JPH09113333A - Molten metal level measuring equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize highly accurate measurement by disposing a molten metal interface detection coil farther rearward than the forward end of an immersion molten metal probe made of a paper tube. SOLUTION: A molten metal interface detection coil 2 is interposed between a molten metal temperature measuring unit 4 and a molten metal sampling case 3 in a probe body 1 made of a paper tube. The unit 4 is applied with a metal cap 5 for protecting the unit 4 against thermal and mechanical impact at the time of immersion. In order to prevent the coil 2 from capturing the flux from the cap 5 or case 3, they are spaced apart by about 5mm or more. A coil 2 having ferrite core is employed, for example, and the number of turns is decreased. It is arranged in parallel with the surface of molten metal and the flux density is increased in the direction of molten metal in order to enhance the detection sensitivity. Since the probe body 1 made of paper tube exhibits high thermal insulation and does not disturb the flux, highly accurate measurement can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to provide a molten metal level measuring device for measuring a molten metal level (which may or may not be equipped with various functions such as temperature measurement of molten metal and sampling). Is.

[0002]

2. Description of the Related Art Conventionally, as a device for measuring the level of molten metal, there is a device in which an electrode is arranged at the tip of a rod-shaped body and the level is measured by short-circuiting the electrode. Further, there is also one in which a dissimilar metal wire forming a thermocouple is formed in a coil shape and arranged at the tip of a rod-shaped body. Further, there is also a probe holder for immersing the molten metal probe in the molten metal, which is provided with a detecting means by magnetic field fluctuation.

[0003]

However, in the case where the electrode is arranged at the tip of the rod-shaped body, the molten metal interface is not always quiet, but is rippling, and a splash phenomenon of the molten metal called splash occurs. Therefore, in such an environment, the molten metal scattered by the splash adheres to the electrode before the immersion and short-circuits at that time to cause a malfunction of not detecting a desired molten metal level at all. Further, in the case where the thermocouple wire is formed in a coil shape, not only the above-mentioned malfunction occurs but also the temperature sensor serves as a temperature sensor, which requires extremely high accuracy in terms of manufacturing accuracy, which causes difficulty in processing. On the other hand, in the probe holder for immersing the molten metal probe in the molten metal and the detecting means by the magnetic field variation is configured, even if the position where the detecting means is arranged is the tip of the holder, the probe is not immersed in the probe. For example, the detection means cannot detect unless the probe is soaked in the molten metal to the rear, so there is a problem that the immersion depth must be increased. In addition, since the holder is made of metal, the detection means catches the magnetic flux of the metal, so that there is a problem that production is complicated, such as processing for improving accuracy such as large shaving and opening of the vicinity of the detection means, resulting in expensive equipment. There's a problem.

[0004]

In view of the above problems, in order to achieve the object of the present invention, a coil for detecting a molten metal interface is arranged inside the vicinity of a rear end of an immersion type molten metal probe made of a paper tube. The present invention proposes a molten metal level measuring device characterized by the above.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The molten metal level measuring apparatus of the present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 shows an apparatus of the present invention, which is a coil (2) for detecting a molten metal interface in a probe body (1) made of a paper tube for detecting by fluctuation of a magnetic field.
Place. In the present embodiment, as another function, the one equipped with the molten metal sampling container (3) and the molten metal temperature measuring device (4) is shown as an actual example in which a probe of this type is coiled. Is often worn. Therefore, in the present embodiment, the molten metal interface detection coil (2) is arranged between the molten metal temperature measuring device (4) and the molten metal sampling container (3). Usually, a metal cap (5) is attached to the outer circumference of the molten metal temperature measuring device (4) to protect the temperature measuring device (4) from thermal shock and mechanical shock during immersion. In this case, the molten metal interface detection coil may catch the magnetic flux of the metal cap (5), or if the molten metal sampling container (3) is made of metal, it may catch the magnetic flux and cause malfunction. The position of the coil for detecting molten metal interface (2) is preferably at least 5 mm away from the molten metal temperature measuring device (4) or the molten metal sampling container (3). On the other hand, the molten metal interface detection coil (2) can be wound less by using a core type. Further, since it is arranged horizontally with respect to the surface of the molten metal, the magnetic flux density becomes higher in the direction of the molten metal, the detection sensitivity is increased, and the magnetic flux can be accurately captured. In the core of the coil, it is preferable to use ferrite because it does not magnetize itself or retain the magnetism due to long-term use. Since the molten metal interface detection coil (2) of the present invention is small and of a coil type, the size can be freely changed, and therefore its location and the like are not limited. FIG.
Shows another apparatus according to the present invention, in which the molten metal sampling container (3) and the molten metal temperature measuring apparatus (4) of FIG. 1 are omitted. That is, the apparatus is equipped with the molten metal interface detection coil (2) and measures only the molten metal level.

[0005]

According to the molten metal level measuring apparatus of the present invention, since the coil is arranged in the immersion type molten metal probe consisting of a paper tube, the heat insulating effect is high and the magnetic flux is not greatly detected, so that accurate measurement can be performed. . Further, since the tip end portion inside the probe is arranged so as not to be adjacent to other metal members, the molten metal interface can be suitably detected by immersing the probe in the required minimum amount in the molten metal. On the other hand, when the coil is placed horizontally with respect to the molten metal interface, the magnetic flux can be widely captured in the dipping direction, so that the accuracy is further improved.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of an apparatus of the present invention.

FIG. 2 is a conceptual diagram of another device of the present invention.

[Explanation of Codes] Probe body 2. Coil for detecting molten metal interface 3. Molten metal sampling container 4. Molten metal temperature measuring device 5. Metal cap

Claims (2)

[Claims] 1. An apparatus for measuring a level of molten metal, wherein a coil for detecting a molten metal interface is arranged inside a portion slightly rearward of a tip of an immersion type molten metal probe made of a paper tube. 2. The molten metal level measuring device according to claim 1, wherein the molten metal interface detecting coil is arranged horizontally with respect to the immersion surface.