JPS5947834B2 - Furnace condition measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measuring device for monitoring conditions inside a heating furnace or the like.

The manufacturing process of steel products often includes a process of heating and storing base materials and intermediate products in a furnace.

It is necessary to monitor the condition inside the furnace (furnace condition) from the aspects of quality control and energy management of such processes, and for this purpose, measurements of the furnace atmosphere temperature, workpiece temperature, gas analysis, etc. are mainly performed. Therefore, it is necessary to monitor the furnace condition at multiple parts within the furnace and over time. To measure the workpiece temperature, a thermocouple is buried in the sample workpiece, and the terminal of the thermocouple is pulled out of the furnace to read the thermoelectromotive force.However, in a furnace equipped with a walking beam, the workpiece does not move. It is necessary to prepare long thermocouples in order to move the thermocouples, which not only increases costs, but also causes problems in that they are often damaged during transportation. Also, for gas analysis, it is necessary to run long sampling piping to the gas sampling part.
There were problems such as the work required for this purpose was a long time and a large amount of money was required. Since this type of reactor condition monitoring is not carried out on a regular basis, and most of the equipment used is disposed of only once, the cost burden is extremely high. The present invention has been made in view of the above circumstances, and is a novel method that allows easy monitoring of workpieces moving in the furnace, allows repeated use, and is highly convenient for analyzing measurement data. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to drawings showing embodiments thereof, with the aim of providing a furnace condition measuring device.

FIG. 1 is a vertical sectional view schematically showing a furnace condition measuring device according to the present invention.

Reference numeral 1 is a heat insulating case, which has an external dimension of 30 to 50 (V7l cubic) and can be opened and closed freely.The outermost layer is made of iron plate (or ceramic plate) 11 of a suitable thickness.
A first heat insulating layer 12a) a first liquid containing layer 13a) a second heat insulating layer 12b) a second liquid containing layer 13b and a third The heat insulating material layer 12c is formed to have an appropriate thickness using ceramic plates, thin iron plates, etc. as partition walls.

As the material for the heat insulating layers 12a, 12b, 12c, asbestos, glass fiber, ceramic fiber, carbonized cork, etc. are adopted. In addition, liquid capacity 13a, 13b
Water is generally used as the liquid contained within.
A tank 2 with an appropriate volume is provided in the inner part of the insulation case 1, and this tank 2 communicates with the liquid storage layers 13a and 13b. It is installed protruding from the earthen wall.

Pressure release holes 14a and 14b communicating from the liquid storage layers 13a and 13b to the outside of the heat insulating case 1 are formed in the earthen wall of the heat insulating case 1 by a cylindrical body that penetrates the heat insulating material layer and the outer covering iron plate. Under the tank 2 inside the heat insulating case 1, there is further provided a casing 3 which can be opened and closed and has a laminated structure of a steel plate and a heat insulating material, and an electronic device to be described later is housed within the casing 3. Now, the apparatus of the present invention is used by being placed in a furnace at about 1000° C., but the inside of the casing 3 needs to be maintained at a temperature below the allowable upper limit of the electronic device. In the device of the present invention, the heat transfer blocking effect by the heat insulating material layers 12a, 12b, 12c1 of the heat insulating case 1, the heat insulating material of the housing 3, etc., and the liquid storage layer 13
This is achieved by the cooling effect due to the latent heat of vaporization of water in a and 13b. Liquid storage layer 13a, 13b
Since the water inside the housing 3 basically rises only up to 100°C, the inside of the casing 3 is maintained at 70°C or lower, which is the generally allowable upper limit temperature for electronic devices. The design of the heat insulating structure is determined mainly by the temperature inside the casing 3 and the time the apparatus of the present invention is inserted into the furnace. When using a heavy-duty electronic device with regard to operating temperature, the design standards become more relaxed.On the other hand, if you want to use it at 35 to 45 degrees Celsius due to the specifications of the electronic device or from the perspective of emphasizing operational reliability, it is necessary to set the dewar pin inside the device. Strict design standards are required to accommodate electronic devices, etc. Further, the maximum charging time is determined mainly by the volume of the tank 2. In other words, the water in the liquid capacity 13a, 13'b evaporates from the pressure release holes 14a, 14b due to heating from all four sides, but the water in the tank 2 compensates for the evaporation, so that no water remains in the tank 2. This is because evaporation continues as long as it exists and a certain thermal equilibrium is maintained. Note that the structure for protecting the electronic device, such as a heat insulating case or housing, is not limited to the above structure as long as it can maintain the electronic device at a required temperature. Now, 4a is a thermocouple as a temperature sensor, the joint part is drawn out outside the heat insulating case 1, and both pole terminals are housed inside the case 3.
It is connected to a signal converter 5a that amplifies the thermoelectromotive force of MV order to V order.

One or more thermocouples 4a and signal converters 5a are provided depending on the purpose of use. 4b is a gas sensor,
The sensor is attached to the peripheral wall of the heat insulating case 1 so as to face the outside thereof.

The gas sensor 4b detects gas (0
2, C0, C02, etc.), and its electrical characteristics change depending on the gas concentration (gas component amount). A corresponding V-order voltage signal is obtained from this signal converter 5b. One or more gas sensors 4b and signal converters 5b are provided depending on the type of gas to be detected. Note that the thermocouple 4a is drawn out of the case through a thin tube that penetrates the peripheral wall of the heat insulating case 1. Further, this thin tube in the heat insulating case 1 and the peripheral wall penetrating portion of the gas sensor 4b do not form a liquid storage layer to prevent water leakage. The outputs of the signal converters 5a and 5b are both analog signals, but these are converted into digital signals by analog/digital converters (hereinafter referred to as A/D converters) 6a and 6b, and then sent via a multiplexer 7 to non-volatile and digital signals. The data is written in a memory device 8 made of a rewritable semiconductor memory chip.

Reference numeral 9 denotes a memory controller, and the multiplexer 7 receives a switching signal for alternately selecting the output of each of the A/D converters 6a and 6b, and in synchronization with this switching signal is sent one after another to the memory device 8. It generates an address signal for writing digital signals to predetermined addresses in a fixed order.

The A/D converters 6a, 6b1 multiplexer and the memory controller 9 are substantially composed of a one-chip microprocessor, and the memory device 8 and the battery 10 for driving them are housed in a housing like the signal converters 5a, 5b. It is stored inside the body 3. The memory device 8 is detachably attached and can be taken out from the housing 3 and the heat insulating case 1, which can be opened and closed. The device of the present invention, which is constructed as described above, supplies water to the tank 2, turns on the switch for supplying power from the battery 10, closes the casing 3 and the heat insulating case 1, and also connects the thermocouple 4a. The soil is fixed to the temperature measurement point of the workpiece and is charged into the furnace together with the workpiece.

If the joint part of the thermocouple 4a is embedded in the workpiece in advance, a pair of compensating conductors, one end of which is connected to the signal converter 5a and the other end of which is drawn out of the insulation case 1, are connected to the thermocouple. Connecting. When the device of the present invention is inserted into the furnace in this way, the thermocouple 4a and the gas sensor 4b output analog data regarding the workpiece temperature and the component amount of the gas to be detected in the furnace, so these data are converted into signals. converter 5
The signals enter the A/D converters 6a and 6b via the signals a and 5b, are alternately selected by the multiplexer T, and are sequentially written into the memory device 8.

In other words, the memory device 8 stores time-varying and discrete data on the workpiece temperature and the amount of gas components that change from moment to moment. During this time, the inside of the casing 3 is kept at a temperature below a certain level by the heat insulating structure as described above, and the measurement operations described above are performed stably.Also, since the surface generating device itself is charged into the furnace together with the workpiece, there is no walking. Even in a furnace equipped with beams, the beams move in conjunction with the workpiece. After completing the required heat treatment, the apparatus of the present invention is taken out of the furnace together with the workpiece.

After the inventive device is cooled down, the heat insulating case 1 and the housing 3 are opened, the power supply is cut off by operating the switch, and the memory device 8 is taken out of the heat insulating case 1. FIG. 2 is a schematic block diagram of a data reading device for reading data written in the memory device 8. As shown in FIG.

The memory device 8 is inserted into an appropriate connector, emits address signals in the same order as the memory controller 9, and sequentially reads the data written to each address, and also stores the workpiece temperature data in the register 21a and gas component data. The memory controller 20 is connected to the demultiplexer 22 and a memory controller 20 that controls the demultiplexer 22 so as to distribute and send out the quantity data to the registers 21b.

The registers 21a and 21b receive data input in a first-in/first-out manner directly in the form of a digital signal or as a digital/analog converter 23.
a and 23b in the form of analog signals, and these output signals are recorded in a desired form on a recorder (not shown) via an appropriate interface. This allows the measurer to grasp changes in furnace conditions over time by continuing to record data. It is possible for the memory device 8 to store the recorded data as it is, or it is also possible to erase the recorded data by irradiating it with ultraviolet rays, etc., and then insert it into the housing 3 again for use in the next measurement.

It goes without saying that the device of the present invention itself can be used repeatedly by refilling with water. As detailed above, when using the device of the present invention, there is no need to prepare a long thermocouple or compensating conductor when measuring the temperature of a workpiece moving in the furnace, and there is no risk of thermocouple damage, and gas sampling Furnace conditions can be easily measured without the need for additional equipment.

Moreover, since the device can be used repeatedly, the cost required for measurement is significantly reduced. Further, the present invention has excellent effects such as the convenience of data analysis since it is not necessary to read measurement data or process the data at the time of measurement, and batch processing can be performed at a desired time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical sectional view schematically showing the structure of the device of the present invention, and FIG. 2 is a schematic block diagram of the data reading device.

Claims (1)

[Claims] 1. A heat insulating case and a sensor attached to the heat insulating case so as to fit outside the heat insulating case, both of which are housed within the heat insulating case, and converting an analog signal obtained by the sensor into a digital signal. A furnace condition measuring device comprising: an analog/digital converter for conversion; and a memory device for storing the output of the analog/digital converter. 2. The furnace condition measuring device according to claim 1, wherein the heat insulating case has a laminated structure of a heat insulating material layer and a liquid storage layer, and the liquid containment layer is provided with a pressure release hole opening outside the heat insulating case.