JPS58193084A - Controller for temperature in case of discharge from furnace of material to be heated of heating 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 provides a furnace temperature control device for a heating furnace, such as a heating furnace for glass strengthening, by measuring the temperature, temperature distribution, etc. of a heated object immediately after leaving the furnace. The reference temperature, which is the control target value, is automatically changed and adjusted. {4+ automatic correction device is attached to control the temperature of the heating and resting furnace of the heating furnace, which can achieve long-term stabilization of the unloading temperature of the heated object, complete automation of control, and improvement of control accuracy. Regarding equipment.

3 and 4 show the structure of an electric furnace for glass strengthening as an example, which is the technical premise of the present invention.3 To outline the structure of an electric furnace for glass strengthening, 30 is a heating furnace, The furnace 30 has narrow chambers 30a arranged in series, for example.
．． It is divided into chambers 30b and 30C, and these chambers 30
a, 30b.

Heaters 61, 31 are arranged on each inner wall surface of the heating furnace 30, and the glass 62 is transferred in the direction of arrow A by a transfer device (not shown) in the heating furnace 30, and then molded in the final chamber 30C. It can be heat-treated to reach a predetermined temperature convenient for strengthening. After that, crow 32 is in room 30.
It is carried out from C to the upper chamber, molded into a predetermined shape by a pressing machine 33 after being taken out of the furnace, and then cooled by a quenching blower 34 and transferred to the next process.

A conventional five-control system for controlling the temperature of the heating furnace 30 as described above is constructed as shown in FIG. This temperature control is originally used to mold the crow into a predetermined shape using the suppressor 36 and to strengthen the formed crow using the quenching blower 34, in order to make the crow quality such as the degree of reinforcement and perspective distortion the predetermined ones. It is essential that the temperature of the glass immediately after unloading must be exactly at a predetermined temperature.

Therefore, the conventional control device detects the temperature inside the furnace by disposing a thermocouple thermometer 1 such as an alumel-chromel couple at a position approximately in the center of the heating furnace 30, and detects the temperature inside the furnace. The detection signal is amplified by an amplifier 2, and then inputted to an analog controller 3 that performs PID control operation, and compared with a reference furnace temperature, which is a control target value that has been appropriately set artificially in advance, to calculate the deviation. The device is configured to provide a required control signal 81 obtained based on the deviation to the operating device 4 having a gate function, such as an SCR (thyristor). For example, in the SCR, the phase is controlled by the control signal S1, and the amount of current supplied to the furnace heater 6 is appropriately adjusted. By applying the manipulated variable, control is performed such that the furnace temperature is made to substantially match the reference furnace temperature, which is the control target value.

However, the conventional blowdown control device as described above has the following disadvantages: 3. Although the purpose of this control is originally to bring the temperature of the glass immediately after leaving the furnace to a predetermined temperature, First, we do not directly measure the temperature of the glass immediately after it is taken out of the furnace, but instead measure the temperature inside the furnace, which is determined by radiation from the furnace heater and the furnace wall, and control is performed based on this. It is very difficult to bring the temperature of glass, which is heated mainly by radiation from the furnace heater, to the correct temperature immediately after it is taken out of the furnace, and in general, with conventional equipment, the temperature at which the glass is taken out of the furnace decreases as time passes. There is a tendency to This is because the temperature inside the furnace is measured to be higher due to radiation from the furnace wall, or the crow immediately after being taken out of the furnace is affected by the outside environment. In this way, under conventional conditions, the temperature at which the glass is taken out of the furnace fluctuates in a manner that lowers it over a long period of time, so in order to avoid such situations as much as possible, people must constantly monitor the condition of the electric furnace and take measures to deal with such fluctuations. The reference furnace temperature set in the controller 6 as the control target value must be appropriately changed and reset (there arises a problem of the adjustment of M, and conventionally, the furnace temperature of the object to be heated is It has been difficult to achieve long-term stability, complete automation of control, and improved accuracy.

It is thought that such a problem is not only a problem related to control in a heating furnace for glass strengthening, but also a general problem with heating furnaces of the same type.

In addition, in this type of heating furnace, it is necessary to heat the object to be heated so that a predetermined temperature distribution is formed by dividing the heating means and varying the amount of heat generated by each heating means. In some cases, such heating furnaces require even more precise control of the furnace temperature.

In view of the above-mentioned problems and demands, the present inventors have created the present invention in order to effectively solve the problems.

The first aspect of the present invention provides automatic correction in a furnace temperature control device of a heating furnace, which detects the temperature of a heated object immediately after unloading and automatically adjusts a reference furnace temperature, which is a control target value, based on the detected temperature of a heated object immediately after unloading. The purpose is to provide a device with a simple configuration, to stabilize the temperature at which the heated object is taken out of the furnace over a long period of time, to completely automate the sterilization of the furnace temperature, and to improve control accuracy.

The second aspect of the present invention provides a furnace temperature control device for a heating furnace that detects the temperature distribution of a heated object immediately after unloading, and based on this detects the reference furnace internal temperature, which is a control target value, and the calorific value of a plurality of independent heaters. The aim is to provide an automatic correction device that can automatically adjust all the ratio values, and to achieve long-term stabilization of the temperature distribution and the temperature distribution of the heated object in the same way as mentioned above.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows an embodiment according to the first invention. This embodiment is based on the above-mentioned basic technology, and consists of a thermocouple thermometer 1, an amplifier 2, an analog controller 6 that performs PED control operation, an operating device 4, etc., and detects the temperature inside the heating furnace 5 and adjusts the current supply ikk. By doing so, the furnace temperature control device that controls the calorific value Q of the heater 6 disposed in the heating furnace 5 is configured to be provided with an automatic correction device having the following configuration 917.

1. A radiation thermometer 8 capable of detecting the temperature of glass 7 immediately after unloading from the heating furnace 5, and detection related to the glass temperature of glass and cloth immediately after unloading obtained by the radiation thermometer 8. A first computer 10 inputs and stores the signal after being digitized by an A-D converter 9, and a first computer 10 receives necessary data regarding the glass temperature immediately after being taken out of the furnace and is provided separately in advance. (
P), the data is compared with the reference temperature value of the glass, which is the control target value prepared in the storage section, and based on the deviation, the reference temperature value is sent to the analog controller 6 via the D-A converter 11. An automatic correction device is provided which includes a second computer 12 that automatically changes and adjusts the set values in the analog controller 3 by resetting them based on the furnace temperature. As is clear from such a configuration, the automatic correction device uses the analog controller 3 in the furnace temperature control device provided to control the furnace temperature of the heating furnace 5.
The reference furnace temperature, which is a control target value that was conventionally set and changed manually one after another, is automatically changed and set using the computer 10.12' based on the glass temperature immediately after unloading. Therefore, it has the function of correcting the reference furnace temperature.

As the radiation thermometer 8, a scanning radiation thermometer such as the Pyroscanner (Chino Seisakusha), which has already been proposed, is used, and depending on the type and configuration of the thermometer used, either relative temperature or absolute temperature can be used. Temperature data can be detected at a required number of measurement points over the entire surface of the glass, and such temperature data is digitized by the A-D converter 9 and transferred to the computer 10.

The computer 10 is, for example, a microcomputer, and stores the transferred temperature data at predetermined measurement points over the entire area of the crow 7 in its storage section.

Thereafter, at a predetermined timing, at an appropriate timing, data at a predetermined position (for example, 9 representative positions) is selected from the input 8 degree data regarding the temperature distribution of the glass 7, and the data is transferred to the computer 12. Ru.

For example, the computer 12 is a microcomputer, which averages the input temperature data of a plurality of glasses for each predetermined position, and calculates the average temperature at one point and a standard related to the glass stored in the storage unit in advance. Compare with temperature. In this case, various reference values may be stored and prepared depending on the type of glass, and the reference temperature used for comparison and judgment may be changed as appropriate depending on the case.

According to the above embodiment, by measuring the temperature of the glass immediately after unloading and comparing this actual measurement value with a reference value, conventionally the analog controller 3 automatically stabilizes the furnace temperature over a long period of time. becomes possible.

Here, to describe an example of a signal processing method, for example, 1000 points of temperature data are measured and detected from one glass 7, these are stored in the computer 10, and a predetermined position is selected from among the measured values of these 1000 points. (approximately central position of the glass) is transferred to the computer 12.

The computer 12 calculates the average value of the measured values transferred from the computer 10 for each glass to be unloaded and corrects the average value. The reference value related to the glass temperature is compared, and the reference value related to the furnace temperature in the controller 6 is changed or adjusted based on the deviation. Normally, the unit number of sheets is approximately the number of sheets per 30 minutes, for example.

The reason why the computer 12 uses the average value for each unit number of glass 7 taken out of the furnace in the comparative judgment is that the measurement data for the glass 7 originally varies widely, and therefore the computer 12
The method of directly controlling the controller 4 and eventually the heater 6 with the output of 2 was not adopted, but first, in order to control the furnace temperature, all reference values related to the furnace temperature in the controller 6 were changed, and then the heater 6 An indirect method is adopted in which the heating value of the glass is adjusted to bring the glass out of the furnace to a predetermined temperature. In this way, the temperature at which the glass is taken out of the furnace can be stabilized over a long period of time.

Further, although the above embodiment is configured with two computers, data transfer can be controlled by any of the computers, and it is also possible to configure the system with a single computer. Furthermore, it is also possible to construct air mass routes using wired logicte without using a computer.

In the above invention, the heater 6 disposed in the heating furnace 5 is divided into one or more zones, and when the heater 6 divided into the multiple zones is supplied with current at a fixed predetermined ratio, This was related to such control. Next, FIG. 2 shows an embodiment according to the second invention. In the present invention, the heater in the furnace is divided into sections, and the amount of electricity applied to each of the plurality of heaters in each section is independently controlled, thereby making the temperature of the glass heated by each heater different for each section. It is impossible to control it like this.

In FIG. 2, a heating furnace 5, a thermocouple thermometer 1 in a furnace temperature control device, an amplifier 2, an analog controller, a radiation thermometer 8 in an automatic correction device, and a computer 10 are shown.
Although there are some functional changes, these components are substantially the same as those shown in FIG. 1 as an embodiment of the invention, and are designated by the same reference numerals.

The heater 16 disposed in the heating furnace 5 is divided into nine sections, for example, and a heater is provided in each section 16a. It is now being supplied. Therefore, in order to appropriately adjust the amount of current supplied to each heater, nine current adjustment actuators 4, such as SCRs, are provided corresponding to the heaters in each section.
・ will be provided. As mentioned above, the analog controller 6 compares the reference value of the furnace temperature given and set by the computer 12 with the actual 1flll value, and based on the deviation and this (PII) control operation, the required control signal S1 is generated.
It is assumed that the control signal Sl is amplified by the amplifier 17 and then given to each of the operating devices 4 after being subjected to the following predetermined signal processing.

That is, between the amplifier 17 and each operating device 4, there is a ratio divider 18 formed by, for example, a multiplication/division calculator.
are provided corresponding to the respective operating devices, and each ratio divider 18 receives a control signal input from the amplifier 17 by setting a predetermined ratio value independently under the control of the computer 12. The measurement points of the furnace temperature measured by the thermocouple thermometer 1, which is used to send such control signals to the respective corresponding operating devices 4 after adjusting the phase of S1 at a constant ratio for all stages, are as follows. As in the case of the first invention, it is a point located approximately at the center of the heating furnace 5. In addition, the number of measurement points related to the temperature distribution of the glass 7 measured by the radiation thermometer 8 and stored in the computer 10 is increased in view of the fact that the temperature of each part of the glass is controlled to be different in this invention. As the points are selected, computer 1
The number of actual measurement data related to the glass temperature transferred from 0 to the computer 12 also becomes at least the mathematically predetermined number of the above sections.

This means that the reference furnace temperature of the analog controller 3,
By adjusting each ratio value of the ratio distributor 18, all nine heaters for each section can be properly and independently controlled to maintain a constant temperature in order to bring each part of the glass 7 to the required temperature. This is because it is necessary to create a distribution.

The reason why the glass 7 is heated to create a predetermined temperature distribution is because there is a social demand for tempered glass of various thicknesses, and for this reason, the computer 12 also has temperature distributions for various types of glass. By storing and preparing the reference setting values in advance, the designer can select and use appropriate reference values depending on the situation. In this way, the versatility of the control according to the present invention can be increased.

In this manner, in the second computer 12, a predetermined number of standard set temperatures related to the temperature distribution of the glass to be heated and molded are given in advance by a program in correspondence with each part and stored in its storage unit. The transferred actual measured temperature is compared with the reference set temperature, and based on the deviation, the computer 12 sends a message to the analog controller 6, each ratio distributor 18, and the respective D-A converters 19, 20. Reference furnace temperature, via
It functions so that the ratio setting value is set for each force.

According to the above configuration, the temperature distribution of the glass immediately after leaving the furnace is m+
The measured data related to the detected temperature distribution can be compared with the temperature distribution of the glass, which is the control target prepared in advance in the Gombuke 12, and the controller 3 of the furnace temperature control device can Setting value, newly added ratio divider 18.
In order to bring the temperature distribution of the glass closer to the target by adjusting each ratio setting value of each section 16a, .
The amount of heat generated by the heaters is controlled independently and separately.

Also in the present invention, the actual measurement data regarding the temperature distribution of each glass, which is measured by the radiation thermometer 8 and stored in the computer 1o, can be printed out using a line printer as appropriate.

The above-mentioned second invention is constituted as the entire basis of the above-mentioned first invention.

Although the content of the present invention has been clarified through the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that the principles can be changed as desired without departing from the gist thereof. . For example, the present invention can also be applied to a furnace temperature control device for a heating furnace heated by a gas burner. Further, the present invention can be applied not only to glass strengthening heating furnaces but also to various types of heating furnaces, and is a highly applicable furnace temperature control device.

Furthermore, it is also possible to use a digital controller instead of an analog controller as the controller 3, and in this case, some changes in circuitry are required.

As is clear from the above explanation, according to the present invention, the reference value, which is a control target related to the temperature inside the furnace, is appropriately changed at predetermined time intervals using a computer or the like based on the temperature of the heated object immediately after leaving the furnace. The temperature control of the heating furnace takes into account the temperature change of the heated object itself immediately after unloading, in addition to the change in the furnace temperature, which stabilizes the unloading temperature of the heated object over the long term.
Complete automation of control and improved control accuracy can be achieved, and furthermore, by storing data related to the temperature of various heated objects, it can contribute to various types of control. do.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a block diagram showing an embodiment of the device configuration according to the first invention, and FIG. 2 is a block diagram showing an embodiment of the device configuration according to the second invention. , 3rd
The figure is a front view showing an example of a heating furnace, and Figure 4 is 4-4 in Figure 3.
A 4-line sectional view and FIG. 5 are block diagrams showing the configuration of a conventional furnace temperature control device. In the drawing, 1 is a thermocouple thermometer, 3 is a controller, 4 is an operator, 5 is a heating furnace, 6.16 is a heater, 8 is a radiation thermometer, 10.12 is a computer, and 18 is a ratio distributor. . Patent applicant: Nippon Sheet Glass Co., Ltd. Agent: Patent attorney Yoichi Shimoda Patent attorney: Kunihiko Ohashi Figure 5, v. 34

Claims (6)

[Claims] (1) The temperature inside the heating furnace is measured and detected using a thermometer installed in the heating furnace, and the detected measured value is compared with a reference value related to the temperature inside the furnace that is set in advance by the controller. In a heating furnace that adjusts the calorific value of the heating means based on the deviation, a thermometer that measures the temperature of a heated object after being taken out of the furnace;
The measured value by the thermometer is compared with the reference value related to the temperature of the heated object 1, and based on the deviation, the reference value related to the furnace temperature set in the above controller can be changed. A heating furnace temperature control device for a heated object, characterized in that a formal sleeve is provided. (2) storing the measurement value from the thermometer that measures the temperature of the heated object in the automatic correction device in a storage section, and comparing it with a reference value related to the temperature of the heated object prepared in another storage section; The patented heating furnace temperature control device is characterized in that it is constituted by a computer that outputs a signal for changing the reference value related to the furnace temperature set in the controller based on the deviation. (3) The automatic correction device is connected to a first computer that temporarily stores a measured value from a thermometer that measures the temperature of the heated object in a storage unit, and a first computer to which the measured value stored in the first computer is transferred. Compare this measured value with a reference value related to the temperature of the heated object prepared in the storage unit, and output a newsletter for changing the reference value related to the furnace temperature set in the controller based on the deviation. 2. A temperature control device for a heated object in a heating furnace according to claim 1, characterized in that the device comprises a second computer that performs the following steps. (4) The furnace temperature is measured and detected using a thermometer installed in the heating furnace, and the detected measured value is compared with a reference value related to the furnace temperature set in advance by the controller, and based on the deviation. A ratio distributor that divides the heating means into a plurality of sections and independently adjusts the amount of heat generated by the heating means in each section by a respective ratio value, in a heating furnace configured to divide the heat generation fa f Is of the heating means; The temperature side for measuring the temperature distribution of the heated object after unloading, and the measured value of the thermometer are compared with the reference value related to the temperature distribution of the heated object, and the temperature inside the furnace is set in the controller based on the deviation. Standard values related to temperature
- Change the ratio value set in the ratio divider. What is claimed is: 1. A temperature control device for a heating and resting furnace of a heating furnace, characterized in that the temperature control device is characterized in that the temperature control device is configured to obtain the temperature of a heated and shut down furnace, and is provided with an automatic correction device. (5) The automatic correction device stores the measurement value from the thermometer that measures the entire temperature distribution of the heated object in the storage section, and uses the reference value related to the temperature distribution of the heated object prepared in another storage section. The comparison is made, and based on the deviation, the controller sends respective signals for changing the reference value related to the furnace temperature set in the controller and the ratio value set in the ratio distributor. )
A temperature control device for a heated and dormant furnace of a patented thermal furnace, characterized in that it is constituted by a computer that outputs output to an o-ra and a ratio distributor. (6) The automatic correction device includes a first computer that stores measured values from a thermometer that measures the temperature distribution of the heated object in a storage unit for one day, and the measured values stored in the first computer. This measured value is compared with a reference value related to the temperature of the heated object prepared in the storage unit, and the reference value related to the furnace temperature and the ratio distribution described in riiT are set in the controller based on the deviation thereof. The heating furnace according to claim 4, further comprising a second computer that outputs a signal for changing the ratio value set in the heater to the controller and the ratio distributor, respectively. Temperature control device for heated and closed furnace.