CN104792191A - Automatic loading control device and control method - Google Patents
Automatic loading control device and control method Download PDFInfo
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- CN104792191A CN104792191A CN201410028724.7A CN201410028724A CN104792191A CN 104792191 A CN104792191 A CN 104792191A CN 201410028724 A CN201410028724 A CN 201410028724A CN 104792191 A CN104792191 A CN 104792191A
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Abstract
The invention discloses an automatic loading control device. The automatic loading control device comprises a furnace kiln, a windlass control module, a distributor control module and a stock rod control module, wherein the stock rod control module comprises a material level stock rod, a main control unit, a field detecting unit and an output unit; a distributor comprises multiple hoppers distributed on the circumference at intervals; and the hoppers rotate to a loading position according to a control signal; the windlass control module comprises a windlass, a positioning unit, a central controller and a speed adjusting unit. The automatic loading control device performs the automatic control for the weighing, the loading, the feeding, the distribution and the material level detection of fed raw materials of the furnace kiln, can achieve better interference resistance, realizes real-time accurate material level detection, and can timely and accurately give an ultralimit warning signal, so that the yield of the furnace kiln is improved, and the safe and smooth loading of the furnace kiln is guaranteed.
Description
Technical field
The present invention relates to a kind of for stove materials loading system and method, more particularly, relate to a kind of automatic charging control device and control method.
Background technology
In iron and steel enterprise, feeding system is the indispensable part of stove, and the form of stove material loading mainly contains master winch material loading and transport tape material loading two clock.Elevator truck feed mechanism structure is tightly played, floor space is little, with more general, its workflow is: after starting the rising signals of material loading trolley, elevator Electric Machine Control material loading trolley low cruise is about 5s, the material loading trolley rate of climb uprises speed by low speed, to top precontract 5s material loading trolley speed by high speed step-down speed, material loading trolley is about 6s to the top discharge time; Return starts to start the blanking of batch mixing belt after 3s on earth, starts second period process after material is full.
Tradition stove material loading electric-control system is made up of cam controller, PLC, frequency converter and sensor.In actual motion, there are the following problems, adopt travel switch to carry out position detection when material loading, rely on cam controller controlling run, on-the-spot at dusty lime production, the dust of high concentration often causes loose contact after the junction closure of control switch and travel switch; Mechanical part operates for a long time in the presence of a harsh environment, causes machine operation partial destruction, often causes feeding cart stall to be derailed, sits the end, enters the accidents such as kiln, gently then damage equipment, affect output, heavy then cause personal wound.
In addition, though system adopts ultrasonic wave and the inner material level of radar level gauge monitoring stove can accomplish that certainty of measurement is high, dynamic response is fast, but often run into noise, voltage ripple of power network, heavy-duty motor start and stop, electromagnetic induction and the interference such as power-off, input line suddenly in actual use, cause level-sensing device out of control in program process.In order to improve material-level measure quality, need take interference protection measure on hardware, each holding wire adds Phototube Coupling, and control cabinet adds anti-interference TVS, correspondingly again adds investment.
Summary of the invention
Object of the present invention aims to provide a kind of automatic charging control device and control method, solves the unstability of stove in prior art and the problem of high investment cost.
According to the present invention, provide a kind of automatic charging control device, comprise stove, hoist engine control module, distributing device control module and stock rod control module.This stock rod control module comprises charge level trail rod, main control unit, on-site detecting unit and output unit, and this on-site detecting unit detects level signals, and be sent to main control unit, main control unit sends control signal according to level signals by output unit; Distributing device control module comprises feed location and distributing device, and this distributing device comprises and is multiplely spacedly distributed at hopper circumferentially, according to this control signal revolving hopper to this feed location; Hoist engine control module comprises hoist engine, positioning unit, central controller and speed adjustment unit, central controller reception control signal, by the original position of positioning unit location hoist engine, by the speed of speed adjustment unit adjustment hoist engine.
According to one embodiment of the invention, this on-site detecting unit comprises transmission mechanism, rotary encoder; Transmission mechanism driven rotary encoder rotates, and rotary encoder produces position code, is sent to main control unit.
According to one embodiment of the invention, this distributing device comprises 6 hoppers, and 60 degree, interval mutually, this feed location is positioned at one of them hopper place.
According to one embodiment of the invention, this stock rod control module also comprises charge level trail rod, and this charge level trail rod is the detector with weight, and be connected with this hoist engine control module, this detector stretches in stove; In stove, set the high charge level of material level and low material level, when detector attains to a high place, send high charge level signal, when reaching low level, send low level signals.
According to one embodiment of the invention, when this main control unit receives this high charge level signal, send to this hoist engine control module and stop expecting signal; When this main control unit receives this low level signals, send reinforced signal to this hoist engine control module.
According to one embodiment of the invention, this stove comprises material cup, and fed in raw material by material legendary venomous insect in the top of stove, the bottom discharge of stove.
According to one embodiment of the invention, it is characterized in that, this stove also comprises the gate that surges, the switch of this hydraulic brake gate control hopper.
According to a further aspect in the invention, a kind of automatic charging control method is also provided, comprises stove, stock rod control module, hoist engine control module and distributing device control module, it is characterized in that, comprise the following steps: step one, in stove, set high charge level and low material level; Step 2, utilizes the material level in stock rod control module detection stove, sends and stop expecting signal, send reinforced signal when low material level being detected when high charge level being detected; Step 3, when hoist engine control module receives reinforced signal, to distributing device feed in raw material, receive stop material signal time, stop to distributing device feed in raw material; Step 4, when distributing device control module receives reinforced signal, rotates its hopper and feeds in raw material, and receives when stopping material signal, stops reinforced.
According to one embodiment of the invention, this stock rod control module comprises main control unit, on-site detecting unit and output unit, and utilize this on-site detecting unit to detect material level, be sent to main control unit, main control unit sends control signal according to material level by output unit; This distributing device control module comprises a feed location and is multiplely spacedly distributed at hopper circumferentially, according to this control signal revolving hopper to this feed location; This hoist engine control module comprises hoist engine, positioning unit, central controller and speed adjustment unit, central controller reception control signal, by the original position of positioning unit location hoist engine, by the speed of speed adjustment unit adjustment hoist engine.
According to one embodiment of the invention, this on-site detecting unit comprises transmission mechanism, rotary encoder; Transmission mechanism driven rotary encoder rotates, and rotary encoder produces position code, is sent to main control unit.
Have employed technical scheme of the present invention, the weighing of stove feedstock, charging, material loading, cloth, material-level measure are controlled automatically, reasonable jamproof ability can be had, achieve material level real-time, accurately detect, and alarm signal of transfiniting can be sent in time, accurately, improve the production capacity of stove, guarantee the safe direct motion of stove material loading.
Accompanying drawing explanation
In the present invention, identical Reference numeral represents identical feature all the time, wherein:
Fig. 1 is the structural representation of automatic charging control device of the present invention;
Fig. 2 is winch control system figure;
Fig. 3 is elevator motor inverter control chart;
Fig. 4 is the structural representation of revolving top;
Fig. 5 is charge level trail rod structural representation;
Fig. 6 is that charge level trail rod controls electrical schematic diagram;
Fig. 7 is that charge level trail rod controls electric major loop schematic diagram.
Detailed description of the invention
Technical scheme of the present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1, automatic charging control device of the present invention comprises following critical piece:
1. weighing bucket, 2. hoist engine, 3. revolving top, 4. material cup, 5. charge level trail rod instrument, the gate 7. that 6. surges surges gate, and it controls to mainly contain the control of hoist engine, the control of revolving top, charge level trail rod control three parts compositions.
Symbol description in Fig. 1 ~ Fig. 7 is as follows:
1. weighing bucket
2. hoist engine
3. revolving top, 3.1 rotates revolving top first position, 3.2 rotation revolving top second position, 3.3 rotate revolving top the 3rd positions, 3.4 rotation revolving top the 4th positions, 3.5 rotate revolving top the 5th positions, 3.6 and rotate revolving top the 6th position
4. material cup, 4.1 material cup limit switches reach position, 4.2 material cup limit switches passes and put in place
5. charge level trail rod instrument
6. gate 1, the 6.1 hydraulic brake door limit switch that surges reaches position, 6.2 hydraulic brake door limit switch close and put in place
7. gate 2, the 7.1 hydraulic brake door limit switch that surges reaches position, 7.2 hydraulic brake door limit switch close and put in place
8. low Low Level
9. descend parking stall
10. descend deceleration position
11. upper deceleration position
12. high parking stalls
13. superelevation limitings.
14. low level signals
15. high charge level signals
16. the system of permission is fed in raw material
17. low heavy contact signal
18. weigh high limited signal, truck steel wire rope looseness is spacing
19. truck steel wire rope looseness is spacing
the control of hoist engine
As shown in Figure 1, trolley travelling track is arranged low Low Level 8, lower parking stall 9, lower deceleration position 10, upper deceleration position 11, high parking stall 12 and superelevation limiting 13, wherein deceleration position 10, upper deceleration position 11 dolly positioning intelligent master controller as shown in Figure 2 sends.Rise until upper deceleration position 11 with the frequency of 40Hz when elevator starts, automatic retarding stops to the paramount parking stall ZSH113 of 10Hz, time delay makes the material in car be finished down for about 10 seconds, and then dolly automatically drops to lower deceleration position 10 speed in frequency with the speed of 40Hz and is down to 10Hz until lower parking stall 9.
Dolly detection and localization is made up of critical pieces such as on-the-spot transducing unit, stube cables.On-the-spot transducing unit structure is made up of support, transmission mechanism and rotary encoder; On-the-spot transducing unit is arranged on scene, with controlled plant (dolly elevator motor) power transmission shaft gun iron link, by rotary encoder and stube cable, on-the-spot dolly position signalling is delivered to main control unit, main control unit structure is made up of Programmable Logic Controller, output relay, control power supply etc., main control unit is connected by stube cable with Site Detection transducing unit, common composition intelligent command controller, as shown in Figure 2.
By be rotated in main make work time, encoder is driven to rotate together by controlled plant by the transmission mechanism of Site Detection transducing unit, encoder produces a series of position code and delivers to the input can compiling logic hardware (PLC), perform mathematical calculations in PLC inside process, simultaneously compared with setup parameter adjustable in guidance panel, respectively in upper deceleration position 11, position, 10 2, lower deceleration position sends corresponding control signal, namely given 10Hz frequency (being equivalent to 8MA), send frequency converter A I2 port as shown in Figure 3, and then reach control hoist motor deceleration object, until stop in parking stall.
the control of revolving top.
The rotation of revolving top is by fluid motor-driven.Revolving top has 6 different positions as shown in Figure 2 to discharging in kiln, controlled by 6 proximity switches, each position becomes 60 degree with next position, and each feeding study on period is equivalent to add six bucket doses to truck and revolving top, 15t, has namely spread a layered material in kiln altogether.
First position 3.1 that revolving top feeds in raw material first in kiln is identical with the position that truck is discharged to revolving hopper, after second bucket material is discharged to revolving top 3 by truck, it is reinforced in kiln that revolving top just forwards next position 3.2 to, the rear revolving top that fed in raw material just rotates forward 300 degree and forwards 3.1 positions to, after the 3rd bucket material is discharged to revolving top 3, it is reinforced in kiln that revolving top just forwards next position 3.3 to, and the rear revolving top that feed in raw material just rotates forward 240 degree and forwards 3.1 positions to and treat that the 4th struggles against truck discharging.In like manner the 5th bucket is consistent with the 6th bucket discharging principle.Namely truck is to the always the first one feed location of revolving top discharge position, often adds a pipeful of material, is recorded by counter and memory device.
After being discharged in kiln by the 6th bucket material in revolving top, whole charging system must wait for that charge level trail rod instrument 5 sends new feeding study on period instruction, and in waiting process, revolving top, truck and weighing bucket all should keep full material.
charge level trail rod controls
As shown in Figure 5, material level detector (stroke 0 ~ 1.4m) is established on kiln top, and its material level is by the master controller display on elevator and control.After adding a batch of material, the weight of material level detector puts down, and when spy is to being greater than 1.4m, as the L place of Fig. 5, lamp is bright, and main order provides low material signal, and the weight of material level detector is mentioned continuation and fed in raw material once; When spy is to being less than 1.4m place, weight drops on charge level does not mention, and now slack rope signal provides, and the indicator lamp in Fig. 6 is bright, and main order provides high charge level signal notice hoisting trolley and stops material loading.
Along with discharging at the bottom of kiln, charge level declines, when steel wire rope is tightened, slack rope switch notice elevator continues to put rope, slack rope extremely again, such circulation is until to full stroke, main order provides low material level L signal, and now the weight of material level detector is mentioned to 0 meter of HH place to Fig. 5, and now the permission system of Fig. 6 lamp that feeds in raw material is bright.As shown in Figure 6 and Figure 7, the SW1 height high charge level Switch Controller wherein in Fig. 6 answers the high high charge level of HH0 rice of Fig. 5 to whole charge level trail rod control principle; The low material level of L1.4 rice of the low stuff level switch of the SW2 in Fig. 6 corresponding diagram 5; SW3 rope in Fig. 6 unclamps the H0-1.4 rice high charge level closing corresponding diagram 5.
beneficial effect
Adopt computer control system, the weighing of stove feedstock, charging, material loading, cloth, material-level measure are controlled automatically, through long-play, the logical action of mechanical cam contact is replaced to make operation more reliable with PLC program and contactless encoder, level-sensing device fault rate is zero, achieve material level real-time, accurately detect, and alarm signal of transfiniting can be sent in time, accurately, improve the production capacity of stove, remarkable in economical benefits.
Below by an embodiment, technical scheme of the present invention is described.
Step 1: stove automatic charging can select automatic cycle or manual cycle pattern.If have selected automatic cycle, will by clicking the corresponding key automatic starting/stopping on host computer screen.If selection manual mode, operating personnel will start each motor/or to each solenoid valves, note interlocking.
Step 2: scale hooper is by the suitable lime stone charging in advance with 40-80mm before starting lime stone charging system.The low heavy contact signal 17 of lime stone scale hooper starts lime stone screening feeding system to scale hooper feed.When scale hooper is filled, weigh high limited signal 18 and will stop to scale hooper feed.
Step 3: lime stone loading cycle is started by level signals low in kiln.
Step 4: level-sensing device moves to permission system reinforced 16, enters into protective casing.During whole loading cycle, material-height exploring rod will remain on this position.
Step 5: the permission signal that startup lime stone installs to truck is from after following contact signal appearance,
9 times parking stalls
7.2 hydraulic brake door limit switch close and put in place
4.2 material cup limit switches close and put in place
6.2 hydraulic brake door limit switch close and put in place
18 weigh high limited signal
3.1 rotate revolving top first position
Step 6: when not having following warning to occur, allows signal can start the order filling lime stone to truck.19 truck steel wire rope looseness are spacing.
Step 7: the door being opened lime stone scale hooper by the gate 6 that surges.Limit switch 6.1 indicates to be opened completely.
Step 8: unload lime stone and will wait 3 minutes in truck, this is in timer page adjustable.
Step 9: lime stone scale hooper valve is closed by the gate 6 that surges.Limit switch 6.2 indicates closes completely.
Step 10: lime stone scale hooper prepares again to be feeded, when low heavy contact signal 17 signal occurs, will activate the screening feeding system of lime stone, occurs weighing high limited signal 18 until fill completely.
Step 11: by the gate 2(7 that surges) open kiln top charging sealed gate, limit switch 7.1 indicates and reaches position completely.
Step 12: start hoist engine 2 by Frequency Converter Control low speed
Step 13: after about 10 seconds, by Frequency Converter Control, hoist engine 2 starts by low speed to increasing at a high speed, and switching time can by the corresponding key adjustment on computer screen.
Step 14: when slow down in truck in-position position 11 time, hoist engine 2 is by being switched to low speed at a high speed.
Step 15: when the truck in-position superelevation limiting 13 of low cruise, will be stopped.
Step 16: the stand-by period unloading lime stone to kiln liftout storehouse: 10 seconds, adjust at the timer page by keyboard
Step 17: by Frequency Converter Control, hoist engine 2 will start to decline with low speed.
Step 18: after about 10 seconds, by frequency converter, hoist engine 2 starts by low speed to increasing at a high speed, and switching time can be adjusted by keyboard.
Step 19: after about 10 seconds, by the gate 2(7 that surges) close charging sealed gate.Limit switch 7.2 indicates to close completely and puts in place
Step 20: when position 10 of slowing down under truck in-position, hoist engine 2 is by being switched to low speed at a high speed
Step 21: truck is descending with low speed, when arriving 9 position, parking stall under limit switch, will stop.
Step 22: in the running time of truck, scale hooper is feeded with lime stone again simultaneously.Startup is sieved by the low heavy signal 17 of scale hooper, feeding system, and the heavy signal 18 of height of same scale hooper is by this system of stopping.
Step 23:7.2 hydraulic brake door limit switch closes bit representation limekiln charging sealed gate closes, and opens limekiln material cup cup door by material cup 4.Limit switch 4.1 indicates and reaches position completely.
Step 24: from kiln top revolving top to the stand-by period 20S of discharging in kiln, adjust by keyboard.First car should be discharged at corresponding limit switch 3.1 place.
Step 25: the material cup cup door of closing limekiln by 4.Limit switch 4.2 indicates complete locking.
Step 26: located by revolving top 3, until second of corresponding limit switch 3.2 discharge position.
Step 27: the second car is installed into limekiln as described above with same order and interlocked relationship.Each time to the charging in limekiln, revolving top is all distributed in the next position corresponding to 6 limit switch 3.1-3.6 by by 3.
Step 28: after carrying out 6 chargings, revolving top 3 will be positioned in first discharge position again, corresponding limit switch 3.1.Before 6 batches of loading cycle that beginning one is complete, in charge level detector 5 pairs of kilns, material level detects.
Step 29: start 5 downwards, falls detector bar.If in the whole decline stage, slack rope switch 17 is reaction not, and this means that detector bar does not encounter lime stone, therefore kiln sodalime building stones position is still very low.
Step 30: upwards start 5, promotes detector bar, until the stop position indicated by limit switch 16.
Step 31: after detector bar rises to position 16, system prepares again to the in-built 6 truck lime stones of kiln, and then measures material level in kiln with level-sensing device.System will fill several 6 truck lime stones according to lime stone material level situation continued, often fill a collection ofly all will to detect once, until when high charge level signal 15 occurs, this means that detector bar has encountered lime stone, limekiln is filled.
Step 32: when there is high charge level signal 15 in the detection of lime stone material level, charging schedule will be stopped.Along with discharging at the bottom of kiln, charge level declines, until again there is low material level 14.
Step 33: when low material level 14 occurs in kiln, upwards start 5, rising detector bar is until stop position 16, and 6 car loading cycle of a new round will be activated as described above, and system continues operation by according to same logic afterwards.
Those of ordinary skill in the art will be appreciated that, above description is only one or more embodiments in the numerous embodiment of the present invention, and not uses limitation of the invention.Any equalization for the above embodiment changes, modification and the equivalent technical scheme such as to substitute, as long as spirit according to the invention, all will drop in scope that claims of the present invention protect.
Claims (10)
1. an automatic charging control device, comprises stove, hoist engine control module, distributing device control module and stock rod control module, it is characterized in that:
This stock rod control module comprises charge level trail rod, main control unit, on-site detecting unit and output unit, and this on-site detecting unit detects level signals, and be sent to main control unit, main control unit sends control signal according to level signals by output unit;
Distributing device control module comprises feed location and distributing device, and this distributing device comprises and is multiplely spacedly distributed at hopper circumferentially, according to this control signal revolving hopper to this feed location;
Hoist engine control module comprises hoist engine, positioning unit, central controller and speed adjustment unit, central controller reception control signal, by the original position of positioning unit location hoist engine, by the speed of speed adjustment unit adjustment hoist engine.
2. automatic charging control device as claimed in claim 1, it is characterized in that, this on-site detecting unit comprises transmission mechanism, rotary encoder; Transmission mechanism driven rotary encoder rotates, and rotary encoder produces position code, is sent to main control unit.
3. automatic charging control device as claimed in claim 1, it is characterized in that, this distributing device comprises 6 hoppers, and 60 degree, interval mutually, this feed location is positioned at one of them hopper place.
4. automatic charging control device as claimed in claim 1, it is characterized in that, this stock rod control module also comprises charge level trail rod, and this charge level trail rod is the detector with weight, and be connected with this hoist engine control module, this detector stretches in stove; In stove, set the high charge level of material level and low material level, when detector attains to a high place, send high charge level signal, when reaching low level, send low level signals.
5. automatic charging control device as claimed in claim 4, is characterized in that, when this main control unit receives this high charge level signal, sends stop expecting signal to this hoist engine control module; When this main control unit receives this low level signals, send reinforced signal to this hoist engine control module.
6. automatic charging control device as claimed in claim 1, it is characterized in that, this stove comprises material cup, and fed in raw material by material legendary venomous insect in the top of stove, the bottom discharge of stove.
7. automatic charging control device as claimed in claim 6, it is characterized in that, this stove also comprises the gate that surges, the switch of this hydraulic brake gate control hopper.
8. an automatic charging control method, comprises stove, stock rod control module, hoist engine control module and distributing device control module, it is characterized in that, comprise the following steps:
Step one, sets high charge level and low material level in stove;
Step 2, utilizes the material level in stock rod control module detection stove, sends and stop expecting signal, send reinforced signal when low material level being detected when high charge level being detected;
Step 3, when hoist engine control module receives reinforced signal, to distributing device feed in raw material, receive stop material signal time, stop to distributing device feed in raw material;
Step 4, when distributing device control module receives reinforced signal, rotates its hopper and feeds in raw material, and receives when stopping material signal, stops reinforced.
9. automatic charging control method as claimed in claim 8, it is characterized in that, this stock rod control module comprises main control unit, on-site detecting unit and output unit, this on-site detecting unit is utilized to detect material level, be sent to main control unit, main control unit sends control signal according to material level by output unit;
This distributing device control module comprises a feed location and is multiplely spacedly distributed at hopper circumferentially, according to this control signal revolving hopper to this feed location;
This hoist engine control module comprises hoist engine, positioning unit, central controller and speed adjustment unit, central controller reception control signal, by the original position of positioning unit location hoist engine, by the speed of speed adjustment unit adjustment hoist engine.
10. automatic charging control method as claimed in claim 9, it is characterized in that, this on-site detecting unit comprises transmission mechanism, rotary encoder; Transmission mechanism driven rotary encoder rotates, and rotary encoder produces position code, is sent to main control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410028724.7A CN104792191A (en) | 2014-01-22 | 2014-01-22 | Automatic loading control device and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410028724.7A CN104792191A (en) | 2014-01-22 | 2014-01-22 | Automatic loading control device and control method |
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| CN201410028724.7A Pending CN104792191A (en) | 2014-01-22 | 2014-01-22 | Automatic loading control device and control method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157429A (en) * | 2015-07-29 | 2015-12-16 | 中卫市茂烨冶金有限责任公司 | Automatic feeding system used for submerged arc furnace |
| CN108726207A (en) * | 2018-07-13 | 2018-11-02 | 江苏超人智能科技有限公司 | A kind of automatic positioning feeder |
| CN109335718A (en) * | 2018-09-29 | 2019-02-15 | 中冶长天国际工程有限责任公司 | A kind of limekiln feeding process control method and system |
| CN109407589A (en) * | 2018-12-04 | 2019-03-01 | 中冶焦耐(大连)工程技术有限公司 | Coal single bucket elevator control device and control method more than a kind of |
| CN115058550A (en) * | 2022-06-17 | 2022-09-16 | 山东莱钢永锋钢铁有限公司 | Control method for measuring material level stock rod at top of blast furnace |
-
2014
- 2014-01-22 CN CN201410028724.7A patent/CN104792191A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105157429A (en) * | 2015-07-29 | 2015-12-16 | 中卫市茂烨冶金有限责任公司 | Automatic feeding system used for submerged arc furnace |
| CN108726207A (en) * | 2018-07-13 | 2018-11-02 | 江苏超人智能科技有限公司 | A kind of automatic positioning feeder |
| CN109335718A (en) * | 2018-09-29 | 2019-02-15 | 中冶长天国际工程有限责任公司 | A kind of limekiln feeding process control method and system |
| CN109407589A (en) * | 2018-12-04 | 2019-03-01 | 中冶焦耐(大连)工程技术有限公司 | Coal single bucket elevator control device and control method more than a kind of |
| CN115058550A (en) * | 2022-06-17 | 2022-09-16 | 山东莱钢永锋钢铁有限公司 | Control method for measuring material level stock rod at top of blast furnace |
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