CN102465246B - 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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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 for measure the apparatus and method of zinc coating thickness in Continuous Hot Dip Galvanizing.
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 continuous hot dip galvanizing process, usually utilize zinc-plated unit to complete zinc-plated flow process.Particularly, referring to Fig. 1, be the schematic diagram that the zinc-plated unit commonly used carries out zinc-plated operation.As shown in the figure, band steel 1 passes through annealing furnace 2 after anneal, enter in the zinc pot 5 with sinking roller 6 via the stove nose 4 with tensioning roller 3, on band steel 1 surface after the metallic zinc of melting 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 successively by the plating after cooling apparatus 8,10,12 and top roller 9,11 after, in entering watch-quench tank 14 with sinking roller 15, deflector roll 13 are cooled to the aftertreatment technology temperature, and then output after deviation rectification roller 16,17, deflector roll 18 and tensioning roller 20 successively.
The zinc layer weight of unit surface is called for short zinc layer weight, and also zinc coating thickness commonly used represents in the industry, is the major control index in 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 existing control device, still can not realize accurate control to zinc layer weight.Therefore, for the product of guaranteeing to dispatch from the factory is qualified, band is the zinc layer weight that plates of surface just, 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 mainly realize by the control to each parameter of air knife.For example air knife inclination angle (being that the air knife injection direction is with respect to the angle of 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 nozzle gap (be air knife distance with the distance of steel) in the horizontal direction and air 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 for adjusting under off-line state.Therefore, as the on-line Control means, air knife height, air knife nozzle gap and air pressure are the major objective parameters of controlling as zinc coating thickness.
At present, cold rolling Continuous Hot Dip Galvanizing generally adopts the control method based on the technique form, and binding operation personnel's manual intervention, controls zinc layer weight.The actual weight of zinc layer is measured by the zinc layer thickness tester 19 that is arranged on after deflector roll 18.The technologist provides the control form corresponding to different unit speeds and the zinc-plated weight of target in advance.Control form corresponding to this, the technologist regulates control parameters such as air knife height, air knife nozzle gap and air pressures according to the actual zinc layer weight that is recorded by zinc layer thickness tester 19.But, utilize this control method, depend on the accumulation of experience due to the optimization of technique list data, and be difficult to reflect the real-time change of site technique situation, site operation personnel's level is uneven simultaneously, therefore the control accuracy of the method is lower, cause often limit control on the upper side of zinc layer weight in actual production, so the zinc consumption is higher.
For the problems referred to above, publication number is CN1610763A, denomination of invention is the Chinese patent application of " device of controlling the coating weight on steel band in continuous zinc coating is processed ", proposition is set up mathematical model for the variation of the zinc-plated weight of target, by the calculating of mathematical model, set the control quality to each parameter of air knife.Simultaneously, by the observed value of zinc layer thickness tester, carry out the self-adaptation of mathematical model, set to improve the precision of calculating.Yet, at the scene in production practice, the installation site of zinc layer thickness tester and the band steel spacing between air knife often reach more than 120 meters, calculate according to the unit operation speed of 80 m/mins, the zinc layer weight observed value is controlled between parameter in every air knife of correspondence and is had the pure hysteresis of at least 1.5 minutes, that is to say, at the input/output relation that does not exist between a plurality of data that synchronization collects on direct control meaning.Simply adopt the adaptive approach in time-based cycle due to aforesaid method, and ignored the hysteresis characteristic of zinc layer thickness tester with the every control parameter of corresponding air knife, therefore, caused the truth of its adaptive effect in can not operation.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 defects.
Summary of the invention
Purpose of the present invention, be to provide a kind of for measure the apparatus and method of zinc coating thickness in Continuous Hot Dip Galvanizing, respectively control parameter in the accurate situation of particular moment with accurate reflection air knife, respectively control predictive model that the hysteresis quality of parameter brings and still can't carry out the problem accurately controlled to zinc layer weight thereby solve above-mentioned zinc layer weight observed value and corresponding air knife.
In one aspect of the invention, provide a kind of for measure the device of zinc coating thickness in Continuous Hot Dip Galvanizing, described Continuous Hot Dip Galvanizing comprises for to carrying out the air knife of zinc-plated processing with steel, and the deflector roll and the tensioning roller that are used for output strip after cooling after plating.The device of described measurement zinc coating thickness comprises:
The length coding device, it is arranged on described tensioning roller, is used for described length with steel is counted;
Zinc layer thickness tester after it is arranged at described 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 described length coding device respectively; And
The zinc layer is controlled parameter memory, and it is connected with described band steel length monitoring device;
Wherein, described band steel length monitoring device is used in each length in the cycle, reception is by the length-gauge numerical value of described length coding device output and the zinc coating thickness value of described zinc layer thickness tester output, and the described length-gauge numerical value that utilization receives carries out mark to the zinc coating thickness value of length in the cycle corresponding to described length-gauge numerical value.
Preferably, the length through described length coding device in the described length cycle is L/N, wherein, L be between described air knife and described zinc layer thickness tester with the length of steel, N is positive integer.
Preferably, described band steel length monitoring device is central processing unit.
In another aspect of the present invention, provide a kind of for measure the method for zinc coating thickness in Continuous Hot Dip Galvanizing, described Continuous Hot Dip Galvanizing comprises for to carrying out the air knife of zinc-plated processing with steel, and the deflector roll and the tensioning roller that are used for output strip after cooling after plating.The method of described measurement zinc coating thickness comprises the following steps:
On described tensioning roller, utilize the length coding device that the length with steel is counted;
After described deflector roll, utilize zinc layer thickness tester that zinc coating thickness is measured;
, in the cycle length-gauge numerical value of described length coding device output and the zinc coating thickness value of zinc layer thickness tester output are mated in each length.
Preferably, described coupling comprises: utilize described length-gauge numerical value to carry out mark to described zinc coating thickness value, and input to the zinc layer and control parameter memory and store.
Preferably, the length through described length coding device in the described length cycle is L/N, wherein, L be between described air knife and described zinc layer thickness tester with the length of steel, N is positive integer.
Preferably, described the step of counting with the length of steel is comprised: when described head end with steel is counted zinc layer thickness tester through institute, the zero clearing of described length coding device also begins counting, and every through a length cycle, and the length-gauge numerical value of described length coding device increases by 1.
Preferably, the method also is included in each length in the cycle, utilizes described length-gauge numerical value a plurality of control parameters measured in this cycle to be carried out the step of mark.These a plurality of control parameters comprise air knife height, air knife nozzle gap and air 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 the accurate corresponding of other parameter that zinc coating thickness controls with this position, eliminated in existing measurement means the hysteresis quality to the zinc coating thickness observed value, thereby provide more reliable parameter input to the zinc layer weight predictive model, and then realization is to the accurate control of 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.
Description of drawings
Fig. 1 is the schematic diagram that the zinc-plated unit commonly used carries out zinc-plated operation;
Fig. 2 is the schematic diagram for the device of 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 the drawings and specific embodiments, the apparatus and method to measurement zinc coating thickness of the present invention are described in more detail.
As shown in Figure 2, be schematic diagram for the device of 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 control parameter memory 400.In conjunction with Fig. 1, wherein, length coding device 100 is arranged on tensioning roller 20, is used for described length with steel is counted; After zinc layer thickness tester 200 is arranged at deflector roll 18, be used for the thickness (being also zinc layer weight) of zinc layer is measured; Band steel length monitoring device 300 is connected with zinc layer thickness tester 200 with length coding device 100 respectively; The zinc layer is controlled parameter memory 400 and is connected with band steel length monitoring device 300.
Particularly, length coding device 100 can be comprised of the pulse speed measuring coder of routine, and it is arranged on the main shaft of tensioning roller 20.When the band steel advances, synchronous rotary occurs in tensioning roller 20, provides corresponding angle of rotation (being radian) thereby drive length coding device 100.According to the girth of the 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 the length cycle of one, length coding device 100 sends current band steel length-gauge numerical value to band steel length monitoring device 300.Concrete method of counting will in following description to measuring method of the present invention, be described in more detail.Zinc layer thickness tester 200 is made 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 in each length 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, and utilize the length-gauge numerical value that receives to carry out mark to the zinc coating thickness value of length in the cycle corresponding to this length-gauge numerical value, and then will be delivered to through the zinc coating thickness value of mark zinc layer control parameter memory 400.
In the above-mentioned length cycle, refer to be with steel to pass 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, easily understand, and be steady state value for guaranteeing Cycle Length, this length cycle also can change according to the variation of unit operation speed.In the present invention, Cycle Length is arranged between air knife 7 and zinc layer thickness tester 200 with the length L of the steel integral multiple for this Cycle Length, and namely Cycle Length is L/N, and wherein, N is positive integer.In the present invention, the selection of N and corresponding Cycle Length was preferably length cycle of converting between 1 to 10 second under this Cycle Length, be more preferably about 5 seconds.
The zinc layer is controlled parameter memory 400 and is used for the parameters that zinc coating thickness is controlled in storage, except the actual zinc coating thickness that is recorded by zinc layer thickness tester 200, the parameter of storing also comprises the parameters of controlling for air knife, comprise air knife height, air knife nozzle gap and air pressure etc., setting up for following model 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 all can utilize existing conventional means to record.For example, air pressure can be recorded by the tensimeter on pipeline, and the inclination angle of air knife, height and distance can be respectively recorded by the angular encoder and the range encoder that are integrated in air knife inside.Utilize measuring apparatus of the present invention, can carry out mark to above-mentioned each parameter by the counting step of length coding device output, be complementary to make exactly the actual zinc coating thickness that measures and other parameters.
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 with steel is counted.Wherein, the count cycle is the above-mentioned length cycle by setting with steel length monitoring device 300.During through length coding device 100, be set as zero constantly when the head end of every band steel of zinc-plated operation, 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 increased by 1 on the basis in a upper cycle.During, next strip steel Zn-plating operation beginning complete when strip steel Zn-plating, 100 zero clearings of length coding device, and restart counting.
In actual zinc-plated operation, for guaranteeing the continuous zinc coating operation of production period, the welding machine that utilizes end to end of front and back two band steel can be welded together at zinc-plated unit entrance.Can impact at position while welding and be drilled with a little circular hole hole.Utilize the light transmission of this hole, but the predetermined position arranges and the optical detection device that communicates with steel length monitoring device 300, be used for following the tracks of the position of the actual arrival of weld seam, and when weld seam arrives zinc layer thickness tester 200, receive with steel length monitoring device 300 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.
In 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 under the control with steel length monitoring device 300, each length in the cycle zinc coating thickness to its setting position place measure, and be transferred to band steel length monitoring device 300.
In step S300,, in the cycle 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 the zinc layer and control parameter memory 400 and store.As previously mentioned, the coil of strip zinc layer that detects in the cycle of each length is controlled parameter and is comprised air knife height, air knife nozzle gap and air pressure etc.In each length in the cycle, these parameters that record are inputed in zinc layer control parameter memory 400 store, during storage, can by band steel length monitoring device 300, utilize the length-gauge numerical value in this cycle to carry out mark to these parameter values measured in this cycle.
According to above description, because a length is in the cycle, be set between air knife and zinc layer thickness tester 200 1/N with steel length through length coding device 100 with steel length, therefore, N counting after above-mentioned zero length counting beginning constantly constantly, measured actual zinc coating thickness, to control parameter corresponding with the zinc layer 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 control parameter in K-N cycle.
Therefore, can be according to the length-gauge numerical value of length coding device 100 outputs, to be labeled as at the one-tenth-value thickness 1/10 that K length recorded in the cycle K-N, other parameter tags that simultaneously K length recorded in the cycle are K, then input to the zinc layer and control parameter memory 400.By search, each zinc coating thickness value can find the zinc layer with equal length mark value and control parameter.These corresponding zinc layers are controlled parameter can form from zinc coating thickness the ordered series of numbers that is labeled as different counting steps, sets up operation to be used for follow-up model.
In addition, owing to comprising the multi-ribbon steel in zinc-plated operation once, therefore can add in this ordered series of numbers and be with steel numbering system.Set up in operation at follow-up model, band steel numbering system and band steel length can be as index fields in the data search process.Because the air knife with steel length specific position is controlled parameter, the actual zinc coating thickness that comprises this position, can be reflected exactly, therefore, after these parameter input zinc layer weight predictive models, can more accurately regulate the parameter of respectively controlling of air knife, to eliminate substantially follow-up actual zinc layer weight and the deviation between the zinc layer weight target value.
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 the accurate corresponding of other parameter that zinc coating thickness controls with this position, eliminated in existing measurement means the hysteresis quality to the zinc coating thickness observed value, thereby provide more reliable parameter input to the zinc layer weight predictive model, and then realization is to the accurate control of 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 (7)
1. device that is used for measuring in Continuous Hot Dip Galvanizing zinc coating thickness, described Continuous Hot Dip Galvanizing comprises for to carry out the air knife of zinc-plated processing with steel, and the deflector roll and the tensioning roller that are used for output strip after cooling after plating, it is characterized in that, the device of described measurement zinc coating thickness comprises:
The length coding device, it is arranged on described tensioning roller, is used for described length with steel is counted;
Zinc layer thickness tester after it is arranged at described 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 described length coding device respectively; And
The zinc layer is controlled parameter memory, and it is connected with described band steel length monitoring device;
Wherein, described band steel length monitoring device is used in each length in the cycle, reception is by the length-gauge numerical value of described length coding device output and the zinc coating thickness value of described zinc layer thickness tester output, and utilize the described length-gauge numerical value that receives to carry out mark to the zinc coating thickness value of length in the cycle corresponding to described length-gauge numerical value, and, length through described length coding device in the described length cycle is L/N, wherein, L be between described air knife and described zinc layer thickness tester with the length of steel, N is positive integer.
2. according to claim 1ly it is characterized in that for measure the device of zinc coating thickness in Continuous Hot Dip Galvanizing, described band steel length monitoring device is central processing unit.
3. method that is used for measuring in Continuous Hot Dip Galvanizing zinc coating thickness, described Continuous Hot Dip Galvanizing comprises for to carry out the air knife of zinc-plated processing with steel, and the deflector roll and the tensioning roller that are used for output strip after cooling after plating, it is characterized in that, the method for described measurement zinc coating thickness comprises the following steps:
On described tensioning roller, utilize the length coding device that the length with steel is counted;
After described deflector roll, utilize zinc layer thickness tester that zinc coating thickness is measured;
In each length in the cycle, the length-gauge numerical value of described length coding device output and the zinc coating thickness value of zinc layer thickness tester output are mated, and, length through described length coding device in the described length cycle is L/N, wherein, L be between described air knife and described zinc layer thickness tester with the length of steel, N is positive integer.
4. according to claim 3 for measure the method for zinc coating thickness in Continuous Hot Dip Galvanizing, it is characterized in that, described coupling comprises: utilize described length-gauge numerical value to carry out mark to described zinc coating thickness value, and input to the zinc layer and control parameter memory and store.
5. according to claim 4 for measure the method for zinc coating thickness in Continuous Hot Dip Galvanizing, it is characterized in that, described the step of counting with the length of steel is comprised: when described head end with steel is counted zinc layer thickness tester through institute, the zero clearing of described length coding device also begins counting, and every through a length cycle, the length-gauge numerical value of described length coding device increases by 1.
6. according to claim 5 for measure the method for zinc coating thickness in Continuous Hot Dip Galvanizing, it is characterized in that, also be included in each length in the cycle, utilize described length-gauge numerical value a plurality of control parameters measured in this cycle to be carried out the step of mark.
7. according to claim 6ly it is characterized in that for measure the method for zinc coating thickness in Continuous Hot Dip Galvanizing, described a plurality of control parameters comprise air knife height, air knife nozzle gap and air pressure.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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 |
| CN104034247B (en) * | 2014-05-15 | 2016-09-14 | 中冶连铸技术工程有限责任公司 | A kind of metering method of strip length |
| CN104826881B (en) * | 2015-05-26 | 2016-08-24 | 河南省淅川县有色金属压延有限公司 | A kind of aluminium plate band rolling mill automatic blowing system and method |
| 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 |
| CN110629149B (en) * | 2019-10-21 | 2021-09-28 | 中冶南方工程技术有限公司 | Zinc layer thickness control device of hot galvanizing unit |
| 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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| US20040050323A1 (en) * | 2001-08-24 | 2004-03-18 | Hong-Kook Chae | Apparatus for controlling coating weight on strip in continuous galvanizing process |
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