Multi-shaft seamless steel pipe flaw detection line

Abstract

The invention discloses a multi-axis seamless steel tube flaw detection line, relates to the technical field of seamless steel tube detection, and aims to solve the problem of high omission ratio. The multi-axis seamless steel tube flaw detection line comprises a detection line base station and a detection mechanism, and the detection mechanism comprises a magnetic leakage flaw detector, an eddy current detector and an ultrasonic detector; the magnetic leakage flaw detector, the eddy current detector and the ultrasonic detector are sequentially installed above the detection line base station, power rollers are symmetrically installed on the two sides of the detection line base station, and pressure rollers are installed on the sides, close to the detection mechanism, above the power rollers. According to the scheme, flaw detection, surface cleaning and positioning functions are integrated on the same detection line, the steel pipe transfer frequency is reduced, the detection efficiency is improved, the device is suitable for continuous production workshops, steel pipes can pass through the detection mechanism back and forth by arranging the power rollers on the two sides, end clamping is not needed, and it is ensured that seamless steel pipes are completely detected; and the clamped end part does not need to be cut off after detection, so that the efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of seamless steel pipe inspection, specifically a multi-axis flaw detection line for seamless steel pipes. Background Technology

[0002] Seamless steel pipes are made by piercing a single round steel bar, resulting in a steel pipe with no weld seams on its surface. They are mainly used as drilling pipes for oil and geological processes, cracking pipes for petrochemicals, boiler tubes, bearing tubes, and high-precision structural steel pipes for automobiles, tractors, and aviation. Flaw detection is a key technology for ensuring the quality of seamless steel pipes, primarily employing ultrasonic testing for defect detection.

[0003] Existing seamless steel pipe flaw detection technologies still have some shortcomings. For example, traditional clamping and conveying methods prevent the pipe ends from being inspected, requiring subsequent end removal and resulting in material waste. Additionally, impurities such as oil and oxide layers can obscure flaws and affect sound wave propagation, reducing detection accuracy. Summary of the Invention

[0004] To address the aforementioned problems, specifically those raised in the background section, this invention proposes a multi-axis seamless steel pipe flaw detection line, comprising a detection line base and a detection mechanism. The detection mechanism includes a magnetic flux leakage flaw detector, an eddy current detector, and an ultrasonic detector. The magnetic flux leakage flaw detector, eddy current detector, and ultrasonic detector are sequentially installed above the detection line base. Power rollers are symmetrically installed on both sides of the detection line base, and a pressure roller is installed above the power rollers on the side closest to the detection mechanism.

[0005] One of the power rollers is equipped with a steel pipe surface cleaning mechanism on the side away from the detection line base. The steel pipe surface cleaning mechanism includes a cleaning box, the interior of which is divided into two interconnected cavities by a partition. A double roller conveyor is installed at the connection between the two cavities. A solvent sprayer and a wire drawing brush drive base are respectively installed in the two cavities. The solvent sprayer is installed above the cavity, and the wire drawing brush drive base is installed in the cavity via a slide rail. The wire drawing brush drive base is slidably installed in the slide rail. At least one wire drawing brush is installed above the wire drawing brush drive base. A drive motor for driving the wire drawing brush is installed on the wire drawing brush drive base. A hydraulic cylinder for pushing the wire drawing brush drive base is installed on the slide rail, and the extension end of the hydraulic cylinder is connected to the wire drawing brush drive base. Sealing mechanisms are installed at both the inlet and outlet of the cleaning box.

[0006] A further feature of the present invention is that the double roller conveying mechanism is a double inclined roller conveying mechanism.

[0007] A further feature of the present invention is that a limit switch for limiting the distance between the wire drawing brush and the workpiece is installed on the wire drawing brush drive base.

[0008] A further configuration of the present invention is as follows: the sealing mechanism includes a sealing ring mounting seat and a lip sealing ring, the sealing ring mounting seat is respectively installed on the inlet and outlet of the cleaning box, and the lip sealing ring is installed on the inner wall of the sealing ring mounting seat.

[0009] A further configuration of the present invention is as follows: the pressure roller includes an n-shaped mounting frame, a telescopic cylinder, a parallelogram-shaped linkage mechanism, a roller, and a connecting block. The mounting frame is mounted above the power roller on the side near the detection line base. Two adjacent shafts of the linkage mechanism are mounted on the mounting frame. The connecting block and the roller are rotatably mounted on two shafts of the linkage mechanism that are not mounted on the mounting frame. The telescopic cylinder is rotatably mounted on the mounting frame, and the telescopic rod of the telescopic cylinder is connected to the connecting block.

[0010] The beneficial technical effects of this invention are as follows: This solution integrates flaw detection, surface cleaning, and positioning functions on the same inspection line, reducing the number of steel pipe transfers and improving inspection efficiency. It is suitable for continuous production workshops. By setting up power rollers on both sides, the steel pipe passes back and forth through the inspection mechanism without clamping the end, ensuring that the seamless steel pipe is fully inspected. Furthermore, there is no need to cut off the clamped end after inspection, increasing efficiency. Through the cooperation of pressure rollers and power rollers, it is ensured that each seamless steel pipe remains centered as it passes through the inspection mechanism, avoiding the failure to detect hidden cracks due to different detection depths at various points. At the same time, impurities on the surface of the seamless steel pipe are cleaned before inspection to prevent impurities from obscuring cracks and increasing the sound wave attenuation rate, which would lead to a higher false detection rate. In addition, a sealing mechanism is used at the inlet and outlet of the cleaning box to prevent impurities from splashing or solvents from evaporating and overflowing, improving the working environment and reducing the risk of occupational diseases. Attached Figure Description

[0011] Figure 1 A schematic diagram of the overall structure of this solution is shown.

[0012] Figure 2 A top view of the structure of this design is shown.

[0013] Figure 3 A schematic diagram of the side structure of the pressure roller is shown.

[0014] Figure 4 A schematic diagram of the main structure of the pressure roller is shown.

[0015] Figure 5 A top-down view of the cleaning chamber is shown.

[0016] Figure 6 A front view diagram of the cleaning chamber's interior is shown.

[0017] Attached figures: 1. Detection line base; 2. Ultrasonic detector; 3. Eddy current detector; 4. Magnetic flux leakage flaw detector; 5. Pressure roller; 501. Mounting bracket; 502. Telescopic cylinder; 503. Linkage mechanism; 504. Roller; 505. Connecting block; 6. Power roller; 7. Cleaning box; 8. Sealing ring mounting base; 9. Solvent sprayer; 10. Double roller conveyor mechanism; 11. Wire drawing brush drive base; 12. Slide rail; 13. Wire drawing brush; 14. Lip seal ring. Detailed Implementation

[0018] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0019] This invention proposes a multi-axis seamless steel pipe flaw detection line, which mainly realizes the flaw detection function through the detection mechanism. The detection mechanism consists of a magnetic flux leakage flaw detector 4, an eddy current detector 3, and an ultrasonic detector 2 integrated on the detection line base 1. The seamless steel pipe passes through the three detectors in sequence for flaw detection, and the flaw detection results can be viewed on the display screen in the control room.

[0020] The accuracy of flaw detection results is affected by a variety of factors. For example, impurities such as dust, oil, or oxide layers on the surface of seamless steel pipes can obscure cracks and affect detection accuracy. At the same time, impurities can also affect the propagation of sound waves. Positional deviation of the seamless steel pipe can also cause it to fail to detect hidden cracks due to different detection depths at different locations. Furthermore, traditional seamless steel pipe flaw detection lines require clamping the end of the seamless steel pipe, passing it through the detection mechanism, and then retracting to complete the detection process. There is a possibility that the clamped end cannot be detected, making it impossible to achieve a 100% surface detection rate. The end needs to be cut off with a circular saw after detection. Therefore, in continuous production workshops, it is necessary to eliminate the above-mentioned hidden dangers to ensure the efficiency and accuracy of the seamless steel pipe flaw detection process.

[0021] This scheme symmetrically arranges power rollers 6 on both sides of the inspection line base 1, allowing seamless steel pipes to pass completely through the inspection mechanism and retract via the power rollers 6 on both sides, achieving a 100% surface inspection rate. Pressure rollers 5 are installed above the side of the power rollers 6 closest to the inspection line base 1. At the same time, the diameter of each roller on the power rollers 6 used to transport seamless steel pipes gradually increases from the middle to both ends. Therefore, the pressure rollers 5 press the seamless steel pipes tightly, keeping them in the center position of the power rollers as they pass through the inspection mechanism, ensuring that the inspection distance of each seamless steel pipe is consistent and without deviation, avoiding missed inspections due to excessively long inspection distances in some positions.

[0022] The pressure roller 5 is driven by a parallelogram linkage mechanism 503. Two adjacent shafts of the linkage mechanism 503 are mounted on an n-shaped mounting bracket 501. The mounting bracket 501 is mounted above the power roller 6 on the side near the detection line base 1. A telescopic cylinder 502 is rotatably mounted on the mounting bracket 501. A connecting block 505 is mounted at the end of the telescopic rod of the telescopic cylinder 502. The connecting block 505 is rotatably connected to the upper shaft of the remaining two shafts of the linkage mechanism 503. A roller 504 is rotatably mounted on the last shaft at the bottom. The telescopic cylinder 502 pushes the connecting block 505 through the telescopic rod. The connecting block 505 drives the roller 504 downward through the linkage mechanism 503, pressing the seamless steel pipe at the center position of the power roller 6.

[0023] A cleaning mechanism is set on one side of one of the power rollers 6 away from the base 1 of the inspection line to clean the impurities on the surface of the seamless steel pipe to be inspected, so as to avoid the impurities affecting the inspection results.

[0024] The main body of the cleaning mechanism is the cleaning box 7. The interior of the cleaning box 7 is divided into two interconnected cavities by a partition. A double-roller conveyor mechanism 10 is installed at the connection between the two cavities. The double-roller conveyor mechanism 10 adopts a double-inclined roller conveying form, allowing the seamless steel pipe to be rotatably conveyed into the right cavity. When the seamless steel pipe passes through the left cavity, a solvent to remove the oil film is sprayed by a solvent sprayer 9. The solvent used is an alkaline degreasing agent (concentration 5%). When the seamless steel pipe is conveyed to the right cavity by the double-roller conveyor mechanism 10, it begins to rotate around its axis. In the right cavity, the wire drawing brush drive base 11 drives the wire drawing brush 13 to rotate via a drive motor. This process cleans the surface of the seamless steel pipe, removing oil and oxide layers through the combined action of solvent and wire brush. The surface roughness of the cleaned seamless steel pipe reaches Ra≤1.6μm, and the surface cleanliness reaches ISO8501-1Sa2.5 level. The position of the wire brush 13 is controlled by a hydraulic cylinder. The hydraulic cylinder pushes the wire brush drive base 11 to slide and adjust its position on the slide rail 12. A limit switch is installed on the wire brush drive base 11 to limit the distance between the wire brush 13 and the workpiece to be brushed. When the distance between the wire brush 13 and the workpiece reaches the theoretical minimum distance, the workpiece touches the contact of the limit switch, causing the hydraulic cylinder to stop pushing.

[0025] A sealing mechanism is installed at the outlet and inlet at both ends of the cleaning chamber 7 to prevent solvent or cleaned impurities from splashing. The sealing mechanism consists of a sealing ring mounting seat 8 installed at the outlet and inlet and a lip seal 14 installed on the inner wall of the sealing ring mounting seat 8, which is used to fill the gap between the workpiece and the outlet or inlet.

[0026] Although the invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0027] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0030] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A multi-axis seamless steel pipe flaw detection line, comprising a detection line base (1) and a detection mechanism, characterized in that: The testing mechanism includes a magnetic flux leakage flaw detector (4), an eddy current detector (3) and an ultrasonic detector (2). The magnetic flux leakage flaw detector (4), the eddy current detector (3) and the ultrasonic detector (2) are installed sequentially above the testing line base (1). Power rollers (6) are symmetrically installed on both sides of the testing line base (1). A pressure roller (5) is installed on the side of the power roller (6) near the testing mechanism. One of the power rollers (6) is equipped with a steel pipe surface cleaning mechanism on the side away from the detection line base (1). The steel pipe surface cleaning mechanism includes a cleaning box (7). The interior of the cleaning box (7) is divided into two interconnected cavities by a partition. A double roller conveying mechanism (10) is installed at the connection of the two cavities. A solvent sprayer (9) and a wire drawing brush drive base (11) are respectively installed in the two cavities. The solvent sprayer (9) is installed above the space. The wire drawing brush drive base (11) is connected by a slide rail (1). 2) Installed in the space, the wire drawing brush drive base (11) is slidably installed in the slide rail (12), at least one wire drawing brush (13) is installed above the wire drawing brush drive base (11), a drive motor for driving the wire drawing brush (13) is installed on the wire drawing brush drive base (11), a hydraulic cylinder for pushing the wire drawing brush drive base (11) is installed on the slide rail (12), and the extension end of the hydraulic cylinder is connected to the wire drawing brush drive base (11). Sealing mechanisms are installed on both sides of the cleaning box (7) at the inlet and outlet.

2. The multi-axis seamless steel pipe flaw detection line according to claim 1, characterized in that: The double roller conveying mechanism (10) adopts a double inclined roller conveying mechanism.

3. The multi-axis seamless steel pipe flaw detection line according to claim 1, characterized in that: The wire drawing brush drive base (11) is equipped with a limit switch for limiting the distance between the wire drawing brush (13) and the workpiece.

4. The multi-axis seamless steel pipe flaw detection line according to claim 1, characterized in that: The sealing mechanism includes a sealing ring mounting seat (8) and a lip seal (14). The sealing ring mounting seat (8) is installed on the inlet and outlet of the cleaning box (7) respectively, and the lip seal (14) is installed on the inner wall of the sealing ring mounting seat (8).

5. A multi-axis seamless steel pipe flaw detection line according to claim 1, characterized in that: The pressure roller (5) includes an n-shaped mounting frame (501), a telescopic cylinder (502), a parallelogram-shaped linkage mechanism (503), a roller (504), and a connecting block (505). The mounting frame (501) is mounted above the power roller (6) on the side near the detection line base (1). Two adjacent shafts of the linkage mechanism (503) are mounted on the mounting frame (501). The connecting block (505) and the roller (504) are rotatably mounted on two shafts of the linkage mechanism (503) that are not mounted on the mounting frame (501). The telescopic cylinder (502) is rotatably mounted on the mounting frame (501), and the telescopic rod of the telescopic cylinder (502) is connected to the connecting block (505).

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