A magnetic flux leakage detector and method for accurately judging driving mileage

Abstract

The present invention discloses a magnetic flux leakage detector and method for accurately judging the driving mileage, which includes a travel recording cabin, a power supply cabin, a magnetic flux leakage detection cabin, a universal joint, rollers and driving leather cups. One side of the travel recording cabin is provided with a power supply cabin, and the side of the power supply cabin away from the travel recording cabin is provided with a magnetic flux leakage detection cabin. For this magnetic flux leakage detector and method for accurately judging the driving mileage, a travel recorder is provided. The first electromagnetic switch pushes the travel recorder to closely adhere to the inner wall of the pipeline. At this time, the sealing gasket prevents the medium in the pipeline from penetrating into the outer ring cavity and the inner ring cavity. At the same time, the electromagnetic pressure regulating valve adjusts the output air pressure of the compressed air tank so that the air pressure in the inner ring cavity is the same as the pressure in the pipeline, further preventing the medium in the pipeline from infiltrating, keeping the inner ring cavity clean, facilitating the direct irradiation of the photoelectric sensor on the inner wall of the pipeline, and then real-time monitoring the relative displacement of the inner wall of the pipeline. Multiple travel recorders compare and record data to accurately judge the driving mileage of this magnetic flux leakage detector.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic flux leakage detectors, and particularly to a magnetic flux leakage detector and method for accurately judging the driving mileage. Background Art

[0002] Long-distance transportation pipelines are usually buried underground. Their burial environment is complex, and due to geological environmental movements, the transportation pipelines are prone to damage. In order to detect the damaged position at an early stage when the pipeline is damaged in a timely manner, a magnetic flux leakage detector is required. It is found that a typical magnetic flux leakage detector in the prior art is a high-stability magnetic flux leakage detector with the patent number CN201822234171.7, which includes a magnetization detection sleeve, a front drive bowl, a rear leather bowl, a front support cylinder and a rear support cylinder. At least three groups of metering components are provided on the annular pressing plate at the bottom of the rear leather bowl. This metering component consists of a base connected to the annular pressing plate, two arms hinged to the base, a metering wheel rotatably connected between the two arms, and a meter connected to the metering wheel; a stop gasket is sleeved on the shaft screw, and the inner card of this stop gasket is embedded in the card slot on the peripheral wall of the shaft screw. A round nut is also sleeved on the shaft screw, and the outer card of the stop gasket is embedded in the stop groove on the peripheral wall of the round nut; sleeves and bearings on both sides of the sleeve are sleeved on the shaft screws at the tops of the two arms, and the metering wheel is sleeved on the sleeve and the bearings through a hub.

[0003] To sum up, the existing magnetic flux leakage detectors usually measure the walking mileage of the magnetic flux leakage detector by the number of rolling circles of the metering roller. However, in the actual use process, affected by factors such as frictional resistance, shape deviation of the roller surface, and rolling deviation, the recording of the walking mileage position is not accurate enough. Moreover, all the detection elements of the existing magnetic flux leakage detectors are completely fixed on the magnetic flux leakage detector. Once a certain detection element is damaged, it needs to be completely disassembled and repaired, which is not very practical to use. In view of the above problems, the existing equipment needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a magnetic flux leakage detector and method for accurately judging the driving mileage, so as to solve the problem that the existing magnetic flux leakage detectors usually measure the walking mileage of the magnetic flux leakage detector by the number of rolling circles of the metering roller. However, in the actual use process, affected by factors such as frictional resistance, shape deviation of the roller surface, and rolling deviation, the recording of the walking mileage position is not accurate enough. Moreover, all the detection elements of the existing magnetic flux leakage detectors are completely fixed on the magnetic flux leakage detector. Once a certain detection element is damaged, it needs to be completely disassembled and repaired as mentioned in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A magnetic flux leakage detector and method for accurately judging the driving mileage, including a travel record cabin, a power supply cabin, a magnetic flux leakage detection cabin, a universal joint, rollers and a driving leather cup. One side of the travel record cabin is provided with a power supply cabin, and the side of the power supply cabin away from the travel record cabin is provided with a magnetic flux leakage detection cabin. The travel record cabin and the power supply cabin, as well as the power supply cabin and the magnetic flux leakage detection cabin, are connected by universal joints;

[0006] The travel record cabin includes a first housing, a blind hole, a travel recorder, a first electromagnetic switch, a connecting pipe, a compressed air tank and an electromagnetic pressure regulating valve. The blind hole is opened on the surface of the first housing, and a travel recorder is slidably installed inside the blind hole. At the same time, a first electromagnetic switch is provided between the travel recorder and the blind hole. One end of the travel recorder penetrates through the connecting pipe and is slidably connected to it, and the travel recorder is communicated with the compressed air tank through the connecting pipe. The compressed air tank is buried inside the first housing, and an electromagnetic pressure regulating valve is installed at the connection between the compressed air tank and the connecting pipe;

[0007] The power supply cabin includes a second housing, a cavity, a battery pack, an emergency disconnection device, a temperature sensor, a pressure relief valve and a carbon dioxide cooling tank. A cavity is opened inside the second housing, and a battery pack and a carbon dioxide cooling tank are installed inside the cavity. A temperature sensor is installed inside the cavity. The surface of the second housing is penetrated by a pressure relief valve. The battery pack is electrically connected to external equipment through an emergency disconnection device, and the emergency disconnection device is buried inside the second housing;

[0008] The magnetic flux leakage detection cabin includes a third housing, a first sliding hole, a magnetic flux leakage detection unit, a control module and a first compression spring. A first sliding hole is opened on the surface of the third housing. One end of the magnetic flux leakage detection unit extends into the first sliding hole and is slidably connected to it. A control module is installed inside the third housing, and the control module is electrically connected to the magnetic flux leakage detection unit. A first compression spring is provided between the magnetic flux leakage detection unit and the third housing

[0009] Preferably, the universal joint includes a first shaft fork, a second shaft fork, a cross shaft, a through hole and a connecting hose. One end of the first shaft fork is rotatably connected to the cross shaft in the horizontal direction. The second shaft fork is rotatably connected to the cross shaft in the vertical direction. A through hole penetrates through the center of the cross shaft, and a connecting hose penetrates through the through hole. One end of the connecting hose is communicated with the first shaft fork, and the other end of the connecting hose is communicated with the second rear side;

[0010] By adopting the above technical solution, the first shaft fork and the second shaft fork are communicated with each other through a connecting hose, and the connecting cable passes through the inside of the connecting hose, so that the connecting cable bends slightly when the first shaft fork and the second shaft fork rotate around the cross shaft, facilitating the electrical connection to be maintained even when the first housing, the second housing and the third housing swing.

[0011] Preferably, support mechanisms are installed on the outer sides of the first housing, the second housing, and both sides of the third housing, and drive leather cups are fixed on the surfaces of the first housing, the second housing, and the third housing.

[0012] By adopting the above technical solution, the support mechanisms assist in supporting the first housing, the second housing, and the third housing, keeping the first housing, the second housing, and the third housing at the center inside the pipeline.

[0013] Preferably, the centerlines of the first housing, the second housing, and the third housing coincide. One group of rollers is provided with three rollers, and the three rollers and the centerline of the first housing are arranged in a "pin" shape.

[0014] By adopting the above technical solution, multiple groups of rollers respectively support the first housing, the second housing, and the third housing. The rollers in the "pin" shape arrangement are more stable, making the first housing, the second housing, and the third housing more stable.

[0015] Preferably, the travel recorder includes a sleeve, a gasket, an outer ring cavity, an inner ring cavity, a photoelectric sensor, and air holes. A gasket is fixed on the outer side of the sleeve, and an outer ring cavity and an inner ring cavity are formed inside the sleeve. The outer ring cavity is arranged outside the inner ring cavity. Air holes are formed inside the inner ring cavity, and a photoelectric sensor is installed inside the air holes.

[0016] By adopting the above technical solution, the gasket fits against the inner wall of the pipeline, reducing the entry of the medium inside the pipeline into the outer ring cavity and the inner ring cavity. At the same time, the gas in the compressed air tank flows into the inner ring cavity through the connecting pipe and the air holes, further preventing the medium inside the pipeline from invading the inner ring cavity by maintaining the internal and external air pressure balance.

[0017] Preferably, the emergency disconnection device includes a baffle, a second electromagnetic switch, a movable contact, and a fixed contact. The movable contact is fixedly installed on the baffle, and the movable contact is electrically connected to the battery pack. The baffle is connected to the inner wall of the cavity through the second electromagnetic switch. The fixed contact is fixedly installed inside the second housing, and the fixed contact is electrically connected to the movable contact.

[0018] By adopting the above technical solution, in an emergency, the second electromagnetic switch quickly pushes the baffle, causing the movable contact on the baffle to move away from the fixed contact and disconnect the electrical connection.

[0019] Preferably, the magnetic flux leakage detection unit includes a base, a permanent magnet, a magnetic sensor, a substrate, a steel brush, a male terminal and a female terminal. A substrate is fixedly installed on one side of the base away from the third housing, and permanent magnets are fixedly installed on both sides of the substrate. A steel brush is fixed on the side of the permanent magnet away from the substrate. A magnetic sensor is installed between the two permanent magnets and is electrically connected to the male terminal on the substrate. The female terminal on the base is electrically connected to the control module and is also electrically connected to the male terminal.

[0020] By adopting the above technical solution, the magnetic fields of the two permanent magnets are conducted to the inside of the pipeline through the steel brush. At this time, the magnetic sensor between the two permanent magnets detects the change of the magnetic field in real time, and then transmits the change of the magnetic field to the control module through the connection between the male terminal and the female terminal.

[0021] Preferably, the support mechanism includes a second sliding hole, a sliding rod, a roller and a second compression spring. The sliding rod is slidably installed inside the second sliding hole, and a second compression spring is installed between the second sliding hole and the sliding rod. The end of the sliding rod away from the sliding hole is rotatably connected to the roller. The sliding hole is opened on the surfaces of the first housing, the second housing and the third housing.

[0022] By adopting the above technical solution, when the pressure on the pressing wheel is too large, the sliding rod is pushed into the second sliding hole. When the pressure becomes small, the second compression spring pushes the sliding rod to reset. Through the above steps, a compensation effect is achieved, so that the position of the roller is finely adjusted according to the change of the inner diameter of the pipeline and the change of the traveling environment of the magnetic flux leakage detector.

[0023] Preferably, the outermost sides of the roller, the sealing gasket, the driving leather cup and the steel brush are all arranged in contact with the inner wall of the pipeline.

[0024] By adopting the above technical solution, it is convenient for the roller to support the first housing, the second housing and the third housing, convenient for the sealing gasket to seal the sleeve, convenient for the driving leather cup to seal the pipeline, and convenient for the permanent magnet to transmit the magnetic field to the pipe wall through the steel brush.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: The magnetic flux leakage detector and method for accurately judging the driving mileage

[0026] (1) A travel recorder is provided. The first electromagnetic switch pushes the travel recorder against the inner wall of the pipeline. At this time, the sealing gasket prevents the medium in the pipeline from penetrating into the outer ring cavity and the inner ring cavity. At the same time, the electromagnetic pressure regulating valve adjusts the output air pressure of the compressed air tank so that the air pressure in the inner ring cavity is the same as the pressure in the pipeline, further preventing the medium in the pipeline from penetrating, keeping the inner ring cavity clean, facilitating the direct irradiation of the photoelectric sensor on the inner wall of the pipeline, and then real-time monitoring the relative displacement of the inner wall of the pipeline. Multiple travel recorders compare and record data to accurately judge the driving mileage of the magnetic flux leakage detector.

[0027] (2) A magnetic leakage detection unit is provided. The base is installed inside the first sliding hole of the third housing. The substrate is fixedly installed on the base by bolts, and the magnetic sensor is quickly connected through the insertion between the male terminal and the female terminal. By rotating and removing the bolts, the base and the components on the base can be quickly pulled out, simplifying the maintenance steps;

[0028] (3) An emergency disconnection device and a carbon dioxide cooling tank are provided. The temperature sensor in the cavity detects the operating state of the battery pack in real time. Once it is found that the operating temperature is too high, the second electromagnetic switch quickly pushes the baffle to move, so that the movable contact on the baffle is disconnected from the fixed contact on the second housing. Subsequently, the carbon dioxide cooling tank is opened, and the vaporized carbon dioxide absorbs a large amount of heat. The expanded gas is discharged from the pressure relief valve to prevent the battery pack from catching fire and igniting the medium in the pipeline;

[0029] (4) A universal joint is provided. Both between the power supply compartment and the travel record compartment and between the power supply compartment and the magnetic leakage detection compartment are connected through universal joints. The universal joint is composed of a first shaft fork, a second shaft fork and a cross shaft, and the first shaft fork and the second shaft fork are connected through a connecting hose. There is a channel isolated from the pipeline between the power supply compartment and the travel record compartment and between the power supply compartment and the magnetic leakage detection compartment. Connecting cables can pass through this channel, enabling the magnetic leakage detector to series the travel record compartment, the power supply compartment and the magnetic leakage detection compartment while taking into account swing compensation, facilitating the maintenance of data connection and electrical connection between each compartment when the magnetic leakage detector operates in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the schematic diagram of the main view sectional structure of the present invention;

[0031] Figure 2 is the present invention Figure 1 enlarged schematic diagram of part A in;

[0032] Figure 3 is the present invention Figure 1 enlarged schematic diagram of part B in;

[0033] Figure 4 is the present invention Figure 1 enlarged schematic diagram of part C in;

[0034] Figure 5 is the present invention Figure 1 enlarged schematic diagram of part D in;

[0035] Figure 6 is the schematic diagram of the side view sectional structure of the first housing of the present invention;

[0036] Figure 7 is the schematic diagram of the side view sectional structure of the travel recorder of the present invention;

[0037] Figure 8 This is a schematic side cross-sectional structure diagram of the housing of the present invention;

[0038] Figure 9 This is a schematic three-dimensional sectional structure diagram of the trip recorder of the present invention.

[0039] In the figure: 1, trip recording compartment; 2, power supply compartment; 3, magnetic flux leakage detection compartment; 4, universal joint; 41, first shaft fork; 42, second shaft fork; 43, cross shaft; 44, through hole; 45, connecting hose; 5, first housing; 6, blind hole; 7, trip recorder; 71, sleeve; 72, gasket; 73, outer ring cavity; 74, inner ring cavity; 75, photoelectric sensor; 76, air hole; 8, first electromagnetic switch; 9, connecting pipe; 10, compressed air tank; 11, electromagnetic pressure regulating valve; 12, second housing; 13, cavity; 14, battery pack; 15, emergency break contact device; 151, baffle; 152, second electromagnetic switch; 153, movable contact; 154, fixed contact; 16, temperature sensor; 17, pressure relief valve; 18, carbon dioxide cooling tank; 19, third housing; 20, first sliding hole; 21, magnetic flux leakage detection unit; 211, base; 212, permanent magnet; 213, magnetic sensor; 214, substrate; 215, steel brush; 216, male terminal; 217, female terminal; 22, control module; 23, first compression spring; 24, support mechanism; 241, second sliding hole; 242, sliding rod; 243, roller; 244, second compression spring; 25, drive leather cup. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1 - 9 , the present invention provides a technical solution: a magnetic flux leakage detector and method for accurately judging the driving mileage, as Figure 1 and Figure 3 shown, a power supply compartment 2 is arranged on one side of the trip recording compartment 1, and a magnetic flux leakage detection compartment 3 is arranged on the side of the power supply compartment 2 away from the trip recording compartment 1. The trip recording compartment 1 and the power supply compartment 2, as well as the power supply compartment 2 and the magnetic flux leakage detection compartment 3, are all connected by a universal joint 4.

[0042] In a further embodiment, the universal joint 4 includes a first shaft fork 41, a second shaft fork 42, a cross shaft 43, a through hole 44, and a connecting hose 45. One end of the first shaft fork 41 is rotatably connected to the cross shaft 43 in the horizontal direction, and the second shaft fork 42 is rotatably connected to the cross shaft 43 in the vertical direction. A through hole 44 runs through the center of the cross shaft 43, and a connecting hose 45 runs through the inside of the through hole 44. One end of the connecting hose 45 is connected to the first shaft fork 41 in communication, and the other end of the connecting hose 45 is connected to the second rear side in communication. The first shaft fork 41 and the cross shaft 43 rotate in the horizontal direction, and the second shaft fork 42 and the cross shaft 43 rotate in the vertical direction. When the first shaft fork 41 and the second shaft fork 42 rotate, they are always kept in communication through the connecting hose 45, which facilitates the electrical connection between the various cabin sections.

[0043] As Figure 1 and Figure 6 shown, the support mechanism 24 includes a second sliding hole 241, a sliding rod 242, a roller 243, and a second compression spring 244. The sliding rod 242 is slidably installed inside the second sliding hole 241, and a second compression spring 244 is installed between the second sliding hole 241 and the sliding rod 242. A roller 243 is rotatably connected to the end of the sliding rod 242 away from the sliding hole. The sliding hole is opened on the surface of the first housing 5, the surface of the second housing 12, and the surface of the third housing 19. The second compression spring 244 pushes the sliding rod 242, so that the roller 243 on the sliding rod 242 presses against the inner wall of the pipeline. The sliding rod 242 has a certain sliding stroke in the second sliding hole 241, which facilitates the automatic compensation of the position of the sliding rod 242 in the second sliding hole 241 as the inner diameter of the pipeline and the pipeline path change.

[0044] In a further embodiment, the outermost sides of the roller 243, the sealing gasket 72, the driving leather cup 25, and the steel brush 215 are all arranged to fit the inner wall of the pipeline. The driving leather cup 25 increases the area of blocking the pipeline, which facilitates the medium flowing in the pipeline to push the leakage magnetic detector by pushing the driving leather cup 25.

[0045] As Figure 1 、 Figure 2 and Figure 7 shown, the travel recording cabin 1 includes a first housing 5, a blind hole 6, a travel recorder 7, a first electromagnetic switch 8, a connecting pipe 9, a compressed air tank 10, and an electromagnetic pressure regulating valve 11. The blind hole 6 is opened on the surface of the first housing 5, and a travel recorder 7 is slidably installed inside the blind hole 6. At the same time, a first electromagnetic switch 8 is arranged between the travel recorder 7 and the blind hole 6. One end of the travel recorder 7 penetrates through the connecting pipe 9 and is slidably connected thereto, and the travel recorder 7 is communicated with the compressed air tank 10 through the connecting pipe 9. The compressed air tank 10 is buried inside the first housing 5, and an electromagnetic pressure regulating valve 11 is installed at the communication part between the compressed air tank 10 and the connecting pipe 9.

[0046] In a further embodiment, support mechanisms 24 are installed on the outer sides of the first housing 5, the second housing 12, and both sides of the third housing 19, and drive leather cups 25 are fixed on the surfaces of the first housing 5, the second housing 12, and the third housing 19. The support mechanisms 24 serve to support the first housing 5, the second housing 12, and the third housing 19, suspending the first housing 5, the second housing 12, and the third housing 19 in the center of the pipeline.

[0047] As Figure 2 and Figure 7 shown, the centerlines of the first housing 5, the second housing 12, and the third housing 19 coincide. One group of the rollers 243 has three rollers, and the three rollers 243 and the centerline of the first housing 5 are arranged in a "pin" shape. The three rollers 243 arranged in a "pin" shape are more stable in force, making the positions of the first housing 5, the second housing 12, and the third housing 19 more stable inside the pipeline.

[0048] In a further embodiment, the travel recorder 7 includes a sleeve 71, a gasket 72, an outer ring cavity 73, an inner ring cavity 74, a photoelectric sensor 75, and air holes 76. A gasket 72 is fixed on the outer side of the sleeve 71, and an outer ring cavity 73 and an inner ring cavity 74 are provided inside the sleeve 71. At the same time, the outer ring cavity 73 is arranged outside the inner ring cavity 74. Air holes 76 are provided inside the inner ring cavity 74, and a photoelectric sensor 75 is installed inside the air holes 76. The gasket 72 fills the gap, reducing the inflow of the medium in the pipeline into the outer ring cavity 73 and the inner ring cavity 74. The gas transported by the compressed air tank 10 increases the air pressure inside the inner ring cavity 74, further hindering the infiltration of the medium in the pipeline through air pressure balance, facilitating the direct irradiation of the photoelectric sensor 75 on the inner wall of the pipeline, and then detecting the relative displacement between the photoelectric sensor 75 and the inner wall of the pipeline.

[0049] As Figure 1 and Figure 4 shown, the power supply compartment 2 includes a second housing 12, a cavity 13, a battery pack 14, an emergency disconnection device 15, a temperature sensor 16, a pressure relief valve 17, and a carbon dioxide cooling tank 18. A cavity 13 is provided inside the second housing 12, and a battery pack 14 and a carbon dioxide cooling tank 18 are installed inside the cavity 13. A temperature sensor 16 is installed inside the cavity 13. A pressure relief valve 17 penetrates through the surface of the second housing 12. The battery pack 14 is electrically connected to external devices through the emergency disconnection device 15, and the emergency disconnection device 15 is embedded inside the second housing 12.

[0050] In a further embodiment, the emergency disconnection device 15 includes a baffle 151, a second electromagnetic switch 152, a movable contact 153 and a fixed contact 154. The movable contact 153 is fixedly installed on the baffle 151 and is electrically connected to the battery pack 14. The baffle 151 is connected to the inner wall of the cavity 13 through the second electromagnetic switch 152. The fixed contact 154 is fixedly installed inside the second housing 12 and is electrically connected to the movable contact 153. In an emergency, the second electromagnetic switch 152 quickly pushes the baffle 151 to move, so that the movable contact 153 on the baffle 151 is disengaged from the fixed contact 154 on the second housing 12, cutting off the electrical connection between the battery pack 14 and the outside.

[0051] As Figure 1 , Figure 5 and Figure 8 shown, the magnetic leakage detection chamber 3 includes a third housing 19, a first sliding hole 20, a magnetic leakage detection unit 21, a control module 22 and a first compression spring 23. A first sliding hole 20 is formed on the surface of the third housing 19. One end of the magnetic leakage detection unit 21 extends into the first sliding hole 20 and is slidably connected thereto. A control module 22 is installed inside the third housing 19 and is electrically connected to the magnetic leakage detection unit 21. A first compression spring 23 is provided between the magnetic leakage detection unit 21 and the third housing 19.

[0052] In a further embodiment, the magnetic leakage detection unit 21 includes a base 211, a permanent magnet 212, a magnetic sensor 213, a substrate 214, a steel brush 215, a male terminal 216 and a female terminal 217. A substrate 214 is fixedly installed on one side of the base 211 away from the third housing 19, and permanent magnets 212 are fixedly installed on both sides of the substrate 214. A steel brush 215 is fixed on the side of the permanent magnet 212 away from the substrate 214. A magnetic sensor 213 is installed between the two permanent magnets 212 and is electrically connected to the male terminal 216 on the substrate 214. The female terminal 217 on the base 211 is electrically connected to the control module 22 and is also electrically connected to the male terminal 216. The magnetic field of the permanent magnet 212 is transmitted to the inner wall of the pipeline through the steel brush 215. The magnetic sensor 213 between the two permanent magnets 212 monitors the change of the magnetic field in real time and sends the monitoring information to the control module 22 through the male terminal 216 and the female terminal 217. Multiple magnetic leakage detection units 21 are arranged staggeredly, which is convenient for detecting the entire inner wall of the pipeline for flaw detection. At the same time, the base 211 and the substrate 214 are fixedly connected by bolts. Loosen the bolts and pull out the substrate 214 to disconnect the male terminal 216 on the substrate 214 from the female terminal 217 on the base 211, which is convenient for quickly replacing the substrate 214 and other detection components on the substrate 214.

[0053] During use, place the magnetic flux leakage detector inside the pipeline. The drive leather cups 25 on the first housing 5, the second housing 12, and the third housing 19 block the pipeline. Under the pressure of the medium inside the pipeline, the drive leather cups 25 are pushed, and then the magnetic flux leakage detector moves inside the pipeline. At the same time, the sleeve 71 fits against the inner wall of the pipeline through the gasket 72, and the gasket 72 prevents the medium inside the pipeline from invading the outer ring cavity 73 and the inner ring cavity 74. The compressed air tank 10 delivers air into the inner ring cavity 74 through the connecting pipe 9 and the air hole 76. The electromagnetic pressure regulating valve 11 adjusts the output air pressure of the compressed air tank 10 to make the air pressure inside the inner ring cavity 74 the same as the pressure inside the pipeline, further preventing the medium inside the pipeline from seeping in and avoiding the photoelectric sensor 75 being blocked by the medium inside the pipeline. Subsequently, the photoelectric sensor 75 irradiates the inner wall of the pipeline and monitors the relative movement between the photoelectric sensor 75 and the inner wall of the pipeline. Multiple travel recorders 7 cooperate to monitor and compare data with each other, greatly improving the travel monitoring accuracy of the magnetic flux leakage detector. The temperature sensor 16 monitors the temperature inside the cavity 13 in real time. Once it is found that the battery pack 14 is overheated, the second electromagnetic switch 152 quickly pushes the baffle 151, so that the movable contact 153 on the baffle 151 is disconnected from the fixed contact 154 on the second housing 12. At this time, the battery pack 14 is disconnected from the outside electrically. At the same time, the carbon dioxide cooling tank 18 is opened, the carbon dioxide vaporizes and absorbs heat, and the expanded gas is discharged from the pressure relief valve 17. The emergency fire extinguishing structure is used to eliminate the fire hazard of the battery pack 14, and at the same time, it is avoided that the medium inside the pipeline is ignited and further losses are caused. The steel brush 215 on the permanent magnet 212 is pressed against the inner wall of the pipeline, so that the magnetic field of the permanent magnet 212 is transmitted to the inner wall of the pipeline through the steel brush 215, which is convenient for the magnetic sensor 213 between the two permanent magnets 212 to detect the magnetic field change. Subsequently, the detected transmission is sent to the control module 22 through the male terminal 216 and the female terminal 217. Multiple magnetic flux leakage detection units 21 are arranged alternately, which is convenient for detecting the entire pipeline. The substrate 214 in the magnetic flux leakage detection unit 21 is connected to the base 211 through bolts. Rotate and remove the bolts, pull out the substrate 214, and separate the male terminal 216 from the female terminal 217 to remove the substrate 214, which is convenient for quickly disassembling and replacing the substrate 214 and the components thereon. When the magnetic flux leakage detector passes through a section with a change in pipe diameter or a pipeline bend, the sliding rod 242 slides and contracts in the second sliding hole 241, the travel recorder 7 slides and contracts in the blind hole 6, and the magnetic flux leakage detection unit 21 slides and contracts in the first sliding hole 20. At the same time, the first shaft fork 41 rotates horizontally around the cross shaft 43 and the second shaft fork 42 rotates vertically around the cross shaft 43. Through the above fine adjustment, it is convenient for the magnetic flux leakage detector to adapt to the changes in the pipeline path. A connecting hose 45 passing through the cross shaft 43 is arranged between the first shaft fork 41 and the second shaft fork 42, which is convenient for placing a connecting cable inside the first shaft fork 41, the second shaft fork 42, and the connecting hose 45, so that the travel recording compartment 1 and the power supply compartment 2 and between the power supply compartment 2 and the magnetic flux leakage detection compartment 3 are always kept electrically connected.

[0054] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0055] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only a simplified description for facilitating the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the protected content of the present invention.

[0056] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A magnetic flux leakage detector for accurately judging the driving mileage, comprising a travel record cabin (1), a power supply cabin (2), a magnetic flux leakage detection cabin (3), a universal joint (4), a roller (243) and a driving leather cup (25), characterized in that: On one side of the travel record cabin (1), there is a power supply cabin (2), and on the side of the power supply cabin (2) away from the travel record cabin (1), there is a magnetic leakage detection cabin (3). The travel record cabin (1) and the power supply cabin (2), as well as the power supply cabin (2) and the magnetic leakage detection cabin (3), are all connected by a universal joint (4). The travel record cabin (1) includes a first housing (5), a blind hole (6), a travel recorder (7), a first electromagnetic switch (8), a connecting pipe (9), a compressed air tank (10), and an electromagnetic pressure regulating valve (11). The blind hole (6) is opened on the surface of the first housing (5), and a travel recorder (7) is slidably installed inside the blind hole (6). At the same time, a first electromagnetic switch (8) is provided between the travel recorder (7) and the blind hole (6). One end of the travel recorder (7) penetrates through the connecting pipe (9) and is slidably connected to it, and the travel recorder (7) is communicated with the compressed air tank (10) through the connecting pipe (9). The compressed air tank (10) is buried inside the first housing (5), and an electromagnetic pressure regulating valve (11) is installed at the communication part of the compressed air tank (10) and the connecting pipe (9). The power supply cabin (2) includes a second housing (12), a cavity (13), a battery pack (14), an emergency disconnection device (15), a temperature sensor (16), a pressure relief valve (17), and a carbon dioxide cooling tank (18). A cavity (13) is opened inside the second housing (12), and a battery pack (14) and a carbon dioxide cooling tank (18) are installed inside the cavity (13). A temperature sensor (16) is installed inside the cavity (13). The pressure relief valve (17) penetrates through the surface of the second housing (12). The battery pack (14) is electrically connected to an external device through the emergency disconnection device (15), and the emergency disconnection device (15) is buried inside the second housing (12). The magnetic leakage detection cabin (3) includes a third housing (19), a first sliding hole (20), a magnetic leakage detection unit (21), a control module (22), and a first compression spring (23). A first sliding hole (20) is opened on the surface of the third housing (19). One end of the magnetic leakage detection unit (21) extends into the first sliding hole (20) and is slidably connected to it. A control module (22) is installed inside the third housing (19), and the control module (22) is electrically connected to the magnetic leakage detection unit (21). A first compression spring (23) is provided between the magnetic leakage detection unit (21) and the third housing (19).

2. The magnetic flux leakage detector for accurately judging the driving mileage according to claim 1, characterized in that: The universal joint (4) includes a first shaft fork (41), a second shaft fork (42), a cross shaft (43), a through hole (44), and a connecting hose (45). One end of the first shaft fork (41) is rotatably connected to the cross shaft (43) in the horizontal direction. The second shaft fork (42) is rotatably connected to the cross shaft (43) in the vertical direction. The center of the cross shaft (43) is penetrated by a through hole (44), and a connecting hose (45) penetrates through the through hole (44). One end of the connecting hose (45) is communicated with the first shaft fork (41), and the other end of the connecting hose (45) is communicated with the second rear side.

3. The magnetic flux leakage detector for accurately judging the driving mileage according to claim 1, wherein: Support mechanisms (24) are installed on the outer sides of the first housing (5), the outer side of the second housing (12), and both sides of the third housing (19), and drive leather cups (25) are fixed on the surfaces of the first housing (5), the second housing (12), and the third housing (19).

4. The magnetic flux leakage detector for accurately judging the driving mileage according to claim 1, characterized in that: The centerlines of the first housing (5), the second housing (12), and the third housing (19) coincide. One set of the rollers (243) has three, and the three rollers (243) are arranged in a "pin" shape centered on the centerline of the first housing (5).

5. The magnetic flux leakage detector for accurately judging the driving mileage according to claim 1, wherein: The travel recorder (7) includes a sleeve (71), a gasket (72), an outer ring cavity (73), an inner ring cavity (74), a photoelectric sensor (75), and air holes (76). A gasket (72) is fixed on the outer side of the sleeve (71), and an outer ring cavity (73) and an inner ring cavity (74) are formed inside the sleeve (71). At the same time, the outer ring cavity (73) is arranged outside the inner ring cavity (74). Air holes (76) are formed inside the inner ring cavity (74), and a photoelectric sensor (75) is installed inside the air holes (76).

6. The magnetic flux leakage detector for accurately judging the driving mileage according to claim 1, characterized in that: The emergency break contact device (15) includes a baffle (151), a second electromagnetic switch (152), a movable contact (153), and a fixed contact (154). The movable contact (153) is fixedly installed on the baffle (151), and the movable contact (153) is electrically connected to the battery pack (14). The baffle (151) is connected to the inner wall of the cavity (13) through the second electromagnetic switch (152). The fixed contact (154) is fixedly installed inside the second housing (12), and the fixed contact (154) is electrically connected to the movable contact (153).

7. The magnetic flux leakage detector for accurately judging the driving mileage according to claim 1, wherein: The magnetic leakage detection unit (21) includes a base (211), a permanent magnet (212), a magnetic sensor (213), a substrate (214), a steel brush (215), a male terminal (216), and a female terminal (217). A substrate (214) is fixedly installed on one side of the base (211) away from the third housing (19), and permanent magnets (212) are fixedly installed on both sides of the substrate (214). A steel brush (215) is fixed on the side of the permanent magnet (212) away from the substrate (214). A magnetic sensor (213) is installed between the two permanent magnets (212), and the magnetic sensor (213) is electrically connected to the male terminal (216) on the substrate (214). The female terminal (217) on the base (211) is electrically connected to the control module (22), and the female terminal (217) is electrically connected to the male terminal (216).

8. The magnetic flux leakage detector for accurately judging the driving mileage according to claim 3, characterized in that: The support mechanism (24) includes a second sliding hole (241), a sliding rod (242), a roller (243) and a second compression spring (244). The sliding rod (242) is slidably installed inside the second sliding hole (241), and a second compression spring (244) is installed between the second sliding hole (241) and the sliding rod (242). A roller (243) is rotatably connected to the end of the sliding rod (242) away from the sliding hole. The sliding hole is formed on the surfaces of the first housing (5), the second housing (12) and the third housing (19).

9. The magnetic flux leakage detector for accurately judging the driving mileage according to claim 8, characterized in that: The outermost sides of the roller (243), the sealing gasket (72), the driving leather cup (25) and the steel brush (215) are all arranged in contact with the inner wall of the pipeline.

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