CN102090705B - Method for improving tobacco-drying process capability - Google Patents
Method for improving tobacco-drying process capability Download PDFInfo
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Abstract
The invention relates to a method for improving the tobacco-drying process capability. The method comprises the following steps of: acquiring raw data of a plurality of process parameters of a tobacco-drying process; according to the raw data, calculating the process capability index of all process parameters respectively; according to a preset process capability evaluation function, converting the process capability indexes to obtain process capability evaluation values; performing weighted average of the obtained process capability evaluation values to obtain the batch process capability evaluation value of the current batch; and judging whether the batch process capability evaluation value reaches the preset threshold value, if the batch process capability evaluation value does not reach the preset threshold value, checking whether the process capability evaluation values of all process parameters of the current batch reach the preset threshold value and performing optimal operation of the process parameters, of which the process capability evaluation values do not reach the preset threshold value. In the method, the batch process capability evaluation value of the current batch is obtained by calculating the dispersibility of the characteristic values of all process parameters of the tobacco-drying process to determine the batch having problems, and the process parameters having defects are traced, so that a solid foundation is provided for technicians to adjust and optimize the tobacco-drying process.
Description
Technical field
The present invention relates to cigarette primary processing processing cut tobacco dry technology, relate in particular to the method that improves tobacco-drying process capability.
Background technology
In Cigarette processing throwing link, drying process is the core process of throwing process, its treatment effect directly affects the cigarette product quality, therefore stablize a baking silk technological parameter, reach baking silk production engineering specifications, improve baking silk process capability, have great importance to improving cigarette product quality and stability.
Existing evaluation to baking silk effect is based on determines its accordance to the cut tobacco of tobacco-dryer exit in the mode of sampling inspection, according to result of sampling inspection baking silk technological parameter is optimized.Because existing process parameter optimizing is based on the result to drying process outlet cut tobacco sampling Detection, and consequently the effect of the multinomial technological parameter comprehensive function of drying process embodies, its sample detection result's qualification rate can not embody each technological parameter of drying process fully in the control effect of whole production process, carrying out technical process control optimization needs the technical staff to have more rich experience can to find out the exact cause and provide corresponding solution, and for the more shallow technical staff of experience, then obviously very difficult, often need to expend more man-hour and carry out repetition test that good effect of optimization can be arranged, this must increase human cost and the time cost of optimizing process.
Summary of the invention
The objective of the invention is to propose a kind of method that improves tobacco-drying process capability, in time find the weak link in the baking silk technical process, and instruct according to this process modification and optimized device to control, thereby so that optimizing process is no longer dependent on veteran technical staff, and human cost and time cost have been reduced.
For achieving the above object, the invention provides a kind of method that improves tobacco-drying process capability, comprising:
Gather the initial data of the multinomial technological parameter of drying process;
Calculate respectively the Measure of Process Capability of various process parameters according to the initial data of described multinomial technological parameter;
According to default process capability evaluation function the Measure of Process Capability of various process parameters is estimated, obtained the process capability evaluation value of various process parameters;
Process capability evaluation value to described various process parameters is weighted on average, obtains current batch batch process capability evaluation value;
Judge whether a described current batch batch process capability evaluation value reaches predetermined threshold value, if do not reach predetermined threshold value, whether the process capability evaluation value that then checks the various process parameters in described current batch reaches predetermined threshold value, and the technological parameter implementation that does not reach predetermined threshold value is adjusted accordingly and control optimization.
Further, described multinomial technological parameter comprises: the outlet moisture content of cut tobaccos of cut-tobacco drier, barrel pressure, discharging cover negative pressure, electric weigher flow, entrance moisture content of cut tobaccos and hot blast temperature.
Further, add temporary in the process capability evaluation value to described various process parameters, the size of the weight of various process parameters is by the order ordering of outlet moisture content of cut tobaccos, barrel pressure, discharging cover negative pressure, electric weigher flow, entrance moisture content of cut tobaccos and hot blast temperature.
Further, the slope of curve of described process capability evaluation function in each segmentation span of Measure of Process Capability is different, and the slope of curve of the segmentation that wherein span is less is greater than the slope of curve of the larger segmentation of span.
Further, at Measure of Process Capability [0,0.83] slope of a curve that fits to of functional value corresponding to segmentation is higher than Measure of Process Capability (0.83,1.67] slope of a curve that fits to of functional value corresponding to segmentation, Measure of Process Capability is [0,1.67] slope of a curve that fits to of functional value corresponding to segmentation is positive number, when the process Capability index greater than 1.67, then corresponding functional value is the preset maximum value of process capability evaluation value.
Further, the operation that calculates corresponding Measure of Process Capability of described initial data according to technological parameter specifically comprises:
Calculate the average of described technological parameter and mark inclined to one side according to the sampled value in the initial data of technological parameter and hits;
According to average and inclined to one side process capability and the process accuracy of calculating in the steady-state process of mark of described technological parameter, wherein said process capability represents the discrete case that data distribute, and described process accuracy represents that the data overall distribution departs from situation in the steady-state process;
Calculate Measure of Process Capability according to the process capability in the steady-state process and process accuracy.
Further, when batch process capability evaluation value of calculating current batch, process capability evaluation value and the process capability evaluation value corresponding to defective pipe tobacco time of described various process parameters is weighted on average.
Further, add temporary in the process capability evaluation value to described various process parameters and defective pipe tobacco time, the size of the weight of various process parameters is by the order ordering of outlet moisture content of cut tobaccos, barrel pressure, discharging cover negative pressure, defective pipe tobacco time, electric weigher flow, entrance moisture content of cut tobaccos and hot blast temperature.
Further, the described defective pipe tobacco time, corresponding process capability evaluation value drew by defective pipe tobacco time course merit rating function calculation, the defective pipe tobacco time at [A, B] time the corresponding functional value slope of a curve that fits to be negative, when the defective pipe tobacco time greater than B, then corresponding functional value is the predetermined minimum of process capability evaluation value, when the defective pipe tobacco time less than A, then corresponding functional value is the preset maximum value of process capability evaluation value.
Further, the interval of time A is [0,200s], and the interval of time B is [150s, 500s].
Further, the described defective pipe tobacco time is the summation of time, fracture time and the overproof time of process of the stub bar that produces of outlet moisture content of cut tobaccos, material tail in batch production process.
Further, the operation of the initial data of the multinomial technological parameter of described collection drying process specifically comprises:
When the electric weigher Seize ACK message occurs, and when the outlet moisture content of cut tobaccos is not less than default moisture content of cut tobaccos value, described outlet moisture content of cut tobaccos carried out current batch data sampling, and disappear at the electric weigher Seize ACK message, and after the outlet moisture content of cut tobaccos is lower than described default moisture content of cut tobaccos value, stop the data sampling to described outlet moisture content of cut tobaccos;
When the electric weigher Seize ACK message occurs, and when barrel pressure is not less than preset pressure value, perhaps behind the Preset Time when the electric weigher Seize ACK message occurs, described barrel pressure carried out current batch data sampling, and disappear at the electric weigher Seize ACK message, and after barrel pressure is lower than described preset pressure value, stop the data sampling to described barrel pressure;
Behind the Preset Time when the electric weigher Seize ACK message occurs, described discharging cover negative pressure is carried out current batch data sampling, and behind the Preset Time when the electric weigher Seize ACK message disappears, stop the data sampling to described discharging cover negative pressure;
When the electric weigher Seize ACK message occurs, described electric weigher flow is carried out current batch data sampling, and when the electric weigher Seize ACK message disappears, stop the data sampling to described electric weigher flow;
When the entrance moisture content of cut tobaccos is not less than default entrance moisture content of cut tobaccos value, or behind the Preset Time when the electric weigher Seize ACK message occurs, described entrance moisture content of cut tobaccos carried out current batch data sampling, and when the entrance moisture content of cut tobaccos is lower than default entrance moisture content of cut tobaccos value, stop the data sampling to described entrance moisture content of cut tobaccos;
Behind the Preset Time when the electric weigher Seize ACK message occurs, described hot blast temperature is carried out current batch data sampling, and behind the Preset Time when the electric weigher Seize ACK message disappears, stop the data sampling to described hot blast temperature.
Further, the acquisition operations of defective pipe tobacco time is specially:
When the electric weigher Seize ACK message occurs, the outlet moisture content of cut tobaccos is not less than preset value to the time of the default index lower limit of outlet moisture content of cut tobaccos, and when the electric weigher Seize ACK message disappears, be limited to the time of described preset value under the default index of record outlet moisture content of cut tobaccos, also comprise the time that moisture content of cut tobaccos leaves the positive and negative tolerance of default index that exports when the electric weigher Seize ACK message takies.
Further, above-mentioned preset value refers to the outlet moisture content of cut tobaccos preset, is limited to the value that default index deducts franchise under the These parameters.
Based on technique scheme, the present invention has changed existing evaluation to baking silk effect and has been based on the method for the cut tobacco of tobacco-dryer exit being determined its accordance in the mode of sampling inspection, but adopt the characteristic value deployment conditions of various process parameters in the drying process is calculated, and obtain current batch batch process capability evaluation value by average weighted mode, whether reach requirement by a batch process capability evaluation value of judging current batch and come problem identificatioin batch, again the concrete technology parameter in the problem batch is reviewed, determine to exist in the technical process technological parameter of defective, thereby for the technical staff carries out the technique adjustment and controls to optimize providing foundation, result of the test to prove that also the present invention can reach the effect that improves tobacco-drying process capability really.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of an embodiment of the present invention's method of improving tobacco-drying process capability.
Fig. 2 is the matched curve schematic diagram that the present invention improves process capability evaluation function in the embodiment of the method for tobacco-drying process capability.
Fig. 3 is the matched curve schematic diagram that the present invention improves defective pipe tobacco time course merit rating function in the embodiment of the method for tobacco-drying process capability.
The specific embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
At first the term that relates among the present invention is provided definition.The process that refers to process capability satisfies the ability of specification requirement, specific to referring on the operation that operation is in the actual working ability under the stable state, namely guarantees the ability of product quality.Here the operation of indication refers to the process of five gross combined factors effects such as operator, machine, raw material, process and production environment, namely the production process of product quality.Product quality is exactly the general performance of each qualitative factor role in the operation.For any production process, product quality always exists dispersedly.If the process capability of operation is higher, then the dispersion of product quality characteristics value will be less; If the process capability of operation is lower, then the dispersion of product quality characteristics value will be larger.Measure of Process Capability refers to that operation is in the actual working ability under the stable state within a certain period of time.
The process capability evaluation value be by Measure of Process Capability by the value that nonlinear model conversion draws, can determine whether technological parameter has problems according to the process capability evaluation value, also can affect simultaneously the degree of priority of each technological parameter in the optimizing process.
Batch process capability evaluation value is the value that the process capability evaluation value by a plurality of technological parameters in certain batch draws by weighted average, whether by up to standard with the process capability that relatively comes to determine this batch of predetermined threshold value, the raising by this batch process capability evaluation value is also as the embodiment of effect of optimization.
As shown in Figure 1, improve the schematic flow sheet of an embodiment of the method for tobacco-drying process capability for the present invention.Present embodiment may further comprise the steps:
The initial data of the multinomial technological parameter of step 101, collection drying process;
If step 106 does not reach predetermined threshold value, check then whether the process capability evaluation value of the various process parameters in described current batch reaches predetermined threshold value, and the technological parameter that does not reach predetermined threshold value is carried out adjusting operation.
In the present embodiment, take more widely used drum-type drying process as example, the selection of technological parameter can be selected according to technical staff's needs, and determines the weight that each technological parameter is corresponding according to each technological parameter in the influence degree of product quality.For instance, technological parameter can comprise: the outlet moisture content of cut tobaccos of drum-type cut-tobacco drier, barrel pressure, discharging cover negative pressure, electric weigher flow, entrance moisture content of cut tobaccos and hot blast temperature etc., but be not limited to above for example, the technical staff can add technological parameter or delete as required.
Add temporary in the process capability evaluation value to various process parameters, the size of the weight of various process parameters (weight of permission technological parameter is identical) can sort according to importance, for example by the like this order ordering of outlet moisture content of cut tobaccos, barrel pressure, discharging cover negative pressure, electric weigher flow, entrance moisture content of cut tobaccos and hot blast temperature, when environment changes, the magnitude relationship of this weight may change, and can be carried out as required by the technical staff adjustment of order.
When the initial data of the multinomial technological parameter that gathers the drum-type drying process, acquisition mode also can be adjusted as required by the technical staff, for example for the collection of initial data of outlet moisture content of cut tobaccos, can be when the electric weigher Seize ACK message occurs, and when the outlet moisture content of cut tobaccos is not less than default moisture content of cut tobaccos value, the outlet moisture content of cut tobaccos is carried out current batch data sampling, and disappear at the electric weigher Seize ACK message, and after the outlet moisture content of cut tobaccos is lower than described default moisture content of cut tobaccos value, stop the data sampling to described outlet moisture content of cut tobaccos.
Collection for the initial data of barrel pressure, can be when the electric weigher Seize ACK message occurs, and when barrel pressure is not less than preset pressure value, perhaps behind the Preset Time when the electric weigher Seize ACK message occurs, described barrel pressure carried out current batch data sampling, and disappear at the electric weigher Seize ACK message, and after barrel pressure is lower than described preset pressure value, stop the data sampling to described barrel pressure.
Collection for the initial data of discharging cover negative pressure, after can the Preset Time when the electric weigher Seize ACK message occurs, described discharging cover negative pressure is carried out current batch data sampling, and behind the Preset Time when the electric weigher Seize ACK message disappears, stop the data sampling to described discharging cover negative pressure.
For the collection of the initial data of electric weigher flow, can when the electric weigher Seize ACK message occur, described electric weigher flow be carried out current batch data sampling, and when the electric weigher Seize ACK message disappears, stop the data sampling to described electric weigher flow.
Collection for the initial data of entrance moisture content of cut tobaccos, can be when the entrance moisture content of cut tobaccos be not less than default entrance moisture content of cut tobaccos value, or behind the Preset Time when the electric weigher Seize ACK message occurs, described entrance moisture content of cut tobaccos carried out current batch data sampling, and when the entrance moisture content of cut tobaccos is lower than default entrance moisture content of cut tobaccos value, stop the data sampling to the entrance moisture content of cut tobaccos.
Collection for the initial data of hot blast temperature, after can the Preset Time when the electric weigher Seize ACK message occurs, described hot blast temperature is carried out current batch data sampling, and behind the Preset Time when the electric weigher Seize ACK message disappears, stop the data sampling to described hot blast temperature.
In the collection of the initial data of above-mentioned technological parameter, the Preset Time that relates to, preset value all can be arranged according to actual environment by the technical staff.
After the initial data that has obtained technological parameter, can convert these initial data to working ability under the stable state of this technological parameter under this batch, the Measure of Process Capability that the established technology parameter is corresponding by calculating.
Take the outlet moisture content of cut tobaccos of drying process as example, x is made as the sampled value of this technological parameter, and n is made as hits, at first calculates corresponding average and mark partially according to this sampled value x and hits n, and formula is as follows:
The mean value computation formula:
Mark inclined to one side computing formula:
According to average and and the inclined to one side process capability C that calculates in the steady-state process of mark
pWith process accuracy K, formula is as follows:
C
pComputing formula:
The K computing formula:
Wherein, process capability C
PThe discrete case that the expression data distribute, process accuracy K represents that the data overall distribution departs from situation in the steady-state process, T represents to allow maximum and allows the poor of minimum of a value, σ
SpecRepresent 1/3 franchise.
And then according to the process capability C in the steady-state process
PCalculate Measure of Process Capability C with process accuracy K
Pk, formula is as follows:
C
PkComputing formula: Cpk=(1-K) * Cp
After obtaining the Measure of Process Capability of each technological parameter, calculate corresponding process capability evaluation value by process capability evaluation function default in the system, the slope of curve of this process capability evaluation function in each segmentation span of Measure of Process Capability is different, the slope of curve of the segmentation that wherein span is less is greater than the slope of curve of the larger segmentation of span, it is larger at the increase rate of hour adjusting its process capability evaluation value that can obtain that this mainly is based on Measure of Process Capability, and the increase rate of adjusting its process capability evaluation value that can obtain when Measure of Process Capability is larger is less, and not even significantly experience designs.
For example shown in Figure 2, Measure of Process Capability is [0,0.83] time the corresponding functional value curve a that fits to, Measure of Process Capability (0.83,1.67] time slope of a curve b that fits to of corresponding functional value and when process Capability index corresponding functional value greater than 1.67 time be the preset maximum value of process capability evaluation value, it simulates the slope that is is zero straight line.
Measure of Process Capability is [0,0.83] time, because corresponding process capability evaluation value is relatively poor, if improve, then may bring obvious effect, and Measure of Process Capability is (0.83,1.67] time, improvement effect is less obvious, so the slope of curve a will be higher than the slope of curve b, the slope here refer to interval in the slope of each point.In addition, the slope of curve a and curve b is positive number, when the expression Measure of Process Capability is interior in [0,1.67], is proportionate with the process capability evaluation value.
This process capability evaluation function can adopt first-order equation (performance is continuous a plurality of broken lines in the drawings), second-order equation or Problem of Fourth-order Differential Equations, and the technical staff can select the equation of corresponding exponent number to carry out curve fitting according to the precision needs.The process capability evaluation value that draws can be located at more easily by the data interval of identification, and for example [0,100] or [0,10] so also possesses certain intuitive.
After having obtained the process capability evaluation value of each technological parameter, calculate batch process capability evaluation value of this batch, the weighted average of the process capability evaluation value of each technological parameter namely, the setting of the weight of each technological parameter has been mentioned in the front will consider significance level.
Each batch all can calculate corresponding batch process capability evaluation value, can be used as the benchmark of the processing quality of estimating this batch, by with the processing quality situation that relatively just can get information about this batch of predetermined threshold value, for the poor quality batch, can be lower than preset level by the process capability evaluation value that the mode of recalling is found out which technological parameter in this batch, just can be optimized adjustment to this technological parameter targetedly, this just provides very valuable guidance to the technical staff, and reduced the dependence that veteran technical staff is judged, reduce the man-hour that consumes, and the actual optimizing process of adjusting still can adopt existing more common adjustment mode, just can reach the purpose of optimization, take the outlet moisture content of cut tobaccos as example, if date back to the quality existing problems of certain batch outlet moisture content of cut tobaccos, the technical staff just can improve the quality that exports moisture content of cut tobaccos according to the air quantity of existing adjustment mode such as adjusting process air-flow etc. so.
In drying process, unstable state part also can impact the process capability of reality, defective pipe tobacco time for example, namely exports the summation of time, fracture time and the overproof time of process of stub bar that moisture content of cut tobaccos produces, material tail in batch production process.During this period of time, the implementation of technological parameter is in unstable state.For the unstable state part is also listed in the defect location and process optimization of process capability, can utilize the defective pipe tobacco time course merit rating function of systemic presupposition to calculate process capability evaluation value corresponding to defective pipe tobacco time.
At first to carry out the acquisition operations of defective pipe tobacco time, this operation can be for when the electric weigher Seize ACK message occurs, the outlet moisture content of cut tobaccos is not less than default moisture content of cut tobaccos value to the time of the default index lower limit (i.e. default index-franchise) of outlet moisture content of cut tobaccos, and when the electric weigher Seize ACK message disappears, be limited to the time of described default moisture content of cut tobaccos value under the default index of record outlet moisture content of cut tobaccos, comprise that also the outlet moisture content of cut tobaccos leaves the time of the positive and negative tolerance of default index.
Obtaining defective pipe tobacco after the time, can draw corresponding process capability evaluation value by defective pipe tobacco time course merit rating function calculation, this process capability evaluation function also can simulate multistage broken line or curve by corresponding functional value at the interval of defective pipe tobacco time, for example shown in Figure 3, the defective pipe tobacco time at [A, B] time the corresponding functional value slope of a curve that fits to be negative, when the defective pipe tobacco time greater than B (for example 150s-500s), then corresponding functional value is the predetermined minimum of process capability evaluation value, when the defective pipe tobacco time less than A (for example 0-200s), then corresponding functional value is the preset maximum value of process capability evaluation value.This defective pipe tobacco time course merit rating function can adopt single order or second-order equation.
Only consider under the stable situation in front, weighted average calculation is only considered each technological parameter, and considered in the astable situation, the calculating that also will add process capability evaluation value corresponding to defective pipe tobacco time in the weighted average calculation, be about to each technological parameter and process capability evaluation value corresponding to defective pipe tobacco time and do together weighted average, obtain batch process capability evaluation value of this batch.The weight of defective pipe tobacco time is selected between the weight value of expecting cover negative pressure and electric weigher flow (allowing identical with the weight of technological parameter).
Below by several groups of experimental datas the technique effect that the present invention realizes is described, in this experiment, the interval of process capability evaluation value is [0,100], to make things convenient for the corresponding quality of intuitively identification of technical staff.
A plurality of batches of drying process (for example batches 114295,114359,114305) process capability evaluation value is respectively 81.05,84.12,88.61, predetermined threshold value is 83, then can judge wherein batches 114295 process capability evaluation value and not reach requirement, and then the corresponding process capability evaluation value of each technological parameter of transferring this batch 114295, the process capability evaluation value that the outlet moisture content of cut tobaccos of drying process is corresponding in each technological parameter is 69.77, also less than predetermined threshold value 83, at this moment process capability evaluation value corresponding to outlet moisture content of cut tobaccos that can also observe adjacent batch is 77.73, this has also proved the outlet moisture content of cut tobaccos control existing problems in the drying process, needs the technical staff to adjust targetedly optimization.The technical staff can transfer the changing trend diagram of the outlet moisture content of cut tobaccos in this problem batch, and the variation of the outlet moisture content of cut tobaccos by analyzing each period comes the problem identificatioin position, in order to make more accurate optimization.
Under the application of the inventive method, what the process capability evaluation value surpassed predetermined threshold value 83 in the baking silk production in May, 2010 batch accounts for 73.71%, has improved 5.11% than the ratio 68.6% in April; June, the process capability evaluation value accounted for 77.14% above the ratio of predetermined threshold value 83, had improved 3.43% than May; July, the process capability evaluation value accounted for 90.86% above the ratio of predetermined threshold value 83, had improved 13.72% than June.Experimental results show that, the inventive method can improve baking silk technical process ability in actual applications really, and then the qualification rate of raising product output, and for the technical staff, simple to operate, do not need to go by rule of thumb to guess defect parameters, reduced the blindness of optimizing, also reduced the dependence to veteran technical staff, enterprise has been raised the efficiency the reduction cost all can bring useful help.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of programmed instruction, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the thinking of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (13)
1. method that improves tobacco-drying process capability comprises:
Gather the initial data of the multinomial technological parameter of drying process;
Calculate respectively the Measure of Process Capability of various process parameters according to the initial data of described multinomial technological parameter;
According to default process capability evaluation function the Measure of Process Capability of various process parameters is changed, obtained the process capability evaluation value of various process parameters;
Process capability evaluation value to described various process parameters is weighted on average, obtains current batch batch process capability evaluation value;
Judge whether a described current batch batch process capability evaluation value reaches predetermined threshold value, if do not reach predetermined threshold value, whether the process capability evaluation value that then checks the various process parameters in described current batch reaches predetermined threshold value, and the technological parameter that does not reach predetermined threshold value is carried out adjusting operation.
2. method according to claim 1, wherein said multinomial technological parameter comprises: the outlet moisture content of cut tobaccos of cut-tobacco drier, barrel pressure, discharging cover negative pressure, electric weigher flow, entrance moisture content of cut tobaccos and hot blast temperature.
3. method according to claim 2, wherein add temporary in the process capability evaluation value to described various process parameters, the size of the weight of various process parameters is by the order ordering of outlet moisture content of cut tobaccos, barrel pressure, discharging cover negative pressure, electric weigher flow, entrance moisture content of cut tobaccos and hot blast temperature.
4. method according to claim 1, the slope of curve of wherein said process capability evaluation function in each segmentation span of Measure of Process Capability is different, and the slope of curve of the segmentation that wherein span is less is greater than the slope of curve of the larger segmentation of span.
5. method according to claim 4, wherein at Measure of Process Capability [0,0.83] slope of a curve that fits to of functional value corresponding to segmentation is higher than Measure of Process Capability (0.83,1.67] slope of a curve that fits to of functional value corresponding to segmentation, Measure of Process Capability is [0,1.67] slope of a curve that fits to of functional value corresponding to segmentation is positive number, when the process Capability index greater than 1.67, then corresponding functional value is the preset maximum value of process capability evaluation value.
6. the operation that method according to claim 1, wherein said initial data according to technological parameter calculate corresponding Measure of Process Capability specifically comprises:
Calculate the average of described technological parameter and mark inclined to one side according to the sampled value in the initial data of technological parameter and hits;
According to average and inclined to one side process capability and the process accuracy of calculating in the steady-state process of mark of described technological parameter, wherein said process capability represents the discrete case that data distribute, and described process accuracy represents that the data overall distribution departs from situation in the steady-state process;
Calculate Measure of Process Capability according to the process capability in the steady-state process and process accuracy.
7. method according to claim 3 wherein when batch process capability evaluation value of calculating current batch, is weighted on average process capability evaluation value and the process capability evaluation value corresponding to defective pipe tobacco time of described various process parameters.
8. method according to claim 7, wherein add temporary in the process capability evaluation value to described various process parameters and defective pipe tobacco time, the size of the weight of various process parameters is by the order ordering of outlet moisture content of cut tobaccos, barrel pressure, discharging cover negative pressure, defective pipe tobacco time, electric weigher flow, entrance moisture content of cut tobaccos and hot blast temperature.
9. according to claim 7 or 8 described methods, the wherein said defective pipe tobacco time, corresponding process capability evaluation value drew by defective pipe tobacco time course merit rating function calculation, the defective pipe tobacco time at [A, B] time the corresponding functional value slope of a curve that fits to be negative, when the defective pipe tobacco time greater than B, then corresponding functional value is the predetermined minimum of process capability evaluation value, when the defective pipe tobacco time less than A, then corresponding functional value is the preset maximum value of process capability evaluation value.
10. method according to claim 9, wherein the interval of time A is [0,200s], the interval of time B is [150s, 500s].
11. according to claim 7 or 8 described methods, the summation of time, fracture time and the overproof time of process of the stub bar that in batch production process, produces for the outlet moisture content of cut tobaccos of wherein said defective pipe tobacco time, material tail.
12. method according to claim 1, the operation of the initial data of the multinomial technological parameter of wherein said collection drying process specifically comprises:
When the electric weigher Seize ACK message occurs, and when the outlet moisture content of cut tobaccos is not less than default moisture content of cut tobaccos value, described outlet moisture content of cut tobaccos carried out current batch data sampling, and disappear at the electric weigher Seize ACK message, and after the outlet moisture content of cut tobaccos is lower than described default moisture content of cut tobaccos value, stop the data sampling to described outlet moisture content of cut tobaccos;
When the electric weigher Seize ACK message occurs, and barrel pressure be not less than preset pressure value the time, perhaps behind the Preset Time when the electric weigher Seize ACK message occurs, described barrel pressure carried out current batch data sampling, and disappear at the electric weigher Seize ACK message, and after barrel pressure is lower than described preset pressure value, stop the data sampling to described barrel pressure;
Behind the Preset Time when the electric weigher Seize ACK message occurs, described discharging cover negative pressure is carried out current batch data sampling, and behind the Preset Time when the electric weigher Seize ACK message disappears, stop the data sampling to described discharging cover negative pressure;
When the electric weigher Seize ACK message occurs, described electric weigher flow is carried out current batch data sampling, and when the electric weigher Seize ACK message disappears, stop the data sampling to described electric weigher flow;
When the entrance moisture content of cut tobaccos is not less than default entrance moisture content of cut tobaccos value, or behind the Preset Time when the electric weigher Seize ACK message occurs, described entrance moisture content of cut tobaccos carried out current batch data sampling, and when the entrance moisture content of cut tobaccos is lower than default entrance moisture content of cut tobaccos value, stop the data sampling to described entrance moisture content of cut tobaccos;
Behind the Preset Time when the electric weigher Seize ACK message occurs, described hot blast temperature is carried out current batch data sampling, and behind the Preset Time when the electric weigher Seize ACK message disappears, stop the data sampling to described hot blast temperature.
13. method according to claim 11, wherein the acquisition operations of defective pipe tobacco time is specially:
When the electric weigher Seize ACK message occurs, the outlet moisture content of cut tobaccos is not less than default moisture content of cut tobaccos value to the time of the default index lower limit of outlet moisture content of cut tobaccos, and when the electric weigher Seize ACK message disappears, be limited to the time of described default moisture content of cut tobaccos value under the default index of record outlet moisture content of cut tobaccos, also comprise the time that moisture content of cut tobaccos leaves the positive and negative tolerance of default index that exports when the electric weigher Seize ACK message takies.
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| CN103610227B (en) * | 2013-12-09 | 2015-04-15 | 中南大学 | Cut tobacco dryer head and tail section process variable optimizing control method |
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