CN103704869B - A kind of expanded cut tobacco perfuming flow control methods - Google Patents
A kind of expanded cut tobacco perfuming flow control methods Download PDFInfo
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Abstract
The present invention relates to pipe tobacco production field, relate more specifically to a kind of expanded cut tobacco perfuming flow control methods.Its PLC utilizes fuzzy control method, comprise bound to control and increment control algorithm, flow control is carried out to control object, is specially: S1. detects belt conveyer scale whether initial start, if then initial controlled quentity controlled variable is performed S2 as the current controlled quentity controlled variable of control object, otherwise perform S2; S2. the running frequency of belt conveyer scale is detected; S3. judge whether belt conveyer scale running frequency exceedes higher limit, if then the current controlled quentity controlled variable of control object is adjusted to the first controlled quentity controlled variable and performs S4, otherwise perform S4; S4. judge that whether the running frequency of belt conveyer scale is lower than lower limit, if then the current controlled quentity controlled variable of control object is adjusted to the second controlled quentity controlled variable and returns S1, otherwise return S1; Wherein, control object is belt conveyer scale or conveying belt.The present invention can make the flow trim of pipe tobacco on belt conveyer scale change, and realizes the object stablizing swollen rear tobacco perfuming flow.
Description
Technical field
The present invention relates to pipe tobacco production field, more specifically, relate to a kind of expanded cut tobacco perfuming flow control methods.
Background technology
At present, tobacco cutting process can be generally that pipe tobacco adds spices, and be called perfuming process, it is generally carry out perfuming according to certain ratio to swollen silk according to the flow of swollen silk.As shown in Figure 1, its technological process is generally: the impregnated swollen front pipe tobacco of liquid CO 2 after vibration bin V31 is loose by conveying belt M32 deliver to expansion joint through hot blast be expanded into swollen after pipe tobacco, belt conveyer scale M51 measures the flow of swollen rear pipe tobacco and signal is delivered to PLC, and PLC controls perfuming pump according to setting ratio and carries out perfuming to swollen rear pipe tobacco.According to the technological requirement of producing, when carrying out perfuming to swollen silk, the flow of its perfuming needs to accomplish to stablize and evenly, ensure that perfuming flow rate fluctuation is within the scope of ± 1 l/h.And in actual applications, the fluctuation range of swollen silk perfuming flow is but at 12 ~ 16 ls/h, flow rate fluctuation is at ± 2 ls/h, and flow instantaneous fluctuation is frequent, very unstable, specifically one group of experimental data as shown in Figure 2: from the data record of Fig. 2, perfuming flow rate fluctuation minimum value is ± 1.6 ls/h, be to the maximum ± 2.2 ls/h, all exceed ± the technological requirement of 1.0 ls/h.Therefore, existing process cannot meet the technological requirement of production, the control weight of swollen silk perfuming cannot be guaranteed, thus greatly have influence on the crudy of pipe tobacco.
Summary of the invention
The present invention, for overcoming at least one defect described in above-mentioned prior art, provides a kind of expanded cut tobacco perfuming flow control methods can stablizing swollen rear tobacco perfuming flow.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of expanded cut tobacco perfuming flow control methods, PLC utilizes bound control algolithm to carry out flow control to control object, and concrete steps are:
Step S1. detects whether belt conveyer scale is initial start, if then using the current controlled quentity controlled variable of initial controlled quentity controlled variable as control object, then performs step S2, otherwise directly performs step S2;
Step S2. detects the running frequency of belt conveyer scale;
Step S3. judges whether the running frequency of belt conveyer scale exceedes higher limit, if then the current controlled quentity controlled variable of control object is adjusted to the first controlled quentity controlled variable, and performs step S4, otherwise directly performs step S4;
Step S4. judges that whether the running frequency of belt conveyer scale is lower than lower limit, if then the current controlled quentity controlled variable of control object is adjusted to the second controlled quentity controlled variable, then returns step S1, otherwise returns step S1;
Wherein, described control object is belt conveyer scale or conveying belt.
One of improve: when control object is belt conveyer scale, the current controlled quentity controlled variable of its correspondence is the average flow rate value of the supplied materials per hour on belt conveyer scale, the value that first controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being reduced the first variable quantity, the value that the second controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being increased the first variable quantity.
Two of improvement: described first variable quantity is set to 2% of current controlled quentity controlled variable.
Three of improvement: when control object is conveying belt, the current controlled quentity controlled variable of its correspondence is the ongoing frequency value of conveying belt, the frequency values that first controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being increased the second variable quantity, the frequency values that the second controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being reduced the second variable quantity.
Four of improvement: described second variable quantity is set to 2% of current controlled quentity controlled variable.
Five of improvement: described method also comprises PLC and utilizes increment correction algorithm to carry out flow control to control object, and concrete steps are:
Step S5. detects according to the running frequency of sampling time to belt conveyer scale preset, and then performs step S6;
The belt conveyer scale running frequency that this samples by step S6. compares with the last belt conveyer scale running frequency obtained of sampling, if belt conveyer scale running frequency rises, then the current controlled quentity controlled variable of control object is adjusted to the 3rd controlled quentity controlled variable, if belt conveyer scale running frequency declines, then the current controlled quentity controlled variable of control object is adjusted to the 4th controlled quentity controlled variable.
Six of improvement: the described default sampling time is 10 seconds.
Seven of improvement: when control object is belt conveyer scale, the 3rd controlled quentity controlled variable of its correspondence reduces the value that the 3rd variable quantity obtains for current controlled quentity controlled variable, and the 4th controlled quentity controlled variable of its correspondence increases the value that the 3rd variable quantity obtains for current controlled quentity controlled variable.
Eight of improvement: described 3rd variable quantity is set to 0.5% of current controlled quentity controlled variable.
Nine of improvement: when control object is conveying belt, the 3rd controlled quentity controlled variable of its correspondence increases the value that the 4th variable quantity obtains for current controlled quentity controlled variable, and the 4th controlled quentity controlled variable of its correspondence reduces the value that the 4th variable quantity obtains for current controlled quentity controlled variable.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
(1) the present invention utilizes the feedback of belt conveyer scale running frequency, by bound control algolithm, flow control is carried out to the belt conveyer scale in swollen silk perfuming process process or conveying belt, the flow trim of pipe tobacco on belt conveyer scale is changed, realizes the object stablizing swollen rear tobacco perfuming flow.
(2) the present invention carries out further flow control by increment correction algorithm to belt conveyer scale or conveying belt on the basis of bound algorithm, make the fluctuation of perfuming flow mild, when wherein flow control being carried out to belt conveyer scale, the fluctuation range of perfuming flow reaches ± technological requirement of 1 liter/h, when flow control is carried out to conveying belt, the fluctuation range of perfuming flow controls in ± 0.2 liter/h, and exceed ± the technological requirement of 1 liter/h, effect is more obvious.
Accompanying drawing explanation
Fig. 1 is tobacco flavoring process system block diagram in prior art.
Fig. 2 is the Experiment Data Records figure of swollen silk perfuming flow in prior art.
Fig. 3 is the schematic diagram problem of perfuming instability of flow being carried out to the analysis of causes.
Fig. 4 is perfuming instability of flow end reason investigation schematic diagram.
Fig. 5 is the process flow diagram of bound control algolithm in a kind of expanded cut tobacco perfuming flow control methods embodiment 1 of the present invention.
Fig. 6 is the process flow diagram of increment correction algorithm in a kind of expanded cut tobacco perfuming flow control methods embodiment 1 of the present invention.
Fig. 7 is supplied materials perfuming traffic trends figure on belt conveyer scale in prior art.
Fig. 8 is the perfuming traffic trends figure after the system shown in Figure 1 application embodiment of the present invention 1 on belt conveyer scale.
Fig. 9 is the process flow diagram of bound control algolithm in a kind of expanded cut tobacco perfuming flow control methods embodiment 2 of the present invention.
Figure 10 is the process flow diagram of increment correction algorithm in a kind of expanded cut tobacco perfuming flow control methods embodiment 1 of the present invention.
Figure 11 is the perfuming traffic trends figure after the system shown in Figure 1 application embodiment of the present invention 2 on belt conveyer scale.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
In order to stablize swollen rear tobacco perfuming flow, reduce flow rate fluctuation, target setting controls at ± 1 l/h for controlling flow rate fluctuation from ± 2 ls/h, to meet technological requirement, improves the Mass Control of swollen silk perfuming.In order to realize above-mentioned target, braistorming is adopted to carry out the analysis of causes to the problem of perfuming instability of flow, specifically as shown in Figure 3.The end reason that be have found perfuming instability of flow by the causal analysis diagram of Fig. 3 has 10, and the arrange distinguish method confirmed by essential factor carries out check analysis to each end reason, specifically as shown in Figure 4.Essential factor according to Fig. 4 confirms, find that the main cause of perfuming flow rate fluctuation is that the M51 belt conveyer scale shown in Fig. 1 does not carry out flow control, reason is: in the system shown in figure 1, the swollen rear pipe tobacco flowed out by expansion joint certainly exists the fluctuation of flow, the fluctuation of flow delivers to PLC faithfully by after the measurement of M51 belt scale metering scale, PLC controls perfuming flow in perfuming ratio, thus causes the fluctuation of perfuming flow.Therefore, confirm according to essential factor, can determine that the main cause of perfuming instability of flow is that belt conveyer scale does not carry out flow control.Propose following control method according to this essential factor to control belt conveyer scale flow.In the present invention, PLC can reach control objectives by the flow directly controlling belt conveyer scale, also can by the speed of conveying belt, and make it and belt conveyer scale flow matches, thus reach control objectives, concrete grammar is illustrated by following specific embodiment.
Embodiment 1
As shown in Figure 5, be the process flow diagram of this specific embodiment, in the present embodiment, PLC with belt conveyer scale M51 for control object.See Fig. 5, in a kind of expanded cut tobacco perfuming flow control methods of this specific embodiment, PLC utilizes bound control algolithm to carry out flow control to the belt conveyer scale as control object, and concrete steps are:
Step S101. detects whether belt conveyer scale M51 is initial start, if then using the current controlled quentity controlled variable of initial controlled quentity controlled variable as belt conveyer scale M51, then performs step S102, otherwise directly performs step S102; Wherein the initial controlled quentity controlled variable at this place is that correspondence is arranged with this control object of belt conveyer scale M51, can set according to priori;
Step S102. detects the running frequency of belt conveyer scale M51;
Step S103. judges whether the running frequency of belt conveyer scale M51 exceedes higher limit, if then the current controlled quentity controlled variable of belt conveyer scale M51 as control object is adjusted to the first controlled quentity controlled variable, and performs step S104, otherwise directly performs step S104;
Step S104. judges that whether the running frequency of belt conveyer scale M51 is lower than lower limit, if then the current controlled quentity controlled variable of belt conveyer scale M51 as control object is adjusted to the second controlled quentity controlled variable, then returns step S101, otherwise returns step S101.
In specific implementation process, for the ease of PLC, frequency detecting and flow set are carried out to belt conveyer scale M51, two 2 core shielded cables can be laid between PLC and belt conveyer scale M51 electricity cabinet.
In specific implementation process, in step S103 and S104, according to control object belt conveyer scale M51, preset upper limit frequency value and the lower limit frequency value of belt conveyer scale M51 running frequency, when flow control is carried out to belt conveyer scale M51, adjust the current controlled quentity controlled variable of belt conveyer scale M51 according to real-time running frequency value and upper limit frequency value, lower limit frequency value.Wherein, upper limit frequency value, lower limit frequency value can carry out arranging and adjusting according to practical experience.
In specific implementation process, as control object belt conveyer scale corresponding to current controlled quentity controlled variable be the average flow rate value of the supplied materials per hour on belt conveyer scale, first controlled quentity controlled variable of its correspondence can be set to the value current controlled quentity controlled variable being reduced the first variable quantity and obtain, and the second controlled quentity controlled variable of its correspondence can be set to the value current controlled quentity controlled variable being increased the first variable quantity and obtain.In a most preferred embodiment, the first variable quantity is set to 2% of current controlled quentity controlled variable.
In this specific embodiment, its control thought is the setting flow tracking to belt conveyer scale, when supplied materials flow increases, belt conveyer scale M51 running frequency constantly declines, to maintain setting flow, when belt conveyer scale M51 running frequency drops to a threshold value, think that the setting flow of belt conveyer scale M51 is too low, so improve setting flow, in like manner, when belt conveyer scale M51 running frequency constantly rises to a threshold value, think that setting flow is too high, so reduce the setting flow of belt conveyer scale M51, thus reach the control to belt conveyer scale M51 flow.
To make after the PLC of this specific embodiment utilizes bound control algolithm to carry out flow control to the belt conveyer scale as control object on belt conveyer scale flow of tobacco relative to before transformation steadily.As shown in Figure 6, in order to improve control effects further, the basis of bound control algolithm also carries out flow control by increment correction algorithm to belt conveyer scale M51, and concrete steps are as follows:
Step S105. detects according to the running frequency of sampling time to belt conveyer scale M51 preset, and then performs step S106;
The belt conveyer scale M51 running frequency that this samples by step S106. compares with the last belt conveyer scale M51 running frequency obtained of sampling, if belt conveyer scale M51 running frequency rises, then the current controlled quentity controlled variable of the belt conveyer scale as control object is adjusted to the 3rd controlled quentity controlled variable, if belt conveyer scale M51 running frequency declines, then the current controlled quentity controlled variable of the belt conveyer scale as control object is adjusted to the 4th controlled quentity controlled variable.
In step S105, the sampling time of presetting can set according to priori, and generally can be set as 10 seconds, also can be other values.
In step s 106, the 3rd controlled quentity controlled variable that the belt conveyer scale as control object is corresponding can be set to current controlled quentity controlled variable and reduce the value that obtains of the 3rd variable quantity, and the 4th controlled quentity controlled variable of its correspondence can be set to current controlled quentity controlled variable increases the value that the 3rd variable quantity obtains.Preferably, the 3rd variable quantity is set to 0.5% of current controlled quentity controlled variable.
After this specific embodiment carries out flow control in conjunction with increment correction algorithm to belt conveyer scale M51 on the basis of bound control algolithm, perfuming flow improves significantly, and fluctuation becomes steady, controls flow rate fluctuation in ± 1 l/h, can reach technological requirement.
System shown in Fig. 1 utilize this specific embodiment to carry out experimental verification, be 600kg/h by M51 belt conveyer scale flow set, when M51 belt conveyer scale real time execution frequency exceedes upper limit frequency value, current for M51 belt conveyer scale controlled quentity controlled variable is reduced 10kg/h, when M51 belt conveyer scale real time execution frequency is lower than lower limit frequency value, current for M51 belt conveyer scale controlled quentity controlled variable is increased 10kg/h; Simultaneously, the running frequency of M51 belt conveyer scale was detected in every 10 seconds, when this running frequency sampled of M51 belt conveyer scale rises relative to the running frequency that the last time samples, then current for M51 belt conveyer scale controlled quentity controlled variable is reduced 2kg/h, if decline, current for M51 belt conveyer scale controlled quentity controlled variable is increased 2kg/h.In experimentation, M51 belt conveyer scale perfuming traffic trends figure as indicated with 7 and 8, wherein Fig. 7 is perfuming flow schematic diagram before transformation, as can be seen from the perfuming flow curve of Fig. 7 elliptic region, swollen silk perfuming flow fluctuates within the scope of 12 ~ 16 ls/h, flow rate fluctuation reaches ± and 2 ls/h, and flow instantaneous fluctuation is frequent, very unstable; Figure 8 shows that this specific embodiment utilizes bound control algolithm and increment correction algorithm to carry out the perfuming flow schematic diagram after flow control to belt conveyer scale, as can be seen from the perfuming flow curve of Fig. 8 elliptic region, perfuming flow rate fluctuation is greatly mild, perfuming flow changes within the scope of 13 ~ 15 ls/h, reaches ± 1 l/h of technological requirement.
Embodiment 2
In the present invention, PLC can also using the M32 conveying belt shown in Fig. 1 as control object, and the supplied materials flow of setting M51 belt conveyer scale is a steady state value, and the speed of control M32 conveying belt, makes it and M51 belt conveyer scale flow matches, can reach the object of constant current perfuming.
As shown in Figure 9, be the process flow diagram of this specific embodiment, in the present embodiment, PLC take conveying belt as control object.See Fig. 9, in a kind of expanded cut tobacco perfuming flow control methods of this specific embodiment, PLC utilizes bound control algolithm to carry out flow control to the conveying belt M32 as control object, and concrete steps are:
Step S201. detects whether belt conveyer scale M51 is initial start, if then using the current controlled quentity controlled variable of initial controlled quentity controlled variable as conveying belt M32, then performs step S202, otherwise directly performs step S202; Wherein the initial controlled quentity controlled variable at this place is arranged corresponding to conveying belt M32, can set according to priori;
Step S202. detects the running frequency of belt conveyer scale M51;
Step S203. judges whether the running frequency of belt conveyer scale M51 exceedes higher limit, if then the current controlled quentity controlled variable of conveying belt M32 as control object is adjusted to the first controlled quentity controlled variable, and performs step S204, otherwise directly performs step S204;
Step S204. judges that whether the running frequency of belt conveyer scale M51 is lower than lower limit, if then the current controlled quentity controlled variable of conveying belt M32 as control object is adjusted to the second controlled quentity controlled variable, then returns step S201, otherwise returns step S201.
In specific implementation process, in step S203 and S204, according to control object conveying belt M32, preset upper limit frequency value and the lower limit frequency value of belt conveyer scale M51 running frequency, when flow control is carried out to conveying belt M32, according to real-time running frequency value and upper limit frequency value, lower limit frequency value adjusts the current controlled quentity controlled variable of skin conveying belt, wherein, when control object is conveying belt M32, the higher limit of the belt conveyer scale M51 running frequency of its correspondence is the frequency values exceeding capping frequency values 45Hz, the lower limit of the belt conveyer scale M51 running frequency of its correspondence is the frequency values lower than setting lower limit frequency value 45Hz.When belt conveyer scale M51 real time execution frequency exceedes upper limit frequency value 45Hz, just current for conveying belt M32 controlled quentity controlled variable is adjusted to the first controlled quentity controlled variable, when belt conveyer scale M51 real time execution frequency is lower than lower limit frequency value 45Hz, just the current controlled quentity controlled variable of conveying belt M32 is adjusted to the second controlled quentity controlled variable.
In specific implementation process, as control object conveying belt M32 corresponding to current controlled quentity controlled variable be the ongoing frequency value of conveying belt, the frequency values that first controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being increased the second variable quantity, the frequency values that the second controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being reduced the second variable quantity.In a most preferred embodiment, the second variable quantity is set to 2% of current controlled quentity controlled variable.
To make after the PLC of this specific embodiment utilizes bound control algolithm to carry out flow control to the conveying belt M32 as control object on belt conveyer scale M51 flow of tobacco relative to before transformation steadily.As shown in Figure 10, in order to improve control effects further, the basis of bound control algolithm also carries out flow control by increment correction algorithm to conveying belt M32, and concrete steps are as follows:
Step S205. detects according to the running frequency of sampling time to belt conveyer scale M51 preset, and then performs step S206;
The belt conveyer scale M51 running frequency that this samples by step S206. compares with the last belt conveyer scale M51 running frequency obtained of sampling, if belt conveyer scale M51 running frequency rises, then the current controlled quentity controlled variable of the conveying belt M32 as control object is adjusted to the 3rd controlled quentity controlled variable, if belt conveyer scale M51 running frequency declines, then the current controlled quentity controlled variable of the conveying belt M32 as control object is adjusted to the 4th controlled quentity controlled variable.
In step S205, the sampling time of presetting can set according to priori, and generally can be set as 10 seconds, also can be other values.
In step S206, the 3rd controlled quentity controlled variable that the conveying belt as control object is corresponding can be set to current controlled quentity controlled variable increases the value that obtains of the 4th variable quantity, and the 4th controlled quentity controlled variable of its correspondence can be set to current controlled quentity controlled variable and reduce the value that the 4th variable quantity obtains.
This specific embodiment carries out flow control in conjunction with increment correction algorithm on the basis of bound control algolithm, belt conveyer scale M51 flow set is steady state value by it, utilize the frequency feedback of belt conveyer scale M51 to control conveying belt M32 speed, finally reach the object of constant current perfuming.
System shown in Fig. 1 utilize this specific embodiment to carry out experimental verification, be 660kg/h by M51 belt conveyer scale flow set, the initial controlled quentity controlled variable of M32 conveying belt is set to 30Hz, when M51 belt conveyer scale real time execution frequency exceedes upper limit frequency value 45Hz, current for M32 conveying belt controlled quentity controlled variable is increased 2Hz, when M51 belt conveyer scale real time execution frequency is lower than lower limit frequency value 45Hz, current for M32 conveying belt controlled quentity controlled variable is reduced 2Hz; Simultaneously, the running frequency of M51 belt conveyer scale was detected in every 10 seconds, when this running frequency sampled of M51 belt conveyer scale rises relative to the running frequency that the last time samples, then current for M32 conveying belt controlled quentity controlled variable is increased 1Hz, if decline, current for M32 conveying belt controlled quentity controlled variable is reduced 1Hz.In experimentation, M51 belt conveyer scale perfuming data are as shown in table 1 below:
Table 1
| Sequence number | Date | Batch | Maximum flow (l/h) | Minimum flow (l/h) | Flow rate fluctuation (l/h) |
| 1 | First day | 91-3757 | 13．4 | 13．1 | ±0.15 |
| 2 | First day | 93-6783 | 13．4 | 13．0 | ±0.20 |
| 3 | Second day | 91-3758 | 13．3 | 13．0 | ±0.15 |
| 4 | Second day | 91-3759 | 13．3 | 13．1 | ±0.10 |
| 5 | 3rd day | 91-3761 | 13．2 | 13．0 | ±0.10 |
| 6 | 3rd day | 93-6786 | 13．3 | 13．0 | ±0.15 |
| 7 | 4th day | 91-3762 | 13．4 | 13．0 | ±0.20 |
| 8 | 4th day | 93-6787 | 13．3 | 13．1 | ±0.10 |
| 9 | 5th day | 93-6788 | 13．3 | 13．1 | ±0.10 |
| 10 | 5th day | 91-3764 | 13．4 | 13．1 | ±0.15 |
As shown in figure 11, for system shown in Figure 1 applies M51 belt conveyer scale perfuming traffic trends curve map after this specific embodiment, the curve map of elliptic region is M51 belt conveyer scale perfuming traffic trends, visible flow does not fluctuate, being become after transformation from the original curve 12-16 l/h of scope frequent fluctuation fluctuates at the smooth linear of ± 0.2 l/h of scope, contrast Fig. 7 transforms front perfuming traffic trends curve, perfuming effect improves fairly obvious, exceed and set to reach the ± target of 1 l/h of technological requirement, simultaneously because flow of tobacco is stablized, also improve the effect of pipe tobacco moisture regain, after moisture regain, moisture content also improves the quality of swollen silk than stable (boxed area curve as shown in Figure 11) before transformation.
In above-mentioned all schemes, the first variable quantity, the second variable quantity, the 3rd variable quantity and the 4th variable quantity all can carry out arranging and adjusting according to practical experience.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.
Claims (9)
1. an expanded cut tobacco perfuming flow control methods, is characterized in that, PLC utilizes bound control algolithm to carry out flow control to control object, and concrete steps are:
Step S1. detects whether belt conveyer scale is initial start, if then using the current controlled quentity controlled variable of initial controlled quentity controlled variable as control object, then performs step S2, otherwise directly performs step S2;
Step S2. detects the running frequency of belt conveyer scale;
Step S3. judges whether the running frequency of belt conveyer scale exceedes higher limit, if then the current controlled quentity controlled variable of control object is adjusted to the first controlled quentity controlled variable, and performs step S4, otherwise directly performs step S4;
Step S4. judges that whether the running frequency of belt conveyer scale is lower than lower limit, if then the current controlled quentity controlled variable of control object is adjusted to the second controlled quentity controlled variable, then returns step S1, otherwise returns step S1;
Wherein, described control object is belt conveyer scale or conveying belt;
Described method also comprises PLC and utilizes increment correction algorithm to carry out flow control to control object, and concrete steps are:
Step S5. detects according to the running frequency of sampling time to belt conveyer scale preset, and then performs step S6;
The belt conveyer scale running frequency that this samples by step S6. compares with the last belt conveyer scale running frequency obtained of sampling, if belt conveyer scale running frequency rises, then the current controlled quentity controlled variable of control object is adjusted to the 3rd controlled quentity controlled variable, if belt conveyer scale running frequency declines, then the current controlled quentity controlled variable of control object is adjusted to the 4th controlled quentity controlled variable.
2. expanded cut tobacco perfuming flow control methods according to claim 1, it is characterized in that, when control object is belt conveyer scale, the current controlled quentity controlled variable of its correspondence is the average flow rate value of the supplied materials per hour on belt conveyer scale, the value that first controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being reduced the first variable quantity, the value that the second controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being increased the first variable quantity.
3. expanded cut tobacco perfuming flow control methods according to claim 2, is characterized in that, described first variable quantity is set to 2% of current controlled quentity controlled variable.
4. expanded cut tobacco perfuming flow control methods according to claim 1, it is characterized in that, when control object is conveying belt, the current controlled quentity controlled variable of its correspondence is the ongoing frequency value of conveying belt, the frequency values that first controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being increased the second variable quantity, the frequency values that the second controlled quentity controlled variable of its correspondence obtains for current controlled quentity controlled variable being reduced the second variable quantity.
5. expanded cut tobacco perfuming flow control methods according to claim 4, is characterized in that, described second variable quantity is set to 2% of current controlled quentity controlled variable.
6. expanded cut tobacco perfuming flow control methods according to claim 1, is characterized in that, the described default sampling time is 10 seconds.
7. expanded cut tobacco perfuming flow control methods according to claim 1, it is characterized in that, when control object is belt conveyer scale, 3rd controlled quentity controlled variable of its correspondence reduces the value that the 3rd variable quantity obtains for current controlled quentity controlled variable, and the 4th controlled quentity controlled variable of its correspondence increases the value that the 3rd variable quantity obtains for current controlled quentity controlled variable.
8. expanded cut tobacco perfuming flow control methods according to claim 7, is characterized in that, described 3rd variable quantity is set to 0.5% of current controlled quentity controlled variable.
9. expanded cut tobacco perfuming flow control methods according to claim 1, it is characterized in that, when control object is conveying belt, 3rd controlled quentity controlled variable of its correspondence increases the value that the 4th variable quantity obtains for current controlled quentity controlled variable, and the 4th controlled quentity controlled variable of its correspondence reduces the value that the 4th variable quantity obtains for current controlled quentity controlled variable.
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| CN111580481B (en) * | 2020-05-21 | 2021-08-31 | 四川中烟工业有限责任公司 | Method for improving accumulated precision of cut stem blending |
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| CN102095484B (en) * | 2010-11-29 | 2012-05-30 | 龙岩烟草工业有限责任公司 | Weighing error monitoring method of electronic scale |
| CN102578693B (en) * | 2012-02-16 | 2014-01-08 | 河南中烟工业有限责任公司 | Method for controlling tobacco flavoring/feeding proportion precision |
| CN102626255B (en) * | 2012-04-19 | 2014-01-15 | 四川烟草工业有限责任公司成都分厂 | Control method for synthesizing tobacco primary processing flavoring accuracy calculated value |
| CN102754905B (en) * | 2012-07-30 | 2014-12-17 | 昆明船舶设备集团有限公司 | Control method for improving feeding/perfuming uniformity |
| CN202907779U (en) * | 2012-10-25 | 2013-05-01 | 贵州中烟工业有限责任公司 | Automatic-perfuming control system of Hauni cut-tobacco manufacturing machine |
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2013
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