JP2010249583A - Magnetization display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for detecting magnetization generated on a steel material by works causing a strong magnetic force, such as welding works. <P>SOLUTION: A magnetization detection device 10 includes: a geomagnetic sensor 30 which measures the geomagnetism before works; a reference value retaining circuit 31 which records the intensity of the geomagnetism measured by the geomagnetic sensor 30; a magnetic sensor 21 which measures the magnetism after the works; a reference value comparator 22 which compares the intensity of the geomagnetism recorded in the reference value retaining circuit 31 with the magnetism measured by the magnetic sensor 21; and an LED display part which makes issuance to a predetermined color based on the comparison result by the reference value comparator 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an apparatus for displaying magnetization by welding work or the like.

  Conventionally, for example, as shown in FIG. 4, in order to apply a fireproof coating to the steel frame 200 on the back of the ceiling, a fireproof coating sheet material 210 or the like is pinned to the steel frame 200 by welding, and a welding machine 250 is used. It is installed on the floor and the welding cable 230 is extended from the welding machine 250 to the welding location to perform a welding operation. For this reason, when a DC welding machine is used as the welding machine 250, a strong magnetic field is generated around the welding cable 230 due to a large DC current flowing through the welding cable 230 during welding, and a nearby steel frame, metal furniture, or the like is generated by this magnetic field. May become magnetized.

  When such magnetization occurs, a failure occurs in a device using an electron beam, such as a television, a CRT, or an electron microscope. For this reason, it is necessary to demagnetize by detecting a magnetized portion using a magnetic sensor after performing a welding operation or the like.

  In addition, as invention using a magnetic sensor, the apparatus (refer patent documents 1-3) which detects the piston position in a cylinder, The apparatus for detecting the position of the wiring box concealed on the back surface of a wall material ( Patent Document 4).

JP 11-311214 A Japanese Examined Patent Publication No. 7-39925 Japanese Patent Publication No. 6-19164 Japanese Patent No. 3866442

  However, each of the above devices is a device for embedding a magnet in a member whose position is to be detected and detecting the magnetic field by this magnet, and does not detect the distribution of the magnetic field due to magnetization. . Then, an object of this invention is to provide the apparatus for detecting the magnetization which arose in steel materials etc. by the operation | work which generate | occur | produces a strong magnetic force, such as a welding operation.

  A magnetization display device of the present invention is a magnetization display device that displays a magnetization state of a magnetization detection target, and records a geomagnetism sensor that measures geomagnetism and a geomagnetism intensity measured by the geomagnetism sensor. Comparing the recording means, the plurality of magnetic sensors for measuring the magnetism of the magnetization detection target, the intensity of the magnetism measured by each of the plurality of magnetic sensors, and the intensity of the geomagnetism recorded in the recording means Corresponding to each of the plurality of magnetic sensors, and provided in a positional relationship according to the arrangement of the plurality of magnetic sensors, or according to the comparison result by the comparison unit for the corresponding magnetic sensor or A plurality of light emitting means for emitting light with intensity are integrated.

  In the above-described magnetization display device, a plurality of the magnetic sensors may be arranged in a lattice form in the vertical and horizontal directions, or may be arranged in a straight line.

  According to the present invention, the magnetic field strength by the geomagnetism measured by the geomagnetic sensor before the work in which a strong magnetic force is generated is recorded, and compared with the magnetic field strength measured by the magnetic sensor after the work, If the strengths are different, it can be determined that magnetization has occurred.

(A) is a perspective view which shows the structure of the magnetization detection apparatus of this embodiment, (B) is a circuit diagram. (A) is a figure which shows the magnetization detection apparatus when the magnetization has not arisen, (B) is a figure which shows the magnetization detection apparatus when the magnetization has arisen. It is a figure which shows the structure of the magnetization detection apparatus at the time of setting it as the structure which provides a some housing | casing in a long housing | casing. It is a figure which shows a mode that a welding operation is performed.

  Hereinafter, an embodiment of a magnetization detection device of the present invention will be described with reference to the drawings. FIG. 1A is a perspective view showing a configuration of a magnetization detection device 10 of the present embodiment, and FIG. 1B is a circuit diagram. As shown in the figure, the magnetization detection device 10 according to the present embodiment includes a plurality of sensor units 20 arranged in a grid pattern in a vertical and horizontal manner accommodated in a casing 11 having a grip portion 12, and a geomagnetic sensor 30. And a reference value holding circuit 31 and a switch 32.

  The wiring extending from the reference value holding circuit 31 is provided with a switch 32. By switching the switch 32, the reference value holding circuit 31 and the geomagnetic sensor 30 are connected, and the reference value holding circuit 31 will be described later. The state in which the reference value comparator 22 of each sensor unit 20 is connected can be switched.

  The geomagnetic sensor 30 includes, for example, a Hall element, and outputs a voltage corresponding to the intensity of the magnetic field in the vertical direction of the magnetization detection device 10.

  When the reference value holding circuit 31 is connected to the geomagnetic sensor 30 by switching the switch 32, the reference value holding circuit 31 detects the output voltage of the geomagnetic sensor 30 and records the value in the memory. When the reference value holding circuit 31 is connected to the reference value comparator 22 of the sensor unit 20 by switching the switch 32, the reference value holding circuit 31 generates a voltage having a value recorded in the memory. Specifically, the above function can be realized, for example, by AD converting the output voltage of the geomagnetic sensor 30, recording a digital value in a memory, DA converting the recorded digital value, and outputting the analog output.

  The sensor unit 20 includes a reference value comparator 22, a magnetic field sensor 21, and an LED display unit 23. The magnetic field sensor 21 is attached to the lower surface of the housing 11, and the LED display unit 23 is attached to the upper surface of the housing 11.

The magnetic field sensor 21 is composed of, for example, a Hall element, and outputs a voltage corresponding to the intensity of the magnetic field in the vertical direction of the magnetization detection device 10. The magnetic field sensor 21 and the geomagnetic sensor 30 have the same characteristics (output voltage characteristics with respect to the magnetic field strength).
When the reference value comparator 22 and the reference value holding circuit 31 are connected by switching the switch 32, the reference value comparator 22 detects the voltage difference between the voltage output from the magnetic field sensor 21 and the voltage generated by the reference value holding circuit 31. Is transmitted to the LED display unit 23.

  The LED display unit 23 includes, for example, a three-color (RGB) LED and a control unit that drives and controls the LED, and the control unit can emit light in a plurality of hues by appropriately emitting these LEDs. The control unit of the LED display unit 23 includes a table indicating a correspondence relationship between the voltage difference and the hue corresponding to the value, and the voltage indicated by the signal received from the reference value comparator 22 with reference to this table. The LED emits light with a hue corresponding to the difference. Specifically, for example, light is emitted in different hues such as blue when the voltage difference is 0, red when the voltage difference is +, and green when the voltage difference is −. In this way, by causing the LED to emit light with a hue corresponding to the voltage difference, it is possible to display the intensity of the magnetic field generated by magnetization without the influence of geomagnetism.

Hereinafter, a method for determining whether or not magnetization has occurred by performing a welding operation and detecting a magnetized portion by using the magnetization detection device 10 will be described. In the present embodiment, a case where the presence / absence of magnetization generated in a steel material under the floor by welding work is determined will be described as an example.
First, prior to the welding operation, the geomagnetism in a state where magnetization is not generated is measured. That is, the switch 32 is switched to a state in which the geomagnetic sensor 30 and the reference value holding circuit 31 are connected while the magnetization detection device 10 is held horizontally. Thereby, the geomagnetic sensor 30 generates a voltage corresponding to the vertical geomagnetism, and the reference value holding circuit 31 records this voltage value.
When the switch 32 is switched to the state where the reference value comparator 22 and the reference value holding circuit 31 are connected, the reference value holding circuit 31 has a value corresponding to the geomagnetism at that time, that is, before the welding operation. Is recorded.
And welding work is performed in this state.

  After completion of the welding operation, the magnetization detection device 10 is horizontally installed at a position where the magnetization on the floor should be determined. Here, since the indoor magnetic field does not change when magnetization is not generated, each magnetic sensor 21 detects a magnetic field having the same strength as the geomagnetism measured by the geomagnetic sensor 30 before the welding operation. The Further, when magnetization is generated, magnetism due to magnetization acts in addition to geomagnetism. Therefore, each magnetic sensor 21 detects a magnetic field in which the geomagnetism and the magnetized magnetism are combined. The corresponding voltage is output.

  As described above, each reference value comparator 22 transmits a signal corresponding to the difference between the voltage generated by the magnetic sensor 21 and the voltage recorded in the reference value holding circuit 31 to the LED display unit 23.

  Each LED display unit 23 emits light in a preset hue according to the signal received from the corresponding reference value comparator 22. Based on the color emitted by the LED display unit 23 and its distribution, it is possible to detect the presence / absence of magnetization and the magnetized portion from which the influence of geomagnetism has been removed. That is, as shown in FIG. 2A, when all the LED display portions 23 emit blue light, the welding work and the welding work are performed within the range measured by the magnetization detection device 10. It can be determined that the subsequent magnetic field has not changed and magnetization has not occurred. As shown in FIG. 2B, when there is an LED display unit 23 that emits red or green light, a detection site of the magnetic sensor 21 corresponding to the LED display unit 23 (that is, the LED display unit 23). It is possible to determine that magnetization has occurred in the lower part of FIG.

  When it is determined that magnetization has occurred in this way, demagnetization is performed on the steel material on which magnetization has occurred. Thereby, it is possible to prevent the influence on peripheral electronic devices and the like. In addition, what is necessary is just to observe the light emission state of the LED display part 23, moving the magnetization detection apparatus 10, when measuring magnetization in a wider range than the measurement range by the magnetization detection apparatus 10. FIG.

  As described above, according to the present embodiment, a voltage corresponding to the strength of the geomagnetism measured by the geomagnetic sensor 30 before the welding operation is held by the reference value holding circuit 31, and the magnetic field measured by the magnetic sensor 21 after the welding operation. The presence / absence of magnetization and the magnetized part can be detected by comparing with the voltage according to the intensity of the magnetic field.

  In addition, by providing a plurality of sensor units 20 vertically and horizontally in the horizontal direction, it is possible to specify a location where magnetization within the range to be measured occurs.

  Furthermore, since the LED display unit 23 emits light with a color corresponding to the voltage difference, the magnetized portion can be visually confirmed.

  In the present embodiment, the plurality of sensor units 20 are arranged in a grid pattern. However, the present invention is not limited to this, and the plurality of sensor units 20 are provided in a long case 111 as shown in FIG. It is good also as a structure. When the magnetization detection device 110 having such a configuration is used, the geomagnetism measurement before the welding operation is performed in the same manner as in the above embodiment. Then, when the presence / absence of magnetization and the location of magnetization are detected after the welding operation, the sensor units 20 are horizontally moved in the vertical direction and the direction in which the sensor units 20 are arranged while the magnetization detection device 110 is held horizontally. When the magnetization detection device 110 passes through the upper part of the part where magnetization is not generated, each LED display unit 23 emits red light. The display unit 23 emits blue or green light. Thereby, the presence or absence of magnetization and the detection of a magnetization location can be performed.

  Further, in the present embodiment, the case of detecting the presence or absence of magnetization of the steel material under the floor has been described, but if there is a possibility of magnetism such as an iron desk, the presence or absence of magnetization and the detection of the magnetization location are detected. It becomes a target.

  Further, in the present embodiment, the case where the magnetization by the welding operation is detected has been described. However, the present invention is not limited to this, and the construction member is magnetized by an operation that generates a strong magnetic force such as a lifting operation using a lifting magnet. It is also possible to detect.

In the present embodiment, the strength of the magnetic field in the vertical direction before and after the welding operation is compared, and the presence or absence of magnetization in the steel material under the floor is detected, but not limited to this, the strength of the magnetic field in the horizontal direction is determined. In comparison, it is also possible to detect the presence or absence of magnetization of the steel material of the beam or column.
In the present embodiment, the LED display unit 23 displays the voltage difference with the associated hue. However, the present invention is not limited to this, and the voltage difference and the emission intensity are associated with each other, and the voltage difference is determined according to the emission intensity. May be displayed.

  In the present embodiment, Hall elements are used as the magnetic sensor 21 and the geomagnetic sensor 30. However, the present invention is not limited to this, and a magnetoresistive element, a flux gate, or the like may be used. Any sensor that outputs a physical quantity according to the above can be used. In the present embodiment, the voltages at the magnetic sensor 21 and the geomagnetic sensor 30 are compared by the reference value comparator 22, but the present invention is not limited to this. For example, a physical quantity corresponding to the intensity of the magnetic field such as a current value is compared. It may be a thing. Further, the magnetic field strength value measured by the geomagnetic sensor 30 may be directly compared with the magnetic field strength value measured by the magnetic sensor 21 after welding.

  In the present embodiment, the magnetic sensor 21 and the geomagnetic sensor 30 used to measure a magnetic field only in one direction (vertical direction). However, the present invention is not limited to this, and the magnetic field is measured two-dimensionally or three-dimensionally. A magnetic sensor and a geomagnetic sensor may be used. As described above, when observing magnetic fields in a plurality of directions, the LED display unit 23 may be configured to be switchable so that observation results in each direction can be displayed.

DESCRIPTION OF SYMBOLS 10, 110 Magnetization detection apparatus 11, 111 Housing | casing 12 Grasp part 20 Sensor unit 21 Magnetic sensor 22 Reference value comparator 23 LED display part 30 Geomagnetic sensor 31 Reference value holding circuit 32 Switch

Claims (3)

A magnetization display device for displaying a magnetization state of a magnetization detection target,
A geomagnetic sensor for measuring geomagnetism,
Recording means for recording the intensity of geomagnetism measured by the geomagnetic sensor;
A plurality of magnetic sensors for measuring the magnetism of the magnetization detection target;
Comparison means for comparing the intensity of magnetism measured by each of the plurality of magnetic sensors with the intensity of geomagnetism recorded in the recording means;
Corresponding to each of the plurality of magnetic sensors, a plurality of light sources that are provided in a positional relationship according to the arrangement of the plurality of magnetic sensors and that emit light with colors or intensities according to the comparison results by the comparison means for the corresponding magnetic sensors. A magnetized display device, wherein the light emitting means is integrated. The magnetized display device according to claim 1,
The magnetized display device, wherein the plurality of magnetic sensors are arranged vertically and horizontally in a grid pattern. The magnetized display device according to claim 1,
The magnetized display device, wherein the plurality of magnetic sensors are arranged in a straight line.