KR20030092253A - Apparatus for detecting trouble of screen in sintering line - Google Patents

Abstract

PURPOSE: An apparatus for detecting trouble of screen in sintering line is provided to improve operating efficiency of facility and remove danger of safety accident by measuring the amplitude during vibration of the screen to judge whether or not there is something wrong with the screen, informing disorder of operator and turning off scraper. CONSTITUTION: In an apparatus for detecting trouble of screen(6) for sorting the cooled sintered ore per sizes by receiving cooled sintered ore from cooler(5) through conveyor belt, the apparatus for detecting trouble of the screen in sintering line comprises a vibration detecting part(50) for outputting frequency signal corresponding to the detected amplitude of the screen by detecting amplitude of the screen; a frequency/voltage conversion part(51) for converting output signal of the vibration detecting part into voltage signal; a filter part(52) for filtering signals outputted from the frequency/voltage conversion part; first comparison part(53) for comparing output voltage of the filter part with first and second set values; an output delay part(54) for outputting comparison output signal of the first comparison part after delaying the comparison output signal for an already set period of time; second comparison part(55) for detecting when voltage signal is larger than the third set value, and driving motor of cooler is operated by comparing voltage outputted from the filter part with third set value; a signal input part(56) for impressing the received operation signal to the second comparison part by receiving operation signal of the driving motor of the cooler; and an output part(57) for outputting signal of amplitude drop alarm, stopping signals of the screen(6) and belt(5a) and scraper operating signal of the cooler depending on the extent that the amplitude of the screen is dropped from a standard value according to outputs of the output delay part and second comparison part.

Description

Screen abnormality detection device in sintering process {APPARATUS FOR DETECTING TROUBLE OF SCREEN IN SINTERING LINE}

The present invention relates to a screen device for crushing the sintered ore in the steelmaking equipment by size, more specifically, to inform the driver of the abnormality of the screen equipment early and to stop the operation of the equipment to prevent equipment accidents, as a result of the equipment operation rate The present invention relates to an anomaly detection device of a screen to improve the quality of the problem and to eliminate the risk of a disaster.

1 is a view schematically showing a sintering process until the sintered ore is generated and transported to the blast furnace bin, which will be described below.

The sintered raw material discharged from the bin 1 is mixed in the mixer 2 and then heated in the sintering machine 3 to form a sintered ore. The sintered ore formed in the sintering machine 3 is transferred to the cooler 5 and the screen 6 through the crusher 4, and is primarily crushed and cooled. It is then transferred to the blast furnace 8 through the belt conveyor 7, only the sintered ore selected through the secondary screen and the third screen is transferred to the blast furnace 8 again.

FIG. 2 shows the structure of the screen 6 in the above-described process, in which sidewalls are arranged so that the first and second meshes 27 and 26 having punch holes of a standard size are arranged up and down. It is fixed to the (21), the first and the second network (26, 27) is fixed to the base frame 23 through the coil spring 22 and the push bar 25, the side wall 21 is fixedly installed do.

The screen 6 configured as described above first enters the first net 27, which is the sintered ore cooled by the cooler 5, to filter out only the first large sintered ore, and then the smaller sintered ore is the second net 26. , The very small sized sintered ore falls down and filters out the sintered ore larger than the punch hole specification of the second net 26.

In more detail, the power generated by the driving of the motor 24 is transmitted to the vibrating body 28 with the unbalanced weight 29 through the joint 31, whereby the vibrating body 28 is While rotating, vibration is generated in the first and second nets 27 and 26, and the body of the screen reciprocates back and forth to sort ores by size.

In the screen device as described above, the ore screening process is normally performed when the amplitude of the screen is at least 8 m / m during vibration, ore loading, damage to the vibrating bearing and gear, shaft failure, loosening of the first and second nets If a dropout, body crack, or component failure occurs, the amplitude of the screen may be lower than the set value.

The reduction in screen amplitude as described above can reduce ore extraction, depositing ore on top of the screen network, thereby overloading the motor while clogging the hopper and causing the sintering machine to stop.

In order to prevent such a situation, conventionally, the amplitude measurement table is attached to the screen device, and the inspector climbs on the upper part of the base frame to visually check the amplitude.

Therefore, conventionally, when an abnormality occurs in the screen equipment, it is difficult to find it early, and there is a problem that the risk of equipment accidents is always included because the measurement results are inaccurate.

The present invention has been proposed to solve the above-mentioned conventional problems, the object of which is to determine the abnormality by measuring the amplitude at the time of vibration of the screen early, without depending on the naked eye of the inspector, and at the same time notifying the driver An object of the present invention is to provide an anomaly detection apparatus for a screen that eliminates the risk of a disaster while improving the facility operation rate by turning off a scraper.

1 is a process chart showing a general sintering process.

2 is a detailed configuration diagram of the screen device during the sintering process.

3 is a configuration diagram of a cooling device in the sintering step.

4 is an enlarged view of a portion C of the cooling device of FIG. 3.

5 is a view showing an installation example of a sensor according to the present invention in the screen device.

6 is a block diagram showing an abnormality detection device of the screen according to the present invention.

7 is an operation timing diagram of the screen abnormality detection apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

50: vibration detection unit 51: frequency / voltage conversion unit

52: filter unit 53: first comparison unit

54: output delay unit 55: second comparison unit

56: signal input unit 57: output unit

According to an aspect of the present invention, there is provided an apparatus for detecting abnormality of a screen, which is supplied by a belt conveyor to a sintered ore cooled in a cooling apparatus and sorts by size.

A vibration detector for detecting an amplitude of the screen and outputting a corresponding frequency signal;

A frequency / voltage converter converting the output signal of the vibration detector into a voltage signal;

A filter unit for filtering a signal output from the frequency / voltage converter;

A first comparing unit comparing the output voltage of the filter unit with first and second set values;

An output delay unit which outputs the comparison output signal of the first comparison unit after a delay for a predetermined time;

A second comparing unit which compares the voltage output from the filter unit with a third set value and detects when the voltage signal is greater than the third set value and the driving motor of the cooling device is operated;

A signal input unit which receives an operation signal of a driving motor of the cooling device and applies it to the second comparison unit;

And an output unit configured to generate an amplitude reduction alarm signal, stop the screen and the belt, and output a scraper operation signal of the cooling device according to the degree of the screen amplitude being lowered from the reference value according to the output of the output delay unit and the second comparison unit. It features.

The above features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

FIG. 5 is a view illustrating an installation of a sensor for measuring amplitude of a screen in the screen abnormality detecting apparatus according to the present invention, wherein the coil springs 22 provided on both sides of the sidewalls 30 of the screen of the vibration detecting unit 50 are shown. It is installed in the upper part, and outputs a frequency signal corresponding to the amplitude of the screen moving when vibrating.

Fig. 6 is a block diagram showing a screen abnormality detection apparatus according to the present invention, wherein the device according to the present invention detects an amplitude of the movement of the screen 6 during operation of the screen 6 and outputs a corresponding frequency signal. A vibration output unit 50, a frequency / voltage conversion unit 51 for converting the output signal (frequency signal) of the vibration detection unit 50 into a voltage signal, and a screen output from the frequency / voltage conversion unit 51 ( A filter unit 52 for filtering the voltage signal corresponding to the amplitude of 6) and a first comparison unit for comparing whether the output voltage of the filter unit 52 is greater than the first and second set voltages VR1 and VR2. 53), an output delay unit 54 for outputting the comparison output signal of the first comparison unit 53 after a delay for a predetermined time period, and a voltage signal output from the filter unit 52 and a third set value. And a second comparing unit 55 for detecting when the voltage signal is larger than the third set value and the driving motor of the cooling device 5 operates. And a signal input unit 56 for receiving an operation signal of the driving motor of the cooling device 5 and applying it to the second comparison unit 55, and the output delay unit 54 and the second comparison unit 55. According to the output, the screen amplitude is lower than the reference value, and the output unit 57 outputs an alarm signal, a stop signal of the screen 5 and the belt 5a, and a scraper hydraulic cylinder on / off signal.

The operation of the screen abnormality detection device configured as described above will be described with reference to the operation timing diagram shown in FIG.

When the sintering process as shown in FIG. 1 proceeds and the cooling apparatus 5 and the screen 6 operate according to the above, the operation of the screen abnormality detecting apparatus according to the present invention also starts.

In conjunction with the operation of the screen 6, the vibration detector 50 measures the amplitude of the vibration of the screen 6 and outputs a frequency signal corresponding to the amplitude. The vibration detector 50 may use a vibration sensor that is commercially available.

Then, the frequency signal corresponding to the amplitude output from the vibration detector 50 is input to the frequency / voltage converter 51, converted into a voltage signal, and after the unnecessary noise is removed from the filter unit 52, Used for screen abnormality detection and control.

As described above, the voltage signal subjected to the signal conversion and filtering (hereinafter, referred to as amplitude detection value) is simultaneously compared to the first comparator 53 and the second comparator 55, and the first, second, and third settings, respectively. The values are compared with the values VR1, VR2, and VR3. The first, second, and third set values VR1, VR2, and VR3 are amplitude reduction thresholds that are preset in order to prevent an occurrence of a facility accident, and generate amplitude reduction alarms, screen stops, and scraper on signals of the cooling device, respectively. The reference value indicating the viewpoint. In the above description, the first set value VR1 corresponds to the deviation A of FIG. 7, the third set value VR3 corresponds to the deviation B, and the second set value VR2 corresponds to the deviation C. FIG. In the above, A> B> C.

Therefore, when the amplitude of the screen 6 falls below the first set value VR1, the high level voltage is output from the operational amplifier OP2 of the first comparator 53 and is input to the output delay unit 54. . The output delay unit 54 delays the output of the operational amplifier OP2 by a set time Tsec and applies it to the first transistor TR1 of the output unit 57. Therefore, after delaying the setting time (Tsec) at the time when the amplitude of the screen 6 falls below the first setting value, while the amplitude of the screen 6 is below the first setting value, 1 LED L1 is turned on, and the first relay RX1 operates to output the screen amplitude drop alarm signal.

Accordingly, the operator recognizes the alarm operation according to the screen amplitude resistance alarm signal output from the output unit 57, and takes appropriate measures.

When the abnormality of the screen 6 is increased and the amplitude of the screen 6 falls below the third set value VR3, the high level voltage is increased from the operational amplifiers OP4 and OP5 of the second comparison unit 55. Is output, and this signal is applied to one input terminal of the AND gate A3. In addition, the on / off signal of the drive motor 43 of the cooling device 5 is applied to the other input terminal of the AND gate A3. Therefore, when the motor 43 of the cooling device 5 is operating and the amplitude of the screen 6 is smaller than the third set value, the high level signal is output from the AND gate A3, and the output unit 57 Is input to the third transistor TR3. Therefore, if the amplitude of the screen 6 falls below the third set value while the cooling device 5 is being driven, the second LED L3 of the output unit 57 is turned on and the third relay RX3 is turned on. Is operated, and the scraper hydraulic cylinder of the cooling device 5 is momentarily operated. As a result, the amount of sintered ore provided from the cooling device 5 to the screen 6 is controlled. Therefore, when the amount of sintered ore temporarily increases, the amount of sintered ore provided from the cooling device 5 to the screen 6 is adjusted as described above, thereby restoring the amplitude of the screen 6 to its normal value.

However, if the screen amplitude does not recover to the normal value even by the above-described processing and falls below the second set value, the high level voltage is output from the operational amplifier OP3 of the first comparator 53. As in the case where the amplitude is lowered below the first set value, the delay time Tsec set by the output delay unit 54 is delayed and then applied to the second transistor TR2 of the output unit 57. Therefore, when the amplitude of the screen 6 falls below the second set value, the second LED L2 of the output unit 57 is turned on and the second relay RX2 is operated to operate the screen 6 and the belt 5a. The stop signal is applied to the drive motors 24 and 5b. As a result, the driving of the screen 6 and the belt 5a is stopped.

Therefore, before the accident occurs, the screen device is stopped so that the operator can take appropriate measures such as repair.

As described above, the screen abnormality detection apparatus according to the present invention measures the amplitude change of the screen for sorting the ore by size, and when the amplitude is lowered, generates an amplitude lowered alarm signal according to the degree of degradation or scrapes of the cooler. By operating the fur or stopping the screen, there is an excellent effect of reducing the occurrence of accidents and preventing the spread of equipment accidents, thereby reducing productivity and maintenance costs.

Claims (3)

In the abnormality detection device of the screen for receiving the sintered ore cooled by the cooling device to the belt conveyor to sort by size, A vibration detector for detecting an amplitude of the screen and outputting a corresponding frequency signal; A frequency / voltage converter converting the output signal of the vibration detector into a voltage signal; A filter unit for filtering a signal output from the frequency / voltage converter; A first comparing unit comparing the output voltage of the filter unit with first and second set values; An output delay unit which outputs the comparison output signal of the first comparison unit after a delay for a predetermined time; A second comparing unit which compares the voltage output from the filter unit with a third set value and detects when the voltage signal is greater than the third set value and the driving motor of the cooling device is operated; A signal input unit which receives an operation signal of a driving motor of the cooling device and applies it to the second comparison unit; And an output unit configured to generate an amplitude reduction alarm signal, stop the screen and the belt, and output a scraper operation signal of the cooling device according to the degree of the screen amplitude being lowered from the reference value according to the output of the output delay unit and the second comparison unit. Abnormality detection device of screen. The method of claim 1, The first set value corresponds to the amplitude decrease by A, the third set value corresponds to the amplitude decrease by B, and the second set value corresponds to the amplitude decrease by C, wherein A> B> C. Abnormality detection device of screen. The device of claim 1, wherein the device is If the amplitude drop of the screen is greater than or equal to the first set value, an amplitude drop alarm signal is output. If the amplitude drop of the screen is greater than or equal to the third set value, an amplitude reduction alarm is output. Outputs a screen and a belt conveyor stop signal when is generated above the second set value.