Magnetic particle testing apparatus

Abstract

To provide a magnetic particle flaw detector capable of certainly eliminating the liquid sump of an inspection liquid without using a hand-held blower or blowing breath and to provide an operation mechanism capable of certainly performing the sliding in the longitudinal direction of a blower nozzle or the shaking of an inspection liquid scattering nozzle.SOLUTION: The magnetic-particle inspection apparatus includes a truck having a frame and three or more wheels, a magnar, an euler, a black light, and the like, wherein an inspection liquid spray nozzle 12N and a blower 13 are installed in a lower portion of the frame, the inspection liquid spray nozzle 12N can be swung around a vertical axis within a predetermined angle range by a swing mechanism, and the blower 13 can be slid in a predetermined operation range in a front-rear direction of the truck by a slide mechanism.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a blower and a test liquid spray nozzle of a magnetic particle flaw detection device that magnetizes a magnetic test object such as a steel plate or a butt weld using a magnetizer, sprays a test liquid containing magnetic particles on the surface of the magnetized test object, and detects defects present in the test object from the magnetic particle pattern formed on the test object surface. [Background technology]

[0002] Magnetic particle testing involves contacting the magnetic poles of an electromagnet in a magnetizer with the test object, passing current through the magnetic poles to magnetize the test object, then spraying a test liquid containing magnetic particles onto the test object's surface, shining a black light on the area where the magnetic particles have been sprayed, and having an inspector observe the magnetic particle pattern that appears on the test object's surface. This work is laborious, as the inspector must repeatedly observe while crouching with their head down and moving and operating inspection equipment such as the magnetizer, test liquid sprayer, and black light. Furthermore, after spraying the test liquid on the test object's surface, they must use a handheld blower or blow on the test liquid to remove any pools of test liquid, which reduces work efficiency and increases the inspection time.

[0003] Therefore, in order to improve the efficiency of magnetic particle inspection work, the applicant has invented and obtained a patent for a magnetic particle inspection device that includes a frame consisting of a chassis part (1) and a support part (2), a cart (4) with four wheels (3), a magnar (5), an oiler (6), a blower (7), a black light (8), and a camera (9) (Patent Document 1: JP 2021-32612 A (Patent Publication No. 6440892 A)). The blower (7) of the magnetic particle flaw detector according to this patent invention can control the flow rate of the test liquid containing magnetic particles by blowing air from the air outlet (13) onto the surface of the specimen onto which the test liquid has been sprayed, and the air outlet (13) has excellent functions such as being able to manually adjust the angle of incidence of the air and having a swivel device that allows it to swivel left and right (see, in particular, paragraph 0017 and Figure 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-32612 A (Patent No. 6832398 A) Summary of the Invention [Problem to be solved by the invention]

[0005] However, the magnetic particle flaw detector described in Patent Document 1 performs flaw detection work with the carriage (4) stopped, so even if the incident angle of the air blown from the air outlet (13) is manually adjusted or the air outlet (13) is swung left and right using a swinging device, the air outlet (13) cannot be moved forward and backward (in the direction of travel of the carriage). Therefore, if adjusting the incident angle or swinging the air outlet (13) does not eliminate the puddle of test liquid, the inspector is forced to use a handheld blower or blow on the test liquid to eliminate the puddle, which reduces work efficiency and takes a long time for the inspection. The first object of the present invention is to solve these problems and provide a magnetic particle flaw detector that can reliably eliminate pools of test liquid without using a handheld blower or blowing. The second object is to provide an operating mechanism that reliably slides the air blowing nozzle back and forth and swings the test liquid spray nozzle. [Means for solving the problem]

[0006] The invention according to claim 1 is a magnetic particle inspection device comprising a frame, a carriage having three or more wheels, a Magnar, an Euler, and a black light, A blower including a blower for blowing air and a blowing nozzle for blowing the air blown from the blower onto the flaw detection area is installed at the bottom of the frame, The vehicle is characterized by including a sliding mechanism that slides at least the air blowing nozzle in the front-to-rear direction of the carriage.

[0007] The invention according to claim 2 is the magnetic particle flaw detector according to claim 1, A flexible pipe and a test liquid spray nozzle for sending the test liquid from the oiler are installed at the bottom of the frame, The test liquid spray nozzle is characterized by having a swinging mechanism that swings the test liquid spray nozzle around a vertical axis within a predetermined angle range.

[0008] The invention according to claim 3 is the magnetic particle flaw detector according to claim 1 or 2, the sliding mechanism includes a sliding motor and a sliding conversion mechanism that converts the rotational motion of the sliding motor into linear motion; The swing mechanism is characterized by comprising a swing motor and a swing conversion mechanism that converts the rotational motion of the swing motor into swing motion. [Effects of the Invention]

[0009] According to the invention of claim 1, a blower consisting of a blower that blows air and an air blowing nozzle that blows the air from the blower onto the inspection area is installed at the bottom of the frame, and a sliding mechanism is provided that slides at least the air blowing nozzle in the forward and backward directions of the cart, so it is possible to provide a magnetic particle inspection device that can reliably eliminate pools of test liquid without using a handheld blower or blowing air onto the test liquid.

[0010] According to the invention of claim 2, in addition to the effects of the invention of claim 1, a flexible tube for sending test liquid from the oiler and a test liquid spray nozzle are installed at the bottom of the frame, and a swinging mechanism is provided for swinging the test liquid spray nozzle around a vertical axis within a predetermined angle range, so that the test liquid can be easily sprayed over the entire inspection area of ​​the specimen.

[0011] According to the invention of claim 3, in addition to the effects of the invention of claim 1 or 2, the sliding mechanism that slides the air blowing nozzle in the forward and backward directions of the cart consists of a sliding motor and a sliding conversion mechanism that converts the rotational motion of the sliding motor into linear motion, and the swinging mechanism that swings the test liquid spraying nozzle around the vertical axis within a predetermined angle range consists of a swing motor and a swing conversion mechanism that converts the rotational motion of the swing motor into swinging motion, so it is possible to provide an operating mechanism that reliably slides the air blowing nozzle in the forward and backward directions and swings the test liquid spraying nozzle. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a magnetic particle flaw detector according to an embodiment, viewed from diagonally above the front left. [Figure 2] FIG. 2 is a perspective view of the magnetic particle flaw detector according to the embodiment, viewed from the rear left side. [Figure 3] FIG. 2 is a side view of the magnetic particle flaw detector according to the embodiment, seen from the side that contacts the side surface of the subject. [Figure 4] FIG. 2 is a diagram showing the positional relationship between the magnetar and the subject before the flaw detection area is magnetized. [Figure 5] FIG. 10 is a diagram showing the positional relationship between the magnetar and the subject during preparation for magnetization of the inspection area. [Figure 6] FIG. 2 is a diagram showing the positional relationship between the magnetar and the test object at the time when the inspection area is magnetized. [Figure 7] 5A and 5B are diagrams illustrating a guide roller and a magnetic attraction mechanism according to an embodiment, and the operation of the magnetic attraction mechanism. [Figure 8] FIG. 10 is a diagram illustrating a state in which the blower of the embodiment is positioned in the front. [Figure 9] FIG. 10 is a diagram showing a state in which the blower of the embodiment is positioned at the rear. [Figure 10] FIG. 2 is a diagram showing the blower of the embodiment as viewed obliquely from below. [Figure 11] 10A and 10B are diagrams illustrating the sliding of the air blowing nozzle and the swinging of the test liquid spraying nozzle in the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to examples. [Example]

[0014] FIG. 1 is a perspective view of the magnetic particle flaw detector according to the embodiment, seen from diagonally above the front left; FIG. 2 is a perspective view of the magnetic particle flaw detector from the rear left; and FIG. 3 is a side view of the magnetic particle flaw detector from the side that contacts the side of the test object 1. 1 to 3, the magnetic particle flaw detector of the embodiment has a carriage 6 and a small carriage 11. The carriage 6 has a frame consisting of a chassis section 2, a support section 3, and a Magnar support frame 4, and four wheels 5 installed at the bottom of the chassis section 2, and the small carriage 11 has a small chassis section 8 connected to the right side of the chassis section 2 in the direction of travel by an L-shaped connector 7, a small support section 9, and four small wheels 10 installed at the bottom of the small chassis section 8.

[0015] On the chassis part 2 are mounted an oiler 12 (test liquid spraying mechanism) for spraying test liquid containing magnetic particles onto the test area of ​​the test specimen 1, a blower 13 (test liquid diffusion mechanism) for blowing air onto the test area onto which the test liquid has been sprayed, a black light 14 for irradiating ultraviolet light when observing the test area onto which the test liquid has been sprayed, a camera 15 for photographing the test area being irradiated with ultraviolet light, a laser pointer 16 for shining a spot on any point in the test area, a guide roller 17 that comes into contact with the side of the test specimen 1 and can roll in the direction of travel of the cart 6, and a magnetic mechanism 18 that acts to press the guide roller 17 against the side of the test specimen 1. In Figures 2 and 3, thin lines extend from the camera 15 and the tip of the test liquid spray nozzle 12N of the oiler 12, but these indicate the optical axis of the camera 15 and the spray direction of the test liquid spray nozzle 12N and do not actually exist. The magnetic attraction mechanism 18 is provided directly above the guide roller 17, and two sets of guide rollers 17 and magnetic attraction mechanisms 18 are provided at the front and rear of the chassis portion 2, protruding to the left in the traveling direction.

[0016] The Magnar support frame 4 is installed in the center of the chassis section 2 so as to be perpendicular to the traveling direction of the carriage 6 and extend obliquely at an angle of 45 degrees with respect to the upper surface (horizontal plane) of the chassis section 2. A sliding body moving means 19 is installed on the upper part of the Magnar support frame 4, and a sliding body 20 that slides in the longitudinal direction of the Magnar support frame 4 in response to the extension and contraction of a sliding body operating rod 19R is installed on the lower part of the sliding body moving means 19. Furthermore, U-shaped member 21, which is formed to protrude from the bottom of sliding body 20, has elongated holes 21H formed on opposing side surfaces, and shafts 23 that connect the tops of two L-shaped magnetoresistive holders 22 are inserted into these elongated holes 21H (see FIG. 4). Magnars consisting of magnetoresistive main body 24, flat portion-side magnetic pole 25, and side portion-side magnetic pole 26 are fixed to the bottom of the two L-shaped magnetoresistive holders 22. The shape of the magnet main body 24 is U-shaped, and at the tip of one side there is formed a flat side magnetic pole 25 whose lower surface can come into contact with the flat surface of the subject 1, and at the tip of the other side there is formed a side side magnetic pole 26 whose side surface can come into contact with the side surface of the subject 1. The movements and detailed configurations of the sliding body 20, the U-shaped member 21, the two L-shaped Magnar holders 22, the shaft portion 23, and the Magnar will be described later.

[0017] At the top of the support 3, there is installed a control panel 27 having switches for controlling the on / off and intensity of the oiler 12, blower 13, black light 14 and Magnar main body 24, a camera switch for controlling the shutter, focus adjustment mechanism and angle of view adjustment mechanism of the camera 15, a laser pointer switch for controlling the on / off and direction of the laser pointer 16, a slider switch for controlling the slider moving means 19, and a Magnar switch for controlling the power supply to the Magnar main body 24, and a display device 28 (personal computer, tablet terminal, etc.) for displaying an image of the flaw detection area photographed by the camera 15 and storing the image information in a storage device. The inspector then checks the image of the flaw detection area displayed on display device 28, and if he determines that there is a flaw, he operates the laser pointer switch to turn on laser pointer 16, controls the direction so that the spot hits the location of the flaw, and then operates the shutter of camera 15. On the other hand, if he determines that there is no flaw, he operates the shutter of camera 15 without turning on laser pointer 16. When the shutter operates, camera 15 captures an image of the flaw detection area of ​​specimen 1 and transmits the image information to display device 28. The transmitted image information is stored in the storage device of display device 28 together with position information of the flaw detection area and the inspection date and time.

[0018] On the small chassis portion 8, a compressor is mounted, which is made up of a compressor 29 and a tank 30 for storing compressed air, and serves as a power source for the sliding body moving means 19. The small cart 11 is connected to the chassis 2 of the cart 6 by an L-shaped connector 7 and has four small wheels 10 at the bottom, so it moves together with the cart 6.

[0019] Figure 4 is a diagram showing the positional relationship between the Magnar and the test object before the flaw detection area is magnetized, Figure 5 is a diagram showing the positional relationship between the Magnar and the test object while the flaw detection area is being prepared for magnetization, and Figure 6 is a diagram showing the positional relationship between the Magnar and the test object at the time the flaw detection area is magnetized. 4 to 6, in order to make it easier to see the positional relationship between the Magnar and the subject, components that are not directly related to supporting, holding, and moving the Magnar are omitted.

[0020] Next, the configuration related to the movement of the Magnar will be described. The sliding body moving means 19 installed on the top of the magnar support frame 4 is operated by air pressure from a compressor and extends and retracts the sliding body operating rod 19R. Two sliding body springs 20S are provided between the top of the sliding body 20 and the bottom of the magnar support frame 4, and urge the sliding body 20 downward. A U-shaped body 21 is connected to the lower side of the sliding body 20, and elongated holes 21H are provided on two side surfaces of the U-shaped body 21. The longitudinal direction of the elongated holes 21H is perpendicular to the slope of the Magnar support frame 4. Axles 23 connecting two L-shaped Magnar holders 22 are passed through the two elongated holes 21H, and the two L-shaped Magnar holders 22 and the Magnars fixed to their lower parts are suspended from the U-shaped body 21 in a rotatable manner. Furthermore, a holder spring 21S is provided between the connection pin 21P connecting the upper end of the U-shaped body 21 and the holder connection pin 22P connecting the upper ends of the two L-shaped Magnar holders 22, so that when no external force is acting, the shaft portion 23 is positioned at the lower end of the elongated hole 21H due to gravity and the upward biasing force of the holder spring 21S. When the slide-body operating rod 19R extends, the slide body 20 moves downward, and when the slide-body operating rod 19R contracts, the slide body 20 moves upward.

[0021] At the start of magnetic particle testing, the flat surface side magnetic pole 25 and the side surface side magnetic pole 26 are separated from the flat surface and the side surface of the test object 1, respectively, as shown in FIG. With both magnetic poles 25 and 26 separated from the test object 1, the cart 6 is moved so that the two guide rollers 17 come into contact with the side surfaces of the test object 1 as shown in FIG. 1, and the cart 6 is positioned in the flaw detection area. Then, when the sliding body operating rod 19R is extended and the sliding body 20 and the U-shaped body 21 are moved downward along the upper surface of the Magnar support frame 4, the L-shaped Magnar holder 22 and the Magnar suspended from the U-shaped body 21 also move downward, and the flat portion side magnetic pole 25 comes into contact with the flat portion of the subject 1, as shown in Figure 5. Thereafter, when the slider operating rod 19R is further extended from the state shown in Fig. 5, the U-shaped body 21 moves diagonally downward, and the shaft 23 also moves diagonally downward. However, the flat portion-side magnetic pole 25 is in contact with the flat portion and cannot move any further, so as shown in Fig. 6, only the shaft 23 rotates forward around the contact point between the flat portion-side magnetic pole 25 and the flat portion. Then, the shaft 23 stops when the side portion-side magnetic pole 26 reaches the side portion of the test object 1. Therefore, in Fig. 6, the flat portion-side magnetic pole 25 and the side portion-side magnetic pole 26 are in firm contact with the flat portion and the side portion of the test object 1, respectively, and the test area can be reliably magnetized. In the state shown in FIG. 6, the shaft portion 23 is positioned above the elongated hole 21H.

[0022] Fig. 7 is a diagram illustrating the guide roller 17 and the magnetic attraction mechanism 18 of the embodiment, and the operation of the magnetic attraction mechanism 18. Fig. 7(A) is a front view of one set of guide rollers 17 and the magnetic attraction mechanism 18 in the normal state, as viewed from the front side of the carriage 6, and Figs. 7(B) to (F) are diagrams illustrating the arrangement of magnets inside the magnetic attraction mechanism 18 and the state of magnetic flux in various states. A pair of guide rollers 17 and magnetic attraction mechanism 18 are installed close to each other on the same stand as shown in Fig. 2, and when the carriage 6 moves to the next inspection area, the guide rollers 17 rotate in contact with the side surface of the test object 1, as shown in Fig. 7(A), and the magnetic attraction mechanism 18 is disposed so as to maintain a small gap from the side surface of the test object 1, and acts to press the guide rollers 17 against the side surface of the test object 1. Therefore, the carriage 6 can move to the next inspection area without shifting, while maintaining a certain distance from the side surface.

[0023] 7(B) shows the arrangement of magnets and magnetic flux inside the magnetic attraction mechanism 18 in the normal state. That is, on the right side of the magnetic attraction mechanism 18 (the side of the subject 1), a right central permanent magnet with an N pole on its top surface and an S pole on its bottom surface is placed in the center, and above and below it, at equal intervals, are placed an upper right permanent magnet and a lower right permanent magnet with an S pole on their top surface and an N pole on their bottom surface. Non-magnetic bodies (buffers) for adjusting the attraction force are provided to the right of these three permanent magnets. In addition, on the left side (carriage 6 side) of the magnetic attraction mechanism 18, a left upper magnet (permanent magnet in the embodiment) is arranged adjacent to the right central permanent magnet and the right upper permanent magnet, and in the normal state the right side is the north pole and the left side is the south pole, and a left lower magnet (permanent magnet in the embodiment) is arranged adjacent to the right central permanent magnet and the right lower permanent magnet, and in the normal state the right side is the south pole and the left side is the north pole. The housing of the magnetic attraction mechanism 18 is made of a non-magnetic material (for example, aluminum or hard resin).

[0024] 7(B), a closed magnetic circuit indicated by a dotted line is formed around the permanent magnet at the center of the right side, and the magnetic attraction mechanism 18 moves in a direction to attract the side surface of the subject 1, which acts to press the guide roller 17 against the side surface of the subject 1. Therefore, the guide roller 17 can guide the carriage 6 without separating from the side surface. However, if some external force is applied and the magnetic attraction mechanism 18 comes too close to the side surface, as shown in Fig. 7(C), the side surface of the housing of the magnetic attraction mechanism 18 may be attracted to the side surface of the subject 1, causing the carriage 6 to stop. Therefore, when the state shown in Fig. 7(C) occurs, the dial 31 on the top of the magnetic attraction mechanism 18 is rotated 180 degrees as shown in Fig. 7(D). In the state shown in Figure 7(D), the upper left magnet fixed to the shaft (not shown) extending downward from the dial 31 has a south pole on the right side and a north pole on the left side, and the lower left magnet fixed to the same shaft has a north pole on the right side and a south pole on the left side. As a result, three closed magnetic circuits shown by dotted lines are formed between the upper right permanent magnet and the upper left magnet, between the central right permanent magnet, the upper left magnet and the lower left magnet, and between the lower right permanent magnet and the lower left magnet, so that the magnetic attraction mechanism 18 loses its attraction force on the side portion of the subject 1. When the magnetic attraction mechanism 18 loses its adhesive force against the side surface of the subject 1, the repulsive force of the guide roller 17, which is pressed firmly against the side surface of the subject 1, causes the magnetic attraction mechanism 18 to separate from the side surface, resulting in the state shown in Figure 7(E). Then, when the dial 31 is rotated 180 degrees, the upper left magnet will have its right side as the north pole and its left side as the south pole, and the lower left magnet will have its right side as the south pole and its left side as the north pole, returning to the normal state shown in Figure 7(B), as shown in Figure 7(F).

[0025] Figure 8 is a diagram showing the state in which the blower 13 of the embodiment is positioned at the front, Figure 9 is a diagram showing the state in which the blower 13 of the embodiment is positioned at the rear, Figure 10 is a diagram showing the state in which the blower 13 of the embodiment is viewed from diagonally below, and Figure 11 is a diagram explaining the sliding of the blower nozzle 13N of the embodiment in the forward and backward directions and the swinging of the test liquid spraying nozzle 12N. As shown in FIGS. 8 and 9, the blower 13 is made up of a blower 13B that blows out air, and an air blowing nozzle 13N that blows the air blown out from the blower 13B onto the flaw detection area. 10 and 11(A) and (B), the blower 13 is installed so as to be slidable in the front-to-rear direction on the underside of a blower fixing plate 13F that is installed to protrude to the left in the traveling direction in front of the chassis part 2. The sliding mechanism of the blower 13 is installed on the upper surface of the blower fixing plate 13F and comprises a sliding motor 13M that supplies power for sliding the blower 13 in the front-to-rear direction within a predetermined operating range, a sliding crank 13C fixed to the rotating shaft of the sliding motor 13M, a slider 13S that is slidably attached to the underside of the blower fixing plate 13F and to which a blower 13B is fixed, and a connecting rod 13R that has hinge pins on both ends and connects the tip of the sliding crank 13C to the front end of the slider 13S. That is, by converting the rotational motion of the sliding motor 13M into linear motion via the sliding crank 13C and the connecting rod 13R and sliding the slider 13S, the blower 13 can be slid in the forward and backward directions within an operating range of a distance d from the forward position shown in Figures 8 and 11(A) to the rearward position shown in Figures 9 and 11(B).

[0026] As shown in Figures 10 and 11(C) and (D), a spray nozzle support plate 12S is installed above the test liquid spray nozzle 12N to support the nozzle 12N and its swing mechanism, and a swing motor 12M is installed on the upper surface of the spray nozzle support plate 12S to supply power to swing the test liquid spray nozzle 12N within a predetermined angle range. A spray nozzle holder 12H that holds the test liquid spray nozzle 12N is installed on the underside of the spray nozzle support plate 12S so that it can rotate about a vertical axis. The swing mechanism of the test liquid spray nozzle 12N consists of a swing motor 12M, a swing crank 12C fixed to the rotating shaft of the swing motor 12M, and a swing link 12L with hinge pins at both ends that connect the tip of the swing crank 12C to the spray nozzle holder 12H. That is, the rotational motion of the swing motor 12M is converted into swing motion via the swing crank 12C and the swing link 12L, and by swinging the spray nozzle holder 12H, the test liquid spray nozzle 12N can be swung within a predetermined angle range around the vertical axis. In Figures 10 and 11(C) and (D), nothing is connected to the rear end of the test liquid spray nozzle 12N, but in reality, a flexible tube for sending the test liquid is connected between the oiler 12 and the rear end of the test liquid spray nozzle 12N.

[0027] Finally, the procedure for magnetic particle inspection using the magnetic particle inspection device of the embodiment will be described. (1) It is confirmed that the guide roller 17 is in contact with the side surface of the subject 1 and the magnetic attraction mechanism 18 is spaced a small distance from the side surface (the state shown in FIG. 1). (2) After activating the black light 14 and stabilizing the brightness, ultraviolet light is constantly irradiated onto the flaw detection area of ​​the specimen 1 (the black light 14 is fixed to the tip of a flexible tube, so the direction of ultraviolet light irradiation can be freely adjusted). (3) Activate the camera 15 and the display device 28. The camera 15 takes a still image of the flaw detection area of ​​the subject 1 and transmits the image information to the display device 28. The transmitted image information is then stored in the storage device of the display device 28 together with the position information of the flaw detection area and the inspection date and time. Although the acquisition of position information will not be described in detail, if GPS can be used, the position of the dolly 6 can be easily determined. Even when working in a place where GPS cannot be used, the position of the dolly 6 can be determined by measuring the distance between the dolly 6 and the test object 1 itself or a plurality of position notification means (means that can identify the installation position) installed around the test object 1. (4) Activate the oiler 12 and the swing motor 12M, and spray the test liquid while swinging the test liquid spray nozzle 12N to spray the test liquid containing magnetic particles over the entire flaw detection area of ​​the specimen 1, and stop spraying after a predetermined time has elapsed. (5) In order to eliminate pools of test liquid, the blower 13 is operated to blow air from the blower nozzle 13N onto the surface of the test area where the test liquid has been sprayed, thereby controlling the flow rate of the test liquid containing magnetic particles. Furthermore, the test liquid spray nozzle 12N and the air blowing nozzle 13N can be manually adjusted in terms of the angle of incidence and left-right angle of the test liquid and air relative to the floor surface, so that the test liquid can be accurately sprayed and air can be blown into the flaw detection area between the flat side magnetic pole 25 and the side side magnetic pole 26. Furthermore, by rotating the sliding motor 13M, the blower 13 can be slid from a forward position to a rearward position, so that the blower nozzle 13N can be positioned in a position where the air can easily reach the liquid pool in the inspection area, and then the blower nozzle 13N can be moved forward or rearward to reliably eliminate the liquid pool. (6) By operating the switch on the control panel 27 installed on the top of the support part 3, the sliding body moving means 19 is activated and the sliding body operating rod 19R is retracted, so that the flat part side magnetic pole 25 and the side part side magnetic pole 26 are separated from the flat part and the side part of the test piece 1, respectively (the state shown in Figure 4), and then the magnetic particle flaw detector is moved to the operation start position. (7) The slider operating rod 19R is extended to bring the flat portion side magnetic pole 25 into contact with the flat portion of the subject 1 (the state shown in FIG. 5). (8) The slider operating rod 19R is gradually extended, and when the side surface side magnetic pole 26 comes into contact with the side surface of the subject 1 (the state shown in FIG. 6), the extension of the slider operating rod 19R is stopped. (9) The switch on the control panel 27 is operated to energize the magnetoresistive body 24. Then, the region to be inspected of the subject 1 is magnetized.

[0028] (10) During steps (4) to (9), video images of the surface of the inspection area are captured by camera 15 and displayed on display device 28. The inspector checks the video images, and if he determines that there is a flaw, he turns on laser pointer 16 and controls its direction so that the spot hits the flawed area. Then, the inspector draws a circle with chalk around the spot. The circled area indicates the location where the flaw will be repaired with a grinder after the inspection. After steps (11) and (10) are completed, the power supply to the Magnar main body 24 is stopped.

[0029] (12) After the examiner has finished checking the images, etc., he operates the switch on the control panel 27 to operate the slider moving means 19 again and retract the slider operating rod 19R, so that the flat portion side magnetic pole 25 and the side portion side magnetic pole 26 are separated from the flat portion and side portion of the subject 1, respectively (the state shown in Figure 4). (13) Push the cart 6 forward until it reaches the next inspection area. (14) After the carriage 6 is stopped, the magnetic particle inspection is carried out according to the procedures described in (4) to (11) above. Thereafter, by repeating the steps (12) to (14), the carriage 6 is moved along the side surface of the test object 1, and magnetic particle inspection can be repeatedly performed. Although not shown, power is supplied to the oiler 12, blower 13, black light 14, camera 15, laser pointer 16 and Magnar main body 24 by placing power cords along the chassis 2 and support 3 in a path that does not interfere with the field of view of the camera 15 or the movement of the wire 18, and by inserting a power plug into an outlet provided on the control panel 27 which receives power from the power line.

[0030] Modifications of the embodiment are listed below. (Variant 1) In the embodiment, the chassis part 2 and the support part 3 are fixed so that the angle between them is 90 degrees. However, in order to allow access even if the entrance to the place where the magnetic particle inspection work is performed is narrow, and to make it easier to transport, it is better to provide a frame fixing device that allows the angle to be selectively fixed at either 90 degrees or 180 degrees, or a detachable device that allows the support part 3 to be detached from the chassis part 2. (Variation 2) In the embodiment, the small cart 11 is connected to the chassis part 2 of the cart 6 by the L-shaped connector 7 and moves together with the cart 6, but the small cart 11 may be placed near the cart 6 without moving together and connected to the Magnar moving device 19 by a flexible pipe or the like. Also, the area of ​​the chassis part 2 may be widened so that a compressor can be placed thereon, and a magnetic particle inspection device without the small cart 11 may be used. (Variant 3) In the embodiment, the trolley 6 has four wheels 5 and the small trolley 11 has four small wheels 10, but since the wheels 5 and small wheels 10 only need to be able to stably support the frame, it is sufficient to have three or more wheels 5 and small wheels 10.

[0031] (Variation 4) In the magnetic particle flaw detector of the embodiment, the shaft 23 is passed through the two elongated holes 21H, and the two L-shaped Magnar holders 22 and the Magnar fixed to the lower part thereof are rotatably suspended from the U-shaped body 21. However, the two L-shaped Magnar holders 22 may be held by the Magnar main body 24 so that they can slide relative to the Magnar support frame 4 and be rotatable around a parallel line that is parallel to the traveling direction of the carriage 6. In such a case, in addition to the Magnar moving means (corresponding to the slide moving means 19, slide operating rod 19R, slide 20, slide spring 20S, and U-shaped member 21 of the embodiment) that moves the Magnar main body 24 and the L-shaped Magnar holder 22 in the longitudinal direction of the Magnar support frame 4, it is necessary to provide a Magnar rotating means that rotates the Magnar main body 24 around the parallel line. In addition, the magnetic particle inspection device of the embodiment is specialized for a magner having a flat portion side magnetic pole and a side portion side magnetic pole in order to detect defects present in steel plates near fillet welds and joints, but the functions of the inspection liquid spray nozzle 12N and the blower 13 are also useful in a magnetic particle inspection device that detects defects present in the flat portion of the specimen 1, so the magner can be of any configuration. (Variant 5) In the magnetic particle flaw detection device of the embodiment, the Magnar moves the U-shaped body 21 downward along the upper surface of the Magnar support frame 4, so that the flat portion side magnetic pole 25 and the side portion side magnetic pole 26 are in contact with the flat portion and side portion of the specimen 1, respectively (the state in Figure 6), and once the inspector has finished checking the images, etc., the U-shaped body 21 is moved upward along the upper surface of the Magnar support frame 4, so that the flat portion side magnetic pole 25 and the side portion side magnetic pole 26 are separated from the flat portion and side portion of the specimen 1, respectively (the state in Figure 4). However, the mechanism for moving the flat-section-side magnetic pole and the side-section-side magnetic pole of the Magnar toward and away from the flat-section and side-section of the subject 1, respectively, is not limited to the mechanisms described in the embodiment and Modification 4, and may be any mechanism as long as it has a flat-section-side magnetic pole that is perpendicular to the traveling direction of the carriage 6 and whose bottom surface can be moved toward and away from the flat-section of the subject, and a side-section-side magnetic pole that is perpendicular to the traveling direction of the carriage 6 and whose side surface can be moved toward and away from the side surface of the subject. For example, as in the magnetization device for fillet weld inspection described in Patent Document 2, a mechanism may be used in which a flat-section-side magnetic pole extends downward from the chassis 2 and a side-section-side magnetic pole extends laterally, and the gap between the bottom surface of the flat-section-side magnetic pole and the flat section of the subject and the gap between the side surface of the side-section-side magnetic pole and the side surface of the subject are maintained at predetermined dimensions, so that when current is applied to the Magnar, the magnetic poles are attracted to the flat-section and side surface of the subject. (Variant 6) The magnetic particle flaw detector in the embodiment is equipped with a laser pointer 16, but as a means of indicating the location of flaws, the relevant location in the flaw detection area can also be marked directly using chalk or the like, so the laser pointer 16 does not have to be provided.

[0032] (Modification 7) In the embodiment, the magnetic attraction mechanism 18 is provided directly above the guide roller 17, but it may be provided anywhere near the guide roller 17. Furthermore, if the magnetic particle inspection device is designed to detect defects present on the flat surface of the test piece 1, there is no need to pay special attention to the distance between the trolley 6 and the side surface of the test piece 1. Even if the magnetic particle inspection device is designed to detect defects present on the steel plate near fillet welds or joints, the inspector can move the trolley 6 while paying attention to the distance between the trolley 6 and the side surface of the test piece 1, so it is possible to perform magnetic particle inspection without providing guide rollers 17 and a magnetic attraction mechanism 18. (Modification 8) The magnetic particle flaw detector of the embodiment is provided with two sets of guide rollers 17 and magnetic attraction mechanisms 18, but it may be provided with one set of guide rollers 17 and magnetic attraction mechanisms 18. (Variant 9) In the magnetic attraction mechanism 18 of the embodiment, the upper left magnet and the lower left magnet are permanent magnets, and the north and south poles are swapped by rotating the shaft extending from the dial 31. However, the upper left magnet and the lower left magnet may be electromagnets, and the north and south poles may be swapped by changing the direction of the current flowing through each coil. (Variant 10) The magnetic particle flaw detector of the embodiment was equipped with a magnetic attraction mechanism 18 having the internal structure shown in Figure 7, but it is not limited to this structure and any structure of magnetic attraction mechanism that is generally sold as a magnet base and can turn magnetic force on and off may be used. Furthermore, instead of a magnetic attraction mechanism that can turn the magnetic force on and off, a magnetic attraction mechanism with a built-in permanent magnet that acts to constantly press the guide roller 17 against the side surface of the subject 1 may be used. However, in such a case, if the magnetic attraction mechanism is attracted to the side surface of the subject 1, the examiner must remove the magnetic attraction mechanism from the side surface of the subject 1, either directly or by using an appropriate tool.

[0033] (Variant 11) In the magnetic particle flaw detector of the embodiment, the blower 13B and the air blowing nozzle 13N slide together, but the blower 13B and the air blowing nozzle 13N may be connected by a flexible hose or the like, and only the air blowing nozzle 13N may slide in the forward and backward directions of the carriage 6. (Variant 12) In the embodiment, the blower 13 is slid back and forth by connecting the tip of the crank 13C fixed to the rotating shaft of the sliding motor 13M to the front end of the slider 13S with a connecting rod 13R having hinge pins on both ends, but sliding may also be achieved using a rack and pinion mechanism, a linear motor, a solenoid, etc. (Variant 13) The magnetic particle flaw detection device of the embodiment does not have a stopper for fixing the trolley 6 in a predetermined position, but a stopper may be provided at any position on the wheels 5 or chassis part 2, and the stopper may be operated to fix the trolley 6 when the trolley 6 is moved to the work start position.

[0034] (Variant 14) The magnetic particle flaw detector of the embodiment is equipped with a display device 28 and the captured images are recorded in a memory device built into the display device 28, but if the camera 15 has a display function and an image storage function, it does not need to be equipped with a display device 28. In addition, information about the captured image may be transmitted from the camera 15 to an information terminal (notebook PC, tablet terminal, headset, etc.) held by the inspector using an appropriate information transmission means, and the captured image may be displayed or recorded on a display device or storage device provided in the information terminal. (Variant 15) The magnetic particle flaw detector in the embodiment is provided with a control panel 27, but if on / off and intensity control can be performed on each device side, the shutter, focus adjustment and angle of view adjustment of the camera 15 can be performed on the camera side, and the image displayed on the display device 28 can be controlled on the display device side, the control panel 27 does not need to be provided. In such a case, power can be supplied to each device by placing a device with multiple outlets, such as a power strip connected to the power line, on the cart 6 and inserting power plugs into those outlets, or by using long power cords for each device and inserting power plugs into outlets located in a location separate from the cart 6. Furthermore, even if each device is controllable, a control panel 27 may be installed, and a switch may be provided to select the device to be controlled and control that device. [Explanation of symbols]

[0035] 1 Test object 2 Chassis part 3 Support part 4 Magnar support frame 5 Wheel 6 Bogie 7 Connector 8 Small chassis part 9 Small support part 10 small wheel 11 small carriage 12 oiler 12C swing crank 12H Spray nozzle holder 12L Swing link 12M Swing motor 12N Test liquid spray nozzle 12S Spray nozzle support plate 13 Blower 13B Blower 13C Sliding crank 13F Blower fixing plate 13M Sliding motor 13N Blower nozzle 13R Connecting Rod 13S Slider 14 Black Light 15 Camera 16 Laser pointer 17 Guide roller 18 Magnetic attraction mechanism 19 Slider moving means 19R Slider operating rod 20 Slider 20S Spring for slider 21 U-shaped member 21H Oblong hole 21P Connecting pin 21S Retainer spring 22 L-shaped Magnar holder 22P Holder connection pin 23 Shaft 24 Magner main body 25 Magnetic pole on flat side 26 Magnetic pole on side side 27 Control panel 28 Display unit 29 Compressor 30 Tank 31 Dial

Claims

1. A magnetic particle inspection device comprising a frame, a carriage having three or more wheels, a Magnar, an Euler, and a black light, A blower including a blower for blowing air and a blowing nozzle for blowing the air blown from the blower onto the flaw detection area is installed at the bottom of the frame, A sliding mechanism is provided to slide at least the air blowing nozzle in the front-rear direction of the carriage. A magnetic particle inspection device characterized by:

2. A flexible pipe and a test liquid spray nozzle for sending the test liquid from the oiler are installed at the bottom of the frame, The test liquid spray nozzle is provided with a swinging mechanism that swings the test liquid spray nozzle around a vertical axis within a predetermined angle range.

2. The magnetic particle inspection device according to claim 1.

3. the sliding mechanism includes a sliding motor and a sliding conversion mechanism that converts the rotational motion of the sliding motor into linear motion; The swing mechanism comprises a swing motor and a swing conversion mechanism that converts the rotational motion of the swing motor into swing motion.

3. A magnetic particle inspection device according to claim 1 or 2.

Images