A pigging device for hydraulically driving and rescuing blocked pipelines

Abstract

The present invention belongs to the technical field of pipeline pig rescue. The present invention relates to a pigging device for hydraulically driving and rescuing a blocked pipeline pig, which comprises a steel skeleton, a hydraulic device, a guiding and sealing device, and a positioning device; the guiding and sealing device includes a front-end and a rear-end guiding and sealing assembly, which are respectively sleeved and fixed on the front and rear parts of the steel skeleton and form a sealing contact with the inner part of the pipeline; the hydraulic device includes a gear pump, a braking device part, an impact device part, and a hydraulic pipeline part; the braking device part is arranged at a position outside the steel skeleton between the front-end guiding part assembly and the rear-end guiding and sealing assembly, and is composed of at least two groups of braking assemblies relatively fixed on both sides of the steel skeleton, the impact device part is arranged at the middle position of the front end of the steel skeleton and includes an impact hydraulic cylinder and an impact buffer pad; the gear pump and the hydraulic pipeline part are arranged in the installation cavity of the steel skeleton; the positioning device is installed at the front end of the steel skeleton. The present invention can reduce the damage to the pipeline pig and can significantly improve the success rate of rescue.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline pig rescue, and particularly relates to a pigging device for hydraulically driving and rescuing a stuck pipeline pig. Background Art

[0002] A pipeline pig is a detection device that travels with the medium in an operating oil or gas pipeline, and generally uses the principle of magnetic flux leakage method for detection. During the detection process of the existing pipeline pig in the pipeline, when encountering a ball valve that is not fully opened or a weld seam, the pipeline pig is likely to stay inside the pipeline and form a blockage. If a blockage occurs, problems such as unsmooth medium flow will be caused. Usually, a pigging device is put into the pipeline to push out the stuck pipeline pig. However, this method will cause relatively large damage to the pipeline pig, and the success rate of unblocking is not high. If it fails to be pushed out, manual excavation is required, consuming a large amount of manpower and material resources.

[0003] In the prior art, when a pipeline pig or a pigging device is stuck in the pipeline, the conventional solution is to put another pigging device into the pipeline to move the stuck pipeline pig or pigging device out of the blockage point. For example, a method for solving the blockage of a pigging device is described in "Diagnosis and Emergency Disposal of Pigging Device Blockage in Gas Transmission Pipeline - Taking Baohan Line as an Example". Before putting the pigging device, a foam pigging device is put in first to increase buffering and reduce damage to the stuck pigging device or pipeline pig. However, due to the throttling effect of the stuck pigging device or pipeline pig in the pipeline and the buffering and energy absorption effect of the foam pigging device, the success rate of rescuing the stuck pipeline pig or pigging device is reduced. If directly hitting the rear end of the stuck pipeline pig with the pigging device, although the impact force can be increased, it is easy to cause impact damage to the pipeline pig. In addition, in the case of a large blockage force, the existing method of directly driving the pigging device by the medium in the pipeline to impact and unblock the pipeline pig also has a low success rate.

[0004] The currently adopted methods for rescuing stuck pipeline pigs have not achieved both reducing damage to the stuck pipeline pigs and improving the success rate of rescuing the stuck pipeline pigs. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a pigging device for hydraulically driving and rescuing a stuck pipeline pig, which can reduce damage to the pipeline pig and significantly improve the success rate of rescue.

[0006] The above object of the present invention is achieved by the following technical solutions:

[0007] A pigging device for hydraulically driving and rescuing a stuck pipeline pig, characterized in that it comprises a steel skeleton, a hydraulic device, a guiding and sealing device, and a positioning device;

[0008] The steel framework is a cylindrical steel frame with an installation cavity inside; the guiding and sealing device includes a front-end guiding and sealing assembly and a rear-end guiding and sealing assembly, which are respectively sleeved and fixed on the front and rear parts of the steel framework and form a sealing contact with the inside of the pipeline;

[0009] The hydraulic device includes a gear pump, a braking device part, an impact device part, and a hydraulic pipeline part;

[0010] The braking device part is arranged at a position outside the steel framework between the front-end guiding part assembly and the rear-end guiding and sealing assembly, and is composed of at least two groups of braking components relatively fixed on both sides of the steel framework. Each group of braking components consists of a braking hydraulic cylinder and a braking plate; the cylinder barrel ends of the two braking hydraulic cylinders are in contact with and fixedly connected to the outer side wall of the steel framework, and the cylinder rod ends of the two braking hydraulic cylinders are arranged radially outward along the steel framework; the braking plate is an arc-shaped plate, and the middle part of the inner side of the braking plate is in contact with and fixedly connected to the cylinder rod end of the corresponding braking hydraulic cylinder;

[0011] The impact device part is arranged at the middle position of the front end of the steel framework and includes an impact hydraulic cylinder and an impact buffer pad; a fixing plate is fixedly installed at the front end of the steel framework, the impact hydraulic cylinder is fixedly installed on the fixing plate with the cylinder rod facing forward, and the impact hydraulic cylinder is placed at the front part of the installation cavity of the steel framework; the impact buffer pad is an elastic pad, which is fixedly connected to the front end of the cylinder rod of the impact hydraulic cylinder and is located outside the front end of the steel framework;

[0012] The positioning device is installed at the front end of the steel framework and is used to detect the distance between the front end of the pigging tool and the rear end of the blocked pipeline pig;

[0013] The gear pump and the hydraulic pipeline part are arranged in the installation cavity of the steel framework; the gear pump is connected to the starting end of the oil inlet of the hydraulic pipeline part and is used to input the fluid in the pipeline into the hydraulic pipeline part; the hydraulic pipeline part is used to transport hydraulic oil to the braking hydraulic cylinder and the impact hydraulic cylinder.

[0014] Moreover, two flange baffles are respectively fixedly welded on both sides of the outer cylindrical surface of the steel framework near the middle, and bolt through holes are evenly arranged in the circumferential direction on the two flange baffles; an annular groove is machined at the front end of the cylindrical steel frame, and a fluid channel communicating with the bottom of the annular groove and the installation cavity inside the steel framework is machined inside the side wall of the cylindrical steel frame; a radial partition plate is welded at a position near the middle and rear end in the installation cavity, dividing the installation cavity into a front installation cavity and a rear installation cavity; an oil inlet through hole is arranged on the radial partition plate; through holes for two oil supply pipes to pass through are respectively arranged on the opposite sides at a position between the two flange baffles on the side wall of the cylindrical steel frame.

[0015] Moreover, the front end guide seal assembly includes a front end straight plate leather cup, a front end large interval sleeve, a front end first guide leather cup, a front end small interval sleeve, and a front end second guide leather cup which are sequentially arranged in contact with each other; the diameter of the front end straight plate leather cup is smaller than the diameters of the front end first guide leather cup and the front end second guide leather cup, and the front end first guide leather cup and the front end second guide leather cup form an interference seal fit with the inner wall of the pipe; a front end flange is arranged on the front side of the front end straight plate leather cup, and the front end guide seal assembly is fixed to the front of the steel frame by installing bolts arranged in the circumferential direction through the front end flange, the front end guide assembly and the front flange baffle. The rear end guide seal assembly comprises a rear end first guide leather cup, a rear end small spacing sleeve, a rear end second guide leather cup, a rear end large spacing sleeve, and a rear end straight leather cup which are sequentially arranged in contact with each other; the diameter of the rear end straight leather cup is smaller than the diameters of the rear end first guide leather cup and the rear end second guide leather cup, and the rear end first guide leather cup and the rear end second guide leather cup form an interference seal fit with the inner wall of the pipe; a rear end flange is arranged on the rear side of the rear end straight leather cup, and the rear end guide seal assembly is fixed to the rear end of the steel frame by installing bolts arranged along the circumferential direction on the rear end flange, the rear end guide assembly and the rear flange baffle.

[0016] Moreover, the hydraulic device also includes a reverse thrust device part, which is fixedly installed on the front end of the steel frame, including a nozzle fixing plate and a nozzle; the nozzle fixing plate is an annular plate, and its sleeve is arranged on the outside of the fixing plate and is fixedly connected to the front end of the steel frame. A plurality of nozzle insertion holes are evenly distributed along the circumferential direction on the nozzle fixing plate, and a plurality of nozzles are sealed and fixed one by one at the positions of the plurality of nozzle insertion holes; a conical nozzle is arranged at the front end of each nozzle, and the rear part of each nozzle extends into the annular groove at the front end of the steel frame.

[0017] Moreover, the positioning device includes an ultrasonic proximity switch and an ultrasonic proximity switch mounting frame; the ultrasonic proximity switch mounting frame is fixed on the nozzle fixing plate at a position away from the nozzle, and the ultrasonic proximity switch is fixed on the ultrasonic proximity switch mounting frame with the detection end facing forward.

[0018] Moreover, the hydraulic pipeline part includes a two-position three-way directional control valve, a two-position four-way directional control valve, a sequence valve, a gear pump outlet pipe, a two-position three-way directional control valve pipe I, a two-position three-way directional control valve pipe II, a two-position four-way directional control valve pipe I, a two-position four-way directional control valve pipe II, and a two-position four-way directional control valve pipe III. One end of the gear pump outlet pipe is connected to the oil outlet of the gear pump, and the other end is connected to the oil port I of the two-position three-way directional control valve. One end of the two-position three-way directional control valve pipe I is connected to the oil port II of the two-position three-way directional control valve, and the other end is connected to the oil port I of the two-position four-way directional control valve. One end of the two-position three-way directional control valve pipe II is connected to the oil port III of the two-position three-way directional control valve, and the other end passes through the steel skeleton and is connected to the annular groove at the front end of the steel skeleton. The two-position four-way directional control valve pipe I is in a Y shape, with one end connected to the oil port III of the two-position four-way directional control valve, one end connected to the oil port I of the brake hydraulic cylinder, and one end connected to the impact hydraulic oil port I. The two-position four-way directional control valve pipe II is in a Y shape, with one end connected to the oil port IV of the two-position four-way directional control valve, one end connected to the oil port II of the brake hydraulic cylinder, and one end connected to the sequence valve. One end of the two-position four-way directional control valve pipe III is connected to the oil port II of the two-position four-way directional control valve, and one end is in communication with the oil in the pipeline. One end of the sequence valve is connected to the two-position four-way directional control valve pipe II, and the other end is connected to the oil port II of the impact hydraulic cylinder block.

[0019] The advantages and positive effects of the present invention are as follows:

[0020] 1. By respectively arranging guiding and sealing structures at the front and rear parts of the steel skeleton, the pigging device forms a front-back pressure difference under the action of the fluid in the pipeline, and the pigging device is pushed by the fluid in the pipeline to move close to the position of the blocked pipeline pig. Then, the distance from the rear end of the pipeline pig is detected by the positioning device. When moving to the set distance, the braking device part acts, first forms frictional contact with the inside of the pipeline to realize the positioning of the pigging device, and then the impact device part acts to apply a forward thrust to the rear end of the blocked pipeline pig to realize the unblocking operation of the blocked pipeline pig.

[0021] 2. The present invention arranges a buffer structure at the very front end of the pigging device. By contacting the tail of the pipeline pig through the buffer structure, the rigid impact on the pipeline pig is avoided, thus reducing the damage to the pipeline pig.

[0022] 3. The pigging device further arranges a hydraulic reverse push device at the front end of the steel skeleton, which can realize the reverse recovery of the pigging device itself when the rescue is unsuccessful. Description of the Drawings

[0023] Figure 1 is the overall axonometric view of the present invention;

[0024] Figure 2 is the overall side view of the present invention;

[0025] Figure 3 is the overall front view;

[0026] Figure 4 It is the rear view of the whole invention;

[0027] Figure 5 It is the cross-sectional view of the braking device and the impact device of the invention;

[0028] Figure 6 It is the longitudinal cross-sectional view of the steel framework of the invention;

[0029] Figure 7 It is the axonometric half-sectional schematic diagram of the hydraulic pipeline part of the invention;

[0030] Figure 8 It is the top view schematic diagram of the hydraulic pipeline part;

[0031] Figure 9 It is the side view schematic diagram of the hydraulic pipeline part;

[0032] Figure 10 It is the position change diagram of the braking device and the impact device;

[0033] Figure 11 It is the schematic diagram of the hydraulic circuit principle; Specific embodiments

[0034] The structure of the present invention will be further described below in conjunction with the accompanying drawings and through embodiments. It should be noted that this embodiment is narrative rather than restrictive.

[0035] As Figures 1 to 11 shown, a pigging device for rescuing blocked pipelines driven by hydraulic pressure, the inventive points of which are: including a steel framework 1, a hydraulic device 2, a guiding and sealing device 3, and a positioning device 4.

[0036] The steel framework is the basic part of this pigging device. It adopts a cylindrical steel frame provided with an inner installation cavity. On both sides of the outer circumferential surface of the cylindrical steel frame near the middle, two flange baffles 1.4 are respectively fixedly welded, and bolt through holes are uniformly arranged in the circumferential direction on the two flange baffles. An annular groove 1.1 is machined at the front end of the cylindrical steel frame, and a fluid channel 1.2 communicating with the bottom of the annular groove and the inner installation cavity of the steel framework is machined inside the side wall of the cylindrical steel frame. A radial partition 1.5 is welded at a position near the middle and rear end in the installation cavity, dividing the installation cavity into a front installation cavity 1.3 and a rear installation cavity 1.6. An oil inlet through hole 1.8 is arranged on the radial partition, and through this oil inlet hole, the fluid in the pipeline is input into the gear pump in the front installation cavity. Two installation planes are symmetrically arranged on the outer surface of the steel framework between the two flange baffles. Through holes 1.7 for the oil supply pipes to pass through are respectively arranged on the opposite sides of the side wall of the cylindrical steel frame at a position between the two flange baffles.

[0037] The guiding and sealing device includes a front-end guiding and sealing assembly and a rear-end guiding and sealing assembly. The front-end guiding and sealing assembly is sleeved and fixed on the front side of the flange baffle at the front of the cylindrical steel frame, and the rear-end guiding and sealing assembly is sleeved and fixed on the rear side of the flange baffle at the rear of the cylindrical steel frame. The front-end guiding and sealing assembly includes a front-end straight plate leather cup 3.2, a front-end large-spacing sleeve 3.3, a front-end first guiding leather cup 3.4, a front-end small-spacing sleeve 3.5, and a front-end second guiding leather cup 3.6 that are sequentially in contact from front to back. The diameter of the front-end straight plate leather cup is smaller than the diameters of the front-end first guiding leather cup and the front-end second guiding leather cup, and the diameters of the front-end first guiding leather cup and the front-end second guiding leather cup are slightly larger than the inner diameter of the pipeline, so that the two guiding leather cups form an interference sealing fit with the inner wall of the pipeline. A front-end flange 3.1 is arranged on the front side of the front-end straight plate leather cup. The front-end guiding and sealing assembly is fixedly installed by installing bolts arranged circumferentially through the front-end flange, the front-end guiding assembly, and the flange baffle at the front. The rear-end guiding and sealing assembly includes a rear-end first guiding leather cup 3.7, a rear-end small-spacing sleeve 3.8, a rear-end second guiding leather cup 3.9, a rear-end large-spacing sleeve 3.10, and a rear-end straight plate leather cup 3.11 that are sequentially in contact from front to back. The diameter of the rear-end straight plate leather cup is smaller than the diameters of the rear-end first guiding leather cup and the rear-end second guiding leather cup, and the diameters of the rear-end first guiding leather cup and the rear-end second guiding leather cup are slightly larger than the inner diameter of the pipeline, so that the two guiding leather cups form an interference sealing fit with the inner wall of the pipeline. A rear-end flange 3.12 is arranged on the rear side of the rear-end straight plate leather cup. The rear-end guiding and sealing assembly is fixedly installed by installing bolts arranged circumferentially through the rear-end flange, the rear-end guiding assembly, and the flange baffle at the rear.

[0038] The hydraulic device includes a gear pump 2.4, an impact device part 2.3, a brake device part 2.1, a hydraulic pipeline part 2.5, and a thrust reverser part 2.2. The gear pump, the impact device part, the brake device part, and the thrust reverser part are connected through the hydraulic pipeline part.

[0039] The impact device part is arranged at the middle position of the front end of the steel skeleton and includes an impact hydraulic cylinder 2.3.2 and an impact buffer pad 2.3.1. A ring-shaped fixing plate is fixedly installed at the front end of the steel skeleton through screws. The impact hydraulic cylinder is fixedly installed on the ring-shaped fixing plate in the direction of the cylinder rod through screws, and the impact hydraulic cylinder is placed at the front position of the installation cavity of the steel skeleton. The impact buffer pad is an elastic pad, which is connected to the front end of the cylinder rod of the impact hydraulic cylinder through screws and is located outside the front end of the steel skeleton. An impact hydraulic cylinder oil port I and an impact hydraulic cylinder oil port II are arranged on the impact hydraulic cylinder.

[0040] The impact hydraulic cylinder includes an impact hydraulic cylinder body, an impact hydraulic cylinder piston, and an impact hydraulic cylinder head. The impact hydraulic cylinder head is connected to the impact hydraulic cylinder body by screws, and a guiding hole for the rod portion of the impact hydraulic cylinder piston to pass through is provided on the impact hydraulic cylinder head.

[0041] The brake device part 2.1 is composed of two groups of brake assemblies relatively fixed on both sides of the steel skeleton. Each group of brake assemblies is composed of a brake hydraulic cylinder 2.1.2 and a brake plate 2.1.1. The cylinder barrel ends of the two brake hydraulic cylinders are in contact with two mounting planes on the above-mentioned steel skeleton and are fixedly connected by screws. The cylinder rod ends of the two brake hydraulic cylinders are arranged radially outward along the steel skeleton. The brake plate is an arc-shaped plate. The middle part of the inner side of the brake plate is in contact with the cylinder rod end of the corresponding brake hydraulic cylinder and is fixedly connected by screws. The specific structure of the brake hydraulic cylinder is as follows: it includes a brake hydraulic cylinder body, a brake hydraulic cylinder piston, a brake hydraulic cylinder head, and the brake hydraulic cylinder head is connected to the outer end of the brake hydraulic cylinder body by screws. The brake hydraulic cylinder body is fixed on the steel skeleton by screws. A guiding hole for the rod portion of the brake hydraulic cylinder piston to pass through is provided on the brake hydraulic cylinder head.

[0042] The reverse thrust device part is fixedly installed at the front end of the steel skeleton and includes a nozzle fixing plate 2.2.1 and nozzles 2.2.2. The nozzle fixing plate is an annular plate, which is sleeved outside the above-mentioned annular fixing plate and is fixedly connected to the front end of the steel skeleton by a circle of screws. A plurality of nozzle insertion holes are evenly distributed in the circumferential direction on the nozzle fixing plate, and a plurality of nozzles are hermetically inserted and fixed at the positions of the plurality of nozzle insertion holes. A conical nozzle is provided at the front end of each nozzle, and the rear part of each nozzle extends into the annular groove at the front end of the steel skeleton.

[0043] The hydraulic pipeline section 2.5 is used to supply hydraulic oil to the above-mentioned impact device section, brake device section and thrust reverser device section. It is mainly arranged in the inner installation cavity of the steel skeleton. It includes a two-position three-way directional control valve 2.5.1, a two-position four-way directional control valve 2.5.2, a sequence valve 2.5.3, a gear pump outlet pipe 2.5.4, a two-position three-way directional control valve pipe I 2.5.5, a two-position three-way directional control valve pipe II 2.5.6, a two-position four-way directional control valve pipe I 2.5.7, a two-position four-way directional control valve pipe II 2.5.8, and a two-position four-way directional control valve pipe III 2.5.9. One end of the gear pump outlet pipe is connected to the outlet of the gear pump, and the other end is connected to the oil port I of the two-position three-way directional control valve. One end of the two-position three-way directional control valve pipe I is connected to the oil port II of the two-position three-way directional control valve, and the other end is connected to the oil port I of the two-position four-way directional control valve. One end of the two-position three-way directional control valve pipe II is connected to the oil port III of the two-position three-way directional control valve, and the other end passes through the steel skeleton and is connected to the annular groove at the front end of the steel skeleton. The two-position four-way directional control valve pipe I is in a Y shape, one end is connected to the oil port III of the two-position four-way directional control valve, one end is connected to the oil port I of the brake hydraulic cylinder, and one end is connected to the impact hydraulic oil port I. The two-position four-way directional control valve pipe II is in a Y shape, one end is connected to the oil port IV of the two-position four-way directional control valve, one end is connected to the oil port II of the brake hydraulic cylinder, and one end is connected to the sequence valve. One end of the two-position four-way directional control valve pipe III is connected to the oil port II of the two-position four-way directional control valve, and one end is in communication with the oil in the pipeline. One end of the sequence valve is connected to the two-position four-way directional control valve pipe II, and the other end is connected to the oil port II of the impact hydraulic cylinder.

[0044] The positioning device 4 is used to detect the distance between the pigging tool and the blocked pipeline pig, and includes an ultrasonic proximity switch 4.1 and an ultrasonic proximity switch mounting bracket 4.2. The ultrasonic proximity switch mounting bracket is fixed to the nozzle fixing plate by screws at a position avoiding the nozzle, and the ultrasonic proximity switch is fixed to the ultrasonic proximity switch mounting bracket with the detection end facing forward.

[0045] In addition, the pigging tool further includes an electronic control unit, which is not shown in the drawings. The electronic control unit can be installed in the inner cavity of the steel skeleton at a position that does not affect the pipeline movement. The control unit is used to receive the detection signal of the positioning unit and perform operation control on the above-mentioned gear pump, two-position three-way directional control valve, two-position four-way directional control valve, sequence valve, etc. according to the detection signal.

[0046] This hydraulic-driven pigging tool for rescuing blocked pipeline pigs

[0047] During the operation of the pig in the pipeline, when it is about to reach the rear of the blocked pipeline pig, when the ultrasonic proximity switch receives the information of the blocked pipeline pig in the front pipeline information, it transmits the detection signal to the control unit. The control unit sends a start signal to the gear pump. The gear pump works to pump the oil in the pipeline through the oil inlet through holes on the radial partition of the steel skeleton into the gear pump, and then flows into the two-way three-way directional control valve through the oil outlet pipe of the gear pump, and then flows into the two-way four-way directional control valve through the oil pipe Ⅰ of the two-way three-way directional control valve, and then flows into the brake hydraulic cylinder block through the oil pipe Ⅱ of the two-way four-way directional control valve, thereby driving the piston of the brake hydraulic cylinder to move axially upward along the brake hydraulic cylinder block. As a result, the oil above the piston of the hydraulic cylinder flows into the two-way four-way directional control valve through the oil pipe Ⅰ of the two-way four-way directional control valve, and then flows into the pipeline through the oil pipe Ⅲ of the two-way four-way directional control valve; while the piston of the brake hydraulic cylinder moves axially upward along the brake hydraulic cylinder block, it drives the brake plate to move axially upward, so that the brake plate contacts the inner wall of the pipeline and generates friction with it. At this time, the brake plate moves from the first position A to the second position B, thus realizing the braking process.

[0048] After that, the braking device part stops the pig behind the blocked pipeline pig. The sequence valve is turned on, and the oil flows into the impact hydraulic cylinder block through the sequence valve, thereby driving the piston of the impact hydraulic cylinder to move axially forward along the impact hydraulic cylinder block. As a result, the oil at the front end of the piston of the impact hydraulic cylinder flows into the two-way four-way directional control valve through the oil pipe Ⅰ of the two-way four-way directional control valve, and then flows into the pipeline through the oil pipe Ⅲ of the two-way four-way directional control valve. While the piston of the impact hydraulic cylinder moves axially forward along the impact hydraulic cylinder block, it drives the impact buffer pad to move axially forward, thereby slowly pushing the pipeline pig. The impact buffer pad gradually moves from the first position C to the second position D, thus slowly pushing the pipeline pig out of the blocked point. When the impact device part of the pig fails to move the pipeline pig out of the blocked point successfully, through the displacement sensor inside the pig, it is detected that the pig does not move inside the pipeline, which means it fails to move out. The two-way three-way directional control valve changes direction, and the oil flows into the oil pipe Ⅱ of the two-way three-way directional control valve, and then flows into the injection nozzle through the annular groove at the front end of the steel skeleton and sprays out from the injection nozzle, pushing the pig backward to the sending end.

[0049] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art can understand that within the spirit of the present invention and the appended claims, various substitutions, changes, and modifications are possible. Therefore, the scope of the present invention is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A pigging device for hydraulically driving and rescuing blocked pipelines, characterized in that: It includes a steel skeleton, a hydraulic device, a guiding and sealing device, and a positioning device; The steel skeleton is a cylindrical steel frame with an installation cavity inside; the guiding and sealing device includes a front-end guiding and sealing assembly and a rear-end guiding and sealing assembly, which are respectively sleeved and fixed on the front and rear parts of the steel skeleton and form a sealing contact with the inside of the pipeline; The hydraulic device includes a gear pump, a braking device part, an impact device part, and a hydraulic pipeline part; The braking device part is arranged at a position outside the steel skeleton between the front-end guiding part assembly and the rear-end guiding and sealing assembly, and is composed of at least two groups of braking assemblies relatively fixed on both sides of the steel skeleton. Each group of braking assemblies consists of a braking hydraulic cylinder and a brake plate; the cylinder barrel ends of the two braking hydraulic cylinders are in contact with and fixedly connected to the outer side wall of the steel skeleton, and the cylinder rod ends of the two braking hydraulic cylinders are arranged radially outward along the steel skeleton; the brake plate is an arc-shaped plate, and the middle part of the inner side of the brake plate is in contact with and fixedly connected to the cylinder rod end of the corresponding braking hydraulic cylinder; The impact device part is arranged at the middle position of the front end of the steel skeleton and includes an impact hydraulic cylinder and an impact buffer pad; a fixing plate is fixedly installed at the front end of the steel skeleton, the impact hydraulic cylinder is fixedly installed on the fixing plate with the cylinder rod facing forward, and the impact hydraulic cylinder is arranged at the front part of the installation cavity of the steel skeleton; the impact buffer pad is an elastic pad, which is fixedly connected to the front end of the cylinder rod of the impact hydraulic cylinder and is located outside the front end of the steel skeleton; The positioning device is installed at the front end of the steel skeleton and is used to detect the distance between the front end of the pigging device and the rear end of the blocked pipeline pig; The gear pump and the hydraulic pipeline part are arranged in the installation cavity of the steel skeleton; the gear pump is connected to the starting end of the oil inlet of the hydraulic pipeline part and is used to input the fluid in the pipeline into the hydraulic pipeline part; the hydraulic pipeline part is used to transport hydraulic oil to the braking hydraulic cylinder and the impact hydraulic cylinder; The hydraulic device also includes a reverse pushing device part, which is fixedly installed at the front end of the steel skeleton and includes a nozzle fixing plate and nozzles; the nozzle fixing plate is an annular plate, which is sleeved outside the fixing plate and fixedly connected to the front end of the steel skeleton. A plurality of nozzle insertion holes are evenly distributed along the circumferential direction on the nozzle fixing plate, and a plurality of nozzles are hermetically inserted and fixed at the positions of the plurality of nozzle insertion holes; a conical nozzle is arranged at the front end of each nozzle, and the rear part of each nozzle extends into the annular groove at the front end of the steel skeleton.

2. The pigging device for hydraulically driving and rescuing blocked pipelines according to claim 1, characterized in that: Two flange baffles are respectively fixedly welded on both sides of the outer cylindrical surface of the steel skeleton near the middle, and bolt insertion holes are evenly distributed along the circumferential direction on the two flange baffles; an annular groove is machined at the front end of the cylindrical steel frame, and a fluid channel communicating with the bottom of the annular groove and the installation cavity inside the steel skeleton is machined inside the side wall of the cylindrical steel frame; a radial partition plate is welded at a position near the middle and rear end of the installation cavity to divide the installation cavity into a front installation cavity and a rear installation cavity; an oil inlet through hole is arranged on the radial partition plate; through holes for two oil supply pipes to pass through are respectively arranged on the opposite sides at the position between the two flange baffles on the side wall of the cylindrical steel frame.

3. The pigging device for hydraulic-driven rescue of blocked pipelines according to claim 2, wherein; The front-end guiding seal assembly includes a front-end straight plate leather cup, a front-end large-spacing sleeve, a front-end first guiding leather cup, a front-end small-spacing sleeve, and a front-end second guiding leather cup that are sequentially in contact from front to back; the diameter of the front-end straight plate leather cup is smaller than the diameters of the front-end first guiding leather cup and the front-end second guiding leather cup, and the front-end first guiding leather cup and the front-end second guiding leather cup form an interference sealing fit with the inner wall of the pipeline; a front-end flange is provided on the front side of the front-end straight plate leather cup, and by installing bolts arranged in the circumferential direction on the front-end flange, the front-end guiding assembly, and the front flange baffle in front, the front-end guiding seal assembly is fixed to the front part of the steel skeleton; the rear-end guiding seal assembly includes a rear-end first guiding leather cup, a rear-end small-spacing sleeve, a rear-end second guiding leather cup, a rear-end large-spacing sleeve, and a rear-end straight plate leather cup that are sequentially in contact from front to back; the diameter of the rear-end straight plate leather cup is smaller than the diameters of the rear-end first guiding leather cup and the rear-end second guiding leather cup, and the rear-end first guiding leather cup and the rear-end second guiding leather cup form an interference sealing fit with the inner wall of the pipeline; a rear-end flange is provided on the rear side of the rear-end straight plate leather cup, and by installing bolts arranged in the circumferential direction on the rear-end flange, the rear-end guiding assembly, and the rear flange baffle at the back, the rear-end guiding seal assembly is fixed to the rear part of the steel skeleton.

4. The pigging device for hydraulically driving to rescue blocked pipelines according to claim 2, wherein: The positioning device includes an ultrasonic proximity switch and an ultrasonic proximity switch mounting bracket; the ultrasonic proximity switch mounting bracket is fixed at a position on the nozzle fixing plate that avoids the nozzle, and the ultrasonic proximity switch is fixed on the ultrasonic proximity switch mounting bracket with the detection end facing forward.

5. The pigging device for hydraulically driving and rescuing blocked pipelines according to claim 2, characterized in that: The hydraulic pipeline part includes a two-position three-way directional valve, a two-position four-way directional valve, a sequence valve, a gear pump outlet pipe, a two-position three-way directional valve pipe I, a two-position three-way directional valve pipe II, a two-position four-way directional valve pipe I, a two-position four-way directional valve pipe II, and a two-position four-way directional valve pipe III; one end of the gear pump outlet pipe is connected to the oil outlet of the gear pump, and the other end is connected to the oil port I of the two-position three-way directional valve. One end of the two-position three-way directional valve pipe I is connected to the oil port II of the two-position three-way directional valve, and the other end is connected to the oil port I of the two-position four-way directional valve; one end of the two-position three-way directional valve pipe II is connected to the oil port III of the two-position three-way directional valve, and the other end passes through the steel skeleton and is connected to the annular groove at the front end of the steel skeleton; the two-position four-way directional valve pipe I is in a Y shape, one end is connected to the oil port III of the two-position four-way directional valve, one end is connected to the oil port I of the brake hydraulic cylinder, and one end is connected to the impact hydraulic oil port I; the two-position four-way directional valve pipe II is in a Y shape, one end is connected to the oil port IV of the two-position four-way directional valve, one end is connected to the oil port II of the brake hydraulic cylinder, and one end is connected to the sequence valve; one end of the two-position four-way directional valve pipe III is connected to the oil port II of the two-position four-way directional valve, and one end is in communication with the oil in the pipeline. One end of the sequence valve is connected to the two-position four-way directional valve pipe II, and the other end is connected to the oil port II of the impact hydraulic cylinder block.

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