A steel pipe centering device for steel pipe ultrasonic flaw detection
By designing a centering device for ultrasonic testing of steel pipes, and adopting a motor-driven spacing adjustment and eccentric wheel mechanism, the problem of difficult adjustment of the clamping device was solved, achieving precise centering and full coverage testing of steel pipes of different specifications, and improving the flexibility and reliability of the testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 重庆壹航自动化设备有限公司
- Filing Date
- 2025-08-14
- Publication Date
- 2026-08-04
AI Technical Summary
In existing ultrasonic flaw detection devices for steel pipes, the clamping device is difficult to adjust the spacing precisely, which leads to the steel pipe being eccentric or tilted, and the coupling between the ultrasonic probe and the surface of the steel pipe is unstable, affecting the accuracy of the detection signal.
A steel pipe centering device was designed, which includes a spacing adjustment mechanism and a reciprocating pushing mechanism. The spacing adjustment mechanism driven by a motor and the eccentric wheel drive the sliding plate to achieve precise adjustment of the clamping device. Combined with the gear transmission system driven by a servo motor, it ensures that the flaw detector can perform full scanning and full circumferential flaw detection along the length of the steel pipe.
It enables precise centering of steel pipes of different specifications, improves the flexibility and efficiency of testing, ensures the comprehensiveness and reliability of testing, and avoids blind spots and misjudgments.
Smart Images
Figure CN224594579U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel pipe testing technology, and in particular to a steel pipe centering device for ultrasonic flaw detection of steel pipes. Background Technology
[0002] A steel pipe centering device is a device used to accurately position the center and axis of a steel pipe. It corrects the positional deviation of the steel pipe during the inspection process through mechanical structure or sensing technology, ensuring that its geometric center coincides with the reference axis of the inspection system. In ultrasonic testing of steel pipes, the centering device is a key auxiliary device, because the ultrasonic probe needs to be perpendicular to the surface of the steel pipe and maintain a stable coupling distance in order to obtain accurate defect signals.
[0003] A search revealed that Chinese Publication No. CN213715124U discloses a steel pipe centering device for ultrasonic intelligent flaw detection of steel pipes. The device includes a main body, casters, a switch button, a level, a placement slot, a hydraulic device, a lifting device, a clamping device, and a drive motor. The drive motor is located below the main body, with casters on both sides. A lifting device is located above the casters, comprising a telescopic rod, a locking groove, and a locking block. A level is located outside the main body, and a clamping device is located inside the placement slot, comprising a pressing groove, a support column, and an anti-slip pad. Hydraulic devices are located on both sides of the placement slot, comprising hydraulic cylinders, hydraulic push rods, and circuitry. The main advantage of installing the lifting device at the bottom of the main body is that the height of the main body can be adjusted by lifting the telescopic rod, effectively adapting the device to various terrains and demonstrating its practicality and multifunctionality.
[0004] The patent specification mentions that "the placement groove is equipped with a clamping device." For steel pipes of different specifications or those with slight bends or ellipticity, the clamping device needs to be adjusted in spacing to ensure that the axis of the steel pipe is precisely aligned with the axis of the flaw detection equipment. If the adjustment is difficult, the steel pipe is prone to eccentricity or tilting, which leads to unstable coupling gap between the ultrasonic probe and the surface of the steel pipe, deviation of the sound wave propagation path, weakening or distortion of the defect reflection signal, failure to detect fine cracks, delamination and other defects, or misjudgment of defects due to signal interference. In response to the above problems, a steel pipe centering device for ultrasonic flaw detection of steel pipes is proposed. Utility Model Content
[0005] The purpose of this invention is to provide a steel pipe centering device for ultrasonic testing of steel pipes, which solves the problem that some existing steel pipe centering devices for ultrasonic testing of steel pipes have difficulty adjusting the spacing of the clamping device.
[0006] To achieve the above objectives, this utility model provides a steel pipe centering device for ultrasonic testing of steel pipes, including a mounting base plate. Limiting brackets are fixedly connected to the top front and rear sides of the mounting base plate. A spacing adjustment mechanism is fixedly connected to the top of the mounting base plate, and a reciprocating pushing mechanism is fixedly connected to the outer left side of the mounting base plate.
[0007] The spacing adjustment mechanism includes a motor, which is externally fixedly connected to the top of the mounting base plate. A drive plate is fixedly connected to the drive end of the motor. Connecting shafts are fixedly connected to the left and right sides of the drive plate. A follower plate is rotatably connected to the outside of the connecting shaft. A sliding block is rotatably connected to the outside of the follower plate. A support plate is fixedly connected to the top of the sliding block. A drive assembly is fixedly connected to the top of the support plate.
[0008] As a further description of the above technical solution:
[0009] The drive assembly includes a second motor, which is externally fixedly connected to the top of the support plate, and a gear is fixedly connected to the drive end of the second motor.
[0010] As a further description of the above technical solution:
[0011] The reciprocating pushing mechanism includes a motor three. The motor three is fixedly connected to the outer left side of the mounting base plate. An eccentric wheel is fixedly connected to the drive end of the motor three. A rotating plate is rotatably connected to the outer top of the eccentric wheel. A sliding plate is rotatably connected to the outer side of the rotating plate. A mounting plate is fixedly connected to the outer right side of the sliding plate. Multiple flaw detectors are fixedly connected to the top of the mounting plate.
[0012] As a further description of the above technical solution:
[0013] The top four corners of the support plate are fixedly connected to support rods, and the tops of the two support rods are fixedly connected to mounting brackets.
[0014] As a further description of the above technical solution:
[0015] The mounting bracket is internally rotatably connected to a gear ring, and the outer side of the gear ring is meshed with the outer side of the first gear.
[0016] As a further description of the above technical solution:
[0017] The gear ring is internally fixedly connected to multiple telescopic rods, and the other end of each telescopic rod is fixedly connected to a clamping plate. A return spring is sleeved on the outside of each telescopic rod.
[0018] As a further description of the above technical solution:
[0019] The sliding block is internally slidably connected to the outside of the limiting bracket, and the outside of the follower plate is in contact with the outside of the limiting bracket;
[0020] As a further description of the above technical solution:
[0021] One end of the return spring is fixedly connected to the outside of the gear ring, and the other end of the return spring is fixedly connected to the outside of the clamping plate.
[0022] 1. In this utility model, the starting motor drives the drive plate to rotate, and the follower plate drives the sliding block to slide outside the limit bracket via the connecting shaft, thereby driving the two support plates to move to achieve spacing adjustment. The adjustment is convenient and precise, and can adapt to the needs of different specifications of workpieces, improve the versatility and operational flexibility of the device, and ensure the adaptability and efficiency of the operation.
[0023] 2. In this utility model, the starting motor drives the eccentric wheel to rotate, causing the rotating plate to slide through the sliding plate and drive the mounting plate to slide. The support plate reciprocates with the mounting plate to inspect the steel pipe. The reciprocating motion covers the entire area, ensuring no blind spots in the inspection. It is suitable for the inspection needs of steel pipes of different lengths, is convenient and efficient to operate, improves the accuracy of inspection and work efficiency, and ensures the reliability of steel pipe quality inspection. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0025] Figure 1 This is a three-dimensional schematic diagram of a steel pipe centering device for ultrasonic flaw detection of steel pipes proposed in this utility model.
[0026] Figure 2 This is a schematic diagram of the drive plate of a steel pipe centering device for ultrasonic flaw detection of steel pipes proposed in this utility model.
[0027] Figure 3 This is a schematic diagram of the structure of a steel pipe centering device for ultrasonic testing of steel pipes proposed in this utility model.
[0028] Figure 4 This is a schematic diagram of the clamping plate of a steel pipe centering device for ultrasonic flaw detection of steel pipes proposed in this utility model.
[0029] In the diagram: 1. Mounting base plate; 2. Limiting bracket; 3. Spacing adjustment mechanism; 31. Motor 1; 32. Drive plate; 33. Connecting shaft; 34. Follower plate; 35. Sliding block; 36. Support plate; 37. Drive assembly; 371. Motor 2; 372. Gear 1; 4. Reciprocating pushing mechanism; 41. Motor 3; 42. Eccentric wheel; 43. Rotating plate; 44. Sliding plate; 45. Mounting plate; 46. Flaw detector; 5. Support rod; 6. Mounting bracket; 7. Gear ring; 8. Telescopic rod; 9. Return spring; 10. Clamping plate. Detailed Implementation
[0030] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0031] Reference Figures 1 to 3 This utility model provides an embodiment of a steel pipe centering device for ultrasonic flaw detection of steel pipes, comprising a mounting base plate 1. The mounting base plate 1 serves as the supporting foundation for the entire device, providing a stable mounting platform for each component and capable of withstanding various forces generated during device operation. Limiting brackets 2 are fixedly connected to the top front and rear sides of the mounting base plate 1. A motor 41 serves as the power source for the reciprocating pushing mechanism, capable of converting electrical energy into mechanical energy, providing a continuous and controllable driving force for the movement of the entire mechanism. A spacing adjustment mechanism 3 is fixedly connected to the top of the mounting base plate 1, and a reciprocating pushing mechanism is fixedly connected to the outer left side of the mounting base plate 1. Mechanism 4, the reciprocating pushing mechanism 4 includes motor 3 41, which serves as the power source for the reciprocating pushing mechanism and can convert electrical energy into mechanical energy, providing a continuous and controllable driving force for the movement of the entire mechanism. Motor 3 41 is externally fixedly connected to the outer left side of the mounting base plate 1. An eccentric wheel 42 is fixedly connected to the driving end of motor 3 41. The eccentric wheel 42 has a disc-shaped structure, and its geometric center has a certain eccentricity with the axis of the driving end of motor 3 41. A rotating plate 43 is rotatably connected to the outer top of the eccentric wheel 42. One end of the rotating plate 43 is connected to the edge of the eccentric wheel 42, and the other end is connected to the sliding plate 44.
[0032] Under the rotation of the eccentric wheel 42, the rotating plate 43 will reciprocate and swing with the rotation of the eccentric wheel 42, which plays the role of transmitting power and changing the direction of motion. The external of the rotating plate 43 is rotatably connected to the sliding plate 44. The swinging motion of the rotating plate 43 is transmitted to the sliding plate 44 through the pin, causing the sliding plate 44 to reciprocate and slide on the mounting base plate 1, providing a motion carrier for the mounting plate 45 and the flaw detector 46. The mounting plate 45 is fixedly connected to the external right side of the sliding plate 44, and the mounting plate 45 provides a motion carrier for the flaw detector 46. After setting up the installation base, multiple flaw detectors 46 are fixed at preset intervals and angles to ensure that the detectors can accurately align with the inspection parts of the steel pipe. At the same time, they move together with the sliding plate 44 to achieve comprehensive inspection of the steel pipe. Multiple flaw detectors 46 are fixedly connected to the top of the mounting plate 45. Driven by the reciprocating pushing mechanism 4, the flaw detectors 46 can reciprocate along the length of the steel pipe to perform comprehensive scanning of all parts of the steel pipe, ensuring that no potential defects are missed and improving the reliability of flaw detection.
[0033] The spacing adjustment mechanism 3 includes a motor 31, which serves as the power source for the spacing adjustment mechanism, providing stable rotational power. By precisely controlling the rotation angle of the motor, precise control of the spacing adjustment is achieved to adapt to the centering requirements of steel pipes of different diameters. The motor 31 is externally fixedly connected to the top of the mounting base plate 1. A drive plate 32 is fixedly connected to the drive end of the motor 31. When the motor 31 starts, the drive end drives the drive plate 32 to rotate synchronously. The drive plate 32, as the intermediate carrier for power transmission, transmits the rotational motion of the motor to the connecting shafts 33 on both sides, thereby driving the entire adjustment mechanism to move. Connecting shafts are fixedly connected to both the left and right sides of the drive plate 32. 33. The connecting shaft 33 provides a fulcrum for the follower plate 34, ensuring that the follower plate 34 can rotate flexibly around the connecting shaft 33, realizing the transmission of power and the conversion of the direction of motion. The follower plate 34 is rotatably connected to the outside of the connecting shaft 33. Under the rotation of the drive plate 32, the follower plate 34 will perform reciprocating oscillating motion, converting the rotational motion of the drive plate 32 into the linear sliding motion of the sliding block 35. The sliding block 35 is rotatably connected to the outside of the follower plate 34. Under the drive of the follower plate 34, the sliding block 35 can realize synchronous reverse movement on the left and right sides. That is, when one side of the sliding block 35 moves to the left, the other side of the sliding block 35 moves to the right, thereby realizing the function of adjusting the distance.
[0034] A support plate 36 is fixedly connected to the top of the sliding block 35. The main function of the support plate 36 is to support and fix the drive assembly 37, connecting the drive assembly 37 and the sliding block 35 into a whole. The drive assembly 37 includes a second motor 371. The second motor 371 is a servo motor with adjustable speed. Its exterior is fixedly connected to the preset mounting position on the top of the support plate 36 by bolts, providing a stable driving force for the rotation of the steel pipe. The exterior of the second motor 371 is fixedly connected to the top of the support plate 36. A first gear 372 is fixedly connected to the drive end of the second motor 371. When the second motor 371 starts, the drive end drives the first gear 372 to rotate synchronously. The first gear 372, as a power output component, can mesh with the driven gear on the steel pipe support structure to transmit the rotational power of the motor to the steel pipe, drive the steel pipe to rotate, thereby realizing the flaw detection of the entire circumference of the steel pipe.
[0035] Reference Figures 2 to 4 Support rods 5 are fixedly connected to the top four corners of the support plate 36. The support rods 5 have good load-bearing capacity and stability. The main function of the support rods 5 is to support the mounting frame 6 and stably erect the mounting frame 6 above the support plate 36, providing installation space for components such as the gear ring 7. The top of the two support rods 5 is fixedly connected to the mounting frame 6. The mounting frame 6 is equipped with rotating support components such as bearings inside, providing a stable installation base and support point for the rotation of the gear ring 7, ensuring that the gear ring 7 can rotate flexibly inside the mounting frame 6. The gear ring 7 is rotatably connected inside the mounting frame 6. The gear ring 7 is a ring gear structure. Its outer ring is machined with uniform teeth, and its inner ring is used to connect the telescopic rod 8. The outer side of the gear ring 7 is meshed with the outer side of the gear 372. Multiple telescopic rods 8 are fixedly connected inside the gear ring 7.
[0036] The telescopic rod 8 adopts a telescopic sleeve structure, which can adjust its length according to the diameter of the steel pipe, thereby driving the clamping plate 10 to adapt to steel pipes of different diameters and ensuring that the clamping plate 10 can make tight contact with the surface of the steel pipe. The other end of the telescopic rod 8 is fixedly connected to the clamping plate 10. When the telescopic rod 8 is extended or retracted, the clamping plate 10 will move accordingly. Multiple clamping plates 10 work together to clamp the steel pipe from different directions, realizing the centering and fixing of the steel pipe, preventing radial displacement of the steel pipe during the inspection process, and ensuring the accuracy of flaw detection. A return spring 9 is sleeved on the outside of the telescopic rod 8. When the steel pipe is placed between the clamping plates 10, a return spring 9 is provided. When the steel pipe pushes the clamping plate 10 outward, the telescopic rod 8 extends, and the return spring 9 is stretched and stores elastic potential energy. Under the elastic force of the return spring 9, the clamping plate 10 will tightly adhere to the surface of the steel pipe to ensure stable clamping of the steel pipe. At the same time, after the steel pipe is removed, the return spring 9 can drive the clamping plate 10 and the telescopic rod 8 to return to the initial position. The inside of the sliding block 35 is slidably connected to the outside of the limiting bracket 2, and the outside of the follower plate 34 is in contact with the outside of the limiting bracket 2. One end of the return spring 9 is fixedly connected to the outside of the gear ring 7, and the other end of the return spring 9 is fixedly connected to the outside of the clamping plate 10.
[0037] Working principle: By starting motor 31, motor 31 drives drive plate 32 to rotate. Drive plate 32 drives follower plate 34 to rotate via connecting shaft 33. Follower plate 34 drives sliding block 35 to slide outside limit bracket 2. Then, sliding block 35 drives two support plates 36 to move, thereby realizing the spacing adjustment of the device.
[0038] By placing the steel pipe inside the clamping plate 10, the clamping plate 10 fixes the steel pipe by the force of the return spring 9. By starting the motor 2 371, the motor 2 371 drives the gear 1 372 to rotate, which in turn enables the gear 1 372 to mesh with the gear ring 7, which in turn enables the gear ring 7 to drive the steel pipe to rotate.
[0039] By starting motor 3 41, motor 3 41 drives eccentric wheel 42 to rotate. Eccentric wheel 42 drives rotating plate 43 to slide. Rotating plate 43 drives mounting plate 45 to slide through sliding plate 44. Then mounting plate 45 can reciprocate to inspect steel pipe through support plate 36.
[0040] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.
Claims
1. A steel pipe centering device for ultrasonic flaw detection of steel pipes, comprising a mounting base plate, characterized in that: Limit brackets are fixedly connected to the top front and rear sides of the mounting base plate, a spacing adjustment mechanism is fixedly connected to the top of the mounting base plate, and a reciprocating pushing mechanism is fixedly connected to the outer left side of the mounting base plate. The spacing adjustment mechanism includes a motor, which is externally fixedly connected to the top of the mounting base plate. A drive plate is fixedly connected to the drive end of the motor. Connecting shafts are fixedly connected to the left and right sides of the drive plate. A follower plate is rotatably connected to the outside of the connecting shaft. A sliding block is rotatably connected to the outside of the follower plate. A support plate is fixedly connected to the top of the sliding block. A drive assembly is fixedly connected to the top of the support plate.
2. The steel pipe centering device for ultrasonic flaw detection of steel pipes according to claim 1, characterized in that: The drive assembly includes a second motor, which is externally fixedly connected to the top of the support plate, and a gear is fixedly connected to the drive end of the second motor.
3. A steel pipe centering device for ultrasonic flaw detection of steel pipes according to claim 1, characterized in that: The reciprocating pushing mechanism includes a motor three, which is externally fixedly connected to the left side of the mounting base plate. An eccentric wheel is fixedly connected to the drive end of the motor three. A rotating plate is rotatably connected to the top of the eccentric wheel. A sliding plate is rotatably connected to the outside of the rotating plate. A mounting plate is fixedly connected to the right side of the sliding plate. Multiple flaw detectors are fixedly connected to the top of the mounting plate.
4. A steel pipe centering device for ultrasonic flaw detection of steel pipes according to claim 2, characterized in that: The top four corners of the support plate are fixedly connected to support rods, and the tops of the two support rods are fixedly connected to mounting brackets.
5. A steel pipe centering device for ultrasonic flaw detection of steel pipes according to claim 4, characterized in that: The mounting bracket is internally rotatably connected to a gear ring, and the outer side of the gear ring is meshed with the outer side of the first gear.
6. A steel pipe centering device for ultrasonic flaw detection of steel pipes according to claim 5, characterized in that: Multiple telescopic rods are fixedly connected inside the gear ring, and a clamping plate is fixedly connected to the other end of each telescopic rod. A return spring is sleeved on the outside of each telescopic rod.
7. A steel pipe centering device for ultrasonic flaw detection of steel pipes according to claim 4, characterized in that: The sliding block is internally slidably connected to the outside of the limiting bracket, and the outside of the follower plate is in contact with the outside of the limiting bracket.
8. A steel pipe centering device for ultrasonic flaw detection of steel pipes according to claim 6, characterized in that: One end of the return spring is fixedly connected to the outside of the gear ring, and the other end of the return spring is fixedly connected to the outside of the clamping plate.