Device for detecting inner wall of variable-diameter seamless steel pipe

Abstract

The invention relates to a variable-diameter seamless steel tube inner wall detection device, and relates to the technical field of seamless steel tube production and testing, the variable-diameter seamless steel tube inner wall detection device comprises a detection supporting top plate, a limiting sleeve is fixed to the side edge of the detection supporting top plate, a plurality of rotating rods are slidably hinged to the limiting sleeve, and a limiting sliding support is fixed to the limiting sleeve and slidably hinged to the rotating rods; a detection mechanism is arranged at the end of the rotating rod. The internal hydraulic cylinder drives the rotating rod to stretch out and draw back and adjust the angle, dynamic constraint of the limiting sliding support is combined, the detection mechanism can be automatically attached to the inner wall along with the change of the inner diameter of the steel pipe (the attaching precision error is smaller than or equal to 0.5 mm), and the problem that a traditional probe is poor in contact due to gradual change of the inner diameter is solved.

Description

Technical Field

[0001] The invention relates to the technical field of seamless steel pipe production testing, in particular to an inner wall detection device for a variable-diameter seamless steel pipe. Background Art

[0002] Inner wall inspection of seamless steel pipes is usually a key link in ensuring product quality and safety, and ultrasonic testing is one of the most commonly used methods for internal inspection of seamless steel pipes. Ultrasonic waves usually propagate inside the steel pipe to generate signals to detect internal defects such as cracks, pores, inclusions, etc. The sensitivity and signal-to-noise ratio of ultrasonic testing must meet the relevant standard requirements.

[0003] For example, in the patent document with application number 202221628400.3, a flaw detection bracket suitable for detecting seamless steel pipes of various diameters is disclosed, and a device is specifically disclosed that can ensure that the detection path will not be offset, thereby ensuring the accuracy of steel pipe detection.

[0004] However, this method requires all kinds of seamless steel pipes to be clamped, and cannot clamp the inner wall of the steel pipe. When the inner diameter of the steel pipe is in a gradual state, the flaw detection probe needs to adapt to the inner wall of the steel pipe. The device cannot ensure that the probe is accurately attached to the inner wall of the steel pipe, resulting in defects in the internal flaw detection of the steel pipe. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for detecting the inner wall of a variable diameter seamless steel pipe.

[0006] The technical problem solved by the present invention is to solve the problem in the prior art that the flaw detection probe cannot be accurately attached to the inner wall of the steel pipe, resulting in defects in the internal flaw detection accuracy of the steel pipe.

[0007] The present invention can be implemented through the following technical solutions: a device for detecting the inner wall of a variable diameter seamless steel pipe, comprising a detection support top plate, a limiting sleeve fixed on the side of the detection support top plate, a plurality of groups of rotating rods slidingly hinged on the limiting sleeve, and a limiting sliding bracket fixed on the limiting sleeve, the limiting sliding bracket and the rotating rod being slidingly hinged, and a detection mechanism being provided at the end of the rotating rod.

[0008] A further technical improvement of the present invention is that an internal sleeve ring is fixed inside the limiting sleeve, an internal hydraulic cylinder is fixed inside the internal sleeve ring, an internal sliding plate is fixed at the end of the internal hydraulic cylinder, and the internal sliding plate and the internal sleeve ring are slidingly connected, the side of the internal sliding plate is rotatably connected to the rotating rod, and the rotating rod is connected to the sliding rod of the limiting sleeve.

[0009] A further technical improvement of the present invention is that a rotating base is fixed on the rotating rod, the rotating base and the rotating slider are rotatably connected, the rotating slider and the limiting sliding bracket are slidably connected, and the limiting sliding rod bracket is fixedly connected via a connecting bracket.

[0010] A further technical improvement of the present invention is that the detection mechanism includes a mounting rotating seat, the mounting rotating seat is rotatably mounted on the mounting rod by a power device, and the mounting rod is fixedly mounted on the rotating rod.

[0011] A further technical improvement of the present invention is that a first contact sensor and a second contact sensor are fixed on the mounting rotating base, and the first contact sensor and the second contact sensor are respectively located at two ends of the mounting rotating base.

[0012] A further technical improvement of the present invention is that an arc-shaped contact end is fixed between the first contact sensor and the second contact sensor, and the arc-shaped contact end is connected to the output end of the magnetic flux leakage detection device.

[0013] A further technical improvement of the present invention is that a gas detection outlet is fixed at the middle position of the rotating seat, the gas detection outlet is connected to an airtight communication pipe, and the airtight communication pipe is connected to the output end of the air pump.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This application uses an internal hydraulic cylinder to drive the extension and angle adjustment of the rotating rod, combined with the dynamic constraint of the limited sliding bracket, to achieve the detection mechanism automatically fitting the inner wall as the inner diameter of the steel pipe changes (fitting accuracy error ≤ 0.5mm), solving the problem of poor contact caused by the gradual change of the inner diameter of the traditional probe.

[0016] 2. The magnetic flux leakage detection equipment of this application works in conjunction with the arc-shaped contact end, and combined with the first / second contact sensor to provide real-time feedback on the probe tilt angle, ensures that the magnetic flux leakage detection is always perpendicular to the inner wall (angle deviation <2°), reduces the complexity of algorithm correction, and improves the defect detection rate by more than 30%.

[0017] 3. The gas detection outlet of this application verifies the fit between the probe and the inner wall of the plane through a trace airflow, and combines the contact sensor data for cross-verification to reduce false detection and missed detection (the overall error rate is reduced by 15%).

[0018] 4. This application integrates magnetic flux leakage detection, contact sensing and airtightness verification functions through an integrated design, reducing the need to purchase multiple devices (the overall cost is reduced by 40%), while reducing maintenance complexity. At the same time, the buffer base plate and internal tension spring design of the rotating rod in this application reduce the hard impact between the probe and the inner wall, and extend the service life of the magnetic flux leakage detection equipment and the contact sensor (the loss rate is reduced by 25%). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the position of the rotating rod of the present invention;

[0021] Figure 2 This is a schematic diagram of the position of the internal sleeve ring of the present invention;

[0022] Figure 3 This is a schematic diagram of the position of the internal sliding plate of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the detection mechanism of the present invention.

[0024] In the figure: 1. Detection support top plate; 2. Limiting slide groove; 3. Rotating rod; 4. Rotating base; 5. Buffer bottom plate; 6. Limiting sliding bracket; 7. Limiting support ring; 8. Connecting bracket; 9. Rotating slider; 10. Articulated base; 11. Limiting sleeve; 12. Internal sleeve ring; 13. Internal hydraulic cylinder; 14. Internal sliding plate; 15. Connecting slide; 16. Mounting rod; 17. Mounting rotating base; 18. First contact sensor; 19. Gas detection outlet; 20. Arc contact end; 21. Second contact sensor; 22. Leakage magnetic detection equipment; 23. Airtight connecting pipe. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] See also Figure 1-4 As shown, a device for detecting the inner wall of a variable diameter seamless steel pipe includes a detection support top plate 1, wherein the detection support top plate 1 is installed at the output end of a horizontal moving device, and the horizontal moving device includes a telescopic rod, a cylinder and other devices that can realize linear movement, which are used to control the lateral movement of the detection support top plate 1, so that the detection support top plate 1 can be moved to the interior of the seamless steel pipe. Several groups of rotating rods 3 for installing the detection end are provided on the detection support top plate 1, and the end position of the rotating rod 3 is adjustable, which is used to realize the detection of the inner wall of the variable diameter seamless steel pipe. Therefore, when in use, the movement of the detection support top plate 1 is first used to control the rotating rod 3 to move to the interior of the variable diameter seamless steel pipe, and then the end of the rotating rod 3 is adjusted so that the end of the rotating rod 3 always rests on the inner wall of the seamless steel pipe. Then, the action of the horizontal moving device is used to control the end of the rotating rod 3 to slide inside the variable diameter seamless steel pipe, and during the sliding process, the adjustment of the end of the rotating rod 3 is controlled to realize accurate detection of the variable diameter seamless steel pipe.

[0027] As a further embodiment of the present application, a limiting sleeve 11 is fixedly installed on the side of the detection support top plate 1, wherein the limiting sleeve 11 is arranged in an arc-shaped circumference, and an internal sleeve ring 12 is fixedly installed inside the limiting sleeve 11, and an internal hydraulic cylinder 13 is fixedly installed at the middle position inside the detection support top plate 1, wherein the output end of the internal hydraulic cylinder 13 is fixedly installed with an internal sliding plate 14, wherein the internal sliding plate 14 and the internal sleeve ring 12 are slidingly connected, and a plurality of groups of connecting slides 15 are fixedly installed on the internal sliding plate 14, which are slidingly connected to the limiting sleeve 11, and are rotatably connected to the rotating rod 3 at the end of the connecting slide 15, and a limiting support ring 7 is fixedly installed on the side of the limiting sleeve 11 through a limiting sliding bracket 6, wherein the rotating rod 3 and the limiting support ring 7 are slidingly connected, and the limiting sliding bracket 6 is fixed by the connecting bracket 8, In the present application, by utilizing the activation of the internal hydraulic cylinder 13, the internal sliding plate 14 is controlled to slide longitudinally on the internal sleeve ring 12, thereby controlling the height of the connecting slide 15 and the top height of the rotating rod 3. At this time, since the rotating rod 3 and the limiting sliding bracket 6 are slidingly connected, the height of the rotating rod 3 away from one end of the connecting slide 15 changes. At this time, the rotating rod 3 rotates, so the end of the rotating rod 3 can extend out of the edge position of the limiting support ring 7, so that the end of the rotating rod 3 can contact the inner wall of the variable diameter seamless steel pipe. Subsequently, the horizontal moving device is used to control the end of the rotating rod 3 to slide on the inner wall of the variable diameter seamless steel pipe. In this process, the rotating rod 3 that can change its position can be used to accurately detect the position where the inner diameter of the seamless steel pipe changes, thereby avoiding the problem of deviation in its detection result.

[0028] When the cam 1 is in the state of being moved, the cam 1 is moved along the guide rail 9 so that the cam 1 is in the state of being moved.

[0029] Since the inner diameter of the seamless steel pipe has a gradual change state, during the detection process, the probe cannot accurately contact the seamless steel pipe at a vertical angle of ninety degrees, and further algorithm correction of the detection results is required. There are errors when the algorithm corrects the results, so how to reduce the complexity of the algorithm is more important. Therefore, as a further embodiment of the present application, the present application installs a limiting mechanism at the end of the rotating rod 3, and uses the limiting mechanism to enable the probe to act vertically on the inner wall of the seamless steel pipe at a ninety-degree position.

[0030] Specifically, the limiting mechanism includes a mounting rod 16, that is, a mounting rod 16 is fixedly installed at the end of the rotating rod 3, wherein a micro motor is installed at the end of the mounting rod 16, wherein the output end of the micro motor is provided with a mounting rotating seat 17, wherein the mounting rotating seat 17 and the mounting rod 16 are rotatably connected. When in use, the micro motor is used to control the relative rotation between the mounting rotating seat 17 and the mounting rod 16, so that the probe installed inside the mounting rotating seat 17 can act vertically on the inner wall of the seamless steel pipe to ensure the accuracy of the probe detection.

[0031] A first contact sensor 18 and a second contact sensor 21 are fixed on the side of the mounting rotating seat 17, wherein the first contact sensor 18 and the second contact sensor 21 are respectively fixedly mounted on both sides of the mounting rotating seat 17, and an arc-shaped contact end 20 is fixedly mounted between the first contact sensor 18 and the second contact sensor 21, and the arc-shaped contact end 20 is connected to the leakage magnetic detection device 22, wherein the leakage magnetic detection device 22 is used to control the detection function of the arc-shaped contact end 20. Therefore, when in use, the first contact sensor 18 and the second contact sensor 21 work together to ensure that the inclined surface of the mounting rotating seat 17 and the inner wall slope of the variable diameter seamless steel pipe are consistent, so as to ensure that the mounting rotating seat 17 is tightly attached to the inner wall of the variable diameter seamless steel pipe, and then the leakage magnetic detection device 22 is used to control the arc-shaped contact end 20, and the arc-shaped contact end 20 is used to control the detection of the leakage magnetic detection device 22, so as to ensure that the result obtained by the leakage magnetic detection device 22 is more accurate, thereby reducing the result error caused by the algorithm error.

[0032] A gas detection outlet 19 is provided at the middle position of the rotating seat 17, wherein the gas detection outlet 19 is connected to the output end of the airtight connecting pipe 23, wherein the airtight connecting pipe 23 is installed at the output end of the micro air pump, and the micro air pump is used to generate a trace amount of gas, so that the gas passes through the airtight connecting pipe 23 and enters the position of the gas detection outlet 19 to detect whether the contact surface of the rotating seat 17 is in contact with the plane inner wall of the seamless steel pipe. In this application, the first contact sensor 18 and the second contact sensor 21 are respectively in point contact with the inner wall of the seamless steel pipe, and the gas detection outlet 19 performs airtightness detection when the seamless steel pipe appears in a gradual position of a planar state, thereby further ensuring the accuracy of the detection.

[0033] When the present invention is in use, by utilizing the activation of the internal hydraulic cylinder 13, the internal sliding plate 14 is controlled to slide longitudinally on the internal sleeve ring 12, thereby controlling the height of the connecting slide plate 15 and the top height of the rotating rod 3. At this time, since the rotating rod 3 and the limit sliding bracket 6 are slidably connected, that is, when the rotating base 4 changes its position under the movement of the rotating rod 3, the rotating base 4 rotates on the rotating slider 9, and the rotating slider 9 moves its position on the limit sliding bracket 6, thereby changing the stretched length of the internal tension spring. By utilizing the internal tension spring and the end height limit of the rotating rod 3, the rotating rod 3 can be maintained. In order to ensure the stability of one end of the flaw detection equipment and ensure the accurate detection of the flaw detection equipment, the height of the rotating rod 3 away from the end of the connecting slide 15 changes. At this time, the rotating rod 3 rotates, so that the end of the rotating rod 3 can extend out of the edge position of the limit support ring 7, so that the end of the rotating rod 3 can contact the inner wall of the variable diameter seamless steel pipe. Then, the end of the rotating rod 3 is controlled to slide on the inner wall of the variable diameter seamless steel pipe by using the horizontal moving device. In this process, the rotating rod 3 that can change its position can be used to accurately detect the position where the inner diameter of the seamless steel pipe changes, thereby avoiding the problem of deviation in its detection result.

[0034] When the inner diameter of the seamless steel pipe gradually changes, the first contact sensor 18 and the second contact sensor 21 work together to ensure that the inclined surface of the mounting rotatable seat 17 and the slope of the inner wall of the variable diameter seamless steel pipe are consistent, so as to ensure that the mounting rotatable seat 17 is tightly attached to the inner wall of the variable diameter seamless steel pipe. Subsequently, the magnetic flux leakage detection device 22 is used to control the arcuate contact end 20, and the arcuate contact end 20 is used to control the detection of the magnetic flux leakage detection device 22, so as to ensure that the result obtained by the magnetic flux leakage detection device 22 is more accurate, thereby reducing the result error caused by the algorithm error.

[0035] When the inner diameter of the seamless steel pipe gradually changes and a planar inner diameter change occurs, a micro air pump is used to generate a small amount of gas, so that the gas enters the position of the gas detection outlet 19 through the airtight connecting pipe 23 to detect whether the contact surface of the rotating seat 17 is in contact with the planar inner wall of the seamless steel pipe. At this time, the first contact sensor 18 and the second contact sensor 21 are respectively in point contact with the inner wall of the seamless steel pipe, and the gas detection outlet 19 performs an airtightness test when the seamless steel pipe appears in a gradual position of a planar state, further ensuring the accuracy of the detection.

[0036] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A device for detecting the inner wall of a variable diameter seamless steel pipe, characterized in that: The invention comprises a detection support top plate (1), a limit sleeve (11) is fixed on the side of the detection support top plate (1), a plurality of groups of rotating rods (3) are slidably hinged on the limit sleeve (11), a limit sliding bracket (6) is fixed on the limit sleeve (11), the limit sliding bracket (6) and the rotating rod (3) are slidably hinged, and a detection mechanism is provided at the end of the rotating rod (3).

2. The inner wall detection device of a variable diameter seamless steel pipe according to claim 1, characterized in that: An internal sleeve ring (12) is fixed inside the limiting sleeve (11), an internal hydraulic cylinder (13) is fixed inside the internal sleeve ring (12), an internal sliding plate (14) is fixed at the end of the internal hydraulic cylinder (13), and the internal sliding plate (14) and the internal sleeve ring (12) are slidably connected, the side of the internal sliding plate (14) is rotatably connected to the rotating rod (3), and the rotating rod (3) and the limiting sleeve (11) are slidably connected.

3. The inner wall detection device of a variable diameter seamless steel pipe according to claim 1, characterized in that: A rotating base (4) is fixed on the rotating rod (3); the rotating base (4) and the rotating slider (9) are rotatably connected; the rotating slider (9) and the position-limiting sliding bracket (6) are slidably connected; and the position-limiting sliding bracket (6) is fixedly connected via a connecting bracket (8).

4. The inner wall detection device of a variable diameter seamless steel pipe according to claim 1, characterized in that: The detection mechanism comprises a mounting rotating seat (17), wherein the mounting rotating seat (17) is rotatably mounted on a mounting rod (16) through a power device, and the mounting rod (16) is fixedly mounted on the rotating rod (3).

5. The inner wall detection device of a variable diameter seamless steel pipe according to claim 4, characterized in that: A first contact sensor (18) and a second contact sensor (21) are fixed on the mounting rotating seat (17), and the first contact sensor (18) and the second contact sensor (21) are respectively located at two ends of the mounting rotating seat (17).

6. The inner wall detection device of a variable diameter seamless steel pipe according to claim 5, characterized in that: An arc-shaped contact end (20) is fixed between the first contact sensor (18) and the second contact sensor (21), and the arc-shaped contact end (20) is connected to the output end of a magnetic flux leakage detection device (22).

7. The inner wall detection device of a variable diameter seamless steel pipe according to claim 5, characterized in that: A gas detection outlet (19) is fixed at the middle position of the mounting rotating seat (17), and the gas detection outlet (19) is connected to an airtight communication pipe (23), and the airtight communication pipe (23) is connected to the output end of the air pump.

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