JPS60152608A - Method for controlling tilt angle of rotary chute of bell-less charger - Google Patents

Abstract

PURPOSE:To improve the safety and efficiency of the operation of a blast furnace by measuring the actual angle of a rotary chute and the set angle of a tilting device when the chute is set in the furnace and by correcting the set angle by making use of the difference so as to eliminate the difference when the chute is tilted. CONSTITUTION:When a rotary chute 3 is set in a blast furnace, the set angle of a tilting device and the actual angle of the chute 3 are measured, and the set angle is corrected by making use of the difference so as to eliminate the difference (e.g., 1 deg.) between the actual angle of the chute 3 and the set angle of the tilting mechanism 9 due to a gap in a part connecting the body of the chute 3 to the mechanism 9 when the shoot 3 is tilted. Thus, a burden is charged into an exact position in the furnace, so the operation is stabilized, and the efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Different Fields of Application The present invention relates to a tilting system for tilting an r-circular rotating chute in a bellless charging device, which is one of the top charging devices having the function of distributing and supplying raw materials to a shoulder furnace. This invention relates to an angle control method.

BACKGROUND OF THE INVENTION As a blast furnace top charging device, a JJII bellless charging device, which has a rotating chute inside a blast furnace, has been put into practical use. This bellless charging device is a special public Sho 4B-3
As shown in Japanese Patent No. 4082, it has a hopper 2.2 arranged in parallel at the upper part of the blast furnace 1, a vertical chute 6, and a rotating chute 3 inside the furnace, as shown in Fig. 1, and the raw material is transferred from the hopper to the vertical chute. It is then distributed into the furnace via a rotating chute.

The rotating chute 3 has a rotating function, and at the same time has a tilting function in order to provide a uniform distribution of raw materials.In order to increase the operating efficiency of the blast furnace, it has an optimal tilting angle according to the operation at the time. By setting, raw material can be charged to the desired position.

A part of the connection between the chute body and the tilting mechanism of the tilting mechanism of the swinging chute 3 is shown in FIGS. 2 and 3.

The raw material discharged from the hopper falls onto the rotating chute 3, slides down, and is then charged into the blast furnace, causing the surface of the chute 3 to wear out. Therefore, if the limit is reached, replace it. In this type of blast furnace, since the chute is located inside the furnace, the structure is such that replacement work, that is, removal and installation work of the chute body is easy.

That is, the chute 3 does not have a structure in which it is held between the pin 12 and the block 16 containing the pin. When removing it, the two pins 12 on both sides are removed and the swing chute 3 is removed from the block 16 by lowering it downward. And to make it easier to remove, block J
6 and the part 11 in contact with the rotating chute 3. ,IIA,
IIB has a tapered structure. When installing, set the rotating chute 3 to the purple block 16 by raising the rotating chute 3 from the bottom to the top, and then attach the rotating chute 3 to the purple block 16.
and then insert the pin 12i into the turning chute 3.

Here, the tilting mechanism of the rotating chute will be described.

As shown in FIG. 2, power is transmitted from the motor 7 by the car mechanism 3-, and the block 16 is rotated about the core 18 via the pinion 8 and the fan-shaped gear 9.

When the block 16 rotates, the swing chute 3 sandwiched between the block 16 and the pin 12 simultaneously tilts around the core IB.

However, the conventional structure described above has drawbacks as described below.

That is, the part 1 where the block 16 and the rotating chute 3 are in contact
1A and IIB, it is inevitable that there will be a slight gap during manufacturing, and there is a mechanical tolerance (gap) between the pin 12 and block 16 so that the pin can be easily inserted and removed.
It is profitable. Due to these two gaps, a shift occurs between the tilting rotating chute 3 and the fan-shaped gear 9.

That is, in FIG. 3, when the core 19 of the swing chute 3 is on the right of the vertical line 17, the moment of the chute 3 is generated clockwise, so the swing chute 3 and the block 16 are located at the lower end of IIB and the upper end 4- of llA. The lower end of IIA and the upper end of IIB will be in contact with each other, and the above-mentioned gap will be created. On the other hand, if the center of gravity 19 is to the left of the vertical line 17, the moment of the chute 3 will occur counterclockwise, so the chute 3 and the block 16 will touch at the lower end of IIA and the upper end of IIB, and a gap will be created between the lower end of 11B and the upper end of 11A. become.

Therefore, a tilt angle difference occurs between the chute 3 body and the gear 9. This deviation is about 10 in angle in an actual machine, and the set tilt angle and the actual chute angle deviate by about 10, which causes a big problem in operation.

Figure 4 shows the situation. Angle 3 where the center of gravity is on the vertical line
There is a large deviation between the set value and the measured value from 30.5° to 32.5° compared to 1.5°.

Moreover, this deviation is caused by the furnace top charging device disclosed in Japanese Patent Application Laid-Open No. 56-8''613, that is, the furnace core is placed at the bottom of the hoppers 2A and 2B, which are installed at the same distance as the furnace core, as shown in FIG. In a bellless charging device equipped with a variable opening/closing mechanism 4 that can change the opening area in a circular or polygonal shape at the center, this problem is particularly serious because raw materials can be charged into the furnace evenly in the circumferential direction. becomes.

OBJECTS OF THE INVENTION The present invention has been made to improve these drawbacks.

Structure and Function of the Invention The present invention measures the set value of the tilting device and the actual angle of the swing chute when installing the swing chute 3, and corrects deviations based on the characteristics thereof. The method will be explained with reference to FIG.

When installing the swing chute, the actual angles measured at multiple points and (set value - actual measured value) are plotted, and the measured values are approximated and complemented by a straight line with constant values on both sides.

The more measurement points the better, but 10 to 20
It is possible to sufficiently correct the point. It is also effective to closely measure the area around the point (31, 5) where the center of gravity of the rotating chute just goes around the vertical line, and to roughly measure the rest.

Now, in Figure 4 plotted by measurement, 31.5
° is the point where the center of gravity of the shoot is exactly on the vertical line, and it can be seen that a sudden deviation occurs from 30.5° to 32.5° around this point.

Therefore, based on FIG. 4, the set angle is corrected as follows.

For example, if you want to operate at a real angle of 30°, the solid line (
Since the set value - actual measured value) is -0.65°, the set angle is controlled to be 29.35°. This can be easily accomplished by using a controller such as a sequencer. Furthermore, in this method, as the chute is used for a long period of time, the single center changes due to wear of the rotating chute. In other words, the position where a large deviation occurs will change. If this is reduced to the first condition and the deviation is corrected in the same way as with a new chute, the deviation will be exacerbated and there will be a big problem.

To solve this problem, the position of the center of gravity of the chute is continuously detected.For example, the solid line in Figure 4 is currently 31.5 degrees, which is the angle where the center of gravity coincides with the vertical line, but this has changed to 35 degrees. In this case, it is necessary to perform parallel movement as indicated by the broken line in the same figure to make the correct correction. The angle at which the center of gravity of the rotating chute is placed on the vertical line can be detected by continuously measuring the current value of the motor 7, since the direction of the moment changes at that point and the load changes.

Effects of the Present Invention With the present invention, it is possible to completely correct the deviation that occurs between the measured angle of the chute body and the set angle of the chute tilting mechanism in a bellless charging device, making it possible to charge the charge to the intended location in the blast furnace. This makes it possible to stabilize blast furnace operation,
This will greatly contribute to improving efficiency.

Furthermore, as shown in Fig. 6, a bellless charging device is provided with a variable opening/closing mechanism that can change the opening area in a circular or polygonal shape centering on the r-core at the bottom of the hopper installed in the same window as the hearth core. This has a particularly great effect because raw materials can be charged into the furnace evenly in the circumferential direction.

Embodiment FIG. 5 shows an embodiment of the present invention. In the conventional method, there was a large deviation of about 0.9° between the set angle and the measured angle, as shown by the solid line in FIG. When corrected by , it became possible to control the deviation to within ±0.1° as shown in FIG.

[Brief explanation of the drawing]

Figure 1 is an overall elevational view of the bellless charging device, Figure 2 is a cross-sectional view explaining the tilting mechanism of the rotating chute, Figure 3 is a side view showing the connection part of the rotating chute, and Figure 4 is the actual measured angle. A diagram illustrating the deviation from the set angle and its correction, FIG. 5 is a diagram showing the relationship between the measured angle and the angle after correction, showing an example of the present invention, and FIG. FIG. 1 is a cross-sectional view illustrating a desirable blast furnace top charging device. l... Blast furnace 3... Rotating/neat 7... Motor 11A, IIB... Connection part 12... Bin 16... Block applicant Nippon Steel Corporation Figure 1 Figure 4 39th I ("Figure 6 to 20 30 40 50 actual measurement +11C") -Cζ-

Claims (1)

[Scope of Claims] l) To correct the deviation between the actual chute angle and the set angle of the tilting mechanism caused by a gap between the chute body and the tilting mechanism when the in-furnace rotating chute of the bellless charging device a is tilted. The method for controlling the tilting angle of a rotating chute of a perless charging device, characterized in that the set angle v is corrected using the deviation characteristic between the actual angle and the set angle measured at the time of installing the chute. 2) To correct the deviation between the angle of the chute and the set angle of the tilting mechanism caused by the gap between the chute body and the tilting mechanism when the in-furnace rotating chute of the bellless charging device a is tilted. This bellless device corrects the set angle by using the deviation characteristics between the actual angle and the set angle measured when installing the chute, which are corrected using information obtained by measuring and detecting the center of gravity position of the chute after operation. A method for controlling the tilting angle of the rotating chute of the input device. 3) A method for controlling a tilting angle of a rotating chute in a bellless charging device according to claim 2, wherein the position of the center of gravity of the chute is detected by continuously measuring the load current of a chute tilting motor.