CN103704869A - Flow control method for expanded cut tobacco perfuming - Google Patents
Flow control method for expanded cut tobacco perfuming Download PDFInfo
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- CN103704869A CN103704869A CN201310742145.4A CN201310742145A CN103704869A CN 103704869 A CN103704869 A CN 103704869A CN 201310742145 A CN201310742145 A CN 201310742145A CN 103704869 A CN103704869 A CN 103704869A
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Abstract
The invention relates to the field of cut tobacco production, in particular to a flow control method for expanded cut tobacco perfuming. A PLC performs flow control on a controlled object by using a fuzzy control method including upper-lower limit control and incremental control. The flow control method concretely includes the steps that S1, whether a belt scale is started initially or not is detected, if yes, an initial controlling quantity is taken as a current controlling quantity of the controlled object, the S2 is executed, and otherwise the S2 is executed; S2, operation frequency of the belt scale is detected; S3, whether the operation frequency of the belt scale is larger than an upper limit value or not is judged, if yes, the current controlling quantity of the controlled object is adjusted to be a first control quantity, the S4 is executed, and otherwise the S4 is executed; S4, whether the operation frequency of the belt scale is smaller than a lower limit value or not is judged, if yes, the current controlling quantity of the controlled object is adjusted to be a second control quantity, the S1 is executed again, and otherwise the S1 is executed again; the controlled object is the belt scale or a conveying belt. Due to the flow control method, the flow of cut tobaccos on the belt scale is made to change stably, and the perfuming flow of the expanded cut tobaccos is stabilized.
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 generally can be called perfuming process for pipe tobacco adds spices, and it is generally that flow according to swollen silk carries out perfuming according to certain ratio to 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 conveyer belt M32 deliver to expansion joint through hot blast expand become 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 preset proportion swollen rear pipe tobacco is carried out to perfuming.According to the technological requirement of producing, when swollen silk is carried out to perfuming, the flow of its perfuming need to be accomplished stable and even, guarantees that perfuming flowed 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, flowed fluctuation is at ± 2 ls/h, and flow instantaneous fluctuation is frequent, very unstable, concrete one group of experimental data as shown in Figure 2: from the data record of Fig. 2, perfuming flowed fluctuation minimum of a value is ± 1.6 ls/h, be to the maximum ± 2.2 ls/h, all exceed ± technological requirement of 1.0 ls/h.Therefore, existing process cannot meet the technological requirement of production, and the control weight of swollen silk perfuming cannot be guaranteed, thereby greatly has influence on the crudy of pipe tobacco.
Summary of the invention
The present invention is at least one defect overcoming described in above-mentioned prior art, and a kind of expanded cut tobacco perfuming flow control methods that can stablize swollen rear tobacco perfuming flow is provided.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
An 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 the current controlled quentity controlled variable using initial controlled quentity controlled variable as control object performs step S2, otherwise directly performs step S2;
Step S2. detects the running frequency of belt conveyer scale;
Step S3. judges that whether the running frequency of belt conveyer scale surpasses higher limit, if the current controlled quentity controlled variable of control object is adjusted into the first controlled quentity controlled variable, and performs step S4, otherwise directly performs step S4;
Step S4. judges that the running frequency of belt conveyer scale, whether lower than lower limit, if the current controlled quentity controlled variable of control object is adjusted into the second controlled quentity controlled variable, then returns to step S1, otherwise returns to step S1;
Wherein, described control object is belt conveyer scale or conveyer belt.
One of improve: when control object is belt conveyer scale, the current controlled quentity controlled variable of its correspondence is the average flow value of the supplied materials per hour on belt conveyer scale, the first controlled quentity controlled variable of its correspondence is for to reduce the resulting value of the first variable quantity by current controlled quentity controlled variable, and the second controlled quentity controlled variable of its correspondence is for to increase the resulting value of the first variable quantity by current controlled quentity controlled variable.
Two of improvement: described the first variable quantity is made as 2% of current controlled quentity controlled variable.
Three of improvement: when control object is conveyer belt, the current frequency values that the current controlled quentity controlled variable of its correspondence is conveyer belt, the first controlled quentity controlled variable of its correspondence is for to increase the resulting frequency values of the second variable quantity by current controlled quentity controlled variable, and the second controlled quentity controlled variable of its correspondence is for to reduce the resulting frequency values of the second variable quantity by current controlled quentity controlled variable.
Four of improvement: described the second variable quantity is made as 2% of current controlled quentity controlled variable.
Five of improvement: described method also comprises that PLC utilizes increment correction algorithm to carry out flow-control to control object, and concrete steps are:
Step S5. detected the running frequency of belt conveyer scale according to the default sampling time, then performed step S6;
The belt conveyer scale running frequency that step S6. samples this compares with the belt conveyer scale running frequency that last sampling obtains, if belt conveyer scale running frequency rises, the current controlled quentity controlled variable of control object is adjusted into the 3rd controlled quentity controlled variable, if belt conveyer scale running frequency declines, the current controlled quentity controlled variable of control object is adjusted into 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 is that current controlled quentity controlled variable reduces the resulting value of the 3rd variable quantity, and the 4th controlled quentity controlled variable of its correspondence is that current controlled quentity controlled variable increases the resulting value of the 3rd variable quantity.
Eight of improvement: described the 3rd variable quantity is made as 0.5% of current controlled quentity controlled variable.
Nine of improvement: when control object is conveyer belt, the 3rd controlled quentity controlled variable of its correspondence is that current controlled quentity controlled variable increases the resulting value of the 4th variable quantity, and the 4th controlled quentity controlled variable of its correspondence is that current controlled quentity controlled variable reduces the resulting value of the 4th variable quantity.
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, belt conveyer scale or conveyer belt in swollen silk perfuming process process are carried out to flow-control, make the flow smooth change of pipe tobacco on belt conveyer scale, realize the object of stablizing swollen rear tobacco perfuming flow.
(2) the present invention carries out further flow-control by increment correction algorithm to belt conveyer scale or conveyer belt on the basis of bound algorithm, make the fluctuation of perfuming flow mild, while wherein belt conveyer scale being carried out to flow-control, the technological requirement of reach ± 1 liter/h of the fluctuation range of perfuming flow, when conveyer belt is carried out to flow-control, in be controlled at ± 0.2 liter/h of the fluctuation range of perfuming flow, the technological requirement of exceed ± 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.
The schematic diagram of Fig. 3 for the problem of perfuming instability of flow is carried out to the analysis of causes.
Fig. 4 is perfuming instability of flow end reason investigation schematic diagram.
Fig. 5 is the flow chart 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 flow chart 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 on the system shown in Figure 1 application embodiment of the present invention 1 rear belt conveyer scale.
Fig. 9 is the flow chart 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 flow chart 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 on the system shown in Figure 1 application embodiment of the present invention 2 rear belt conveyer scales.
The specific embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
For better explanation the present embodiment, 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 configurations and explanation thereof may to omit be understandable.
In order to stablize swollen rear tobacco perfuming flow, reduce flowed fluctuation, target setting for control flowed fluctuation from ± 2 ls/h be controlled at ± 1 l/h, to meet technological requirement, improve the control quality of swollen silk perfuming.In order to realize above-mentioned target, adopt brainstorming to carry out the analysis of causes to the problem of perfuming instability of flow, specifically as shown in Figure 3.The end reason of having found out perfuming instability of flow by the causal analysis diagram of Fig. 3 has 10, and the arrange distinguish method of confirming by essential factor carries out check analysis to each end reason, specifically as shown in Figure 4.According to the essential factor of Fig. 4, confirm, the main cause of finding perfuming flowed 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 Fig. 1, the swollen rear pipe tobacco being flowed out by expansion joint certainly exists the fluctuation of flow, the fluctuation of flow is delivered to PLC after being measured by M51 belt scale metering scale faithfully, PLC presses perfuming proportion control perfuming flow, thereby causes the fluctuation of perfuming flow.Therefore, according to essential factor, confirm, can determine that the main cause of perfuming instability of flow is that belt conveyer scale does not carry out flow-control.According to this essential factor, having proposed following control method controls belt conveyer scale flow.In the present invention, PLC can reach by the flow of direct control belt conveyer scale control target, also can make it and belt conveyer scale flow matches by the speed of conveyer belt, thereby reaches control target, and concrete grammar illustrates by following specific embodiment.
As shown in Figure 5, be the flow chart of this specific embodiment, in the present embodiment, PLC be take belt conveyer scale M51 as control object.Referring to 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 the current controlled quentity controlled variable using initial controlled quentity controlled variable as belt conveyer scale M51 performs step S102, otherwise directly perform step S102; Wherein the initial controlled quentity controlled variable at this place is corresponding and this control object setting of belt conveyer scale M51, can set according to priori;
Step S102. detects the running frequency of belt conveyer scale M51;
Step S103. judges that whether the running frequency of belt conveyer scale M51 surpasses higher limit, if the current controlled quentity controlled variable of belt conveyer scale M51 as control object is adjusted into 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 the current controlled quentity controlled variable of belt conveyer scale M51 as control object is adjusted into the second controlled quentity controlled variable, then returns to step S101, otherwise returns to step S101.
In specific implementation process, for the ease of PLC, belt conveyer scale M51 is carried out to frequency detecting and flow set, between PLC and belt conveyer scale M51 electricity cabinet, can lay two 2 core shielded cables.
In specific implementation process, in step S103 and S104, according to control object belt conveyer scale M51, preset upper limiting frequency value and the lower frequency limit value of belt conveyer scale M51 running frequency, when belt conveyer scale M51 is carried out to flow-control, according to real-time running frequency value and upper limiting frequency value, lower frequency limit value, adjust the current controlled quentity controlled variable of belt conveyer scale M51.Wherein, upper limiting frequency value, lower frequency limit value can arrange and adjust according to practical experience.
In specific implementation process, the corresponding current controlled quentity controlled variable of belt conveyer scale as control object is the average flow value of the supplied materials per hour on belt conveyer scale, the first controlled quentity controlled variable of its correspondence can be made as current controlled quentity controlled variable is reduced to the resulting value of the first variable quantity, and the second controlled quentity controlled variable of its correspondence can be made as increases the resulting value of the first variable quantity by current controlled quentity controlled variable.In a most preferred embodiment, the first variable quantity is made as 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, set 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, thereby reach the control to belt conveyer scale M51 flow.
The PLC of this specific embodiment before utilizing bound control algolithm to carry out making after flow-control on belt conveyer scale flow of tobacco with respect to transformation to the belt conveyer scale as control object steadily.As shown in Figure 6, in order further to improve and to control effect, on the basis of bound control algolithm, also by increment correction algorithm, belt conveyer scale M51 is carried out to flow-control, concrete steps are as follows:
Step S105. detected the running frequency of belt conveyer scale M51 according to the default sampling time, then performed step S106;
The belt conveyer scale M51 running frequency that step S106. samples this compares with the belt conveyer scale M51 running frequency that last sampling obtains, if belt conveyer scale M51 running frequency rises, the current controlled quentity controlled variable of the belt conveyer scale as control object is adjusted into the 3rd controlled quentity controlled variable, if belt conveyer scale M51 running frequency declines, the current controlled quentity controlled variable of the belt conveyer scale as control object is adjusted into the 4th controlled quentity controlled variable.
In step S105, the default sampling time can be set according to priori, generally can be set as 10 seconds, also can be worth for other.
In step S106, as the 3rd controlled quentity controlled variable corresponding to the belt conveyer scale of control object, can be made as current controlled quentity controlled variable and reduce the resulting value of the 3rd variable quantity, the 4th controlled quentity controlled variable of its correspondence can be made as current controlled quentity controlled variable increases the resulting value of the 3rd variable quantity.Preferably, the 3rd variable quantity is made as 0.5% of current controlled quentity controlled variable.
This specific embodiment carries out after flow-control belt conveyer scale M51 in conjunction with increment correction algorithm on the basis of bound control algolithm, and perfuming flow improves significantly, and fluctuation becomes steadily, controls flowed fluctuation in ± 1 l/h, can reach technological requirement.
In the system shown in Fig. 1, utilize this specific embodiment to carry out experimental verification, by M51 belt conveyer scale flow set, be 600kg/h, when M51 belt conveyer scale real time execution frequency surpasses upper limiting frequency value, the current controlled quentity controlled variable of M51 belt conveyer scale is reduced to 10kg/h, when M51 belt conveyer scale real time execution frequency is during lower than lower frequency limit value, the current controlled quentity controlled variable of M51 belt conveyer scale is increased to 10kg/h; In this simultaneously, the running frequency of M51 belt conveyer scale was detected in every 10 seconds, the running frequency sampling with respect to the last time when this running frequency sampling of M51 belt conveyer scale rises, the current controlled quentity controlled variable of M51 belt conveyer scale is reduced to 2kg/h, if decline, the current controlled quentity controlled variable of M51 belt conveyer scale is increased to 2kg/h.In experimentation, M51 belt conveyer scale perfuming traffic trends figure is as shown in 7 and 8, wherein Fig. 7 is the front perfuming flow schematic diagram of transformation, from the perfuming flow curve of Fig. 7 elliptic region, can find out, swollen silk perfuming flow fluctuates within the scope of 12～16 ls/h, flowed 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, from the perfuming flow curve of Fig. 8 elliptic region, can find out, perfuming flowed fluctuation is greatly mild, perfuming flow changes within the scope of 13～15 ls/h, reaches ± 1 l/h of technological requirement.
In the present invention, PLC can also be usingd the M32 conveyer belt shown in Fig. 1 as control object, and the supplied materials flow of setting M51 belt conveyer scale is a steady state value, controls the speed of M32 conveyer 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 flow chart of this specific embodiment, in the present embodiment, PLC be take conveyer belt as control object.Referring to 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 conveyer belt M32 as control object, and concrete steps are:
Step S201. detects whether belt conveyer scale M51 is initial start, if then the current controlled quentity controlled variable using initial controlled quentity controlled variable as conveyer belt M32 performs step S202, otherwise directly perform step S202; Wherein the initial controlled quentity controlled variable at this place arranges corresponding to conveyer belt M32, can set according to priori;
Step S202. detects the running frequency of belt conveyer scale M51;
Step S203. judges that whether the running frequency of belt conveyer scale M51 surpasses higher limit, if the current controlled quentity controlled variable of conveyer belt M32 as control object is adjusted into 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 the current controlled quentity controlled variable of conveyer belt M32 as control object is adjusted into the second controlled quentity controlled variable, then returns to step S201, otherwise returns to step S201.
In specific implementation process, in step S203 and S204, according to control object conveyer belt M32, preset upper limiting frequency value and the lower frequency limit value of belt conveyer scale M51 running frequency, when conveyer belt M32 is carried out to flow-control, according to real-time running frequency value and upper limiting frequency value, lower frequency limit value is adjusted the current controlled quentity controlled variable of skin conveyer belt, wherein, when control object is conveyer belt M32, the higher limit of the belt conveyer scale M51 running frequency that it is corresponding is for surpassing the frequency values of capping frequency values 45Hz, the lower limit of the belt conveyer scale M51 running frequency that it is corresponding is lower than the frequency values of setting lower frequency limit value 45Hz.When belt conveyer scale M51 real time execution frequency surpasses upper limiting frequency value 45Hz, just the current controlled quentity controlled variable of conveyer belt M32 is adjusted into the first controlled quentity controlled variable, when belt conveyer scale M51 real time execution frequency is during lower than lower frequency limit value 45Hz, just the current controlled quentity controlled variable of conveyer belt M32 is adjusted into the second controlled quentity controlled variable.
In specific implementation process, the current frequency values that is conveyer belt as the corresponding current controlled quentity controlled variable of conveyer belt M32 of control object, the first controlled quentity controlled variable of its correspondence is for to increase the resulting frequency values of the second variable quantity by current controlled quentity controlled variable, and the second controlled quentity controlled variable of its correspondence is for to reduce the resulting frequency values of the second variable quantity by current controlled quentity controlled variable.In a most preferred embodiment, the second variable quantity is made as 2% of current controlled quentity controlled variable.
The PLC of this specific embodiment utilizes bound control algolithm to carry out making the upper flow of tobacco of belt conveyer scale M51 steadily front with respect to transformation after flow-control to the conveyer belt M32 as control object.As shown in figure 10, in order further to improve and to control effect, on the basis of bound control algolithm, also by increment correction algorithm, conveyer belt M32 is carried out to flow-control, concrete steps are as follows:
Step S205. detected the running frequency of belt conveyer scale M51 according to the default sampling time, then performed step S206;
The belt conveyer scale M51 running frequency that step S206. samples this compares with the belt conveyer scale M51 running frequency that last sampling obtains, if belt conveyer scale M51 running frequency rises, the current controlled quentity controlled variable of the conveyer belt M32 as control object is adjusted into the 3rd controlled quentity controlled variable, if belt conveyer scale M51 running frequency declines, the current controlled quentity controlled variable of the conveyer belt M32 as control object is adjusted into the 4th controlled quentity controlled variable.
In step S205, the default sampling time can be set according to priori, generally can be set as 10 seconds, also can be worth for other.
In step S206, as the 3rd controlled quentity controlled variable corresponding to the conveyer belt of control object, can be made as current controlled quentity controlled variable increases the resulting value of the 4th variable quantity, and the 4th controlled quentity controlled variable of its correspondence can be made as current controlled quentity controlled variable and reduce the resulting value of the 4th variable quantity.
This specific embodiment carries out flow-control in conjunction with increment correction algorithm on the basis of bound control algolithm, it is steady state value by belt conveyer scale M51 flow set, utilize the frequency feedback of belt conveyer scale M51 to control conveyer belt M32 speed, finally reached the object of constant current perfuming.
In the system shown in Fig. 1, utilize this specific embodiment to carry out experimental verification, by M51 belt conveyer scale flow set, be 660kg/h, the initial controlled quentity controlled variable of M32 conveyer belt is set to 30Hz, when M51 belt conveyer scale real time execution frequency surpasses upper limiting frequency value 45Hz, the current controlled quentity controlled variable of M32 conveyer belt is increased to 2Hz, when M51 belt conveyer scale real time execution frequency is during lower than lower frequency limit value 45Hz, the current controlled quentity controlled variable of M32 conveyer belt is reduced to 2Hz; In this simultaneously, the running frequency of M51 belt conveyer scale was detected in every 10 seconds, the running frequency sampling with respect to the last time when this running frequency sampling of M51 belt conveyer scale rises, and the current controlled quentity controlled variable of M32 conveyer belt is increased to 1Hz, if decline, the current controlled quentity controlled variable of M32 conveyer belt is reduced to 1Hz.In experimentation, M51 belt conveyer scale perfuming data are as shown in table 1 below:
Table 1
| Sequence number | Date | Batch | Maximum stream flow (l/h) | Minimum discharge (l/h) | Flowed 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 | The 3rd day | 91-3761 | 13．2 | 13．0 | ±0.10 |
| 6 | The 3rd day | 93-6786 | 13．3 | 13．0 | ±0.15 |
| 7 | The 4th day | 91-3762 | 13．4 | 13．0 | ±0.20 |
| 8 | The 4th day | 93-6787 | 13．3 | 13．1 | ±0.10 |
| 9 | The 5th day | 93-6788 | 13．3 | 13．1 | ±0.10 |
| 10 | The 5th day | 91-3764 | 13．4 | 13．1 | ±0.15 |
As shown in figure 11, for system shown in Figure 1 is applied 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 is not fluctuation, from originally fluctuating at the level and smooth straight line of ± 0.2 l/h of scope after the curve of 12-16 l/h of scope frequent fluctuation becomes transformation, contrast Fig. 7 transforms front perfuming traffic trends curve, perfuming is effect improved fairly obvious, the target that exceeds the reach ± 1 l/h of technological requirement setting, simultaneously because flow of tobacco is stable, also improved the effect of pipe tobacco moisture regain, after moisture regain, moisture content has also improved 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 arrange and adjust 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 also giving all embodiments.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in the protection domain of the claims in the present invention.
Claims (10)
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 the current controlled quentity controlled variable using initial controlled quentity controlled variable as control object performs step S2, otherwise directly performs step S2;
Step S2. detects the running frequency of belt conveyer scale;
Step S3. judges that whether the running frequency of belt conveyer scale surpasses higher limit, if the current controlled quentity controlled variable of control object is adjusted into the first controlled quentity controlled variable, and performs step S4, otherwise directly performs step S4;
Step S4. judges that the running frequency of belt conveyer scale, whether lower than lower limit, if the current controlled quentity controlled variable of control object is adjusted into the second controlled quentity controlled variable, then returns to step S1, otherwise returns to step S1;
Wherein, described control object is belt conveyer scale or conveyer belt.
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 value of the supplied materials per hour on belt conveyer scale, the first controlled quentity controlled variable of its correspondence is for to reduce the resulting value of the first variable quantity by current controlled quentity controlled variable, and the second controlled quentity controlled variable of its correspondence is for to increase the resulting value of the first variable quantity by current controlled quentity controlled variable.
3. expanded cut tobacco perfuming flow control methods according to claim 2, is characterized in that, described the first variable quantity is made as 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 conveyer belt, the current frequency values that the current controlled quentity controlled variable of its correspondence is conveyer belt, the first controlled quentity controlled variable of its correspondence is for to increase the resulting frequency values of the second variable quantity by current controlled quentity controlled variable, and the second controlled quentity controlled variable of its correspondence is for to reduce the resulting frequency values of the second variable quantity by current controlled quentity controlled variable.
5. expanded cut tobacco perfuming flow control methods according to claim 4, is characterized in that, described the second variable quantity is made as 2% of current controlled quentity controlled variable.
6. according to the expanded cut tobacco perfuming flow control methods described in claim 1 to 5 any one, it is characterized in that, described method also comprises that PLC utilizes increment correction algorithm to carry out flow-control to control object, and concrete steps are:
Step S5. detected the running frequency of belt conveyer scale according to the default sampling time, then performed step S6;
The belt conveyer scale running frequency that step S6. samples this compares with the belt conveyer scale running frequency that last sampling obtains, if belt conveyer scale running frequency rises, the current controlled quentity controlled variable of control object is adjusted into the 3rd controlled quentity controlled variable, if belt conveyer scale running frequency declines, the current controlled quentity controlled variable of control object is adjusted into the 4th controlled quentity controlled variable.
7. expanded cut tobacco perfuming flow control methods according to claim 6, is characterized in that, the described default sampling time is 10 seconds.
8. expanded cut tobacco perfuming flow control methods according to claim 6, it is characterized in that, when control object is belt conveyer scale, the 3rd controlled quentity controlled variable of its correspondence is that current controlled quentity controlled variable reduces the resulting value of the 3rd variable quantity, and the 4th controlled quentity controlled variable of its correspondence is that current controlled quentity controlled variable increases the resulting value of the 3rd variable quantity.
9. expanded cut tobacco perfuming flow control methods according to claim 8, is characterized in that, described the 3rd variable quantity is made as 0.5% of current controlled quentity controlled variable.
10. expanded cut tobacco perfuming flow control methods according to claim 6, it is characterized in that, when control object is conveyer belt, the 3rd controlled quentity controlled variable of its correspondence is that current controlled quentity controlled variable increases the resulting value of the 4th variable quantity, and the 4th controlled quentity controlled variable of its correspondence is that current controlled quentity controlled variable reduces the resulting value of the 4th variable quantity.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105836420A (en) * | 2016-06-17 | 2016-08-10 | 山东中烟工业有限责任公司 | Control device and control method for appropriate feeding and discontinuity prevention of tobacco storehouse type feeding machine |
| CN111580481A (en) * | 2020-05-21 | 2020-08-25 | 四川中烟工业有限责任公司 | Method for improving accumulated precision of cut stem blending |
| CN112722763A (en) * | 2020-12-18 | 2021-04-30 | 山东中烟工业有限责任公司 | Automatic adaptive control system and method for flow after air supply |
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