JPS614933A - Temp. detecting instrument - Google Patents

Abstract

PURPOSE:To avoid the effect of high frequency for heat treatment by positioning oppositely a light source and the tip face of a light conducting route body at the prescribed place of the display part of a liquid thermometer. CONSTITUTION:A display part 4 of a thermometer 3 and a holding tool 19 of a light source 5, etc. are fixed in parallel at the prescribed intervals to a fitting plate 18, and the holding tool 19 is made by penetrating a shaft 22 with a knob 23 between bearings 21, 21 of the upper part of the both ends of the plate 18, in a liquid thermometer 3 measuring the temp. of an object for heat treatment with high frequency by high frequency generating device. The light source 5 and the tip part 6 including the tip face 6 of an optical fiber 8 are fitted to nearly the same place as the shaft 22 and it is constituted so as to convert into electrical signal by sensing with a detecting device 9 the light emitted from the base end face 7 of the fiber 8. The temp. sensing part 17 of the thermometer 3 is then brought into contact with the object, the shaft 22 is slided by the knob 23 and the opposite positioning is performed to the prescribed position.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a temperature detection device that uses high frequency waves to detect the temperature of a workpiece to be heat-treated.

For example, high frequencies are often used when heat-treating non-metallic honeycombs or other objects with poor thermal conductivity.

"Conventional technology" Conventional thermocouples are used to detect the temperature of such objects.

A method that uses a normal temperature sensor such as a resistance thermometer.

Other methods include using an infrared thermometer.

"Problems to be Solved by the Invention" However, the conventional method using the temperature sensor described above is affected by high frequencies, making it difficult to continuously and accurately detect the temperature of the object. Furthermore, the method using an infrared thermometer is very expensive and has insufficient accuracy.

In these conventional techniques, in order to detect the temperature of the object without being affected by the high frequency waves used for heat treatment, it is necessary to temporarily stop the generation of high frequency waves, that is, heating, and then detect the object, which saves time and effort. In addition, the heat treatment time of the target object becomes longer, and the temperature of the target object decreases due to heat dissipation during the process, making accurate temperature detection difficult from this point of view as well.

"Means for Solving the Problems" In view of the above-mentioned circumstances, the present invention has been made to solve the above-mentioned problems of the prior art. The present invention aims to propose a temperature detection device that is not affected by high frequency waves for heat treatment by using a detection device or the like.

This temperature detection device first uses a liquid thermometer 3 to measure the temperature of an object 2 to be heated by high frequency waves generated by a high frequency generator 1 .

At a predetermined location of the display section 4 of the liquid thermometer 3, a light source 5 is located opposite to it, and a distal end surface 6 of a light conductive path body such as an optical fiber 8 is arranged to guide light from the distal end surface 6 to the proximal end surface 7. They are located opposite each other.

The apparatus includes a detection device 9 having a detection section that senses light emitted from the base end surface 7 of the optical fiber 8 or the like and converts it into an electrical signal.

"Example" First, with reference to FIG. 4, an example of an object 2 to be heat-treated by high frequency will be described.

The object 2 such as a non-metallic honeycomb is preferably
A pad 10.10 made of the same material as , a metal plate 11.11, and an electrical insulating material 12.12 are interposed in this order between a fixed base 13 and a compression base 14 that can be moved up and down.

A ten-pole plate 15 and a monopolar plate 16 of the high-frequency generator 1 are connected to the metal plates 11.11, respectively. The temperature sensing portion 17 of the liquid thermometer 3 is brought into contact with the object 2 .

As the liquid thermometer 3, an alcohol temperature needle or the like is used, in which a liquid such as alcohol that is not affected by high frequencies is sealed in a glass material.

Next, a first embodiment shown in FIG. 1 will be described.

The display part 4 of the liquid thermometer 3 and the holder 19 are arranged and fixed in parallel to the rectangular mounting plate 18 at a predetermined interval.

The holder 19 includes an elongated plate 20 fixed to the mounting plate 18;
Bearings 21, 21 fixed on both ends of this elongated plate 20
, the shaft 22 inserted between the bearings 21, 21, and the shaft 2
It consists of a knob 23 attached to one end of 2.

The shaft 22 of this holder 19 has a light source 5 and an optical fiber 8.
The distal end portion including the distal end surface 6 of is attached at approximately the same location. This installation requires that the optical fiber 8 be attached to the shaft 22.
Alternatively, the light source 5 may be attached to the distal end of the light source. By sliding the shaft 22 using the knob 23, the light source 5 and the tip surface 6 of the optical fiber 8 are positioned opposite to a predetermined location on the display section 40 of the liquid thermometer 3, that is, a specific temperature display location.

An optical fiber 8 is a typical example of the optical conduction path body, which is a round bar-shaped transparent material that guides light from the distal end surface 6 to the proximal end surface 7.

The detection device 9 includes a detection section that senses light emitted from the base end surface 7 of the optical fiber 8 and converts it into an electrical signal, and may be of a so-called photoelectric switch type.

24 is a display device such as a lamp, which is activated by the output signal from the detection device 9 and functions to display that the object 2 has reached a predetermined temperature.

Next, a second embodiment shown in FIG. 2 will be described.

In this second embodiment, two predetermined locations on the display section 4 of the liquid thermometer 3, that is, locations where the upper limit temperature and lower limit temperature of the heat treatment of the object 2 are displayed, are located opposite to each other. A light source 5I, an optical fiber 81, a light source 52, and an optical fiber 82 are provided.

A control unit 25 turns on and off the operation of the high frequency generator 1 based on output signals from the detection devices 91 and 92 corresponding to both optical fibers 81 and 82, respectively.
is provided.

The configuration, functions, etc. of other members are the same as those of the first embodiment, so their explanations will be omitted.

Next, a third embodiment shown in FIG. 3 will be described.

In this third embodiment, a pair of light sources 5 and the tip of an optical fiber 8 are provided at a predetermined number of locations on the display section 4 of the liquid thermometer 3, that is, at each display location for each possible temperature of the object 2. Face 6
are arranged facing each other.

The detection device 9' detects the proximal end surface 7 of each optical fiber 8.
It consists of a uni-node consisting of a number of detection parts that sense each light emitted from the sensor and convert it into an electrical signal.

The display device 24' is composed of a unit in which the same number of lamps, etc. as the optical fibers 8, etc. are arranged, and each lamp, etc. is connected to the detection section W.
It is activated by the output signal from the corresponding detection section of 9''.

The configuration, functions, etc. of other members are the same as those of the first embodiment, so their explanations will be omitted.

"Function" The temperature sensing device according to the present invention configured as described above functions as follows.

Zunawaji, when the object 2 is subjected to high-frequency heating treatment by the high-frequency generator 1, the temperature sensing part 17 of the liquid thermometer 3 is in contact with the heated object 2, so the temperature of the object 2 is increased. appears as a moving and changing liquid level on the display section 4 of the liquid thermometer 3.

Then, the light projected from the light source 5 is reflected by the liquid temperature 8 (if the liquid surface of the display section 4 of 3 is moving and displaced), and enters the tip surface 6 of the optical fiber 8. Note that when the liquid level moves below the position facing the light source 5 and the tip surface 6, the light projected from the light source 5 is reflected to enter the tip surface 6 of the optical fiber 8. It will not be done.

The light incident from the tip surface 6 of the optical fiber 8 is
It is guided to the proximal end surface 7, extracted from the proximal end surface 7, sensed by the detection section of the detection device 9, and converted into an electrical signal.

The length of the optical fiber 8 is determined so that the detection device 9 is located at a location where it is not affected by the high frequency of the high frequency generator 1.

Various operations are performed based on the output signal from the detection device 9.

In this way, the temperature of the object 2 is measured by the liquid thermometer 3, which is not affected by high frequencies, and the result is transmitted by the optical fiber 8 to the detection device 9, which is located a necessary distance, so that it is not affected by high frequencies. That's not it.

In the first embodiment, based on the output signal from the detection device 9, the display device 24 indicates that the object 2 has reached a predetermined temperature.

In the second embodiment, a detection device 9. ．． 92
The control unit 25 controls the operation of the high-frequency generator 1 to turn on at the lower limit and turn off at the upper limit based on the output signal from the control unit 25, so that the temperature of the object 2 can be maintained at a constant value between the upper and lower limits. Control takes place.

Further, in the third embodiment, the lamps and the like of the display device 24' blink in response to the output signals from the detection device 9' corresponding to each of the light sources 5 and the optical nores 4 and 8 which are arranged in multiple stages. Since the temperature changes, the temperature change of the object 2 is continuously displayed.

"Effects of the Invention" As explained above, the temperature detection device according to the present invention is susceptible to the effects of high frequency waves for heat treatment by combining a liquid thermometer, a light conductive path body such as an optical fiber, and a detection device. This makes it possible to continuously and accurately detect the temperature of the object being heat-treated, and the configuration is relatively simple and cost-effective.There is no need to interrupt the heat treatment, so it is less time-consuming. In addition, processing time for objects is shortened, and more accurate temperature detection is now possible, paving the way for automatic temperature control and continuous temperature display, eliminating the problems that existed with this type of conventional technology. The effects it produces are remarkable and great.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of the invention, FIG. 2 is a perspective view showing a second embodiment of the invention, and FIG. 3 is a perspective view showing a third embodiment of the invention.
It is a perspective view showing an example. FIG. 4 is a front cross-sectional view showing the high-frequency heating device for the object. Brief explanation of symbols 1...High frequency generator, 2...Object, 3...Liquid thermometer, 4...Display part, 5.51.52...Light source, 6...Tip surface, 7... proximal surface, 8. 'L,
82...Optical fiber, 9.9+, 92.9'
...detection device, 10...pad, 11...metal plate, 12...electrical insulating material, 13...fixing base, 14...
・Compression table, 15...Deca pole plate, 16...-electrode plate, 17
...Temperature sensing part, 18...Mounting plate, 19...Holder,
2o...Elongated plate, 21...Bearing, 22...Shaft, 2
3...Knob, 24, 24°...Display device, 25
···Controller unit.

Claims (1)

[Claims] A liquid thermometer that measures the temperature of an object to be heat-treated by high frequency; a light source located opposite a predetermined location on a display section of the liquid thermometer; and a tip surface located at a predetermined location on the display section a light conductive path body that guides light from the distal end surface to the proximal end surface, and a detection device that has a detection unit that senses the light guided from the base end surface of the light conductive path body and converts it into an electrical signal; A temperature sensing device comprising: