JPH0660332B2 - Tilting speed control method in automatic tilting gutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a hot metal discharged from a blast furnace, which is a tilting gutter arranged between a hot metal gutter and a mixed hot metal car or a ladle. Alternatively, the present invention relates to a tilting speed control method for switching tilting gutters when pouring into a ladle.

[Prior Art] As its outline is shown in FIG. 1, hot metal from a blast furnace is guided to a hot metal gutter 1 and discharged to reach a tilting gutter 2.
Empty mixed piggy wheels 4 and 5 are arranged below the left and right ends of the slant gutter 2. For example, the slant gutter 2 is tilted and the molten pig iron 3 is poured into the mixed piggy wheel 4 on the right side in the drawing.

When the tilting gutter 2 is tilted to the empty mixed piggy car 5 side which is arranged on the opposite side after the fixed amount hot metal 3 is injected into the mixed piggy car 4,
Since the tapping rate varies in the early, middle, and late stages of tapping of the blast furnace, the amount of pig iron stored in the tilting trough 2 at the time of switching tilting of the tilting trough 2 is not constant. Therefore, the drop trajectory drawn by the hot metal flowing down to the empty mixed piggy wheel 5 in the process of tilting in the opposite direction at a certain tilt angle is not constant. In some cases, at the time of switching tilt, there is a risk that the molten pig iron 3 stored in the tilt pouring gutter 2 may leak due to shaking or shaking back that occurs with the tilting operation, which is extremely unstable in operation and is outside the mixed piggy car 5. There is a risk of damage to the mixed pig iron 5, the track, and the like due to the molten pig metal 3 that has scattered around.

As a device for making the trajectory of the above-mentioned molten pig iron drop constant, for example, Japanese Utility Model Publication No. 58-18595 is known. This is to ensure that the hot metal is injected into the mixed piggy car by providing walls at both ends of the inclined pouring gutter and forming a funnel-shaped pouring outlet on the upstream side of this wall.

[Problems to be Solved by the Invention] However, according to the method disclosed in Japanese Utility Model Publication No. 56-18595, the tip of the tilting gutter is covered with the receiving port of the mixed pig truck. That is, the visibility of the piggyhole of the towed car is deteriorated. Therefore, it becomes impossible to install a measuring and monitoring device (not shown) for the amount of hot metal received by the hot metal, for example, a microwave type hot metal level monitoring device and a television monitoring device. Further, by making the tilting gutter pouring opening into a funnel shape, there is an inconvenience that the repair of the funnel-shaped extraction opening becomes complicated.

The present invention relates to a tilting gutter provided with a general outlet, a so-called tilting gutter, which has overflow outlets on both sides, and is not a mode in which the entire surface of the socket of the mixed piggy wheel is not covered. That is, the swinging or swinging back of the hot metal in the inclined pouring trough is suppressed, and moreover, the falling trajectory of the hot metal in the direction in which the tilting is switched is made substantially constant so as to flow down.

[Means for Solving the Problems] In the tilting speed control during tilting switching and tilting of the tilting trough, the present invention sets the tilting trough to a horizontal state at the tilting angular velocity calculated from the pig iron speed during tilting switching and tilting. A tilting speed control method at the time of automatic tilting of the tilting trough, wherein the tilting trough is tilted at each tilting speed calculated from the amount of pig iron stored in the tilting trough and the speed of receiving iron.

[Operation] Hereinafter, the present invention will be specifically described based on the embodiments shown in the drawings.

As shown in FIG. 1, the hot metal from the blast furnace is guided through the hot metal gutter 1 to the inclined gutter 2 and flows out.

Empty mixed piggy wheels 4 and 5 are arranged below the left and right ends of the slant gutter 2. For example, the slant gutter 2 is tilted and the molten pig iron 3 is injected to the right side mixed piggy wheel 4 side in the drawing. Hot metal weight scales 6 and 7 are arranged below the tow metal wheels 4 and 5, respectively, to measure the amount of hot metal received by the hot metal car 4, and the velocity of hot metal passing through the tilting trough 2 is calculated.

When the tilting trough 2 is tilted in order to inject the hot metal to the left hot metal wheel 5 in the figure after the hot metal 3 to be poured into the hot metal wheel 4 reaches a certain amount, the drop of the hot metal flowing out from the tip of the tilting trough 2 is dropped. The locus is mainly determined by the amount of pig iron stored in the tilting gutter 2 (remaining amount of pig iron) and the tilting angular velocity.

In the switching tilting operation of the tilting gutter 2, the tilting gutter 2 tilted in one direction is first brought into a horizontal state and then tilted in the other (reverse) direction. The amount of hot metal flowing in from the hot metal gutter 1 in the switching tilting operation time of the tilting gutter 2 depends on the tapping situation at that time, and varies depending on which timing in the tapping time.

Therefore, as shown in FIG. 2, first, while the tilting gutter 2 tilting in one direction is tilted in a horizontal state, the amount of hot metal 3 supplied to the tilting gutter 2 does not exceed a certain amount. like,
The calculator 10 calculates from the pig iron amount speed 12, and the calculator 10 outputs the tilting angular velocity to the actuator 8 until the indicated value of the tilting angle detector 9 becomes horizontal, and tilts the tilting trough 2.

As shown by the angular velocity lines 13, 14, and 15 in FIG. 3, the tilting angular velocity is calculated and instructed by the capacity determined by the pig iron receiving velocity 12 and the shape characteristic of the tilting trough 2.

The tilting control is performed based on the calculated tilting angular velocity, and the amount of pig iron stored in the tilting gutter 2 during the time when the tilting gutter 2 is in a substantially horizontal state is, for example, about 7 to 8 of the maximum stored pig iron storage amount. The tilting gutter 2
The swaying or unswaying that occurs with the tilting of the hot metal inside is minimized, and the hot metal outflow to the hot metal mixing piggy car 4 is stopped,
The tilting gutter 2 becomes horizontal.

Next, when tilting from the horizontal state to the side of the empty hot metal car 5, the hot metal drop locus should be located almost at the center of the hot metal port of the hot metal car 5.
The calculator 10 calculates from the amount of accumulated pig iron (remaining amount of pig iron) in the tilting trough 2 and the speed 12 of the subsequently received pig iron, and the calculator 10 outputs the tilting angular velocity to the actuator 8 to tilt the tilting trough 2. To do.

[Advantages of the Invention] As described above, when the tilting gutter 2 is tilted, the tilting is manually performed by a skilled operator so that the hot metal does not scatter by visual observation. Since the tilting control is performed based on the tilting angular velocity calculated from the leaning speed of the tilting gutter 2, skilled workers and constant monitoring work are not required, and the hot metal 3 flowing out from the hot metal gutter 2 is safely and reliably mixed with the mixing piggy car 4, 5
The hot metal can be automatically injected into the hot metal container such as.

Moreover, it is not necessary to change the mechanical structure of the tilting trough 2 only by providing the tilting trough angular velocity calculation system, the structure is extremely simple, and there is no need to monitor the trough at the time of automatic switching of the tilting trough, and maintenance and inspection is easy. The economic effect is great, such as being able to do it.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an outline of an example of a blast furnace injection facility,
The figure is a tilting gutter tilting control block diagram, and FIG. 3 is a graph showing a model relationship between the tilting angle and the tilting angular velocity when the gutter receiving pig iron amount changes. 1 ... hot metal gutter, 2 ... tilting gutter 3 ... hot metal, 4 ... receiving hot metal mixed car 5 ... standby hot metal car, 6,7 ... hot metal weigh scale 8 ... swivel tilting actuator 9 ... tilting angle detector, 10 ... tilting Speed calculator 11 ... Tilting command, 12 ... Pilot receiving speed 13, 14, 15 ... Tilt injecting angular velocity command 16 ... Set tilt injecting angular velocity command

Claims (1)

[Claims] 1. In tilting speed control at the time of switching of the tilting trough, the tilting trough is brought into a horizontal state at a tilting angular velocity calculated from the tilting speed at the time of tilting switching and tilting, and then, the amount of stored pig iron and the piggyback of the tilting trough. A tilting speed control method for automatic tilting of a tilting gutter, which comprises tilting the tilting gutter at a tilting angular velocity calculated from the velocity.