JP5269496B2 - Pallet position recognition device and air leakage detection device for sintering machine - Google Patents

Abstract

The invention provides a pallet position identification device that can stably and accurately identify the positions of pallets in a sintering machine over a long period of time, and an air leakage detector for a sintering machine equipped with the pallet position identification device that can stably and accurately detect air leakage attributable to a pallet over a long period of time. The pallet position identification device 32 comprises RFID tags 11 mounted on the outsides of the sidewalls 8 of the individual pallets 1, an antenna 12 facing the pallet train P at a position where it can transmit/receive radio waves to/from the RFID tags 11 mounted on the circulating pallets, an RFID tag reader/writer 13 connected to the antenna 12, and a signal processing unit 14 for detecting and identifying the positions of the pallets 1 based on the discrimination data of the RFID tags 11 acquired from the reader/writer 13. The sintering machine air leakage detector 33 is equipped with the pallet position identification device 32.

Description

  The present invention relates to a method for preventing air leakage of a sintering machine, and more specifically, forms a packed layer of the raw material by placing the raw material, and accurately recognizes the position of each pallet that circulates endlessly on the sintering machine. By combining this with an appropriate air leakage detection method, this is a technique suitable for detecting air leakage caused by the pallet of the sintering machine.

  In the blast furnace steel industry, as shown in FIG. 9, the sintering machine is composed of a series of pallets P in which a number of pallets 1 are connected in the longitudinal direction of the sintering machine 5 and movable in the longitudinal direction, and a series of pallets P. And an air intake means composed of a plurality of window boxes 2 fixed in parallel below. As shown in the perspective view shown in FIG. 10, each pallet 1 is provided with the wheels 10 on the outside of the sidewalls 8 arranged on both sides with the great bars 7 arranged on the bottom surface with the great bars 7 arranged on the bottom surface. As shown in FIG. 9B, the series of pallets P have their front and rear ends connected to each other and endlessly circulate in the casing 31 of the sintering machine 5. 9A is a plan view of the sintering machine 5, and FIG. 9B is a side view. Each window box 2 is decompressed by intake / exhaust by a blower (not shown) through an intake pipe 17. Then, during the lap of the series of pallets P, a sintering raw material containing coke powder is supplied to each pallet 1 from the raw material supply hopper 3 and loaded. The surface of the sintered raw material layer is ignited by the ignition furnace 4 and simultaneously sucked through the wind box 2. By being sucked in this way, the combustion zone is advanced downward from the upper surface of the sintered raw material layer 30 (FIG. 11), and the sintered ore is continuously produced. FIG. 11 shows a cross-sectional view of the pallet 1 and the window box 2, that is, the sintering machine 5 as seen from the longitudinal direction of the sintering machine 5. The series of pallets P are rolled on the two rails 26 fixedly provided on both sides in the casing 31 of the sintering machine 5, so that the wheels 10 provided on each pallet 1 roll, whereby the sintering machine 5. It moves in the longitudinal direction.

  By the way, this sintering machine 5 has an advantage that it can continuously produce sintered ore, but breakage of the great bar 7 provided on the bottom surface of the pallet 1, the connection portion of the sidewall 8 between the adjacent pallets 1. There is a disadvantage that it is difficult to make a sealed structure due to the gap and the wear of the pallet seal bar 6 (see FIG. 11). That is, there is a problem that a gap is generated there, and a large amount of useless air (air leakage) that does not contribute to the sintering does not pass through the sintering raw material layer 30 flows into the wind box 2. If there is a lot of this air leakage, the wasteful power will be consumed for the production of sintered ore, which will be a large economic loss.

  For this reason, conventionally, various methods have been conceived as disclosed in, for example, Patent Document 1 and Patent Document 2 as methods for detecting a wind leak, but these are classified into two methods for detecting a wind leak. One is a method for measuring the oxygen concentration in the exhaust gas discharged from the wind box, and the other is a method for measuring the flow rate (flow velocity) of the exhaust gas. However, in order to detect air leakage caused by pallets in a series of pallets of a sintering machine, if the position of the pallet is accurately grasped and not combined with an appropriate air leakage detection method, the air will leak from the series of pallets. It is not possible to specify the pallet. Hereinafter, a conventional method for accurately recognizing the position of a pallet indispensable for identifying a pallet that is leaking air will be described. In the present application, “accurately recognizes the position of the pallet” means to identify one specific pallet in a series of pallets, and to the pallet for a certain position set in the longitudinal direction of the sintering machine, for example. This means that the position of is measured with high accuracy.

  Patent Document 3 discloses an invention of a method for detecting the arrival position of a sintered combustion front great. The pallet position recognition method for a sintering machine described in Patent Document 3 is a pallet position recognition method using a pallet sensor using a microswitch or the like. A pallet sensor is arranged at a specific position where the pallet of the sintering machine passes above, and a specific part of each pallet passing on the pallet sensor, for example, a front end in the traveling direction is detected. First, the number of the pallet on the pallet sensor is stored. When the next pallet is detected by the pallet sensor, the pallet number in the pallet number order list stored in advance is updated and the time at that time is stored. This is repeated, and the moving speed of the pallet is calculated from the difference in passing time and the length per pallet. Based on this moving speed, a specific pallet position is obtained, for example, as a distance from the ignition furnace.

JP-A 61-195929 Japanese Patent Laid-Open No. 11-264027 JP 59-185739 A Kurimoto Technical Report NO. 56, 17-18

  However, in the “pallet position recognition method of the sintering machine” described in Patent Document 3, because of a pallet sensor using a microswitch or the like, once pallet recognition omission or double reading occurs for some reason, the entire pallet As a result, the recognition position is shifted, and as a result, a pallet that is not leaking is repaired, and on the contrary, a pallet that must be repaired is left as it is, and there is a problem in that the leakage is not solved.

  Actually, a series of pallets of a sintering machine is usually composed of 100 or more pallets, and the pallet sensor makes at least 1600 times a day since it circulates in the sintering machine every 90 minutes. It is necessary to detect the passage of Since the sintering machine normally operates continuously for 30 days or more, the recognition frequency is 50,000 times in one month, and it is durable in the pallet sensor using the micro switch etc. that repeats ON / OFF of the switch by mechanical operation. There is a problem in terms of sex. Also, because the environment around the sintering machine is extremely harsh in terms of high temperature, high humidity, high dust and sensor environment, it is not easy to maintain a conventional pallet sensor in a normal state with high sensitivity over a long period of time. Absent.

  In view of the above-described problems of the conventional pallet position recognition device for a sintering machine, the present invention provides a stable and accurate position of the pallet that circulates endlessly on the sintering machine over a long period of time. A first object of the present invention is to provide a pallet position recognition device for a sintering machine that can be well recognized. The pallet position recognition device includes the pallet position recognition device. A second object of the present invention is to provide an air leakage detecting device for a sintering machine that can detect the air accurately.

  The gist of the present invention is as described below.

The pallet position recognition device of the sintering machine of the present invention is a series of endless pallets in which a plurality of movable pallets are connected in the moving direction with the sintering raw material loaded, and the leading end and the trailing end are connected. A plurality of windboxes fixed to the casing and disposed under the series of pallets, and an intake pipe connected to the lower end of each of the plurality of windboxes for exhausting gas in the windbox And a pallet position recognizing device for the sintering machine for detecting the position of the sintering machine in the longitudinal direction of each of the pallets that circulate in the sintering machine. RFID tags that can be written and read identification information and fixed to the casing of the sintering machine, facing each series of pallets facing the series of pallets. An antenna installed at a position where radio waves can be transmitted to and received from the RFID tag installed on the antenna for a predetermined time, and writing of a signal including identification information of each RFID tag connected to the antenna The reader / writer of the RFID tag that can be read and the identification information of the RFID tag input from the reader / writer are used to identify the pallet that passes through the antenna position and detect the position of the pallet A signal processing unit for recognizing and a speed detector for detecting a moving speed of each pallet, and the reader / writer of the RFID tag sends a probe signal for requesting the identification information to the RFID tag via an antenna. Transmitting in a time period, obtaining identification information from the received wave returned from the RFID tag, and sending the identification information to the signal processing unit as an identification signal The signal processing unit outputs the number of each pallet and the position in the longitudinal direction of the sintering machine based on the identification signal input at the predetermined time period and the moving speed of the pallet input from the speed detector. Is derived using information on the arrangement state of the series of pallets set in advance .

  Further, in the pallet position recognition device of the sintering machine of the present invention, the reader / writer of the RFID tag transmits a probe signal requesting the identification information to the RFID tag at a predetermined time period via the antenna, and the RFID tag The identification information is obtained from the received wave returned from the signal, and the identification information is output as an identification signal to the signal processing unit. The signal processing unit is configured to output each pallet based on the identification signal input at the predetermined time period. And the position in the longitudinal direction of the sintering machine are derived using information on the arrangement state of the series of pallets set in advance.

  Furthermore, the pallet position recognition device for a sintering machine of the present invention includes a speed detector for detecting the moving speed of each pallet, and the signal processing unit is configured to input the moving speed of the pallet input from the speed detector, and Based on the information on the arrangement state of the series of pallets, the number of each pallet and the position in the longitudinal direction of the sintering machine are derived.

  An air leakage detection device for a sintering machine according to the present invention is an air leakage detection device for a sintering machine provided with the pallet position recognition device for the sintering machine, in a direction orthogonal to the longitudinal direction of the sintering machine of the wind box. A light emitter and a light receiver are disposed on the opposite walls in the width direction of the pallet, respectively, and a laser beam is emitted from the light emitter and received by the light receiver to receive oxygen in the optical path. Based on one or more laser-type oximeters for measuring the concentration and the value of the oxygen concentration in the wind box measured by the laser-type oximeter, the presence / absence and magnitude of air leakage is detected for each of the series of pallets. And a data processing device.

  According to the pallet position recognizing device of the present invention described above, the position of the pallet that circulates endlessly on the sintering machine can be recognized stably and accurately over a long period of time. . In addition, according to the air leakage detection device for a sintering machine provided with the pallet position recognition device, it is possible to detect air leakage caused by the pallet stably and accurately over a long period of time.

  Further, according to the air leakage detection using the pallet position measuring device of the present invention, the air leakage from the breakage of the great bar mounted on the bottom surface of the pallet, the air leakage from the connecting portion of the sidewall between adjacent pallets, and the pallet Leakage due to wear of the seal bar can be accurately detected, and the leaking pallet can be reliably identified. Therefore, by replacing and repairing the specified pallet having air leakage, it is possible to significantly and stably reduce the air leakage as compared with the conventional pallet. As a result, not only the power consumption of the sintered main exhaust fan can be reduced, but also the production of sintered ore can be increased due to the increase in the amount of air normally sucked through the sintering pallet.

  DESCRIPTION OF EMBODIMENTS Embodiments of a pallet position measuring device for a sintering machine according to the present invention and an air leakage detection device for a sintering machine equipped with the pallet position measuring device will be described in detail below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the part etc. which have the same function in each figure, and description of a figure is demonstrated simply and clearly.

<First Embodiment>
A schematic configuration of an embodiment of a pallet position recognition device for a sintering machine of the present invention is shown in FIGS. 1, 2, and 3. FIG. 1 shows a sintering machine 5 provided with a position recognition device according to the present invention, wherein (a) is a plan view and (b) is a side view. As shown in FIG. 1, the sintering machine 5 is provided with a series of pallets P that are connected to a plurality of pallets 1 in the longitudinal direction and movable in the longitudinal direction, and fixed below the pallets P. Air intake means including a plurality of wind boxes 2. As shown in FIG. 10, each pallet 1 is provided with wheels 10 on the outside of sidewalls 8 arranged on both sides with the great bars 7 arranged on the bottom surface with the great bars 7 arranged on the bottom surface. As shown in FIG. 1 (b), the series of pallets P are connected at the front end and the rear end, and circulate in the casing 31 of the sintering machine 5 in an endless manner. Each wind box 2 is decompressed by intake / exhaust by a blower (not shown) via an intake pipe 17. During the lap of the series of pallets P, a sintering raw material containing coke powder is supplied to each pallet 1 from the raw material supply hopper 3 and loaded. The surface of the sintered raw material layer 30 is ignited by the ignition furnace 4 and sucked through the wind box 2. 2 is a cross-sectional view taken along line AA of FIG. The pallet 1 moves on the two rails 26 fixedly provided on both sides in the casing 31 of the sintering machine 5 as the wheels 10 provided in each pallet 1 roll.

  In the present invention, as shown in FIGS. 1 and 2, one commercially available RFID tag 11 is attached to each side surface of all pallets 1 of the sintering machine 5. The mounting position of the RFID tag 11 is, for example, between the two wheels 10 and 10 adjacent to the carriage 9 below the sidewall 8 in the height direction and in the longitudinal direction of the sintering machine 5 in the traveling direction. The center is preferred. In the present embodiment, the RFID tag 11 may be a passive type. The reason for the selection is that there is no troublesome battery replacement because a power source is unnecessary. As the passive type RFID tag 11, it is preferable to use the UHF band RFID tag 11 having a long communication distance in an on-metal state because the pallet 1 to be mounted is made of steel. Each RFID tag 11 mounted on each pallet 1 holds identification information such as the pallet number in advance.

  RFID is an abbreviation for Radio Frequency Identification, and desired information is transmitted and received by a short-distance wireless communication using radio waves or the like from a tag (a tag made of an IC chip) in which ID information recorded in a built-in memory is embedded. Say things. It is possible to read / write desired information from / to a memory in the RFID tag by using an external transmission / reception device by wireless communication.

  On the other hand, as shown in FIGS. 1 and 2, the information read / write antenna 12 that transmits and receives radio waves to and from the RFID tag 11 is read / written in a direction facing the RFID tag 11 mounted on the side surface of the pallet 1. The antenna 12 (hereinafter also referred to as “antenna”) 12 is directed to the housing 31 side of the sintering machine 5 so that the directivity is directed. The distance between the RFID tag 11 and the antenna 12 when the RFID tag 11 mounted on the pallet 1 passes just in front of the antenna 12 is about 1 m, for example. As shown in FIG. 3, the antenna 12 is connected to the signal processing unit 14 via the signal line RF18 and the reader / writer 13 that executes writing and reading of information to and from the RFID tag 11. When the pallet 1 on which the RFID tag 11 is installed passes near the front of the antenna 12, the signal processing unit 14 determines the number of the pallet 1 based on, for example, the number signal of the RFID tag 11 read by the reader / writer 13. recognize. In the present embodiment, the RFID tag number is determined so that the RFID tag number is the same as the pallet number, and the effort of matching both numbers is saved.

  The configuration of the pallet position recognition device 32 shown in FIG. 3 will be described in detail. In the present embodiment, for example, a probe signal for requesting an identification signal based on the identification information of the RFID tag 11 from the reader / writer 13 is output to the antenna 12 at a cycle of 1 second, and the probe signal is output from the antenna 12. Transmit the transmitted wave. After this transmission wave is received by the RFID tag 11, the transmission wave returned from the RFID tag 11 as a response signal is received by the antenna 12. A reception signal is input from the antenna 12 to the reader / writer 13. Next, an identification signal such as a number is 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 information included in the identification signal. Further, the RFID input unit 19 associates the identification signal such as the pallet number with the input time and stores it in the built-in memory. At this time, it is preferable to add the order of signals input from the reader / writer 13 to each identification signal to be stored, which is useful in subsequent signal processing. The signal processing unit 14 has a built-in clock function unit (not shown). In the present embodiment, the moving speed (pallet speed) of the pallet 1 in the operating state of the sintering machine 5 is about 2500 cm / min. At this time, the number of readings per pallet is about 10 to 14 times. In this case, when converted from the transmission / reception period (1 second) and the pallet speed, the RFID tag 11 is about 20 to 30 (2500 / (10 to 14)) cm from the center of the antenna 12 to the left and right (that is, the longitudinal direction of the sintering machine). The RFID tag 11 in the movement range is read. Since the length of each pallet 1 in the longitudinal direction is usually 1.5 m, it is determined that the RFID tag 11 attached to the adjacent pallet 1 is not erroneously read. Note that the functions for measurement included in each unit included in the reader / writer 13, the RFID input unit 19, and the signal processing unit 14 described below are executed based on control by the measurement control unit 24.

  As described above, when signals are transmitted and received between the RFID tag 11 and the antenna 12, it is necessary to prevent signals from adjacent RFID tags 11 from being superimposed. Therefore, the interval L between the adjacent RFID tags 11 has a minimum value L0 that can be installed. The minimum interval L0 is determined by the directivity for transmitting and receiving radio waves of the antenna 12 and the RFID tag 11 and the shortest interval between the antenna 12 and the moving RFID tag 11. Then, the interval L between the RFID tags 11 and the interval between the antenna 12 and the series of pallets P may be appropriately determined within a range where (interval L> minimum interval L0).

  In the present embodiment, when the pallet 1 passes in front of the antenna 12, the number of readings per installed RFID tag 11 is 10 times or more as described above. Will never be skipped without reading.

  Furthermore, in the present embodiment, in order to measure the moving speed (pallet speed) of the pallet 1 in the casing 31 of the sintering machine 5, a speed detector 15 composed of, for example, PLG is installed (see FIG. 3). ). Then, for example, a pulse signal output from the PLG is input to the speed signal input unit 20 of the signal processing unit 14 as shown in FIG. When the identification signal including the pallet number is skipped due to a failure of the RFID tag 11 or the like, it is detected that the pallet number is not input at the timing calculated from the pallet speed output from the speed detector 15. Furthermore, based on the pallet numbers of the RFID tags 11 before and after the RFID tag 11, the pallet number of the defective RFID tag 11 skipped can be specified. For example, if the number of the RFID tag 11 mounted on the pallet 1 after the defective RFID tag 11 is read, the arrangement order of the pallet numbers is stored in the signal processing unit 14 in advance, so that one RFID tag 11 is stored. It is possible to interpolate the number even if it is skipped. In the present embodiment, the speed detector 15 is used as described above, and the pallet speed is captured in parallel with the signal processing unit 14, and the pallet speed and the number from the RFID tag 11 (that is, the pallet number) are illuminated. A misrecognition prevention unit 22 having a matching function is provided in the signal processing unit 14 to prevent misrecognition of pallet numbers such as skipping.

  Further, in the pallet position calculation unit 23 of FIG. 3, the speed detector 15 uses the pre-stored arrangement order of the pallets 1 and the arrangement order of the pallet numbers and the initial position which is the initial state of the operation of the series of pallets P. Based on the pallet speed, the position of each pallet 1 in the longitudinal direction of the sintering machine 5 is recognized. For example, a series of pallets P is composed of 100 pallets, and each pallet 1 is numbered from 1 to 100 in order. As an initial state of operation, it is assumed that the front end of the first pallet is at the reference position on the entry side (raw material supply hopper 3 side) of the sintering machine 5 at a certain time T0. Based on the information on the arrangement state of the series of pallets P described above, when the position recognition by the RFID tag 11 mounted on the pallet 1 is performed at a certain time Tm, the speed detection value Vm and time by the speed detector 15 are determined. From (Tm−T0), the travel distance Lm (Lm = Vm × (Tm−T0)) in the sintering machine 5 of the pallet can be calculated, and the travel distance Lm and the distance between the first pallet and the pallet From this, the position of the pallet 1 with respect to the reference position can be derived. Based on the identification signal input from the RFID tag 11 attached to the pallet 1 and the calculated position, the difference in the derived value between the position of the pallet 1 derived by the process described below is more than 10 cm. In this case, the present embodiment employs a method of correcting the position of the pallet 1 with the position measurement value based on the identification signal from the RFID tag 11 being positive. Instead of the above reference position, the center of the installation position of the antenna 12 in the longitudinal direction of the sintering machine 5 may be used as the reference position.

  The method of recognizing the position of each pallet 1 by using the pallet speed detection value Vm and the time Tm by the speed detector 15 described above is difficult to avoid slipping and backlash due to the structure of the sintering machine 5. Since it has a problem in measurement accuracy, it is not preferable as a stable and accurate pallet position recognition method. For example, if the error accumulates and shifts by one pallet (1.5 m), a problem similar to the method described in Patent Document 1 will occur. For this purpose, the pallet position recognition method of the present invention that 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 according to the present embodiment, an example of a pallet position recognition process executed by the signal processing unit 14 based on the identification signal is obtained from each pallet 1 and an identification signal consisting of a number or the like is obtained. This will be described below with reference to FIG.

S100: Identification Data Acquisition Processing First, based on a probe signal for requesting an identification signal output from the reader / writer 13 under the control of the RFID input unit 19, the antenna 12 has a fixed period ΔT from the pallet 1 side. At a transmission (or reception) time Tm (m = 0, 1, 2,...), For example, a probe signal transmission wave is transmitted at intervals of 1 second. Next, the received wave as a response from the RFID tag 11 with respect to the transmitted wave of the probe signal transmitted from the antenna 12 is received by the antenna 12 at a constant period ΔT and transmitted to the reader / writer 13. The reader / writer 13 detects a response signal including identification information such as a pallet number from the received wave signal, 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, no response signal is output from the reader / writer 13, and no response signal including identification information is input to the RFID input unit 19. At this time, a NULL signal that does not include identification information is input to the RFID input unit 19 at a constant period ΔT. The RFID input unit 19 associates an identification signal such as a pallet number from the input response signal or a non-detection signal (for example, “NULL”) from the NULL signal with the transmission time signal Tm to identify data Dm. Are sequentially recorded in a built-in memory. At this time, it is preferable to add a serial number N to each set of the transmission time signal Tm and the identification signal. Further, the identification data Dm is sequentially input to the erroneous recognition prevention unit 22 and the pallet position calculation unit 23. The above processing may be executed in synchronization with a time signal (timing signal) output from a clock function unit built in the measurement control unit 24.

S101: Pallet passing detection process In the RFID input unit 19, when the above "NULL" is continuously input a predetermined number of times, for example, three times, it is assumed that one pallet (installed RFID tag) has passed. Then, a pallet passing signal Vps is created. Next, the RFID input unit 19 sequentially inputs the pallet passing signal Vps to the erroneous recognition preventing unit 22. Further, the pallet passage signal Vps may also be input to the pallet position calculation unit 23. The above processing may be executed in synchronization with a time signal (timing signal) output from a clock function unit built in the measurement control unit 24.

S102: Pallet position calculation process The pallet position calculation unit 23 uses the identification data Dm from the RFID tag of one pallet based on the continuous identification data Dm sequentially input from the RFID input unit 19, for example, first Two intermediate times are obtained from the received time and the last received time, and it is recognized that the center in the longitudinal direction of the line of the pallet 1 on which the RFID tag 11 is mounted is located in front of the antenna 12 at that time. In this process, the pallet passing signal Vps may be used as a trigger signal or the like.

S103: Pallet Position Error Calculation Processing On the other hand, the pallet position calculation unit 23 inputs the speed detection value Vm from the speed detector 15 to the speed signal input unit 20, and the speed detection value Vm and the time from the start of measurement (Tm−T0). ), The travel distance Lm (Lm = Vm × (Tm−T0)) in the sintering machine of the first pallet (the top of a series of pallets) can be calculated, and the travel distance Lm, the first pallet and each pallet The position of each pallet with respect to the reference position is calculated from the distance. The error between the pallet position calculated from the pallet speed in this way and the pallet position recognized in S102 is calculated. If the error is less than ± Xcm, the pallet position calculated from the pallet speed is corrected. Output as. If the error is within the allowable range ± Xcm, the position of each pallet on the sintering machine calculated from the pallet speed is corrected by the error, with the pallet position recognized in S102 being positive. In the present embodiment, for example, X = 10 cm, but is set as appropriate based on desired position detection accuracy.

S104: Pallet number misrecognition process The misrecognition prevention unit compares the measured value of the pallet position derived in S103 based on the measured value of the pallet speed by the speed detector 15 with the identification data Dm obtained in S100. Then, a process of preventing erroneous recognition when deriving a pallet number based on the pallet speed due to skipping of a response signal due to a transmission / reception error between the RFID tag and the reader / writer 13 is executed. The misrecognition process may be used when derivation of the pallet number based on the pallet speed by the speed detector 15 is used as a main position detection means. When the response signal from the RFID tag is used as the main position detecting means, it is not always necessary to use it.

S105: Result Output and Recording Process The calculation result and the derivation result obtained in each of the above processes are output to a computer display or the like or a recording device for presentation to the operator or the like by the output unit 25.

  Although the accuracy of position recognition of the pallet 1 has been improved by the above-described processing, the reading status may be slightly changed depending on the orientation of the RFID tag 11, the orientation of the antenna 12, and the height positional relationship between the two. Test revealed. Therefore, when implementing the present invention, it is advisable to pay close attention to the directivity and arrangement of each device when installing the RFID tag 11 and the antenna 12.

  As described above, the signal processing unit 14 includes the RFID input unit 19, the speed signal input unit 20, the pallet number misrecognition prevention unit 22, the pallet position calculation unit 23, the measurement control unit 24, and the output unit 25. (See FIG. 3). The signal processing unit 14 can be configured by a computer system. The computer system may be configured by a CPU, a main storage device, an external storage device such as an HDD, an input device such as a keyboard and a mouse, and a computer display. Also, a computer program for causing the computer system to execute a series of processes for recognizing the pallet position described in S100 to S105 is created, loaded into the main storage device, and executed to thereby execute the sintering machine of the present invention. The pallet position recognition apparatus can be realized.

<Second Embodiment>
An embodiment of a pallet air leakage detecting device according to a second invention of the present application will be described in detail with reference to FIGS. The air leakage detection device in the present embodiment includes the pallet position recognition device of the first invention exemplified above. In the drawings of the following description, the same reference numerals are given to the devices / parts having the same functions as those in the above drawings to avoid the complexity of the drawings.

  FIG. 5 shows the sintering machine 5 provided with the air leakage detection device according to the present invention, wherein (a) is a plan view and (b) is a side view. As shown in FIG. 5, the sintering machine 5 is provided with a plurality of pallets 1 connected in the longitudinal direction, a series of pallets P movable in the longitudinal direction, and fixed below the series of pallets P. Air intake means including a plurality of wind boxes 2. As shown in FIG. 10, each pallet 1 is provided with wheels 10 on the outside of sidewalls 8 arranged on both sides with the great bars 7 arranged on the bottom surface with the great bars 7 arranged on the bottom surface. As shown in FIG. 5 (b), a series of pallets P have their front ends and rear ends connected to each other and circulate in the casing 31 of the sintering machine 5 in an endless manner. Each window box 2 is depressurized by a blower (not shown) through an intake pipe 17. During a series of pallets P, a sintering raw material layer 30 is formed by supplying a sintering raw material containing coke powder from the raw material supply hopper 3 to each pallet 1. The surface of the sintered raw material layer 30 is ignited by the ignition furnace 4 and sucked through the wind box 2. 6 is a cross-sectional view taken along line BB in FIG. Moreover, the cross-sectional view seen from the AA line of FIG. 5 is the same as that of FIG. As described above, this embodiment includes the pallet position recognition device 32 described in the first embodiment. Further, the pallet 1 moves on the two rails 26 fixedly provided on both sides in the casing 31 of the sintering machine 5 as the wheels 10 provided on the side surfaces of the pallets 1 roll. In the following description of the present embodiment, the description of the pallet position recognition device 32 is the same as that of the first embodiment, and will be omitted.

  In the present embodiment, as shown in FIGS. 5 and 6, in the line longitudinal direction of the sintering machine 5 (moving direction of the pallet 1), on the uppermost part of the side wall 2 a of the wind box 2 located immediately below the pallet 1. In order to detect the fluctuation of the oxygen concentration in the wind box 2 facing the width direction of the pallet 1, for example, it is described in Non-Patent Document 1 (Kurimoto Technical Report No. 56, pages 17-18). A light emitter 16a that emits laser light and a light receiver 16b that detects the laser light of the laser type oxygen oximeter 16 are installed. The reason for installing the windbox 2 on the side wall 2a is that the air leaked from the pallet 1 into the windbox 2 diffuses as it is drawn downward toward the intake pipe 17, so that the oxygen concentration is measured. This is because it is preferable that the pallet 1 is as close to the pallet 1 as possible in order to identify the location of the air leakage of the pallet 1. At this time, the optical axis 16c of the laser beam parallel to the direction connecting the light emitter 16a and the light receiver 16b is horizontal with respect to the ground and parallel to the bottom surface of the pallet 1 in order to make the air leak detection sensitivity in the width direction of the pallet 1 uniform. It is good to become. In order to easily identify the pallet 1 that is leaking, the light emitter 16 a and the light receiver 16 b are installed so that the optical axis 16 c is perpendicular to the line longitudinal direction of the sintering machine 5.

  FIG. 7 shows the configuration of the air leak detection device 33 of the present embodiment. The air leakage detection device 33 includes the pallet position recognition device 32 shown in FIG. As shown in FIG. 7, the laser oximeter 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. . Further, the laser type oxygen concentration meter 16 is connected to a data processing device 41 that detects the presence or absence and magnitude of air leakage for each pallet based on the measured value of the oxygen concentration. The data processing device 41 is composed of, for example, a personal computer.

  In this embodiment, as shown in FIG. 6 and FIG. 8 (partially enlarged view), the rail 26 penetrates the frame 26a on both sides where the wheel 10 of the pallet 1 rolls and the opposite side of the side wall 2a of the wind box 2 respectively. A hole is provided, and a purge pipe 27 is passed through each of the through holes. A light emitter 16 a is connected to the end of one purge pipe 27 and a light receiver 16 b is connected to the end of the other purge pipe 27 via a flange 28. A protective sealing glass window 29 is provided in each light path at the light emitting port of the light emitter 16a and the light receiving port of the light receiver 16b. For the purpose of preventing the sealing glass window 29 from being contaminated and preventing the purge pipe 27 from being clogged with dust in the exhaust gas, the purge pipe 27 includes the light emitting device 16a and the light receiving device 16b in the wind box 2 from the sealing glass window 29. Then, nitrogen gas is blown as a purge gas. However, the flow rate of nitrogen gas is such that the composition of the exhaust gas is not significantly affected by the nitrogen gas that is blown. The purge gas may be a gas other than nitrogen gas that does not interfere with the oxygen concentration measurement.

  The oxygen concentration in the exhaust gas in each wind box 2 of the sintering machine 5 at normal time with no air leakage is the supply side of the sintering raw material in the longitudinal direction of the sintering machine 5 shown in FIG. It is close to 17-20% on the side supply side) and gradually decreases to 10% or less as it reaches the middle part in the longitudinal direction, and rises again on the discharge side (lower side of pallet movement), close to 21% become. This is because the calcination reaction is still only near the surface (upper side) of the combustion raw material layer 30 on the supply side, so that unreacted oxygen reaches the wind box 2 as it is, and the calcination reaction becomes full-scale in the middle part. It is considered that unreacted oxygen decreases and the oxygen concentration rises again because the firing reaction itself is completed on the exhaust side.

  Therefore, since the air leak is air and the oxygen concentration is 21%, the position where the difference between the normal state where there is no air leak due to deterioration of the pallet 1 and the abnormal state where the air leak is likely to occur, that is, the oxygen concentration is low. It is preferable to install a laser oximeter 16 in the middle part of the stable longitudinal direction of the sintering machine 5. However, if the installation space cannot be installed in the middle due to the installation space, it is possible to detect the air leakage by selecting and installing a place where the oxygen concentration is high and stable as much as possible.

  Furthermore, since the ambient temperature of the windbox 2 increases as it approaches the discharge side, the heat resistance and maintainability of the light emitter 16a and the light receiver 16b of the laser oximeter 16 are increased to the feed side in the middle part. It is good to install in the near side. Further, the dust in the exhaust gas in the wind box 2 is also less on the supply side, and the influence of the attenuation of the laser beam due to the dust and the clogging of the purge pipe 27 are less advantageous.

  As an example, in the above-described embodiment, the laser oximeter 16 is installed in the seventh wind box 2 from the supply side among all 26 wind boxes 2. The oxygen concentration in the normal operation state at this installation position is around 7%, but this value rose to 8-9% when passing through the pallet 1 with air leakage. Therefore, in this case, an alarm is output when the oxygen concentration is 8% or more, and the air leak is notified to the operation operator.

  The laser beam diameter of the laser oximeter 16 used here is sufficiently small, about 20 mmΦ, and has a response of about 3 seconds. By attaching a position measuring device in the line longitudinal direction of each pallet 1 to the sintering machine 5 and measuring the position of each pallet 1, and using the oxygen concentration measurement value obtained by the laser oximeter 16, a series of pallets P Of these, not only the pallet 1 that is leaking air can be specified, but also the air leakage position in the traveling direction in the specified pallet 1 can be specified. In that case, the data of the pallet position and the oxygen concentration data are taken into the data processing device 41 configured by using a personal computer or the like through the I / O board, and the air leakage is detected from the abnormal oxygen concentration, You may make it display on a computer display with the name of the pallet in which the air leak has occurred.

  In the above description, the configuration using one laser-type oximeter has been described. However, it is obvious that the air leakage detection device may be configured using a plurality of units.

  As described above, according to the pallet air leakage detection device 33 of the sintering machine that is the second embodiment of the present invention, the oxygen concentration in the wind box is highly sensitive using the laser type oxygen concentration meter 16. It is possible to detect with high sensitivity the air leakage in the pallet that is measured and passes through the installation positions of the light emitter 16a and the light receiver 16b of the laser oximeter 16. Further, since the pallet position recognition device 32 described in the first embodiment is provided, the number of the pallet passing through the installation positions of the light emitter 16a and the light receiver 16b of the laser oximeter 16 is specified. In addition, the position of the air leakage in the longitudinal direction of the sintering machine in the pallet can be specified with high accuracy.

  Further, in the first embodiment and the second embodiment, since the RFID tag 11 used can also write information to the tag, the RFID tag 11 is passed every time the RFID tag 11 passes in front of the antenna 12. The operation number n written to the RFID tag 11 together with the number 11 is read, and the counted number n + 1 is written to the RFID tag 11 under control of the signal processing unit 14, for example. As a result, since the number of operations of each pallet 1 on-line of the sintering machine 5 is known, this is an effective means for determining the maintenance order of the pallets 1. In addition, the signal processing unit 14 is connected to a host computer for managing the operation of the sintering machine via a network, or the signal processing unit 14 is provided with an input / output unit for workers, so that maintenance information such as repair history is provided. Can also be used as a tool for operation management, trouble prevention, and equipment maintenance.

  The pallet air leak detector 33 of the sintering machine described in the second embodiment uses a method of measuring the oxygen concentration in the wind box 2 with a laser oximeter as the air leak detector. It is obvious that other known air leakage detection methods can be adopted instead.

  In the above, as an example of detecting the air leakage caused by the pallet in the sintering process for producing the sintered ore in the blast furnace iron making, which is the upper process of the steel industry, the pallet position recognition device of the present invention and the air leakage detection using the device Although the apparatus has been described in detail, the pallet position recognition apparatus and the air leakage detection apparatus of the present invention can detect the position of a moving apparatus, the inflow of gas from the apparatus, etc. in other processes in the steel industry, similar processes in other industries, etc. It is clear that it can be applied to detection.

The sintering machine provided with the pallet position recognition apparatus of this invention is shown, (a) is a top view, (b) is a side view. It is sectional drawing seen from the AA line of FIG. It is a block diagram which shows the system structure outline of the pallet position recognition apparatus of this invention. It is a measurement process flowchart of the pallet position recognition apparatus of this invention. The sintering machine provided with the pallet position recognition apparatus and the air leak detection apparatus of this invention is shown, (a) is a top view, (b) is a side view. It is sectional drawing seen from the BB line of FIG. It is a block diagram which shows the system configuration | structure outline of the air leak detection apparatus of this invention. It is an enlarged view of the laser-type oxygen concentration meter part of FIG. The conventional sintering machine is shown, (a) is a top view, (b) is a side view. It is a perspective view of a pallet. It is sectional drawing seen from the CC line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pallet 2 Wind box 2a Side wall 3 Raw material supply hopper 4 Ignition furnace 5 Sintering machine 6 Pallet seal bar 7 Great bar 8 Side wall 9 Bogie 10 Wheel 11 RFID tag 12 Antenna 13 Reader / writer 14 Signal processor 15 Speed detector 16 Laser type oxygen concentration meter 16a Light emitter 16b Light receiver 16c Optical axis 17 Intake pipe 18 Signal line RF
19 RFID input section 20 Speed signal input section 21 Oxygen concentration signal input section 22 False recognition prevention section 23 Pallet position calculation section 24 Measurement control section 25 Output section 26 Rail 27 Purge pipe 28 Flange 29 Seal glass window 30 Sintered raw material layer 31 Housing Body 32 Pallet position recognition device 33 Air leakage detection device 41 Data processing device

Claims (2)

A plurality of movable pallets loaded with sintering raw materials are connected in the moving direction, and a series of endless pallets in which the front end and rear end are connected, In the air leakage detection device for a sintering machine, comprising a plurality of window boxes disposed below and an intake pipe connected to the lower ends of each of the plurality of window boxes to exhaust the gas in the window box. A pallet position recognition device for a sintering machine that detects the position of the sintering machine in the longitudinal direction of each pallet that circulates in the binding machine,
RFID tags installed on the outside of the respective sidewalls of the pallets and capable of writing and reading identification information;
Fixed to the casing of the sintering machine, facing the series of pallets, installed at a position where radio waves can be transmitted and received for a predetermined time with the RFID tag installed on each pallet that circulates. Antenna
An RFID tag reader / writer connected to the antenna and capable of writing and reading a signal including identification information of each RFID tag;
A signal processing unit that identifies a pallet that passes through the position of the antenna based on identification information of the RFID tag input from the reader / writer, and detects and recognizes the position of the pallet ;
A speed detector for detecting the moving speed of each pallet;
The reader / writer of the RFID tag transmits a probe signal requesting the identification information to the RFID tag at a predetermined time period via an antenna, obtains the identification information from a received wave returned from the RFID tag, and performs the identification. Output information to the signal processing unit as an identification signal,
The signal processing unit presets the number of each pallet and the position in the longitudinal direction of the sintering machine based on the identification signal input at the predetermined time period and the moving speed of the pallet input from the speed detector. A pallet position recognition apparatus for a sintering machine, wherein the pallet position recognition apparatus is derived using information on the arrangement state of the series of pallets . An air leakage detection device for a sintering machine comprising the pallet position recognition device for a sintering machine according to claim 1,
A light emitter and a light receiver are respectively disposed opposite to the width direction of the pallet on the upper portion of the wall facing the direction perpendicular to the longitudinal direction of the sintering machine of the wind box, and laser light is emitted from the light emitter. One or more laser-type oximeters that measure the oxygen concentration in the optical path by
A sintering machine comprising a data processing device for detecting the presence or absence and magnitude of air leakage for each of the series of pallets based on the value of oxygen concentration in the wind box measured by the laser oximeter Air leak detection device.

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