Magnetic flux leakage flaw detector for steel pipe

Abstract

The utility model relates to the technical field of steel pipe magnetic flux leakage flaw detection, and discloses a steel pipe magnetic flux leakage flaw detection machine which comprises a hollow bin and a magnetic flux leakage flaw detector, the magnetic flux leakage flaw detector is fixed in the middle of the top of the hollow bin, and rotating assemblies are arranged on the two sides of the top of the hollow bin. And a positioning clamp is mounted at the top of the rotating end of the rotating assembly. According to the magnetic flux leakage flaw detector for the steel pipes, when the steel pipes with different sizes are detected, the positions of the three universal balls are adjusted through the electric telescopic rods firstly, so that the distance between the rolling ends of the universal balls and the circle center point of the circular ring is equal to the radius of the steel pipes, and adaptive adjustment can be carried out according to the different steel pipes; and the steel pipe is limited by the three universal balls, so that the steel pipe and a detection hole of the magnetic leakage flaw detector are coaxially arranged, the steel pipe is ensured to penetrate through the detection hole of the magnetic leakage flaw detector, the steel pipe is prevented from deviating, the detection effect is ensured, and the detection head is also prevented from being damaged by collision with the steel pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic flux leakage testing for steel pipes, in particular to a magnetic flux leakage testing machine for steel pipes. Background Technique

[0002] An electromagnetic detection method that uses a detection element to detect the magnetic flux leakage field to discover defects, namely magnetic flux leakage testing. When a ferromagnetic steel pipe is fully magnetized, the magnetic force lines in the pipe wall are blocked by defects on its surface or near the surface. The magnetic force lines at the defect sites are distorted, and a part of the magnetic force lines leak out of the inner and outer surfaces of the steel pipe, forming a magnetic flux leakage field. When a detection element located on the surface of the steel pipe and moving relative to the steel pipe picks up the magnetic flux leakage field and converts it into a defect electrical signal, a signal reflecting the defect can be obtained through the probe, so as to judge and process the defect.

[0003] Regarding the existing related technologies, the inventor believes that there are often the following defects: The magnetic flux leakage testing machine can be adapted to perform magnetic flux leakage testing on steel pipes with different diameters within a certain size range. When testing steel pipes of different sizes, it is not conducive to ensuring that steel pipes of different sizes can all pass through the center of the detection hole of the testing machine, that is, whether the steel pipes of different sizes are coaxial with the detection hole of the testing machine. If they are not coaxial, it will affect the detection effect of the testing machine on the steel pipe, and the detection head may touch the steel pipe and cause damage to the detection probe. Content of the Utility Model

[0004] In view of the above problems of the existing magnetic flux leakage testing machine that can be adapted to perform magnetic flux leakage testing on steel pipes with different diameters within a certain size range. When testing steel pipes of different sizes, it is not conducive to ensuring that steel pipes of different sizes can all pass through the center of the detection hole of the testing machine, that is, whether the steel pipes of different sizes are coaxial with the detection hole of the testing machine. If they are not coaxial, it will affect the detection effect of the testing machine on the steel pipe, and the detection head may touch the steel pipe and cause damage to the detection probe, the present utility model is proposed.

[0005] Therefore, the purpose of the present utility model is to provide a magnetic flux leakage testing machine for steel pipes, and its purpose is to ensure that when steel pipes of different sizes pass through the detection hole of the testing machine, the steel pipes of different sizes can all be coaxially arranged with the detection hole of the testing machine.

[0006] To solve the above technical problems, the present utility model provides the following technical solution: A magnetic flux leakage testing machine for steel pipes includes a hollow chamber and a magnetic flux leakage detector. The magnetic flux leakage detector is fixed in the middle of the top of the hollow chamber. Rotating components are arranged on both sides of the top of the hollow chamber, and a positioning fixture is installed on the top of the rotating end of the rotating component.

[0007] The positioning fixture includes a mounting frame. A circular ring is welded to the arc-shaped concave edge at the top of the mounting frame. Three flat ends are arranged at equal intervals on the outer peripheral surface of the circular ring. An electric telescopic rod is installed at the outer end of the flat end. The movable end of the electric telescopic rod is fixedly connected to a lifting block, and a universal ball is installed at the bottom of the lifting block.

[0008] As a preferred solution of the present utility model for a steel pipe magnetic flux leakage detector, wherein: a side connecting convex strip is welded to one side of the lifting block, a connecting block is installed at the top of the side connecting convex strip, the top of the connecting block is in the same plane as the top of the flat end, a scale is adhered to the top of the connecting block, and the top edge of the flat end is a pointer pointing to the scale.

[0009] As a preferred solution of the present utility model for a steel pipe magnetic flux leakage detector, wherein: the center point of the circular ring and the center point of the detection hole of the magnetic flux leakage detector are coaxially arranged.

[0010] As a preferred solution of the present utility model for a steel pipe magnetic flux leakage detector, wherein: the rotating assembly includes a rotating cavity opened on the side of the hollow chamber. An installation shaft is rotatably installed in the rotating cavity through a bearing. A rotating pedestal is sleeved on the outer wall of the installation shaft, and the mounting frame is fixed on the top of the rotating pedestal.

[0011] As a preferred solution of the present utility model for a steel pipe magnetic flux leakage detector, wherein: the rotating assembly further includes a driving motor installed inside the hollow chamber. A belt transmission assembly is installed between the driving end of the driving motor and the installation shaft.

[0012] As a preferred solution of the present utility model for a steel pipe magnetic flux leakage detector, wherein: installation cavities are opened on both sides of the hollow chamber. A movable rod is installed in the installation cavity through a drawer slide rail. A bearing strip is installed between the outer sides of the two movable rods on the same side.

[0013] As a preferred solution of the present utility model for a steel pipe magnetic flux leakage detector, wherein: the top of the bearing strip is in the same plane as the top of the hollow chamber.

[0014] As a preferred solution of the present utility model for a steel pipe magnetic flux leakage detector, wherein: a rubber strip is adhered to the top of the bearing strip, and a handle frame is installed on the side of the bearing strip away from the hollow chamber.

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

[0016] 1. In the present utility model, when detecting steel pipes of different sizes, the positions of the three universal balls are first adjusted by the electric telescopic rod so that the distance between the rolling ends of the universal balls and the center point of the ring is equal to the radius of the steel pipe. It can be adjusted adaptively according to different steel pipes, and the three universal balls limit the steel pipe, so that the steel pipe and the detection hole of the magnetic flux leakage detector are coaxially arranged, ensuring that the steel pipe passes through the detection hole of the magnetic flux leakage detector exactly in the middle, avoiding the deviation of the steel pipe and ensuring the detection effect, and also avoiding the collision and damage between the detection head and the steel pipe.

[0017] 2. In the present utility model, when adjusting the universal balls by the electric telescopic rod, the scale also moves with the universal balls, and the indication of the scale represents the diameter of the clamped steel pipe. According to the indication of the scale, the position of the universal balls can be quickly and accurately adjusted, which is convenient and fast to adjust.

[0018] 3. In the present utility model, when the magnetic flux leakage detector needs to be repaired, the drive motor drives the belt drive assembly to drive the installation shaft to rotate, and the positioning fixture is rotated in the direction away from the magnetic flux leakage detector, so that the positioning fixture changes from a vertical placement to a horizontal placement, thus avoiding the two-sided positioning fixtures from blocking the two sides of the magnetic flux leakage detector, leaving more space around the magnetic flux leakage detector for more convenient related operations on the magnetic flux leakage detector. When the positioning fixture is in a flat position, the bearing bar is pulled outward so that the positioning fixture is placed on the top of the bearing bar, supporting the positioning fixture to improve the stability of the positioning fixture when it is in a flat position. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0020] Figure 1 It is a schematic diagram of the overall structure of a steel pipe magnetic flux leakage detector of the present utility model.

[0021] Figure 2 It is a schematic diagram of the structure of the positioning fixture of a steel pipe magnetic flux leakage detector of the present utility model.

[0022] Figure 3 It is a schematic plan view of the ring of a steel pipe magnetic flux leakage detector of the present utility model.

[0023] Figure 4 It is a schematic diagram of the structure of the rotating assembly of a steel pipe magnetic flux leakage detector of the present utility model.

[0024] DESCRIPTION OF THE REFERENCE NUMERALS:

[0025] 1. Hollow bin; 2. Magnetic flux leakage detector; 3. Rotating assembly; 31. Rotating cavity; 32. Rotating pedestal; 33. Mounting shaft; 34. Mounting cavity; 35. Movable rod; 36. Bearing strip; 37. Driving motor; 38. Belt drive assembly; 4. Positioning fixture; 41. Mounting frame; 42. Ring; 43. Flat end; 44. Electric telescopic rod; 45. Lifting block; 46. Universal ball; 47. Side connecting rib; 48. Scale; 49. Connecting block. Detailed implementation manners

[0026] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present utility model in conjunction with the drawings of the specification.

[0027] Embodiment 1

[0028] Referring to Figures 1-4 , which is the first embodiment of the present utility model, a magnetic flux leakage detector for steel pipes is provided. Such a magnetic flux leakage detector for steel pipes includes a hollow bin 1 and a magnetic flux leakage detector 2. The magnetic flux leakage detector 2 is fixed in the middle of the top of the hollow bin 1. Rotating assemblies 3 are arranged on both sides of the top of the hollow bin 1. A positioning fixture 4 is installed on the top of the rotating end of the rotating assembly 3;

[0029] The positioning fixture 4 includes a mounting frame 41. A ring 42 is welded to the arc-shaped concave edge at the top of the mounting frame 41. Three flat ends 43 are arranged at equal intervals on the outer peripheral surface of the ring 42. An electric telescopic rod 44 is installed at the outer end of the flat end 43, and the movable end of the electric telescopic rod 44 is located inside the ring 42. The movable end of the electric telescopic rod 44 is fixedly connected to a lifting block 45, and a universal ball 46 is installed at the bottom of the lifting block 45.

[0030] When detecting steel pipes of different sizes, first adjust the positions of the three universal balls 46 through the electric telescopic rod 44 so that the distance between the rolling ends of the universal balls 46 and the center point of the ring 42 is equal to the radius of the steel pipe. It can be adjusted adaptively according to different steel pipes, and the three universal balls 46 limit the steel pipe, so that the steel pipe and the detection hole of the magnetic flux leakage detector 2 are coaxially arranged, ensuring that the steel pipe passes through the detection hole of the magnetic flux leakage detector 2 exactly in the middle, avoiding the deviation of the steel pipe and ensuring the detection effect, and also avoiding the collision and damage between the detection head and the steel pipe.

[0031] A side connecting convex strip 47 is welded to one side of the lifting block 45, and a connecting block 49 is installed on the top of the side connecting convex strip 47, and a through groove for the connecting block 49 to pass through is opened at the top of the plane end 43, and the top of the connecting block 49 and the top of the plane end 43 are on the same plane, and a scale 48 is bonded to the top of the connecting block 49, and the front of the scale 48 is provided with a pipe diameter indication value, and the top edge of the plane end 43 is a pointer pointing to the scale 48. When the universal ball 46 is adjusted by the electric telescopic rod 44, the scale 48 also moves with the universal ball 46, and the indication of the scale 48 represents the diameter of the clamped steel pipe. According to the indication of the scale 48, the position of the universal ball 46 can be quickly and accurately adjusted, and the adjustment is convenient and quick.

[0032] The center point of the circular ring 42 and the center point of the detection hole of the magnetic flux leakage flaw detector 2 are coaxially arranged.

[0033] During use, the distance between the three universal balls 46 and the center point of the ring 42 is adaptively adjusted according to the size of the detected steel pipe, and the electric telescopic rod 44 is extended and retracted to drive the lifting block 45 to move, so as to adjust the distance between the rolling end face of the universal ball 46 and the center point of the ring 42, and adjust the distance between the rolling end of the universal ball 46 and the center point of the ring 42 to the distance of the steel pipe. The three universal balls 46 and the three points of the outer wall of the steel pipe are limited and supported, so that when the pipeline passes through the leakage magnetic flaw detector 2 for inspection, the position of the steel pipe is first limited by the three universal balls 46, so that the steel pipe and the ring 42 are in a coaxial state, and the ring 42 Since the detection hole of the magnetic flux leakage flaw detector 2 is in a coaxial state, the steel pipe and the detection hole are in a coaxial state at this time. When testing steel pipes of different sizes, the positions of the three universal balls 46 are first adjusted by the electric telescopic rod 44 so that the distance between the rolling end of the universal ball 46 and the center point of the ring 42 is equal to the radius of the steel pipe. The adaptability can be adjusted according to different steel pipes, and the three universal balls 46 limit the steel pipe so that the steel pipe and the detection hole of the magnetic flux leakage flaw detector 2 are in a coaxial setting, ensuring that the steel pipe is in the middle and passes through the detection hole of the magnetic flux leakage flaw detector 2, avoiding the deviation of the steel pipe to ensure the detection effect, and also avoiding the collision and damage of the detection head and the steel pipe.

[0034] Example 2

[0035] Reference Figures 1-4 , which is the second embodiment of the utility model, and this embodiment is different from the first embodiment in that:

[0036] The rotating assembly 3 includes a rotating chamber 31 opened on the side of the hollow chamber 1. A mounting shaft 33 is rotatably mounted inside the rotating chamber 31 via a bearing. A rotating pedestal 32 is sleeved on the outer wall of the mounting shaft 33, and a mounting frame 41 is fixed on the top of the rotating pedestal 32.

[0037] The rotating assembly 3 further includes a driving motor 37 installed inside the hollow bin 1. A belt drive assembly 38 is installed between the driving end of the driving motor 37 and the mounting shaft 33. The belt drive assembly 38 consists of two synchronous pulleys and a synchronous belt installed between the two synchronous pulleys.

[0038] When the magnetic flux leakage detector 2 needs to be repaired, the driving motor 37 drives the belt drive assembly 38 to drive the mounting shaft 33 to rotate, and rotates the positioning fixture 4 in the direction away from the magnetic flux leakage detector 2, so that the positioning fixture 4 changes from a vertical placement to a horizontal placement, thus preventing the positioning fixtures 4 on both sides from blocking the magnetic flux leakage detector 2 from both sides, and creating space around the magnetic flux leakage detector 2 to facilitate related operations on the magnetic flux leakage detector 2.

[0039] Installation cavities 34 are provided on both sides of the hollow bin 1. Inside the installation cavities 34, movable rods 35 are installed through drawer slides, and a bearing bar 36 is installed between the outer sides of the two movable rods 35 on the same side.

[0040] The top of the bearing bar 36 is on the same plane as the top of the hollow bin 1. When the positioning fixture 4 is placed flat, the bearing bar 36 is pulled outward, so that the positioning fixture 4 is placed on the top of the bearing bar 36, supporting the positioning fixture 4 to improve the stability of the positioning fixture 4 when it is placed flat.

[0041] A rubber strip is bonded to the top of the bearing bar 36, and a handle holder is installed on the side of the bearing bar 36 away from the hollow bin 1. The rubber strip plays a buffering role when contacting the positioning fixture 4.

[0042] During use, when the magnetic flux leakage detector 2 needs to be repaired, the driving motor 37 drives the belt drive assembly 38 to drive the mounting shaft 33 to rotate, and rotates the positioning fixture 4 in the direction away from the magnetic flux leakage detector 2, so that the positioning fixture 4 changes from a vertical placement to a horizontal placement, thus preventing the positioning fixtures 4 on both sides from blocking the magnetic flux leakage detector 2 from both sides, and creating space around the magnetic flux leakage detector 2 to facilitate related operations on the magnetic flux leakage detector 2.

[0043] The remaining structure is the same as that of Embodiment 1.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A magnetic flux leakage flaw detector for steel pipes, comprising a hollow chamber (1) and a magnetic flux leakage flaw detector (2), characterized in that: The magnetic flux leakage flaw detector (2) is fixed to the middle of the top of the hollow chamber (1), and rotating components (3) are arranged on both sides of the top of the hollow chamber (1), and a positioning fixture (4) is installed on the top of the rotating end of the rotating component (3); The positioning fixture (4) comprises a mounting frame (41), a circular ring (42) is welded to the arc-shaped concave edge at the top of the mounting frame (41), three plane ends (43) are arranged at equal intervals on the outer peripheral surface of the circular ring (42), an electric telescopic rod (44) is installed at the outer end of the plane end (43), a lifting block (45) is fixedly connected to the movable end of the electric telescopic rod (44), and a universal ball (46) is installed at the bottom of the lifting block (45).

2. The magnetic flux leakage flaw detector for steel pipe according to claim 1, characterized in that: A side connecting convex strip (47) is welded to one side of the lifting block (45), a connecting block (49) is installed on the top of the side connecting convex strip (47), the top of the connecting block (49) and the top of the plane end (43) are on the same plane, a scale (48) is bonded to the top of the connecting block (49), and the top edge of the plane end (43) is a pointer pointing to the scale (48).

3. A magnetic flux leakage flaw detector for steel pipes according to claim 2, characterized in that: The center point of the circular ring (42) and the center point of the detection hole of the magnetic flux leakage flaw detector (2) are coaxially arranged.

4. The magnetic flux leakage flaw detector for steel pipe according to claim 3, characterized in that: The rotating assembly (3) comprises a rotating chamber (31) opened on the side of the hollow chamber (1), a mounting shaft (33) is rotatably mounted inside the rotating chamber (31) via a bearing, a rotating pedestal (32) is sleeved on the outer wall of the mounting shaft (33), and a mounting frame (41) is fixed on the top of the rotating pedestal (32).

5. The magnetic flux leakage flaw detector for steel pipe according to claim 4, characterized in that: The rotating assembly (3) further comprises a driving motor (37) installed inside the hollow chamber (1), and a belt transmission assembly (38) is installed between the driving end of the driving motor (37) and the mounting shaft (33).

6. The magnetic flux leakage flaw detector for steel pipe according to claim 5, characterized in that: Both sides of the hollow warehouse (1) are provided with installation cavities (34), and movable rods (35) are installed inside the installation cavities (34) through drawer slide rails. A bearing bar (36) is installed between the outer sides of two movable rods (35) on the same side.

7. A magnetic flux leakage flaw detector for steel pipes according to claim 6, characterized in that: The top of the bearing bar (36) and the top of the hollow bin (1) are on the same plane.

8. The magnetic flux leakage flaw detector for steel pipe according to claim 7, characterized in that: A rubber strip is bonded to the top of the bearing strip (36), and a handle frame is installed on the side of the bearing strip (36) away from the hollow chamber (1).

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