JPH0658677A - Sintering raw material charging method - Google Patents

Abstract

PURPOSE:To provide a raw material charging method which stabilizes charging and improves quality of a sintered ore by suppressing a subgate stop period to a minimum limit when a raw material is charged to a sintering machine. CONSTITUTION:In a sintering raw material charging method, a pouring amount 15 on the raw material slope of a sintering raw material 20 charged on a pallet 16 by the use of a chute 4 is detected by a non-contact type sensor 13. The opening of a subgate 3 is regulated so that a detected value therefrom is adjusted to a target value and charging is carried out as the surface of the chute 4 is cleaned by a cleaner 8. The detecting surface of the non-contact type sensor 13 is purged by means of air at a timing at which the cleaner 8 is started, and during a period in which purging is executed, the regulation of the opening of the subgate 13 is stopped. This method increases a control executing period of a proper pouring amount 15, and improves a yield and quality, such as a cold strength, of a sintering ore through stabilization of charging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintering raw material charging method for charging a sintering raw material onto a pallet in a sintering machine.

[0002]

2. Description of the Related Art In a sintering machine, when a sintering raw material (hereinafter referred to as a raw material) is charged on a pallet, the thickness of the raw material after the charging is adjusted to a stable target value. Then, the unevenness of the surface of the raw material should be reduced, and the surface layer density and grain size should be adjusted so as not to be uneven, and the surface layer density should be adjusted within an appropriate range. It is important to improve the quality of the product and improve the air permeability when firing the raw material.

As a raw material charging method in this sintering machine, for example, the method is proposed in Japanese Patent Application Laid-Open No. 2-77531.

In the method disclosed in Japanese Patent Laid-Open No. 2-77531, the ultrasonic sensor detects the amount of the raw material loaded on the pallet on the inclined surface of the raw material to adjust the speed of the pallet and the supply amount of the raw material. Is the way to do it.

In this method, the amount of swelling is detected by a non-contact type sensor, and various operating conditions relating to charging are adjusted so that the detected amount of swelling reaches a target value.

Next, in order to stabilize the charging, it is important to maintain a state in which no raw material is attached to each chute of the charging device. Therefore, as a method of cleaning the surface of each chute of the charging device, techniques such as Japanese Patent Laid-Open No. 1-159331 and Japanese Utility Model Laid-Open No. 64-35397 have been proposed.

[0007] In all of these methods, the surface of each chute on which the raw material is adhered is cleaned by moving the scraping plate in the pallet width direction or in the vertical direction. This is an essential function.

[0008]

However, when the scraping plate moves on the surface of each chute, the detection of the charging amount of the charging portion is greatly disturbed.

FIG. 5 shows a charging control method in a conventional sloping chute type charging device, and FIG. 6 shows a charging control method in a slit bar type charging device.

In any of the above-mentioned charging devices, the sintering raw material 20 passes from the charging hopper 1 through the sub-gate 3, and is charged onto the pallet 16 via the chutes 4, 4A, 7, the slit bar 6 and the deflector chute 9. To be done.

In the sloping chute type charging device shown in FIG. 5, the raw material adhering to the surface of the chute 4 is periodically and automatically cleaned by the traverse cleaner 8 moving in the pallet width direction. .

On the other hand, in the slit bar type charging device shown in FIG. 6, the surface of the chute 7 has a traverse cleaner 8
The surfaces of the chute 4A and the deflector chute 9 are periodically and automatically cleaned by the upper cutter 5 and the lower cutter 10 moving in the vertical direction. (Hereinafter, the traverse cleaner 8, the upper cutter 5, and the lower cutter 10 are collectively referred to as a cleaner)

Here, when cleaning the surface of each chute with a cleaner, the raw materials adhering to the surface of each chute are scraped off at once. Therefore, the amount of the sintering raw material charged into the pallet 16 was temporarily increased, and the detected value of the amount of swelling 15 was higher than the target value.

Then, in the next stage, a temporary boil amount 1
The increase amount of 5 is detected by the ultrasonic sensor 13 for detecting the amount of swelling, and the opening amount of the subgate 3 is adjusted so as to decrease the amount of swelling 15, so that the amount of swelling 15 is opposite to the target value. There was a phenomenon that it became low.

As described above, the activation of each cleaner is a large disturbance for stable charging control, particularly in the charging control method for detecting the amount of swelling 15 and adjusting the opening of the subgate 3. It was.

Therefore, in order to remove the disturbance to the detected value of the blistering amount 15 due to the activation of these cleaners, a method of stopping the adjustment of the opening degree of the sub-gate 3 at the timing of activation of each cleaner is implemented.

However, stopping the adjustment of the opening degree of the sub-gate 3 at the time of starting the cleaner in order to simply remove the disturbance to the detected value of the blistering amount 15 due to the start of the cleaner is short in the control execution period. Because,
It must be said that it is disadvantageous in maintaining stable charging control.

Further, the charging part of the sintering machine is very difficult to use the non-contact type sensor due to the dropping of the raw material from the drum feeder 2 and the generation of steam due to the hydration reaction of the quick lime contained in the sintering raw material. Environmentally inferior to

For example, in the ultrasonic sensor 13 for detecting the amount of swelling as shown in FIG. 5 and FIG. 6, fine powder of the raw material adheres to the detection surface due to dust, steam, etc. in the surroundings and is detected. Was often disabled.

In order to deal with this, conventionally, a method of periodically purging the detection surface of the non-contact type sensor has been adopted. This will be described with reference to FIGS. 5 and 6.
By periodically spraying air or the like from the purging nozzle 12 onto the detection surface of the swollen amount detection sensor 13, the detection power of the non-contact type sensor is maintained.

However, while the purging is being performed, the amount of swelling 15 cannot be detected and the adjustment of the opening of the sub-gate 3 is stopped. Therefore, it must be said that stopping the adjustment of the opening degree of the sub-gate 3 simply for performing the purge shortens the control execution period, which is disadvantageous in continuing stable charging control. Absent.

The present invention has been made in view of the above problems,
Provided is a sintering raw material charging method for stabilizing the raw material charging and improving the quality of the sintered ore by keeping the detection power of a non-contact type sensor to a minimum while keeping the subgate stop period.

[0023]

The gist of the present invention is to detect, by a non-contact type sensor, the amount of flapping of a sintering raw material charged on a pallet using a chute on a raw material inclined surface. In the sintering raw material charging method in which the sub-gate opening is adjusted so that the target value becomes the target value, and the chute surface is charged while cleaning with a cleaner, the detection surface of the non-contact sensor at the timing of starting the cleaner. Is purged with air, and the adjustment of the opening degree of the sub-gate is stopped during the purging period.

[0024]

In this way, the detection surface of the non-contact type sensor is purged with air at the timing of activating the cleaner, and the adjustment of the opening degree of the sub-gate is stopped during the purging, so that the non-contact amount is detected. It is possible to maintain the detection power of the contact type sensor reliably and to detect the change in the amount of swelling caused by the original change in operation while minimizing the period during which the adjustment of the sub-gate opening is stopped. To do.

[0025]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows an example of raw material charging by a sloping chute type charging device, and FIG. 2 shows an example by a slit bar type charging device.

In the sloping chute type charging device shown in FIG. 1, the raw material 20 cut out from the drum feeder 2 is charged into the pallet 16 via the chute 4. In this embodiment, as a cleaner for the chute 4,
A traverse cleaner 8 is used, and the traverse cleaner 8 moves in the pallet width direction to scrape off the raw material adhering to the chute 4.

Then, the activation signal of the traverse cleaner 8 is taken into the control device 14, and at the timing when the traverse cleaner 8 is activated, the control device 14 issues an opening command of the purge nozzle 12 to the solenoid valve 11.

On the contrary, when the purging nozzle 12 is closed and the traverse cleaner 8 is stopped, the amount of swelling 15 detected by the ultrasonic sensor 13 for detecting the amount of swelling makes the amount of swelling 15 a target value. As described above, the opening of the sub-gate 3 is adjusted and normal charging control is performed.

In the slit bar type charging device shown in FIG.
As a cleaner for the chute 4A and the deflector chute 9, an upper cutter 5 and a lower cutter 10 that scrape off adhering raw materials by moving in the vertical direction are installed. The same traverse cleaner 8 as the chute method is installed.

The upper cutter 5 and the lower cutter 1
0, the activation signal of the traverse cleaner 8 is taken into the control device 14, and at the timing when each cleaner is activated,
The controller 14 issues a command to the solenoid valve 11 to open the purge nozzle 12.

On the contrary, when the purge nozzle 12 is closed and each cleaner is stopped, the amount of swelling detected by the ultrasonic sensor 13 for detecting the amount of swelling makes the amount of swelling a target value. The opening of the sub gate 3 is adjusted to perform normal charging control.

FIG. 3 shows a state in which the slit bar type charging device shown in FIG. 2 is viewed from above. The sub-gate 3 is divided into seven parts in the pallet width direction. An ultrasonic sensor 13 for detecting the amount of swelling is installed for each sub-gate 3, and a purge nozzle for purging the detection surface of the ultrasonic sensor 13 for detecting the swelling amount. 12 and a solenoid valve 11 are installed.

Next, the starting timing of the upper cutter 5 and the lower cutter 10 and the flow of the time-series operation of the solenoid valve 11 according to the present invention will be described with reference to FIG.

First, when the upper cutter 5 is activated, the control device timer 17 provided in the control device 14 is synchronized with this.
Is activated, the solenoid valve 11 is opened, and the purging is started with the control device subgate control lock 18 turned ON.

Next, when the control device timer 17 reaches the state of L ₀ , the solenoid valve 11 is closed and the purging is completed. When the control device timer 17 which is completely purged is in the Hi state, the control device sub-gate control lock is performed. 18 is released and the controller timer 17 also returns to the initial state. Hereinafter, even when the lower cutter 10 is activated, it operates similarly to the upper cutter 5.

In the embodiment, the ultrasonic sensor is used as the detecting end for detecting the amount of swelling, but it is also possible to use another non-contact sensor.

It is desirable to match the purge timing with the activation of all the cleaners from the viewpoint of maintaining the accuracy of the detection end. However, when a plurality of cleaners are activated at different timings, the charging control function operation is performed. The time is shortened, which is disadvantageous in terms of the basic purpose of stabilizing the charging.

Therefore, when there are plural cleaners,
Set the cleaner start cycle as long as the material adhesion allows, or adjust the cleaner start timing as much as possible, or set only the cleaner start timing that causes a large disturbance to the bounce amount as the detection end purge period. Adjustment is required.

[0040]

As described above, according to the present invention, the means for purging the detection surface of the non-contact sensor with air at the timing of activating the cleaner and stopping the adjustment of the opening of the sub-gate during the purging. By maintaining the detection power of the non-contact type sensor that detects the amount of burr, the change in the amount of burr that accompanies the original change in operation is detected, and the period during which the adjustment of the sub-gate opening is stopped It can be kept to a minimum.

As a result, an appropriate period for controlling the amount of swelling increases, and it becomes possible to improve the yield by stabilizing the charging and improve the quality of sinter such as cold strength.

[Brief description of drawings]

FIG. 1 is a side view illustrating an implementation of a charging control method according to the present invention in a charging device of a sloping chute system.

FIG. 2 is a side view illustrating the implementation of the charging control method according to the present invention in a slit bar charging device.

FIG. 3 is a perspective view of a charging unit from the upper side, which illustrates an implementation of the charging control method according to the present invention in the slit bar charging device.

FIG. 4 is a time chart diagram for explaining a time-series operation flow of the cleaner and the solenoid valve in the charging control method of the present invention.

FIG. 5 is a side view illustrating a conventional charging control method in a charging device of a sloping chute system.

FIG. 6 is a side view for explaining a conventional charging control method in the slit bar charging device.

[Explanation of symbols]

 1 Charging Hopper 2 Drum Feeder 3 Sub Gate 4, 4A Chute 5 Upper Cutter 6 Slit Bar 7 Chute 8 Traverse Cleaner 9 Deflector Chute 10 Lower Cutter 11 Solenoid Valve 12 Purge Nozzle 13 Ultrasonic Sensor 14 Folding amount 16 Pallet 17 Control device timer 18 Control device Subgate control lock 20 Sintering raw material

Front page continued (72) Inventor Yoshiyuki Shirakawa 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Kimitsu Works

Claims (1)

[Claims] 1. A sub-gate opening for detecting the amount of flapping of a sintering raw material loaded on a pallet on a sloping surface of a pallet using a chute with a non-contact type sensor so that the detected value reaches a target value. In addition to adjusting, in the sintering raw material charging method of charging while cleaning the surface of the chute with a cleaner, while purging the detection surface of the non-contact type sensor with air at the timing of starting the cleaner,
A method of charging a sintering raw material, characterized in that the adjustment of the opening of the sub-gate is stopped during the purging.