CN113564288A - Control method for lower vibrating screen of blast furnace trough - Google Patents
Control method for lower vibrating screen of blast furnace trough Download PDFInfo
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- CN113564288A CN113564288A CN202110853984.8A CN202110853984A CN113564288A CN 113564288 A CN113564288 A CN 113564288A CN 202110853984 A CN202110853984 A CN 202110853984A CN 113564288 A CN113564288 A CN 113564288A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Weight Measurement For Supplying Or Discharging Of Specified Amounts Of Material (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
A control method of a lower vibrating screen of a blast furnace groove comprises the following steps: a. a frequency converter is arranged in front of the vibration motor; b. measuring the feeding speed of the power frequency screen, and recording the low-speed working frequency f of the frequency converter1(ii) a c. Controlling the vibrating screen to work according to the following method: firstly, setting a weight value and a vibration stopping lead of a weighing hopper; recording the initial weight value of the weighing hopper and starting a power frequency running timer; thirdly, setting the frequency of the frequency converter to be 50Hz, and calculating the average speed of the charging materials screened by the vibrating screen in real time; fourthly, recording the high-speed screening speed and setting the frequency of the frequency converter to be f1(ii) a Recording the low-speed running time as a vibration stopping weight value, and stopping the vibration sieve; sixthly, updating the vibration stopping lead. The invention controls the vibrating screen under the blast furnace groove in sections on the basis of fully considering the screening speed, the residual vibration amount after the vibrating screen stops working and other factors, thereby not only leading the screen to be screenedThe speed division can meet the requirement of production rhythm, the accuracy of weighing the charged materials is greatly improved, and the smooth operation of blast furnace smelting can be ensured.
Description
Technical Field
The invention relates to a control method of a blast furnace chute lower vibrating screen, which can effectively improve the weighing accuracy of furnace charge put into the blast furnace chute and belongs to the technical field of control.
Background
In the blast furnace smelting process, the charged materials such as coke, sintered ore and the like need to be screened and weighed, the weight which is the same as the set value is obtained as far as possible, and the strict proportioning requirement of the charged materials of the blast furnace is met, but because the traditional vibration sieve control mode is simpler, the residual vibration quantity after the vibration sieve stops working is not controlled, and the like, the screened charged material weight has larger deviation compared with the set value frequently, so that the proportioning of the charged materials is inaccurate, the production stability of the blast furnace is seriously influenced, particularly when the weighing system has faults or is overhauled and stopped, the proportioning accuracy of the charged materials is lower, and the blast furnace air reduction and damping accidents are easily caused, therefore, a novel control method of the vibration sieve under the blast furnace trough is developed, and the problem of low accuracy of the charged material weighing is very necessary.
Disclosure of Invention
The invention aims to provide a method for controlling a vibrating screen under a blast furnace tank, aiming at overcoming the defects of the prior art, so as to improve the weighing accuracy of charged materials and ensure the smooth operation of blast furnace smelting.
The problems of the invention are solved by the following technical scheme:
a method for controlling a vibrating screen under a blast furnace groove comprises the following steps:
a. the front part of a vibration motor of the vibrating screen is provided with a frequency converter, the frequency converter is connected to an automatic control system through a cable, and the automatic control system controls the working frequency of the vibration motor by changing the working frequency of the frequency converter; the weight signal output by the weighing sensor of the weighing hopper is converted by the weighing transmitter and then sent to the automatic control system to realize the weighing of the weighing hopper; simultaneously, three timers are arranged in the automatic control system, and the timers are respectively as follows: the automatic control system comprises a power frequency running timer, a low-speed running timer and a residual vibration timer, wherein the automatic control system is connected with an upper computer through a communication cable;
b. the working frequency of the frequency converter is adjusted to 50Hz, and the feeding speed S of the power frequency sieve of the vibrating sieve is adjusted50Measuring (kilogram/second), then gradually reducing the working frequency of the frequency converter, measuring the speed of the screened charging material at each working frequency, and recording the low-speed working frequency f of the frequency converter at the moment when the speed of the screened charging material of the vibrating screen is reduced to a set low-speed value1(Hz)；
c. Under the condition that the weighing system normally operates, the vibrating screen is controlled to work according to the following method:
firstly, a weighing hopper is arranged by an upper computer to set a weight value WS(kilogram) and lead W of vibration stoppingT(kg);
secondly, the automatic control system sends a signal for starting the vibrating screen according to the production requirement and records the initial weight value W of the weighing hopper output by the weighing sensor0(kg) and starting a power frequency running timer T0;
thirdly, setting the frequency of the frequency converter to be 50Hz according to the following formulaCalculating average speed S of charging materials sieved by a vibrating sieve in time1(kg/sec):
wherein W1Current weight value (kg) of weighing hopper, W, output by weighing sensor0For weighing the initial weight value (kg) of the hopper, t0The timing time (second) of a power frequency running timer T0;
when WS-W1<tLS·S1+WTWhen t isLSTo set the run time of the early downshift, the current S is set1The value is recorded as the high screening speed SH(kg/sec) while the autonomous system sets the frequency of the frequency converter to f1(Hz), and starts a low-speed running timer T1;
when WS-W1<WTRecording the time value counted by the current low-speed running timer T1 as the low-speed running time TL(second), weighing the current weight value W of the hopper1(kilogram) is recorded as the weight value W of the oscillation stop2Simultaneously stopping the vibration sieve from working, and starting a residual vibration timer T2;
when the residual vibration timer T2 times to the set residual vibration time, the residual vibration quantity is calculated as W1-W2And will lead the oscillation stop to an advanced amount WTThe value of (kilogram) is updated to the value of residual vibration quantity, the automatic control system sends out a vibration sieve work completion signal to stop the vibration sieve from running, reset the power frequency running timer T0, the low speed running timer T1 and the residual vibration timer T2 and stop calculating S1；
Seventhly, when the vibrating screen is started again after the weighing hopper finishes discharging, repeating the step (II) to the step (III), and updating the numerical value generated in the last vibrating screen working process, including the high-speed screening speed SH(kg/sec), low speed run time tL(second) and lead of oscillation stop WT(kg).
The control method of the vibrating screen under the blast furnace trough aims to ensure that the proportioning accuracy of the fed materials can still meet the requirement when the weighing system fails or is out of service during maintenanceRequiring that at least the last 3 times of high-speed screening speed S is stored on an upper computer under the condition that the weighing system normally operatesHLow speed running time tLAnd the oscillation off advance WTWhen the weighing system breaks down or is maintained and stopped, an operator selects a non-weighing operation mode through an upper computer, and the automatic control system controls the vibrating screen to work according to the following method:
firstly, the automatic control system reads data generated in the last vibrating screen working process under the condition that the weighing system normally operates, and the data comprises a high-speed screening speed SHLow speed running time tLAnd the oscillation off advance WTAnd the data is used for controlling the vibrating screen;
secondly, calculating the current set weight value W of the weighing hopperSNext, a 50Hz high-speed operation time t of the frequency converter is requiredH：
tH＝(WS-tLS×SH-WT)/SH；
Thirdly, the automatic control system starts the vibrating screen, sets the frequency of a frequency converter to operate at 50Hz, and simultaneously starts a power frequency operation timer T0; when the power frequency running timer T0 reaches THThen, the automatic control system sets the frequency of the frequency converter to f1Simultaneously starting a low-speed running timer T1, and reaching T when the low-speed running timer T1 timesLThen, the vibrating screen stops working, an aftervibration timer T2 is started at the same time, when the timing of the aftervibration timer T2 reaches the set aftervibration time, the automatic control system sends out a vibrating screen working completion signal, and the power frequency running timer T0, the low-speed running timer T1 and the aftervibration timer T2 stop working and reset;
and fourthly, when the vibrating screen is started again after the weighing hopper finishes discharging, repeating the step III until an operator switches out a non-weighing operation mode through an upper computer.
In the method for controlling the vibrating screen under the blast furnace trough, the automatic control system reads data generated in the last vibrating screen working process under the condition that the weighing system normally operates, and before the data is used for controlling the vibrating screen, the data is compared with the data generated in the previous two times, if the difference value between the data generated in the last vibrating screen working process and the data generated in the previous two times is less than or equal to the allowed maximum error, the data is directly used for controlling the vibrating screen, otherwise, the data in the last time is manually modified according to the data in the previous two times, and the modified data is used for controlling the vibrating screen, wherein the specific method for modifying comprises the following steps: the average of the previous two data replaces the data generated during the last vibrating screen operation.
The method for controlling the vibrating screen below the blast furnace trough comprises the following steps: in the process of stable operation of the frequency converter at the set working frequency f, respectively recording the measurement starting time T of the weighing sensorSOutput weight signal GSAnd a measurement termination time TEOutput weight signal GEWhen the working frequency of the frequency converter is f, the screening and charging speed S of the vibrating screenfComprises the following steps:
in the method for controlling the vibrating screen below the blast furnace trough, the set low speed value of the screening charging speed of the vibrating screen is S 501/3 of (1).
In the control method of the vibrating screen under the blast furnace trough, the operation time t of reducing the speed in advance is setLSIt was 15 seconds.
According to the control method of the vibrating screen under the blast furnace groove, the set residual vibration time is 10 seconds.
According to the invention, on the basis of fully considering the screening speed, the residual vibration amount after the vibration screen stops working and other factors, the vibration screen below the blast furnace groove is controlled in a segmented manner, so that the screening speed can meet the requirement of production rhythm, the accuracy of furnace charge weighing is greatly improved, and the smooth operation of blast furnace smelting can be ensured.
Meanwhile, the vibrating screen records data for a non-weighing operation mode in the normal working process, when the weighing system breaks down or is out of service for maintenance, the vibrating screen can be manually switched to the non-weighing operation mode to work, the operation mode can ensure the proportioning precision of the charging materials, the accidents of wind reduction and damping down of the blast furnace are avoided, and the vibrating screen provides favorable support for the stable and smooth running of the blast furnace.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of the operation of a vibrating screen and a weighing hopper;
FIG. 2 is a control schematic of the present invention;
fig. 3 is a schematic workflow diagram of the present invention.
The reference numbers in the figures are: 1. the device comprises a vibrating screen, 2, a vibrating box, 3, a weighing hopper, 4, a hopper gate, M, a vibrating motor, G, a weighing sensor, U, a weighing transmitter, B and a frequency converter.
Detailed Description
The invention provides a method for controlling a vibrating screen under a blast furnace trough, aiming at the defects of the prior art, and the method can improve the accuracy of the blast furnace charging material weighing, can still ensure the high-precision charging material proportioning when a weighing system fails, and ensures the smooth operation of blast furnace smelting.
The method comprises the following steps:
a. referring to fig. 1 and 2, the invention adds a frequency converter B to a vibration motor M of a vibrating screen 1, the frequency converter B is connected to an automatic control system through a cable to realize control regulation and feedback of the working frequency of the vibrating screen vibration motor, a weighing sensor G sends a weight signal to the automatic control system after being converted by a weighing transmitter U to realize weighing of a weighing hopper 3, and meanwhile, three timers are arranged in the automatic control system, respectively: a power frequency running timer T0, a low-speed running timer T1 and a residual oscillation timer T2;
b. when the working frequency of the frequency converter is 50Hz, the feeding speed S of the power frequency screening of the vibrating screen is measured50(kilogram/second), then gradually reducing the working frequency of the frequency converter, and when the speed of the vibrating screen for screening the furnace charge is reduced to S50About 1/3, recording the low-speed working frequency f of the frequency converter at the moment1(Hz)；
c. Referring to fig. 3, in the case of normal operation of the weighing system, the vibrating screen is controlled to work according to the following method:
firstly, a weighing hopper is arranged by an upper computer to set a weight value WS(kilogram) and lead W of vibration stoppingT(kg);
secondly, the automatic control system sends out a signal for starting the vibrating screen according to the production requirement and simultaneously records the initial weight value W of the weighing hopper0(kg) and starting a power frequency running timer T0;
thirdly, setting the frequency of the frequency converter to be 50Hz, and calculating the average speed S of the charging materials screened by the vibrating screen in real time according to the following formula1(kg/sec):
wherein W1For weighing the current weight value (kg) of the hopper, W0For weighing the initial weight value (kg) of the hopper, t0The timing time (second) of a power frequency running timer T0;
when the weight value W of the weighing hopper is setS(kilogram) -weighing hopper current weight value W1(kilogram)<15S1+ oscillation stop advance WTThen, will present S1The value is recorded as the high screening speed SH(kg/sec) while the autonomous system sets the frequency of the frequency converter to f1(Hz), and starts a low-speed running timer T1;
fifthly, when the weight value W of the weighing hopper is setS(kilogram) -weighing hopper current weight value W1(kilogram)<Vibration stopping advance WTRecording the time value counted by the current low-speed running timer T1 as the low-speed running time TL(second), weighing the current weight value W of the hopper1(kilogram) is recorded as the weight value W of the oscillation stop2Simultaneously stopping the vibration sieve from working, and starting a residual vibration timer T2;
sixthly, after the residual vibration timer T2 times for 10 seconds, the residual vibration quantity W is calculated1-W2And will lead the oscillation stop to an advanced amount WTThe value of (kilogram) is updated to the value of residual vibration quantity, the automatic control system sends out a vibration sieve work completion signal, the power frequency running timer T0, the low-speed running timer T1 and the residual vibration timer T2 are stopped and reset, and the calculation S is stopped1；
Seventhly, when the vibrating screen is started again after the weighing hopper finishes discharging, repeating the step IISixthly, updating the numerical value generated in the last vibration screening working process, and keeping the high-speed screening speed S for the last 3 times on the upper computerH(kg/sec), low speed run time tL(second), advance of oscillation stop WT(kg) values for future reference.
d. When the weighing system breaks down or is maintained and stopped, the vibrating screen is controlled to work according to the following method:
firstly, when the weighing system can not be used, the operator switches into the non-weighing operation mode through the upper computer picture, and the automatic control system automatically generates data (including high-speed screening speed S) according to the last vibrating screen working processHLow speed run time tLAdvance of vibration stop WT) In operation, if the difference between the last recorded data and the last recorded data is found to be large, probably because the last recorded data is distorted due to the failure of the weighing system, the last recorded data can be manually modified according to the last recorded data and the last recorded data.
Secondly, the automatic control system is according to the formula: (W)S-15×SH-WT)/SH＝tHCalculating the current set weight value W of the weighing hopperS(kilogram) low-speed operation time t of 50Hz of frequency converterH(seconds);
thirdly, the automatic control system starts the vibrating screen, sets the frequency of the frequency converter to operate at 50Hz, and simultaneously starts the power frequency operation timer T0, the power frequency operation timer T0 reaches the timing time THAfter (second), the autonomous system sets the frequency of the frequency converter to f1(Hz), simultaneously starting a low-speed running timer T1, and reaching the timing time T by the low-speed running timer T1LAnd(s), stopping the vibration sieve, starting an aftervibration timer T2, timing for 10 seconds by the aftervibration timer T2, sending a vibration sieve work completion signal by the automatic control system, and stopping and resetting the power frequency operation timer T0, the low-speed operation timer T1 and the aftervibration timer T2.
And fourthly, when the vibrating screen is started again after the weighing hopper finishes discharging, repeating the step III until an operator cuts out a non-weighing operation mode through the upper computer picture.
Under the normal production condition, the sieve that shakes firstly works in the high-speed section, carries out the quick screening, satisfies production rhythm demand, and when weighing weight was close to the setting value, the sieve that shakes gets into the operation of low-speed section, slows down the feed speed to reduce weighing error. Meanwhile, the vibrating screen records data for a non-weighing operation mode in the normal working process, once the weighing system goes wrong, the vibrating screen can be manually switched to the non-weighing operation mode to work, the two conditions are not interfered with each other, the switching is convenient, and the practical application effect is good.
The invention adjusts the speed of the vibrating screen for screening the charging material by adjusting the working frequency of the vibrating motor of the vibrating screen. When the vibrating screen works, when the set weight value of the weighing hopper is reached, the weighing error is further reduced by reducing the screening speed of the vibrating screen, and finally, the accurate metering of the weighing hopper under the blast furnace trough is realized by calculating the residual vibration amount and dynamically modifying the vibration stopping advance. When the weighing system is in fault or is out of service, the method can realize non-weighing operation, ensure the proportioning precision of the charging materials, avoid the accidents of wind reduction and damping down of the blast furnace and provide favorable support for the stable and smooth running of the blast furnace.
Claims (7)
1. A control method of a vibrating screen under a blast furnace groove is characterized by comprising the following steps:
a. the front part of a vibration motor (M) of the vibration sieve (1) is provided with a frequency converter (B), the frequency converter (B) is connected to an automatic control system through a cable, and the automatic control system controls the working frequency of the vibration motor (M) by changing the working frequency of the frequency converter (B); a weight signal output by a weighing sensor (G) of the weighing hopper is converted by a weighing transmitter (U) and then is sent into an automatic control system to realize the weighing of the weighing hopper (3); simultaneously, three timers are arranged in the automatic control system, and the timers are respectively as follows: the automatic control system comprises a power frequency running timer T0, a low-speed running timer T1 and a residual vibration timer T2, wherein the automatic control system is connected with an upper computer through a communication cable;
b. the working frequency of the frequency converter (B) is adjusted to 50Hz, and the feeding speed S of the power frequency sieve of the vibrating sieve (1) is adjusted to50Measuring, then gradually reducing the working frequency of the frequency converter and measuring the speed of the screened charge at each working frequency, and recording the change of the speed when the speed of the screened charge of the vibrating screen (1) is reduced to a set low speed valueLow speed working frequency f of frequency converter1；
c. Under the condition that the weighing system normally operates, the vibrating screen is controlled to work according to the following method:
firstly, a weighing hopper is arranged by an upper computer to set a weight value WSLead W of vibration stopT；
Secondly, the automatic control system sends a signal for starting the vibrating screen according to the production requirement and records the initial weight value W of the weighing hopper output by the weighing sensor (G)0And starting a power frequency running timer T0;
thirdly, setting the frequency of the frequency converter (B) to be 50Hz, and calculating the average speed S of the charging materials screened by the vibrating screen in real time according to the following formula1：
Wherein W1Current weight value of weighing hopper, W, output for weighing sensor (G)0To weigh the hopper starting weight value, t0The timing time of a power frequency running timer T0 is counted;
when WS-W1<tLS·S1+WTWhen t isLSTo set the run time of the early downshift, the current S is set1The value is recorded as the high screening speed SHWhile the automatic control system sets the frequency of the frequency converter to f1And starts a low-speed running timer T1;
when WS-W1<WTRecording the time value counted by the current low-speed running timer T1 as the low-speed running time TLThe current weight value W of the weighing hopper1Recorded as the weight value W of vibration2Simultaneously stopping the vibration sieve from working, and starting a residual vibration timer T2;
when the residual vibration timer T2 times to the set residual vibration time, the residual vibration quantity is calculated as W1-W2And will lead the oscillation stop to an advanced amount WTThe value of the vibration quantity is updated to the value of the residual vibration quantity, the automatic control system sends out a vibration sieve work completion signal to stop the vibration sieve from running, reset a power frequency running timer T0 and run at a low speedTimer T1, aftervibration timer T2, stop calculating S1；
Seventhly, when the vibrating screen is started again after the weighing hopper finishes discharging, repeating the step (II) to the step (III), and updating the numerical value generated in the last vibrating screen working process, including the high-speed screening speed SHLow speed running time tLAnd the oscillation off advance WT。
2. The method for controlling the lower vibrating screen of the blast furnace groove as claimed in claim 1, wherein in order to ensure that the proportioning accuracy of the fed material can still meet the requirement when the weighing system is in fault or out of service, the high-speed screening speed S for at least the last 3 times is stored on the upper computer under the condition that the weighing system is in normal operationHLow speed running time tLAnd the oscillation off advance WTWhen the weighing system breaks down or is maintained and stopped, an operator selects a non-weighing operation mode through an upper computer, and the automatic control system controls the vibrating screen to work according to the following method:
firstly, the automatic control system reads data generated in the last vibrating screen working process under the condition that the weighing system normally operates, and the data comprises a high-speed screening speed SHLow speed running time tLAnd the oscillation off advance WTAnd the data is used for controlling the vibrating screen;
secondly, calculating the current set weight value W of the weighing hopperSNext, a 50Hz high-speed operation time t of the frequency converter is requiredH：
tH＝(WS-tLS×SH-WT)/SH；
Thirdly, the automatic control system starts the vibrating screen, sets the frequency of a frequency converter to operate at 50Hz, and simultaneously starts a power frequency operation timer T0; when the power frequency running timer T0 reaches THThen, the automatic control system sets the frequency of the frequency converter to f1Simultaneously starting a low-speed running timer T1, and reaching T when the low-speed running timer T1 timesLThen, the vibrating screen stops working, the aftervibration timer T2 is started, when the aftervibration timer T2 times to the set aftervibration time, the automatic control system sends out a vibrating screen working completion signal, and the timer T0 is operated at power frequency and lowThe fast running timer T1 and the residual vibration timer T2 stop working and reset;
and fourthly, when the vibrating screen is started again after the weighing hopper finishes discharging, repeating the step III until an operator switches out a non-weighing operation mode through an upper computer.
3. The method for controlling the vibrating screen under the blast furnace trough according to claim 2, wherein the automatic control system reads data generated in the last vibrating screen working process under the condition that the weighing system normally operates, and before the data is used for controlling the vibrating screen, the data is compared with data generated in the previous two times, if the difference value between the data generated in the last vibrating screen working process and the data generated in the previous two times is smaller than or equal to the allowed maximum error, the data is directly used for controlling the vibrating screen, otherwise, the data in the last time is manually modified according to the data in the previous two times, and the modified data is used for controlling the vibrating screen, and the specific method for modifying is as follows: the average of the previous two data replaces the data generated during the last vibrating screen operation.
4. The method for controlling the vibrating screen below the blast furnace groove as claimed in any one of claims 1 to 3, wherein the method for measuring the speed of the screened charging material comprises the following steps: in the process of stable operation of the frequency converter (B) at the set working frequency f, respectively recording the measurement starting time T of the weighing sensor (G)SOutput weight signal GSAnd a measurement termination time TEOutput weight signal GEWhen the working frequency of the frequency converter (B) is f, the screening and charging speed S of the vibrating screenfComprises the following steps:
5. the method as claimed in claim 4, wherein the screening speed of the vibrating screen is set to a low valueIs S501/3 of (1).
6. The method for controlling the vibrating screen under the blast furnace trough as claimed in claim 5, wherein the setting of the operation time t of the early deceleration is carried outLSIt was 15 seconds.
7. The method for controlling the vibrating screen below the blast furnace trough as claimed in claim 6, wherein the set residual vibration time is 10 seconds.
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| JPH0873908A (en) * | 1994-09-09 | 1996-03-19 | Nkk Corp | Apparatus for controlling grain size of charging material in bell-less blast furnace |
| CN102344977A (en) * | 2011-10-11 | 2012-02-08 | 中冶南方工程技术有限公司 | Blast furnace under-groove coke weighing control system without dispersing hopper |
| CN105002320A (en) * | 2015-08-19 | 2015-10-28 | 中冶赛迪工程技术股份有限公司 | Ore and coke tank feeding system and technology capable of realizing classification below tank |
| CN111103164A (en) * | 2019-12-12 | 2020-05-05 | 北京首钢国际工程技术有限公司 | Online sampling and waste material recovery device |
| CN111921848A (en) * | 2020-08-13 | 2020-11-13 | 莆田海关综合技术服务中心 | Screening method for ore detection |
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2021
- 2021-07-28 CN CN202110853984.8A patent/CN113564288B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0873908A (en) * | 1994-09-09 | 1996-03-19 | Nkk Corp | Apparatus for controlling grain size of charging material in bell-less blast furnace |
| CN102344977A (en) * | 2011-10-11 | 2012-02-08 | 中冶南方工程技术有限公司 | Blast furnace under-groove coke weighing control system without dispersing hopper |
| CN105002320A (en) * | 2015-08-19 | 2015-10-28 | 中冶赛迪工程技术股份有限公司 | Ore and coke tank feeding system and technology capable of realizing classification below tank |
| CN111103164A (en) * | 2019-12-12 | 2020-05-05 | 北京首钢国际工程技术有限公司 | Online sampling and waste material recovery device |
| CN111921848A (en) * | 2020-08-13 | 2020-11-13 | 莆田海关综合技术服务中心 | Screening method for ore detection |
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