CN2490583Y - Portable multichannel magnetic leakage material deflectoscope - Google Patents

Abstract

The utility model relates to a multi-channel portable magnetic flux leakage material defect detector, which comprises a partition, a permanent magnet, a wedge-shaped block and a multi-channel probe, etc., the partition is fixed in the middle of the cabinet, and the permanent magnet is fixed in the lower part of the center of the partition. The channel probe is fixed relative to the permanent magnet; the wedge blocks are symmetrically inserted into the yokes on both sides of the permanent magnet. The detector designed by the utility model adopts a high-performance permanent magnet as the magnetization source, and forms a closed magnetic circuit through the magnetically conductive pole piece and the workpiece to be inspected to enhance the magnetization effect. Large corrosion pit defects that change slowly can be found by changing the direction of leakage flux.

Description

Multi-channel portable magnetic flux leakage material defect detector

Technical field:

The utility model relates to a multi-channel portable magnetic flux leakage material defect detector, which belongs to the nondestructive detection of material defects

technology field.

Background technique:

In the prior art, the patented steel pipe magnetic flux leakage flaw detector with the application number 95212309 adopts a DC magnetization method, and consists of two front and rear uprighting clamping mechanisms, a circumferential defect detection mechanism and an axial defect detection mechanism, as well as a console, a detection circuit and Alarm, display, marking and other devices. The advancing steel pipe passes through the upper and lower V-shaped wheels of the front righting clamping mechanism, the fixed magnetic field and multi-channel probe of the circumferential defect detection mechanism, the rotating magnetic field and multi-channel probe of the axial defect detection mechanism, and the upper and lower V wheels of the rear righting clamping mechanism. shape wheel. Alarm, display, and mark after the detected defects distributed in the circumferential direction or axial direction.

Invention and creation content:

The purpose of this utility model is to implement a multi-channel portable magnetic flux leakage material defect detector, which uses a high-performance permanent magnet as a magnetization source, and forms a closed magnetic circuit through a magnetically conductive pole piece and a workpiece to be inspected to enhance the magnetization effect and reduce the system. overall power consumption.

The multi-channel portable magnetic flux leakage material defect detector designed by the utility model includes a beam, a column, a cam, a partition, a permanent magnet, a wedge block, a yoke, a magnetic pole shoe and a multi-channel probe. The partition is fixed in the middle of the chassis; the permanent magnet is fixed in the lower part of the center of the partition, and the multi-channel probe is fixed relative to the permanent magnet; two magnetic yokes and two magnetic pole pieces are symmetrically placed on both sides of the permanent magnet and fixed on the mold partition board and chassis. The wedges are symmetrically inserted into the yokes on both sides of the permanent magnet. The wedges are relatively fixed to one end of the column, and the other end of the column is fixed to the beam. The two ends of the beam are inserted into the guide grooves on both sides of the chassis. A concave point is provided, and the concave point engages with the cam.

The multi-channel portable magnetic flux leakage material defect detector designed by the utility model adopts a high-performance permanent magnet as the magnetization source, and forms a closed magnetic circuit through the magnetically conductive pole shoe and the workpiece to be inspected, thereby enhancing the magnetization effect and reducing the overall power consumption of the system; The two wedge blocks and the corresponding connecting rod structure can easily open and close the magnetic circuit, which is convenient for the detector to lift away from the workpiece; the battery is used as the power supply; at the same time, the inner and outer wall defects or corrosion of the steel pipe are detected; up to 16 along the direction of the detection surface The arranged multi-channel probe is used to detect the leakage magnetic field perpendicular to the detection surface, and the multi-channel can be composed of differential amplification to avoid the influence of environmental magnetic field interference; multiple multi-channel probes arranged in the direction perpendicular to the detection surface detect the magnetic flux leakage in the horizontal direction Large corrosion pit defects that change slowly can be found.

Description of drawings:

Fig. 1 is the structural representation of the detector designed by the utility model.

Fig. 2 is a signal waveform diagram of a groove defect on the outer wall.

Fig. 3 is a waveform diagram of a defect signal of an inner wall groove.

FIG. 4 is a waveform diagram of a via defect signal.

In Figure 1, 1 is the guide groove, 2 is the beam, 3 is the column, 4 is the cam, 5 is the chassis, 6 is the connecting screw, 7 is the chassis partition, 8 is the yoke, 9 is the magnetic pole shoe, and 10 is the wedge block , 11 is a multi-channel probe, 12 is a permanent magnet, and 13 is a workpiece to be inspected.

Detailed ways:

As shown in Figure 1, the multi-channel portable magnetic flux leakage material defect detector designed by the utility model includes a beam 2, a column 3, a cam 4, a partition 7, a permanent magnet 12, a wedge block 10, a yoke 8, and a pole shoe 9 and multi-channel probes11. The partition 7 is fixed in the middle of the cabinet 5; the permanent magnet 12 is fixed in the lower part of the center of the partition 7, and the multi-channel probe 11 and the permanent magnet 12 are relatively fixed. Two magnetic yokes 8 and two magnetic pole pieces 9 are placed symmetrically on both sides of the permanent magnet 12 respectively, and are fixed on the mold separator 7 and the case 5 . The wedge block 10 is symmetrically inserted into the yoke 8 on both sides of the permanent magnet 12, the wedge block 10 is relatively fixed with one end of the column 3, the other end of the column 3 is fixed on the beam 2, and the two ends of the beam are inserted into the two side walls of the cabinet In the guide groove 1, there is a concave point in the center of the beam, and the concave point is engaged with the cam 4.

The magnetic flux leakage material defect detector designed by the utility model adopts a permanent magnet placed in the center of the magnetic circuit to locally magnetize the workpiece. The permanent magnet, two symmetrically placed magnetic yokes (including wedge blocks) and two magnetic pole shoes form a half A "mouth" shape, the workpiece to be detected is placed under the two magnetic pole pieces, thus forming a closed magnetic circuit. The entire magnetization mechanism is installed in the lower half of the chassis, and the multi-channel probe for detection is installed in the middle of the lower half of the chassis. There is a wedge on the yoke near the permanent magnet. The wedge moves with the beam on the upper half of the chassis through the column. There is a cam above the middle of the beam. The rotating cam can drive the beam and the column to move the wedge up and down, thereby Complete the closing and opening of the magnetic circuit.

The working process of the detector is as follows: turn on the power switch of the detector and power on the system. Place the detector on the workpiece and rotate the cam to close the magnetic circuit. Move the detector along the surface of the workpiece (moving speed <2m/s), when there is a dangerous defect, the detector will send out an alarm signal and display the defect waveform on the LCD screen. When a workpiece needs to be transferred to another workpiece for detection after detection, disconnecting the magnetic circuit can facilitate the transfer of the workpiece. Effect:

By adopting high-performance permanent magnet as magnetization source, adopting low power consumption technology and liquid crystal display technology, and using battery as power supply, a portable magnetic flux leakage detector has been successfully developed. The detector can detect defects or corrosion of the inner and outer walls of the steel pipe at the same time through one scan, and the number of channels can reach 16. Attached drawings 2, 3, and 4 are steel pipe (wall thickness 5mm, diameter 55mm) outer wall groove defects (groove width 0.5mm, depth 0.2mm), inner wall groove defects (groove width 0.5mm, depth 0.2mm) and hole defects (diameter 0.5mm through hole) signal waveform. The magnetic measurement accuracy of the detector can reach 0.1Ga, and the multi-channel probes arranged along the horizontal direction can find large corrosion pits that change slowly.

Claims (1)

1, a kind of multi-channel portable leakage field fault in material detector is characterized in that, this detector comprises crossbeam, column, cam, dividing plate, permanent magnet, wedge, yoke, magnetic pole piece and hyperchannel probe; Described dividing plate is fixed on the middle part of cabinet; Described permanent magnet is fixed on the bottom of dividing plate central authorities, hyperchannel probe and permanent magnet relative fixed; Two yokes and two symmetrical respectively both sides that are placed on permanent magnet of magnetic pole piece, and be fixed on mould dividing plate and the cabinet; Described wedge is inserted in the yoke of permanent magnet both sides symmetrically, one end relative fixed of wedge and column, the other end of column is fixed on the crossbeam, and the two ends of crossbeam are inserted in the guide groove of cabinet two side, crossbeam central authorities are provided with concave point, and this concave point and cam meshing close.

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