KR101276362B1 - Pallet position recognition device of sintering machine and air leak detector - Google Patents

Abstract

The present invention provides a pallet position recognition device that recognizes the position of a pallet on a sintering machine stably and with high precision over a long period of time, and an air leak of a sintering machine equipped with this device capable of detecting the air leak caused by the pallet with high precision. In providing a detection device, the pallet position recognition device 32 is each pallet 1 which rotates against the RFID tag 11 and a series of pallets P installed in the outer side of the side wall 8 of each pallet 1 Input from the reader / writer 13 and the reader / writer 13 of the antenna 12 and the RFID tag 11 connected to the antenna 12 capable of transmitting and receiving radio waves between the RFID tag 11 installed in the And a signal processor 14 for detecting and recognizing the position of the pallet 1 on the basis of the identification information of the RFID tag 11, wherein the air leak detecting device 33 of the sintering machine 32 ).

Description

PALLET POSITION RECOGNITION DEVICE OF SINTERING MACHINE AND AIR LEAK DETECTOR}

The present invention relates to a method of preventing air leakage of a sintering machine, and in particular, loads the raw material, forms a packed layer of the raw material, and accurately recognizes the position of each pallet that is circulated endlessly on the sintering machine. By combining the leak detection method, it is a very suitable technique for use for detecting the air leak due to the pallet of the sintering machine.

In the blast furnace steel industry, as shown in FIGS. 9A and 9B, as shown in FIGS. 9A and 9B, a plurality of pallets P are connected in the longitudinal direction of the sintering machine 5 to move in the longitudinal direction, and a series of pallets P The intake means which consists of several wind box 2 fixed and installed in parallel under the pallet P of this is provided. Each pallet 1 has a great bar 7 arranged on the bottom thereof, as shown in the perspective view shown in FIG. 10, on the outside of side walls 8 arranged on both sides with the great bar 7 interposed therebetween. The wheel 10 is provided. As shown in FIG. 9B, a series of pallets P have a front end and a rear end connected to each other, and have a structure that circumvents the inside of the housing 31 of the sintering machine 5 endlessly. 9A is a plan view of the sintering machine 5, and FIG. 9B is a side view. Each wind box 2 is depressurized by intake / exhaust with a blower (not shown) with an intake pipe 17 therebetween. In addition, while the series of pallets P is circulating, the sintered raw material containing coke powder is supplied and loaded to each pallet 1 from the raw material supply hopper 3. The surface of the sintered raw material layer is ignited by the ignition furnace 4 and at the same time is taken in through the wind box 2. In this way, the combustion zone is advanced downward from the surface of the upper portion of the sintered raw material layer 30 (FIG. 11) to continuously manufacture the sintered ore. FIG. 11 shows a cross section of the pallet 1 and the wind box 2, ie the sinterer 5, seen in the longitudinal direction of the sinterer 5. A series of pallets P are rolled on the two rails 26 fixedly fixed to both sides in the housing 31 of the sintering machine 5, and the wheel 10 provided in each pallet 1 rolls, and a sintering machine It moves to the longitudinal direction of (5).

By the way, this sintering machine 5 has the advantage that the sintered ore can be continuously produced, the breakage of the great bar (7) equipped on the bottom of the pallet (1), the side wall (8) between the adjacent pallet (1) There is a disadvantage in that it is difficult to obtain a sealed structure due to the gap between the junction and the wear of the pallet sealing bar 6 (see FIG. 11). That is, there exists a problem that a gap | gap arises and the unnecessary air (air leak) which does not contribute to sintering which does not pass through the sintering raw material layer 30 flows into the wind box 2 in large quantities. If this air leak is large, useless power is consumed for manufacture of sintered ore, and economic loss will be large.

Therefore, as a method of detecting air leaks conventionally, various methods can be considered as disclosed in Patent Document 1 and Patent Document 2, for example, but these are classified into two air leak detection methods. One method is to measure the oxygen concentration in the exhaust gas discharged from the wind box, and the other is a method to measure the flow rate (flow rate) of the exhaust gas. However, in order to detect air leaks caused by pallets in a series of pallets of a sintering machine, the pallets with air leaks can be identified from a series of pallets unless the pallet is correctly located and combined with an appropriate air leak detection method. none. Hereinafter, a conventional method of accurately recognizing the position of an indispensable pallet in order to specify an air leaked pallet will be described. In addition, in this application, "accurately recognizes the position of a pallet" means to identify one pallet among a series of pallets, and the position of the pallet with respect to the position set in the longitudinal direction of the sintering machine, for example. It means to measure with high precision.

Patent Literature 3 discloses a method invention for detecting a line great arrival position before sintering combustion. The pallet position recognition method of the sintering machine of patent document 3 is a pallet position recognition method using the pallet sensor which used the micro switch etc .. The pallet sensor is arrange | positioned in the specific position which the pallet of a sintering machine passes through the upper part, and detects the specific site | part, for example, the advance direction shear of each pallet which passes over this pallet sensor. First, the number of the pallet on the pallet sensor is stored, and when the next pallet is detected by the pallet sensor, the pallet number of the pallet numbered list stored in advance is updated and the time at that time is stored. This is repeated and the pallet's moving speed is calculated from the difference in passing time and the length per pallet. Based on this movement speed, a specific pallet position is calculated | required as distance from an ignition, for example.

Further, Patent Document 4 describes detecting the passage of an object using an RFID tag. The technique of patent document 4 detects the passage of an object, but does not detect a position. In addition, Patent Document 5 describes reading and writing data of a moving object using an RFID tag, an antenna, and an RFID reader / writer. However, the technique described in Patent Document 5 expands the RFID reader / writer detection area by arranging a plurality of antennas in the moving direction of the moving object, and reads a large amount of data between the RFID tag and the RFID reader / writer that move relatively at high speed. It enables writing, not detecting location.

Japanese Laid-Open Patent Publication No. 61-195929 Japanese Laid-Open Patent Publication No. 11-264027 Japanese Laid-Open Patent Publication No. 59-185739 Japanese Unexamined Patent Publication No. 2008-052411 Japanese Unexamined Patent Publication No. 2006-172101

Cremot Gimbo No.56, pages 17-18

However, in the "Pallet Position Recognition Method of Sintering Machine" described in Patent Literature 3, due to the pallet sensor using a micro switch or the like, if the pallet recognition is missed or double reads for some reason, the position to recognize more than one pallet is not found. As a result, the pallet is repaired, and as a result, a pallet that does not have an air leak is repaired, and the pallet to be repaired is left on-line as it is, resulting in a problem that the air leak is not eliminated.

In practice, a series of pallets of a sintering machine are usually composed of 100 or more pallets, and since they travel around the sintering machine at about 90 minute intervals, the pallet sensor needs to detect the passage of the pallet at least 1600 times a day. There is. Since the sintering machine normally operates continuously for 30 days or more, the number of times of recognition is 50000 times in one month, and there is a problem in the durability of the pallet sensor using a micro switch or the like which repeats the switch on and off by mechanical operation. In addition, since the environment around the sintering machine has a severe harsh environment such as high temperature, high humidity, and high dust, it is not easy to maintain a conventional pallet sensor in a normal state with high sensitivity over a long period of time.

In view of the problems of the above-described conventional pallet position recognition device of the sintering machine, the present invention provides a pallet position recognition device of the sintering machine capable of stably and with high accuracy recognizing the position of the pallet that is circulating endlessly on the sintering machine for a long time. A first object of the present invention is to provide an air leak detecting device of a sintering machine, comprising the pallet position detecting device and capable of detecting the air leak caused by the pallet over a long period of time stably and with high accuracy. It is for the second purpose.

The summary of this invention is as having described below.

The pallet position recognition device of the sintering machine of the present invention has a series of endless pallets in which a plurality of pallets that can move and load sintered raw materials are connected in a moving direction, the front end and the rear end of which are connected, and fixed to a housing, A sintering machine comprising a plurality of wind boxes provided below a pallet and an intake pipe connected to a lower end of each of the plurality of wind boxes, and an intake pipe for exhausting gas in the wind box, wherein each of the pallets that circulate in the sintering machine are sintered. A pallet position recognition device for detecting a position in the longitudinal direction, the pallet being installed outside the sidewall of each pallet and capable of writing and reading identification information, and fixed to a housing of the sintering machine, the series of pallets It is possible to transmit and receive a radio wave only for a predetermined time between the RFID tag installed on each pallet to face the A reader / writer to an RFID tag capable of writing and reading signals including an antenna installed at a location, connected to the antenna and including identification information of each RFID tag, and identification information of an RFID tag input from the reader / writer. And a signal processing unit for identifying the pallet passing through the position of the antenna and detecting and recognizing the position of the pallet.

In addition, in the pallet position recognition apparatus of the sintering machine of the present invention, the reader / writer of the RFID tag transmits a probe signal for requesting the identification information to the RFID tag at a predetermined time period via an antenna and returns from the RFID tag. Obtaining identification information from the received reception wave, and outputting the identification information as an identification signal to the signal processing section, wherein the signal processing section is based on the identification signal inputted at this predetermined time period, A position is derived using the information on the arrangement state of the series of pallets set in advance.

In addition, the pallet position recognition device of the sintering machine of the present invention comprises a speed detector for detecting the moving speed of each pallet, the signal processing unit of the movement speed of the pallet input from the speed detector and the arrangement state of the series of pallets The number of each pallet and the position of the sintering machine length direction are derived based on the information.

The air leak detection device of the sintering machine of the present invention is an air leak detection device of the sintering machine provided with the pallet position recognition device of the sintering machine, and is located on the top of the wall facing in the direction orthogonal to the sintering machine length direction of the wind box. One or more laser type oxygen oximeters, each of which is provided with a light emitter and a light receiver facing the width direction of the pallet, emits a laser beam from the light emitter, receives the light with the light receiver, and measures an oxygen concentration in the optical path; From the value of the oxygen concentration in the wind box measured with the said laser type oxygen oximeter, and the position data of each of the said series of pallets obtained by the said pallet position recognition apparatus, the presence or absence and the magnitude | size of the air leak with respect to each said series of pallets are detected. It is characterized by including a data processing device.

According to the pallet position recognition apparatus of this invention described above, the position of the pallet circumventing on the sintering machine endlessly can be recognized with high precision stably over a long period of time. Moreover, according to the air leak detection apparatus of the sintering machine provided with the said pallet position recognition apparatus, it becomes possible to detect the air leak resulting from a pallet with high precision stably over a long period of time.

Moreover, according to the air leak detection using the pallet position recognition apparatus of this invention, the air leak by breakage of the great bar equipped in the bottom face of the pallet, etc., the air leak from the junction part of the side wall between adjacent pallets, and the pallet The air leak due to the wear of the sealing bar can be detected accurately, and the pallet in which the air leak has occurred can be specified reliably. Therefore, by replacing and repairing a pallet with a specific air leak, it is possible to reduce the air leak more widely and stably than in the past. As a result, not only the power consumption of the sintered main air blower is reduced, but also the amount of air drawn normally through the sintered pallet increases, so that the sintered ore can be increased.

1A is a plan view of a sintering machine in which a pallet position recognition device of the present invention is installed.
1B is a side view of the sintering machine in which the pallet position recognition device of the present invention is installed.
2 is a cross-sectional view taken along line AA of FIG. 1A.
3 is a block diagram showing the system configuration outline of the pallet position recognition device of the present invention.
4 is a flowchart of a measurement processing of the pallet position recognition device of the present invention.
5A is a plan view of the sintering machine in which the pallet position recognition apparatus and the air leak detection apparatus of the present invention are installed.
It is a side view of the sintering machine which installed the pallet position recognition apparatus and the air leak detection apparatus of this invention.
FIG. 6 is a cross-sectional view taken along line BB of FIG. 5A.
Fig. 7 is a block diagram showing the system configuration outline of the air leak detection apparatus of the present invention.
FIG. 8 is a partially enlarged view of the laser type oxygen concentration meter of FIG. 6.
9A is a plan view of a conventional sintering machine.
9B is a side view of a conventional sintering machine.
10 is a perspective view of a pallet.
FIG. 11 is a cross-sectional view taken along line CC of FIG. 9A.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, embodiment of the air leak detection apparatus of the sintering machine provided with the pallet position recognition apparatus of this invention, and the pallet position recognition apparatus is described in detail. In addition, in each drawing, the part which has the same function etc. are attached | subjected with the same code | symbol, and description of a figure is simplified and demonstrated clearly.

<1st embodiment>

The schematic structure of embodiment of the pallet position recognition apparatus of the sintering machine of this invention is shown to FIG. 1A, FIG. 1B, FIG. 2, and FIG. 1A and 1B show a sintering machine 5 provided with a position recognizing apparatus according to the present invention, FIG. 1A is a plan view, and FIG. 1B is a side view. As shown in FIG. 1, the sintering machine 5 is fixed to a series of pallets P and a series of pallets P that are movable in the longitudinal direction by connecting a plurality of pallets 1 in the longitudinal direction. Intake means comprising a plurality of wind boxes 2 is provided. As shown in FIG. 10, each pallet 1 arranges the great bar 7 on the bottom surface, and the wheel 10 is located outside the side wall 8 arrange | positioned at both sides with the great bar 7 interposed. ). As shown in FIG. 1B, a series of pallets P are connected to the front end and the rear end, and endlessly circulates in the housing 31 of the sintering machine 5. Each wind box 2 intakes / exhales and depressurizes a blower (not shown) via the intake pipe 17. While the series of pallets P are circling, the sintered raw material containing coke powder is supplied and loaded to each pallet 1 from the raw material supply hopper 3. The surface of the sintered raw material layer 30 is ignited by the ignition furnace 4 and is taken in through the wind box 2. FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1A. The pallet 1 moves by rolling the wheel 10 provided in each pallet 1 on the two rails 26 fixedly fixed to both sides in the housing 31 of the sintering machine 5.

In the present invention, as shown in Figs. 1A, 1B and 2, one RFID tag 11, which is commercially available, is attached to each side surface of all the pallets 1 of the sintering machine 5, respectively. The mounting position of the RFID tag 11 is, for example, two wheels adjacent to the trolley 9 below the side wall 8 in the height direction and in the longitudinal direction of the sintering machine 5 in the traveling direction ( It is good to set it as the center between 10 and 10). In this embodiment, the RFID tag 11 may use a passive type. The reason for the selection is that there is no need for the battery replacement because the power supply is unnecessary. Since the pallet 1 to be mounted is forcible as the passive RFID tag 11, a UHF band RFID tag 11 having a long communication distance in the on-metal state may be used. Each RFID tag 11 mounted on each pallet 1 holds identification information such as a corresponding pallet number in advance.

RFID stands for Radio Frequency Identification, and transmits and receives desired information from a tag (tag made of IC chip) in which ID information recorded in the internal memory is inserted by short-range wireless communication using radio waves or the like. With respect to this RFID tag, it is possible to read and write desired information to a memory in the RFID tag by using an external transceiver.

On the other hand, as shown in Figs. 1A, 1B, and 2, an RFID tag 11 mounted on a side surface of the pallet 1 includes an information read / write antenna 12 for transmitting and receiving radio waves between the RFID tag 11. 11) is fixedly installed on the housing 31 side of the sintering machine 5 in a direction facing the information read / write antenna (hereinafter also referred to as an antenna) 12 in the front facing direction. The distance between the RFID tag 11 and the antenna 12 when the RFID tag 11 mounted on the pallet 1 passes through the front of the antenna 12 is, for example, about 1 m. As shown in Fig. 3, the antenna 12 is connected to the signal processing unit 14 via the reader / writer 13 which writes and reads information to the RFID tag 11 via the signal line RF18. When the pallet 1 provided with the RFID tag 11 passes near the front of the antenna 12, the RFID tag 11 read by the reader / writer 13 is based on, for example, a signal of a number. The signal processor 14 recognizes the number of the pallet 1. In the present embodiment, the RFID tag number is determined so that the RFID tag number is the same as the pallet number, so that the trouble of matching both numbers is omitted.

The structure of the pallet position recognition apparatus 32 shown in FIG. 3 is demonstrated in detail. In this embodiment, a probe signal for requesting an identification signal based on the identification information of the RFID tag 11 from the reader / writer 13 at an interval of, for example, one second, is output toward the antenna 12, and the antenna ( The transmission wave of the probe signal is transmitted from 12). After the transmission wave is received by the RFID tag 11, the antenna 12 receives the transmission wave returned from the RFID tag 11 as a response signal. In addition, a received signal is input from the antenna 12 to the reader / writer 13. Next, identification signals such as numbers are output from the reader / writer 13 to the RFID input unit 19 of the signal processing unit 14. The RFID input unit 19 of the signal processing unit 14 recognizes an RFID tag number, that is, a pallet number, from the information included in the identification signal. In addition, the RFID input unit 19 bundles the identification signal such as the pallet number and the input time and stores the received time in a built-in memory. At this time, if the order of the signal input from the reader / writer 13 is added to each identification signal to be stored, it is useful in subsequent signal processing. In addition, the signal processing unit 14 has a built-in clock function unit (not shown). In this embodiment, the moving speed (pallet speed) of the pallet 1 in the operating state of the sintering machine 5 shall be about 2500 cm / min. In this case, the number of reads per pallet 1 is about 10 to 14 times. In this case, when converted from the transmission / reception cycle (1 second) and the pallet speed, the RFID tag 11 is about 20 to 30 (2500 / (10 to 10) from the center of the antenna 12 to the left and right (that is, the longitudinal direction of the sintering machine). 14)) RFID tag 11 in a moving range of cm is read out. Since the length in the longitudinal direction of each pallet 1 is normally 1.5 m, it is judged that the RFID tag 11 attached to the pallet 1 nearby is not read incorrectly. In addition, the function for measurement which each part included in the said reader / writer 13, the RFID input part 19, and the signal processing part 14 demonstrated below is performed based on control by the measurement control part 24. FIG. .

As described above, when transmitting and receiving a signal between the RFID tag 11 and the antenna 12, it is necessary to prevent the signals from the adjacent RFID tag 11 from overlapping. Therefore, there is a minimum value L0 that can be installed in the interval L of adjacent RFID tags 11. This minimum distance L0 is determined by the directivity for transmitting and receiving radio waves of the antenna 12 and the RFID tag 11 and the shortest distance between the antenna 12 and the moving RFID tag 11. Moreover, what is necessary is just to determine suitably the space | interval L of the RFID tag 11, and the space | interval with the series of pallets P of the antenna 12 in the range which becomes (space | interval L> minimum space | interval L0).

In this embodiment, when the pallet 1 passes in front of the antenna 12, the number of reads per RFID tag 11 installed is 10 or more times as described above, whereby the RFID tag 11 The identification signal is never read without being blown.

In addition, in this embodiment, in order to measure the moving speed (pallet speed) of the pallet 1, the speed detector 15 comprised, for example with PLG, is installed in the housing 31 of the sintering machine 5 (FIG. 3). For example, the pulse signal output from PLG is input to the speed signal input part 20 of the signal processing part 14 as shown in FIG. When there is a case where an identification signal including a pallet number is sent out due to a defect of the RFID tag 11 or the like, the pallet number is not input at a timing calculated from the pallet speed output from the speed detector 15. It is possible to detect the pallet number of the RFID tag 11 which is not read and blown based on the pallet number of the RFID tag 11 before and after the RFID tag 11. For example, when the number of the RFID tag 11 attached to the pallet 1 behind the defective RFID tag 11 is read, the arrangement process of the pallet number is stored in advance in the signal processing unit 14, Even if one RFID tag 11 is read without being read, the number can be interpolated. In the present embodiment, the speed detector 15 is used as described above, the pallet speed is put in parallel with the signal processing unit 14, and the pallet speed is compared with the number (ie, pallet number) from the RFID tag 11. The misrecognition prevention part 22 which has a function is provided in the signal processing part 14, and the misrecognition of the pallet number, such as sending out unreadable and flying, is prevented.

In addition, in the pallet position calculation part 23 of FIG. 3, the speed is based on the arrangement | positioning order of the pallet 1 memorize | stored in advance, the arrangement | positioning order of the pallet number, and the initial position which is the initial state of operation of a series of pallet Ps. Based on the pallet speed by the detector 15, the position in the longitudinal direction of the sintering machine 5 of each pallet 1 is recognized. For example, a series of pallets P consists of 100 pallets, and each pallet 1 is numbered 1 to 100 in order. In addition, as an initial state of operation, it is assumed that the front end of the 1st pallet is at the reference position of the inlet side (raw material supply hopper 3 side) of the sintering machine 5 at some time TO. Based on the information of the arrangement state of the pallets P series described above, the speed detector 15 in recognizing the position by the RFID tag 11 attached to the pallet 1 at a certain time Tm. The traveling distance Lm (Lm = Vm × (Tm-TO)) in the sintering machine 5 of the pallet can be calculated from the speed detection value Vm and the time Tm-TO by The position of the pallet 1 with respect to the reference position can be derived from the traveling distance Lm and the distance of the pallet 1 and the pallet. Based on the calculated position and the identification signal input from the RFID tag 11 attached to the pallet 1, the difference between the derived value and the position of the pallet 1 derived by the process described below is 10 cm or more. In the case of a misalignment, the present embodiment adopts a method of correcting the position of the pallet 1 by making the measured value of the position based on the identification signal from the RFID tag 11 positive. In addition, the center of the installation position of the sintering machine 5 longitudinal direction of the antenna 12 may be made into the reference position instead of the said reference position.

The method of recognizing the position of each pallet 1 using the detected value Vm and time Tm of the pallet speed by the speed detector 15 mentioned above is slip or rebound for structural reasons of the sintering machine 5. Since there is a problem in measurement accuracy that it is difficult to avoid the back, it is not preferable as a stable and highly accurate pallet position recognition method. For example, when an error accumulates and one pallet (1.5 m) is shifted | deviated, the same problem as the method described in patent document 1 mentioned above arises. Therefore, the pallet position recognition method of this invention which estimates the position of the pallet 1 based on the identification signal input from the RFID tag 11 is used.

In the pallet position recognition apparatus of the present embodiment, an example of a flow of pallet position recognition processing is obtained from the pallet 1 and an identification signal consisting of a number and the like is executed by the signal processing unit 14 based on the identification signal. Will be described below based on FIG. 4.

S100: Identification data acquisition processing

First, under the control of the RFID input unit 19, based on the probe signal for obtaining the identification signal output from the reader / writer 13, the transmission of the constant period ΔT from the antenna 12 toward the pallet 1 side ( Alternatively, at the time of reception Tm (m = 0, 1, 2, ...), the transmission wave of the probe signal is transmitted at, for example, one second interval. Next, the antenna 12 receives the received wave as a response from the RFID tag 11 to the transmission wave of the probe signal transmitted from the antenna 12 at a predetermined period ΔT and transmits it to the reader / writer 13. do. The reader / writer 13 detects a response signal including identification information such as a pallet number from the signal of the received wave, and inputs the response signal to the RFID input unit 19. However, when there is no normal RFID tag 11 at a position facing the antenna 12, a response signal is not output from the reader / writer 13, and a response signal including identification information is not input to the RFID input unit 19. Do not. At this time, a NULL signal not including identification information is input to the RFID input unit 19 at a predetermined period ΔT. The RFID input unit 19 binds an undetected signal (for example, "NULL") from the input response signal to an identification signal such as a pallet number or a NULL signal as the identification time data Dm. In turn, write to the built-in memory. In this case, a series of numbers N may be added to each pair of the transmission time signal Tm and the identification signal. In addition, identification data Dm is input to the erroneous recognition prevention part 22 and the pallet position calculation part 23 in order. The above processing may be executed in synchronization with a time signal (timing signal) output from the clock function unit incorporated in the measurement control unit 24.

S101: Pallet pass detection processing

The RFID input unit 19 also generates a pallet pass signal Vps, assuming that one pallet (installed RFID tag) has been passed when a predetermined number of times, " NULL " Next, the RFID input unit 19 sequentially inputs the pallet pass signal Vps to the misrecognition prevention unit 22. The pallet pass signal Vps may also be input to the pallet position calculating unit 23. The above processing may be executed in synchronization with a time signal (timing signal) output from the clock function unit incorporated in the measurement control unit 24.

S102: Pallet Position Calculation Processing

The pallet position calculation unit 23 receives, for example, the first reception using the identification data Dm from one pallet's RFID tag based on the continuous identification data Dm sequentially input from the RFID input unit 19. Two intermediate times are obtained from the time and the final reception time, and it is recognized that the center of the line length direction of the pallet 1 on which the RFID tag 11 is mounted was located at the front of the antenna 12 at that time. In addition, in performing such a process, you may use the pallet passing signal Vps as a start signal.

S103: Process pallet position error

On the other hand, in the pallet position calculation part 23, the speed detection value Vm by the speed detector 15 is input into the speed signal input part 20, and the said speed detection value Vm and time from a measurement start (Tm-TO) ), The travel distance Lm (Lm = Vm × (Tm-TO)) in the sintering machine of the first pallet (the first pallet) can be calculated, and the travel distance Lm and the first pallet And the position of each pallet with respect to the reference position from the distance from each pallet. Thus, an error between the pallet position calculated from the pallet speed and the pallet position recognized by S102 is calculated, and when the error is less than ± X cm, the pallet position calculated from the pallet speed is defined as positive. Output In addition, when the error is more than an allowable range ± Xcm, the position of each pallet at the present time on the sintering machine computed from the pallet speed is correct | amended by the pallet position recognized by S102 as a positive. In the present embodiment, for example, X = 10 cm, but it is appropriately set based on the desired position detection accuracy.

S104: Misrecognition of pallet numbers

The misidentification prevention unit compares the measured value of the pallet position derived in S103 with the identification data Dm obtained in S100 based on the measured value of the pallet speed by the speed detector 15 and the RFID tag and the reader / writer 13. The processing for preventing misrecognition when deriving the pallet number based on the pallet speed, for example, by blowing the response signal due to a transmission / reception error or the like, is executed. In addition, this misrecognition process may be used when deriving the pallet number based on the pallet speed by the speed detector 15 as a main position detecting means. It is not necessary to necessarily use the response signal from an RFID tag as a main position detection means.

S105: Output Results and Record

The calculation result and the drawing result obtained by each of the above processes are output by the output unit 25 to a computer display or the like for presentation to an operator or the like.

Although the position recognition accuracy of the pallet 1 is improved by the above-mentioned process, the reading situation is changed subtly by the direction of the RFID tag 11, the direction of the antenna 12, the height position relationship between them, etc. It was proved by an offline test. Therefore, in carrying out the present invention, in the installation of the RFID tag 11 and the antenna 12, careful attention should be paid to the directivity and arrangement of each device.

As described above, the signal processor 14 includes an RFID input unit 19, a speed signal input unit 20, a pallet number misrecognition prevention unit 22, a pallet position calculation unit 23, a measurement control unit 24, and an output unit. It consists of 25 (refer FIG. 3). The signal processor 14 may be configured as a computer system. The computer system may be composed of a CPU, a main memory device, an external storage device such as an HDD, an input device such as a keyboard or a mouse, and a computer display. Further, a pallet position recognition device of the sintering machine of the present invention is produced by creating a computer program for causing the computer system to execute a series of processes for recognizing the pallet positions described in S100 to S105, and loading the same into the main memory device. Can be implemented.

<2nd embodiment>

Embodiment of the air leak detection apparatus of the pallet of the sintering machine which is 2nd invention of this application is demonstrated in detail using FIGS. 5A-8. The air leak detection apparatus in this embodiment is equipped with the pallet position recognition apparatus of 1st invention illustrated above. In addition, in the drawing of the following description, the code | symbol of the apparatus and part which has the function similar to the said figure attaches | subjects the same code | symbol, and avoids the trouble of drawing.

5A and 5B show a sintering machine 5 provided with an air leak detection apparatus according to the present invention. Fig. 5A is a plan view and Fig. 5B is a side view. As shown in FIGS. 5A and 5B, the sintering machine 5 has a plurality of pallets 1 connected in the longitudinal direction, and a series of pallets P and a series of pallets P which are movable in the longitudinal direction. An air intake means comprising a plurality of wind boxes 2 fixed to the windshield. As shown in FIG. 10, each pallet 1 has wheels 10 on the outer side of side walls 8 arranged on both sides with the great bars 7 arranged on the bottom thereof with the great bars 7 interposed therebetween. Equipped with. As shown in FIG. 5B, a series of pallets P are connected to the front end and the rear end, and are wound around the housing 31 of the sintering machine 5 without end. Each wind box 2 is depressurized by a blower (not shown) through the intake pipe 17. While the series of pallets P is circulating, the sintered raw material containing coke powder is supplied to each pallet 1 from the raw material supply hopper 3, and the sintered raw material layer 30 is formed. The surface of the sintered raw material layer 30 is ignited by the ignition furnace 4 and is taken in through the wind box 2. FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5A. In addition, sectional drawing seen from the A-A line | wire of FIG. 5A is as FIG. As described above, the present embodiment includes the pallet position recognition device 32 described in the first embodiment. In addition, the pallet 1 rolls on the two rails 26 fixedly fixed to both sides in the housing 31 of the sintering machine 5, and the wheel 10 provided in the side surface of each pallet 1 rolls. Move. In the following description of this embodiment, since the description regarding the pallet position recognition apparatus 32 is the same as that of the said 1st Embodiment, it abbreviate | omits.

In this embodiment, as shown to FIG. 5A, FIG. 5B, and FIG. 6, the wind box located just below the pallet 1 of the line longitudinal direction (the moving direction of the pallet 1) of the sintering machine 5 ( In order to oppose the width direction of the pallet 1 at the uppermost part of the side wall 2a of 2), and to detect the fluctuation | variation of the oxygen concentration in the wind box 2, For example, Nonpatent literature 1 (creation report No. The light emitter 16a for emitting the laser light of the laser type oxygen oximeter 16 described in pages 56 and 17-18 and the light receiver 16b for detecting the laser light are provided. The reason for the installation on the upper side of the side wall 2a of the wind box 2 is that the air leak introduced from the pallet 1 into the wind box 2 is diffused as it is drawn downward toward the intake pipe 17, so that oxygen It is because it is preferable to be close to the pallet 1 as much as possible in order to specify the air leak part of the pallet 1 by measurement of a density | concentration. At this time, in order to make the air leak detection sensitivity even in the width direction of the pallet 1, the optical axis 16c of the laser beam parallel to the direction which connects the light emitter 16a and the light receiver 16b is horizontal with respect to the ground, and What is necessary is just to be parallel to the bottom surface of the pallet 1. In addition, in order to facilitate the identification of the pallet 1 in which air leakage occurs, the light emitter 16a and the light receiver 16b are provided so that the optical axis 16c is perpendicular to the line length direction of the sintering machine 5. do.

7 shows the configuration of the air leak detection apparatus 33 of the present embodiment. This air leak detection apparatus 33 is equipped with the pallet position recognition apparatus 32 shown in FIG. 3 mentioned above. As shown in FIG. 7, the laser type oxygen concentration meter 16 is connected to the measurement control unit 24 via the oxygen concentration signal input unit 21, and measures the oxygen concentration based on the control by the measurement control unit 24. Is executed. Moreover, the laser type oxygen concentration meter 16 is connected with the data processing apparatus 41 which detects the presence or absence of an air leak with respect to each pallet based on the measurement of oxygen concentration. The data processing device 41 is made of, for example, a personal computer.

In this embodiment, as shown to FIG. 6, FIG. 8 (part enlarged view), the mount 26a of the rail 26 of the both sides which the wheel 10 of the pallet 1 rolls, and the wind box 2 of Through holes are formed at opposite positions of the side walls 2a, respectively, and a purge tube 27 is passed through each of the through holes, so that the ends of the light emitter 16a and the other purge tube 27 are passed through the end of one purge tube 27. The light receiver 16b is connected to the edge part via the flange 28, respectively. The sealing glass window 29 for protection is formed in each light path in the exit port of the light emitter 16a, and the light receiver of the light receiver 16b. In order to prevent contamination of the sealing glass window 29 and to prevent clogging of the purge tube 27 due to dust in exhaust gas or the like, the sealing glass window of the light emitter 16a and the light receiver 16b is disposed in the purge tube 27. Nitrogen gas is blown into the wind box 2 from 29 to the purge gas. However, the flow rate of blowing the nitrogen gas is such that the composition of the exhaust gas is not significantly affected by the injected nitrogen gas. The purge gas may be a gas that does not interfere with the oxygen concentration measurement other than nitrogen gas.

In the normal state without air leak, the oxygen concentration in the exhaust gas in each of the wind boxes 2 of the sintering machine 5 is supplied to the sintering raw material in the longitudinal direction of the sintering machine 5 shown in Figs. (給 鑛 側): near 17 to 20% in the upper part of the pallet movement, and gradually decreases to 10% or less as it goes to the middle part of the longitudinal direction, and rises again to 21% in the light distribution (below the pallet movement). To be close. This is because the firing reaction still occurs only in the vicinity of the surface of the combustion raw material layer 30 (upper part) on the light-expansion side, so that unreacted oxygen reaches the wind box 2 as it is. Since the oxygen of the reaction decreases and the calcination reaction itself ends on the light distribution side, the oxygen concentration can be considered to rise again.

Therefore, since the air leak is air and the oxygen concentration is 21%, the position where the air condition is likely to be different from the normal state without air leak due to deterioration of the pallet 1, or the abnormal state with air leak, that is, the oxygen concentration is low. It is good to provide the laser type oxygen concentration meter 16 in the middle part of the longitudinal direction of the sintering machine 5 which is stable from above. However, if it is impossible to install in the middle part due to the installation space, it is possible to detect the air leak by selecting and installing the part where the oxygen concentration is extremely stable even at a high level.

In addition, since the ambient temperature of the wind box 2 rises closer to the light distribution side, considering the heat resistance and maintenance of the light emitter 16a and the light receiver 16b of the laser-type oxygen concentration meter 16, among the middle parts, It is better to install it on the side near the dimming side. In addition, the dust in the exhaust gas in the wind box 2 is also less favorable on the light-receiving side, and the effect of attenuation of the laser light due to dust and the clogging of the purge tube 27 are also advantageous.

As an example, in the said embodiment, the laser type oxygen concentration meter 16 was provided in the seventh wind box 2 from the light supply side among all 26 wind boxes 2. The oxygen concentration in the normal operating state at this installation position is around 7%, but this value rises to 8 to 9% when the pallet 1 with air leak passes. Therefore, in this case, the alarm is output at the oxygen concentration of 8% or more, and the operator is notified of the air leak.

The diameter of the laser beam of the laser type oxygen oximeter 16 used here is sufficiently small, about 20 mmF, and has a responsiveness of about 3 seconds. By installing the position recognition device in the line length direction of each pallet 1 in the sintering machine 5, measuring the position of each pallet 1, and using the oxygen concentration measurement value obtained by the laser type oxygen concentration meter 16, It is possible to specify not only the pallet 1 in which the air leak is generated among the series of pallets P but also the air leak position in the advancing direction in the specific pallet 1. At that time, the data of the pallet position and the oxygen concentration data are input to the data processing device 41 which is constituted using a personal computer or the like through the I / O board, and the air leak is detected from the abnormality of the oxygen concentration. It may be displayed on the computer display together with the pallet number being generated.

In addition, although the structure which used one laser type oxygen concentration meter was demonstrated above, it is clear that you may comprise an air leak detection apparatus using multiple units.

As explained above, according to the pallet air leak detection apparatus 33 of the sintering machine which is 2nd Embodiment of this invention, the oxygen concentration in a windbox is measured with the high sensitivity using the laser type oxygen concentration meter 16, The air leak in the pallet passing through the mounting positions of the light emitter 16a and the light receiver 16b of the laser type oxygen oximeter 16 can be detected with high sensitivity. Moreover, since the pallet position recognition apparatus 32 demonstrated in 1st Embodiment is provided, the number of the pallet which passes through the installation position of the light emitter 16a and the light receiver 16b of the laser type oxygen concentration meter 16, etc. are mentioned. In addition, even the air leak position of the sintering machine longitudinal direction in the said pallet can be specified with high precision.

In addition, in the first and second embodiments, since the used RFID tag 11 can also write information to the tag, each time the RFID tag 11 passes in front of the antenna 12, the RFID tag 11 The number of operations n written in the RFID tag 11 together with the number of 11 is read, and the number n + 1 of counting up once is read into the RFID tag 11, for example, by the signal processing unit 14. To control it. By doing in this way, since the operation | movement frequency of each pallet 1 on the online of the sintering machine 5 can be known, it becomes an effective means of determining the maintenance order of the pallet 1. In addition, the signal processing unit 14 can be connected via a network with a higher level computer that manages the operation of the sintering machine, or an input / output unit for workers can be provided in the signal processing unit 14, and maintenance information such as repair history can be written. Therefore, it becomes possible to use as a tool of operation management, trouble prevention, and device maintenance.

In addition, although the pallet air leak detection apparatus 33 of the sintering machine demonstrated in 2nd Embodiment uses the method of measuring the oxygen concentration in the wind box 2 with a laser type oxygen concentration meter as an air leak detection apparatus, Instead, it is obvious that other well-known air leak detection systems can also be adopted.

Industrial availability

As mentioned above, the pallet position recognition apparatus of this invention and the air leak detection apparatus using this apparatus are detailed as an example which detects the air leak resulting from the pallet in the sintering process which manufactures a sintered ore in the blast furnace steelworks which is a higher process of the steel industry. As described above, the pallet position recognition device and the air leak detection device of the present invention can be applied to the detection of the position of a moving device or the gas inflow of the device in other processes of the steel industry or the same process in other industries. Obvious.

1 pallet
2 windbox
2a sidewall
3 raw material feeding hopper
With 4 lighting
5 sintering machine
6 pallet sealing bar
7 Great Bars
8 sidewalls
9 balance
10 wheels
11 RFID Tag
12 antennas
13 Reader / Writer
14 signal processor
15 speed detector
16 Laser Oximeter
16a light emitter
16b receiver
16c optical axis
17 intake pipe
18 signal line RF
19 RFID Input
20 speed signal input
21 Oxygen Concentration Signal Input
22 misunderstanding prevention part
23 pallet position calculator
24 measurement control
25 outputs
26 rails
27 purge tube
28 flange
29 sealed glass window
30 Sintered Raw Material Layer
31 Housing
32 pallet positioner
33 Air Leak Detection Device
41 Data Processing Unit
P series of pallets

Claims (4)

A plurality of endless pallets in which a plurality of pallets which are loaded and moveable in the sintering raw material are connected in a moving direction, the front end and the rear end of which are connected, a plurality of wind boxes fixed to the housing and installed under the series of pallets In the sintering apparatus which is connected to the lower end part of each of these wind boxes, and consists of an intake pipe for exhausting the gas in the said wind box, the pallet position recognition which detects the position of the sintering machine longitudinal direction of each said pallet circulating in a sintering machine A sintering machine having a device and an air leak detection device,
The pallet position recognition device, RFID tag is provided on the outside of each side wall of the pallet, and capable of writing and reading identification information,
An antenna fixed to the housing of the sintering machine and installed at a position opposite to the series of pallets and capable of transmitting and receiving radio waves only for a predetermined time between the RFID tags installed on each pallet that is circulated;
A reader / writer to an RFID tag connected to the antenna and capable of writing and reading a signal including identification information of each RFID tag;
A signal processing unit for identifying a pallet passing through the position of the antenna based on identification information of the RFID tag input from the reader / writer, detecting the position of the pallet, and recognizing the pallet;
The air leak detection device is provided with a light emitter and a light receiver facing the width direction of the pallet, respectively, on an upper portion of the wall facing the direction perpendicular to the longitudinal direction of the sintering machine of the wind box. One or a plurality of laser type oxygen oximeters which emit light to be received by the light receiver and measure the oxygen concentration in the optical path;
Detecting the presence and size of air leak with respect to each of the series of pallets from the value of the oxygen concentration in the wind box measured by the laser type oxygen concentration meter and the position data of each of the series of pallets obtained by the pallet position recognition device. A sintering machine comprising a pallet position recognition device and an air leak detection device, characterized by comprising a data processing device. The RFID tag reader / writer transmits a probe signal for requesting the identification information to the RFID tag at a predetermined time period through an antenna, and obtains the identification information from the received wave returned from the RFID tag. Outputting this identification information to the signal processing unit as an identification signal,
The signal processing unit derives the number of each pallet and the position of the sintering machine length direction based on the identification signal input at this predetermined time period, using information on the arrangement state of the series of pallets set in advance. Sintering machine equipped with a pallet position detection device and an air leak detection device. The method of claim 2,
The pallet position recognition device further comprises a speed detector for detecting the moving speed of each pallet,
And the signal processing unit derives the number of pallets and the position of the sintering machine in the longitudinal direction based on the movement speed of the pallets inputted from the speed detector and the arrangement state of the pallets. Sintering machine equipped with air leak detection device. delete

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