Small-caliber steel pipe accurate detection device based on electromagnetic eddy current technology

Abstract

The utility model discloses a small-caliber steel pipe accurate detection device based on electromagnetic eddy current technology, which belongs to the technical field of pipeline detection, and comprises a probe car and a car body which are hinged with each other, a winding and a control panel which are electrically connected are arranged in the probe car, the control panel is in signal connection with an external user terminal, and the winding and the control panel are both electrically connected with a battery. The outer wall of the probe vehicle is fixedly connected with a leather cup, and a brake mechanism is arranged in the vehicle body. The leather cup is adopted to replace a wheel in the prior art, axial force is applied to the leather cup through hydraulic pressure, the vehicle body is driven to move, and the technical problems that in the prior art, errors are large due to wheel slipping or jamming, and the positioning accuracy of the corrosion position of a pipeline is low are solved. Through the synergistic effect of the electric push rod, the connecting rod, the sliding rod and the brake ball, the detection device stops at the defective position in the pipeline, so that the defective position in the pipeline is locked through the positioner, and the corrosion position is accurately positioned through the positioner.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline detection, and specifically relates to a precise detection device for small-diameter steel pipes based on electromagnetic eddy current technology. Background Art

[0002] For oilfield systems, gathering and transportation pipelines not only protect the environment surrounding the oilfield's production area but also provide a good guarantee for the safety of workers. However, the current probability of corrosion in oilfield gathering and transportation pipelines is high, affected by factors such as the internal transmission medium, the external environment, and defects in the gathering and transportation pipelines themselves. Once the gathering and transportation pipelines are corroded, the normal operation of the oilfield system will be directly affected. Detecting corrosion and strengthening protective measures are of great practical significance.

[0003] The petroleum and petrochemical industries utilize a large number of small-diameter pipelines, most of which are made of carbon steel. Due to the complexity of the media being transported, particularly in single-well pipelines, gathering and transportation pipelines, water injection pipelines, and refinery process pipelines, these transport media include produced fluids, oily wastewater, crude oil with water, and reinjection water. These media are often highly mineralized, contain Cl₁₆, H₂S, CO₂, and are exposed to temperatures, making them highly corrosive. Over time, industrial pipelines are susceptible to corrosion and thinning, leading to pipe failure and even corrosion leaks, which can lead to fires and explosions. Mandatory periodic inspections ensure the quality of in-service industrial pipelines. Therefore, in addition to regular inspections, corrosion detection for industrial pipelines requires increased investment in in-service inspection technologies and regular corrosion defect scans. Therefore, detecting and monitoring steel pipe corrosion is particularly important. Currently, steel pipe corrosion detection relies primarily on manual inspections and non-destructive testing techniques. Among these, electromagnetic eddy current testing is a commonly used non-destructive testing technique, which uses electromagnetic induction to detect surface defects and corrosion on steel pipes. Electromagnetic eddy current detection technology has the advantages of high sensitivity, high accuracy and non-destructiveness, so it is widely used in the field of steel pipe corrosion detection.

[0004] Currently, pipeline inspections primarily use water pressure testing, ultrasonic spot detection, digital radiography, pulsed eddy current, and infrared thermal imaging to detect thinning defects in industrial pipelines. Water pressure testing is a common inspection method used on-site. A cement truck connects one end of the pipeline to a testing station. The truck pumps water under a constant pressure from one end to the other. If the pressure in the pipeline does not drop over a period of time, the pipeline is leak-free. However, this inspection method is cumbersome, unable to accurately identify the specific location of the leak, and time-consuming. Ultrasonic spot detection measures metal wall thickness, enabling online high-temperature testing. However, it only collects data point by point, resulting in slow inspection speeds. Digital radiography can be used to detect corrosion on insulated industrial pipelines. However, due to the need for a protective zone, this inspection technology is generally only suitable for nighttime operations. In actual applications, digital radiography is primarily advantageous for detecting weld defects and is less commonly used for pipe corrosion detection.

[0005] Chinese utility model patent publication number CN207181364U discloses an electromagnetic eddy current internal inspection system for steel pipe corrosion. The system comprises a tractor head, a probe car A, a control car, a probe car BC, a battery car, a mileage recording car, and a switch car, all connected in sequence via universal joints. The tractor head comprises a tractor body, the front end of which is equipped with two sets of traction cups, an intermediate pressure ring between the two sets of traction cups, and a front pressure ring on the outer side of the traction cups. The front pressure ring, traction cups, and intermediate pressure ring are fixed to the tractor body. The rear end of the tractor body is equipped with a set of traction cups and a double-ear flange, which are fixed to the tractor body. This detection system can accurately detect and evaluate the corrosion condition of steel pipes, is easy to operate, and is compact. The electromagnetic eddy current detection system designed in this patent overcomes these limitations and significantly reduces the size of the equipment. However, the aforementioned patent suffers from the following problems in use: the probe car cannot stay at the location of the pipeline corrosion. The wheel records the distance traveled by the wheels against the pipeline, which can cause large errors due to wheel slippage or jamming, resulting in low accuracy in locating the pipeline corrosion location. Utility Model Content

[0006] The purpose of the utility model is to provide a small-diameter steel pipe precision detection device based on electromagnetic eddy current technology, which solves the technical problems of the prior art in that wheel slippage or jamming causes large errors and low accuracy in locating the corrosion position of the pipeline.

[0007] The technical solution adopted by the present invention is a small-diameter steel pipe precision detection device based on electromagnetic eddy current technology, including a probe car and a car body that are hinged to each other, an electrically connected winding and a control board are provided in the probe car, the control board is connected to the external user terminal signal, the winding and the control board are electrically connected to a battery, a leather cup is fixed to the outer wall of the probe car, and a brake mechanism is provided in the car body.

[0008] The utility model is also characterized in that:

[0009] The probe vehicle and the vehicle body are articulated through a universal joint.

[0010] There is a locator inside the probe car.

[0011] The brake mechanism includes a connecting column fixedly connected to the vehicle body, an electric push rod is sleeved on the connecting column, the output end of the electric push rod is hinged with two symmetrically arranged connecting rods, and the end of the connecting rod away from the output end of the electric push rod is hinged with a sliding rod; the electric push rod is symmetrically fixed with connecting rods on both sides corresponding to the connecting rod, the end of the connecting rod away from the electric push rod is fixed with an inclined sliding sleeve, the sliding rod is slidably connected along the inner cavity of the inclined sliding sleeve, and the end of the sliding rod away from the connecting rod is fixed with a brake ball; an opening is opened on the vehicle body, and the sliding rod drives the brake ball to extend out of the opening.

[0012] The brake ball is a rubber ball.

[0013] The longitudinal section of the leather cup is trapezoidal, the leather cup is sleeved on the outer wall of the probe vehicle, and the leather cup opens on one side of the vehicle body.

[0014] The user terminal is a mobile phone or a remote control.

[0015] The beneficial effects of the utility model are:

[0016] The present invention replaces the wheels in the prior art with leather cups, applying axial force to the cups through hydraulic pressure to drive the vehicle body to move. This solves the technical problems of the prior art, where wheels slip or jam, resulting in large errors and low accuracy in locating the location of pipeline corrosion. When the vehicle body moves to the defective location, the electric push rod is activated, and the output end of the electric push rod drives the two connecting rods to move to the left. The connecting rods are hinged to the slide rods, so that the ends of the two slide rods connected to the brake balls extend out of the vehicle body and connect to the inner wall of the pipeline to be inspected, causing the detection device to stop moving. The defective location in the pipeline is locked by the locator, and the vehicle body can conveniently stop at the location of pipeline corrosion, so that the corrosion location can be accurately located by the locator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the small-diameter steel pipe precision detection device based on electromagnetic eddy current technology of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the brake structure in the small-diameter steel pipe precision detection device based on electromagnetic eddy current technology of the present invention.

[0019] In the figure, 1. first probe car, 2. second probe car, 3. car body, 4. first winding, 5. first control board, 6. second winding, 7. second control board, 8. leather cup, 9. battery, 10. electric push rod, 11. inclined sliding sleeve, 12. connecting rod, 13. connecting column, 14. connecting rod, 15. sliding rod, 16. brake ball, 17. opening. DETAILED DESCRIPTION

[0020] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] like Figure 1 and Figure 2 As shown, the small-diameter steel pipe precision detection device based on electromagnetic eddy current technology disclosed by the utility model includes a probe car and a car body 3 hinged to each other by a universal joint. A locator is provided in the probe car for locating the position of the pipeline. The probe car is provided with an electrically connected winding and a control board. The control board is connected to the external user terminal signal, that is, wireless communication. The user terminal is a mobile phone or a remote control. The winding and the control board are electrically connected to a battery 9. The battery 9 is used to power various electronic devices. A leather cup 8 is fixed to the outer wall of the probe car, and a brake mechanism is provided in the car body 3.

[0023] The utility model drives the leather cup 8 through the fluid in the pipeline to further drive the vehicle body 3 to move, and a high-frequency current is passed through the winding, and a stable magnetic field of the same frequency will be generated around the winding. The magnetic flux lines penetrate the steel pipe wall, so that an induced loop current is generated in the steel pipe wall, and the induced loop current then induces an induced secondary magnetic field. The secondary magnetic field acts on the steel pipe wall. When the magnetic flux lines of the secondary magnetic field hit the defects on the steel pipe wall, the frequency and intensity of the magnetic flux lines will change. This change will be transmitted to the control board to determine the position of the defect. In order to have enough time for positioning, when moving to the defective position, the brake mechanism is started to stop the probe vehicle and the vehicle body 3 from moving, thereby locking the defective position in the steel pipe through the locator. The vehicle body 3 can conveniently stop at the corroded position in the steel pipe so that the corrosion position can be accurately located by the locator.

[0024] Example 2

[0025] On the basis of Example 1, in this embodiment, the brake mechanism includes a connecting column 13 fixedly connected to the vehicle body 3, an electric push rod 10 is sleeved on the connecting column 13, and the output end of the electric push rod 10 is hinged with two symmetrically arranged connecting rods 14, and the end of the connecting rod 14 facing away from the output end of the electric push rod 10 is hinged with a slide rod 15; the two sides corresponding to the electric push rod 10 and the connecting rod 14 are symmetrically fixed with connecting rods 12, and the end of the connecting rod 12 facing away from the electric push rod 10 is fixed with an inclined sliding sleeve 11, the slide rod 15 is slidably connected along the inner cavity of the inclined sliding sleeve 11, and the end of the slide rod 15 facing away from the connecting rod 14 is fixed with a brake ball 16; an opening 17 is opened on the vehicle body 3, and the slide rod 15 drives the brake ball 16 to extend out from the opening 17.

[0026] Specifically, the brake ball 16 is a rubber ball. When the vehicle body 3 moves to the defective position of the steel pipe to be inspected, the electric push rod 10 is activated. The output end of the electric push rod 10 drives the two connecting rods 14 to move to the left. The connecting rod 14 is hinged to the slide rod 15, so that the ends of the two slide rods 15 connected to the brake ball 16 extend from the vehicle body 3 through the opening 17 and connect to the inner wall of the pipe to be inspected. The slide rod 15 itself moves along the inside of the inclined sleeve 11. The friction between the brake ball 16 and the inner wall of the steel pipe causes the vehicle body 3 and the probe vehicle to stop moving, thereby locking the defective position in the steel pipe through the locator. The vehicle body 3 can conveniently stop at the position where the steel pipe is corroded, so that the position of the steel pipe corrosion can be accurately located by the locator. Among them, the connecting rod 12 plays the role of supporting the inclined sleeve 11, the purpose of which is to limit the slide rod 15 through the inclined sleeve 11, further allowing the brake ball 16 to accurately extend from the opening 17 to the outside of the vehicle body 3 and abut against the inner wall of the steel pipe. At the same time, the connecting rod 14 is hinged to the slide rod 15, and the connecting rod 14 is hinged to the output end of the electric push rod 10, all of which are for the purpose of cooperating with the inclined sliding sleeve 11. This structure can avoid the phenomenon of the slide rod 15 and the inclined sliding sleeve 11 being stuck after the connecting rod 14 is driven to move when the output end of the electric push rod 10 moves.

[0027] Example 3

[0028] In this embodiment, based on Example 1 or Example 2, the leather cup 8 has a trapezoidal longitudinal cross-section, is sleeved on the outer wall of the probe cart, and is open on one side of the cart body 3. In this embodiment, the leather cup 8 provides a cross-sectional area for receiving force. When the cart body 3 and the probe cart are located in the pipeline, the fluid in the pipeline, generally high-pressure water, pushes the leather cup 8, further driving the probe cart and the cart body 3 to move.

[0029] Example 4

[0030] The following combination Figure 1 and Figure 2 This embodiment is further explained.

[0031] The first probe car 1, the second probe car 2 and the car body 3 are connected in sequence through universal joints. The first probe car 1 is provided with a first winding 4 and a first control board 5, and the first winding 4 and the first control board 5 are electrically connected. The second probe car 2 is provided with a second winding 6 and a second control board 7, and the second winding 6 and the second control board 7 are electrically connected. Leather cups 8 are provided on the outer walls of the first probe car 1 and the second probe car 2. Batteries 9 are provided on the inner walls of the first probe car 1, the second probe car 2 and the car body 3 for powering various electronic devices. The first control board 5 and the second control board 7 communicate wirelessly with the user terminal, which is a mobile phone or a remote control. An electric push rod 10 is provided in the car body 3. An inclined sleeve 11 is respectively provided on the upper and lower sides of the outer wall of the push rod 10, one end of the connecting rod 12 is connected to the outer wall of the inclined sleeve 11, and the other end of the connecting rod 12 is connected to the outer wall of the electric push rod 10, and the electric push rod 10 is connected to the inner wall of the vehicle body 3 through a connecting column 13. The output rod of the electric push rod 10 is hinged to one end of the connecting rod 14, and the other end of the connecting rod 14 is hinged to one end of the sliding rod 15. One end of the sliding rod 15 passes through the inclined sleeve 11 and is slidably connected to the inclined sleeve 11. The other end of the sliding rod 15 is provided on the brake ball 16. Openings 17 are respectively provided at both ends of the outer wall of the vehicle body 3, and the brake ball 16 can pass through the opening 17. Positioners are provided in the first probe vehicle 1 and the second probe vehicle 2 for locating the position of the pipeline.

[0032] The working principle of this utility model is as follows:

[0033] The first probe vehicle 1, the second probe vehicle 2, and the vehicle body 3 are driven by liquid pressure to move within the steel pipe to be inspected. A high-frequency current is passed through the first winding 4 and the second winding 6, generating a stable magnetic field of the same frequency around the windings. The magnetic flux lines penetrate the steel pipe wall, generating an induced loop current in the steel pipe wall. The induced loop current then induces an induced secondary magnetic field. The secondary magnetic field acts on the steel pipe wall. When the magnetic flux lines of the secondary magnetic field hit a defect on the steel pipe wall, the frequency and intensity of the magnetic flux lines will change. This change will be transmitted to the first control board 5 and the second control board 7, thereby determining the location of the defect. To ensure sufficient time for positioning, when moving to the defective position, the electric push rod 10 is activated. The output end of the electric push rod 10 drives the two connecting rods 14 to move left. The connecting rod 14 is hinged to the slide bar 15, so that the ends of the two slide bars 15 connected to the brake balls 16 extend outside the vehicle body 3 and connect to the inner wall of the pipe to be inspected, causing the first probe vehicle 1, the second probe vehicle 2, and the vehicle body 3 to stop moving, thereby locking the position of the defect in the steel pipe through the locator.

Claims

1. Small diameter steel pipe precision detection device based on electromagnetic eddy current technology, characterized by: The invention comprises a probe vehicle and a vehicle body (3) which are hinged to each other. An electrically connected winding and a control panel are provided in the probe vehicle. The control panel is connected to an external user terminal signal. The winding and the control panel are both electrically connected to a battery (9). A leather cup (8) is fixed to the outer wall of the probe vehicle. A brake mechanism is provided in the vehicle body (3).

2. The small-diameter steel pipe precision detection device based on electromagnetic eddy current technology according to claim 1 is characterized in that: The probe vehicle and the vehicle body (3) are hinged via a universal joint.

3. The small-diameter steel pipe precision detection device based on electromagnetic eddy current technology according to claim 1 is characterized in that: A locator is provided in the probe vehicle.

4. The small-diameter steel pipe precision detection device based on electromagnetic eddy current technology according to claim 1 is characterized in that: The brake mechanism comprises a connecting column (13) fixedly connected to the vehicle body (3), an electric push rod (10) is sleeved on the connecting column (13), the output end of the electric push rod (10) is hinged with two symmetrically arranged connecting rods (14), and one end of the connecting rod (14) away from the output end of the electric push rod (10) is hinged with a slide rod (15); the two sides of the electric push rod (10) corresponding to the connecting rod (14) are symmetrically fixed with connecting rods (12), one end of the connecting rod (12) away from the electric push rod (10) is fixed with an inclined sliding sleeve (11), the slide rod (15) is slidably connected along the inner cavity of the inclined sliding sleeve (11), and the end of the slide rod (15) away from the connecting rod (14) is fixed with a brake ball (16); an opening (17) is opened on the vehicle body (3), and the slide rod (15) drives the brake ball (16) to extend out of the opening (17).

5. The small-diameter steel pipe precision detection device based on electromagnetic eddy current technology according to claim 4 is characterized in that: The brake ball (16) is a rubber ball.

6. The small-diameter steel pipe precision detection device based on electromagnetic eddy current technology according to claim 1 or 4, characterized in that: The leather cup (8) has a trapezoidal longitudinal section, is sleeved on the outer wall of the probe vehicle, and is open on one side of the vehicle body (3).

7. The small-diameter steel pipe precision detection device based on electromagnetic eddy current technology according to claim 1 is characterized in that: The user terminal is a mobile phone or a remote control.

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