7 pushes the sealing head 2 open to seal the pipeline without interrupting the supply. At the same time, the hydraulic steel pipe 6 is controlled to apply force to limit the sealing head 2, thereby ensuring that the sealing head 2 will not be displaced or loosened, thus making the sealing effect better.

[0024] Please refer to the following for details. Figure 2-4As shown, the locking mechanism 3 consists of an upper locking plate 301, a lower locking plate 302, a piston sleeve 303, and a locking copper block 304. The upper locking plate 301 is tightly welded to the lower end of the main pipe 1 and is tightly connected to the lower locking plate 302 by bolts. The piston sleeve 303 surrounds and nests around the outside of the piston rod 7 and maintains relative sliding between it and the main pipe 1. The locking copper block 304 is located inside the lower locking plate 302 and is in contact with the piston sleeve 303. The locking screws 305 are equidistantly arranged on the outer side of the lower locking plate 302. The locking screws 305 penetrate the lower locking plate 302 through threads and apply compressive force to the locking copper block 304.

[0025] Based on the above description, the upper locking plate 301 and the main pipe 1 are integrated. There is also a sealing gasket between the upper locking plate 301 and the lower locking plate 302. The two are connected by bolts to facilitate internal maintenance. The piston sleeve 303 and the locking copper block 304 are respectively engaged in the upper locking plate 301 and the lower locking plate 302. The piston sleeve 303 is fixed to the side of the piston rod 7 and is driven to rise and fall by the hydraulic oil in the oil pipe 4. When the piston sleeve 303 slides down to the top position where it contacts the locking copper block 304, the piston rod 7 just pushes the sealing head 2 open to the limit. At this time, the piston rod 7 and the sealing head 2 need to be stable. Therefore, multiple sets of locking screws 305 are used to lock the locking copper block 304 in opposite directions to clamp the piston rod 7.

[0026] Please refer to the following for details. Figure 1-2 As shown, the sleeve 8 consists of a longitudinal sleeve and a transverse sleeve, wherein the longitudinal sleeve is tightly connected to the bottom of the lower locking plate 302, and the longitudinal sleeve and the transverse sleeve are connected by bolts.

[0027] Based on the above description, the transverse sleeve is used to cover and fix the main pipe under construction. Specifically, it can be customized according to the size of the main pipe under construction. The two ends of the cut main pipe are connected to the transverse sleeve. Then, the sealing head 2 is lowered into the longitudinal sleeve. The main pipe construction operation is carried out by limiting the transverse sleeve. The piston sleeve 303 is driven by hydraulic oil to slide between the main pipe 1 and the upper locking plate 301. The piston rod 7 and the locking copper block 304 maintain a clearance fit. The locking copper block 304 locks the piston rod 7 with the locking screw 305.

[0028] Please refer to Figure 2-5 As shown, the bottom end of piston rod 7 passes through piston sleeve 303 and locking copper block 304 respectively and is connected to the top drive position of sealing head 2. When the control reversing valve 5 rotates in the reverse direction, the hydraulic oil at the bottom end of oil pipe 4 backflows piston sleeve 303, causing piston rod 7 to move upward along main pipe 1, thereby pulling sealing head 2 to release. The bottom end of hydraulic steel pipe 6 passes through upper locking plate 301, lower locking plate 302 and the top of sealing head 2 respectively and is connected to the inside of sealing head 2, and finally maintains communication with the expansion cup on one side of sealing head 2.

[0029] Because the hydraulic steel pipe 6 penetrates downward through the sealing head 2 and forms a double support with the locking copper block 304, even if the pipe pressure is large, it is not easy to push the piston sleeve 303 in the opposite direction and cause the drive rod itself to deviate.

[0030] exist Figure 2 It should be noted that the hydraulic steel pipes 6 are driven by an external hydraulic oil cylinder. Both hydraulic steel pipes 6 are connected to the expansion cup on the far right of the sealing head 2, which serves to tighten the cup. That is, oil enters one hydraulic steel pipe 6 to expand the expansion cup of the sealing head 2, and oil returns from the other hydraulic steel pipe 6 to expand and contract the expansion cup.

[0031] In summary, this utility model, based on the locking device of a high-pressure internal expansion plug, adopts a piston rod and a two-hydraulic three-point stabilization design, which enables the plugging head to maintain an effective support state after it is opened, making it both reliable and safe. Moreover, the hydraulic steel pipe and the locking copper block form a double support, reducing the frequency of piston rod movement.

[0032] The above are merely embodiments of this utility model. Common knowledge such as specific structures and characteristics in the solutions are not described in detail here. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and they will not affect the implementation effect of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A locking device based on a high-pressure internal expansion plug, comprising a main pipe (1), a plugging head (2), and a sleeve (8), wherein the plugging head (2) is connected to the lower end of the main pipe (1) and operates inside the sleeve (8), characterized in that: The bottom end of the main pipe (1) is connected to a locking mechanism (3). An oil pipe (4) and a reversing valve (5) are respectively provided on one side of the main pipe (1). The two ends of the main pipe (1) and the oil pipe (4) are connected. The oil pipe (4) passes through and connects to the reversing valve (5). A symmetrical hydraulic steel pipe (6) is provided on one side of the main pipe (1) opposite to the oil pipe (4). A piston rod (7) is embedded in the main pipe (1). The piston rod (7) is driven by the main pipe (1). The hydraulic steel pipe (6) and the piston rod (7) both pass through the locking mechanism (3).

2. The locking device based on a high-pressure internal expansion plug as described in claim 1, characterized in that: The locking mechanism (3) consists of an upper locking plate (301), a lower locking plate (302), a piston sleeve (303), and a locking copper block (304). The upper locking plate (301) is tightly welded to the lower end of the main pipe (1) and is tightly connected to the lower locking plate (302) by bolts. The piston sleeve (303) surrounds and is nested around the outside of the piston rod (7) and maintains relative sliding between it and the main pipe (1). The locking copper block (304) is located inside the lower locking plate (302) and is in contact with the piston sleeve (303).

3. The locking device based on a high-pressure internal expansion plug as described in claim 2, characterized in that: The outer side of the lower locking disc (302) is provided with a number of equally spaced locking screws (305). The locking screws (305) pass through the lower locking disc (302) through the thread and apply a compressive force to the locking copper block (304).

4. The locking device based on a high-pressure internal expansion plug as described in claim 1, characterized in that: The sleeve (8) consists of a longitudinal sleeve and a transverse sleeve, wherein the longitudinal sleeve is tightly connected to the bottom of the lower locking plate (302), and the longitudinal sleeve and the transverse sleeve are connected by bolts.

5. The locking device based on a high-pressure internal expansion plug as described in claim 1, characterized in that: The bottom end of the piston rod (7) passes through the piston sleeve (303) and the locking copper block (304) respectively and is connected to the top drive position of the sealing head (2).

6. The locking device based on a high-pressure internal expansion plug as described in claim 2, characterized in that: The piston sleeve (303) is driven by hydraulic oil to slide between the main pipe (1) and the upper locking plate (301), and the piston rod (7) and the locking copper block (304) maintain a clearance fit.

7. The locking device based on a high-pressure internal expansion plug as described in claim 1, characterized in that: The bottom end of the hydraulic steel pipe (6) passes through the top of the upper locking plate (301), the lower locking plate (302) and the sealing head (2), and extends to the inside of the sealing head (2).

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