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Ferromagnetic object demagnetizing method

A kind of object and ferromagnetic technology, applied in the field of demagnetization of ferromagnetic objects, can solve the problems of time-consuming and laborious, and achieve the effect of reducing labor intensity, easy maneuvering, and good demagnetization effect

Inactive Publication Date: 2013-06-19
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for demagnetizing ferromagnetic objects, which solves the problem of time-consuming and labor-intensive demagnetization methods for ferromagnetic objects without winding demagnetization coils, so as to meet the needs of fast and convenient demagnetization of ferromagnetic objects

Method used

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Examples

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Embodiment 1

[0024] Embodiment 1, a 2-ton ferromagnetic ship, width b=1m, height h=1m, the vertical component Hz=20A / m of the local geomagnetic field, Hp=30A / m, realize overall demagnetization, include the following step:

[0025] (1) Steps for laying cables: such as figure 1 , figure 2 As shown, a ferromagnetic object with a width of b=1m and a height of h=1m is placed in the east-west direction of the geomagnetism along its axial direction, and the first to fourth pulse power sources are placed at the head of the ferromagnetic object, and the first to fourth One pole of the pulse power supply is respectively connected to the head end surface of the ferromagnetic object through cables, and the other poles of the first to fourth pulse power supplies are respectively connected to the tail end surface of the ferromagnetic object through the first to fourth cables. The two cables are respectively located on the upper left side and the upper right side of the ferromagnetic object along the ...

Embodiment 2

[0030] Embodiment 2, a 1800-ton ferromagnetic ship, width b=10m, height h=10m, the vertical component Hz=30A / m of the local geomagnetic field, Hp=20A / m, realize overall demagnetization, including the following step:

[0031] (1) Steps for laying cables: such as figure 1 , figure 2 As shown, a ferromagnetic object with a width of b=10m and a height of h=10m is placed in the geomagnetic east-west direction along its axial direction, and the first to fourth pulse power sources are placed at the head of the ferromagnetic object, and the first to fourth One pole of the pulse power supply is respectively connected to the head end surface of the ferromagnetic object through cables, and the other poles of the first to fourth pulse power supplies are respectively connected to the tail end surface of the ferromagnetic object through the first to fourth cables. The two cables are respectively located on the upper left side and the upper right side of the ferromagnetic object along the...

Embodiment 3

[0037] Embodiment 3, a 20,000-ton ferromagnetic ship, width b=20m, height h=20m, the vertical component Hz=30A / m of the local geomagnetic field, Hp=20A / m, realize overall demagnetization, including the following step:

[0038] (1) Steps for laying cables: figure 1 , figure 2 As shown, place a ferromagnetic object with a width of b=20m and a height of h=20m along its axial direction in the geomagnetic east-west direction, place the first to fourth pulse power sources at the head of the ferromagnetic object, and place the first to fourth One pole of the pulse power supply is respectively connected to the head end surface of the ferromagnetic object through cables, and the other poles of the first to fourth pulse power supplies are respectively connected to the tail end surface of the ferromagnetic object through the first to fourth cables. The two cables are respectively located on the upper left side and the upper right side of the ferromagnetic object along the axial direct...

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Abstract

A ferromagnetic object demagnetizing method belongs to the technical field of demagnetizing and solves the problem of time and labor wasting of existing ferromagnetic object demagnetizing methods. The ferromagnetic object demagnetizing method includes: (1) the cable paving step: axially disposing ferromagnetic objects in the eastern and western direction of terrestrial magnetism, disposing a first pulse power source, a second pulse power source, a third pulse power source and a fourth pulse power source at the head end of the ferromagnetic object in a manner that one electrodes of the four pulse power sources are connected with the head end faces of the ferromagnetic objects and the other electrodes of the four pulse power sources are connected with tail end faces of the ferromagnetic objects through a first cable, a second cable, a third cable and a fourth cable respectively; (2) the powering and demagnetizing step: powering the four cables with pulse current i1 to i4 which laps direct-current components on alternating-current components by the four pulse power sources synchronously. By the ferromagnetic object demagnetizing method, cable coils are omitted, labor intensity of workers can be reduced, demagnetizing time is shortened, expenditure is saved, demagnetizing effect is fine, energy consumption is low, and the demagnetized ferromagnetic objects are easy to be maneuvered on the special conditions. Besides, the ferromagnetic object demagnetizing method is particularly applicable to demagnetizing treatment for a great quantity of ferromagnetic objects when in emergency.

Description

technical field [0001] The invention belongs to the technical field of degaussing, and in particular relates to a method for demagnetizing a ferromagnetic object, which directly energizes the ferromagnetic object to eliminate the permanent magnetism of the ferromagnetic object without winding a coil. Background technique [0002] In the technical fields such as machinery manufacturing and shipbuilding, it is often necessary to demagnetize ferromagnetic objects. At present, the widely used method is to wind demagnetization coils on ferromagnetic objects to demagnetize ferromagnetic objects. The demagnetization cable constitutes the demagnetization coil, which is particularly time-consuming and labor-intensive. For example, for a ferromagnetic ship of about 1,800 tons to demagnetize, it will take 3 to 5 days for each ship, and because the ferromagnetic ship is bound by cables during demagnetization, it is difficult to maneuver in an emergency, which is very dangerous ; During...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F13/00
Inventor 郭成豹刘大明肖昌汉洪泽宏唐申生刘胜道赵文春高俊吉
Owner NAVAL UNIV OF ENG PLA
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