CN102747216A - Method for controlling steel slab gap in heating furnace - Google Patents
Method for controlling steel slab gap in heating furnace Download PDFInfo
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- CN102747216A CN102747216A CN2011100991458A CN201110099145A CN102747216A CN 102747216 A CN102747216 A CN 102747216A CN 2011100991458 A CN2011100991458 A CN 2011100991458A CN 201110099145 A CN201110099145 A CN 201110099145A CN 102747216 A CN102747216 A CN 102747216A
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Abstract
The invention relates to a method for controlling the steel slab gap in a heating furnace. The method comprises the steps of steel stroke control, steel vacancy control and furnace map position track, wherein a formula that A=A1+A2-A3-A4 is adopted in the steel vacancy control step; A is a distance from a next steel slab to the tail of a fixed beam, and is in mm; A1 is a distance between the last slab on the fixed beam and the tail of the fixed beam, and is in mm; A2 is a step pitch of a stepping beam, and is in mm; A3 is a slab gap and is in mm; and A4 is a slab width. The slab spacing in the slag heating furnace is dynamically adjusted and tracked through the steel stroke control, the steel vacancy control and the furnace map position track according to the method for controlling the steel slab gap in the heating furnace of the invention, so slab surface quality defects caused by the slab gap are reduced. The heating non-uniformity generation frequency of bonding steel and the slabs is substantially reduced, the slab heating quality is ensured, and the production efficiency is improved.
Description
Technical field
The present invention relates to a kind of control method, belong to automation field.Be a kind of method of controlling steel billet gap in the process furnace specifically, be used to reduce the mass defect of steel slab surface.
Background technology
It is multiple to cause the reason of slab surface defects of products to have, like slab heating temperature homogeneity, slab quantity, slab time inside furnace etc. in the stove in the unit time.Wherein the slab gap length directly influences the various performance index that slab heats in the stove.The slab excessive clearance, the slab quantity through process furnace in the unit time reduces, and does not make full use of the heat energy of process furnace, causes power loss; The slab gap is too small, causes the slab steel bonding easily, the cut that when coming out of the stove control, causes rolling of slide rail generation not fall.
Because it is slab is numerous in variety, little in batches.The slab specifications vary differs in the stove, and the situation of the many bases of a stove often occurs, and is as shown in Figure 1, is heating furnace body slab schematic layout pattern, and wherein d is expressed as the slab gap.Slab gap in the general Thick Plate Plant heating-furnace; Be with reference to hot-rolling heating furnace universal design both at home and abroad in design and control: all slab gaps are fixed value (numerical value after the processing requirement after field adjustable is accomplished) in the stove; Dynamically adjustment in can not producing, this just makes the firm stroke of dress in the PLC robotization key-course calculate with room calculating and can't dynamically adjust according to the different of slab specification.The fixing non-adjustable process control computer system that also makes in slab gap can't be according to the different dynamic tracking that realize slab in the process furnace of slab specification.But the slab kind of slab is more; With hot rolling very big-difference is arranged, this has just increased the difficulty of different generous specification slab heating controls in the stove, can not guarantee that the burning of generous slab is equal, grill thoroughly; Be easy to generate steel bonding and slab heating uniformity problem, directly have influence on the surface quality of finished product steel plate.
Summary of the invention
The technical problem that the present invention will solve is: a kind of method of controlling steel billet gap in the process furnace is provided, and this method can dynamically be adjusted and follow the tracks of slab furnace plate blank spacing, thereby reduces invar base gap and the mass defect of the steel slab surface that causes.
In order to solve the problems of the technologies described above, the present invention provides a kind of method of controlling steel billet gap in the process furnace, and this method comprises dress steel Stroke Control, the room control of dress steel and stove figure location tracking; Said dress steel room A refers to the distance of next cartridge plate base afterbody apart from the fixed beam afterbody,
Following formula is adopted in the control of said dress steel room:
A＝A1+A2-A3-A4 (1)
Wherein,
A is the distance of next cartridge plate base apart from the fixed beam afterbody, and unit is mm;
A1 is that last piece slab is to the distance between the fixed beam afterbody on the fixed beam, and unit is mm;
Calculation formula is:
A1=dress steel machine TP-dress steel machine minimum stroke+(pressure pin length-push away just retreat coefficient * A4-push away just retreat constant) (2)
A2 is the walking beam step pitch, and unit is mm;
A3 is the slab gap, and unit is mm;
A4 is a width of plate slab, and unit is mm.
At last, go out and control steel billet gap A3 in the process furnace by the above-mentioned derivation of equation,
Said steel billet gap A3 is controlled at 100mm-8000mm.
A3 is the slab gap, imports from the production operation personnel.Concrete size of data can be different and dynamically set by producers according to production program steel grade and specification.Setting range is 100mm-8000mm at present, but this data area, can adjust according to the manufacturing technique requirent scene gets.Said dress steel machine TP refers to adorn the position between steel machine minimum, the range.
According to the method in steel billet gap in the control process furnace of the present invention, said dress steel Stroke Control refer to adorn the steel machine push away just advance with retreat, adorn steel advance with fallback procedures in position control; Position control when the control of said dress steel room refers to next piece slab dress steel permission; Said stove figure location tracking refers to the tracking of process computer to slab quantity in the stove and slab position.
Method according to steel billet gap in the control process furnace of the present invention is characterized in that,
Said dress steel machine TP is 4750mm～5150mm,
Said dress steel machine minimum stroke is 4750mm,
Said A2 walking beam step pitch is 550-600mm,
Said A4 width of plate slab is 1300mm～2300mm.
Said dress steel machine minimum stroke can be decided according to the walking-beam furnace Design of Mechanical Structure, and minimum stroke is 4750mm.Said A2 walking beam step pitch is 550-600mm, but the scene is a fixed value after adjusting.
Because the principal element of the above-mentioned position control of influence comprises: walking beam miles of relative movement (fixed value; It is 550mm), width of plate slab (1300mm～2300mm, according to the production program confirm), slab gap (can be different and dynamically set) by producers according to steel grade and specification.And according to the method in steel billet gap in the control process furnace of the present invention, mainly be that dynamic conditioning is carried out in the slab gap, to reach, reduce iron scale content to various slab better heating effect, therefore, in the above-mentioned scope of this value.
Method according to steel billet gap in the control process furnace of the present invention is characterized in that said pressure pin length is 1800mm, saidly pushes away that just to retreat coefficient be 0-1, saidly pushes away that just to retreat constant be 100-200mm.
Dress steel machine TP is to be confirmed by dress steel Stroke Control, is generally 750mm～5150mm in dress steel machine TP, and during dress steel machine minimum stroke 4750mm, said pressure pin length can be decided according to Design of Mechanical Structure.Value pressure pin length 1800mm saidly pushes away that just to retreat coefficient be 0-1, but concrete field adjustable and decide, and said pushing away just retreated constant 100-200mm, specifically field adjustable and deciding.
Method according to steel billet gap in the control process furnace of the present invention is characterized in that said pushing away just retreated coefficient 0.67, pushes away and just retreats constant 100-150.
Method according to steel billet gap in the control process furnace of the present invention is characterized in that said pushing away just retreated coefficient 0.67, pushes away and just retreats constant 100.
According to the method in steel billet gap in the control process furnace of the present invention, said dress steel minimum stroke, pressure pin length are to be decided by the walking-beam furnace Design of Mechanical Structure.Said pushing away just retreated coefficient and pushed away that just to retreat constant be to be summed up by on-site experience to decide.Its major influence factors comprises: walking beam miles of relative movement (fixed value, it is 550mm), width of plate slab (1300mm～2300mm confirms according to the production program), slab gap (can be different and dynamically set by producers according to steel grade and specification).
According to the method in steel billet gap in the control process furnace of the present invention, in the method in steel billet gap, the mathematical model that said stove figure location tracking adopts is in described control process furnace:
s.t.d
i＝d
i-1+w
i+s
ij (3.4)
w
i＞0，i＝1，2，…N (3.3)
d
i＞0，i＝1，2，...，N (3.4)
s
ij＞0，i＝1，2，...，N，j＝0，1，...，N-1(3.5)
Wherein,
N is interior, the to be heated slab number of stove of packing into, and 1 to N is the coding of slab;
L is the furnace superintendent of process furnace, and unit is mm;
Q is a roller-way medullary ray fixed beam distance, and unit is mm;
C={1,2 ..., N} refers to adorn the steel room;
C
iBe the dress steel room of i piece slab, wherein 1 represent first block of slab dress steel room;
d
iBe the distance of i piece slab to monitor, d
i＞0, unit is mm;
w
iBe the width of i piece slab, w
i＞0, unit is mm;
s
IjBe the spacing of i piece slab and j piece slab, and j=i-1, s
Ij＞0, unit is mm.
Method according to steel billet gap in the control process furnace of the present invention is characterized in that, N decides according to the width and the slab gap length of slab in the stove of packing into, and L is 57300mm, and Q is 3525mm.
According to the present invention, L is decided by field apparatus installation site and furnace length, and Q is decided by the field apparatus installation site.
Method according to steel billet gap in the control process furnace of the present invention is characterized in that said monitor is the exit side laser detector, leaves apart from tapping side discharging roller-way center line distance to be 4700mm.
Method according to steel billet gap in the control process furnace of the present invention; Said monitor effect is to judge that slab is to going out stove gate; State to be come out of the stove; Therefore its position data is decided by the field apparatus installation site, and according to the present invention, this distance can be taken as: it is 4700mm that laser detector leaves apart from tapping side discharging roller-way center line distance.
Method according to steel billet gap in the control process furnace of the present invention is characterized in that, it also comprises the step pitch control to walking beam, and the proportional valve control system is adopted in said step pitch control, regulates the size of step pitch through the aperture of regulating proportional valve.
Proportional valve control according to the present invention system; In its electromagnetic system of electrical signal input, just can produce and the proportional electromagnetic push of electric current this Thrust Control respective element and spool; The pressure that causes the spool equilibrium system to be set up makes system pressure and electrical signal proportional.Like input electrical signal in proportion or certain change of program, then each parameter of system is also along with variation.
Method according to steel billet gap in the control process furnace of the present invention; In stove, being provided with fixed beam and walking beam constitutes; Wherein, walking beam is made up of translation structure framework and lifting structure framework, stops during to certain altitude through hydraulic lifting hydraulic oil cylinder driving lifting structure framework; Driving the translation structure framework by translation oil cylinder again carries slab in the stove once; Wherein carrying stroke distances once is referred to as a step pitch, and its step pitch is to confirm as a fixed value behind the field adjustable, generally is 550-600mm.Leave in then on the stove internal fixing beam, wherein, slab change in location in the stove is a motion realization repeatedly of being made rectangular path by walking beam mechanism in the stove.
The travelling speed control of above-mentioned " translation or lifting structure frame " is by the PLC programming acceleration and deceleration curves to be set, and is to implement the proportional valve aperture parameter that classification is set according to the position of the displacement sensor of installing in the oil cylinder, and realization speed-displacement curve steady running.Thereby both avoided impacting the injury that equipment is caused, improved the bearing accuracy of system again.
Method according to steel billet gap in the control process furnace of the present invention; Through dress steel Stroke Control, dress steel room are controlled and stove figure location tracking; Realization is dynamically adjusted and is followed the tracks of slab furnace plate blank spacing, thereby reduces invar base gap and the mass defect of the steel slab surface that causes.Reduce the frequency that steel bonding and slab heating ununiformity takes place greatly, guaranteed the quality of slab heating, improved production efficiency.
Description of drawings
Fig. 1 is a heating furnace body slab schematic layout pattern.
Fig. 2 is the slab schematic layout pattern of steel billet gap approaches in the control process furnace according to the invention.
Fig. 3 is a steel billet gap approaches dynamic tracking functional flow diagram in the control process furnace according to the invention.
Fig. 4 dynamically adjusts steel billet gap approaches schema for the present invention.
Fig. 5 is that embodiment is with reference to figure.
Embodiment
Below, combine accompanying drawing that the present invention is made more detailed description with embodiment.Present embodiment only is the description to best mode for carrying out the invention, scope of the present invention is not had any restriction.
Embodiment
A kind of method of controlling steel billet gap in the process furnace, this method comprise dress steel Stroke Control, the room control of dress steel and stove figure location tracking.Dress steel motion flow is: dress steel machine is responsible for sending into the steel billet of different size in the process furnace and is heated.At first, dress steel horn is located the stokehold for slab and is just pushed away, and retreats again, and rising holds up slab, advances and delivers to the target location, returns origin position after the decline, promptly accomplishes the once steel task of adorning.Adorn the steel stroke and calculate pH-value determination pH,, an incremental pulse encoder is installed,, accomplish signal processing in the counting module at access field signal acquisition station again through shielding cable through terminal on the axle of variable-frequency motor.
Calculate cartridge plate base afterbody apart from the fixed beam afterbody apart from the time can take into account the slab gap length.Next time cartridge plate base afterbody apart from the distance of fixed beam afterbody be exactly adorned steel last time after, the position of slab on fixed beam increases along with the action of walking beam, walking beam moves several all after dates, just has the room of dress steel next time to occur on the fixed beam.If judge the room whether have be exactly through next cartridge plate base afterbody apart from the distance of fixed beam afterbody greater than 0, can judge that the room occurs.
In calculate in the room, use the distance of cartridge plate base tail layout fixed beam afterbody last time to add the distance that slab moves on fixed beam, deduct the width of slab spacing and next cartridge plate base again, can calculate the room of dress steel next time.Following formula is adopted in the control of said dress steel room:
A＝A1+A2-A3-A4(1)
Wherein,
A is the distance of next cartridge plate base apart from the fixed beam afterbody, and unit is mm;
A1 is that last piece slab is to the distance between the fixed beam afterbody on the fixed beam, and unit is mm;
Calculation formula is:
A1=dress steel machine TP-dress steel machine minimum stroke+(pressure pin length-push away just retreat coefficient * A4-push away just retreat constant) (2)
A2 is the walking beam step pitch, and unit is mm;
A3 is the slab gap, and unit is mm;
A4 is a width of plate slab.
In the present embodiment, said dress steel machine TP is 4750mm～5150mm, and said dress steel machine minimum stroke is 4750mm, and said A2 walking beam step pitch is 550, and said A4 width of plate slab is 1300mm～2300mm.
In the present embodiment, said pressure pin length is 1800mm, saidly pushes away that just to retreat coefficient be 0.67, saidly pushes away that just to retreat constant be 100.
For adjustment dress steel machine in tracing routine is set stroke; The position coordinates of final control slab in stove; Be convenient to model board briquette is calculated more accurately, in the method in steel billet gap, the mathematical model that said stove figure location tracking adopts is in described control process furnace:
s.t.d
i＝d
i-1+w
i+s
ij (3.6)
w
i＞0，i＝1，2，…N (3.3)
d
i＞0，i＝1，2，...，N (3.4)
s
ij＞0，i＝1，2，...，N，j＝0，1，...，N-1(3.5)
Wherein,
N is a slab number to be heated, and 1 to N is the coding of slab;
L is the furnace superintendent of process furnace, and unit is mm;
Q is a roller-way medullary ray fixed beam distance, and unit is mm;
C={1,2 ..., N} refers to adorn the steel room;
C
iBe the dress steel room of i piece slab, wherein 1 represent first block of slab dress steel room;
d
iBe the distance of i piece slab to monitor, d
i＞0, unit is mm;
w
iBe the width of i piece slab, w
i＞0, unit is mm;
s
IjBe the spacing of i piece slab and j piece slab, and j=i-1, s
Ij＞0, unit is mm.
In the present embodiment, N decides according to the width and the slab gap length of slab in the stove of packing into, and L is 57300mm, and Q is 3525mm.Said monitor is the exit side laser detector, leaves apart from tapping side discharging roller-way center line distance to be 4700mm.In the present embodiment, said monitor effect is to judge slab to going out stove gate, state to be come out of the stove, so its position distance is: laser detector apart from tapping side discharging roller-way center line distance from being 4700mm.
At operating terminal, according to the billet bloom size situation, the spacing that input is set is set; Calculating dynamic adjusting module through robotization PLC again calculates; With the spacing setup parameter, be uploaded to higher level's program control system simultaneously, the dress steel instruction information of redispatching after the enforcement stove figure following calculation through the communication text; At last, robotization PLC automatically performs the once steel task of adorning.
In the method in steel billet gap, it also comprises the step pitch control to walking beam in described control process furnace, and the proportional valve control system is adopted in said step pitch control, regulates the size of step pitch through the aperture of regulating proportional valve.The walking beam motion flow is specially: after the Hydraulic Station starting, the switching of respective electrical magnet valve on the control oil circuit makes the hydro-cylinder action, thereby realizes up-down, the translation of walking beam.The moving beam of walking beam does to rise, advance, descend, retreat four actions with respect to deciding beam.A cycle of operation of walking beam is formed in these four actions.Wherein, translation oil cylinder drives the action that moves forward and backward, and hoist cylinder drives rising and down maneuver, every completion one-period, blank just from loading end to discharge end certain stroke that advanced.Through multistep back and forth, blank reaches rolling needed temperature, by extractor it is sent to rolling line then and is rolled.Walking beam furnace leans on special-purpose stepping mechanism, in stove, does regular-shape motion and transfers slab.Its main action has up and-down movement and translational movement.
As shown in Figure 2, for inventing the slab schematic layout pattern of steel billet gap approaches in the said control process furnace.Wherein the inferior size of steel billet 1 (length * wide * height) is 4500mm * 2100mm * 400mm; The inferior size of steel billet 2 (length * wide * height) is 3950mm * 2300mm * 300mm, and the inferior size of steel billet 3 (length * wide * height) is 3100mm * 1300mm * 220mm, and the inferior size of steel billet 4 (length * wide * height) is 2600mm * 1750mm * 120mm; The drawing upper end is the tapping side; The lower end is dress steel side, and can calculate the steel billet clearance control according to above-mentioned formula is 1500mm at d1, and d2 is 700mm; D3 is 150mm, thereby reduces invar base gap and the mass defect of the steel slab surface that causes.Reduce the frequency that steel bonding and slab heating ununiformity takes place greatly, guaranteed the quality of slab heating, improved production efficiency.
Like Fig. 3, shown in 4, be steel billet gap approaches dynamic tracking functional flow diagram in the control process furnace according to the invention.After system starts; Dress steel machine receives the text that upper computer transmits, and text unpacks, with the spacing warehousing of slab; Obtain then charging roller table width between centers, adorn firm range and walking beam and estimate step-length; And through calculate this slab afterbody apart from fixed beam distance and next slab afterbody apart from the fixed beam distance, adorn steel machine stroke again and judge, just adorn the adjustment of steel machine stroke if meet the requirements.
In the present embodiment, said steel billet gap A3 is controlled at 100mm-8000mm.
The method in steel billet gap in the control process furnace of the present invention; Through dress steel Stroke Control, dress steel room are controlled and stove figure location tracking; Realization is dynamically adjusted and is followed the tracks of slab furnace plate blank spacing, thereby reduces invar base gap and the mass defect of the steel slab surface that causes.Reduce the frequency that steel bonding and slab heating ununiformity takes place greatly, guaranteed the quality of slab heating, improved production efficiency.
Claims (9)
1. method of controlling steel billet gap in the process furnace, this method comprises dress steel Stroke Control, the room control of dress steel and stove figure location tracking; Said dress steel room A refers to the distance of next cartridge plate base afterbody apart from the fixed beam afterbody,
Following formula is adopted in the control of said dress steel room:
A＝A1+A2-A3-A4 (1)
Wherein,
A is the distance of next cartridge plate base apart from the fixed beam afterbody, and unit is mm;
A1 is that last piece slab is to the distance between the fixed beam afterbody on the fixed beam, and unit is mm;
Calculation formula is:
A1=dress steel machine TP-dress steel machine minimum stroke+(pressure pin length-push away just retreat coefficient * A4-push away just retreat constant) (2)
A2 is the walking beam step pitch, and unit is mm;
A3 is the slab gap, and unit is mm;
A4 is a width of plate slab, and unit is mm.
At last, go out and control steel billet gap A3 in the process furnace by the above-mentioned derivation of equation,
Said steel billet gap A3 is controlled at 100mm-8000mm.
2. the method in steel billet gap is characterized in that in the control process furnace as claimed in claim 1,
Said dress steel machine TP is 4750mm～5150mm,
Said dress steel machine minimum stroke is 4750mm,
Said A2 walking beam step pitch is 550-600mm,
Said A4 width of plate slab is 1300mm～2300mm.
3. the method in steel billet gap is characterized in that said pressure pin length is 1800mm in the control process furnace as claimed in claim 1, saidly pushes away that just to retreat coefficient be 0-1, saidly pushes away that just to retreat constant be 100-200mm.
4. the method in steel billet gap is characterized in that said pressure pin length is 1800mm in the control process furnace as claimed in claim 1, saidly pushes away that just to retreat coefficient be 0.67, saidly pushes away that just to retreat constant be 100-150mm.
5. the method in steel billet gap is characterized in that in the control process furnace as claimed in claim 1, and the mathematical model that said stove figure location tracking adopts is:
s.t.d
i＝d
i-1+w
i+s
ij (3.2)
w
i＞0，i＝1，2，…N (3.3)
d
i＞0，i＝1，2，...，N (3.4)
s
ij＞0，i＝1，2，...，N，j＝0，1，...，N-1(3.5)
Wherein,
N is interior, the to be heated slab number of stove of packing into, and 1 to N is the coding of slab;
L is the furnace superintendent of process furnace, and unit is mm;
Q is a roller-way medullary ray fixed beam distance, and unit is mm;
C={1,2 ..., N} refers to adorn the steel room;
C
iBe the dress steel room of i piece slab, wherein 1 represent first block of slab dress steel room;
d
iBe the distance of i piece slab to monitor, d
i＞0, unit is mm;
w
iBe the width of i piece slab, w
i＞0, unit is mm;
s
IjBe the spacing of i piece slab and j piece slab, and j=i-1, s
Ij＞0, unit is mm.
6. the method in steel billet gap is characterized in that in the control process furnace as claimed in claim 5, and N decides according to the width and the slab gap length of slab in the stove of packing into, and L is 57300mm, and Q is 3525mm.
7. the method in steel billet gap is characterized in that said monitor is the exit side laser detector in the control process furnace as claimed in claim 5, leaves apart from tapping side discharging roller-way center line distance to be 4700mm.
8. the method in steel billet gap in the control process furnace as claimed in claim 5; It is characterized in that; Said monitor effect is to judge slab to going out stove gate, state to be come out of the stove, so its position distance is: laser detector apart from tapping side discharging roller-way center line distance from being 4700mm.
9. the method in steel billet gap is characterized in that in the control process furnace as claimed in claim 1, and it also comprises the step pitch control to walking beam, and the proportional valve control system is adopted in said step pitch control, regulates the size of step pitch through the aperture of regulating proportional valve.
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