JPH0559973B2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a method of charging raw materials to a sintering machine,
In particular, the present invention relates to a method of charging raw materials onto a pallet with the lower end of the deflector plate floating above the surface of the raw material layer, in which the height of the loaded raw material layer does not fluctuate.

Conventional technology In order to continuously produce high-quality sintered ore, it is necessary to keep the bed height of the raw material charged into the sintering machine constant in the width direction and machine length direction, and to keep the charging density and raw material segregation constant. extremely important. Conventionally, the main charging method for keeping the layer height of raw materials constant was to bring the lower end of the deflector plate into contact with the raw material, and as the pallet moved, the surface layer of the charged raw materials was cut at the lower end of the deflector plate, making the surface smooth. However, when using this method, a heap of raw material is created near the bottom edge of the deflector plate,
Good particle size segregation of the raw material in the direction of bed height was inhibited, and the charging density increased, resulting in heavy charging, which was an obstacle to improving the quality of sintered ore. Therefore, in recent years, a method has been adopted in which raw materials are charged with the lower end of the deflector plate floating above the surface of the raw material layer, but this method allows for good raw material particle size segregation in the layer height direction, making it suitable for light charging. On the deflector plate of Narumono, raw materials tinged with water due to water sprinkling during the previous process of granulating raw materials tend to stick locally, so the flow of raw materials is easily blocked or changed, and as a result, the raw material layer The drawback was that the height was disturbed and the operation became unstable.
To deal with this problem, a plurality of detection mechanisms are installed in parallel to detect the layer height of the raw material charged in the width direction of the sintering machine. A plurality of charging amount control mechanisms are provided in parallel in the width direction corresponding to the detection mechanisms, and the detection mechanisms detect the raw material layer height dividedly in the width direction, and each detection signal and the averaged detection signal are used to determine the charging amount. There is also a device that operates the charging amount control mechanism so that the bed height of each part in the width direction and the average bed height are maintained at set values.
No. 36579). According to this method, it is possible to control the layer height in the width direction to be constant to some extent. In other words, even if a certain amount of material adheres to the deflector plate, the bed height can be maintained at the set value by the charging amount control mechanism, but there is a limit to the control amount of the charging amount control mechanism, Control accuracy tends to decrease as the amount increases.

Problems to be Solved by the Invention This invention provides a method for charging raw materials with the deflector plate floating above the surface of the raw material layer, in which the plate surface of the deflector plate is cleaned based on the detected value of the height of the raw material layer. The purpose is to remove the raw material adhering to the surface, control the height of the raw material layer to a constant level, stabilize the operation, and improve and stabilize the quality of the sintered ore.

Means to Solve the Problem That is, the present invention provides a plurality of detection mechanisms for detecting the raw material layer height in the width direction of the sintering machine in parallel, and also provides a plate cleaner for removing the raw material adhering to the deflector plate. The material bed height in the width direction is detected and the signal is sent to the control mechanism, and the plate cleaner is reciprocated on the deflector plate based on the difference between the detected value and the preset bed height setting, and the plate cleaner is moved back and forth on the deflector plate. It is designed to remove adhering raw materials.

Here, a plurality of plate cleaners are provided in parallel corresponding to each detection mechanism, and each is configured to be operated individually by a control mechanism according to the detected value from each detection mechanism, so that a predetermined amount or more of the raw material adheres to the plate cleaner. It is possible to operate only the plate cleaner on the attached part, or to operate all the plate cleaners at the same time.Also, a deflector plate with the same width as the deflector plate can be provided as a single unit to prevent the attachment of the entire plate surface. The raw material may be removed in one operation.

Although the method of the present invention may be used alone, it is preferably used in combination with a method of controlling the charge amount using the above-mentioned charge amount control mechanism.

Embodiments Hereinafter, embodiments in which the charging amount is controlled by a charging amount control mechanism will be described with reference to the drawings.

Figure 1 shows the raw material charging section and its control system, with fine adjustment gates 2 in the raw material cutting section at the bottom of the raw material hopper 1, and fine adjustment gates 2 in front of the cut-off plate 3 corresponding to each gate 2. A plurality of sound wave level meters 4 are provided in parallel in the width direction, and are connected to an air cylinder (not shown) on the upper plate surface of the deflector plate 5, and the plate reciprocates along the plate surface by the cylinder. A cleaner 6 is provided. 7 is a roll feeder, and 8 is a guide plate.

Regarding the control system, the layer height of the raw material 9 cut out onto the sintering machine is detected at multiple points in the width direction by each ultrasonic level meter 4, and each detected value is transmitted to the transducer 10.
The signals are then input to a plurality of indicating controllers 11 provided corresponding to each fine adjustment gate 2. Each indicator adjustment meter 11 has a set value incorporated in advance, and when a deviation occurs between the set value and the detected value, the signal is sent to the drive device of the fine adjustment gate 2 via the relay board 12. The air motor 13 is operated to open and close the fine adjustment gate 2, and by changing the amount of raw material cut out for each gate, the bed height at the detection point is always at the set value. This maintains the layer height in the width direction constant.

Each detected value input to the indicating controller 11 is also averaged by the main controller 14, and if the average value has a deviation from the set value pre-installed in the main controller 14, a signal is sent from the main controller 14. is roll feeder 7
The raw material is fed to the feeder, and the rotational speed of the roll feeder is changed to change the amount of raw material cut out and maintain a constant bed height in the longitudinal direction. However, the disturbance in the height of the raw material layer charged into the sintering machine can be corrected by opening and closing the fine adjustment gate using an ultrasonic level meter and automatically controlling the rotation speed of the roll feeder. There is a limit, and it may not be possible to deal with disturbances in the layer height in the width direction by controlling the fine adjustment gate alone. In this case, the main controller 14 detects the variation in layer height in the width direction, and when the variation exceeds the set value, a signal is sent to the solenoid valve of the air cylinder (not shown) to activate the plate cleaner 6. Move back and forth. This cleans the entire surface of the deflector plate, removes adhesion of the raw material, and stabilizes the charging state of the raw material.

The above is an example in which the plate cleaner 6 operates when the variation in the width direction of the layer height caused by local adhesion of raw materials on the deflector plate reaches a set value or more. Even if the variation in the width direction of the material adhering to the flexor plate is less than the set value, if the amount of adhesion increases and a deviation from the set value in the length direction occurs, the rotation speed of the roll feeder should be adjusted as described above. Instead of changing the amount of raw material to be cut out, or in addition to changing the amount of raw material to be cut out, a plate cleaner may be operated to remove the raw material adhering to the deflector plate.

Figures 2 and 3 show a part of a chart recording the temporal change in layer height in the width direction when the method shown in the above example is carried out, and Figure 2 shows the indicator layer of each indicator controller. Figure 3 shows the average layer height using the layer high value indicated by the main controller. In the figure, where the charging condition is good, the opening and closing of the fine adjustment gate and the rotational speed of the roll feeder are automatically controlled to maintain the bed height near the set value. Eventually, the raw material adheres to the surface of the deflector plate, and when the variation in layer height gradually increases and reaches a set value or higher, the cleaner is activated, and the plate surface of the deflector plate is cleaned, and the raw material that adheres to that surface is removed all at once. be dropped. As a result, the bed height rises instantaneously, and this is detected and the roll feeder lowers the rotation speed, which in turn lowers the bed height and causes temporary disturbance, but after recovery by automatic control, it is better than before the plate cleaner was activated. The layer height is stable with little variation.

Effects of the Invention As described above, the present invention provides a method for charging raw materials with the deflector plate floating above the surface of the raw material layer, in which the plate surface of the deflector plate is cleaned based on the detected value of the raw material layer height. The raw material adhering to this surface is removed, thereby eliminating disturbances in the raw material layer height, and by stabilizing the raw material layer height, the operation becomes stable.
Charging is stable even when the deflector plate is raised above the surface of the raw material, so good grain size segregation in the layer height direction is obtained, and the charging is light, making it possible to shorten firing time and improve quality. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the raw material charging section, and FIGS. 2 and 3 are chart diagrams recording changes in bed height over time. 1... Raw material hopper, 2... Fine adjustment gate, 3
...Cut-off plate, 4...Ultrasonic level meter, 5...Deflector plate, 6...Plate cleaner, 7...Roll feeder, 9...
...Raw material, 11...Indicating controller, 14...Main controller.

Claims (1)

[Claims] 1. In a method of charging raw materials into a sintering machine with a deflector plate floating above the surface of the raw material layer, a plurality of detection mechanisms for detecting the height of the raw material layer are arranged in parallel in the width direction of the sintering machine, and the deflector plate A plate cleaner is installed to remove the adhering raw material, and each detection mechanism detects the raw material layer height in the width direction and sends the signal to the control mechanism. A method for charging raw materials for sintering, characterized in that a cleaner is moved back and forth on a deflector plate to remove raw materials adhering to the plate.