JPS58110622A - Continuous heater with automatic temperature setter - Google Patents

Abstract

PURPOSE:To change set temp. automatically at proper times with a change in types by obtaining the signals indicating the conveying distances of objects to be heated from a conveyor and changing the respective set temps. successively from the blocks where the parts of changed types arrive. CONSTITUTION:An oscillator 41 which is driven by one of conveying rolls 10 generates a specified number of pulse currents per revolution of the roll 10, and outputs the same to an operator 43. The operator 43 calculates the distance C from the inlet end face 45 of a furnace body 1 up to the final end of a type A, the distance D up to the preceding end of a type B after changing, and the moving extent of objects to be heated after the code of the type B is set on a setter 42 for the objects to be heated in accordance with the signals from the oscillator 41. At the point of the time when the objects to be heated arrive at the centers of respective heating chambers 2-7, command signals for changing set temps. and the temp. values corresponding to the codes inputted from the setter 42 are outputted to temp. controllers 21-35, so that the controllers 21-35 operate to change the set temps.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous heating device in which the type of object to be heated is changed, and when changing the heating temperature [1-1], the set temperature of the temperature control needle is automatically changed. K to change to
This invention relates to a continuous heating device.

The continuous heating device is divided into a plurality of tunnel-like spaces, each of which is equipped with a controller, and each section is
Or by controlling a fixed value to an arbitrary temperature #: and transporting the heated @ through it by a transport device, heat treatment is performed with a predetermined heat pattern, with a high heat 9xJ rate,
It is widely used in various fields due to its high productivity. Therefore, a specific continuous heating device is used to process the objects to be heated in a multi-product tank. Therefore, it may be necessary to change the heating temperature ' due to a change in product type.

Conventionally, the heating temperature changes due to a change in the type of heated object! #!
If necessary, a non-charging part t is placed between the product A before the change and the product B after the change, and the product change part between the two products is moved by transportation, and each of the multiple Each time a compartment is reached, the temperature adjustment needle is set at 1 ft - fj manually! A method was adopted to do so. The residence time of the object to be heated in the continuous heating device is often 10-odd hours or more, and in this case, changing the set temperature of all the compartments will take a long time. In addition, in a wire heating furnace for hot processing, etc., one conveyance speed If is determined depending on the work efficiency of the next step such as hot processing, and it may be difficult to predict the time when the foot arm lf will be changed. For this reason, the furnace operator may be forced to wait for a long time due to the setting m1 degrees i*<.

This invention is! It is an object of the present invention to provide a continuous heating device that automatically changes the set temperature every time t1 due to a change in the temperature of a heated object.

The present invention obtains a signal indicating the conveyance distance from a conveyance device that conveys the object to be heated, automatically tracks the part where the product has changed, and sets the set temperature f in order from the section where the part where the product has changed is inferior.
It is a continuous heating device designed to change the temperature.

Conventionally, there is a so-called program control method for automatically controlling the temperature inside the furnace according to a preset heating schedule for patch type heating furnaces, etc., but the present invention is different from this method.

Next, Example t-a will be explained. FIG. 1 is a longitudinal sectional view of a continuous steel annealing furnace showing one embodiment of the present invention. The tunnel-shaped furnace body 1 has heat exchangers M2 to 7 divided by a plurality of layered partition walls 1a, and has a material charging roller table 8 and a material discharging roller table 9 installed at the front and rear of the furnace body 1, respectively. A large number of conveyance rollers 10 are installed in the furnace body 1 to convey the objects A and B to be heated in the direction of arrow A'. Each conveyance roller 10i) is rotationally driven in the same direction at the same circumferential speed by a continuously variable speed drive device (not shown).

On the wall on the other side of the first heating box 2, there are upper burners 11, 12, and 15M that burn fuel and blow out flames above the heated object, and lower burners 14, 15, and 1 that blow out downward.
Similarly, upper burners 11' and 1 are placed on the front wall surface.
2' and 13' and lower burners 14', 15' and 1
6' is installed. Upper burner sets 11 and 11', 12 and 12' and 1s face each other from both walls.
and 13' are temperature controllers 21, 22 and 25M, respectively.
Each set of burners is PID-controlled using a temperature sensor installed at the y-intermediate point. The same applies to the lower burner (the temperature adjustment needle for the lower burner is not shown). The same applies to other heating chambers, although the number of burner sets may differ.

The camera 4 is driven by one of the transport rollers 10.
1 generates a constant number of pulse currents per one rotation of the roller 10, and outputs the odor generator aSK. Also, the heated object setting device 42
For example, the distance C from the inlet end face 45 of the furnace body 1 to the rearmost end of the type A of the object to be heated before R*, and the distance from this rearmost end to the tip trench of the changed type B 11111 Material charging 4 - The value read on the scale 8' attached to the side of the table 8, and the code of type B determined corresponding to the type to be processed are manually set and output to the computing unit 45.

The arithmetic unit 43 calculates the moving amount (distance) of the heated object from time 7'C when the distances C and D and the product code are set in the heated object setting device 42 and the flaw signal from the generator 41. And my father-in-law,
When the distance from the inlet end face 45 of the furnace body 1 to the center of each heating chamber is respectively XI −
x, x+c+ /2-L, aem++7. w4 + C
At the point when +”/-L K becomes equal, each heating@t
IC temperature controller 21.22,...
55K, set temperature f change J! Command number and heated object setting device 4
Temperature controller 2 should output the temperature f [inputted from 2 and displayed 10 times in binary code corresponding to the next code.
1~SSK setting temperature l! Make the change action. Each of the temperature controllers 2-SS does not change the set value even if either the set temperature WK change command signal or the Taki Jaku value signal is missing. L in the above equation takes into account the time delay t until the temperature of the object to be heated actually changes after the completion of the setting temperature change operation, and is determined based on the conveyance speed, furnace characteristics, etc.

FIG. 2 is a diagram illustrating the change of the set temperature in this embodiment, where the vertical axis shows the temperature and the horizontal axis shows the axial position of the furnace. The heated object of type A is continued to be heated by passing through each heating chamber temperature of AI%A-, and the heated object of type B is heated to B, respectively.
- B6 shall be processed. The heated object B after the change is prepared on the material charging roller table 8, and the above-mentioned distance C
, D and the code for type B are set on the heated object setting device ARK, water is drained, and the arithmetic unit asIH monitors the moving amount of the heated object. When it reaches the front side, the upper burner ambient temperature fil1 meter 21
．． 22, 2*M and the lower burner temperature controller output the set temperature removal change command signal and the value of temperature B□ to set the set temperature w1
Have them perform seven changing actions. At this time, the set values of the temperature controllers belonging to each heating chamber are on the inlet side') B1% Ax, A3
, A4, Aa, Aa. As a result, the temperature of the first heating chamber gradually increases from A1 to nl! t, and at the same time #1, the tip of the object to be heated B is in the heating chamber 111. The same applies to the second to 1146th heating chambers. In this way, the entire area inside the furnace is finally B, %B.

The heat treatment of the nine items 11B continues with a temperature distribution of .

The same applies when the set temperature & is changed to a lower value.

In this embodiment, if necessary, a plurality of calculation units can be installed in the calculation unit 43, and objects to be heated of 5 m or more can be heated simultaneously in the furnace body 1.

For example, as shown in FIG. 5, the new arithmetic unit aS/ converts the signal from the general regulator 42 into the arithmetic unit main body yg by the amount of movement of the object to be heated (y)x.+C+.

71 . . . A relay device 60 for relaying K and serving as a register Io. 61 . . . monitors a plurality of arithmetic units 50 and sl . is 0, i.e. y)
10 + D, 4-L ``t' is present, therefore, the heated object setting device is set only in the repeater belonging to the calculation unit 50, sl...K, which has completed the setting temperature change operation for all heating chambers. It has a controller 80 that relays signals from 42.

Although the furnace body of this embodiment has a bottle-shaped 111ak between adjacent sections, there are generally many power q heat furnaces that do not have a section II 1&.
It has nothing to do with the line partition wall 1aO of the present invention.

In this embodiment, the set temperature fi1 in the heating section! The power setting is changed only when there is both the next set temperature WjL change command signal and the temperature value signal. Since all of them, including the above, are converted into digital signals, they are safe from noise and malfunction.In the present invention, the butterfly temperature setting can be changed in multiple steps or can be changed continuously. For example, depending on the characteristics of the furnace, etc., 5L1, Lm? The amount of movement y of the heated object after being determined and set by the heated object setting device 42 is "n + C + 4-
L 1 ()'("n + C+ "4 + Lz
, and if it is within this range, Tn"An+(Bn-An)(F-("+C
A block is added that calculates the temperature value signal Tn from ``shadow-LH) )/(L□+L, )4C, and outputs it to the temperature controller continuously or intermittently (n: section number). In this way. By gradually changing the set temperature*1, a sudden change in temperature at the end of the object to be heated is prevented, and therefore the non-charging part In
It becomes possible to shorten the length.

As explained above, the present invention is characterized by
Since the accompanying heating temperature setting is automatically performed in a timely manner in response to the progress of the object to be heated, it is unnecessary for the furnace operator to wait for a long time just to change the temperature setting.

Note that the present invention is not limited by the object to be heated, the purpose of heating, the heating heat source, the type of conveyance device, etc.

[Brief explanation of the drawing]

Figure 181 shows one embodiment of the present invention. FIG. 82 is a longitudinal sectional view of the annealing furnace, and FIG. 82 is a diagram illustrating changing the set temperature IK. FIG. 5 is a block diagram showing an example of a computing device having a plurality of computing units t. 1; Furnace body, 2-7; Heating chamber, 10; Conveyance roller, 11-
Zero 6.11'-16'; Burner, 21-s5; Temperature controller, 41; Oscillator, 42. ; Heated object setting device 45.4
3'; Arithmetic unit, 8o; Controller representative patent attorney Takashi Honma

Claims (1)

[Claims] In a continuous heating device in which an object to be heated is conveyed through a plurality of heating sections arranged in series, a signal representing the conveyance distance of the object to be heated is obtained from the conveyance device that conveys the object to be heated, and this signal is used to determine the conveyance distance. Set temperature of the corresponding part 1! t-
Continuous heating device with automatic temperature setting device.