A pressurized sealing device and method for slurry conveying pipelines

Abstract

This invention provides a pressurized sealing device and method for slurry transport pipelines. The sealing device includes a repair pipe, two sets of drive systems disposed at both ends of the repair pipe, and two sets of pipe-clamping and fixing mechanisms. The repair pipe is fitted over the leak area of ​​the damaged pipe, and at least two sets of sealing strips are provided between the repair pipe and the damaged pipe. The leak area of ​​the damaged pipe to be sealed is located between at least two sets of sealing strips. The drive system includes multiple sets of second hydraulic cylinders, each set of second hydraulic cylinders having one end hinged to a pipe-clamping frame and the other end hinged to a corresponding force-bearing seat on the repair pipe. The two sets of pipe-clamping and fixing mechanisms provide positioning gripping points on both sides of the leak point in the slurry transport pipeline, providing force points for the second hydraulic cylinders. The repair pipe covers the damaged slurry transport pipeline, and the sealing operation of the pipeline transport system is completed under the drive of the second hydraulic cylinders. This invention can complete pressurized sealing operations of slurry transport pipelines, preventing pipeline blockage and ensuring the safety of the slurry transport system.

Description

Technical Field

[0001] This invention relates to the field of slurry conveying pipeline plugging technology, specifically to a pressurized plugging device and method for slurry conveying pipelines. Background Technology

[0002] Slurry transport pipelines differ from common oil, water, and gas pipelines. They are pipeline projects that use crushed solid materials such as coal and iron ore into particles of a specific gradation, mixed with water to prepare a slurry of a certain concentration, and then transported over long distances. Under normal operating conditions, the slurry within the pipeline flows homogeneously, and solid particles do not deposit and cause blockages. However, if the pipeline is worn through or damaged during construction, slurry leaks will occur, causing the entire transport system to shut down. If the leak is not promptly plugged, solid particles will clog the pipeline, potentially leading to the complete failure of the slurry transport system.

[0003] Since the slurry conveying pipe is a high-pressure conveying system, slurry will spray out after a leak occurs, making it difficult to carry out pressurized repairs. However, if the slurry conveying pipe is stopped from working and repaired and sealed, the entire system will be shut down, resulting in significant production losses. Therefore, inventing a pressurized sealing device suitable for slurry conveying systems is of great practical significance, as it can promptly seal leaks and prevent further deterioration of slurry pipeline blockage. Summary of the Invention

[0004] The purpose of this invention is to provide a pressurized sealing device and method for slurry conveying pipelines. This device can be used to pressurize and seal leaking slurry conveying pipelines, thereby preventing water loss and blockage.

[0005] To achieve the above-mentioned technical objectives, the present invention also provides a pressurized sealing device for a slurry conveying pipeline, the sealing device comprising a repair pipe, two sets of drive systems disposed at both ends of the repair pipe, and two sets of pipe clamping and fixing mechanisms;

[0006] The repair pipe is assembled and welded from at least two sets of pipe segments cut axially. The repair pipe includes a straight pipe sleeved on the leak area of ​​the damaged pipe to be sealed and flared mouths located at both ends of the straight pipe. At least two sets of sealing strips are provided between the straight pipe and the damaged pipe to be sealed. The leak area of ​​the damaged pipe to be sealed is located between the at least two sets of sealing strips.

[0007] Two sets of pipe clamping and fixing mechanisms are respectively fixedly installed on the damaged pipe to be sealed outside the two ends of the repair pipe. Each set of pipe clamping and fixing mechanisms includes a pipe clamping frame and two sets of clamping mechanisms installed on the pipe clamping frame. The pipe clamping frame is fixedly clamped on the outside of the damaged pipe to be sealed. Each set of clamping mechanisms includes a first hydraulic cylinder, a clamping arm and a first clamping plate. One end of the first hydraulic cylinder is fixed on the pipe clamping frame, and the other end is hinged to the end of the clamping arm. The first clamping plate is hinged to the clamping end of the clamping arm, and its inner wall is in matching contact with the outer pipe surface of the damaged pipe to be sealed. Under the action of the two sets of first hydraulic cylinders, the two clamping arms respectively drive the two first clamping plates to clamp the damaged pipe to be sealed.

[0008] The drive system includes multiple sets of second hydraulic cylinders, with force-bearing seats corresponding to both ends of the repair pipe. Each set of second hydraulic cylinders in each drive system has one end hinged to the pipe clamping frame and the other end hinged to the corresponding force-bearing seat.

[0009] The preferred technical solution of the present invention is as follows: The pipe clamping frame is an equilateral triangular support composed of three support rods, one side of which is located at the bottom of the damaged pipe to be sealed, and the other two sides are symmetrically arranged on both sides of the damaged pipe to be sealed. A first hydraulic cylinder fixing frame is provided at the top of the triangular pipe clamping frame. Two sets of clamping mechanisms are symmetrically arranged on both sides of the damaged pipe to be sealed. The cylinder body of the first hydraulic cylinder of each clamping mechanism is hinged to the first hydraulic cylinder fixing frame. The piston end of the first hydraulic cylinder is hinged to the tail end of the clamping arm. The upper parts of the two sets of clamping arms are connected by a connecting rod. The two ends of the connecting rod are respectively hinged to the two sets of clamping arms. A second clamping plate is hinged in the middle of the connecting rod. The clamping surface of the second clamping plate is in matching contact with the outer pipe surface of the top area of ​​the damaged pipe to be sealed.

[0010] The preferred technical solution of the present invention is as follows: the inner diameter of the straight pipe of the repair pipe is 45-55mm larger than the outer diameter of the damaged pipe to be sealed, the length of the straight pipe completely covers the leakage area, and the sealing strip is provided in two sets, symmetrically arranged on the outer wall of the damaged pipe to be sealed with the leakage area as the center, and the sealing strip is a rubber sealing structure.

[0011] The preferred technical solution of the present invention is as follows: the sealing strip includes an annular steel sheet or reinforcing bar welded to the outer wall of the damaged pipe to be sealed, and a rubber pad wrapped around the annular steel sheet or reinforcing bar. The rubber pad is a concave rubber ring, which is fixedly clamped to the outside of the annular steel sheet or reinforcing bar. The thickness of the sealing strip matches the gap width between the straight pipe and the damaged pipe to be sealed.

[0012] The preferred technical solution of the present invention is as follows: the repair pipe is assembled and welded from three sets of pipe segments of the same shape and size that are cut axially, and the damaged pipe to be sealed is a slurry conveying pipe in the working process.

[0013] The preferred technical solution of the present invention is as follows: the second clamping plate and the two sets of first clamping plates have the same shape and structure, all of which are arc-shaped plates or arc-shaped plates composed of three folded plates. The three sets of clamping plates are evenly distributed along the annular surface of the damaged pipe to be sealed. The middle part of the second clamping plate is rotatably connected to the pivot seat in the middle of the connecting rod through a pivot. The middle part of the first clamping plate is rotatably connected to the clamping end of the corresponding clamping arm through a pivot. A pipe surface contact plate is provided on the contact surface between the second clamping plate and the two sets of first clamping plates and the damaged pipe to be sealed. The pipe surface contact plate is a rubber pad with anti-slip texture, which is embedded in the corresponding mounting groove opened on the clamping plate by the protrusion on the back.

[0014] The preferred technical solution of the present invention is as follows: the drive system is a hydraulic drive system, and a corresponding oil supply system including a hydraulic oil tank and an oil supply pipeline is also provided; each drive system includes three sets of second oil cylinders, the three sets of second oil cylinders are respectively set at the three corners of the triangular pipe clamping frame, and three force seats are respectively provided at the two ends of the straight pipe outside the repair pipe. The three force seats at each end are on the same straight line as the three corners of the pipe clamping frame. The cylinder seat of each set of second oil cylinders is hinged to the corner of the corresponding side of the pipe clamping frame, and the piston end is hinged to the corresponding side force seat.

[0015] The present invention also provides a method for pressurized plugging of a slurry conveying pipeline. The plugging method uses the above-mentioned pressurized plugging device for slurry conveying pipelines to plug the damaged pipeline, and the specific steps are as follows:

[0016] S1 identifies the leak point in the pipeline and removes the buried soil and debris around the leak area of ​​the damaged pipeline;

[0017] S2 installs pipe clamping and fixing mechanisms on both sides of the leak area of ​​the damaged pipeline. The pipe clamping frame of each set of pipe clamping and fixing mechanisms is fixedly clamped on the outside of the damaged pipeline. Two sets of clamping mechanisms are located on both sides of the damaged pipeline, and the connecting rod is located on the upper part of the damaged pipeline. The second clamping plate and the two sets of first clamping plates on the connecting rod are adjusted so that the clamping surfaces of the three sets of clamping plates are in contact with the damaged pipeline. Oil is injected into the two first cylinders through the external hydraulic system, and the two sets of clamping arms drive the three sets of clamping plates to continuously clamp the damaged steel pipe.

[0018] S3 welds annular steel sheets or reinforcing bars inside the sealing strip on both sides of the leak area of ​​the damaged steel pipe, and installs concave rubber sealing rings on the annular steel sheets and reinforcing bars.

[0019] S4. Install a repair pipe near the leak area of ​​the damaged pipeline. The segments of the repair pipe are assembled into a complete sleeve that fits over the damaged pipeline and then welded together. A load-bearing seat is welded and installed on the repair pipe.

[0020] S5. Install the second cylinder. The cylinder body of each set of second cylinders is hinged to the pipe clamping bracket, and the piston end is hinged to the corresponding force-bearing seat. Install the second cylinders of both drive systems. After installation, the second cylinder connected to the pipe clamping and fixing mechanism on the side adjacent to the repair pipe is in the retracted state, and the second cylinder connected to the pipe clamping and fixing mechanism on the side away from the repair pipe is in the extended state.

[0021] S6. Start the second cylinders on both sides of the drive system. The second cylinders in the retracted state gradually extend to push the repair pipe toward the leak area. At the same time, the second cylinders in the extended state gradually retract to pull the repair pipe toward the leak area. Under the action of the two sets of drive systems, the repair pipe is pushed and pulled to the leak area. Under the action of the bell mouth of the repair pipe, both sealing strips are tightened to the straight pipe area of ​​the repair pipe and the leak area is completely covered. The relative position of the repair pipe and the damaged steel pipe is adjusted by the second cylinders on both sides until the pressurized sealing operation is completed.

[0022] A further technical solution of the present invention: The sealing method is for sealing leaks in coal slurry conveying pipelines without stopping the slurry conveying.

[0023] A further technical solution of the present invention: The leak point is determined by the pipeline transport pressure. When the pressure wave changes abruptly, the location of the leak in the slurry pipeline is determined by multiplying the time difference between the occurrence of the pressure wave and the change in pressure wave by the wave velocity of the slurry pipeline.

[0024] The pipe contact plate in this invention is a rubber pad with anti-slip texture, which can be serrated to increase friction with the damaged steel pipe and improve contact strength. The clamping plate has a concave clamping surface, which is mainly used to connect and fix the pipe contact plate through a keyway. Each clamping plate has four pipe contact plates. The clamping plate has three parts: an upper clamping plate, a left clamping plate, and a right clamping plate, which can clamp and fix it to the damaged pipe to be sealed. The clamping arm has two parts: a left clamping arm and a right clamping arm, which can symmetrically clamp the three sets of clamping plates. The connections between the clamping plate and the pipe contact plate, the clamping plate and the clamping arm, and the clamping arm and the crossbar are all movable and adjustable. When the first hydraulic cylinder extends, it drives the rear of the two clamping arms to extend while the middle part remains fixed and rotates. The front of the clamping arm retracts inward to clamp. In this invention, the straight section of the repair pipe is one pipe grade larger than the damaged steel pipe, while its wall thickness remains the same. The length of the repair pipe in the middle section completely covers the damaged area of ​​the damaged steel pipe.

[0025] The beneficial effects of this invention are:

[0026] (1) The present invention uses a hydraulic drive system and a pipe clamping mechanism. Two sets of pipe clamping mechanisms provide positioning gripping points on both sides of the leakage point of the slurry conveying pipeline, providing a force point for the second oil cylinder. The second oil cylinder can push the repair pipe to the leakage area of ​​the pressurized slurry conveying pipeline during the operation, and perform pressurized sealing operation on the leakage area, so as to avoid the water loss problem of the slurry conveying pipeline in time and avoid the pipeline blockage. The present invention can ensure the safety of the slurry conveying system.

[0027] (2) The repair pipe of the present invention is made of several pipe pieces cut axially and then welded together, which can be easily installed. It can be installed near the leakage area of ​​the damaged pipe to be repaired without stopping the slurry delivery. The diameter of the assembled pipe is one size larger than the diameter of the pipe to be repaired, which can be easily moved on the pipe to be repaired. The sealing strip is welded and fixed on both sides of the leakage area of ​​the pipe to be repaired. During the pushing of the repair pipe, it can seal the gap between the repair pipe and the damaged pipe to be repaired, achieving a better sealing effect.

[0028] (3) By equipping a hydraulic drive system, the present invention ensures the safety of personnel during operation. At the same time, the present invention can also be used for pressurized sealing of leaks in oil and gas, water supply and drainage and chemical pipelines. It has the advantages of wide applicability and strong stability. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0030] Figure 2 This is a side view of the present invention;

[0031] Figure 3 yes Figure 2 Sectional view of AA;

[0032] Figure 4 This is a schematic diagram of the tube fixing mechanism of the present invention;

[0033] Figure 5 This is a schematic diagram of the clamping plate of the present invention;

[0034] Figure 6 This is a schematic diagram of the clamping arm of the present invention.

[0035] In the diagram: 1—Repair pipe, 100—Straight pipe, 101—Flange, 2—Damaged pipe to be sealed, 200—Leakage area, 3—Pipe clamping and fixing mechanism, 300—Pipe clamping bracket, 301—First hydraulic cylinder, 302—Clamping arm, 303—First clamping plate, 304—First hydraulic cylinder fixing bracket, 305—Connecting rod, 306—Second clamping plate, 307—Pipe surface contact plate, 4—Sealing strip, 5—Second hydraulic cylinder, 6—Force bearing seat. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. Figures 1 to 6 All accompanying drawings are simplified versions of embodiments and are intended only to clearly and concisely illustrate the embodiments of the present invention. The technical solutions shown in the drawings below are specific solutions of embodiments of the present invention and are not intended to limit the scope of the claimed invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Example 1 provides a pressurized sealing device for a slurry conveying pipeline, such as Figure 1 and Figure 3As shown, the system includes a repair pipe 1, two sets of drive systems and two sets of pipe clamping and fixing mechanisms 3 located at both ends of the repair pipe 1. The repair pipe 1 is composed of three sets of pipe segments of the same size and shape that are axially cut and welded together, which is essentially dividing the complete repair pipe 1 into three equal parts axially. The repair pipe 1 includes a straight pipe 100 that is fitted over the leakage area 200 of the damaged pipe 2 to be sealed and flared ends 101 located at both ends of the straight pipe 100. The inner diameter of the straight pipe 100 of the repair pipe 1 is 45-55mm larger than the outer diameter of the damaged pipe 2 to be sealed. Generally, the straight pipe 100 of the repair pipe 1 is selected from pipes with the same material and wall thickness as the damaged pipe to be repaired, but one size larger, so that it can fit over the damaged pipe 2 to be repaired. The length of the straight pipe 100 completely covers the leakage area 200. The damaged pipe 2 to be sealed is a slurry conveying pipe during the working process. The diameter of the flared opening 101 is slightly larger than that of the straight pipe. Two sets of sealing strips 4 are provided between the straight pipe 100 and the damaged pipe 2 to be sealed. The inner diameter of the flared opening 101 is larger than the outer diameter of the sealing strip 4. The leakage area 200 of the damaged pipe 2 to be sealed is located between the two sets of sealing strips 4. The two sets of sealing strips 4 are symmetrically arranged on the outer wall of the damaged pipe 2 to be sealed with the leakage area 200 as the center, and the sealing strips 4 are rubber sealing structures. The sealing strip 4 includes an annular steel sheet or reinforcing bar welded to the outer wall of the damaged pipe 2 to be sealed, and a rubber pad wrapped around the annular steel sheet or reinforcing bar. The rubber pad is a concave rubber ring, which is fixedly clamped to the outside of the annular steel sheet or reinforcing bar. The thickness of the sealing strip 4 matches the gap width between the straight pipe 100 and the damaged pipe 2 to be sealed.

[0040] Example 1 provides a pressurized sealing device for a slurry conveying pipeline, such as Figures 1 to 6As shown, two sets of pipe clamping and fixing mechanisms 3 are respectively fixedly installed on the damaged pipe 2 to be sealed, outside the two ends of the repair pipe 1. Each set of pipe clamping and fixing mechanisms 3 includes a pipe clamping frame 300 and two sets of clamping mechanisms installed on the pipe clamping frame 300. The pipe clamping frame 300 is an equilateral triangular support composed of three support rods, one side of which is located at the bottom of the damaged pipe 2 to be sealed, and the other two sides are symmetrically arranged on both sides of the damaged pipe 2 to be sealed. A first hydraulic cylinder fixing frame 304 is provided at the top of the triangular pipe clamping frame 300, and the two sets of clamping mechanisms are symmetrically arranged on both sides of the damaged pipe 2 to be sealed. Each clamping mechanism includes a first hydraulic cylinder 301, a clamping arm 302, and a first clamping plate 303. The cylinder body of the first hydraulic cylinder 301 is hinged to a first hydraulic cylinder fixing frame 304. The piston end of the first hydraulic cylinder 301 is hinged to the tail end of the clamping arm 302. The first clamping plate 303 is hinged to the clamping end of the clamping arm 302, and its inner wall is in contact with the outer pipe surface of the damaged pipe 2 to be sealed. The upper parts of the two sets of clamping arms 302 are connected by a connecting rod 305. The two ends of the connecting rod 305 are respectively hinged to the two sets of clamping arms 302. A second clamping plate 306 is hinged to the middle of the connecting rod 305. The clamping surface of the second clamping plate 306 is in contact with the outer pipe surface of the top area of ​​the damaged pipe 2 to be sealed. Under the action of the two sets of first hydraulic cylinders 301, the two clamping arms 302 respectively drive the clamping plates to clamp the damaged pipe 2 to be sealed. The second clamping plate 306 and the two sets of first clamping plates 303 have the same shape and structure. They are all arc-shaped plates or arc-shaped plates composed of three folded plates. The three sets of clamping plates are evenly distributed along the annular surface of the damaged pipe 2 to be sealed. The middle part of the second clamping plate 306 is rotatably connected to the pivot seat in the middle of the connecting rod 305 through a pivot. The middle part of the first clamping plate 303 is rotatably connected to the clamping end of the corresponding clamping arm 302 through a pivot. The contact surfaces of the second clamping plate 306 and the two sets of first clamping plates 303 with the damaged pipe 2 to be sealed are all provided with pipe surface contact plates 307. The pipe surface contact plates 307 are rubber pads with anti-slip textures, which are embedded into the corresponding mounting grooves opened on the clamping plates by the protrusions on the back.

[0041] Example 1 provides a pressurized sealing device for a slurry conveying pipeline, such as Figures 1 to 3As shown, the drive system includes multiple sets of second cylinders 5, with corresponding force-bearing seats 6 at both ends of the repair pipe 1. Each set of second cylinders 5 in each drive system is hinged at one end to the pipe clamping frame 300 and at the other end to the corresponding force-bearing seat 6. The drive system is a hydraulic drive system and also includes a supply system comprising a hydraulic oil tank and a supply pipeline. Each drive system includes three sets of second cylinders 5, which are respectively located at the three corners of the triangular pipe clamping frame 300. Three force-bearing seats 6 are respectively located near both ends of the straight pipe 100 of the repair pipe 1. The three force-bearing seats 6 at each end are collinear with the three corners of the pipe clamping frame 300. The cylinder seat of each set of second cylinders 5 is hinged to the corner of the corresponding side of the pipe clamping frame 300, and the piston end is hinged to the corresponding side force-bearing seat 6.

[0042] Example 2 provides a method for pressurized plugging of a slurry conveying pipeline. Using the pressurized plugging device described in Example 1, this method plugs leaks in coal slurry conveying pipelines without stopping slurry delivery. The specific steps are as follows:

[0043] S1. Determine the leak point in the pipeline and remove the buried soil and debris around the leak area of ​​the damaged pipeline. The pipeline leak point can be observed through the existing smart pipeline system. In a slurry transport pipeline without leaks, its pressure wave is stable. When a leak occurs at a certain point, the pressure wave will change abruptly. By multiplying the time difference between the occurrence of the pressure wave and the change in pressure wave by the wave velocity of the slurry pipeline (the wave velocity is constant), the location of the leak in the slurry pipeline can be determined.

[0044] S2. For example Figure 1 and Figure 3 As shown, pipe clamping and fixing mechanisms 3 are installed on both sides of the leakage area 200 of the damaged pipeline 2 to be repaired. The pipe clamping frame 300 of each set of pipe clamping and fixing mechanisms 3 is fixedly clamped on the outside of the damaged pipeline. The two sets of clamping mechanisms are symmetrically located on both sides of the damaged pipeline 2 to be repaired. The connecting rod 305 is located on the upper part of the damaged pipeline 2 to be repaired. The second clamping plate 306 on the connecting rod 305 and the first clamping plate 303 on the two sets of clamping arms 302 are adjusted so that the clamping surfaces of the three sets of clamping plates are in contact with the damaged pipeline. Each set of clamping plates has a pipe surface contact plate 307 on its clamping surface. The pipe surface contact plate 307 is a rubber pad with anti-slip texture. The anti-slip texture can be set in a serrated shape. Its main function is to increase the friction with the damaged steel pipe and improve the contact strength. Oil is injected into the two first cylinders 301 through the external hydraulic system. The two sets of clamping arms 302 drive the three sets of clamping plates to continuously clamp and fix the damaged steel pipe.

[0045] S3 welds the annular steel sheet or reinforcing bar inside the sealing strip on both sides of the leak area 200 of the damaged pipeline 2 to be repaired, and installs concave rubber sealing rings on the annular steel sheet and reinforcing bar to form two sets of sealing strips 4 symmetrically arranged with the leak area 200 as the center.

[0046] S4. Install a repair pipe 1 at a location near the leak area 200 of the damaged pipe 2 to be repaired. The repair pipe 1 is installed in an undamaged area on the left or right side of the leak area 200. The repair pipe 1 is assembled from three sets of three equally divided pipe segments to form a complete sleeve that fits over the damaged pipe. Weld the joints to form a complete sleeve. Weld a load-bearing seat 6 in the straight pipe area of ​​the repair pipe 1.

[0047] S5. Install the second hydraulic cylinder 5. The cylinder body of each set of second hydraulic cylinder 5 is hinged to the corner of the pipe clamping frame 300, and the piston end is hinged to the corresponding force-bearing seat 6. Install the second hydraulic cylinder 5 of both drive systems. After installation, the second hydraulic cylinder connected to the pipe clamping and fixing mechanism on the side adjacent to the repair pipe 1 is in the retracted state, and the second hydraulic cylinder connected to the pipe clamping and fixing mechanism on the side away from the repair pipe is in the extended state.

[0048] S6. Start the second cylinders 5 on both sides of the drive system. The second cylinders in the retracted state gradually extend to push the repair pipe 1 toward the leak area 200. At the same time, the second cylinders in the extended state gradually retract to pull the repair pipe 1 toward the leak area 200. Under the action of the two sets of drive systems, the repair pipe 1 is pushed and pulled to the leak area 200. Under the action of the flared mouth of the repair pipe, both sealing strips 4 are gathered to the straight pipe 100 area of ​​the repair pipe 1 and the leak area 200 is completely covered. Finally, the relative position of the repair pipe 1 and the damaged pipe 2 to be repaired is adjusted by the second cylinders 5 on both sides until the pressurized sealing operation is completed.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the structural relationships and principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A pressurized sealing device for a slurry conveying pipeline, characterized in that: The sealing device includes a repair pipe (1), two sets of drive systems and two sets of pipe clamping and fixing mechanisms (3) set at both ends of the repair pipe (1); The repair pipe (1) is assembled and welded from at least two sets of pipe segments cut axially. The repair pipe (1) includes a straight pipe (100) sleeved on the leakage area (200) of the damaged pipe (2) to be sealed and a bell mouth (101) located at both ends of the straight pipe (100). At least two sets of sealing strips (4) are provided between the straight pipe (100) and the damaged pipe (2) to be sealed. The leakage area (200) of the damaged pipe (2) to be sealed is located between at least two sets of sealing strips (4). Two sets of pipe clamping and fixing mechanisms (3) are respectively fixedly installed on the damaged pipe (2) to be sealed outside the two ends of the repair pipe (1). Each set of pipe clamping and fixing mechanisms (3) includes a pipe clamping frame (300) and two sets of clamping mechanisms installed on the pipe clamping frame (300). The pipe clamping frame (300) is fixedly clamped on the outside of the damaged pipe (2) to be sealed. Each set of clamping mechanisms includes a first hydraulic cylinder (301), a clamping arm (302) and a first clamping plate (303). One end of the first hydraulic cylinder (301) is fixed on the pipe clamping frame (300), and the other end is hinged to the end of the clamping arm (302). The first clamping plate (303) is hinged to the clamping end of the clamping arm (302), and its inner wall is matched and in contact with the outer pipe surface of the damaged pipe (2) to be sealed. Under the action of the two sets of first hydraulic cylinders (301), the two clamping arms (302) respectively drive the two first clamping plates (303) to clamp the damaged pipe (2) to be sealed. The drive system includes multiple sets of second cylinders (5), and force seats (6) are provided at both ends of the repair pipe (1). Each set of second cylinders (5) of each drive system is hinged at one end to the pipe clamp (300) and at the other end to the corresponding force seat (6). The pipe clamp (300) is an equilateral triangular support composed of three support rods, one side of which is located at the bottom of the damaged pipe (2) to be sealed, and the other two sides are symmetrically arranged on both sides of the damaged pipe (2) to be sealed. A first hydraulic cylinder fixing bracket (304) is provided at the top of the triangular pipe clamp (300). Two sets of clamping mechanisms are symmetrically arranged on both sides of the damaged pipe (2) to be sealed. The cylinder body of the first hydraulic cylinder (301) of each clamping mechanism is hinged to the first hydraulic cylinder. The fixed frame (304) has the piston end of the first oil cylinder (301) hinged to the tail end of the clamping arm (302). The upper parts of the two sets of clamping arms (302) are connected by a connecting rod (305). The two ends of the connecting rod (305) are respectively hinged to the two sets of clamping arms (302). A second clamping plate (306) is hinged in the middle of the connecting rod (305). The clamping surface of the second clamping plate (306) is in contact with the outer pipe surface of the top area of ​​the damaged pipe (2) to be sealed.

2. The pressurized sealing device for a slurry conveying pipeline according to claim 1, characterized in that: The inner diameter of the straight pipe (100) of the repair pipe (1) is 45-55 mm larger than the outer diameter of the damaged pipe (2) to be sealed. The length of the straight pipe (100) completely covers the leakage area (200). The sealing strip (4) is provided in two sets, symmetrically arranged on the outer wall of the damaged pipe (2) to be sealed with the leakage area (200) as the center, and the sealing strip (4) is a rubber sealing structure.

3. The pressurized sealing device for a slurry conveying pipeline according to claim 1, characterized in that: The sealing strip (4) includes an annular steel sheet or steel bar welded to the outer wall of the damaged pipe (2) to be sealed, and a rubber pad wrapped around the annular steel sheet or steel bar. The rubber pad is a concave rubber ring, which is fixedly clamped to the outside of the annular steel sheet or steel bar. The thickness of the sealing strip (4) matches the gap width between the straight pipe (100) and the damaged pipe (2) to be sealed.

4. The pressurized sealing device for a slurry conveying pipeline according to claim 1, characterized in that: The repair pipe (1) is made of three sets of pipe segments of the same shape and size that are cut axially and welded together. The damaged pipe to be sealed (2) is a slurry conveying pipe in the working process.

5. A pressurized sealing device for a slurry conveying pipeline according to claim 1, characterized in that: The second clamping plate (306) and the two sets of first clamping plates (303) have the same shape and structure. They are all arc-shaped plates or arc-shaped plates composed of three folded plates. The three sets of clamping plates are evenly distributed along the annular surface of the damaged pipe (2) to be sealed. The middle part of the second clamping plate (306) is rotatably connected to the pivot seat in the middle of the connecting rod (305) through a pivot. The middle part of the first clamping plate (303) is rotatably connected to the clamping end of the corresponding clamping arm (302) through a pivot. The contact surfaces of the second clamping plate (306) and the two sets of first clamping plates (303) with the damaged pipe (2) to be sealed are all provided with pipe surface contact plates (307). The pipe surface contact plates (307) are rubber pads with anti-slip textures, which are embedded in the corresponding installation grooves opened on the clamping plate through the protrusions on the back.

6. The pressurized sealing device for a slurry conveying pipeline according to claim 1, characterized in that: The drive system is a hydraulic drive system, and a corresponding oil supply system including a hydraulic oil tank and an oil supply pipeline is also provided. Each drive system includes three sets of second cylinders (5). The three sets of second cylinders (5) are respectively set at the three corners of the triangular pipe clamp (300). Three force seats (6) are respectively provided at the two ends of the straight pipe (100) of the repair pipe (1). The three force seats (6) at each end are on the same straight line as the three corners of the pipe clamp (300). The cylinder seat of each set of second cylinders (5) is hinged to the corner of the corresponding side pipe clamp (300), and the piston end is hinged to the corresponding side force seat (6).

7. A method for pressurized sealing of a slurry conveying pipeline, characterized in that: The sealing method uses the pressurized sealing device for slurry conveying pipelines as described in any one of claims 1 to 6 to seal the damaged pipeline, and the specific steps are as follows: S1 identifies the leak point in the pipeline and removes the buried soil and debris around the leak area of ​​the damaged pipeline; S2 installs pipe clamping and fixing mechanisms on both sides of the leak area of ​​the damaged pipeline. The pipe clamping frame of each set of pipe clamping and fixing mechanisms is fixedly clamped on the outside of the damaged pipeline. Two sets of clamping mechanisms are located on both sides of the damaged pipeline, and the connecting rod is located on the upper part of the damaged pipeline. The second clamping plate and the two sets of first clamping plates on the connecting rod are adjusted so that the clamping surfaces of the three sets of clamping plates are in contact with the damaged pipeline. Oil is injected into the two first cylinders through the external hydraulic system, and the two sets of clamping arms drive the three sets of clamping plates to continuously clamp the damaged steel pipe. S3 welds annular steel sheets or reinforcing bars inside the sealing strip on both sides of the leak area of ​​the damaged steel pipe, and installs concave rubber sealing rings on the annular steel sheets and reinforcing bars. S4. Install a repair pipe near the leak area of ​​the damaged pipeline. The segments of the repair pipe are assembled into a complete sleeve that fits over the damaged pipeline and then welded together. A load-bearing seat is welded and installed on the repair pipe. S5. Install the second cylinder. The cylinder body of each set of second cylinders is hinged to the pipe clamping bracket, and the piston end is hinged to the corresponding force-bearing seat. Install the second cylinders of both drive systems. After installation, the second cylinder connected to the pipe clamping and fixing mechanism on the side adjacent to the repair pipe is in the retracted state, and the second cylinder connected to the pipe clamping and fixing mechanism on the side away from the repair pipe is in the extended state. S6. Start the second cylinders on both sides of the drive system. The second cylinders in the retracted state gradually extend to push the repair pipe toward the leak area. At the same time, the second cylinders in the extended state gradually retract to pull the repair pipe toward the leak area. Under the action of the two sets of drive systems, the repair pipe is pushed and pulled to the leak area. Under the action of the bell mouth of the repair pipe, both sealing strips are tightened to the straight pipe area of ​​the repair pipe and the leak area is completely covered. The relative position of the repair pipe and the damaged steel pipe is adjusted by the second cylinders on both sides until the pressurized sealing operation is completed.

8. A method for pressurized sealing of a slurry conveying pipeline according to claim 7, characterized in that: The sealing method is for sealing leaks in coal slurry conveying pipelines without stopping the slurry delivery.

9. A method for pressurized sealing of a slurry conveying pipeline according to claim 7, characterized in that: In step S1, the leak point is determined by the pipeline pressure. When the pressure wave changes abruptly, the location of the leak in the slurry pipeline is determined by multiplying the time difference between the occurrence of the pressure wave and the change in pressure by the wave velocity of the slurry pipeline.

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