JPS5947835B2 - 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 heat treating 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. Moreover, 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, so the burden in terms of soil and cost is extremely large. The present invention has been made in view of the above circumstances, and aims to provide a furnace condition measuring device that can easily monitor workpieces moving in the furnace and can be used repeatedly. The invention will be described in detail based on drawings showing embodiments thereof.

FIG. 1 is a vertical sectional view schematically showing the main body of the 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 cm cubic, is configured to be openable and closable, and has a peripheral wall with a thickness of about 10 cnL, and an iron plate (or ceramic plate) 11 of a suitable thickness is arranged as the outermost layer. A first heat insulating material layer 12a) a first liquid containing layer 13a) a second heat insulating material layer 12b) a second liquid containing layer 13b and a third heat insulating material are arranged inside the outer covering in order from the outside. layer 1
2c is formed with a suitable thickness using a ceramic plate, a thin iron plate, etc. as a partition wall.

As the material for the heat insulating layers 12a, 12b, 12c, asbestos, glass fiber, ceramic fiber, carbonized cork, etc. are adopted. In addition, liquid storage P13a, 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.A water supply cylinder 2a with a lid that can be opened and closed is attached to the upper wall of the insulation case 1. It is installed protrudingly.

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 upper wall of the heat insulating case 1 by a cylindrical body that penetrates the heat insulating material layer and the iron jacket 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 measuring device main body A is used by being placed in a furnace at about 1000° C., but the inside of the casing 3 needs to be maintained below the allowable upper limit temperature of the electronic device.

In the product of the present invention, the heat insulating material layers 12a, 1 of the heat insulating case 1
2b, 12c1 This is achieved by a heat transfer blocking effect due to the heat insulating material of the housing 3, and a cooling effect due to the latent heat of vaporization of water in the liquid containing layers 13a, 13b. Since the water in the liquid containing layers 13a and 13b basically only rises to 100°C, the inside of the casing 3 is maintained at 70°C or lower, which is the generally allowable upper temperature limit for electronic devices. The design of the heat insulating structure is mainly determined by the temperature inside the housing 3 and the charging time of the measuring device main body A. 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. That is, the liquid storage layer 13a,
The liquid in 13b is heated from the four peripheries to release pressure holes 14a,
Although the liquid evaporates from 14b, the liquid in the tank 2 compensates for the evaporated amount, so as long as there is liquid in the tank 2, evaporation continues and a certain thermal equilibrium is maintained. Note that the structure for protecting the electronic device, such as the heat insulating case and the 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 of which is drawn out outside the heat insulating case 1, and both pole terminals are housed in the case 3, which amplifies the m-order thermoelectromotive force to the required level. It is connected to a signal converter 5a.

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 voltage signal of a corresponding required level 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. 6 is an FM signal device consisting of an FM modulation circuit 61, a transmission circuit 62, an antenna 63, and the like.

The output signals of the signal converters 5a and 5b are multiplex-modulated in an FM modulation circuit 61, and the FM modulated wave in which the two data are superimposed is transmitted to space from an antenna 63 as an FM radio wave by a transmission circuit 62. be. Although the antenna 63 is mounted so as to face the outside of the heat insulating case 1, the FM modulation circuit 61 and the transmitting circuit 62 are housed within the housing 3. Reference numeral 7 denotes a temperature monitor inside the housing 3, which is composed of a temperature sensor and an alarm signal generation circuit, and is configured to monitor when the inside of the housing 3 reaches a temperature set in the alarm signal generation circuit (for example, the above-mentioned allowable upper limit temperature). A predetermined signal is emitted to the FM modulation circuit 61, and an alarm signal is emitted from the FM transmitter 6 as an FM wave.

Reference numeral 8 denotes a battery, which supplies power to each of the above-mentioned electronic devices via a switch.

For example, as shown in FIG.
An FM receiver B that transmits and demodulates the radio waves transmitted from the FM transmitter 6 is installed at a suitable location outside the furnace, and receives the temperature data measured by the thermocouple 4a and the gas sensor. The demodulated signals of the gas component amount data measured by 4b are respectively outputted and are recorded or recorded on a data recorder or a pen-writing oscilloscope (not shown).

When the alarm signal is received, an alarm device built into the FM receiver B is activated. In addition, in the example described above, the configuration was configured to transmit and receive FM radio waves, but AM
Of course, it may be configured to transmit and receive radio waves, and if there are a large number of thermocouples and gas sensors, a separate transmitter/receiver may be provided for each. As described above, the device of the present invention, which is composed of the measuring device main body A and the FM receiver B, supplies water to the tank 2 and the battery 8.
In order to supply power from the workpiece W, the switch is turned on to close the housing 3 and the heat insulating case 1, and the thermocouple 4a is fixed to the temperature measurement point of the workpiece W using soil. It is used by placing the FM receiver B in a suitable place outside the furnace. If the thermocouple junction is embedded in the workpiece W 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 insulating case 1, are connected to the thermocouple. Connecting. When the measuring device main body A is inserted into the furnace, the thermocouple 4a and the gas sensor 4b
The signal converters 5a and 5 output data regarding the workpiece temperature and the amount of components of the gas to be detected in the heating furnace F, respectively.
These data that have passed through b are transmitted as FM radio waves by the FM transmitter 6. Therefore, FM receiver B
receives this FM radio wave, and desired data is successively obtained as its output signal. During this time, the measuring device body A
Since the thermocouple 4b moves in conjunction with the workpiece W, there is no risk of the thermocouple 4b being damaged. In addition, since a temperature monitor T is installed, if the temperature inside the housing 3 exceeds the set temperature due to evaporation of the water in the tank 2, etc., the alarm on the FM receiver B will be activated, so measurement can be performed immediately. If the main body A of the measuring device is taken out of the furnace, thermal damage to the main body A of the measuring device can be avoided. After a predetermined time for entering the furnace has elapsed, the measuring device main body A is recovered together with the workpiece W out of the heating furnace F, but it goes without saying that repeated use is possible by resupplying water into the tank 2. As described in detail 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, and the present invention has excellent effects.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, in which FIG. 1 is a vertical sectional view schematically showing the structure of the measuring device body, and FIG. 2 is a diagram schematically showing how the device of the present invention is used. 1... Insulation case, 2... Tank,
3... Housing, 4a... Thermocouple, 4b.
... Gas sensor, 5a, 5b ... Signal converter, 6 ... FM transmitter, 7 ... Temperature monitor, A ... Measurement Device body, B...
FM receiver.

Claims (1)

[Claims] 1. A heat insulating case, a sensor attached to the heat insulating case so as to face the outside of the heat insulating case, and a sensor disposed within the heat insulating case,
A furnace condition measuring device consisting of a measuring device body equipped with a transmitter that modulates the signal obtained from the sensor and transmits it to the outside of the heat insulating case, and a receiver that receives and demodulates the radio waves transmitted by the transmitter. . 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.