JPS6010093B2 - Operation control method for continuous heating furnaces such as rotary furnaces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the charging and extraction of steel materials in a continuous heating furnace such as a rotary furnace, which is used to heat steel materials such as round billets to an appropriate temperature in advance when rolling them. This invention relates to an operation control method such as floor rotation pitch control.

Each operation, such as bagging the steel material into the furnace, extraction to take it out from the furnace, and rotation of the hearth, has already been automated.However, the dimensions of the steel material, steel type, standard rolling pitch, etc. When the temperature changes, workers make necessary judgments and change the settings each time, and the timing of extraction is determined by workers taking into consideration the rolling pitch and steel temperature.However, with these methods, Because each worker had to change the settings one by one, it was inefficient and prone to mistakes.
In addition, the timing of extraction depends on the skill level of the worker, so it is not always carried out optimally. In view of the various drawbacks of the conventional method as described above, the present invention tracks the transition of steel material one by one in order to eliminate these problems, and constantly monitors the dimensions and material of the steel material to be processed, the rolling status of the rolling line, the steel material extraction temperature, etc. The purpose is to enable complete automation of the bagging and extraction of steel materials by making it possible to grasp the system accurately, and this will be explained in detail below with reference to a drawing showing one embodiment.

FIG. 1 is a schematic explanatory diagram showing the configuration of the entire apparatus when the present invention is used to control the operation of a rotary furnace.

In the figure, A is a rotary furnace, B is a furnace line for transporting steel materials to the entrance of the rotary furnace A, and C is a rolling line. Rotary furnace A
A bag filling machine 3 is installed at the entrance, and an extractor 10 is installed at the exit. In the figure, 5 and 13 are both sensors, one of which 5 detects the steel material carried by the furnace line B and the arrival of the charging machine 3, and the other 13 detects the steel material carried by the rolling line C. It is detected that the rolling mill 12 has finished rolling and has reached the outlet of the rolling mill 12. Further, numeral 9 in the figure is a hearth rotation pulse counter for detecting the rotation of the hearth. The control mechanism used in this embodiment is configured as follows.

In other words, 1 in the figure is a steel material information transmission circuit, which transmits steel material information such as diameter, length, material, number of steel products in a lot (number of steel products belonging to that lot), standard rolling pitch, etc. on a lot-by-lot basis through a communication circuit. It is sent to the creation storage circuit 2.
Note that the steel material information transmission circuit 1 may transmit the steel material information to one piece or all at once. The table creation memory circuit 2 stores a number of steel material information entry fields corresponding to or more than the number of steel materials that can exist in each region of the furnace line B to rotary furnace A and rolling line C. A table for the furnace, a table for the furnace area, and a table for the rolling area are each created and stored. The table 21 for the furnace front area shown in FIG.
20. Enter each steel information regarding...in the respective steel information entry column,
Each of the steel materials 11T, 1st trial 89, 1 turtle 9?120, etc. is arranged in accordance with the order in which they are actually sent onto the furnace front line B. When the sensor 5 detects that the steel material to be charged into the rotary furnace A has arrived in front of the charging machine 3, a signal b to that effect is sent to the calculation command circuit 4. Based on the arrangement order of each steel material information entered on the table 21, the steel material that has reached the charging position (in Fig. 1, the steel material 1
17), calculate the number of rods to be loaded this time based on the length information, and send the result to the sequencer 6.
instruct. However, if the steel material to be charged is the last one in the lot to which it belongs, regardless of its length,
A command is given to charge only one rod. The arithmetic command circuit 4 also uses information such as the diameter, length, material, and belonging lot of the steel material information retrieved as described above. In the case of a lot change, the forward position of the charging machine 3 is determined according to the diameter, length and material of the steel material to be charged this time.
(Position to place the steel material in the rotary furnace), retreat position (position when grasping the steel material), "charging side hearth rotation pitch ~ Charging interval in this case (the steel material that has already been charged and the steel material to be bagged next)" and the distance above the hearth) and command the results to sequencer 6 to change the charging operation settings.Sequencer 6
is the charging machine 3 based on the command sent from the calculation command circuit 4.
and a drive motor 7 for rotating the hearth. Next, as shown in FIG. 3a, the furnace area table 22 includes steel materials 102, colors Q3, 104,
The information of 105...116 is arranged and entered in each steel material information entry column according to the order in which the steel materials 102, 103, 1047, 106, and 106 are actually lined up.

If there are multiple pieces of steel at one charging position, information about the piece of steel closer to the center of rotation is placed in the front. In this case, the steel material information includes information such as the material, length, diameter, belonging lot, etc. mentioned above, as well as various information necessary for controlling the extractor 10 obtained after charging, such as the position in the furnace of each steel material and elapsed time. It is.
The in-furnace position is determined from the count of the hearth rotation pulse counter 9, and the elapsed time in the furnace is determined from the hearth rotation pitch. The hearth rotation pulse counter 9 sends its count as a signal c to the steel material information control circuit 8'. Signal a in FIG. 1 is a signal indicating that the charging machine 3 has charged the steel material as set, and is also sent to the steel material information control circuit.

When the steel material information control circuit 8 receives the signal a, it shifts each steel material information on the furnace zone table 22 forward by a column corresponding to the number of newly charged steel materials. Then, the information on the charged steel material that was on the furnace front area table 21 is transferred to the last part of the table. To illustrate this using the state shown in FIG. 1 as an example, if only i pieces of steel material 117 are charged, the furnace zone table 22 shown in FIG. 3a will become as shown in FIG. 3b. . On the other hand, when the extracted signal d is received from the extractor IQ, the steel material information control circuit 8 transfers the information of the corresponding steel material to the rolling zone table 23, which will be described later.
By doing the above ~ Table 22 for furnace area
"Information on the charged steel materials for the furnace front section table 28 is always arranged in accordance with the order of the steel materials actually lined up in the hearth. On the other hand, as described above, the information regarding the charged steel materials for the furnace front section table 28 is always arranged in accordance with the order of the steel materials actually lined up in the hearth. When shifted to 22, the information on each steel material on the tabletop 2 for the furnace front area is shifted forward by the number of columns corresponding to the number of inserted steel materials.

The result is, for example, as shown in FIG. 2b. It goes without saying that the information on the next steel material 121 sent from the steel material information transmission circuit 1 is entered in the column on the furnace front area table 21 where the information on the steel material 120 was entered. Next, when the extracted signal d from the extractor 10 is input to the arithmetic command circuit 4, the arithmetic command circuit 4 selects the next information to be extracted from each steel material information on the furnace area table 22. Information regarding the steel material (102 in the case of Figure 1)
The extraction side rotation pitch is calculated based on the elapsed time information in the furnace, etc., and the result is instructed to the sequencer 6.

In addition, the calculation command circuit 4 operates as described above for the in-furnace area tape.
Based on the belonging lot information in the information regarding the steel material to be extracted next time taken out from the bull 22, it is determined whether the steel material to be extracted next time is a lot change or not.If the steel material is to be extracted next time, the sequencer 6 The sequencer 6 instructs the forward position and hearth rotation distance of the extractor 10 and changes the settings.Based on the instructions sent from the calculation command circuit 4, the sequencer 6 controls the extractor 10 and the drive motor T for rotating the hearth. In a rotary furnace, the distance the hearth rotates based on the request from the charging side and the distance it rotates due to the request from the extraction side may differ due to lot changes, so in this case, first
・Rotate by the rotation distance of the smaller one, then rotate the remaining distance of the larger one.

-Next, the timing for extracting steel material from rotary furnace A is controlled as follows. That is, the calculation command circuit 4 determines the material of the steel material to be extracted on the furnace area table 22;
Heat transfer is calculated based on information such as dimensions, elapsed time in the furnace, etc., and temperature information from the furnace thermometer 11, etc., and the temperature of the steel material at the time of extraction is calculated to reach a preset temperature. Only if you have reached it by determining whether it is true or not,
An extraction start command is issued based on the extraction pitch calculated as follows. That is, in the table creation memory circuit 2, like the table 21 for the furnace area and the table 22 for the furnace area,
A rolling zone table 23 as shown in FIG. 4a is provided in which information on each steel material lqo, 101, etc. is arranged and entered in accordance with the order of the steel materials lined up on the rolling line C.

When a signal d indicating that steel material has been extracted from the extractor 10 is sent to the steel material information control circuit 8, the steel material information control circuit 8 receives information on the extracted steel material from the furnace area table 22. It is moved to the last part of the rolling zone table 23, and the information on each steel material that has already been written is shifted forward. As a result, the rolling zone table 23 becomes as shown in FIG. 4b. On the rolling area table 23, information on each steel material is arranged so as to match the order in which the currently existing steel materials are lined up, so the calculation command circuit 4 uses the detection signal e from the sensor 13 to The information on the steel material (steel material 100 in the case of FIG. 1) that has been processed is retrieved based on the arrangement order on the rolling zone table 23, and the standard rolling pitch planned for the steel material is known. A detection signal e is emitted from the sensor 13 each time the steel material is rolled. - Since the actual rolling pitch of the steel material can be determined based on the time measurement result, the extraction schedule is determined based on a comparison between the two. The extraction pitch of the steel material (the steel material 102 in the case of FIG. 1) is calculated as appropriate, and an extraction start command is issued to the sequencer 6 based on the result. Note that the table creation storage circuit 2, steel material information control circuit 8, and calculation command circuit 4 are incorporated into the process computer. According to the present invention, as described above, it becomes easy and reliable to recognize lot changes, eliminates the need for workers that were previously required, eliminates mistakes, and significantly improves work efficiency, among other effects. is obtained. Please note that the above is for rotary furnace operation control.
Although the case where the present invention is implemented is shown, the present invention can also be applied to the operation control of continuous heating furnaces other than rotary furnaces. In that case, it goes without saying that the control method may be modified as appropriate within the scope of the present invention.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram showing the entire rotary furnace apparatus implementing the present invention, Fig. 2 a and b are explanatory diagrams of the table for the furnace area before and after the shift command, and Figs. 3 a and b are before and after the shift command. FIGS. 4a and 4b are explanatory views of the table for the rolling area before and after the shift command is given. 1... Steel material information transmission circuit, 2... Table creation memory circuit, 3... Charging machine, 4...
Arithmetic command circuit, 5, 13...Sensor, 6...Sequencer, 7...Drive motor for hearth rotation, 8...Steel material information control circuit, 9...Heart rotation pulse counter , 10... Extracting machine " 12... Rolling machine, 2
1... Table for the furnace front area, 22... Table for the furnace area, 23... Table for the rolling area. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A table for the furnace area, a table for the furnace area, and a table for the furnace area each equipped with a number of steel material information entry columns corresponding to or more than the number of steel materials that can exist in each area of the furnace line, furnace line, and rolling line. Using a table creation memory circuit that creates and stores tables for each rolling zone, information on the steel materials currently existing in each zone is stored in the steel information entry column of each table in accordance with the order in which the steel materials are lined up, and at the same time By shifting the steel material information stored in each table each time the steel material is transferred between and within each zone, the position of the steel material that is sequentially transferred to each zone is tracked. A method for controlling the operation of a continuous heating furnace such as a rotary furnace, characterized by performing various controls necessary for the operation of the heating furnace, such as charging into the heating furnace, extraction control, or hearth rotation pitch control.