JPH0226043Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a temperature measurement device, and in particular, a temperature measurement device that is suitable for use when measuring the temperature of molten steel, etc. using a consumable thermocouple. The present invention relates to an improvement of a temperature measuring device comprising a temperature measuring section including a temperature sensor, and a temperature converting section that converts the output of the temperature sensor into a temperature signal and displays or outputs it to the outside.

Generally, when measuring the temperature of molten steel using a temperature sensor such as a consumable thermocouple, a temperature measurement unit including a temperature sensor installed at a temperature measurement point such as a converter,
A temperature measuring device is used that includes a temperature converter that converts the output of the temperature sensor into a temperature signal, and a temperature converter that displays or outputs the output of the temperature converter to the outside. . In such a temperature measurement device, in order to prevent erroneous measurements due to defects in the temperature measurement sensor or the temperature conversion section, it is normal to perform verification periodically or as necessary.

However, in the past, appropriate testing equipment had not been developed, so when testing a temperature converter, for example, the temperature sensor consisting of a consumable thermocouple installed at a temperature measuring point such as a converter was removed and replaced. First, connect a constant voltage generator to the temperature converter, apply a reference voltage, and check whether the temperature converter generates a specified output or displays a specified temperature. The verification process was time consuming as it had to be confirmed.

In addition, if the temperature measurement accuracy at the production site gradually decreases mainly due to changes over time in the temperature converter, it is difficult to perform comparative tests using the above method, which may cause problems in operational management. Something was coming.

The present invention has been developed to eliminate the above-mentioned drawbacks of the conventional technology, and it is possible to perform temperature verification of the temperature converter while the temperature measuring unit and temperature converter are connected, and also It is an object of the present invention to provide a temperature measurement device that can clearly detect deterioration in measurement accuracy due to changes, and can also automatically verify a temperature conversion section without requiring manual work by maintenance personnel.

The present invention includes a temperature measurement unit including a temperature measurement sensor disposed at a temperature measurement location, and a temperature converter that converts the output of the temperature measurement sensor into a temperature signal, and displays the output of the temperature converter, or , a temperature measuring device that has a temperature converting section that outputs to the outside, in which a constant voltage for verification is generated in the temperature converting section, including a resistor that is always connected in series with one of the lead-in wires of the output of the temperature measuring section. The vessel and
During normal temperature measurement, the constant voltage generator is not activated, and the output of the temperature sensor is directly input to the temperature converter via the resistor.On the other hand, during verification, the output of the temperature measurement section is input directly to the temperature converter. A changeover switch is provided that shorts the lead-in wires to each other, operates the constant voltage generator, and causes the resistor to function as a temperature measurement sensor for verification, and a storage device that stores the temperature signal output of the temperature converter at the time of verification, The temperature converter can be verified while the temperature measuring part and the temperature converter are connected, and the temperature signals at the time of verification can be compared over time.
The above objective has been achieved.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, this embodiment measures a temperature sensor 12 disposed in a converter, such as a consumable thermocouple, and a sub-lance that holds the temperature sensor 12. A temperature measuring unit 10 consisting of a temperature holder 14, a temperature converter 22 that converts the output of the temperature sensor 12 into a temperature signal, and the temperature converter 2
Temperature measurement of molten steel comprising: a recorder 24 for recording the output of the temperature converter 22 on a chart; In the device, a constant voltage generator 30 consisting of a resistor 36 and a constant voltage generator 35 which are always connected in series to one of the lead-in lines of the output of the temperature sensor 12 is provided in the temperature conversion section 20, and when normally measuring temperature, a constant voltage generator 30 is provided. By turning off the normally open switching contacts 32a and 32b of the switching switch 32, the constant voltage generator 30 is not turned off and the superpower generated by the temperature sensor 12 is directly transferred to the temperature converter 22. On the other hand, at the time of verification, the switching contacts 32a and 32b are turned on to short-circuit the lead-in wires of the temperature sensor 12 output, and the constant voltage generator 30 is activated to apply the verification voltage to both ends of the resistor 36. is generated and transmitted to the temperature converter 22, and the output from the temperature converter 22 is stored in the external computer 34, so that temperature conversion can be performed while the temperature measuring section 10 and the temperature converting section 20 are still connected. In addition to being able to perform the verification of the section 20, the external computer 34 can also compare the temperature signals during the verification over time.

In the figure, 14a and 20a are respectively
The connectors 16 disposed on the temperature measurement holder 14 and the temperature conversion section 20 are connected to the connectors 14a and 20a.
This is the lead wire that connects the two.

The reference voltage generated by the constant voltage generator 30 is set in advance based on an electromotive force-temperature characteristic table, etc., depending on the test temperature. For example, the temperature sensor 12 is a platinum-platinum rhodium thermocouple. In case, the temperature indication value at the time of verification is 1600℃,
It is adjusted to 18.842mV.

The action will be explained below.

First, during normal temperature measurement, the switching contacts 32a, 32
b is turned off, and the constant voltage generator 30 is in a disconnected state. Therefore, as in the past, the temperature sensor 12 made of, for example, a consumable thermocouple is immersed in molten steel, and the electromotive force generated by the temperature sensor 12 is amplified by the temperature converter 22 of the temperature converter 20 to convert the temperature. Normal temperature measurement is performed by converting the signal into a signal, outputting it to the recorder 24 and/or display 26, and recording and/or displaying the signal.

On the other hand, when testing the temperature converter 20,
By turning on the switching contact 32b, the constant voltage generator 30 generates a reference voltage corresponding to the test temperature, and the switching contact 32a is also turned on, so that the temperature sensor 12 side is short-circuited and the input to the temperature converter 20 is turned on. A conductive state is established, and the reference voltage generated by the constant voltage generator 30 is input to the temperature converter 22. Therefore, at the time of this test, the recorder 24 or
And if the verification temperature (for example, 1600°C) ± the temperature within the tolerance is indicated on the display 26, the temperature converter 20
can be determined to be normal. On the other hand, if a temperature different from the verification temperature is specified, the temperature converter 22
After that, it is determined that there is an abnormality.

The above judgment may be made by a worker visually checking the indicated value on the recorder 24 or the display 26, or may be made automatically in the external computer 34 and the judgment result displayed on a lamp. , workers may be notified using an alarm or the like.

Furthermore, since the temperature indication value at the time of verification is stored in the external computer 34, by examining its time-series changes, it is possible to know especially the secular change of the temperature converter 22, which can be useful for equipment diagnosis. .

In the above embodiment, the changeover switch 32
However, if a consumable thermocouple is used as the temperature sensor 12, the changeover switch is automatically turned on or off by the attachment signal of the temperature sensor 12 to the temperature measurement holder 14. 32 may be turned on and turned off after a predetermined period of time, for example, 5 seconds, so that the verification is automatically performed when the temperature sensor is attached. After the verification is completed, if there are no abnormalities, an instruction to enable temperature measurement is output and temperature measurement of molten steel, etc. can be started immediately. In such a case, verification is always performed automatically before starting measurement, and temperature measurement failures can be prevented and high measurement accuracy can be easily maintained.

In the above embodiment, the present invention is applied to a molten steel temperature measuring device using a consumable thermocouple.
The scope of application of the present invention is not limited to this, and can be similarly applied to general temperature measurement devices using other temperature measurement sensors. Moreover, it is similarly applicable to general measuring devices other than temperature measuring devices.

As described above, according to the present invention, the temperature of the temperature converting section can be verified while the temperature measuring section and the temperature converting section remain connected, and the temperature measuring device can be verified. In addition, by storing the output at the time of verification, it is possible to monitor changes over time, especially in the temperature converter, and it is possible to clearly see the state of deterioration in measurement accuracy due to changes over time, making it easier to manage operations. It becomes easier. Furthermore, it has excellent effects such as being able to automatically verify the temperature converter without requiring manual work by maintenance personnel.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a temperature measuring device according to the present invention. 10...Temperature measurement section, 12...Temperature measurement sensor, 20...
... Temperature converter, 22 ... Temperature converter, 24 ... Recorder, 26 ... Display, 30 ... Constant voltage generator,
32... Changeover switch, 32a, 32b... Normally open type changeover contact, 34... External computer, 35... Constant current generator, 36... Resistor.

Claims (1)

[Scope of Claim for Utility Model Registration] A temperature measurement unit including a temperature measurement sensor disposed at a temperature measurement point, and a temperature converter that converts the output of the temperature measurement sensor into a temperature signal, the output of the temperature converter Show,
Alternatively, in a temperature measuring device comprising a temperature converter that outputs to the outside, a constant voltage for verification including a resistor that is always connected in series with one of the lead-in wires of the output of the temperature measuring section in the temperature converting section. During normal temperature measurement, the constant voltage generator is not activated.
The output of the temperature sensor is directly input to the temperature converter via the resistor, while during verification, the lead wires of the temperature measurement section output are short-circuited to each other, and the constant voltage generator is activated; A changeover switch that allows the resistor to function as a temperature measurement sensor for verification, and a storage device that stores the temperature signal output of the temperature converter at the time of verification are provided, and temperature conversion is performed while the temperature measurement section and temperature conversion section are connected. 1. A temperature measurement device that is capable of performing temperature verification and comparison over time of temperature signals at the time of verification.