JPH07110193A - Grate bar drop detector for sintering furnace - Google Patents

Abstract

PURPOSE:To automatically accurately detect drop of a grate bar by imaging a light emitted to the bar, calculating a gap area of the bar by processing the image, deciding the drop of the bar when this calculated value exceeds a set value, and outputting an alarm. CONSTITUTION:A pallet 8 of a sintering furnace has a grate bar for placing sintering raw material to form an opening for sucking it, is reversed at a feeder side sprocket wheel 9 and conveyed. In this case, an upper surface of the pallet 8 is radiated with a laser light from a laser light source 1, and an emitted light is imaged by a linear sensor 2. The imaged video signal is transmitted to an arithmetic unit 4 through an image processor 3. Further, a detection signal of a pulse generator 6 arranged on a drive shaft of the wheel 9 is transmitted to the unit 4 through a position detector 7. The unit 4 calculates a gap area of the bar based on input signals and decides drop of the bar.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a great bar dropout detecting device for a sintering machine.

[0002]

2. Description of the Related Art A pallet of a sintering machine is equipped with a large number of great bars for mounting a sintering material and forming a large number of slit-shaped openings for sucking air downward through a sintering bed. This great bar may fall off due to high temperature oxidative wear or breakage after long-term use. When the great bar comes off, the surface on which the great bar is attached becomes perforated, the sintering raw material is sucked from there and holes are made in the sintering bed, and the air is concentrated and sucked, so the sintering yield decreases. . Such perforations must be found early and replenished to repair the Great Bar.

[0003] Hitherto, the great bar has been found to have been dropped by an operator who regularly inspects the great bar to be dropped on the sinter bed or at the pallet inversion section on the side of the sintering raw material supply. Since the method of finding by inspection by the operator is not always monitoring, the discovery rate is poor, and the operator is restrained for a long time.

There are the following techniques for the purpose of solving such problems. 1) The technique described in Japanese Patent Publication No. 51-23245 is a technique in which the suction airflow is continuously measured by an airflow meter installed in one of the wind boxes of a sintering machine, the average airflow is calculated, and suction is performed for this average airflow. The fall of the great bar is detected by the increase in the measured air flow rate exceeding the normal air flow rate fluctuation limit.

2) In the technique disclosed in Japanese Patent Laid-Open No. 268031/1992, the slit light radiated on the surface of the sintering bed is photographed by a television camera, and the image signal is analyzed to make holes on the surface of the sintering bed. The perforated length is obtained, and the drop of the great bar is detected when the perforated length exceeds the set value.

3) In the technique disclosed in Japanese Patent Laid-Open No. 4-276030, the distance between the great faces of the pallet at the ore feeding side reversing part of the sintering machine is measured by scanning in the pallet width direction with a level meter, When the measured value exceeds the set value and exceeds a certain range, the falling of the great bar is detected.

[0007]

However, the above-mentioned prior art has the following problems. That is, the method of detecting by installing an air flow meter in one of the wind boxes in 1) is
It is difficult to detect unless a large number of great bars fall out. Also, when perforation occurs in the wind box,
There is a problem that it cannot be distinguished whether it is due to the perforation of the wind box or the drop of the great bar.

In the method 2) of irradiating the surface of the sintered bed with slit light for detection, the difference is detected by the difference in brightness between the perforated portion and the normal portion. There is a problem in that is falsely detected as a hole.

The method of measuring the distance of the pallet great surface of the inverting side of the sintering machine on the feed side of the sintering machine by scanning in the pallet width direction with the level meter of 3) is a method in which the great bar is on the mounting surface due to vibration or other factors. When it moves at an angle to the pallet advancing direction, for example, a gap with the width dimension of the great bar occurs at the tip of the great bar, and at the rear end, when the gap is zero, it actually falls off. However, there is a problem that it is mistakenly detected as the drop of the Great Bar.

The present invention is intended to solve the above problems, and automatically removes a small number of great bars.
It is an object of the present invention to provide a detection device capable of detecting a breakage of a great bar as well as detecting with high accuracy and high reliability.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 irradiates a slit-shaped light in the width direction of the great bar of the pallet at the reversing part of the sintering machine, and its means. A detector for detecting irradiation light, an image processing means for image-processing an image signal from the detector, a position detecting means for the pallet, and a great bar for detecting the gap width of the great bar from the signal of the image processing means. A gap width detecting means, a great bar gap area calculating means for calculating a gap area of the great bar from a signal of the pallet position detecting means and an output of the great bar gap width detecting means, and when the calculated value exceeds a set value. It is characterized in that it is provided with an alarm means for issuing an alarm signal.

According to a second aspect of the present invention, means for irradiating slit-shaped light in the width direction of the pallet great bar at the inverting part of the sintering machine, a detector for detecting the irradiation light, and a detector for detecting the irradiation light are provided. Image processing means for image-processing the image signal, position detecting means for the pallet, great bar gap width detecting means for detecting the gap width of the great bar from the signal of the image processing means, and the previously measured gap width. The present invention is characterized by including deviation calculation means for calculating a difference from the gap width measured this time, and warning means for issuing a warning signal when the absolute value of the output of the deviation calculation means is larger than a predetermined value.

[0013]

According to the first aspect of the present invention, the gap distance of the great bar is optically measured, while the pallet position detecting means detects the pallet position, and the gap area of the great bar is determined based on the signals of both. Calculation processing is performed, and the calculated value and the set value are compared and calculated, and an alarm signal is issued when the calculated value exceeds the set value. If one of the great bars, which has a structure that fits into the bottom of the pallet, falls off, the drop can be correctly detected, and if the great bar is slanted or is slightly displaced to the left or right, it may be erroneously detected as a drop. Absent. In the invention according to claim 2, the breakage can be detected by outputting an alarm signal as a breakage of the great bar when the gap width signal changes greatly.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the device of the present invention, and FIG. 2 is a plan view of the device of the present invention. The pallet 8 traveling on the return rail engages with the teeth of the sprocket wheel 9 on the mining side, and as the sprocket wheel 9 rotates, it is flipped up while being lifted up and rides on the upper running rail to the sintering raw material mining section Drive toward. Laser light source 1 and linear sensor 2
Are arranged on the same horizontal plane with respect to the grate surface arranged on the pallet 8 that is lifted at the mine side reversing unit, and the laser light source 1 irradiates a slit-shaped light beam.
The irradiated laser beam forms a dotted irradiation light on the great bar 11 which is orthogonal to the traveling direction of the pallet 8.

An image signal obtained by capturing the irradiation light on the grate with the linear sensor 2 is sent to the image processing device 3, and the image processing device 3 analyzes the signals of the black and white pixels of the image signal and sends the signal to the computing unit 4. . Furthermore, the position detection signal from the pulse generator 6 installed on the drive shaft of the sprocket wheel 9 on the mining side is also sent to the same computing unit 4. The calculator 4 calculates the gap area of the great bar 11 from the image processing signal and the position signal, compares it with the set gap area stored in advance in the calculator 4, and when the measured area exceeds the set value, the great bar 11 is calculated.
Is output and an alarm signal is output. In addition, when there is a large change in the measured gap width, the great bar 1
An alarm signal is output as a breakage of 1.

FIG. 3 is a block diagram when the arithmetic unit 4 processes a signal imaged by the linear sensor 2 and image-processed and a position detection signal which is a moving distance of the pallet 8, and FIG. 4 is a block diagram showing its function. is there. The function of the present apparatus shown in FIG. 1 will be described with reference to FIG. 3. The image processing signals (A _{1 to An} ) are input to the calculator 4 as the gap widths (D _{1 to} D _n ). The position detection output signals (B _{1 to} B _n ) are input to the arithmetic unit 4 as the movement amounts (H _{1 to} H _n ) of the great bar 11. The calculator 4 calculates the clearance area by the following equation.

[0017]

[Equation 1]

Here, the unit clearance area is a clearance area for one measurement unit, that is, one position detection signal unit, and the total clearance area is a clearance area for one pallet.
Next, the total clearance area is compared with the comparison setting area stored in advance in the arithmetic unit 4, and if the measured total clearance area is large, the great bar 11 has fallen off.

The comparative set area is calculated by the following equation. Gap reference area S = D _s × H However, D _s is a standard gap when the great bar 11 is mounted on the pallet 8. Comparative set area S _s = αS The coefficient α is set to 3.5 to 5, which is a value obtained from empirical values, for example, 3.5 to 4 if the width of the great bar 11 is 35 mm and the gap is 10 mm. Set by degree. Here, γ = Z−S _s is calculated, and if γ is larger than a predetermined value, the great bar 1
It is a dropout of 1.

The breakage detection is a function of detecting the state in which the gap width of the memory of the arithmetic unit 4 in FIG. 3 changes from D ₃ to D ₄ , and first, the absolute value of the difference between the measured gap width and the immediately preceding value is calculated. Obtained and compared with a value obtained by multiplying the standard gap by a coefficient β of 3.5 to 5. At this time, if the value obtained by multiplying the standard gap by the coefficient β is small, it is determined that the great bar 11 is broken. When expressed in an equation, D _s × β <| D _n −D _n-1 |. Similarly to the above, D _s is a standard clearance when the great bar 11 is mounted on the pallet 8. The coefficient β is a value obtained from empirical values, for example, the width of the great bar 11 is 35 m.
If m and the gap are 10 mm, it is set to about 3.6 to 3.9.

When the great bar 11 is dropped or broken, an alarm signal is output and the alarm 10 is sounded. In addition, the pallet 8 in which the great bar 11 has been dropped and broken
It is also possible to stop the pallet 8 by performing tracking processing on the signal from the position detecting device 5 and sending a stop signal for stopping at the repair position to the pallet 8 operation control device 7.

[0022]

Since the present invention is constructed as described above, the accuracy with which the great bar 11 is dropped or broken is significantly improved. Therefore, it becomes possible to replenish dropped-out points early, which improves the productivity of sintering and saves labor for inspection and monitoring by workers.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus of the present invention.

FIG. 2 is a plan layout view of the device of the present invention.

FIG. 3 is an image diagram when the arithmetic unit 4 processes a signal imaged by the linear sensor 2 and image-processed and a position detection signal which is a movement distance of the palette.

FIG. 4 is a block diagram showing the functions of the device of the present invention.

[Explanation of symbols]

 1 Laser Light Source 2 Linear Sensor 3 Image Processing Device 4 Computing Unit 5 Position Detection Device 6 Pulse Generator 8 Pallet 10 Alarm 11 Great Bar

Claims (2)

[Claims] 1. A means for irradiating slit-shaped light in the width direction of a pallet great bar in a sinter reversal section, a detector for detecting the irradiation light, and image processing of an image signal from the detector. Image processing means, pallet position detection means, great bar gap width detection means for detecting the gap width of the great bar from the signal of the image processing means, signal of the pallet position detection means and great bar gap width detection A baking bar characterized by comprising a great bar gap area calculating means for calculating the great bar gap area from the output of the means and an alarm means for issuing an alarm signal when the calculated great bar gap area exceeds a set value. Great bar dropout detection device. 2. A means for irradiating slit-shaped light in the width direction of the great bar of the pallet at the inverting part of the sintering machine, a detector for detecting the irradiation light, and image processing of the image signal from the detector. Image processing means, position detection means of the pallet, great bar gap width detection means for detecting the gap width of the great bar from the signal of the image processing means, the previously measured gap width and the gap width measured this time. A great bar dropout detecting device for a sintering machine, comprising: deviation calculating means for calculating the difference between the deviations, and warning means for issuing an alarm signal when the absolute value of the output of the deviation calculating means is larger than a predetermined value.