A pipeline internal corrosion detection device for pressure pipeline

Abstract

The invention relates to the technical field of ultrasonic detection, and specifically discloses an in-pipeline corrosion detection device for a pressure pipeline, comprising a flaw detector, wherein an ultrasonic probe for scanning the pipeline is fixedly connected to the outer surface of the lower end of the flaw detector, and a connection kit for tying the flaw detector to the pipeline to be tested is provided on the outer surface of one side of the flaw detector, wherein the connection kit is composed of two groups of chains, a cross bar is fixedly connected between the two groups of chains, and a hook connected to the cross bar is connected to the outer surface of the other side of the flaw detector; a moving component for driving the flaw detector to move on the pipeline is provided on the outer surface of the lower end of the flaw detector, and by providing a connection kit on one side of the flaw detector, the flaw detector can be tied to the outer surface of pipelines of different sizes through multiple groups of chains, and the two groups of chains and the cross bar are tied to the pipeline surface, and the movement direction of the flaw detector can be limited, thereby increasing the stability of the flaw detector, and the height with the hook can be changed by rotating the adjusting rod, thereby adjusting the chain binding degree.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic detection, in particular to a device for detecting internal corrosion of a pressure pipeline. Background Art

[0002] Pressure pipelines are key infrastructure used to transport gas, liquid and slurry media in industrial production. They are widely used in many industries such as petrochemicals, electric power, and metallurgy. The transport medium is gas, liquefied gas, steam, or flammable, explosive, toxic, corrosive liquids with a maximum operating temperature higher than or equal to the standard boiling point. Due to the importance of pressure pipelines, in order to ensure that they are always in a safe operating state during normal work, it is necessary to conduct regular quality inspections on pressure pipelines. The most important of these is corrosion inspection of pressure pipelines to avoid stress concentration caused by pipeline corrosion, which may lead to safety hazards. The existing inspection method mainly uses ultrasonic detectors to accurately measure the wall thickness and corrosion inspection of the pipe wall using the ultrasonic principle. This method has high accuracy and is not limited by wall thickness or inner and outer walls.

[0003] During ultrasonic testing, coupling agent needs to be sprayed between the probe and the pipe to reduce the absorption of ultrasonic energy by air. However, most existing ultrasonic equipment uses an external pipe to continuously spray coupling agent on the detection part, which not only wastes a lot of coupling agent, but also causes the coupling agent to be sprayed unevenly due to the movement of the ultrasonic probe, leaving bubbles between the probe and the pipe, thus affecting the ultrasonic testing results.

[0004] To this end, we propose a device for detecting in-pipeline corrosion of a pressure pipeline. Summary of the invention

[0005] The object of the present invention is to provide a device for detecting corrosion in a pressure pipeline to solve the problems mentioned in the background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a pipeline corrosion detection device for a pressure pipeline, comprising a flaw detector, an ultrasonic probe for scanning the pipeline is fixedly connected to the outer surface of the lower end of the flaw detector, a connection kit for tying the flaw detector to the pipeline to be tested is provided on the outer surface of one side of the flaw detector, the connection kit is composed of two groups of chains, a cross bar is fixedly connected between the two groups of chains, and a hook connected to the cross bar is connected to the outer surface of the other side of the flaw detector;

[0007] The outer surface of the lower end of the flaw detector is provided with a moving component for driving the flaw detector to move on the pipeline, the moving component includes a groove opened on the outer surface of the lower end of the flaw detector, a motor is arranged inside the groove, a driving wheel is fixedly connected to the output end of the motor, the driving wheel is a Mecanum wheel, and a retractable rod with adjustable length is fixedly connected between the motor and the groove;

[0008] The outer surface of the lower end of the flaw detector is provided with a spray coupling agent coating component, and the coating component includes a flow channel. The flow channel is designed as a ring structure and surrounds the ultrasonic probe. The outer surface of the flaw detector is provided with an embedding groove connected to the flow channel. An infusion tube for conveying the coupling agent is embedded in the embedding groove. The end of the flow channel is designed as an inclined structure.

[0009] Among them, the outer surface of the infusion tube is provided with a socket, and a valve sheet is slidably connected inside the socket. The valve sheet and the socket are adapted to each other and maintained sealed. The height of the socket is smaller than the height of the infusion tube, and the end of the valve sheet extends to the outside of the socket.

[0010] Among them, the outer surface of the valve plate is rotatably connected to a connecting rod through a rotating shaft, the end of the connecting rod away from the valve plate is an annular structure, and is rotatably connected to a connecting rod inside it, one end of the connecting rod is fixedly connected to turntable 1, and the other end is fixedly connected to turntable 2, the axes of turntable 1 and turntable 2 coincide with each other, the end of turntable 1 away from the connecting rod is rotatably connected to a bearing, the bearing is rotatably connected to a flaw detector, and a counterweight block is provided below the annular outer surface of turntable 2.

[0011] Among them, the annular outer surface of the turntable 2 is fixedly connected with a telescopic rod, and the annular outer surface of the telescopic rod is sleeved with a telescopic sleeve, the end of the telescopic sleeve away from the turntable 2 is fixedly connected to the counterweight block, and the end of the telescopic sleeve away from the flaw detector is fixedly connected with a guide rod, the outer surface of the flaw detector is fixedly connected with a fixing rod at the position of the central circular hole of the bearing, the fixing rod passes through turntable 1 and turntable 2, and the end of the fixing rod is fixedly connected with a disk wheel, and a guide groove is provided on the outer surface of the disk wheel close to the flaw detector, and the guide rod is located inside the guide groove.

[0012] There are two groups of guide grooves, which are symmetrically distributed with the telescopic sleeve as the symmetry axis. The two groups of guide grooves are interconnected to form a closed loop, and the guide grooves are designed as a spiral structure.

[0013] Among them, the outer surface of the chain away from the cross bar is fixedly connected with several groups of protrusions, the outer surface of the lower end of the protrusion is embedded with a ball bearing, one side of the hook is fixedly connected with a sliding block, the outer surface of the upper end of the sliding block is rotatably connected with an adjusting rod via a rotating shaft, the outer surface of the adjusting rod is provided with a thread, and the outer surface of the flaw detector is fixedly connected with a limiting block threadedly connected to the adjusting rod at a corresponding position of the outer surface of the flaw detector and the adjusting rod, the sliding block is designed as a rectangular structure, and one end of it is in contact with the outer surface of the flaw detector.

[0014] The hook is formed by bending a sheet of metal, and a notch is formed at one end of the limiting block away from the flaw detector, and a gear is rotatably connected to the notch through a rotating shaft and meshes with the outer surface of the adjusting rod.

[0015] In which, the moving assembly also includes a slide plate, a slide groove is provided on the inner surface of the groove at a position corresponding to the slide plate, and the end of the slide plate is located inside the slide groove; a storage cavity is provided inside the flaw detector at a position corresponding to the motor, and an extrusion plate matching it is slidably connected inside the storage cavity; a spring 1 is fixedly connected to the outer surface of the lower end of the extrusion plate at a position corresponding to the storage cavity; a lifting rod is fixedly connected to the outer surface of the upper end of the motor; the upper end of the lifting rod extends to the inside of the storage cavity and is fixedly connected to the extrusion plate; an annular groove is provided on the outer surface of the lower end of the flaw detector, a lifting ring is slidably connected inside the annular groove, a silicone ring is fixedly connected to the outer surface of the lower end of the lifting ring, a spring 2 is fixedly connected between the lifting ring and the annular groove, and a channel is provided between the annular groove and the storage cavity, and the two are connected through the channel.

[0016] The annular groove is located on the outside of the flow channel, the silicone ring is designed as a hollow structure, and through holes are provided on the outer surfaces of the upper ends of the silicone ring and the lifting ring.

[0017] The present invention has at least the following beneficial effects:

[0018] 1. By providing a connection kit on one side of the flaw detector, the flaw detector can be tied to the outer surface of pipes of different sizes through multiple sets of chains. Two sets of chains and cross bars are tied to the surface of the pipe, which can limit the movement direction of the flaw detector and increase the stability of the flaw detector. At the same time, by rotating the adjustment rod to change the height with the hook, the tightness of the chain binding can be adjusted. The above mechanism improves the versatility of the device;

[0019] 2. By opening an inclined flow channel around the ultrasonic probe on the outer surface of the lower end of the flaw detector for spraying the coupling agent, the coupling agent can flow along the ultrasonic probe to the outer wall of the pipeline to be tested. Under the fluidity and viscosity characteristics of the coupling agent, it is easier to form a film composed of the coupling agent between the ultrasonic probe and the pipeline. The coupling agent is evenly applied to the area to be tested, which is conducive to the propagation of ultrasound and reduces the loss of ultrasonic energy. At the same time, by providing a valve sheet with a variable opening on the surface of the infusion tube, when the flaw detector is at the high point of the pipeline, the coupling agent will flow along the annular outer surface of the pipeline under the action of gravity. At this time, it is easier to form a film, which can reduce the opening of the infusion tube, reduce the flow of the coupling agent and reduce the cost of use. When the flaw detector is at the lowest point of the pipeline, the coupling agent cannot flow on the pipeline surface by gravity alone. By increasing the opening of the infusion tube, more coupling agent can be contacted with the ultrasonic probe through the flow channel, which is conducive to the formation of a coupling agent film.

[0020] 3. By setting a silicone ring on the periphery of the ultrasonic probe, when adjusting the distance between the ultrasonic probe and the pipe, the silicone ring will squeeze the outer surface of the annular pipe, isolating the ultrasonic probe in a small space, and then injecting coupling agent into the small space through the flow channel, soaking the ultrasonic probe in the coupling agent, thereby ensuring full contact between the ultrasonic probe and the coupling agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the moving component and the coating component of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the mobile assembly of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the coating assembly of the present invention;

[0025] Figure 5 For the present invention Figure 4 The enlarged structural diagram at B in the middle;

[0026] Figure 6 It is a schematic diagram of the structure of the silicone ring and the lifting ring of the present invention;

[0027] Figure 7 For the present invention Figure 6 The enlarged structural diagram at C in the middle;

[0028] Figure 8 It is a structural schematic diagram of the valve plate and the connecting rod of the present invention;

[0029] Fig. 9 It is a structural schematic diagram of the turntable 1, the connecting rod and the turntable 2 of the present invention;

[0030] Fig.10 It is a schematic diagram of the structure of the counterweight block and the disc wheel of the present invention;

[0031] Fig.11 It is a structural schematic diagram of the guide groove of the present invention;

[0032] Fig.12 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0033] Fig.13 It is a schematic diagram of the structure of the extrusion plate and the storage cavity of the present invention;

[0034] Fig.14 It is a schematic diagram of the structure of the channel and the storage cavity of the present invention;

[0035] Fig.15It is a schematic diagram of the explosion structure of the silicone ring and the lifting ring of the present invention.

[0036] In the figure: 1. flaw detector; 10. ultrasonic probe; 11. limiting block; 12. sliding block; 13. hook; 14. gear; 15. adjusting rod; 16. notch; 2. connecting kit; 20. cross bar; 21. protrusion; 22. chain; 3. moving assembly; 30. driving wheel; 31. motor; 32. retracting rod; 33. groove; 34. slide; 35. slide plate; 36. ring groove; 37. silicone ring; 38. lifting ring; 381. spring 2; 382. through hole ; 39. Spring 1; 391. Storage chamber; 392. Channel; 393. Extrusion plate; 394. Lifting rod; 4. Coating assembly; 40. Embedded groove; 41. Valve plate; 411. Socket; 42. Flow channel; 43. Infusion tube; 44. Connecting rod; 45. Counterweight; 46. Disc wheel; 47. Bearing; 48. Turntable 1; 49. Connecting rod; 50. Fixed rod; 51. Turntable 2; 52. Telescopic sleeve; 53. Guide rod; 54. Telescopic rod; 55. Guide groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1: Please refer to Figure 1-15 The present invention provides a technical solution: a pipeline corrosion detection device for a pressure pipeline, comprising a flaw detector 1, an ultrasonic probe 10 for scanning the pipeline is fixedly connected to the outer surface of the lower end of the flaw detector 1, a connection kit 2 for tying the flaw detector 1 to the pipeline to be tested is provided on the outer surface of one side of the flaw detector 1, the connection kit 2 is composed of two groups of chains 22, a cross bar 20 is fixedly connected between the two groups of the chains 22, and a hook 13 connected to the cross bar 20 is connected to the outer surface of the other side of the flaw detector 1; the two groups of chains 22 are used to tie the flaw detector 1 to the outer surface of the pipeline to be tested. Due to the characteristics of the chain 22, the connection kit 2 can tie the flaw detector 1 to pipelines of different diameters, and at the same time can limit the movement direction of the flaw detector 1 so that it will not deviate;

[0039] See also Figure 1The outer surface of the lower end of the flaw detector 1 is provided with a moving component 3 for driving the flaw detector 1 to move on the pipeline. The moving component 3 includes a groove 33 opened on the outer surface of the lower end of the flaw detector 1. A motor 31 is arranged inside the groove 33. The output end of the motor 31 is fixedly connected with a driving wheel 30, and the driving wheel 30 is a Mecanum wheel. A retractable rod 32 with adjustable length is fixedly connected between the motor 31 and the groove 33. The flaw detector 1 performs circular motion or translational motion around the outer surface of the pipeline, which is driven by the Mecanum wheel driven by the motor 31, thereby increasing the range of motion of the flaw detector 1. The distance between the flaw detector 1 and the pipeline can be adjusted by adjusting the tightness of the binding of the connection kit 2, so that a small gap is maintained between the ultrasonic probe 10 and the pipeline, which facilitates the coupling agent to form a flowing layered film in the gap, which is conducive to the passage of ultrasound and reduces the energy loss of ultrasound.

[0040] See also Figures 5 to 7 The outer surface of the lower end of the flaw detector 1 is provided with a spray coupling agent coating component 4, and the coating component 4 includes a flow channel 42. The flow channel 42 is designed as a ring structure and surrounds the ultrasonic probe 10. The outer surface of the flaw detector 1 is provided with an embedding groove 40 connected to the flow channel 42. The embedding groove 40 is embedded with an infusion tube 43 for conveying the coupling agent. The end of the flow channel 42 is designed as an inclined structure, and the inclined direction is aligned with the ultrasonic probe 10. When the coupling agent flows along the ultrasonic probe 10 to the pipeline, a thin film is formed between the ultrasonic probe 10 and the pipeline due to the viscosity of the coupling agent itself. The flow channel 42 is annular, which ensures that the coupling agent can be distributed to the outer surface of the ultrasonic probe 10, so that the coupling agent is covered on the pipeline surface. Through the coating component 4 in the above structure, a thin film formed by the coupling agent is coated between the ultrasonic probe 10 and the pipeline, which is conducive to the penetration of ultrasound. At the same time, with the assistance of the connection kit 2, the tightness of the connection kit 2 can be adjusted when facing pipelines of different diameters, so that the gap between the ultrasonic probe 10 and the pipeline can be maintained when facing pipelines of different sizes.

[0041] See also Figures 7 to 9 A socket 411 is provided on the outer surface of the infusion tube 43, and a valve plate 41 is slidably connected inside the socket 411. The valve plate 41 and the socket 411 are adapted to each other and are sealed. The height of the socket 411 is smaller than the height of the infusion tube 43. The end of the valve plate 41 extends to the outside of the socket 411. The valve plate 41 slides inside the socket 411, so that the flow rate of the coupling agent in the flow channel 42 is restricted by the valve plate 41. At the same time, the valve plate 41 is completely located inside the infusion tube 43, and a sealing gasket is provided on the surface of the valve plate 41 to prevent leakage.

[0042] See also Figures 8 to 10The outer surface of the valve plate 41 is rotatably connected to a connecting rod 44 through a rotating shaft. The end of the connecting rod 44 away from the valve plate 41 is an annular structure, and a connecting rod 49 is rotatably connected inside it. One end of the connecting rod 49 is fixedly connected to a turntable 1 48, and the other end is fixedly connected to a turntable 2 51. The axes of the turntable 1 48 and the turntable 2 51 coincide with each other. The end of the turntable 1 48 away from the connecting rod 49 is rotatably connected to a bearing 47, and the bearing 47 is rotatably connected to the flaw detector 1. A counterweight 45 is provided at a position below the annular outer surface of the turntable 2 51. By providing a counterweight 45 on the outer surface of the flaw detector 1, the counterweight 45 is always vertically downward due to its own weight. When the flaw detector 1 makes a circular motion around the pipeline, the counterweight 45 is still vertically downward. Relative to the flaw detector 1, the turntable 1 48, the turntable 2 51 and the connecting rod 4 9 rotates, and the turntable 1 48, the turntable 2 51 and the connecting rod 49 form a crankshaft structure. When the flaw detector 1 moves around the pipeline for one circle, the valve plate 41 slides back and forth along the socket 411 under the action of the connecting rod 44, the turntable 1 48 and the connecting rod 49. Through the above structure, when the flaw detector 1 moves from the highest point to the lowest point of the pipeline, the opening of the valve plate 41 gradually reaches the maximum. At this time, the ultrasonic probe 10 and the flow channel 42 of the flaw detector 1 gradually open upward, and a part of the coupling agent will fall directly to the ground under the action of gravity. In order to ensure that the coupling agent contacts the pipeline, the opening of the valve plate 41 is increased to increase the flow rate of the coupling agent, and ensure that the pipeline surface is coated with sufficient coupling agent. When the flaw detector 1 moves from the lowest point to the highest point of the pipeline again, the opening of the valve plate 41 gradually decreases to the minimum, reducing the flow rate of the coupling agent to avoid coupling agent waste.

[0043] See also Figure 8 and 9The annular outer surface of the turntable 2 51 is fixedly connected with a telescopic rod 54, and the annular outer surface of the telescopic rod 54 is sleeved with a telescopic sleeve 52. The end of the telescopic sleeve 52 away from the turntable 2 51 is fixedly connected to the counterweight 45, and the end of the telescopic sleeve 52 away from the flaw detector 1 is fixedly connected with a guide rod 53. The outer surface of the flaw detector 1 is located at the central circular hole position of the bearing 47 and is fixedly connected with a fixing rod 50. The fixing rod 50 passes through the turntable 1 48 and the turntable 2 51, and the end thereof is fixedly connected with a disk wheel 46. The outer surface of the disk wheel 46 close to the flaw detector 1 is provided with a guide groove 55, and the guide rod 53 is located inside the guide groove 55. Since the opening between the valve plate 41 and the socket 411 is affected by the counterweight 45, When the flaw detector 1 moves along the pipeline from the high point of the pipeline to the low point of the pipeline, the disc wheel 46 moves synchronously with the flaw detector 1 and rotates 180° relative to the counterweight 45. At this time, the telescopic sleeve 52, under the guidance of the guide rod 53, moves along the guide groove 55 together with the counterweight 45 gradually away from the disc wheel 46, increasing the length of the counterweight 45 to the bearing 47, thereby increasing the torque of the opening and closing valve plate 41, and further increasing the stability of the structure. When the flaw detector 1 moves from the lowest point of the pipeline to the highest point of the pipeline, the disc wheel 46 moves synchronously with the flaw detector 1 and rotates 180° again relative to the counterweight 45 to complete the reset. The counterweight 45 gradually approaches the disc wheel 46 through the guide rod 53 on the surface of the telescopic sleeve 52 to prevent the pipeline from blocking the counterweight 45.

[0044] See also Fig.10 and 11 There are two groups of guide grooves 55, and the two groups are symmetrically distributed with the telescopic sleeve 52 as the symmetry axis. The two groups of guide grooves 55 are interconnected to form a closed loop. The guide grooves 55 are designed as a spiral structure, and the bearing 47 is used as a rotating part connecting the turntable 48 to facilitate the passage of the fixing rod 50. The disk wheel 46 is fixedly connected to the flaw detector 1 through the fixing rod 50.

[0045] See also Figure 1 and 12The outer surface of the chain 22 away from the cross bar 20 is fixedly connected with a plurality of groups of protrusions 21, and the outer surface of the lower end of the protrusion 21 is embedded with a ball bearing, which reduces the friction of the chain 22 when sliding on the pipeline surface, thereby increasing the smoothness of the movement of the flaw detector 1. A sliding block 12 is fixedly connected to one side of the hook 13, and the upper outer surface of the sliding block 12 is rotatably connected with an adjusting rod 15 through a rotating shaft. The cross bar 20 in the middle of the chain 22 is embedded in the middle of the hook 13, and the flaw detector 1 is tied to the surface of the pipeline through the chain 22. The outer surface of the rod 15 is provided with a thread. The user rotates the adjusting rod 15 to pull the hook 13 upward, so that the chain 22 can bind the pipeline more tightly. The distance between the ultrasonic probe 10 and the pipeline can be adjusted by squeezing the moving component 3. The outer surface of the flaw detector 1 is fixedly connected to a limiting block 11 threadedly connected to the adjusting rod 15 at a position corresponding to the adjusting rod 15. The sliding block 12 is designed as a rectangular structure, and one end of the sliding block 12 is in contact with the outer surface of the flaw detector 1. The sliding block 12 remains stable when sliding along the side wall of the flaw detector 1.

[0046] See also Fig.12 The hook 13 is formed by bending a sheet of metal and is formed in a sheet shape, which can increase the contact area between the hook 13 and the cross bar 20, making the connection more stable. A notch 16 is formed at one end of the limiting block 11 away from the flaw detector 1. A gear 14 threadedly meshed with the outer surface of the adjusting rod 15 is rotatably connected to the inside of the notch 16 through a rotating shaft. The principle of a worm gear is used to make the adjusting rod 15 self-locking, thereby reducing the difficulty of operation.

[0047] Example 2: Please refer to Figure 3 , 13and 14, the moving assembly 3 also includes a slide plate 35, a slide groove 34 is provided on the inner surface of the groove 33 at a position corresponding to the slide plate 35, the end of the slide plate 35 is located inside the slide groove 34 and matches the slide groove 34, a storage cavity 391 is provided inside the flaw detector 1 at a position corresponding to the motor 31, a matching extrusion plate 393 is slidably connected to the storage cavity 391, a spring 39 is fixedly connected to the outer surface of the lower end of the extrusion plate 393 at a position corresponding to the storage cavity 391, a lifting rod 394 is fixedly connected to the outer surface of the upper end of the motor 31, the upper end of the lifting rod 394 extends to the inside of the storage cavity 391 and is fixedly connected to the extrusion plate 393, an annular groove 36 is provided on the outer surface of the lower end of the flaw detector 1, a lifting ring 38 is slidably connected to the inside of the annular groove 36, a silicone ring 37 is fixedly connected to the outer surface of the lower end of the lifting ring 38, a spring 2 381 is fixedly connected between the lifting ring 38 and the annular groove 36, and the annular groove 3 A channel 392 is provided between the storage chamber 391 and the storage chamber 391, and the two are connected through the channel 392. The present embodiment and the first embodiment are implemented simultaneously to achieve the best effect. When the distance between the flaw detector 1 and the pipeline is changed by rotating the adjusting rod 15, the flaw detector 1 will press the driving wheel 30 and the motor 31 to compress the retracting rod 32, and the lifting rod 394 will lift the extrusion plate 393 inside the storage chamber 391, and the air between the storage chamber 391 and the extrusion plate 393 is pressed into the annular groove 36 through the channel 392, forcing the lifting ring 38 to move downward along the annular groove 36, forcing the spring 2 381 to stretch, and squeezing the silicone ring 37 to fit the outer surface of the pipeline. With the entry of the coupling agent inside the flow channel 42, the ultrasonic probe 10 is soaked in the space formed between the silicone ring 37 and the pipeline and the flaw detector 1, and the excess coupling agent flows out along the gap between the silicone ring 37 and the pipeline. The above structure can reduce the cavity formed inside the coupling agent, and further reduce the loss of ultrasonic energy.

[0048] The position of the annular groove 36 is located on the outside of the flow channel 42. The silicone ring 37 is designed as a hollow structure, and the upper outer surfaces of the silicone ring 37 and the lifting ring 38 are provided with through holes 382. The design of the through holes 382 can inject the air inside the storage cavity 391 into the silicone ring 37 with a hollow structure through the channel 392, so that the silicone ring 37 expands, increases the contact area with the pipeline, and increases the stability of the above structure.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting internal corrosion of a pressure pipeline, comprising a flaw detector (1), wherein an ultrasonic probe (10) for scanning the pipeline is fixedly connected to the outer surface of the lower end of the flaw detector (1), and characterized in that: A connection kit (2) for tying the flaw detector (1) to the pipeline to be tested is provided on one side of the outer surface of the flaw detector (1), the connection kit (2) comprising two groups of chains (22), a cross bar (20) being fixedly connected between the two groups of chains (22), and a hook (13) docking with the cross bar (20) is connected to the other side of the outer surface of the flaw detector (1); The outer surface of the lower end of the flaw detector (1) is provided with a moving assembly (3) for driving the flaw detector (1) to move on the pipeline, the moving assembly (3) comprising a groove (33) formed on the outer surface of the lower end of the flaw detector (1), a motor (31) being provided inside the groove (33), a driving wheel (30) being fixedly connected to the output end of the motor (31), the driving wheel (30) being a Mecanum wheel, and a retractable rod (32) with adjustable length being fixedly connected between the motor (31) and the groove (33); The outer surface of the lower end of the flaw detector (1) is provided with a spray coupling agent coating component (4), the coating component (4) comprising a flow channel (42), the flow channel (42) being designed as an annular structure and surrounding the ultrasonic probe (10), the outer surface of the flaw detector (1) being provided with an embedding groove (40) communicating with the flow channel (42), an infusion tube (43) for conveying the coupling agent being embedded in the embedding groove (40), and the end of the flow channel (42) being designed as an inclined structure.

2. The device for detecting internal corrosion of a pressure pipeline according to claim 1, characterized in that: The outer surface of the infusion tube (43) is provided with a socket (411), and a valve plate (41) is slidably connected inside the socket (411). The valve plate (41) and the socket (411) are adapted to each other and are sealed. The height of the socket (411) is smaller than the height of the infusion tube (43), and the end of the valve plate (41) extends to the outside of the socket (411).

3. The internal corrosion detection device for a pressure pipeline according to claim 2 is characterized in that: The outer surface of the valve plate (41) is rotatably connected to a connecting rod (44) via a rotating shaft. The end of the connecting rod (44) away from the valve plate (41) is an annular structure, and a connecting rod (49) is rotatably connected inside the connecting rod. One end of the connecting rod (49) is fixedly connected to a turntable 1 (48), and the other end is fixedly connected to a turntable 2 (51). The axes of the turntable 1 (48) and the turntable 2 (51) coincide with each other. The end of the turntable 1 (48) away from the connecting rod (49) is rotatably connected to a bearing (47). The bearing (47) is rotatably connected to the flaw detector (1). A counterweight (45) is provided below the annular outer surface of the turntable 2 (51).

4. The internal corrosion detection device for a pressure pipeline according to claim 3 is characterized in that: A telescopic rod (54) is fixedly connected to the annular outer surface of the turntable (51), and a telescopic sleeve (52) is sleeved on the annular outer surface of the telescopic rod (54). The end of the telescopic sleeve (52) away from the turntable (51) is fixedly connected to the counterweight (45), and the end of the telescopic sleeve (52) away from the flaw detector (1) is fixedly connected to a guide rod (53). A fixing rod (50) is fixedly connected to the outer surface of the flaw detector (1) at the position of the central circular hole of the bearing (47). The fixing rod (50) passes through the turntable (48) and the turntable (51), and the end of the fixing rod (50) is fixedly connected to a disk wheel (46). A guide groove (55) is formed on the outer surface of the disk wheel (46) close to the flaw detector (1), and the guide rod (53) is located inside the guide groove (55).

5. The device for detecting internal corrosion of a pressure pipeline according to claim 4, characterized in that: The number of the guide grooves (55) is two groups, and the two groups are symmetrically distributed with the telescopic sleeve (52) as the symmetry axis. The two groups of guide grooves (55) are interconnected to form a closed loop, and the guide grooves (55) are designed as a spiral structure.

6. The device for detecting internal corrosion of a pressure pipeline according to claim 1, characterized in that: The chain (22) is fixedly connected to an outer surface away from the cross bar (20) with a plurality of groups of protrusions (21), and a ball is embedded in the outer surface of the lower end of the protrusion (21). A sliding block (12) is fixedly connected to one side of the hook (13), and an upper outer surface of the sliding block (12) is rotatably connected to an adjusting rod (15) via a rotating shaft. The outer surface of the adjusting rod (15) is provided with a thread. A limiting block (11) threadedly connected to the adjusting rod (15) is fixedly connected to the outer surface of the flaw detector (1) at a position corresponding to the adjusting rod (15). The sliding block (12) is designed as a rectangular structure, and one end of the sliding block is in contact with the outer surface of the flaw detector (1).

7. The device for detecting internal corrosion of a pressure pipeline according to claim 6, characterized in that: The hook (13) is formed by bending a sheet of metal. A notch (16) is formed at one end of the limiting block (11) away from the flaw detector (1). A gear (14) is rotatably connected to the notch (16) via a rotating shaft and is threadedly meshed with the outer surface of the adjusting rod (15).

8. The device for detecting internal corrosion of a pressure pipeline according to claim 1, characterized in that: The moving assembly (3) further comprises a slide plate (35), a slide groove (34) is provided at a position on the inner surface of the groove (33) corresponding to the slide plate (35), an end of the slide plate (35) is located inside the slide groove (34), a storage cavity (391) is provided inside the flaw detector (1) at a position corresponding to the motor (31), a matching extrusion plate (393) is slidably connected inside the storage cavity (391), a spring (39) is fixedly connected at a position corresponding to the storage cavity (391) on the outer surface of the lower end of the extrusion plate (393), and a spring (39) is fixedly connected at a position corresponding to the storage cavity (391). The outer surface of the upper end of the motor (31) is fixedly connected to the storage cavity (391). A lifting rod (394) is provided, the upper end of which extends into the storage cavity (391) and is fixedly connected to the extrusion plate (393); an annular groove (36) is provided on the outer surface of the lower end of the flaw detector (1); a lifting ring (38) is slidably connected inside the annular groove (36); a silicone ring (37) is fixedly connected to the outer surface of the lower end of the lifting ring (38); a second spring (381) is fixedly connected between the lifting ring (38) and the annular groove (36); a channel (392) is provided between the annular groove (36) and the storage cavity (391), and the two are connected via the channel (392).

9. The device for detecting internal corrosion of a pressure pipeline according to claim 8, characterized in that: The annular groove (36) is located outside the flow channel (42), the silicone ring (37) is of hollow structure design, and through holes (382) are provided on the upper outer surfaces of the silicone ring (37) and the lifting ring (38).

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