Magnetic particle flaw detector for pipe

Abstract

The utility model discloses a kind of magnetic particle flaw detection devices for pipe fittings, mainly related to magnetic particle detection field. Including the top frame of being located above pipe fitting and being horizontally arranged, the length direction of the opposite roof beam of both ends of top frame has the stroke frame of reverse telescopic stroke, the outer end of the stroke frame away from each other is fixed with the downward extension of vertical frame, the bottom of vertical frame is fixed with frame type frame, the side of frame type frame away from vertical frame is equipped with supporting wheel, the supporting wheel spacing of both sides is less than vertical frame spacing, detection head for magnetic particle detection is equipped below top frame. The utility model has the beneficial effect that it can detect large size pipe fittings in the state based on mechanical lifting, facilitate pipe fitting rotation, make observation field of view more convenient and clear.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of magnetic particle detection, and specifically relates to a magnetic particle flaw detection device for pipe fittings. BACKGROUND

[0002] Magnetic particle testing (MT) is very useful for welded joints, which is a non-destructive testing method that can effectively detect surface and near-surface defects in welded joints. Whether it is a straight weld or a complex shape weld, effective detection can be achieved by adjusting the magnetization method and equipment. The defects that can be detected include cracks, incomplete fusion, incomplete penetration, pores, slag inclusion, etc. Especially for large welded structures such as pipelines, pressure vessels, etc., magnetic particle testing can be quickly performed on site to timely detect welding defects, thereby reducing rework time and cost.

[0003] However, when performing magnetic particle testing on large-diameter pipeline welding, the inspector needs to spray magnetic powder and hold the detection machine along the weld for detection. It is very time-consuming and labor-intensive, and requires high physical strength. When performing magnetic particle testing on the bottom surface (especially the lower surface of large pipe fittings or structural parts), there may be situations of observation not in place or difficulty in inspection due to limited field of view, insufficient light, etc. This makes the detection need to lift the pipe fitting or turn over the pipe fitting, especially for large pipe fittings, combined with lifting equipment, or with related tools (telescopic rod, mirror, light source, etc.). Not only is it more complicated and labor-intensive, but there are also safety hazards during the movement of the pipe fitting and the operation of the bottom exploration. SUMMARY

[0004] The utility model aims at providing a magnetic particle flaw detection device for pipe fittings, which can detect large-size pipe fittings in a state of being lifted by a machine, facilitate the rotation of the pipe fitting, and make the observation field of view more convenient and clear.

[0005] The utility model realizes the above-mentioned purpose by the following technical scheme:

[0006] A magnetic particle flaw detection device for pipe fittings, comprising a top frame arranged horizontally above the pipe fitting, two ends of the top frame are respectively provided with stroke frames having reverse telescopic strokes in the length direction of the top beam, the outer ends of the stroke frames away from each other are fixed with downward extending vertical frames, the bottom ends of the vertical frames are fixed with frame type frames, one side of the frame type frame away from the vertical frame is provided with a supporting wheel, the distance between the two supporting wheels is less than the distance between the vertical frames, and a detection head for magnetic particle testing is arranged below the top frame.

[0007] The top frame is a lifting frame based on lifting installation, or the top frame adopts a self-supporting door type frame structure.

[0008] The top frame comprises two top beams arranged side by side, the middle part of the top beam is fixed with a plurality of cross beams, the two ends of the top beam are respectively fixed with downward arranged side beams, and the side beams and the top frame form a door-shaped frame.

[0009] A gear is rotatably arranged at the center of the top frame, the two sides of the gear are respectively provided with a first rack and a second rack, the inner sides of the first rack and the second rack are respectively engaged with the gear, the first rack and the second rack are arranged in parallel with respect to the top beam, the first rack and the second rack extend in opposite directions, the first rack and the second rack are respectively fixed on two stroke frames, the outer end of the stroke frame is provided with a mounting seat, and the mounting seat is used for being fixed with the upper part of the stand.

[0010] The top end of the stand is provided with a strip-shaped hole extending in the height direction, the mounting seat is provided with two threaded sleeves arranged in the up-down direction, the threaded sleeves are threadedly connected with lock nuts, and the stand is fixed on the mounting seat through the lock nuts penetrating the strip-shaped hole and being adjustable in height.

[0011] The middle part of the top frame is provided with two vertically extending sliding sleeves, the sliding sleeves are symmetrically arranged with respect to the gear, the sliding sleeves are provided with sliding rods, and the bottom ends of the sliding rods are fixed with detection heads.

[0012] The top frame is provided with a powder box and a spray pipe, the spray pipe is provided with a spray head at the tail end, the spray pipe is connected with the powder box, the spray pipe is a snake pipe, and the spray head is arranged at the middle position below the top frame.

[0013] One side of the door-shaped frame is provided with a vertical plate fixed with respect to the side beam, the bottom of the vertical plate is hingedly connected with a swing rod, and one end of the swing rod close to the middle part of the top frame is rotatably arranged with a friction wheel.

[0014] The two ends of the swing rod are rotatably arranged with pulleys, the pulleys are wound with a belt, the pulley at one end is coaxially fixed with the friction wheel, the pulley at the other end is driven to rotate based on a motor, a spring piece is arranged between the top end of the swing rod and the upper part of the vertical plate, and the spring piece has an elastic force for pulling the top end of the swing rod upward.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows:

[0016] When the device is used to detect large-size pipe fittings, the pipe material bottom peripheral surface can be matched with the pipe fitting by the mutual approach of the supporting wheels, so that the pipe fitting bottom peripheral surface falls on the supporting wheels, the pipe fitting is conveniently rotated, the welds can be exposed in the upper field of view based on the rotation, personnel is not needed to explore the bottom, the safety of detection is improved. Meanwhile, the observation area is located in the upper area and is inconvenient, which not only saves labor and is convenient, but also provides a better field of view for detection and observation, and is beneficial to improve the data accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the overall schematic view of the present application.

[0018] Figure 2 is the Figure 1 enlarged view of F part of the present application.

[0019] Figure 3 is the top view of the present application.

[0020] Figure 4 is the side view of the present application in use state.

[0021] Figure 5 is the right side schematic view of the present application. Figure 4

[0022] Figure 6 is the schematic view of the present application in use state.

[0023] Reference signs shown in the drawings:

[0024] 1, roof beam; 2, cross beam; 3, side beam; 4, gear; 5, first rack; 6, second rack; 7, stroke frame; 8, light pole guide rail; 9, mounting seat; 10, stand; 11, strip hole; 12, frame; 13, supporting wheel; 14, sliding sleeve; 15, sliding rod; 16, support frame; 17, vertical rod; 18, mounting block; 19, cutting groove; 20, vertical plate; 21, swing rod; 22, pulley; 23, friction wheel; 24, belt; 25, sliding seat; 26, spring piece. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not used to limit the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various changes or modifications to the present application, and these equivalent forms also fall within the scope defined by the present application.

[0026] Embodiment:

[0027] The present equipment is mainly aimed at the weld detection of large pipe fittings, and the main body structure comprises:

[0028] ​A self-supporting portal frame is provided, comprising an I-shaped top frame at the top, and two horizontally arranged top beams 1. Multiple crossbeams 2 are fixed in the middle of the top beams 1, fixing the two top beams 1 as a whole. The crossbeams 2 are concentrated and fixed in the middle of the two top beams 1. In this example, three crossbeams 2 are welded and fixed at equal intervals in the center. However, this example is not limited to this one and one or other numbers can also be used. The crossbeams 2 and the top beams 1 form an I-shaped top frame structure. In addition to the crossbeams 2 connecting in the middle, the two ends of the top beams 1 are open structures to facilitate the movement of components.

[0029] The top beam 1 has downwardly extending side beams 3 welded and fixed at both ends. The bottom ends of the side beams 3 are inclined outward, so that the two side beams 3 located at the same end of the top beam 1 form a trapezoidal structure, which makes the support more stable.

[0030] This portal frame provides self-support and, based on its overall structure, allows for straddling of pipe fittings. Casters can be installed at the bottom of side beam 3, depending on the equipment size. If the diameter of the pipe fitting being tested is less than 1 meter, a caster-less structure can be used. This simplifies components, reduces costs, and provides more stable support, preventing easy movement. In practical use, given the relatively small size of the entire device, it can be simply lifted and straddled over the pipe fitting being tested. This is especially convenient and quick for long, welded pipe fittings. If the diameter of the pipe fitting being tested is greater than 0.8 meters, the entire device needs to be proportionally scaled up. Casters with a self-locking mechanism can be installed at the bottom of side beam 3, allowing the portal frame to gradually move from one end of the pipe fitting to the welding position, saving effort and ensuring safety.

[0031] The top frame is provided with travel frames 7 at both ends, which have opposite extension and retraction strokes relative to the length direction of the top beam 1. Each travel frame 7 includes two parallel guide rails 8. The top frame is fixed with a slide block 25 that is slidably connected to the guide rail. There are two slide blocks 25. The travel frame 7 on the same side passes through the slide block 25 on that side and slides horizontally with the slide block 25. The travel frames 7 are offset relative to the width direction of the top frame to facilitate mutual travel.

[0032] A rotating seat is fixed in the center of the top frame (located in the center of the crossbeam 2). This rotating seat can be a bearing housing. A gear 4 is rotatably mounted above the rotating seat. A stroke motor is mounted below the crossbeam 2, and the output shaft of the stroke motor is connected to the gear 4, driving its rotation. Not limited to this example, for smaller devices where cost is a primary concern, a handwheel can be installed on the axle of the gear 4, allowing manual rotation of the gear 4 to achieve the same function.

[0033] Two sides of the gear 4 are respectively provided with a first rack 5 and a second rack 6, inner sides of the first rack 5 and the second rack 6 are respectively engaged with the gear 4, the first rack 5 and the second rack 6 are arranged in parallel with respect to the roof beam 1, and the first rack 5 and the second rack 6 extend reversely. The first rack 5 and the second rack 6 are respectively fixed on two stroke frames 7, and the stroke frames 7 on two sides are driven by the gear 4 to realize reverse telescopic linear displacement.

[0034] An outer end of the stroke frame 7 is provided with a mounting seat 9, the mounting seat 9 is a T-shaped structure, two ends of the top frame are also respectively provided with an upright stand 10 arranged upright, a top end of the upright stand 10 is provided with a strip-shaped hole 11 extending in the height direction, the mounting seat 9 is provided with two threaded sleeves in the up-down direction, the threaded sleeves are threadedly connected with locking nuts, the upright stand 10 is fixed on the mounting seat 9 through the locking nuts penetrating the strip-shaped hole 11 in a height-adjustable manner, so that the caliber range of the pipe fitting that can be adapted is further expanded. Not limited to the example, the structure of the strip-shaped hole 11 can also be omitted, and the top end of the upright stand 10 is directly fixed on the mounting seat 9 through a bolt, and the direct fixing mode can improve the fixing effect.

[0035] A bottom end of the upright stand 10 is fixed with a frame 12, a side of the frame 12 away from the upright stand 10 is provided with a supporting wheel 13, the frame 12 can be inclined to extend, that is, bottom sides of the frames 12 on two sides are relatively close to each other, so as to adapt to the bottom curved surface of the pipe fitting and make the supporting wheel 13 more closely fit the bottom of the pipe fitting. The frame 12 can also horizontally extend, and the side provided with the supporting wheel 13 is the adjacent inner side.

[0036] Based on the above structure, the frames 12 on two sides can have reverse strokes of relative closing or separation with the stroke frame 7, when the frames 12 on two sides are relatively close to each other, the supporting wheel 13 cooperates with the bottom of the pipe fitting, and the pipe fitting can be lifted when the supporting wheel 13 continues to close after contacting the circumferential surface of the pipe fitting, and the circumferential surface of the bottom of the pipe fitting falls on the supporting wheel 13, facilitating rotation. At this time, the weld is sprayed with magnetic powder and detected, and the pipe fitting can be easily rotated, and the person does not move, so that the circumferential side of the weld is gradually rotated to one turn to easily complete the detection. When the frames 12 on two sides slowly separate, the pipe fitting can be gradually loosened and falls to the ground. The whole process is labor-saving, efficient and safe, and the pipe fitting can be quickly and conveniently lifted off the ground.

[0037] For convenient operation, the handheld detector can also be integrated on the top frame. A sliding sleeve 14 extending upward and downward is fixed on the middle beam 2 of the top frame. The sliding sleeve 14 is provided with a sliding rod 15. The bottom end of the sliding rod 15 is provided with a detection head, which can be a door-shaped detection head (similar to the structure of the existing handheld detector). Based on the structure of the middle lifting, it can cooperate with different sizes of pipes for detection. Through the self-weight or manual holding pressure, the detection head is pressed on the top surface of the pipe. Based on the fact that the device is ridden on the welding seam during use, the two detection heads are respectively on both sides of the welding seam, so that the detection can be easily performed.

[0038] The top end of the sliding rod 15 can be provided with a stop block, so that the detection head is integrated with the device. A non-shielding structure can also be used, which can be directly taken out by sliding downward, and is convenient and flexible to use.

[0039] A powder box and a spray pipe can also be installed on the top frame. The spray pipe is provided with a spray head at the end. The spray pipe is connected with the powder box and automatically sprays the magnetic powder through the switch control and pump control. The spray head is arranged above the two detection heads. The spray pipe can be a flexible pipe, which can be bent and self-supported, freeing the hands of the detection personnel, and a single person can complete the detection. It is labor-saving and efficient.

[0040] Further, a support frame 16 is fixed on one side of the side beam 3. A vertical stand 17 is fixed on the support frame 16. A mounting block 18 is sleeved on the stand 17. An installation hole corresponding to the stand 17 is vertically penetrated in the mounting block 18. A cut groove 19 is arranged on one side of the mounting block 18 and communicates with the installation hole. Double-end bolts horizontally penetrating the mounting block 18 and screwing are arranged on both sides of the cut groove 19. Nuts are arranged at both ends of the double-end bolts to lock and fix the mounting block 18 on the stand 17 at a height, realizing height-adjustable fixing.

[0041] A vertical plate 20 is fixed on the mounting block 18. A swing rod 21 is hingedly connected to the bottom of the vertical plate 20. Two rotating wheels 22 are rotatably arranged at both ends of the swing rod 21. A belt 24 is wound between the two rotating wheels 22, realizing transmission of the two rotating wheels 22. A rotating motor is arranged at the outer end of the swing rod 21 and drives the rotating wheel 22 at the same end. A friction wheel 23 coaxially fixed with the rotating wheel 22 at the same end is arranged at the inner end of the swing rod 21. The circumferential surface of the friction wheel 23 falls on the surface of the pipe. The rotation of the friction wheel 23 can drive the pipe to rotate slowly, thereby realizing labor-saving and uniform-speed rotation control of the pipe. A spring 26 can be arranged between the top end of the swing rod 21 and the upper part of the vertical plate 20. The spring 26 has an elastic force to pull the top end of the swing rod 21 upward, so that the inner end of the swing rod 21 is pressed downward on the surface of the pipe.

[0042] When the weld position of the large pipe is detected by the device, the device can be pushed or moved to straddle the outside of the pipe, and the weld is located at the central position below the top frame. After fixing the position of the device, the two side supporting wheels 13 are moved towards the middle until the pipe is lifted off the ground (no need to lift high, 5 cm off the ground is enough, if you want to place a water tank below to collect magnetic powder, the height should be slightly higher than the water tank, a water tank with a depth of 10 cm is recommended, the lifting height is 15 cm);

[0043] Under the condition of higher configuration of the device, the drop detection head is in contact with the top surface of the pipe, and the contact position is on both sides of the weld. The friction wheel 23 is pressed on the pipe wall, and the magnetic powder is automatically sprayed on the weld below. The operator mainly pays attention to the compression of the detection head and the situation of the weld between the detection heads.

[0044] Therefore, through the improvement of the structure of the device, the dangerous operation of manual lifting and turning of the pipe is replaced by mechanical operation, and the personnel do not need to probe the bottom, which improves the safety of detection. At the same time, the observation area is located in the upper area and is inconvenient, which not only saves labor and is convenient, but also provides a better view for detection and observation, which is conducive to improving the data accuracy.

Claims

1. A magnetic particle inspection device for pipe fittings, characterized in that, The device includes a top frame positioned horizontally above the pipe fitting. At both ends of the top frame are travel frames with opposite extension strokes relative to the length of the top beam. The outer ends of the travel frames, which are far apart from each other, are fixed with downward-extending uprights. The bottom end of the uprights is fixed with a frame-shaped frame. The side of the frame-shaped frame away from the uprights is provided with a support roller. The distance between the support rollers on both sides is less than the distance between the uprights. A detection head for magnetic particle testing is provided below the top frame.

2. The magnetic particle inspection device for pipe fittings according to claim 1, characterized in that, The top frame is a hoisting frame based on hoisting installation, or the top frame adopts a self-supporting portal frame structure.

3. The magnetic particle inspection device for pipe fittings according to claim 2, characterized in that, The top frame includes two top beams arranged side by side, with multiple crossbeams fixed in the middle of the top beams, and downward-facing side beams fixed at both ends of the top beams. The side beams and the top frame form a portal frame.

4. The magnetic particle inspection device for pipe fittings according to claim 1, characterized in that, A gear is rotatably mounted in the center of the top frame. A first rack and a second rack are respectively provided on both sides of the gear. The inner sides of the first rack and the second rack mesh with the gear. The first rack and the second rack are arranged parallel to the top beam and extend in opposite directions. The first rack and the second rack are respectively fixed on two travel frames. The outer end of the travel frame is provided with a mounting seat, which is used to fix it to the upper part of the upright frame.

5. The magnetic particle inspection device for pipe fittings according to claim 4, characterized in that, The top of the stand is provided with a strip-shaped hole extending along the height direction. The mounting base is provided with two threaded sleeves, one above the other. A locking nut is threaded into the inner thread of the threaded sleeve. The locking nut passes through the strip-shaped hole to fix the top of the stand to the mounting base in an adjustable height.

6. The magnetic particle inspection device for pipe fittings according to claim 1, characterized in that, The top frame has two vertically extending sliding sleeves in the middle, which are symmetrically arranged relative to the gear. The sliding sleeves are equipped with sliding rods, and the bottom end of the sliding rods is fixed to the detection head.

7. The magnetic particle inspection device for pipe fittings according to claim 1, characterized in that, The top frame is equipped with a powder box and a spray pipe. The end of the spray pipe is equipped with a nozzle. The spray pipe is connected to the powder box. The spray pipe is a snake-shaped tube. The nozzle is located in the middle position below the top frame.

8. The magnetic particle inspection device for pipe fittings according to claim 1, characterized in that, One side of the portal frame is provided with an upright plate fixed to the opposite side beam. The bottom of the upright plate is hinged to a swing rod, and a friction wheel is rotatably installed at one end of the swing rod near the middle of the top frame.

9. The magnetic particle inspection device for pipe fittings according to claim 8, characterized in that, The swing rod has pulleys rotatably mounted at both ends, and a belt is wound between the pulleys. One pulley is fixed coaxially with the friction wheel, and the other pulley rotates based on the motor drive. A spring is provided between the top of the swing rod and the upper part of the upright plate, and the spring has an elastic force that pulls the top of the swing rod upward.

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