JPS58133589A - Regulator for temperature of body to be heated of electric furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the temperature and temperature distribution of a heated body in an electric furnace such as a material testing machine. A plurality of heated object temperature detectors are installed on the heated objects to be charged into the furnace, and an in-furnace temperature sensor is placed in the furnace away from the heated objects. The output signal of the detector and the output signal of the temperature setting device are compared and calculated using a denominator, and when the temperature rises, the temperature of the heated body is measured.
The heater is controlled based on the output signal of the furnace, and during heat retention, the heater is controlled based on the output signal of the furnace temperature detector, and the temperature of the heated object is automatically adjusted.

In general, a material testing machine etc. is used to test the strength and other characteristics of a material at a specific temperature. An electric furnace is used.

Conventionally, temperature control systems for such electric furnaces include systems that detect the temperature inside the furnace and control the gravity supply to the heater, and systems that directly detect the temperature of the heated body and control the supply to the heater. There was a system that controlled the power supply. however,
The temperature inside the furnace and the temperature of the heated body do not necessarily match, which was a longing. Since the temperature distribution in each part of the heated body is not necessarily constant, it is not possible to accurately determine the temperature of the heated body using a method of detecting and controlling the temperature inside the furnace.

On the other hand, methods that directly detect and control the temperature of the heated object can accurately adjust the temperature of the heated object under normal conditions, but may cause the heated object to be significantly deformed.

If it is destroyed, the temperature detector will be separated from the 1!1 heating element, and the actual temperature of the heated element will not be detected and will show a different value. Therefore, in either method, temperature control is incomplete, causing errors in the results of material tests, which may impair their reliability.

This invention solves the above-mentioned problems in a temperature adjustment device for an electric furnace. SUMMARY OF THE INVENTION An object of the present invention is to provide a heated body temperature adjusting device for an electric furnace that can accurately adjust the temperature and temperature distribution of a heated body; It is an object of the present invention to provide a heated body temperature adjustment device for an electric furnace that is capable of adjusting the temperature of a heated body even if the temperature of the heated body is different from the actual temperature when the body is away from the heated body. An object of the present invention is to provide a highly reliable material testing machine capable of performing tests while maintaining a constant temperature distribution of a heating body.

That is, the present invention is as illustrated in the embodiments.

Multiple heaters a, 1b, IC! Electric furnace 2I with
7i! : A plurality of heated body temperature detectors 4a, 4b, 4c are attached to the heated body 6 charged into the electric furnace 2 to detect the temperature of the heated body, and An in-furnace temperature detector 5 that is placed separately from the heated object 3 and detects the furnace temperature, a temperature setting device 6 that sets the temperature of the heated object 6, and the heated object temperature detectors 4a and 4b.

4c, Furnace temperature detector 5. i1 degree setting device 6 is connected, and the output signal of each heated body temperature detector 4a, 4b, 4c is compared with the setting signal of temperature setting device 6'', and the temperature setting device 6 is connected to each heater 71a, 1b, 1c and outputs a heater power control signal by calculating the power to be supplied to each heated body temperature detector 4a, 4b, 4c when the deviation reaches a predetermined value or less.
The difference between the heated body temperature and the furnace temperature and the temperature of each heater Ia, 1b, 1c are determined from the output signal of
Calculate the ratio of power to be supplied to the furnace temperature detector 5.
A heat extraction body temperature adjustment device for an electric furnace 2 is provided with a computing unit 7 that computes the power to be supplied to each heater 41a, 1b, 1c based on the output signal of and outputs a heater power control signal. Related.

The present invention will be explained below based on the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. An electric furnace 2 having a plurality of heaters 4ia, 1b, and 1c has a test piece 6, which is to be tested at a high temperature, placed therein as a heated body. A plurality of heated body temperature detectors 4a, 4b, 4c are attached to detect the temperature of each part of the test piece 6. Furnace temperature detectors 5 are installed at these positions.Thermocouples are generally used as these temperature detectors 4a, ab, 4c, and s.J heat transfer body temperature detectors 4a,
4b, 4c and the furnace temperature detector 5 are connected to the computing unit 7 via an analog switch 8 and an analog converter 9. Analog switch 8 is for each temperature detector 4a, 4b, 4c.

Changeover switch 8 a for sequentially switching the output signals of 5
+ 8 b, 8 c, 8 d T configuration, switch selection circuit 11 connected from arithmetic unit 7
Switching is performed by a selection signal from. Also.

A temperature setting device 6 for setting the temperature of the test piece 6 is connected to the computing device 7. Furthermore, heater power control circuits 12a, 12b, and 12c for controlling each of the heaters a, 1b, and Ic1 are connected to the power side of the computing unit OFF-3, and this heater power control circuit 12a.

12b and 12cK are respectively digital-to-analog conversion W
13a, 13b, 13c・thyristor drive circuit 14a,
14b, 14cm Thyristor 15a, 15b.

15c is provided. When adjusting the temperature, the temperature to be maintained at the test piece B is set on the temperature setting device 6. ,, heated body temperature detector aa, 4b.

4c, the analog signal output from the furnace temperature detector 5 is sequentially scanned by the analog switch 8 which is switched in response to all the selection signals from the switch selection circuit 11, and is converted into a digital signal through all the analog-to-digital converters 9. After being converted into , it is input to the arithmetic unit 7 . The computing unit 7 first compares the signals from each of the heated body temperature detectors 4a, 4b, and 4c with the setting signal of the temperature setting device B, and if there is a deviation, adjusts each of the electric furnaces 2 according to the deviation. Heaters 1a, 1b.

In order to calculate the power to be supplied to 1C and control the heater power, a digital signal corresponding to the power to be supplied is output. This digital signal is sent to the digital-to-analog converter 1
After being converted into analog signals by thyristor drive circuits 14a, 14b, 14c, thyristor x 415a, 15b.

15c is activated to send power to heaters 1a, 1b, and Ic.

During this process, when the test piece 6 is heated and the temperature rises to near the set temperature, the heated body temperature detectors 4a and 4b.

When the deviation between the signal from 4C and the setting signal of the temperature setting device 6 becomes extremely small and becomes below a predetermined value, the calculation device 7
determines whether the heating process is complete. When the outer width is completed, the calculator 7
are "4i thermal body temperature detectors 4a, 4b.

4C and the signal from the furnace temperature detector 5, the temperature difference between the temperature of each part of the test piece 6 and the furnace temperature, and
Each heater J1a, 1b for heat retention.

The ratio of the power to be supplied to each heater 1a is calculated based on the signal from the furnace temperature detector 5.

A heater power control signal is output to maintain the temperature of the test piece 6 constant while maintaining the power supply ratio to 1b and 1c.

As described above, according to this apparatus, the heaters 1a, 1b, 1c are controlled based on the detection signals of the heated object temperature detectors 4a, 4b, 4c during the temperature raising process, so that the test piece can be tested accurately and quickly. 6 mixed Ik□ adjustments can be made. In addition, during the heat retention process, the heaters 1a, 1b, and 1c are controlled based on the detection signal from the furnace temperature detector 5, so that when the test piece 6 is significantly deformed or destroyed due to various tests, Piece 37: Even if the heated body temperature detectors 4a, 4b, and 4C are separated from each other and show a value different from the actual value, there will be no problem, and the temperature difference between the test piece temperature and the furnace temperature can be calculated in advance. Since the temperature has been treated, the test can be continued while maintaining the same temperature and there is no risk of error.

[Brief explanation of the drawing]

, 1 is a block diagram showing the configuration of an embodiment of the present invention, 1a, 1b, Ic&j heaters, 2 an electric furnace,
6 is a test piece, aa, ab, 4c is a heated body, 1 summer blower,
5 is a furnace temperature detector, 6 is a temperature setting device, and 7 is a computing unit. Patent Applicant: Stocks, Corporate Equity Test Stack Agent, Patent Attorney
Tetsuya Mori Patent Attorney Naito
Masaru Shimizu

Claims (1)

[Claims] An electric furnace having a plurality of beads 4'f is provided, and a plurality of heated objects are attached to the heated object charged in the electric furnace to detect the height of the heated object 1&. a body temperature detector; an in-furnace temperature detector that is placed separately from the heated body in the electric furnace and detects the in-furnace temperature;
A temperature setting device that sets the temperature of the heated body, the heated body temperature detector, the furnace temperature detector, and the temperature setting device are connected, and the output signal and temperature of each heat transfer body temperature 8#m device are connected. Compares the setting signal of the setting device with the setting signal, calculates the power to be supplied to each heater according to the deviation, and outputs a heater power control signal. When the bias reaches a predetermined value or less, the difference between the heat transfer body temperature and the furnace temperature and the power to be supplied to each heater are determined from the output signal of each heat transfer body width detector and the output signal of the furnace temperature detector. ratio of 1
ft calculation, then calculates the electric power to be supplied to the valley heater based on the output signal of the furnace temperature detector, and outputs the entire heater power control signal. Temperature control device.