JPS5983019A - Temperature measuring device for body in heating furnace - Google Patents

Abstract

PURPOSE:To measure correct temperature very accurately, by measuring the temperature of a heated body or atmosphere by a measuring pipe, which has a protruded opening part in a heating furnace, and computing the temperature by an operating device. CONSTITUTION:In a heating furnace 1, the following devices are provided: a body to be heated 2; a measuring pipe 3, which has an opening protruded to the inside from the furnace wall of the heating furnace; a protecting pipe 4, which is protruded into the inside of the heating furnace together with the measuring pipe 3; a detector 5, which utilizes an image sensor such as a CCD that receives radiation energy from the body 2 through the measuring pipe 3 or radiation energy from the bottom part of the protecting pipe 4; and an operating device 6 such as a microcomputer, which computes the correct temperature of the body 2 based on the output of the detector 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of the Invention The present invention relates to an apparatus for measuring the temperature of an object being heated in a heating furnace.

(2) Prior Art A radiation thermometer is used to measure the temperature of a moving object being heated in a heating furnace. This platform.

Energy radiated from the reactor walls reflected off objects and entered the radiation thermometer, causing measurement errors.

In order to eliminate this error, a measuring tube was inserted to reduce the radiant energy from the furnace wall.

All F wall temperatures were measured and corrected.

However, in any of the 7 methods, the mounting part is complicated and expensive.

(3) The objective of the invention is to provide a complete temperature measuring device for objects inside a heating furnace that is easier to measure by using a detector using an image sensor. It is.

(4) Embodiment of the Invention FIG. 1 is a diagram showing an embodiment of the invention.

In the figure, 1 is a heating furnace, 2 is an object located in the heating furnace 1 and heated, 3 is a measuring tube having an opening protruding from the wall of the heating furnace 1 into the inside, and 4 is heated together with the measuring tube 3. A protective tube protruding into the furnace 1; 5 a detector using an image sensor such as a COD that receives radiant energy from the object 2 or from the bottom of the protective tube 4 through the entire measuring tube 3; 6 is an arithmetic device such as a microcomputer that calculates the correct temperature of the object 2 from the output of the detector 5. Note that the detector 5 and the arithmetic device 6 may be configured integrally.

The internal temperature of the heating furnace 10 is made to be a uniform temperature p due to the effect of cavity radiation.If the temperature of the heating furnace 1 is Tw, the emissivity is Ew, the temperature of the object 2 is Tm, and the emissivity Em is the following equation. Stand up.

R(Ts)2EmR(Tm)+7(1-Em) Evt
m<Tw) - - - - (1) Here, R (Ts) is the radiant energy that passes through the entire measurement tube 3 and enters the detector 5, R
(Tm) and R(Tw) are object 2. With radiant energy equivalent to the blackbody of heating furnace 1.

The first term on the right side, EmR(Tm), is the radiant energy from the object 2, and the second term, 1(1-Em) EwR(Tw), is the reflectance of the radiant energy EwR(Tw) from the heating furnace 1 at the object 2. In the case of radiation reflected by (1-Em), this is the mixing rate.

Solving equation (1) for R(Tm) yields the following equation.

Tsuma, j), Em, Ew, etc. are already known.5. R('L”s
) is the radiant energy from the measuring tube 3, and R('TV) is the radiation energy from the bottom of the protective tube 4, which matches the ambient temperature in the furnace.
The correct temperature Tm of Salary 2 can be found.

FIG. 3 shows another embodiment, in which only the measuring tube 3 protruding into the heating furnace 1 is prepared, and a detector using an image scan system detects the radiant energy from the object 2 and the inner wall of the open pipe 3. 5, it is possible to measure the correct temperature Tm of the object 2 by repeatedly scanning and measuring it as shown in Figure 4, and calculating the calculation t(T) as shown in equation (2).

Note that if the material of the measuring tube 3 is made the same as the entire object l, the emissivity will be equal and calculation will be easy.

Alternatively, a thermocouple may be embedded in the measuring tube 3 to measure the ambient temperature Tw.

(5) Summary of the Invention As stated above, the invention of A measures the temperature of a heated object or atmosphere using a measuring tube having an opening protruding into a heating furnace, and measures the correct temperature of the object using a calculation device. This is a side heating device for objects in a heating furnace.

(6) Effects of the invention The atmospheric temperature inside the furnace, which is kept at a uniform temperature by cavity radiation, is measured and correction calculations are performed.

The correct temperature (actual temperature) of the object can be determined very accurately. FIGS. 1 and 3 are configuration explanatory diagrams showing one embodiment of the present invention, and FIGS. 2 and 4 are signal diagrams for explaining the operation.

1... Heating furnace, 2... Object, 3... Measuring tube, 4...
...Pupillary tube, 5...Detector, 6...Arithmetic device Patent applicant Chino Seisakusho Co., Ltd.

Claims (1)

[Claims] 1. A device for measuring the temperature of an object being heated in a heating furnace, including a measuring tube having an opening protruding into the heating furnace from the furnace wall, and a heating object through the measuring tube. a detector using an image sensor that measures the temperature of the room and the ambient temperature;
A temperature measuring device for an object in a heating furnace, comprising: an arithmetic device that calculates the correct temperature of the heated object from the output signal of the detector. 2. A protective tube having a closed end is protruded into the heating furnace together with the measuring tube, and the bottom of the protective tube is measured by the detector to measure the ambient temperature. The temperature measuring device for an object in a heating furnace according to item 1. 3. The temperature measuring device for an object in a heating furnace as set forth in claim 1, characterized in that a thermocouple is embedded in the measuring tube to measure the ambient temperature.