Corrosion defect detection apparatus and method for petrochemical pipe

Abstract

A corrosion defect detection apparatus for a petrochemical pipe, comprising a mounting plate (1), a battery box (10) being mounted on one side of the mounting plate (1), an extension structure (2) comprising a transmission assembly disposed on one side of the mounting plate (1), rotating frames (201) rotatably connected to the outer side of the transmission assembly, and push arms (202) rotatably connected to the outer side of the transmission assembly and rotatably connected to the rotating frames (201), and a connecting wire (8) connected to a controller (9) being mounted on one side of each electromagnetic ultrasonic thickness measurement probe (7).controller (9) being mounted on one side of each electromagnetic ultrasonic thickness measurement probe (7).

Description

A device and method for detecting corrosion defects in petrochemical pipelines

[0001] Cross-references

[0002] This application incorporates Chinese Patent Application No. 202411783864.5, filed on December 6, 2024, entitled "A Device and Method for Detecting Corrosion Defects in Petrochemical Pipelines", which is incorporated herein by reference in its entirety. Technical Field

[0003] This application relates to the field of pipeline defect detection technology, and in particular to a device and method for detecting corrosion defects in petrochemical pipelines. Background Technology

[0004] Petrochemical pipelines are an indispensable and important component of chemical production, mainly used to transport petroleum, natural gas, chemical raw materials, intermediates, synthetics, and finished products. Because petrochemical raw materials often contain corrosive substances, the inner walls of petrochemical pipelines are easily corroded and damaged during transportation. Therefore, it is necessary to establish petrochemical pipeline corrosion defect detection devices to detect corrosion defects in petrochemical pipelines, promptly identify potential safety hazards such as corrosion, cracks, and peeling, and thus prevent these hazards from developing into serious accidents.

[0005] A search revealed an application with application number 202222222740.2, which discloses a pipeline corrosion detection device, including a detection box, a locator, and a magnetic detector. The locator is installed on the front side of the detection box, and the magnetic detector is installed on the front side of the locator. The device also includes: a base, which is concave in shape, on which the detection box is placed; four track wheels, rotatably mounted on the front and rear ends of the left and right sides of the base; a track, which engages with the outer walls of two track wheels on the same side; and two motors, mounted on the inner wall of the base, located on the left front end and right rear end of the inner wall of the base. This pipeline corrosion detection device allows for disassembly of the detection box and the base, is simple to operate, and flexible in use. Other equipment needed in the pipeline can be installed on the base, and the support mechanism enables stable movement, maximizing the use of the support mechanism, saving resources, and has a wide range of applications, meeting the needs of enterprises.

[0006] The above-mentioned application has at least the following problems: it is inconvenient to adjust the size to adapt to pipes with different inner diameters. Traditional pipe corrosion detection devices adopt a fixed structure, and their size and shape are determined after manufacturing. They cannot be adjusted according to the actual inner diameter of the pipe. This design makes the detection device only applicable to pipes of a specific size, which limits its application range. Summary of the Invention

[0007] The purpose of some embodiments of this application is to provide a device for detecting corrosion defects in petrochemical pipelines.

[0008] The petrochemical pipeline corrosion defect detection device specifically includes a mounting plate, and further includes: a battery box, mounted on one side of the mounting plate, with a controller fixed to one side of the battery box; a control board mounted on the top of one side of the controller; and a data interface mounted on the bottom of one side of the controller; an extension structure, located on the other side of the mounting plate, wherein the extension structure includes a transmission component located on one side of the mounting plate, a rotating frame rotatably connected to the outside of the transmission component, and a push arm rotatably connected to the outside of the transmission component and rotatably connected to the rotating frame; a pressure accumulator structure, located inside the extension structure, used to ensure smooth movement of the device and prevent wobbling and slippage; a moving wheel, rotatably connected to the inside of the rotating frame, with a drive motor connected to the rotating frame mounted on the rotating end of the moving wheel; an auxiliary wheel, rotatably connected to the inside of the rotating frame on the side away from the moving wheel; a fitting structure, located on the outside of the rotating frame; and an electromagnetic ultrasonic thickness measuring probe, mounted on... Inside the fitting structure, a connecting wire connected to the controller is installed on one side of the electromagnetic ultrasonic thickness measuring probe; the transmission assembly includes a connecting plate fixed to one side of the mounting plate, a fixed rod fixed to one side of the connecting plate, a lead screw rotatably connected inside the connecting plate, a limiting plate rotatably connected to the outside of the lead screw and connected to the fixed rod, a differential fixed to one side of the fixed rod and whose rotating end is connected to the lead screw, a servo motor connected to the rotating end of the differential, and a moving frame sliding on the outside of the fixed rod and rotatably connected to the push arm; the fitting structure includes a rotating seat installed on one side of the rotating frame, a connecting frame rotatably connected to both sides of the rotating seat, a fixed frame fixed to the top of one side of the connecting frame, guide wheels rotatably connected to both sides of the top of the fixed frame, an electric telescopic rod fixed inside the fixed frame and whose telescopic end is connected to the electromagnetic ultrasonic thickness measuring probe, a guardrail fixed to one side of the top of the fixed frame, and a through hole opened inside one side of the fixed frame.

[0009] In addition, the rotating frame and the limiting plate are connected by a rotational connection, the connecting plate and the fixed rod are welded together, the limiting plate and the fixed rod are welded together, the outer wall of the lead screw is provided with an external thread, and the inside of the moving frame is provided with an internal thread that cooperates with the external thread. The rotating frame is connected to the moving frame through a push arm, and the push arm is distributed in a ring at equal intervals on the outer side of the moving frame.

[0010] In addition, roller bearings are installed between the limiting plate and the lead screw, and between the connecting plate and the lead screw, respectively, and the lead screw forms a rotating structure with the connecting plate through the roller bearings.

[0011] In addition, the pressure storage structure includes an oil reservoir fixed at the middle section of the push arm, an oil outlet hole opened inside one side of the oil reservoir, a connecting hose connected to one side of the oil outlet hole, a spring seat fixed on the outside of the oil reservoir, a telescopic spring installed on the top of the spring seat, a connecting seat fixed on the top of the telescopic spring and connected to the push arm, a piston rod fixed at the bottom of the connecting seat and sliding inside the oil reservoir, and a sealing piston installed at the bottom of the piston rod and sliding inside the oil reservoir.

[0012] In addition, the oil reservoirs are symmetrically distributed along the vertical center line of the lead screw, and the two sets of symmetrically arranged oil reservoirs are connected by a connecting hose.

[0013] In addition, the connecting frame forms a rotating structure with the rotating base and the rotating frame, and the guide wheels are symmetrically distributed on the vertical center line of the rotating base.

[0014] In addition, the fixing frame and the guardrail are welded together as a single unit, and the guardrail has a V-shaped beveled cross-section when viewed from above.

[0015] The purpose of some embodiments of this application is to provide a method for detecting corrosion defects in petrochemical pipelines, specifically including the following steps: S1: Open the pipeline and empty the contents inside, then place the device into the pipeline, and provide power to the device via a battery box; S2: Extend the extension structure to move the moving wheels and auxiliary wheels, so that the four sets of moving wheels and auxiliary wheels contact the inner wall of the pipeline, while the contact structure drives the electromagnetic ultrasonic thickness gauge probe to move towards the inner wall of the pipeline; S3: Start the drive motor to drive the moving wheels to rotate, moving the device inside the pipeline, while the electromagnetic ultrasonic thickness gauge probe inspects the inner wall of the pipeline. The system performs the following steps: S4: When moving to the pipe connection, the length of the push arm is adjusted by the telescopic deformation of the pressure accumulator structure to dampen the movement of the device. At the same time, the pressure accumulator structure uses elasticity to keep the moving wheel and auxiliary wheel in close contact with the inner wall of the pipe, increasing the friction between the moving wheel and the inner wall of the pipe. S5: After the test is completed, the drive motor is started to rotate in the opposite direction, causing the moving wheel to drive the device back along the original path and leave the inside of the pipe. The data stored in the controller can be viewed and read through the control board and data interface. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 is a schematic diagram of one of the structures of a petrochemical pipeline corrosion defect detection device in an embodiment of this application;

[0018] Figure 2 is a second structural schematic diagram of a petrochemical pipeline corrosion defect detection device according to an embodiment of this application;

[0019] Figure 3 is a schematic diagram of the controller structure of a petrochemical pipeline corrosion defect detection device in an embodiment of this application.

[0020] Figure 4 is a three-dimensional structural diagram of the extended structure of a petrochemical pipeline corrosion defect detection device according to an embodiment of this application.

[0021] Figure 5 is a schematic diagram of the three-dimensional cross-sectional structure of an extended structure of a petrochemical pipeline corrosion defect detection device according to an embodiment of this application.

[0022] Figure 6 is a three-dimensional cross-sectional structural diagram of the transmission component of a petrochemical pipeline corrosion defect detection device according to an embodiment of this application.

[0023] Figure 7 is a three-dimensional structural diagram of the rotating frame of a petrochemical pipeline corrosion defect detection device according to an embodiment of this application.

[0024] Figure 8 is a three-dimensional cross-sectional structural diagram of the fitting structure of a petrochemical pipeline corrosion defect detection device according to an embodiment of this application.

[0025] Figure 9 is a three-dimensional cross-sectional schematic diagram of the pressure storage structure of a petrochemical pipeline corrosion defect detection device according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Mounting plate; 2. Extension structure; 201. Rotating frame; 202. Push arm; 203. Servo motor; 204. Differential; 205, Fixed rod; 206, Connecting plate; 207, Roller bearing; 208, Lead screw; 209, Moving frame; 210, Limiting plate; 3, Auxiliary wheel; 4, Drive motor; 5, Moving wheel; 6, Fitting structure; 601, Connecting frame; 602, Fixed frame; 603, Guide wheel; 604, Guardrail; 605, Through hole; 606, Electric telescopic rod; 607, Rotating seat; 7, Electromagnetic ultrasonic thickness measuring probe; 8, Connecting wire; 9, Controller; 10, Battery box; 11, Data interface; 12, Control board; 13, Accumulation structure; 1301, Connecting hose; 1302, Oil reservoir; 1303, Spring seat; 1304, Sealing piston; 1305, Telescopic spring; 1306, Connecting seat; 1307, Piston rod; 1308, Oil outlet. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, some embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0028] As shown in Figures 1 to 9, the first embodiment of this application relates to a corrosion defect detection device for petrochemical pipelines.

[0029] The petrochemical pipeline corrosion defect detection device includes a mounting plate 1, and further includes: a battery box 10, mounted on one side of the mounting plate 1, with a controller 9 fixed to one side of the battery box 10; a control plate 12 mounted on the top of one side of the controller 9; and a data interface 11 mounted on the bottom of one side of the controller 9; and an extension structure 2, located on the other side of the mounting plate 1. The extension structure 2 includes a transmission assembly located on one side of the mounting plate 1, a rotating frame 201 rotatably connected to the outside of the transmission assembly, and a pusher rotatably connected to the outside of the transmission assembly and rotatably connected to the rotating frame 201. Arm 202; accumulator structure 13, located inside the extension structure 2, used to ensure smooth movement of the device and prevent wobbling and slippage; moving wheel 5, rotatably connected inside the rotating frame 201, with a drive motor 4 connected to the rotating frame 201 mounted on the rotating end of the moving wheel 5; auxiliary wheel 3, rotatably connected inside the rotating frame 201 on the side away from the moving wheel 5; fitting structure 6, located on the outside of the rotating frame 201; electromagnetic ultrasonic thickness measuring probe 7, installed inside the fitting structure 6, with a connecting wire 8 connected to the controller 9 mounted on one side of the electromagnetic ultrasonic thickness measuring probe 7.

[0030] The working principle of the above technical solution is as follows: The pipeline is opened and any existing material inside is removed. The device is then inserted into the pipeline. The battery box 10 provides power to the device, activating its operation. The extension structure 2 is operated to extend, pushing the moving wheels 5 and auxiliary wheels 3 towards the inner wall of the pipeline. This ensures that the four sets of moving wheels 5 and auxiliary wheels 3 are completely in contact with the inner wall. Simultaneously, the contact structure 6 drives the electromagnetic ultrasonic thickness gauge probe 7 assembly towards the inner wall of the pipeline for comprehensive inspection. The drive motor 4 is then started to rotate the moving wheels 5, thus allowing the entire device to move smoothly within the pipeline. During this process, the electromagnetic ultrasonic thickness gauge probe 7 is responsible for detecting the condition of the inner wall of the pipeline and transmitting the collected data through a connection... The data is transmitted in real time from the wire 8 to the controller 9. After receiving the data, the controller 9 automatically analyzes and stores it securely for easy access by subsequent staff. When the device moves to the pipe connection, the length of the push arm 202 is adjusted by the telescopic deformation of the pressure storage structure 13 to dampen the movement of the device. At the same time, the pressure storage structure 13 uses its elasticity to keep the moving wheel 5 and the auxiliary wheel 3 in close contact with the inner wall of the pipe. After the detection task is completed, the drive motor 4 is started in reverse so that the moving wheel 5 drives the device back to the pipe inlet along the original path. After the device has completely exited the pipe, the detailed detection data stored in the controller 9 can be easily accessed through the control board 12 and the data interface 11 for further analysis and evaluation.

[0031] Compared with the prior art, this embodiment has the following advantages: 1. The petrochemical pipeline corrosion defect detection device uses a servo motor to drive the lead screw to rotate, causing the moving frame to rotate. Simultaneously, the auxiliary wheel and the moving wheel are in close contact with the inside of the pipeline, achieving a size adjustment function. This allows the device to easily adapt to pipelines of different inner diameters, facilitating various complex working conditions and enhancing the versatility and flexibility of the detection device. It solves the problem of inconvenient size adjustment in existing pipeline corrosion detection devices. 2. The petrochemical pipeline corrosion defect detection device uses the rotating frame to drive the connecting frame to move, adjusting the position of the electromagnetic ultrasonic thickness gauge probe. This achieves position adjustment, allowing the device to move the position of the electromagnetic ultrasonic thickness gauge probe during size adjustment, ensuring more accurate detection of pipeline corrosion. 3. The petrochemical pipeline corrosion... The defect detection device extends the moving wheels and auxiliary wheels through an extension structure, causing the connecting seat to compress hydraulic oil and the telescopic spring to store pressure. Adjusting the pressure of the rotating frame on the moving wheels and auxiliary wheels prevents slippage during movement. Simultaneously, the telescopic spring and the oil inside the storage tank reduce the impact of vibration on the device, achieving a pressure storage and buffering function. This ensures that the moving wheels remain tightly against the inner wall of the pipeline during movement, guaranteeing normal device movement and reducing vibrations generated during movement. 4. This petrochemical pipeline corrosion defect detection device uses an electric telescopic rod to adjust the lift-off gap of the electromagnetic ultrasonic thickness gauge probe. This gap adjustment allows for adjustments to the lift-off gap height based on factors such as the roughness of the pipeline inner wall and coating thickness, enabling ultrasonic waves to propagate and reflect more effectively within the material, ensuring the accuracy and reliability of the measurement results.

[0032] As shown in Figures 4, 5, 6 and 7, in the second embodiment of this application, the transmission assembly includes a connecting plate 206 fixed to one side of the mounting plate 1, a fixing rod 205 fixed to one side of the connecting plate 206, a lead screw 208 rotatably connected inside the connecting plate 206, a limiting plate 210 rotatably connected to the outside of the lead screw 208 and connected to the fixing rod 205, a differential 204 fixed to one side of the fixing rod 205 and whose rotating end is connected to the lead screw 208, a servo motor 203 connected to the rotating end of the differential 204, and a moving frame 209 sliding on the outside of the fixing rod 205 and rotatably connected to the push arm 202.

[0033] The working principle and beneficial effects of the above technical solution are as follows: When adjusting the size of the device, the servo motor 203 is started, causing the differential 204 to drive the lead screw 208 to rotate. At the same time, since the moving frame 209 has a thread inside that meshes with the lead screw 208, the lead screw 208 moves on the outside of the moving frame 209 using the thread during rotation. Simultaneously, the moving frame 209 slides on the outside of the fixed rod 205, limiting the direction of movement of the moving frame 209 and preventing the moving frame 209 from rotating with the lead screw 208. The moving frame 209 pushes the rotating frame 201 to flip through the push arm 202, causing the four sets of rotating frames 201 to unfold outward and drive the auxiliary wheel 3 and the moving wheel 5 to move towards the inner wall of the pipe, so that the auxiliary wheel 3 and the moving wheel 5 are tightly attached to the inside of the pipe, making the device less prone to shaking during movement. The range of movement of the moving frame 209 is limited by the limiting plate 210.

[0034] In addition, in this embodiment, the rotating frame 201 and the limiting plate 210 are rotatably connected, the connecting plate 206 and the fixing rod 205 are welded together, the limiting plate 210 and the fixing rod 205 are welded together, the outer wall of the lead screw 208 is provided with an external thread, and the interior of the moving frame 209 is provided with an internal thread that cooperates with the external thread. The rotating frame 201 is connected to the moving frame 209 through the push arm 202, and the push arm 202 is distributed in a ring at equal intervals on the outer side of the moving frame 209.

[0035] The working principle and beneficial effects of the above technical solution are as follows: the rotating frame 201 rotates around the limiting plate 210 so that the push arm 202 can push the rotating frame 201 to flip. The connecting plate 206 and the limiting plate 210 are connected and fixed by the fixing rod 205 so as to support the lead screw 208. The engagement of the threads allows the moving frame 209 to convert the rotational motion into linear motion, thereby moving on the surface of the lead screw 208. Multiple sets of rotating frames 201 and push arms 202 are used to support the device so that the moving wheel 5 and the auxiliary wheel 3 are tightly attached to the inner wall of the pipe.

[0036] In addition, in this embodiment, roller bearings 207 are respectively installed between the limiting plate 210 and the lead screw 208, and between the connecting plate 206 and the lead screw 208, and the lead screw 208 forms a rotating structure with the connecting plate 206 through the roller bearings 207.

[0037] The working principle and beneficial effects of the above technical solution are as follows: roller bearings 207 are respectively installed between the limiting plate 210 and the lead screw 208, and between the connecting plate 206 and the lead screw 208. The lead screw 208 forms a rotating structure with the connecting plate 206 through the roller bearings 207. The friction between the lead screw 208 and the connecting plate 206 and the limiting plate 210 is reduced by the roller bearings 207, so that the lead screw 208 rotates smoothly.

[0038] As shown in Figure 9, in the third embodiment of this application, the pressure accumulator structure 13 includes an oil reservoir 1302 fixed at the middle section of the push arm 202, an oil outlet 1308 opened inside one side of the oil reservoir 1302, a connecting hose 1301 connected to one side of the oil outlet 1308, a spring seat 1303 fixed to the outside of the oil reservoir 1302, a telescopic spring 1305 installed at the top of the spring seat 1303, a connecting seat 1306 fixed at the top of the telescopic spring 1305 and connected to the push arm 202, a piston rod 1307 fixed at the bottom of the connecting seat 1306 and sliding inside the oil reservoir 1302, and a sealing piston 1304 installed at the bottom of the piston rod 1307 and sliding inside the oil reservoir 1302.

[0039] The working principle and beneficial effects of the above technical solution are as follows: After the extension structure 2 unfolds and pushes the moving wheel 5 and the auxiliary wheel 3 into contact with the inner wall of the pipe, the servo motor 203 continues to rotate, causing the lead screw 208 to drive the push arm 202 and the rotating frame 201 to move, increasing the pressure of the moving wheel 5 and the auxiliary wheel 3 on the inner wall of the pipe. At the same time, the connecting seat 1306 pushes the piston rod 1307 and the sealing piston 1304 to move, squeezing the hydraulic oil inside the oil reservoir 1302 and the telescopic spring 1305 on the outside of the oil reservoir 1302, shortening the push arm 202. Adjust the length of the rotating frame 201 to apply pressure to the moving wheel 5 and the auxiliary wheel 3, so that the pressure of the moving wheel 5 and the auxiliary wheel 3 on the inner wall of the pipe is within a suitable range, thereby increasing the friction between the moving wheel 5 and the inner wall of the pipe and preventing the moving wheel 5 from slipping due to the oil on the inner wall of the pipe. When it moves to the pipe connection, the moving wheel 5 passes through the rotating frame 201 and the push arm 202 to press the connecting seat 1306, so that the connecting seat 1306 presses the telescopic spring 1305 and the oil inside the oil storage cylinder 1302, thereby reducing the impact of vibration on the device.

[0040] In addition, in this embodiment, the oil storage cylinders 1302 are symmetrically distributed on the vertical center line of the lead screw 208, and the two sets of symmetrically arranged oil storage cylinders 1302 are connected by a connecting hose 1301.

[0041] The working principle and beneficial effects of the above technical solution are as follows: multiple oil storage tanks 1302 are connected by connecting hose 1301 to share and absorb the vibration during the movement process, and at the same time help to reduce the overall instability of the device caused by excessive unilateral or local vibration.

[0042] As shown in Figure 8, in the fourth embodiment of this application, the fitting structure 6 includes a rotating seat 607 installed on one side of the rotating frame 201, a connecting frame 601 rotatably connected to both sides of the rotating seat 607, a fixing frame 602 fixed to the top of one side of the connecting frame 601, guide wheels 603 rotatably connected to both sides of the top of the fixing frame 602, an electric telescopic rod 606 fixed inside the fixing frame 602 and whose telescopic end is connected to the electromagnetic ultrasonic thickness measuring probe 7, a protective railing 604 fixed to one side of the top of the fixing frame 602, and a through hole 605 opened inside one side of the fixing frame 602.

[0043] The working principle and beneficial effects of the above technical solution are as follows: During the extension of the rotating frame 201, the two adjacent sets of rotating frames 201 are driven by the rotating seat 607 to move the connecting frame 601, so that the connecting frame 601 moves towards the inner wall of the pipe, shortening the gap between the electromagnetic ultrasonic thickness measuring probe 7 and the pipe. At the same time, the guide wheel 603 contacts the pipe and supports one end of the connecting frame 601. The lifting gap of the electromagnetic ultrasonic thickness measuring probe 7 is adjusted by the extension and contraction of the electric telescopic rod 606 to ensure the detection accuracy of the electromagnetic ultrasonic thickness measuring probe 7. Meanwhile, the guardrail 604 cleans the path of the electromagnetic ultrasonic thickness measuring probe 7 to prevent objects from scratching the surface of the electromagnetic ultrasonic thickness measuring probe 7.

[0044] In addition, in this embodiment, the connecting frame 601 forms a rotating structure with the rotating frame 201 through the rotating seat 607, and the guide wheels 603 are symmetrically distributed on the vertical center line of the rotating seat 607.

[0045] The working principle and beneficial effects of the above technical solution are as follows: by rotating the rotating seat 607 between the connecting frame 601 and the rotating frame 201, the connecting frame 601 is kept parallel to the inner wall of the pipe during the movement.

[0046] In addition, in this embodiment, the fixing frame 602 and the guardrail 604 are welded together as a single unit, and the top view cross-section of the guardrail 604 has a "V"-shaped inclined structure. This "V"-shaped structure allows the guardrail 604 to easily push away foreign objects during movement.

[0047] In addition, when using this petrochemical pipeline corrosion defect detection device: open the pipeline and remove any substances inside. Insert the device into the pipeline, and use the battery box 10 to provide power to activate the device. Operate the extension structure 2 to extend the device, pushing the moving wheels 5 and auxiliary wheels 3 towards the inner wall of the pipeline. Ensure that all four sets of moving wheels 5 and auxiliary wheels 3 are fully in contact with the inner wall. Simultaneously, the contact structure 6 moves the electromagnetic ultrasonic thickness gauge probe 7 assembly towards the inner wall of the pipeline for comprehensive inspection. Start the drive motor 4 to rotate the moving wheels 5, thereby smoothly moving the entire device within the pipeline. During this process, the electromagnetic ultrasonic thickness gauge probe 7 is responsible for detecting the condition of the inner wall of the pipeline and transmitting the collected data to the controller 9 in real time via the connecting wire 8. After receiving the data, the controller 9 automatically analyzes and securely stores it for easy access by subsequent staff. When moving to the pipe connection, the extension and contraction of the pressure accumulator 13 adjusts the length of the push arm 202 to dampen the movement of the device. Simultaneously, the pressure accumulator 13 uses its elasticity to keep the moving wheel 5 and auxiliary wheel 3 firmly against the inner wall of the pipe. After completing the detection task, the drive motor 4 is started in reverse, causing the moving wheel 5 to drive the device back along the original path to the pipe inlet. Once the device has completely exited the pipe, the detailed detection data stored internally by the controller 9 can be easily accessed via the control board 12 and data interface 11 for further analysis and evaluation. When adjusting the device's dimensions, the servo motor 203 is started, causing the differential 204 to drive the lead screw 20. 8. During rotation, the movable frame 209 has internal threads that mesh with the lead screw 208. As the lead screw 208 rotates, the movable frame 209 moves outside the lead screw 208 using these threads. Simultaneously, the movable frame 209 slides outside the fixed rod 205, restricting the direction of movement and preventing it from rotating with the lead screw 208. The movable frame 209, via the push arm 202, pushes the rotating frame 201 to rotate, causing the four sets of rotating frames 201 to unfold outwards and move the auxiliary wheels 3 and movable wheels 5 towards the inner wall of the pipe. This ensures the auxiliary wheels 3 and movable wheels 5 are tightly pressed against the inside of the pipe, preventing the device from shaking during movement. The roller bearing 207 lowers the lead screw 208 relative to the connecting plate 206 and the limiting plate 210. The friction between them makes the lead screw 208 rotate smoothly, and the movement range of the moving frame 209 is limited by the limiting plate 210. During the extension of the rotating frame 201, the two adjacent sets of rotating frames 201 are driven by the rotating seat 607 to move the connecting frame 601, so that the connecting frame 601 moves towards the inner wall of the pipe, shortening the gap between the electromagnetic ultrasonic thickness measuring probe 7 and the pipe. At the same time, the guide wheel 603 contacts the pipe and supports one end of the connecting frame 601. The lifting gap of the electromagnetic ultrasonic thickness measuring probe 7 is adjusted by the extension and contraction of the electric telescopic rod 606 to ensure the detection accuracy of the electromagnetic ultrasonic thickness measuring probe 7. At the same time, the guardrail 604 cleans the path of the electromagnetic ultrasonic thickness measuring probe 7 to prevent objects from scratching the surface of the electromagnetic ultrasonic thickness measuring probe 7.After the extension structure 2 unfolds and pushes the moving wheel 5 and auxiliary wheel 3 into contact with the inner wall of the pipe, the servo motor 203 continues to rotate, causing the lead screw 208 to drive the push arm 202 and the rotating frame 201 to move, increasing the pressure of the moving wheel 5 and auxiliary wheel 3 on the inner wall of the pipe. At the same time, the connecting seat 1306 pushes the piston rod 1307 and the sealing piston 1304 to move, squeezing the hydraulic oil inside the oil reservoir 1302 and the telescopic spring 1305 on the outside of the oil reservoir 1302 to store pressure, shortening the length of the push arm 202, and adjusting the pressure of the rotating frame 201 on the moving wheel 5 and auxiliary wheel 3, so that the pressure of the moving wheel 5 and auxiliary wheel 3 on the inner wall of the pipe is within a suitable range. At the same time, the elasticity of the telescopic spring 1305 is utilized. The force and hydraulic oil pressure push the connecting seat 1306 to move in the opposite direction, increasing the friction between the moving wheel 5 and the inner wall of the pipe, preventing the moving wheel 5 from slipping due to the oil on the inner wall of the pipe. When it moves to the pipe connection point, the moving wheel 5 is pressed against the connecting seat 1306 by the rotating frame 201 and the push arm 202, causing the connecting seat 1306 to compress the telescopic spring 1305 and the oil inside the oil reservoir 1302, thus buffering and absorbing the vibration impact and reducing the impact of vibration on the device. Multiple sets of oil reservoirs 1302 are connected by the connecting hose 1301 to share and absorb the vibration during the movement, and at the same time, it helps to reduce the overall instability of the device caused by excessive unilateral or local vibration.

[0048] The fifth embodiment of this application also provides a method for detecting corrosion defects in petrochemical pipelines, including the following steps: S1: Open the pipeline and empty the contents inside; then place the device into the pipeline and provide power to the device via a battery box; S2: Extend the extension structure to move the moving wheels and auxiliary wheels, so that the four sets of moving wheels and auxiliary wheels contact the inner wall of the pipeline, while the contact structure moves the electromagnetic ultrasonic thickness gauge probe towards the inner wall of the pipeline; S3: Start the drive motor to rotate the moving wheels, moving the device inside the pipeline, while the electromagnetic ultrasonic thickness gauge probe inspects the inner wall of the pipeline. The detection data is transmitted to the controller via connecting wires, allowing the controller to analyze and store the pipeline data for easy viewing by staff; S4: When moving to the pipeline connection, the length of the push arm is adjusted by the telescopic deformation of the pressure accumulator structure to dampen the movement of the device. At the same time, the pressure accumulator structure uses elasticity to keep the moving wheel and auxiliary wheel in close contact with the inner wall of the pipeline, increasing the friction between the moving wheel and the inner wall of the pipeline; S5: After the detection is completed, the drive motor is started to rotate in the opposite direction, causing the moving wheel to drive the device backward along the original path and leave the interior of the pipeline. The data stored in the controller can be viewed and read through the control board and data interface.

[0049] Those skilled in the art will understand that the above embodiments are specific embodiments for implementing this application, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of this application.

Claims

1. A corrosion defect detection device for petrochemical pipelines, comprising a mounting plate (1), wherein, It also includes: a battery box (10), installed on one side of the mounting plate (1), and a controller (9) is fixed on one side of the battery box (10), a control board (12) is installed on the top of one side of the controller (9), and a data interface (11) is installed on the bottom of one side of the controller (9); an extension structure (2), set on the other side of the mounting plate (1), wherein the extension structure (2) includes a transmission assembly set on one side of the mounting plate (1), a rotating frame (201) rotatably connected to the outside of the transmission assembly, and a push arm (202) rotatably connected to the outside of the transmission assembly and rotatably connected to the rotating frame (201); a accumulator structure ( 13), set inside the extension structure (2), used to make the device move smoothly and not easily shake or slip; moving wheel (5), rotatably connected inside the rotating frame (201), and the rotating end of the moving wheel (5) is equipped with a drive motor (4) connected to the rotating frame (201); auxiliary wheel (3), rotatably connected inside the rotating frame (201) on the side away from the moving wheel (5); fitting structure (6), set outside the rotating frame (201); electromagnetic ultrasonic thickness probe (7), installed inside the fitting structure (6), and a connecting guide connected to the controller (9) is installed on one side of the electromagnetic ultrasonic thickness probe (7). Line (8); The transmission assembly includes a connecting plate (206) fixed to one side of the mounting plate (1), a fixing rod (205) fixed to one side of the connecting plate (206), a lead screw (208) rotatably connected inside the connecting plate (206), a limiting plate (210) rotatably connected to the outside of the lead screw (208) and connected to the fixing rod (205), a differential (204) fixed to one side of the fixing rod (205) and whose rotating end is connected to the lead screw (208), a servo motor (203) connected to the rotating end of the differential (204), and a moving frame sliding on the outside of the fixing rod (205) and rotatably connected to the push arm (202). (209); The fitting structure (6) includes a rotating seat (607) installed on one side of the rotating frame (201), a connecting frame (601) rotatably connected to both sides of the rotating seat (607), a fixed frame (602) fixed to the top of one side of the connecting frame (601), guide wheels (603) rotatably connected to both sides of the top of the fixed frame (602), an electric telescopic rod (606) fixed inside the fixed frame (602) and whose telescopic end is connected to the electromagnetic ultrasonic thickness measuring probe (7), a guardrail (604) fixed to one side of the top of the fixed frame (602), and a through hole (605) opened inside one side of the fixed frame (602).

2. The petrochemical pipeline corrosion defect detection device as described in claim 1, wherein, The rotating frame (201) and the limiting plate (210) are connected by a rotational connection. The connecting plate (206) and the fixed rod (205) are welded together. The limiting plate (210) and the fixed rod (205) are welded together. The outer wall of the lead screw (208) is provided with an external thread, and the inside of the moving frame (209) is provided with an internal thread that cooperates with the external thread. The rotating frame (201) is connected to the moving frame (209) through a push arm (202). The push arm (202) is distributed in a ring at equal intervals on the outside of the moving frame (209).

3. The petrochemical pipeline corrosion defect detection device as described in claim 1, wherein, Roller bearings (207) are respectively installed between the limiting plate (210) and the lead screw (208), and between the connecting plate (206) and the lead screw (208). The lead screw (208) forms a rotating structure with the connecting plate (206) through the roller bearings (207).

4. The petrochemical pipeline corrosion defect detection device as described in claim 1, wherein, The pressure storage structure (13) includes an oil reservoir (1302) fixed at the middle section of the push arm (202), an oil outlet (1308) opened inside one side of the oil reservoir (1302), a connecting hose (1301) connected to one side of the oil outlet (1308), a spring seat (1303) fixed on the outside of the oil reservoir (1302), a telescopic spring (1305) installed on the top of the spring seat (1303), a connecting seat (1306) fixed on the top of the telescopic spring (1305) and connected to the push arm (202), a piston rod (1307) fixed on the bottom of the connecting seat (1306) and sliding inside the oil reservoir (1302), and a sealing piston (1304) installed on the bottom of the piston rod (1307) and sliding inside the oil reservoir (1302).

5. The petrochemical pipeline corrosion defect detection device as described in claim 4, wherein, The oil reservoirs (1302) are symmetrically distributed on the vertical center line of the lead screw (208), and the two sets of symmetrically arranged oil reservoirs (1302) are connected by a connecting hose (1301).

6. The petrochemical pipeline corrosion defect detection device as described in claim 1, wherein, The connecting frame (601) forms a rotating structure with the rotating frame (201) through the rotating seat (607), and the guide wheels (603) are symmetrically distributed on the vertical center line of the rotating seat (607).

7. The petrochemical pipeline corrosion defect detection device as described in claim 1, wherein, The fixing frame (602) and the guardrail (604) are welded together as an integrated structure, and the top view cross section of the guardrail (604) is a "V" shaped inclined structure.

8. A method for detecting corrosion defects in petrochemical pipelines using a petrochemical pipeline corrosion defect detection device as described in any one of claims 1-7, wherein, Includes the following steps: S1: Open the pipe and empty the contents of the pipe. Then place the device into the pipe and provide power to the device through the battery box (10). S2: Use the extension structure (2) to extend and push the moving wheel (5) and auxiliary wheel (3) to move, so that the four sets of moving wheels (5) and auxiliary wheels (3) contact the inner wall of the pipe, while the fitting structure (6) drives the electromagnetic ultrasonic thickness probe (7) to move towards the inner wall of the pipe. S3: Start the drive motor (4) to drive the moving wheel (5) to rotate, and move the device inside the pipe. At the same time, the electromagnetic ultrasonic thickness probe (7) detects the inner wall of the pipe and transmits the detection data to the controller (9) through the connecting wire (8), so that the controller (9) can analyze and store the pipe data for the staff to view. S4: When moving to the pipe connection, the length of the push arm (202) is adjusted by the expansion and contraction deformation of the pressure storage structure (13) to reduce the vibration of the device. At the same time, the pressure storage structure (13) uses elasticity to keep the moving wheel (5) and the auxiliary wheel (3) in close contact with the inner wall of the pipe, increasing the friction between the moving wheel (5) and the inner wall of the pipe. S5: After the test is completed, start the drive motor (4) to rotate in the opposite direction, so that the moving wheel (5) drives the device to return to the original path and leave the inside of the pipe. The data stored in the controller (9) can be viewed and read through the control board (12) and the data interface (11).

Images