Array flat coil type demagnetization device for magnetic powder detection

Abstract

The utility model relates to the technical field of detection, and particularly discloses an array flat coil type demagnetizing device for magnetic powder detection, which comprises an iron core I, an iron core II, an iron core III, an iron core IV, an alternating current coil I, an alternating current coil II, an alternating current coil III, an alternating current coil IV, a shell and a baffle plate, the two poles of the iron core II are wound with alternating current coils II in series to form a demagnetizing coil II, the two poles of the iron core III are wound with alternating current coils III in series to form a demagnetizing coil III, the two poles of the iron core IV are wound with alternating current coils IV in series to form a demagnetizing coil IV, and two baffles are arranged in the shell and divide the shell into four square grids. The demagnetizing coil I, the demagnetizing coil II, the demagnetizing coil III and the demagnetizing coil IV are fixed in the four square grids and are arranged in an array, and the shell is provided with a protective flat plate. The array flat coil demagnetizing device provided by the utility model is suitable for large-area workpieces, and can realize rapid and efficient demagnetization.

Description

Technical Field

[0001] This utility model relates to the field of detection technology, and specifically discloses an array flat coil type demagnetizing device for magnetic particle detection. Background Technology

[0002] Demagnetizing devices are primarily used to remove magnetic fields from ferromagnetic materials. The working principle of a demagnetizing device is to remove the magnetism of the workpiece by generating a magnetic field. It uses an electromagnetic coil to generate magnetic lines of force, which directly or indirectly interfere with the original magnetism of the workpiece, thus achieving demagnetization. The main types of demagnetizers in China include platform demagnetizers and frame demagnetizers. Platform demagnetizers mainly use an iron core to guide the magnetic flux of the coil onto a plane to demagnetize the workpiece. Frame demagnetizers mainly use a coil that passes through the workpiece, causing the magnetic lines of force to cut through the residual magnetism of the workpiece, thus achieving a demagnetizing effect. Currently, demagnetizing devices are not suitable for large-area workpieces, achieving rapid and efficient demagnetization.

[0003] Therefore, there is an urgent need to develop a completely new demagnetizing device to overcome the problems existing in the current technology. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] An array flat coil demagnetizing device for magnetic particle detection is characterized by comprising an iron core I, an AC coil I, an iron core II, an AC coil III, an AC coil IV, an AC coil IV, baffles, and a housing. The iron core I has AC coil I wound in series on its two poles to form demagnetizing coil I; the iron core II has AC coil II wound in series on its two poles to form demagnetizing coil II; the iron core III has AC coil III wound in series on its two poles to form demagnetizing coil III; and the iron core IV has AC coil IV wound in series on its two poles to form demagnetizing coil IV. The housing contains two baffles that divide the housing into four square grids. The demagnetizing coils I, II, III, and IV are fixed in the four square grids and arranged in an array. The housing is provided with a protective plate.

[0006] Preferably, the iron core I, iron core II, iron core III, and iron core IV have a columnar structure, and the two poles are used to wind AC coil I, AC coil II, AC coil III, and AC coil IV in series.

[0007] Preferably, AC coil I, AC coil II, AC coil III, and AC coil IV are demagnetized by passing low voltage and high current through them respectively.

[0008] Preferably, the housing is made of a non-magnetic material, and the housing is provided with threaded holes for mounting a protective plate.

[0009] Preferably, the AC coils I, II, III, and IV are arranged in an east-west orientation, with the coil axes perpendicular to the geomagnetic direction. The AC coils I, II, III, and IV are in close contact with the workpiece surface, allowing the workpiece and the demagnetizing device to move relative to each other. Each part of the workpiece passes through the center of the demagnetizing device. After moving the workpiece 1m away from the demagnetizing device, the power is cut off, causing the magnetic field to decay to zero and demagnetize.

[0010] Preferably, the demagnetizing effect of the demagnetizing device is tested by a magnetometer and should meet the specified requirements, generally not exceeding 0.3 mT.

[0011] Preferably, there are two baffles, which are arranged in a cross pattern to fix demagnetizing coil I, demagnetizing coil II, demagnetizing coil III, and demagnetizing coil IV.

[0012] The beneficial effects achieved by this utility model are:

[0013] The array flat coil demagnetizing device provided by this utility model is suitable for large-area workpieces and achieves fast and efficient demagnetization. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an array flat coil type demagnetizing device for magnetic particle detection according to the present invention. Detailed Implementation

[0015] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0016] Example 1

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1 The diagram shows a schematic of an array flat coil demagnetizing device for magnetic particle detection, comprising an AC coil I1, an iron core I2, an AC coil II3, an iron core II4, an AC coil III5, an iron core III6, an AC coil IV7, an iron core IV8, baffles 9, and a housing 10. The iron core I2 has AC coil I1 wound in series on its two poles to form demagnetizing coil I; the iron core II4 has AC coil II3 wound in series on its two poles to form demagnetizing coil II; the iron core III6 has AC coil III5 wound in series on its two poles to form demagnetizing coil III; and the iron core IV8 has AC coil IV7 wound in series on its two poles to form demagnetizing coil IV. The housing 10 contains two baffles 9, which divide the housing 10 into four square grids. The demagnetizing coils I, II, III, and IV are fixed in these four square grids and arranged in an array. Protective plates are provided on the sides of the square grids of the housing 10.

[0019] The steps for using it are as follows:

[0020] First, during demagnetization, AC coils I1, II3, III5, and IV7 are placed east-west, with their axes perpendicular to the Earth's magnetic field direction. These coils are then in close contact with the workpiece surface. Next, low-voltage, high-current demagnetization is applied to each coil, causing relative movement between the workpiece and the demagnetizing device. Each part of the workpiece is moved past the center of the demagnetizing device. The workpiece is then moved 1 meter away from the device before the power is cut off, allowing the magnetic field to decay to zero. Finally, the demagnetization effect is tested using a magnetometer. The demagnetization should meet specified requirements, generally requiring a residual magnetism of no more than 0.3 mT.

[0021] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An array flat coil type demagnetizing device for magnetic particle detection, characterized in that, It includes AC coil I (1), iron core I (2), AC coil II (3), iron core II (4), AC coil III (5), iron core III (6), AC coil IV (7), iron core IV (8), baffle (9) and shell (10); Among them, the iron core I (2) has AC coil I (1) wound in series on the two poles to form demagnetizing coil I, the iron core II (4) has AC coil II (3) wound in series on the two poles to form demagnetizing coil II, the iron core III (6) has AC coil III (5) wound in series on the two poles to form demagnetizing coil III, and the iron core IV (8) has AC coil IV (7) wound in series on the two poles to form demagnetizing coil IV. The shell (10) is provided with two baffles (9) inside. The baffles (9) divide the shell (10) into four square grids. Demagnetizing coil I, demagnetizing coil II, demagnetizing coil III and demagnetizing coil IV are fixed in the four square grids and arranged in an array.

2. The array flat coil demagnetizing device for magnetic particle detection according to claim 1, characterized in that, The housing (10) is a one-way open housing, with a protective plate closed on the other side.

3. The array flat coil demagnetizing device for magnetic particle detection according to claim 1, characterized in that, The iron core I (2), iron core II (4), iron core III (6), and iron core IV (8) are cylindrical structures, and the two poles are used to wind AC coil I (1), AC coil II (3), AC coil III (5), and AC coil IV (7).

4. The array flat coil demagnetizing device for magnetic particle detection according to claim 1, characterized in that: The AC coils I (1), II (3), III (5), and IV (7) are demagnetized by passing low voltage and high current through them respectively.

5. The array flat coil demagnetizing device for magnetic particle detection according to claim 1, characterized in that, The housing (10) is made of a non-magnetic material.

6. The array flat coil demagnetizing device for magnetic particle detection according to claim 2, characterized in that, The side wall of the housing (10) is provided with threaded holes for installing protective plates.

7. The array flat coil demagnetizing device for magnetic particle detection according to claim 1, characterized in that, The AC coils I, II, III, and IV are arranged in an east-west orientation, with their axes perpendicular to the geomagnetic direction.

8. The array flat coil demagnetizing device for magnetic particle detection according to claim 7, characterized in that, The AC coils I, II, III, and IV are in close contact with the surface of the workpiece being inspected by magnetic powder.

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