JPS6053780A - Controller for insertion of electrode into direct conductiontype melting treating 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] [Industrial Application Field] The present invention relates to an electrode insertion control device for a direct energization type melting processing furnace, and in particular, it inserts an electrode into the furnace in accordance with the consumption of the electrode. Regarding a control device.

[Prior Art 1] Conventionally, a direct energization type melting furnace has been used as one of the melting processing apparatuses for glass raw materials, various industrial wastes, municipal garbage, etc.

This direct current type melting furnace is a heating furnace that forcibly passes a current of 1 J through the material to be melted, thereby generating Joule heat to make the material to be processed thirsty and melting the material.

The above-mentioned direct energization type melting processing furnace has a first electrode, a second electrode, and a plurality of electrodes inserted into the object to be processed, which directly conduct electricity into the object to be processed.

However, the length of the electrode becomes gradually shorter as time passes due to erosion or abrasion caused by the object to be treated. Therefore, the distance between the electrodes gradually improves,
The electrical resistance between the electrodes increases. As a result, the amount of current decreases at the same voltage, making it impossible to maintain a constant molten state of the object to be processed inside. In this case, if the amount of current is adjusted to remain constant, because the resistance is large, a -2- required amount of Joule heat will be generated and the object to be processed will be heated too much. , the molten state changes and wasteful energy is consumed.

Therefore, as the length of the electrodes is gradually reduced, it is necessary to insert the electrodes into the furnace so that the distance between the electrodes within the furnace is always a constant length.

However, since the adjustment work involves electrodes that are carrying a high current and are under high temperature, in reality, the electrodes are considerably worn out and the time is shortened due to concerns about safety and the complexity of the adjustment work. Adjustments between the electrodes could not be made until after that. As a result, more current is passed than necessary, or the current is insufficient, making it difficult to precisely control the temperature inside the furnace or the melting state, which has an adverse effect on the quality of the objects to be processed inside.

[Object of the Invention] Therefore, an object of the present invention is to provide a control device that automates the above-mentioned dangerous and complicated adjustment work and that maintains the distance between the electrodes inside the furnace almost always constant. So (do).

Configuration 1 of the Invention The main feature of the present invention is as shown in the basic configuration diagram of FIG. In the electrode insertion control device M4 of the direct energization type melting furnace M3, the electrode M1 is inserted into the instant melting furnace M3 and is inserted into the instant melting furnace M3 using Joule heat. Electrode insertion means M5 for inserting
and the electric resistance value detecting means M6 for detecting the resistance value of the electric resistance 11 between the electrode M1. When the electric resistance value between the electrode M1 exceeds a predetermined value, the first stage M5 of electrode insertion is driven, and the electric resistance value detecting means M6 detects the resistance value. The insertion control device M4 of the directly energized melting furnace M3 is characterized in that it is equipped with a control means M7 for controlling the insertion of a predetermined amount into the melting furnace M3.M8 is a power source. .

Next, embodiments of the present invention will be described based on the drawings.

[Example 1-4- Fig. 2 is a schematic system diagram showing one embodiment of the electrode insertion control device for a direct current type melting processing furnace of the present invention. Here, reference numeral 1 indicates a direct energization type melting furnace, which is made of a refractory material, and has two electrode insertion holes 5, 6 in the furnace wall 3 on the side thereof, symmetrical to the central axis of the melting furnace 1. ing.

An electrode 7.8 made of metal molybdenum or graphite is supported by an electrode holder 9.10 and inserted into the electrode insertion port 5.6, and the tips 7a and 8a of the electrode 7.8 are connected to the melting furnace 1. It has invaded the object to be processed 11 inside.

The one electrode 7 is connected to the conductor 11A13, and the conductor 1
Is the other end of 3 electrical? l! It is connected to one pole of 15. The other electrode 8 is connected to the S line 17 and to the other pole of the power source 15 via a switch 19 and an ammeter 21.

Further, a voltmeter 23 for measuring the voltage between the electrodes 7.8 is connected between both conductive wires 13.17.

In addition, the electrode 7.8 is equipped with an electrode insertion device 25.27-5.
- is taken out, and the drive device 29.31 sends out the electrode 7.8 toward the inside of the melting furnace 1 as necessary. The electrode insertion device 25.27 holds the electrode 7.8 with two rollers.
] - For the rotation of the servo motor etc. connected to
4i7.8 into the melting furnace 1 as required. The drive device 29.31 is
-Control the current flow and energization time to the motor 11! JruJ, sea urchin composition 1J can be done.

11t1, the electrode holders 9 and 10 have completely sealed cold water passages 9a and 10a formed therein, and the cooling water passages are formed in accordance with the cut gates of the cut valve 33. Cold fJl water is supplied or stopped into 9a and 10a. However, when the cooling water is stopped, the cut-off valve 33 directs air to the cooling water passage 9a of the electrode holder 9.10.
, 10a, and the cooling water inside is completely replaced with air. Further, the switching valve 33 is connected to the drive device 35 to
The cooling water and air are switched as described.

Further, a temperature detector 37 for detecting the surface temperature of the electrode holder is attached to the surface of the inside of the processing furnace 1 of one electrode holder 10, and outputs a signal corresponding to the temperature of the inside surface of the processing furnace 1 of the electrode holder 10. There is.

39 is an arithmetic control circuit, which based on the signals input from the current it 21 , the voltmeter 23 and the temperature detector 37,
By outputting a drive signal to the drive device 29.31 of the electrode insertion device 25.27 or the drive device 35 of the switching valve 33, the insertion amount of the electrode 7.8 or switching of the switching valve 33 is controlled.

The arithmetic control circuit 39 is constituted by a microcomputer, as shown in FIG. Here, calculation control circuit 3
9 is a CPU 40, a fixed memory ROM 41 that stores control programs and various data necessary for calculations, a RAM 42 for temporary storage, and a battery that backs up the power supply so that the memory is retained even after the power switch is turned off. The device includes a backup RAM 43, input/output capos 1 to 44, and an output port 45, and each element is connected to a pass line 46. The input/output capo] to 44 are connected to an ammeter 21, a voltage j1 via a buffer circuit 47, 48, 49, a multiplexer 5-7-0, and a
23, the output signal of the furniture detector 37 is connected. In addition, from the output capo I~45, the drive circuit 52.53.571
A control signal is output to each of the drive circuits 52.5 and 52.5.
3.54 is the drive device 2 of the electrode insertion device 25.27, respectively.
9.31 and the a drive device 35 of the switching valve 33.

Above) 5'i4X pole insertion device with hole configuration 425.2
The combination of 7 and 29.31 corresponds to the electrode insertion means, the combination U of the current h121 and voltage 23 corresponds to the electric resistance 11ti detection means, and the arithmetic control circuit 39 corresponds to the control means. Applies to.

Next, a flowchart of a first control example applied to this embodiment and executed by the arithmetic control circuit 39 is shown in FIG. 4. Here, 110 represents the initial +111 setting. For example, this is a process of driving the cooling water cutoff valve 33 and setting the cooling water to flow through the electrode holder 9.10.12
0 is based on the detection signal from the current h121, and the current amount is A.
This represents the step of reading the voltage as V based on the detection signal from 123 and 1. 130 represents a step of calculating the electrical resistance value between the electrodes 7.8. Here, the electrical resistance value R is R=V
It is calculated using the formula /A. 140 represents a step of determining whether the electrical resistance value R determined in step 130 is greater than or equal to a predetermined value R1. 150 represents a step of switching the switching valve 33 from the cooling water side to the air side to supply air to the electrode holder 9.10. The process of step 150 raises the temperature of the electrode holder 9.10, melts the stuck substances 11a111b around the electrode 7.8 shown in FIG.
This is done to ensure smooth movement of the electrodes 7.8. Returning to FIG. 4 again, 160 represents a step of reading the condition of the inner surface of the processing furnace 1 of the electrode holder 10 as Th based on the detection signal of the temperature detector 37. 170 represents a step of determining whether the temperature Th determined in step 160 is 800° C. or higher. 180 is electrode insertion device @
0 represents the step of outputting a drive current to each drive device-9-29,331 in order to drive only the portion where the resistance that has been increased by a predetermined amount, for example, 25.27, is returned to its original value.
190 is the current as in step 120! This represents the step of reading iA, voltage V, etc. 200 is step 130
Similarly, the electrical resistance value Rt [Table 4 steps to calculate? 1.
21 (1 is the same as step 140) Electrical 11 (anti-ifi
'1J represents the step of determining whether l'< is greater than or equal to the predetermined value R1. Step 220 switches the switching valve 33 from the air side to the cold 7J1 water side and cools the electrode holder 9.10)
J+ represents the step of supplying water.

To prevent thermal deterioration of the electrode 7.8 and holder 9.10, etc., cover the area around the m1 electrode 7.8 with a solidified substance, and cover the area between the electrode holder 9.10 and the electrode 7.8. This is to prevent the material to be processed from leaking out.

When the process of the first control example described above is started, first, 7 initial settings are made to the slap 110. Then step 12
0 is executed, and the current fM A and voltage V are detected and read. Next, in step 130, the electrical resistance value R is calculated using the above-mentioned V and the value of R, and in the next step 140, the electric resistance value R is compared with the predetermined value R1 based on the value of R in A. It will be done.

If the distance between the electrodes 7 and 8 is an appropriate distance, R is less than R1, so it is determined that it is rNOJ, and the process returns to step 120 to start the process of reading the current amount and voltage. .

In this way, as long as the distance between the electrodes 7.8 is an appropriate distance, steps 120.130.1
40 processes will be repeated.

Next, when the electrodes 7 or 8 become shorter due to wear, erosion, etc., the resistance between the electrodes 7 and 8 increases, but if the resistance exceeds the predetermined value R1, rYEsJ is determined in step 140. It will be judged.

Then step 150 is performed, in which the electrode holder 9.1
0, the supply of cooling water is stopped by the action of the switching valve 33, and the air is replaced.

Next, step 160 is executed and the temperature Th of the surface of the electrode holder 10 is read. Usually, electrode holder 10
Since the inside is cooled with cooling water, the temperature detected by the temperature detector 37 is around 100°C, but in the process of step 150 -11- the cold water is stopped and air is replaced. Since the electrode holders 9 and 10 are replaced, the temperature of the electrode holders 9 and 10 will rapidly rise to - due to the heat in the furnace. and 800℃
(at step 170 it is determined that rNOJ is less than
? Step 160 is repeated, but FA
If 7h exceeds 800°C as the above continues, it is determined in step 170 as ``YES, 1.'' This indicates the temperature at which the solidified material 11a)?Cσ111) in the furnace 1 is completely melted. I'm having trouble determining what I've exceeded 1
3. Next, step 180 is executed, the electrode insertion device is driven for the first time, and the electrode 7.8 is inserted into the ready furnace 1 for melting a given product. Next, step 190 is executed and the current amount A and voltage ■ are read, and then step 200 is executed.
In step 210, the electrical resistance value R is determined, and then in step 210 it is determined whether the electrical resistance value R is greater than or equal to R1. Even if a certain amount of electrodes are inserted in one execution of step 180, the electrical resistance value R must be less than R1.
80 is executed, and a certain amount of electrode is inserted for the second time. In this way, the electrode insertion process is repeated until the electrical resistance value R becomes less than the predetermined value R1.

When the distance between the electrodes 7 and 8 is reduced to an appropriate distance and the electrical resistance R is less than the predetermined value R1, rN is determined in step 210.
OJ is determined, and then in step 220 cooling water is supplied to the electrode holder 9.10 by switching the switching valve 33.

As a result, the solidified materials 11a and Ilb of the object to be processed 11 are again fixed to the surface of the electrode holder 9.10 exposed in the melting processing furnace 1 and its vicinity. As a result, the space between the electrode 7.8 and the electrode holder 9.10 is sealed, and leakage of the molten material of the object to be treated 11 can be prevented. The process then returns to 120 and repeats the process as described above.

As described above, according to this control example, by always maintaining the distance between the electrodes 7 and 8 at an appropriate distance, it is possible to contribute to improving the efficiency of the melting operation and saving electrical energy, and furthermore, it is possible to contribute to improving the efficiency of the melting operation and saving electric energy. By melting 11a, -13- 1111 in advance before inserting the electrode, there is no need to push in the N electrode 7.8 with more force than necessary, the insertion device 25.27 can be a simple device, and the electrode 7.8 can be easily inserted. WA will not be damaged.

Next, FIG. 5 shows a second control example. This second control example
This is an example of control in which control for instructing when to take care of the electrodes is added.

Here 320.330.340, 350.360
．． 3370.390.410.420.430 and 44
0 is step 120.130.140.1 of the first control example
50.160.170.1801190.200.21
Same processing as each step corresponding to 0 and 220 1
represents the step of performing jjlj.

Reference numeral 310 represents a step of initializing the electrode holder 9 in the initializing of step 110 of the first control example.
In addition to switching the switching valve 33 to supply cold IJ+water to the electrode 7.8, the length 1- of the electrode 7.8 is also set. 380 indicates a step of determining whether the length L of the electrode is equal to or less than a predetermined value 1a l-1. The step of setting the value obtained by subtracting the predetermined length a from 400 as a new value is not shown. 4504; i-electrode 7.
J represents the step of outputting a warning message to replace 8 using a buzzer or warning lamp.

When the second control example as described above is started, as in the first control example, as long as the electric resistance value R is less than the predetermined value R1, the current amount A1 voltage V is read, and the calculation process of the electric resistance value R is performed. Repeated. Then, the electrical resistance value R is a predetermined value R1
If this is the case, rYEsJ is determined in step 340, and then in step 350, the supply of cooling water to the electrode holder 9.10 is stopped and the inside is replaced with air. Next, in steps 360 and 370, the workpiece 1
If the solidified materials 11a and 11b of No. 1 are melted, it is determined in step 370 that the solidified materials 11a and 11b are rYEsJ. Step 380 is then executed and it is determined whether the length of the electrode 7.8 is less than or equal to a predetermined length of 1 ml. Here, the length of the electrodes is updated when electrodes 7 and 8 are replaced. This value of L is also stored in the backup RAM 4-3, and the power to this control device is turned off to stop the operation of the entire system.
After that, when the ill IU control device starts operating, it is possible to compare the quality of the previous electric 14i7 and R3. With this slap 380, electrode 7 is still
．． If 8 is exhausted and 1- is a value exceeding 1-1, it is determined that r N 01, and then step 390
is executed, the electrode insertion means is driven, and a predetermined amount of electrodes 7.8 are inserted into the melting processing furnace 1. Next, in step 400, 1- is set to the value 1--a. Here, the value of a represents the amount inserted in step 390 -1-. That is, in order to record that the quality L of the electrode has become smaller by the predetermined length a in step 390, L is subtracted in step 400. Then step 4
At step 10, the current @A and voltage V are read, then at step 420 the electric resistance value Rlfi is calculated, and then at step 430 it is determined whether the electric resistance value R is greater than or equal to a predetermined value R1. If the resistance value is still at an appropriate value (J, return to step 380 again, the length L of the electrode 7.8 is compared with 11, and if L is still not less than Ll-16-, step 380 is performed again. 390 will be executed and the process of inserting the electrode will be repeated.The above steps 380.390.400.410, 4
20.If R becomes less than R1 before L becomes less than 1 by repeating 430, rNO is determined in step 430.
J is determined, and then in step 440 cooling water is supplied to the electrode holder 9.10 by switching the switching valve 33. and again step 320
This will return to processing.

On the other hand, while repeating the above steps, if L becomes less than L1 before R becomes less than R1, step 380
rYFsJ is determined in step 450, and step 450 is then executed. At step 450, a buzzer or lamp notifies the supervisor that replacement is necessary, and water control is terminated and control of electrode insertion is stopped. Thus, the replacement warning display allows the supervisor to stop the operation of the melting furnace 1 and replace the electrodes 7.8 at an appropriate time.

-17- As mentioned above, according to this control example, in addition to the effects of the first i11 control example, the life of the electrode 7.8 can be automatically checked, and the electrode 7.8 can be removed at an appropriate time until Because moss may form, it is difficult to replace the electrode with one that is still usable, or to become unnecessarily short and control the distance between the electrodes becomes a national problem, contributing to resource and energy conservation. It is something.

[Effect of the invention] Direct energization type WI melting point 1q of the present invention! In the electrode insertion control device of a direct current melting furnace, the electrode is inserted into the workpiece and the workpiece is melted by Joule heat. an electrode insertion means for inserting the electrode into the furnace; an electric resistance value detection means for detecting the electric resistance 1/i between the electrodes; Since the distance between the electrodes is always maintained in an appropriate state, electrical energy is efficiently converted into thermal energy. This contributes to energy conservation, maintains the quality of the molten material in the furnace at a constant level, increases yield, and contributes to resource conservation. Furthermore, as a secondary effect,
It also leads to complete work.

[Brief explanation of the drawing]

Fig. 1 is a basic configuration diagram of the present invention, Fig. 2 is a schematic system diagram showing one embodiment of the invention, Fig. 3 is a block diagram of its arithmetic control circuit, and Fig. 4 is the first embodiment of the above embodiment. FIG. 5 is a flowchart showing a second control example. 1... Direct energization type melting furnace 7.8... Electrode 9.10... Electrode holder 21... Ammeter 23... Voltmeter 25.27... Electrode insertion device -19- 33 ...Switching valve 37...Furnishing detector 3 'l'3-...EnnIt, 1 all times n1 Agent Patent attorney Tsutomu Seitate and 1 other person -20-

Claims (1)

[Scope of Claims] An electrode insertion control device for a direct current type melting furnace that inserts an electrode into a workpiece and melts the workpiece using Joule heat, an electrode that inserts an electrode into the melting furnace. an insertion means; an electric resistance value detection means for detecting an electric resistance value between the electrodes; and when the electric resistance value between the electrodes exceeds a predetermined value, the electrode insertion means is driven and the electrode is placed into a melting processing furnace. 1. A control device for controlling the insertion of an electrode in a direct current melting furnace, comprising: a control means for controlling insertion of a predetermined amount.