CN102465246A - Device and method for measuring thickness of zinc layer in continuous hot galvanizing machine set - Google Patents
Device and method for measuring thickness of zinc layer in continuous hot galvanizing machine set Download PDFInfo
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- CN102465246A CN102465246A CN2010105498250A CN201010549825A CN102465246A CN 102465246 A CN102465246 A CN 102465246A CN 2010105498250 A CN2010105498250 A CN 2010105498250A CN 201010549825 A CN201010549825 A CN 201010549825A CN 102465246 A CN102465246 A CN 102465246A
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Abstract
The invention provides a device for measuring thickness of a zinc layer in a continuous hot galvanizing machine set. The continuous hot galvanizing machine set comprises an air knife, a slewing roller and a tension roller, wherein the air knife is used for performing galvanizing treatment on a steel strip, and the slewing roller and the tension roller are used for outputting the steel strip after being galvanized and cooled. The device for measuring the thickness of the zinc layer comprises a length encoder, a zinc layer thickness gauge, a steel strip length monitoring device and a zinc layer control parameter storage device, wherein the length encoder is arranged on the tension roller and is used for counting the length of the steel strip; the zinc layer thickness gauge is arranged behind the slewing roller and is used for measuring the thickness of the zinc layer; the steel strip length monitoring device is respectively connected with the length encoder and the zinc layer thickness gauge; and the zinc layer control parameter storage device is connected with the steel strip length monitoring device. The device and method for measuring the thickness of the zinc layer, provided by the invention, can be used for realizing the accurate correspondence between the thickness of the zinc layer on a specific position of the steel strip and other parameters used for controlling the thickness of the zinc layer on the position.
Description
Technical field
The present invention relates to hot dip galvanizing process, more specifically, is a kind of apparatus and method that are used for measuring in Continuous Hot Dip Galvanizing zinc coating thickness.
Background technology
Usually, the band steel can carry out zinc-plated processing before dispatching from the factory, to strengthen erosion resistance and appearance looks elegant degree.In cold rolling continuously dip coat zinc technology, utilize zinc-plated unit to accomplish zinc-plated flow process usually.Particularly, referring to Fig. 1, be the synoptic diagram that the zinc-plated unit used always carries out zinc-plated operation.As shown in the figure; Band steel 1 passes through lehre 2 after anneal; Get in the zinc pot 5 with sinking roller 6 via the stove nose that has tensioning roller 34; On band steel 1 surface after melt metal zinc is adsorbed on annealing in zinc pot 5, then, the unit surface zinc layer weight of 7 pairs of belt steel surfaces of air knife is controlled.Band steel after zinc-plated is successively through behind plating postcooling equipment 8,10,12 and the top roller 9,11; Through deflector roll 13 get into have the roller 15 that sink watch-quench tank 14 internal cooling to the aftertreatment technology temperature, and then behind rectify a deviation roller 16,17, deflector roll 18 and tensioning roller 20, export successively.
The zinc layer weight of unit surface is called for short zinc layer weight, and zinc coating thickness also commonly used is represented in the industry, is the major control index in the zinc-plated operation.When the band steel dispatched from the factory, zinc layer weight need be not less than specific preset value (the zinc-plated weight of target), to guarantee the quality of belt steel product.On the other hand, in the existing control device, still can not realize accurate control to zinc layer weight.Therefore, for guaranteeing the qualified products of dispatching from the factory, the just surperficial zinc layer weight that is plated of band tends to greater than the zinc-plated weight of target.This has caused the increase of zinc consumption and the raising of production cost.
The control of zinc coating thickness and adjusting are mainly through realizing each parameter control of air knife.For example air knife inclination angle (being the angle of air knife injection direction) with respect to belt steel surface, air knife height (being that air knife is in vertical direction apart from the distance of the liquid level of zinc pot 5), air knife spacing (being the air knife distance of distance band steel in the horizontal direction) and air knife pressure (being the pressure of the inner blowing media of air knife) etc.In actual production process, the air knife inclination angle generally is suitable under off-line state, adjusting.Therefore, as the controlled on-line means, air knife height, air knife spacing and air knife pressure are the major objective parameters as zinc coating thickness control.
At present, cold rolling Continuous Hot Dip Galvanizing generally adopts the control method based on the technology form, and binding operation personnel's manual intervention, controls zinc layer weight.The AW of zinc layer is measured through the zinc layer thickness tester 19 that is installed in behind the deflector roll 18.The technologist provides the control form corresponding to different unit speeds and the zinc-plated weight of target in advance.Corresponding to this control form, the technologist regulates controlled variable such as air knife height, air knife spacing and air knife pressure according to the actual zinc layer weight that is recorded by zinc layer thickness tester 19.But; Utilize this control method,, and be difficult to reflect the real-time change of on-the-spot state of arts because the optimization of technology list data depends on empirical accumulation; Site operation personnel's level is uneven simultaneously; Therefore the control accuracy of this method is lower, cause often limit control on the upper side of zinc layer weight in the actual production, so the zinc consumption is higher.
To the problems referred to above; Publication number is CN1610763A; Denomination of invention is the one Chinese patent application of " device of the coating weight in continuous zinc coating is handled on the control steel band "; Propose to set up mathematical model,, set control quality each parameter of air knife through the calculating of mathematical model to the variation of the zinc-plated weight of target.Simultaneously,, carry out the self-adaptation of mathematical model, to improve the precision of set-up and calculated through the observed value of zinc layer thickness tester.Yet; At the scene in the production practice; The installation site of zinc layer thickness tester and the band steel spacing between the air knife often reach more than 120 meters, and according to 80 meters/minute unit operation speed calculation, the zinc layer weight observed value has at least 1.5 minutes pure hysteresis between each item air knife controlled variable of correspondence; That is to say, at the input/output relation that does not exist between a plurality of data that synchronization collects on the direct control meaning.Because aforesaid method simply adopted the adaptive approach based on the time cycle, and ignored the hysteresis characteristic of zinc layer thickness tester, therefore, caused the truth of its adaptive effect in can not operation with corresponding air knife each item controlled variable.So, still can not reach the purpose of accurate control to actual zinc layer weight.
Therefore, need a kind of new method and apparatus that zinc coating thickness is measured, overcome above-mentioned defective.
Summary of the invention
The object of the invention; Be to provide a kind of apparatus and method that are used for measuring zinc coating thickness in Continuous Hot Dip Galvanizing; With the accurate situation of accurate each controlled variable of reflection air knife, thereby solve the problem that predictive model that above-mentioned zinc layer weight observed value and the hysteresis quality of corresponding each controlled variable of air knife bring still can't accurately be controlled zinc layer weight in particular moment.
In one aspect of the invention; A kind of device that is used for measuring in Continuous Hot Dip Galvanizing zinc coating thickness is provided; Said Continuous Hot Dip Galvanizing comprises the air knife that is used for being with steel to carry out zinc-plated processing, and is used for the deflector roll and the tensioning roller of output strip behind the plating postcooling.The device of said measurement zinc coating thickness comprises:
The length coding device, it is arranged on the said tensioning roller, is used for the length of said band steel is counted;
Zinc layer thickness tester, it is arranged at after the said deflector roll, is used for the thickness of zinc layer is measured;
Band steel length monitoring device, it is connected with zinc layer thickness tester with said length coding device respectively; And
Zinc layer controlled variable storing device, it is connected with said band steel length monitoring device;
Wherein, Said band steel length monitoring device is used in each length in the cycle; Reception is by the length-gauge numerical value of said length coding device output and the zinc coating thickness value of said zinc layer thickness tester output, and the said length-gauge numerical value that utilization receives carries out mark to the corresponding zinc coating thickness value of length in the cycle of said length-gauge numerical value.
Preferably, the length through said length coding device in the said length cycle is L/N, and wherein, L is the length of band steel between said air knife and the said zinc layer thickness tester, and N is a positive integer.
Preferably, said band steel length monitoring device is a central processing unit.
In another aspect of the present invention; A kind of method that is used for measuring in Continuous Hot Dip Galvanizing zinc coating thickness is provided; Said Continuous Hot Dip Galvanizing comprises the air knife that is used for being with steel to carry out zinc-plated processing, and is used for the deflector roll and the tensioning roller of output strip behind the plating postcooling.The method of said measurement zinc coating thickness may further comprise the steps:
On said tensioning roller, utilize the length coding device that the length of band steel is counted;
After said deflector roll, utilize zinc layer thickness tester that zinc coating thickness is measured;
, in the cycle length-gauge numerical value of said length coding device output and the zinc coating thickness value of zinc layer thickness tester output are mated in each length.
Preferably, said coupling comprises: utilize said length-gauge numerical value that said zinc coating thickness value is carried out mark, and input to zinc layer controlled variable storing device and store.
Preferably, the length through said length coding device in the said length cycle is L/N, and wherein, L is the length of band steel between said air knife and the said zinc layer thickness tester, and N is a positive integer.
Preferably; The said step that the length of band steel is counted comprises: when the head end of said band steel is counted zinc layer thickness tester through institute; The zero clearing of said length coding device also begins counting, and every through a length cycle, and the length-gauge numerical value of said length coding device increases by 1.
Preferably, this method also is included in each length in the cycle, utilizes said length-gauge numerical value a plurality of controlled variable measured in this cycle to be carried out the step of mark.These a plurality of controlled variable comprise air knife height, air knife spacing and air knife pressure.
Utilize the apparatus and method of measurement zinc coating thickness of the present invention; Can realize with the zinc coating thickness on the steel specific position; Be used for other parameter accurate corresponding of zinc coating thickness control with this position; Eliminated in the existing measurement means hysteresis quality, thereby parameter input more reliably is provided, and then realized accurate control zinc coating thickness to the zinc layer weight predictive model to the zinc coating thickness observed value; When guaranteeing the strip steel Zn-plating quality, reach the purpose that reduces the zinc consumption and reduce energy consumption and production cost.
Description of drawings
Fig. 1 is the synoptic diagram that the zinc-plated unit used always carries out zinc-plated operation;
Fig. 2 is the schematic representation of apparatus that is used for the measurement zinc coating thickness of the present invention of zinc-plated unit;
Fig. 3 is the schema of the method for measurement zinc coating thickness of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment,, more describe in detail the apparatus and method of measurement zinc coating thickness of the present invention.
As shown in Figure 2, be the schematic representation of apparatus that is used for the measurement zinc coating thickness of the present invention of zinc-plated unit.This measuring apparatus comprises length coding device 100, zinc layer thickness tester 200, band steel length monitoring device 300 and zinc layer controlled variable storing device 400.In conjunction with Fig. 1, wherein, length coding device 100 is arranged on the tensioning roller 20, is used for the length of said band steel is counted; Zinc layer thickness tester 200 is arranged at after the deflector roll 18, and the thickness (also being zinc layer weight) that is used for the zinc layer is measured; Band steel length monitoring device 300 is connected with zinc layer thickness tester 200 with length coding device 100 respectively; Zinc layer controlled variable storing device 400 is connected with band steel length monitoring device 300.
Particularly, length coding device 100 can be made up of the pulse speed measuring coder of routine, and it is installed on the main shaft of tensioning roller 20.Rotation synchronously took place in tensioning roller 20 when the band steel advanced, and provided corresponding angle of rotation (being radian) thereby drive length coding device 100.According to the girth of angle of rotation that records in the set time and tensioning roller 20, can calculate and obtain the corresponding band steel length of passing through.Every at a distance from one length cycle, length coding device 100 sends current band steel length-gauge numerical value to band steel length monitoring device 300.Concrete method of counting will more specify in following description to measuring method of the present invention.Zinc layer thickness tester 200 is made up of the thickness tester of routine, is used for the thickness of zinc layer is measured, and in the cycle, sends one-tenth-value thickness 1/10 to band steel length monitoring device 300 in each length.Band steel length monitoring device 300 is central processing unit (CPU); It is used for the length cycle is set; And can receive in the cycle by the length-gauge numerical value of length coding device 100 outputs and the zinc coating thickness value of zinc layer thickness tester 200 outputs in each length; And utilize the length-gauge numerical value receive that the corresponding zinc coating thickness value of length in the cycle of this length-gauge numerical value carried out mark, and then the zinc coating thickness value that will pass through mark is delivered to zinc layer controlled variable storing device 400.
In the above-mentioned length cycle, be meant that the band steel is through length coding device 100 or needed time of zinc layer thickness tester 200 regular lengths (being called Cycle Length).In unit running process, unit operation speed may change, therefore, understand easily, and be steady state value for guaranteeing Cycle Length, this length cycle also can change according to the variation of unit operation speed.Among the present invention, Cycle Length is arranged to the integral multiple of the length L of band steel between air knife 7 and the zinc layer thickness tester 200 for this Cycle Length, and promptly Cycle Length is L/N, and wherein, N is a positive integer.In the present invention, the selection of N and corresponding Cycle Length was preferably length cycle of under this Cycle Length, being converted between 1 to 10 second, more preferably was about 5 seconds.
Zinc layer controlled variable storing device 400 is used to store each parameter of control zinc coating thickness; Except that the actual zinc coating thickness that records by zinc layer thickness tester 200; Institute's stored parameters also comprises each parameter that is used for air knife control, comprises air knife height, air knife spacing and air knife pressure etc., for following model foundation needs; Routinely, these parameters also can comprise band steel numbering system, band steel roughness, belt steel temperature, molten zinc temperature, molten zinc-aluminium content, production rate etc.Above parameter existing conventional means all capable of using record.For example, air knife pressure can be recorded by the tensimeter on the pipeline, and the inclination angle of air knife, height and distance can record by being integrated in air knife inner angular encoder and range encoder respectively.Utilize measuring apparatus of the present invention, can carry out mark to above-mentioned each parameter, be complementary to make the actual zinc coating thickness that measures and other parameters exactly through the counting step of length coding device output.
Next, in conjunction with Fig. 3, the concrete grammar to utilizing this measuring apparatus that zinc coating thickness is measured is described in detail.
At first, in step S100, utilize length coding device 100, the length of band steel is counted.Wherein, the count cycle is the above-mentioned length cycle that is set by band steel length monitoring device 300.When the head end of every band steel of zinc-plated operation during through length coding device 100, be set at zero constantly, the count cycle begins.The band steel length mark that corresponded to for zero moment is zero, and later every through one-period, length mark increases by 1 on the basis of last one-period.When a strip steel Zn-plating finishes, during next bar strip steel Zn-plating operation beginning, length coding device 100 zero clearings, and restart counting.
In the actual zinc-plated operation,, can the welding machine that utilize end to end of front and back two band steel be welded together at zinc-plated unit inlet for guaranteeing the continuous zinc coating operation of production period.Can impact at position while welding and to be drilled with a little circular hole hole.Utilize the light transmission of this hole; But the predetermined position is provided with the optical detection device that communicates with band steel length monitoring device 300; Be used to follow the tracks of the position of the actual arrival of weld seam, and when weld seam arrived zinc layer thickness tester 200, band steel length monitoring device 300 received the signal that optical detection device sends; And further length coding device 100 is carried out clear operation, so that the length of next band steel is counted again.
Among the step S200, utilize zinc layer thickness tester 200, zinc coating thickness is measured.This step S200 and step S100 carry out simultaneously.Zinc layer thickness tester 200 measured the zinc coating thickness that it is provided with the position in the cycle in each length under the control of band steel length monitoring device 300, and is transferred to band steel length monitoring device 300.
Among the step S300, in the cycle, the length-gauge numerical value of length coding device 100 outputs and the zinc coating thickness value of zinc layer thickness tester output 200 are mated in each length.Particularly, this coupling comprises: the count value of utilizing length coding device output is to carrying out mark by the zinc coating thickness value of zinc layer thickness tester output, and inputs to zinc layer controlled variable storing device 400 and store.As previously mentioned, each length in the cycle detected coil of strip zinc layer controlled variable comprise air knife height, air knife spacing and air knife pressure etc.In each length in the cycle; These parameters that record are inputed in the zinc layer controlled variable storing device 400 store; During storage, can utilize the length-gauge numerical value in this cycle that these measured in this cycle parameter values are carried out mark through band steel length monitoring device 300.
According to above description; Because a length is in the cycle; Band steel length through length coding device 100 is set to the 1/N that is with steel length between air knife and the zinc layer thickness tester 200, therefore, counts constantly for N after above-mentioned zero length counting beginning constantly; Measured actual zinc coating thickness, corresponding with the zinc layer controlled variable of the head end position of this band steel (be zero count constantly).And at K counting constantly, measured actual zinc coating thickness, corresponding with the coil of strip zinc layer controlled variable in K-N cycle.
Therefore; Can be according to the length-gauge numerical value of length coding device 100 outputs; To be labeled as K-N at the one-tenth-value thickness 1/10 that K length recorded in the cycle, other parameter tags that simultaneously K length recorded in the cycle are K, input to zinc layer controlled variable storing device 400 then.Through search, each zinc coating thickness value can find the zinc layer controlled variable with equal length mark value.These corresponding zinc layer controlled variable can form the ordered series of numbers that is labeled as different counting steps with zinc coating thickness, to be used for follow-up modelling operation.
In addition, owing to once comprising the multi-ribbon steel in the zinc-plated operation, therefore can in this ordered series of numbers, add the band steel numbering system.In follow-up modelling operation, the band steel numbering system can be as index field in the data search process with band steel length.Because the air knife controlled variable of band steel length specific position; The actual zinc coating thickness that comprises this position; Can be reflected exactly, therefore, behind these parameters input zinc layer weight predictive models; Can more accurately regulate, to eliminate follow-up actual zinc layer weight and the deviation between the zinc layer weight target value substantially each controlled variable of air knife.
In sum; Utilize the apparatus and method of measurement zinc coating thickness of the present invention; Can realize with the zinc coating thickness on the steel specific position, be used for other parameter accurate corresponding of zinc coating thickness control, eliminate in the existing measurement means hysteresis quality the zinc coating thickness observed value with this position; Thereby parameter input more reliably is provided to the zinc layer weight predictive model; And then realize accurate control to zinc coating thickness, when guaranteeing the strip steel Zn-plating quality, reach the purpose that reduces the zinc consumption and reduce energy consumption and production cost.
Claims (9)
1. device that is used for measuring zinc coating thickness in Continuous Hot Dip Galvanizing; Said Continuous Hot Dip Galvanizing comprises the air knife that is used for being with steel to carry out zinc-plated processing; And the deflector roll and the tensioning roller that are used for output strip behind the plating postcooling; It is characterized in that the device of said measurement zinc coating thickness comprises:
The length coding device, it is arranged on the said tensioning roller, is used for the length of said band steel is counted;
Zinc layer thickness tester, it is arranged at after the said deflector roll, is used for the thickness of zinc layer is measured;
Band steel length monitoring device, it is connected with zinc layer thickness tester with said length coding device respectively; And
Zinc layer controlled variable storing device, it is connected with said band steel length monitoring device;
Wherein, Said band steel length monitoring device is used in each length in the cycle; Reception is by the length-gauge numerical value of said length coding device output and the zinc coating thickness value of said zinc layer thickness tester output, and the said length-gauge numerical value that utilization receives carries out mark to the corresponding zinc coating thickness value of length in the cycle of said length-gauge numerical value.
2. the device that is used for measuring zinc coating thickness according to claim 1 in Continuous Hot Dip Galvanizing; It is characterized in that the length through said length coding device in the said length cycle is L/N, wherein; L is the length of band steel between said air knife and the said zinc layer thickness tester, and N is a positive integer.
3. the device that is used for measuring in Continuous Hot Dip Galvanizing zinc coating thickness according to claim 1 and 2 is characterized in that said band steel length monitoring device is a central processing unit.
4. method that is used for measuring zinc coating thickness in Continuous Hot Dip Galvanizing; Said Continuous Hot Dip Galvanizing comprises the air knife that is used for being with steel to carry out zinc-plated processing; And the deflector roll and the tensioning roller that are used for output strip behind the plating postcooling; It is characterized in that the method for said measurement zinc coating thickness may further comprise the steps:
On said tensioning roller, utilize the length coding device that the length of band steel is counted;
After said deflector roll, utilize zinc layer thickness tester that zinc coating thickness is measured;
, in the cycle length-gauge numerical value of said length coding device output and the zinc coating thickness value of zinc layer thickness tester output are mated in each length.
5. the method that is used for measuring zinc coating thickness according to claim 4 in Continuous Hot Dip Galvanizing; It is characterized in that; Said coupling comprises: utilize said length-gauge numerical value that said zinc coating thickness value is carried out mark, and input to zinc layer controlled variable storing device and store.
6. according to claim 4 or the 5 described methods that are used for measuring zinc coating thickness in Continuous Hot Dip Galvanizing; It is characterized in that the length through said length coding device in the said length cycle is L/N, wherein; L is the length of band steel between said air knife and the said zinc layer thickness tester, and N is a positive integer.
7. the method that is used for measuring zinc coating thickness according to claim 6 in Continuous Hot Dip Galvanizing; It is characterized in that; The said step that the length of band steel is counted comprises: when the head end of said band steel is counted zinc layer thickness tester through institute; The zero clearing of said length coding device also begins counting, and every through a length cycle, and the length-gauge numerical value of said length coding device increases by 1.
8. the method that is used for measuring zinc coating thickness according to claim 7 in Continuous Hot Dip Galvanizing; It is characterized in that; Also be included in each length in the cycle, utilize said length-gauge numerical value a plurality of controlled variable measured in this cycle to be carried out the step of mark.
9. the method that is used for measuring in Continuous Hot Dip Galvanizing zinc coating thickness according to claim 8 is characterized in that said a plurality of controlled variable comprise air knife height, air knife spacing and air knife pressure.
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| CN102928440A (en) * | 2012-10-30 | 2013-02-13 | 鞍钢股份有限公司 | Galvanized finished product steel plate hole defect monitoring method |
| CN103397300A (en) * | 2013-08-06 | 2013-11-20 | 中国钢研科技集团有限公司 | Multifunctional experiment device and method for deposition of zinc alloy coating |
| CN104034247A (en) * | 2014-05-15 | 2014-09-10 | 中冶连铸技术工程有限责任公司 | Strip-steel length metering method |
| CN104826881A (en) * | 2015-05-26 | 2015-08-12 | 河南省淅川县有色金属压延有限公司 | Automatic purging system and method for aluminum strip mill |
| CN106756700A (en) * | 2016-11-18 | 2017-05-31 | 首钢京唐钢铁联合有限责任公司 | A kind of control method and device of zinc coating thickness |
| CN110629149A (en) * | 2019-10-21 | 2019-12-31 | 中冶南方工程技术有限公司 | Zinc layer thickness control device of hot galvanizing unit |
| CN114959536A (en) * | 2022-05-29 | 2022-08-30 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling thickness of galvanized layer |
| CN115094364A (en) * | 2022-06-20 | 2022-09-23 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling thickness of zinc layer of strip steel of galvanizing production line |
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| CN102928440A (en) * | 2012-10-30 | 2013-02-13 | 鞍钢股份有限公司 | Galvanized finished product steel plate hole defect monitoring method |
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| CN103397300B (en) * | 2013-08-06 | 2016-01-20 | 中国钢研科技集团有限公司 | A kind of deposition zinc alloy layer multifunction experiment apparatus and method thereof |
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| CN106756700A (en) * | 2016-11-18 | 2017-05-31 | 首钢京唐钢铁联合有限责任公司 | A kind of control method and device of zinc coating thickness |
| CN110629149A (en) * | 2019-10-21 | 2019-12-31 | 中冶南方工程技术有限公司 | Zinc layer thickness control device of hot galvanizing unit |
| CN114959536A (en) * | 2022-05-29 | 2022-08-30 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling thickness of galvanized layer |
| CN114959536B (en) * | 2022-05-29 | 2024-05-10 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling thickness of galvanized zinc layer |
| CN115094364A (en) * | 2022-06-20 | 2022-09-23 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling thickness of zinc layer of strip steel of galvanizing production line |
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