SU1605183A1 - Magnetizing device for magnetic flaw detection - Google Patents

Abstract

The invention relates to magnetic flaw detection and can be used to control the quality of ferromagnetic materials and welded joints on installation in field conditions with limited access to power supply. The aim of the invention is to simplify the design and increase the functionality by adjusting the magnitude and direction of the magnetic flux. The device contains two rod magnets 1 connected by a flexible rod 2. Each magnet consists of two concentrators 5 and 6 and a permanent magnet 4 of cylindrical shape, installed between two concentrators with the possibility of free rotation around its axis. The flexible yoke 2 is associated with the free end of one of the concentrators 5 of each bar magnet, the free end of the other concentrator 6 is working. When the handle 7 is turned to position B, the bar magnets are turned on and the magnetic flux flows between them, and the rod magnet is turned off to 0 on the scale of 8 due to shunting of the magnetic fluxes of the permanent magnet by concentrators 5 and 6. 1 Cp. f-ly. 2 Il.

Description

FIG. one

1605183

rod magnets 1 connected by flexible rm 2. Each magnet consists of two concentrates 5 and 6 and a permanent magnet 4 of cylindrical shape, installed between two concentrators with the possibility of free rotation around its axis. The flexible rm 2 is connected to the free end of one of the hubs 5 each pivotal Q

the magnet, the free end of the other hub 6 is working. When the handle 7 is turned to position B, the rod magnets are turned on and the magnetic flux flows between them, and in position O on a scale of 8, the rod magnet is turned off due to shunting the magnetic fluxes of the permanent magnet by concentrators 5 and 6. 1 ly, 2 Il.

The invention relates to non-destructive testing, in particular to magnetic flaw detection, and can be used to control the quality of ferromagnetic materials and welds on an installation in field conditions where power supply is difficult.

The aim of the invention is to simplify the design and increase the functionality by adjusting the magnitude and direction of the magnetic flux.

Fig, 1 is given a magnetizing device, a general view; FIG. 2 shows the magnetic system of the device when shunting magnetic flux.

The device contains two rod magnets 1 connected by a flexible rm 2, each rod magnet contains permanent magnet 4 and two non-magnetic case 3 and two. Concentrator a 5 and 6, permanent magnet 4 is cylindrical, magnetized perpendicular to the longitudinal axis and mounted between two the concentrators 5 and 6 can be rotated around their longitudinal axis, the mating surfaces of the concentrators are made in the form of the lateral surface of the permanent magnet 4, the flexible PM 2 is connected to the free end of one of the concentrators Hur 5 of each bar magnet 1, the other free end of the hub 6 is operating, and an axial section of the permanent magnet is equal to the cross section of the hub perpendicular to the axis of the bar magnet. At the end of the permanent magnet, a knob 7 is installed to rotate it around the axis a and on the case there is a scale 8 and a clamp 9 dp of fixing the position of the permanent magnet in a predetermined position. When inspecting, the bar magnets are mounted on the product 10, and in the presence of

0

25

thirty

35

0 dd

50

55

defect flows 11 are scattered. To remove rod magnets, 1 permanent magnet is rotated so that magnetic fluxes I2 and 13 are shunted by concentrators 5 and 6,

The device works in the following way.

To magnetize the product 10, the device is mounted on its surface. Handles 7 of the rods are located in the position B - on. In this case, the magnet 4 poles adjoins the cylindrical conjugate surfaces of the concentrators, the magnetic flux passes through the product 10, and if there are defects in it, scattered fluxes appear, which are fixed by magnetic control methods.

The elimination of the efforts required to detach the magnetic rods from the surface of the product is accomplished by withdrawing the working ends of the magnetic flux by shunting (Fig. 2). This is achieved by turning the handle 7 to 90 to the O position - off, To cylindrical areas of each concentrator two poles of magnet 4 are attached, shunting of magnetic fluxes 12 and 13 occurs through concentrators 5 and 6, which in this case act as shunts. The magnetic resistance of the path through the shunts is significantly less than the magnetic resistance of the magnetic path, the magnet - concentrator - part flux. Consequently, the working ends of the device become non-magnetic.

The presence on the case of a scale 8 with an indicator of the magnet rotation by 90 and with its fixation with the help of a clamp 9 in two extreme positions make it possible to regulate the magnitude of the magnetic inductor; and, while controlling the ferromagnetic products. This is especially important 51605183

but with magnetic powder inspection of welded metal structures.

The device allows magnetization of products of any shape and in any spatial position.

The device is designed to turn on one of the two rods of the magnet by rotating the permanent magnet, turning on the two rod mats counter or sequentially, the ability to change the polarity of the magnetization during the rotation of the permanent magnet and turning off the rods of the magnet simultaneously or separately.

The device also provides control of the magnetic flux. So, at the angle of magnet position ei

0 induction, at about 90

olo

and about

Claims (1)

1, a magnetizer for magnetic flaw detection, containing two flexible rods of 15 rods of magnet connected to each other, each of which is a permanent magnet placed in a non-magnet case with concentrators, characterized in that d ". m А m A J l. L1b, GU 270 induction B is maximal for data and functional design of the vehicle. Investigations of the structural design of the device showed that, for example, if permanent magnets with an inductive free pole of 213 and an area of 6 cm were used, concentrators with a cross section of 6 cm would be optimal. The length of the concentrators was 3-6 cm; 2 times more than 400 mT when the upper hubs are connected with the rod. The measurements were carried out on a steel plate 3 with dimensions 250X30 5 mm. The working ends were set at a distance of 100 m, in the center of the plate there was a groove with a width of 1 mm and a depth of 3 mm, in which the Hall sensor was located.  h . . When turning the device handle the position of the Hall sensor did not indicate the presence of induction in the sample gap, regardless of the section and length of the concentrators. by adjusting the magnitude and direction of the magnetic flux, the permanent magnet of each bar magnet is cylindrical, 25 is magnetized perpendicularly longitudinally to the axis and mounted between two concentrators with the possibility of rotation of the circles of its longitudinal axis; the surfaces of the concentrators are conjugated 30 according to the shape of the lateral surface of the permanent magnet, the flexible RME is connected by the free end of one of the concentrators of each bar magnet, the free end of the other is the concentrator - is working and axial section the permanent magnet is equal to the section to the centralizer, perpendicular to the axis of the bar magnet. 2, The device according to claim 1, O TL and h This is due to the fact that at the end of the permanent magnet there is a knob for turning it around the axis, and on the case there is a scale and a lock for turning the constant magnet. With longitudinal magnetization of the plate on the metal surface, transverse cracks 1 were detected, 3-12 mm in length with a opening width of 2-185 µm, This device is structurally simpler and much more convenient in operation, ten Invention Formula 1, A magnetizer for magnetic flaw detection, containing two flexible rods connected by a bar magnet, each of which is a permanent magnet placed in a non-magnetic case with concentrators, characterized in that, in order to simplify the design. m А m A J l. L1b, GU functionalities by adjusting the magnitude and direction of the magnetic flux, the permanent magnet of each bar magnet is cylindrical, magnetized perpendicular to the longitudinal axis and mounted between two concentrators with the possibility of rotating wok-. From its longitudinal axis, the mating surfaces of the hubs are made according to the shape of the lateral surface of the permanent magnet, the flexible RMI is connected to the free end of one of the concentrators of each bar magnet, the free end of the other concentrator is working and axial section the permanent magnet is equal to the cross section of the concentrator, perpendicular to the axis of the bar magnet. 2, the device according to claim 1, wherein the handle is mounted at the end of the permanent magnet to rotate around the axis, and the scale and lock of the turn of the permanent magnet are mounted on the body. 13