CN102787189A - Method for weighing stable material empty of blast furnace charging bucket by electronic scale - Google Patents
Method for weighing stable material empty of blast furnace charging bucket by electronic scale Download PDFInfo
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- CN102787189A CN102787189A CN2011101355106A CN201110135510A CN102787189A CN 102787189 A CN102787189 A CN 102787189A CN 2011101355106 A CN2011101355106 A CN 2011101355106A CN 201110135510 A CN201110135510 A CN 201110135510A CN 102787189 A CN102787189 A CN 102787189A
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Abstract
The present invention provides a method for weighing stable material empty of a blast furnace charging bucket by an electronic scale. The method is carried out according to the following steps: under the circumstance of opening all material flow valves of the charging bucket, recording a buildup value G[empty] of the charging bucket as a reference amount for buildup of the charging bucket when the weight of a prior charging bucket does not change; making a positive fluctuation compensation for a next batch of material empty values as a material empty reference value for a current batch of material G[material empty]=G[empty]+G[hysteresis value]; comparing a charging bucket weighing value G[weighing value] and the G[material empty] in process of the material feeding of the batch, wherein when G[weighing value]<G[material empty], a material empty early signal is sent out, so that the material flow valves controlling the material batch flow velocity are all opened, and when G[weighing value] no longer changes, the real material empty is sent out, and the weighing value G[weighing value] is continuously maintained as a buildup cumulative value of next material batch, thus the material feeding of the charging bucket is finished. According to the invention, the selected sampling time for the buildup value of the charging bucket is scientific, continuous adjustments on the actual meter weighing value are needed when the operating system of the blast furnace is changed to guarantee that the pressure change does not affect to send out the material empty normally, and the problem of unstable material empty of the charging bucket caused by furnace pressure changes in the blast furnace and the different buildup degrees in the material feeding charging bucket can be overcome.
Description
Technical field
The present invention relates to the relevant autocontrol method of field of metallurgy blast furnace, the method that a kind of specifically blast furnace bucket electronic scale weighing stablizing issuance of materials is empty.
Background technology
It is the gordian technique in the blast furnace ironmaking process that the blast furnace system batch can normally sends the material sky; So-called " it is empty to send material " is exactly in the middle of the hopper normal pressure gets into, behind the batch can, in batch can, to fill high pressure and furnace pressure balance when smelting mineral, sends into mineral in the stove through distribution device then; Because of the fluctuation of furnace pressure and the imperfection of control techniques; Mineral often occur and in batch can, can not send out sky (promptly output) fully, the result will cause can not automatic charging, needs manual intervention; Can cause batch can occurring because of the variation of pressure in the batch can of full material when serious and send out spacing wave; Next batch of material kind is placed into again in the batch can of full material, thereby the accident that batch can not load occurs, need to stop production and handle.
The existing both at home and abroad blast furnace bucket signal transmitter of weighing does not have unified pattern at present; Traditional method is the gamma-rays method; Promptly adopt the empty situation of gamma-rays monitoring reaction batch can material; Though it is more accurate; But, therefore in new blast furnace system, all be not equipped with the gamma-rays generating means owing to adopt the radioactivity element to have potential safety hazard; The general at present electronic scale weight method that adopts, but because fluctuation of State of Blast Furnace internal pressure and mineral change, the phenomenon that batch can material sky is not sent out still usually appears.
Summary of the invention
Technical problem to be solved by this invention is; Shortcoming to above prior art existence; The empty method of a kind of blast furnace bucket electronic scale weighing stablizing issuance of materials is proposed, can overcome the State of Blast Furnace internal pressure change with distribution bucket in the different and batch can material sky problem of unstable that causes of buildup degree.
The technical scheme that the present invention solves above technical problem is:
The method that blast furnace bucket electronic scale weighing stablizing issuance of materials is empty; Blast furnace with its top hopper between be connected through batch can with weighing device; Be respectively equipped with material feeding valve and flow control valve between the discharge port of hopper and the import of blast furnace, blast furnace bucket electronic scale weighing stablizing issuance of materials sky carries out according to the following steps:
(1) with the batch can buildup value G that stores
EmptyWith send out the sky offset G that just fluctuating
Go back to the value of stagnatingSum is as the empty reference value G of material
Material is empty=G
Empty+ G
Go back to the value of stagnating
(2) close the materials flow valve, open the material feeding valve, make down batch of material get into batch can;
(3) close the material feeding valve, and local open the materials flow valve after, with weighing device claim AW G
The weighing valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare, when batch can weighing value greater than the material empty reference value G
The weighing value＞G
Material is emptyThe time, keep the existing opened condition of materials flow valve; When batch can weighing value less than the material empty reference value G
The weighing value＜G
Material is emptyThe time, control materials flow valve is opened fully;
(4) when said weighing device claim batch can weighing value G
The weighing valueThe stable scheduled time is sent certain material spacing wave when no longer changing, and finishes this cloth, and with batch can weighing value G at this moment
The weighing valueUpgrade batch can buildup value G
Empty
If the sampling time is inaccurate; Judge the just inaccurate of buildup value; In the blast furnace material distribution process; Have only the buildup value of that batch of material of current charge front can reflect the situation of buildup in the batch can,, choose batch can buildup value science sample time so the present invention carries out the material sky lead of positive error compensation as current charge to the buildup value of previous charge.
On the basis of buildup reference value, carry out a positive error compensation, in batch can, prepare the empty lead of issuance of materials as current charge; This lead is very crucial, and this value has been got greatly, expects that empty lead sends in advance; Can cause other equipment to move in advance; If in advance value is got for a short time,, cause expecting that sky do not send out easily because pressure surge.The present invention is on the basis that batch can buildup reference quantity is confirmed; The null value of sending out to next batch is done a positive oscillation compensation; In batch can, prepare the empty lead of issuance of materials as current charge, what need not when blast furnace changes operating duty, not stop adjusts the actual weighing value of instrument, guarantees empty the sending of material.
The technical scheme that the present invention further limits is:
The method that aforesaid blast furnace bucket electronic scale weighing stablizing issuance of materials is empty when the kind of material is the ore deposit, is sent out the sky offset G that just fluctuating
Go back to the value of stagnatingGet 800KG; When the kind of material when being Jiao, send out the sky offset G that just fluctuating
Go back to the value of stagnatingGet 500KG.Through this hysteresis value control, can overcome the fluctuation of current charge buildup value and State of Blast Furnace internal pressure fully.
The method that aforesaid blast furnace bucket electronic scale weighing stablizing issuance of materials is empty is in the step (3), if the weighing value G of batch can
The weighing value＞G
Material is emptyThe time, send alerting signal.Be that the weighing that the fluctuation of pressure causes changes G
The weighing value＞G
Empty+ G
Go back to the value of stagnatingThe time, remind, to have reduced the influence that pressure surge brings to system.Because the weighing that the fluctuation of pressure causes changes greater than G
Go back to the value of stagnatingDuring value, remind, significantly reduced the influence that pressure surge brings to system; G in addition down nonserviceables
EmptyRaising material null value that can not be random can improve constantly, so must be set up material empty ultimate value, i.e. a G
Empty+ G
Go back to the value of stagnatingSurpass this value and must carry out the fault prompting, keep G simultaneously
Empty+ G
Go back to the value of stagnatingFor steady state value is controlled the material sky.
The method that aforesaid blast furnace bucket electronic scale weighing stablizing issuance of materials is empty, in the step (3), when State of Blast Furnace internal pressure during greater than 1KP, with weighing device claim AW G
The weighing valueDeduct pressure compensation value G
The pressure compensation valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare; When the State of Blast Furnace internal pressure is lower than 1KP, with weighing device claim AW G
The weighing valueAdd pressure compensation value G
The pressure compensation valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare; G
The pressure compensation valueCalculation formula be: G
The pressure compensation value=P
Pressure in the stove* Δ S
The surface-area estimation, P
Pressure in the stoveBe pressure in the State of Blast Furnace, Δ S
The surface-area estimationBe that the corrugated tube flexible joint part cross-sectional surface that influenced by the blast furnace internal pressure is amassed.When the State of Blast Furnace internal pressure is higher than 1KP, to adopt under-compensated method to pressure compensation; When the State of Blast Furnace internal pressure is lower than 1KP, to adopt the method for over-compensation to pressure compensation.Can solve of the influence of blast furnace roof pressure like this to batch can weight.Consider that the State of Blast Furnace internal pressure is to batch can and the influence at the positions that are flexible coupling such as corrugated tube is arranged; Analyze blast furnace from 0 to 2.5MP boost with the step-down process; Can produce buoyancy to being similar to batch can and other positions that is flexible coupling; And a lot of places of Top of BF steelwork all are interactional, so in the pressure change process, must consider these because the buoyancy change that pressure change causes.The variation of buoyancy directly causes weighing of batch can fluctuation to occur, causes expecting that sky do not send out, and the present invention takes into full account this place of carelessness easily, carries out formula clearing compensation, guarantees that the variation of pressure does not influence empty normally the sending of material.
Description of drawings
Fig. 1 is that hopper of the present invention is connected synoptic diagram with body of heater.
Fig. 2 is a schema of the present invention.
Wherein: 1 is batch can among Fig. 1, the 2nd, and body of heater, the 3rd, material feeding valve, the 4th, upper sealing valve, the 5th, flow control valve, the 6th, lower seal valve, the 7th, corrugated tube, the 8th, electronic scales pressure head, the 9th, pressure-equalizing and discharging valve, the 10th, even valve, the 11st, hopper.
Embodiment
Embodiment 1
Hopper of the present invention is connected as shown in Figure 1 with body of heater, in normal material loading process, after the raw materials for metallurgy of blast furnace is sent into hopper 11 through transport pathway; At first pressure-equalizing and discharging valve 9 discharges the pressure in the batch can 1, is reaching when balancing each other with atmospheric pressure, and occlusion pressure is diffused valve 9; Open upper sealing valve 4, upper sealing valve 4 open put in place after, open material feeding valve 3 again; At this time furnace charge discharges in batch can 1 from hopper 11; Along with furnace charge ceaselessly flows to batch can 1, jar variation of tuple amounts (electronic scales generally around columniform batch can uniform distribution three or four) appears in the equipment electronic scales pressure head 8 that at this moment detects batch can weight, after the furnace charge of hopper 11 all gets into batch can 1; Material feeding valve 3 cuts out, and closes upper sealing valve 4 successively; At this moment, when satisfying the cloth condition, 10 pairs of batch cans 1 of pressure-balance valve body of calming the anger of leaping high makes the pressure of batch can 1 and the pressure equilibrium in the highly compressed body of heater 2, could not form pressure reduction like this, guarantees that furnace charge discharges in body of heater 2.After pressure equilibrium, open lower seal valve 6, open the flow control valve 5 of control speed of material descent successively, this moment, furnace charge carried out the spreading by rule in blast furnace 2, was slowly tailing off at furnace charge, and during to certain value, it is empty to prepare issuance of materials.Can not in time send if at this time expect sky, then the cloth state will continue always, and problem appears in the blast furnace continuous production, the clearing of following batch cloth model added up with other system gross error to occur simultaneously.
Because have only the buildup value of that batch of material of current charge front can reflect the situation of buildup in the batch can, thus present technique previous batch can weight under the situation that material valve is all opened, batch can weight does not change, and at this time the buildup value is carried out and is write down G
Empty
Accurately hold the lead of material sky, the full value of material, adopt the hysteretic characteristic algorithm, reserve a variation space that causes jar heavy to pressure surge, at batch can buildup reference quantity G
EmptyOn the basis of confirming, the null value of sending out of next batch is a positive oscillation compensation G
Go back to the value of stagnatingAfter, as the empty reference value of the material of current charge, the ore deposit is got 800 kilograms, and coke is got 500 kilograms.Through this hysteretic characteristic, can overcome the fluctuation of current charge buildup value and State of Blast Furnace internal pressure fully.
When batch can weighing value greater than the material empty reference value G
The weighing value＞G
Material is emptyThe time, keep the existing opened condition of materials flow valve; Weighing value G when batch can
The weighing value＜G
Empty+ G
Go back to the value of stagnatingThe time, just send the empty signal in advance of material, let the material valve of control charge flow velocity all open, because G is arranged
Go back to the value of stagnatingThe assurance of this value, after material valve was all opened, the material in the batch can continued to be placed in the State of Blast Furnace, and this is G
The weighing valueGradually diminishing value G
The weighing valueWill be always less than G
Empty+ G
Go back to the value of stagnatingThe time, time-delay for some time, it is empty to send real material, G
The weighing valueTo no longer change, at this moment weighing value G
The weighing valueContinue to keep, as the buildup aggregate-value of next charge, this moment, the batch can cloth finished, and the material sky normally sends, and in this cloth process, the weighing variation that the fluctuation of pressure causes is greater than G
Go back to the value of stagnatingDuring value, just remind, significantly reduced the influence that pressure surge brings to system.Another possibly be that G down nonserviceables
EmptyRaising material null value that can not be random can improve constantly, so must be set up material empty ultimate value, i.e. a G
Empty+ G
Go back to the value of stagnatingSurpass this value and must carry out the fault prompting, keep G simultaneously
Empty+ G
Go back to the value of stagnatingFor steady state value is controlled the material sky.
Solve of the influence of blast furnace roof pressure to batch can weight.The State of Blast Furnace internal pressure is very high, and the external pressure of batch can communicates, and is different in different top pressures to the buoyancy that batch can produces like this; The corrugated tube that the system that blast furnace is influenced by pressure all adopts (among Fig. 1 7) is flexible coupling, and can overcome the influence of HTHP system to steelwork, especially stops, before and after the slow wind; Pressure surge is big especially; So must consider the influence of pressure change to batch can, this is a key point of present technique scheme, compensate so must influence batch can to pressure; Because pressure is irregular to the face of batch can influence; So the surface-area of influence will estimate that the surface-area of following seal valve lower surface and homogeneous system valve plate multiply by surface-area (G for to influence the surface-area basis with pressure usually
The pressure compensation value=P
Pressure in the stove* Δ S
The surface-area estimation) (Δ S
The surface-area estimationBe to receive the corrugated tube 7 flexible joint part cross-sectional surface that the blast furnace internal pressure influences long-pending) the mode compensatory pressure to the influence of whole Weighing system; According to result of experiment; Usually divide two-stage to pressure compensation, when one-level is higher than 1KP in the State of Blast Furnace internal pressure, will adopt under-compensated method more effective pressure compensation; And when being lower than 1KP, to adopt the method for over-compensation to pressure compensation.
The method flow of blast furnace bucket electronic scale weighing the stablizing issuance of materials sky of present embodiment is as shown in Figure 2; When starting shooting for the first time; Under the situation that material feeding valve 3 cuts out, materials flow valve 5 is all opened; When electronic scales claim batch can 1 weight stablized for 2 seconds (oversize influence whole cloth time time) when not changing, the electronic scales of record this moment shows weight G
Empty, as the buildup value of batch can 1.
Afterwards, the weighing of blast furnace bucket electronic scale is stablized the issuance of materials sky and is carried out according to the following steps:
(1) with the batch can buildup value G that stores
EmptyWith send out the sky offset G that just fluctuating
Go back to the value of stagnatingSum is as the empty reference value G of material
Material is empty=G
Empty+ G
Go back to the value of stagnatingIf material kind of a kind is the ore deposit, sends into G to the numerical value of 800KG
Go back to the value of stagnatingIn; If material kind of a kind is burnt, send into G to the numerical value of 500KG
Go back to the value of stagnatingIn;
(2) close the materials flow valve, open the material feeding valve, make down batch of material get into batch can;
(3) close the material feeding valve, and local open the materials flow valve after, with weighing device claim AW G
The weighing valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare, when batch can weighing value greater than the material empty reference value G
The weighing value＞G
Material is emptyThe time, keep the existing opened condition of materials flow valve; When batch can weighing value less than the material empty reference value G
The weighing value＜G
Material is emptyThe time, control materials flow valve is opened fully;
If the weighing value G of batch can
The weighing value＞G
Material is empty, i.e. the weighing that the fluctuation of pressure causes changes G
The weighing value＞G
Empty+ G
Go back to the value of stagnatingThe time, remind, to have reduced the influence that pressure surge brings to system;
When State of Blast Furnace internal pressure during greater than 1KP, to adopt under-compensated method to pressure compensation, with weighing device claim AW G
The weighing valueDeduct pressure compensation value G
The pressure compensation valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare; When the State of Blast Furnace internal pressure is lower than 1KP, to adopt the method for over-compensation to pressure compensation, with weighing device claim AW G
The weighing valueAdd pressure compensation value G
The pressure compensation valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare; G
The pressure compensation valueCalculation formula be: G
The pressure compensation value=P
Pressure in the stove* Δ S
The surface-area estimation, P
Pressure in the stoveBe pressure in the State of Blast Furnace, Δ S
The surface-area estimationBe that the corrugated tube flexible joint part cross-sectional surface that influenced by the blast furnace internal pressure is amassed.
(4) when said weighing device claim batch can weighing value G
The weighing valueStablize the scheduled time (being generally for 2 seconds, the whole cloth time of oversize influence of time) and when no longer changing, send certain material spacing wave, finish this cloth, and with batch can weighing value G at this moment
The weighing valueUpgrade batch can buildup value G
Empty
Present embodiment carries out the positive error compensation to the buildup value of previous charge as the empty lead of the material of current charge simultaneously at first the reference of the buildup situation of one batch nearest furnace charge in batch can as current charge buildup situation.Blast furnace burden concerning each jar the material kind; All there is furnace charge in from batch can cloth to blast furnace each time and once sends out empty process; But because the concrete situation in the batch can is different; Buildup degree in batch can is also different, if set the material null value for fixed value, the problem of empty or not emptying is sent out in appearance in advance easily.Present embodiment is carrying out record near a buildup in the jar of the charge in front of this batch kind, as a reference value of written or printed documents batch buildup, considers that this reference value also only is the value of last one batch buildup; So this reference value is done the compensation of positive error, as the lead of the empty reference value of material of this batch, when this batch kind is carried out cloth; If the buildup value in the last batch can is lower than the lead of the empty reference value of material, just prepare the issuance of materials sky, after time-delay; There is not the buildup value to change; Explain that real material is empty, and keep a record this value, as the empty buildup reference value of next batch.
When really carrying out batch can material sky integrating, on the basis of buildup reference value, carry out a positive error compensation; In batch can, prepare the empty lead of issuance of materials as current charge, this lead is very crucial, and this value has been got greatly; Expect that empty lead sends in advance, can cause other equipment to move in advance, if value is got little in advance; Easily because pressure surge, cause expecting that sky do not send out.This method has just reduced the deficiency of direct comparison method commonly used; Direct comparison method is generally material null value indirect assignment, and the numerical value that weighs with instrument when batch can just sends spacing wave when being lower than the material null value, because this material null value is an empirical value; Under normal circumstances still stable; But when the working of a furnace occurs unusually when occurring changing with mineral, fluctuation will occur, will occur the empty or not reciprocal concussion of arriving like this; That need when the blast furnace of being everlasting changes operating duty, not stop adjusts the actual weighing value of instrument, guarantees empty the sending of material.
Consider that the State of Blast Furnace internal pressure is to batch can and the influence at the positions that are flexible coupling such as corrugated tube is arranged; Analyze blast furnace from 0 to 2.5MP boost with the step-down process; Can produce buoyancy to being similar to batch can and other positions that is flexible coupling; And a lot of places of Top of BF steelwork all are interactional, so in the pressure change process, must consider these because the buoyancy change that pressure change causes.The variation of buoyancy directly causes weighing of batch can fluctuation to occur, causes expecting that sky do not send out, and present embodiment takes into full account this place of carelessness easily, carries out formula clearing compensation, guarantees that the variation of pressure does not influence empty normally the sending of material.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (4)
1. the empty method of issuance of materials is stablized in the weighing of blast furnace bucket electronic scale; Said blast furnace with its top hopper between be connected through batch can with weighing device; Be respectively equipped with material feeding valve and flow control valve between the discharge port of said hopper and the import of blast furnace, it is characterized in that: said blast furnace bucket electronic scale weighing stablizing issuance of materials sky carries out according to the following steps:
(1) with the batch can buildup value G that stores
EmptyWith send out the sky offset G that just fluctuating
Go back to the value of stagnatingSum is as the empty reference value G of material
Material is empty=G
Empty+ G
Go back to the value of stagnating
(2) close the materials flow valve, open the material feeding valve, make down batch of material get into batch can;
(3) close the material feeding valve, and local open the materials flow valve after, with weighing device claim AW G
The weighing valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare, when batch can weighing value greater than the material empty reference value G
The weighing value＞G
Material is emptyThe time, keep the existing opened condition of materials flow valve; When batch can weighing value less than the material empty reference value G
The weighing value＜G
Material is emptyThe time, control materials flow valve is opened fully;
(4) when said weighing device claim batch can weighing value G
The weighing valueThe stable scheduled time is sent certain material spacing wave when no longer changing, and finishes this cloth, and with batch can weighing value G at this moment
The weighing valueUpgrade batch can buildup value G
Empty
2. the method that blast furnace bucket electronic scale as claimed in claim 1 weighing stablizing issuance of materials is empty is characterized in that: when the kind of said material is the ore deposit, and said sky offset G that just fluctuating
Go back to the value of stagnatingGet 800KG; When the kind of said material is Jiao, said sky offset G that just fluctuating
Go back to the value of stagnatingGet 500KG.
3. the method that blast furnace bucket electronic scale as claimed in claim 1 weighing stablizing issuance of materials is empty is characterized in that: in the said step (3), if the weighing value G of batch can
The weighing value＞G
Material is emptyThe time, send alerting signal.
4. the method that blast furnace bucket electronic scale as claimed in claim 1 weighing stablizing issuance of materials is empty is characterized in that: in the said step (3), when said State of Blast Furnace internal pressure during greater than 1KP, with weighing device claim AW G
The weighing valueDeduct pressure compensation value G
The pressure compensation valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare; When the State of Blast Furnace internal pressure is lower than 1KP, with weighing device claim AW G
The weighing valueAdd pressure compensation value G
The pressure compensation valueAs batch can weighing value and the empty reference value G of material
Material is emptyCompare; Said G
The pressure compensation valueCalculation formula be: G
The pressure compensation value=P
Pressure in the stove* Δ S
The surface-area estimation, said P
Pressure in the stoveBe pressure in the State of Blast Furnace, said Δ S
The surface-area estimationBe that the corrugated tube flexible joint part cross-sectional surface that influenced by the blast furnace internal pressure is amassed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101355106A CN102787189A (en) | 2011-05-20 | 2011-05-20 | Method for weighing stable material empty of blast furnace charging bucket by electronic scale |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101355106A CN102787189A (en) | 2011-05-20 | 2011-05-20 | Method for weighing stable material empty of blast furnace charging bucket by electronic scale |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388618A (en) * | 2014-12-10 | 2015-03-04 | 天俱时工程科技集团有限公司 | Gravimetric-method material distribution device for medium and small sized ironmaking blast furnaces and material distribution method of device |
| CN107797513A (en) * | 2016-08-31 | 2018-03-13 | 上海梅山钢铁股份有限公司 | The control method of weight reduction magazine discharging |
-
2011
- 2011-05-20 CN CN2011101355106A patent/CN102787189A/en active Pending
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| 姚振爽: "施耐德昆腾PLC在高炉上料系统中的应用", 《中国科技信息》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388618A (en) * | 2014-12-10 | 2015-03-04 | 天俱时工程科技集团有限公司 | Gravimetric-method material distribution device for medium and small sized ironmaking blast furnaces and material distribution method of device |
| CN104388618B (en) * | 2014-12-10 | 2017-02-22 | 天俱时工程科技集团有限公司 | Gravimetric-method material distribution device for medium and small sized ironmaking blast furnaces and material distribution method of device |
| CN107797513A (en) * | 2016-08-31 | 2018-03-13 | 上海梅山钢铁股份有限公司 | The control method of weight reduction magazine discharging |
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Application publication date: 20121121 |