JP6015288B2 - Measuring sensor and steel plate processing apparatus - Google Patents

Description

  The present invention relates to a measurement sensor for measuring magnetism used in a continuous casting machine, a hot rolling mill, and the like, and a steel plate processing apparatus including the same.

  In the manufacturing industry such as the steel industry, the measurement of magnetism in a high temperature environment is widely performed. Specifically, the applied magnetic field monitoring and flow state measurement in a continuous casting machine. Among such magnetic measurements, particularly when it is necessary to measure a magnetic field in the vicinity of molten steel or a high-temperature steel plate, measures for preventing failure of the measurement sensor are required.

  In addition, a Hall element is generally used for magnetic measurement. However, since the Hall element is made of a semiconductor element, it has low heat resistance and cannot withstand high temperatures. Specifically, the operation guarantee temperature of the Hall element using gallium arsenide (GaAs) is about −40 ° C. to 125 ° C. For this reason, if the Hall element using GaAs is exposed to a high temperature atmosphere of 125 ° C. or higher, the Hall element may break down.

  In general, a coil is also used for magnetic measurement. Even when a coil is employed as a measurement sensor for this magnetic measurement, the coil may be subject to deterioration of the characteristics due to short-circuiting or burning due to deterioration of the insulating film when exposed to high temperatures.

  Therefore, in general, a measuring sensor used in a high temperature atmosphere employs a method of protecting under high temperature conditions by cooling. As the simplest cooling method, there is a method using a double pipe such as a so-called water cooling jacket in which a region through which liquid passes is provided outside the sensor and cooling water is circulated in this region to cool the sensor. A sensor for measurement employing such a double tube is widely used.

  Further, in Patent Document 1, the measurement sensor is water-cooled, and the amount of cooling water for cooling the measurement sensor and the amount of cooling water sent to the cooling nozzle can be individually adjusted. The configuration is described.

JP 2004-205382 A

  However, even if a water-cooled measurement sensor as described in Patent Document 1 is adopted, it may be difficult to route the cooling water when the space for mounting the measurement sensor is small. Specifically, when the space where the sensor can be attached is several cm or less, as represented by the vicinity of the mold in the continuous casting machine, the gap between the segment rolls, or the gap between the rolls in the tandem rolling mill, It becomes difficult to manage.

  In addition, if a measurement sensor with a cooling water pipe is used, the sensor head becomes too large to be installed at the desired position, or damage may occur due to interference with existing equipment or structures. It is possible to do. For example, if a measurement sensor is caught in a roll or the like, not only the failure of the sensor but also a serious trouble such as product breakage or roll damage is caused.

  Further, in the method of cooling the measurement sensor using the cooling water, the piping for passing the cooling water and the space for cooling the sensor may be clogged with dust or sludge contained in the cooling water. If the flow of cooling water stops or the flow rate decreases due to the occurrence of this clogging, the measurement sensor may be exposed to high temperatures and break down.

  The present invention has been made in view of the above, and an object thereof is to provide a measurement sensor that has excellent heat resistance and can maintain a cooling state efficiently with a simple configuration even in a high-temperature atmosphere, and the same. It is to provide a steel plate processing apparatus.

  In order to solve the above-described problems and achieve the above-described object, a measurement sensor according to the present invention includes a sensor element configured to be able to measure magnetism, and a casing that transmits electromagnetic and holds the sensor element inside. And a covering material which is provided at least in a region where heat can be transmitted from the sensor element and which transmits electromagnetic waves and has hygroscopicity.

  The measurement sensor according to the present invention is characterized in that, in the above invention, the sensor element is a coil or a Hall element.

  The measurement sensor according to the present invention is characterized in that, in the above invention, the covering material is made of glass wool or a porous material having voids.

  A steel plate processing apparatus according to the present invention is configured to be capable of measuring magnetism and cooling means configured to be able to inject a cooling liquid for cooling a steel plate in a steel plate processing apparatus that performs a predetermined process on a heated steel plate. And a covering material that can absorb and hold the cooling liquid sprayed from the cooling means and transmit the electromagnetic wave from the sensor element. And a measuring sensor provided in a heatable region.

  The steel plate processing apparatus according to the present invention is characterized in that, in the above invention, the steel plate processing apparatus is a continuous casting machine or a hot rolling mill.

  According to the measurement sensor and the steel sheet processing apparatus according to the present invention, it has a simple structure and excellent heat resistance, and can be used in the vicinity of a cooling means for injecting a cooling liquid to efficiently maintain a cooling state even in a high temperature atmosphere. A sensor can be obtained.

FIG. 1 is a schematic diagram showing a peripheral portion of a measurement sensor and a measurement sensor of a steel sheet processing apparatus according to an embodiment of the present invention. FIG. 2 is a graph showing the temperature change at the tip of the measurement sensor according to the prior art. FIG. 3 is a graph showing a temperature change at the tip of the measurement sensor according to the embodiment of the present invention. FIG. 4 is a graph showing details of the temperature change at the tip of the measurement sensor when the slab is removed in FIGS. 2 and 3.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Further, the present invention is not limited to the embodiment described below.

  First, in order to facilitate understanding of the present invention, an intensive study conducted by the present inventor to solve the above-described problems will be described. That is, the present inventor has considered that a small sensor element provided in a measurement sensor for magnetic measurement in the prior art may fail due to radiant heat from a heated steel plate (slab). The method of cooling was investigated earnestly. First, in order to cool the sensor element, the present inventor studied a method of cooling the sensor element by providing a cooling element for cooling the sensor element and a cooling water pipe for supplying cooling water to the measurement sensor. However, as described above, in this case, there is a problem that the measurement sensor is enlarged and a place where the measurement sensor can be installed is limited, and the measurement sensor cannot be installed at a desired place.

  Then, this inventor paid attention to the point which is injecting cooling water from the cooling spray nozzle in order to cool the heated slab in steel plate processing apparatuses, such as a continuous casting machine and a hot rolling mill. This cooling water is usually used to cool the surface of the slab, but the present inventor has recalled that the cooling water is actively used for cooling the sensor elements of the adjacent measuring sensors.

  If the sensor element that is most likely to fail due to thermal radiation from the slab can be directly cooled by the cooling water, it is not necessary to provide a new configuration such as a cooling element or a cooling water pipe in order to cool the sensor element. Further, if a configuration in which the sensor element is directly cooled using cooling water is employed, the sensor element can be protected from high radiant heat even in a high temperature environment, and there is no problem in the operation of measuring magnetism.

  However, in practice in the steel sheet processing apparatus, in practice, the injection of cooling water from the cooling spray nozzle may be systematically stopped. The stop of the cooling water will be specifically described by taking an example of casting with a continuous casting machine.

  That is, at the time of steady casting in the continuous casting machine, the surface of the slab is cooled by jetting cooling water from the cooling spray nozzle to the slab. During this time, the sensor element of the measurement sensor installed near the slab can be cooled using this cooling water. However, at the moment when the casting of the slab is completed and the slab top on the upper surface of the slab comes out of the mold, the upper surface of the slab is not cooled by the mold and the molten steel is exposed. When cooling water is sprayed on the slab top, an extremely large amount of water vapor is generated so that the molten steel and the cooling water come into contact with each other and hinder the operation. Therefore, when the slab top exits the mold, the injection of the cooling water from the cooling spray nozzle is stopped.

  When the injection of the cooling water from the cooling spray nozzle is stopped in this way, the measurement sensor that has been cooled using the cooling water is not cooled, and receives the radiant heat from the slab and the temperature at the tip of the slab side of the measurement sensor. Rises rapidly. In addition, even in a hot rolling mill other than the continuous casting machine, the injection of cooling water may stop despite the presence of a high-temperature body heated by cooling pattern control or the like.

  Therefore, the present inventor has re-examined a method for continuously cooling the sensor element at the tip of the measurement sensor even when the cooling water injection is stopped when the slab top comes out of the mold, that is, when the so-called slab is removed. In order to continue cooling the tip of the measurement sensor even when the slab is removed, it was recalled that it is desirable to hold the cooling water in the portion where the sensor element of the measurement sensor is present when the slab is removed.

  That is, if the sensor element in the measurement sensor receives radiant heat while holding the cooling water, the held cooling water is rapidly vaporized, and the sensor element is cooled mainly by the latent heat of vaporization. The increase in heat capacity due to the retained cooling water is considered to have a certain contribution, but considering that the specific heat of water is 4.2 J / g · K and the latent heat of vaporization is 2.2 kJ / g, It is thought that the latent heat of vaporization has a greater contribution to

  Therefore, the present inventor can absorb a cooling liquid for cooling a slab sprayed from an existing cooling spray nozzle in a steel plate processing apparatus at least in a sensor element portion of the measurement sensor, and also has a magnetic measurement function. As a result, it has been conceived to provide a coating material that does not impair. The present invention has been devised based on the above-mentioned earnest studies.

  Next, a measurement sensor according to an embodiment of the present invention devised as described above will be described. FIG. 1 shows a measurement sensor according to this embodiment and a peripheral portion of the measurement sensor in a steel sheet processing apparatus in which the measurement sensor is installed.

  As shown in FIG. 1, the measurement sensor 10 according to this embodiment includes a sensor element 1, a wiring 2, a metal sheath 3, and a hygroscopic coating material 4. The sensor element 1 is composed of a sensor element for magnetic measurement such as a hall element or a coil. It is also possible to use sensor elements other than magnetic measurement. The wiring 2 is used for extraction of a detection signal by the sensor element 1 and electrical connection with a drive power supply (not shown). The metal sheath 3 as a housing is made of a nonmagnetic metal such as copper or stainless steel (SUS) that transmits electromagnetic waves. The shape of the metal sheath 3 is, for example, a cylindrical shape or a quadrangular prism shape whose cross section perpendicular to the longitudinal direction is circular or square. The distal end side of the metal sheath 3 is in a sealed state in which the sensor element 1 is held inside and can be protected from external force.

  The hygroscopic coating material 4 as a coating material according to this embodiment is made of a non-magnetic material that transmits electromagnetic waves, and a hygroscopic material that can absorb liquid and hold the liquid inside. The hygroscopic coating material 4 is made of, for example, a porous refractory material that does not melt or burn up to a temperature of 300 ° C. or higher, preferably about 500 ° C., more preferably about 1000 ° C. Specifically, the hygroscopic coating material 4 is made of, for example, a glass tape or a seratec tape having a thickness of about 1 to 3 mm such as a porous material having voids or glass wool that is substantially porous. Further, the hygroscopic covering material 4 uses, for example, a heat-resistant adhesive or a wire in a region where heat can be transferred from at least the sensor element 1 at the distal end portion of the metal sheath 3, preferably in a region covering the sensor element 1. To be fixed. The hygroscopic covering material 4 may be configured to cover not only the distal end portion of the metal sheath 3 but also the whole.

  The measuring sensor 10 configured as described above is installed in a steel plate processing apparatus such as a conventionally known continuous casting machine or hot rolling mill. And the sensor 10 for a measurement is comprised so that installation in the position close | similar to the high temperature bodies 5, such as a cast slab and a hot-rolled sheet, which became high temperature by being heated. Further, the design of the region covered by the hygroscopic covering material 4 in the measurement sensor 10 can be changed as appropriate even based on the positional relationship between the high temperature body 5 and the measurement sensor 10.

  The steel plate processing apparatus is provided with a cooling spray nozzle 6 as a cooling means. The cooling spray nozzle 6 sprays the cooling liquid 7 as, for example, a cooling spray or a cooling mist in order to cool the surface of the high temperature body 5 such as a slab that has been heated to a high temperature. And as shown in FIG. 1, the installation position of the sensor 10 for a measurement is the cooling spray nozzle 6 vicinity, for example near the rolling roll (not shown) etc. which are provided in a steel plate processing apparatus. Thereby, since the measuring sensor 10 is installed in an environment where the cooling liquid 7 exists, the hygroscopic covering material 4 can absorb the cooling liquid 7 sprayed from the cooling spray nozzle 6 and hold it inside. When the hygroscopic coating material 4 absorbs and holds the cooling liquid 7, the sensor element 1 is cooled at least in a portion covered with the hygroscopic coating material 4 due to latent heat of vaporization of the cooling liquid 7. The measurement sensor 10 measures a magnetic field by being close to a high temperature body 5 such as a cast slab, a hot rolled plate, or a thick plate material at a distance of, for example, about several centimeters.

  Thus, by using the cooling liquid 7 ejected from the existing cooling spray nozzle 6 existing in the vicinity of the high temperature body 5 for cooling the sensor element 1, a cooling water pipe or the like is provided for cooling the sensor element 1. There is no need to install a new one. And since such a cooling water piping is unnecessary, the small sensor 10 for a measurement is obtained and it becomes advantageous in terms of maintainability. Further, since the cooling liquid 7 having a large latent heat of vaporization such as water is used, even if the cooling liquid 7 held in the hygroscopic coating material 4 is small, it acts on the sensor element 1 very effectively.

  Next, the tip of the measurement sensor in the case where the measurement sensor 10 according to the embodiment configured as described above is used and in the case where the conventional measurement sensor which does not include the hygroscopic coating material 4 is used. The temperature change of the part will be described. For comparison, as a conventional measurement sensor and its peripheral part, a sensor having the same configuration is adopted except that the hygroscopic coating material 4 is not provided in the measurement sensor 10 according to the embodiment. For this reason, the reference numerals shown in FIG. 1 are also used in the description of the conventional measurement sensor and its peripheral portion.

  FIG. 2 and FIG. 3 are graphs showing time transitions of temperature changes including the conventional measurement sensor 10 and the tip of the measurement sensor 10 according to one embodiment during casting in the steel sheet processing apparatus and including slab removal. . The temperature was measured at the installation position of the measurement sensor 10 by providing a thermocouple inside a metal sheath (not shown) of the same shape and the same material as the metal sheath 3 shown in FIG.

  From FIG. 2, in the steady state during casting, since the cooling liquid 7 is sprayed from the cooling spray nozzle 6 of the steel sheet processing apparatus, the temperature at the tip of the measurement sensor 10 is stable at about 60 ° C. . On the other hand, since the injection of the cooling liquid 7 stops when the slab is removed, it can be seen that the temperature at the tip of the measurement sensor 10 rapidly increases to a temperature exceeding 200 ° C. In addition, when this inventor observed the temperature of the front-end | tip part of the sensor 10 for measurement at the time of slab removal | decompression for a long period of time, it was confirmed that it reaches to about 300 degreeC at the maximum.

  On the other hand, from FIG. 3, in the steady state during casting, the temperature at the tip of the measurement sensor 10 is stable at about 60 ° C., as in the case of the conventional measurement sensor 10 shown in FIG. Recognize. Further, it can be seen that the temperature at the tip of the measurement sensor 10 rises when the slab is removed, but the temperature does not reach 90 ° C. but reaches about 80 ° C. That is, it can be seen that the measurement sensor 10 according to this embodiment has a remarkable temperature rise suppressing effect as compared with the conventional measurement sensor 10 shown in FIG. This is because the tip of the measurement sensor 10 is cooled by the cooling liquid 7 that is injected from the cooling spray nozzle 6 and absorbed by the hygroscopic coating material 4 during casting, and the hygroscopic coating material 4 is removed when the slab is removed. This is because it is cooled by the latent heat of vaporization of the cooling liquid 7 that is held. In addition, if it is about 80 degreeC, it will not become a problem on the operation | movement of the magnetic measurement by the Hall element and coil which comprise the sensor element 1. FIG.

  Further, FIG. 4 shows a measurement example of the temperature change when the slab is removed shown in the dotted line box in FIG. 2 (conventional example), and a measurement example of the temperature change when the slab is dropped shown in the dotted line box in FIG. Fig. 5 is a graph showing the measurement time in more detail. From FIG. 4, it can be seen that in the conventional measurement sensor 10, the temperature is rapidly increased and decreased between about 80 ° C. and 220 ° C. for 50 to 200 s. That is, it can be seen from FIG. 4 that the conventional measurement sensor 10 is heated to a high temperature at a very high temperature increase rate and then cooled at a very high temperature decrease rate. This is a very rapid temperature change that causes a failure in the sensor element 1 having low heat resistance. On the other hand, in the measurement sensor 10 according to this embodiment, it can be seen that the temperature hardly fluctuates, and any of the temperature increase rate, the temperature decrease rate, and the peak temperature is the conventional measurement sensor 10. It can be seen that it is significantly lower than in the case of.

  According to the embodiment of the present invention described above, since the sensor element 1 at the tip of the measurement sensor 10 can be cooled without using a cooling element or a cooling water pipe, an additional work for providing a cooling water pipe or the like. The measurement sensor 10 which can be put into practical use can be obtained even in a severe environment with an extremely high temperature atmosphere such as the vicinity of the high temperature body 5 such as a red hot slab. In addition, since it is not necessary to use a cooling water pipe or the like, the small measurement sensor 10 can be obtained at low cost, and not only the handling thereof becomes easy, but also problems such as blocking of the cooling water pipe do not occur. Therefore, the possibility of failure of the sensor element 1 can be greatly reduced, and the reliability of the measurement sensor 10 can be improved. Furthermore, even if the injection of the cooling liquid 7 stops, the sensor element 1 can be continuously cooled for a certain period of time, so that it can be used even in an environment where the injection of the cooling liquid 7 may be stopped. A possible measurement sensor 10 is obtained.

  Although one embodiment of the present invention has been specifically described above, the present invention is not limited to the above-described embodiment, and various modifications based on the technical idea of the present invention are possible. For example, the numerical values given in the above-described embodiment are merely examples, and different numerical values may be used as necessary.

  For example, the measurement sensor 10 according to the above-described embodiment is used for measuring magnetism in molten steel in which a solidified shell is formed, or for measuring magnetism in the vicinity of a place where the molten steel is exposed, such as a continuous casting machine. It can be used.

  In the above-described embodiment, the Hall element or the coil is adopted as the sensor element 1 for magnetic measurement of the measurement sensor 10. However, the present invention is not limited to this, and an AMR (Anisotropic Magneto Resistive) is used. ), GMR (Giant Magneto Resistive), and TMR (Tunnel Magneto Resistive) magnetoresistive effect elements, magneto-impedance elements, bistable magnetic elements, flux-gate sensors, magneto-optical elements such as Faraday elements, proton magnetometers, etc. Various magnetic measurement sensor elements such as a magnetic resonance type magnetic sensor, an electrodynamic magnetic sensor, and a superconducting quantum interference element (SQUID) can be employed.

DESCRIPTION OF SYMBOLS 1 Sensor element 2 Wiring 3 Metal sheath 4 Hygroscopic covering material 5 High temperature body 6 Cooling spray nozzle 7 Cooling liquid 10 Sensor for measurement

Claims (5)

In a measurement sensor installed in a steel plate processing apparatus that performs a predetermined process on a heated steel plate,
The sensor element is configured to be able to measure magnetism, and is installed in the vicinity of a cooling means for injecting a cooling liquid for cooling the steel plate ,
A casing that transmits electromagnetic waves and holds the sensor element inside;
At least a region where heat can be transferred from the sensor element, provided in a region covering the sensor element, and a covering material that transmits electromagnetic and has hygroscopicity,
A measurement sensor comprising:   The measurement sensor according to claim 1, wherein the sensor element is a coil or a Hall element.   The measurement sensor according to claim 1, wherein the covering material is made of glass wool or a porous material having voids. In a steel plate processing apparatus that performs a predetermined process on a heated steel plate,
Cooling means configured to be capable of injecting a cooling liquid for cooling the steel sheet;
A measuring sensor installed in the steel sheet processing apparatus ,
The measurement sensor is:
It is configured to be able to measure magnetism, and a sensor element installed in the vicinity of the cooling means,
A casing that transmits electromagnetic waves and holds the sensor element inside;
At least a region where heat can be transferred from the sensor element, provided in a region covering the sensor element, and a covering material that transmits electromagnetic and has hygroscopicity,
Steel sheet processing apparatus according to claim Rukoto equipped with.   The said steel plate processing apparatus is a continuous casting machine or a hot rolling mill, The steel plate processing apparatus of Claim 4 characterized by the above-mentioned.

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